axmol/thirdparty/openal/al/source.cpp

/**
 * OpenAL cross platform audio library
 * Copyright (C) 1999-2007 by authors.
 * This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the
 *  Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 * Or go to http://www.gnu.org/copyleft/lgpl.html
 */

#include "config.h"

#include "source.h"

#include <algorithm>
#include <array>
#include <atomic>
#include <cassert>
#include <chrono>
#include <cinttypes>
#include <climits>
#include <cmath>
#include <cstdint>
#include <functional>
#include <iterator>
#include <limits>
#include <memory>
#include <mutex>
#include <new>
#include <numeric>
#include <optional>
#include <stdexcept>
#include <thread>
#include <utility>
#include <vector>

#include "AL/al.h"
#include "AL/alc.h"
#include "AL/alext.h"
#include "AL/efx.h"

#include "albit.h"
#include "alc/alu.h"
#include "alc/backends/base.h"
#include "alc/context.h"
#include "alc/device.h"
#include "alc/inprogext.h"
#include "almalloc.h"
#include "alnumeric.h"
#include "alspan.h"
#include "atomic.h"
#include "auxeffectslot.h"
#include "buffer.h"
#include "core/ambidefs.h"
#include "core/bformatdec.h"
#include "core/except.h"
#include "core/filters/nfc.h"
#include "core/filters/splitter.h"
#include "core/logging.h"
#include "core/voice_change.h"
#include "direct_defs.h"
#include "event.h"
#include "filter.h"
#include "opthelpers.h"
#include "ringbuffer.h"

#ifdef ALSOFT_EAX
#include <cassert>
#endif // ALSOFT_EAX

bool sBufferSubDataCompat{false};

namespace {

using namespace std::placeholders;
using std::chrono::nanoseconds;
using seconds_d = std::chrono::duration<double>;

Voice *GetSourceVoice(ALsource *source, ALCcontext *context)
{
    auto voicelist = context->getVoicesSpan();
    ALuint idx{source->VoiceIdx};
    if(idx < voicelist.size())
    {
        ALuint sid{source->id};
        Voice *voice = voicelist[idx];
        if(voice->mSourceID.load(std::memory_order_acquire) == sid)
            return voice;
    }
    source->VoiceIdx = INVALID_VOICE_IDX;
    return nullptr;
}


void UpdateSourceProps(const ALsource *source, Voice *voice, ALCcontext *context)
{
    /* Get an unused property container, or allocate a new one as needed. */
    VoicePropsItem *props{context->mFreeVoiceProps.load(std::memory_order_acquire)};
    if(!props)
    {
        context->allocVoiceProps();
        props = context->mFreeVoiceProps.load(std::memory_order_acquire);
    }
    VoicePropsItem *next;
    do {
        next = props->next.load(std::memory_order_relaxed);
    } while(context->mFreeVoiceProps.compare_exchange_weak(props, next,
        std::memory_order_acq_rel, std::memory_order_acquire) == false);

    props->Pitch = source->Pitch;
    props->Gain = source->Gain;
    props->OuterGain = source->OuterGain;
    props->MinGain = source->MinGain;
    props->MaxGain = source->MaxGain;
    props->InnerAngle = source->InnerAngle;
    props->OuterAngle = source->OuterAngle;
    props->RefDistance = source->RefDistance;
    props->MaxDistance = source->MaxDistance;
    props->RolloffFactor = source->RolloffFactor
#ifdef ALSOFT_EAX
        + source->RolloffFactor2
#endif
    ;
    props->Position = source->Position;
    props->Velocity = source->Velocity;
    props->Direction = source->Direction;
    props->OrientAt = source->OrientAt;
    props->OrientUp = source->OrientUp;
    props->HeadRelative = source->HeadRelative;
    props->mDistanceModel = source->mDistanceModel;
    props->mResampler = source->mResampler;
    props->DirectChannels = source->DirectChannels;
    props->mSpatializeMode = source->mSpatialize;

    props->DryGainHFAuto = source->DryGainHFAuto;
    props->WetGainAuto = source->WetGainAuto;
    props->WetGainHFAuto = source->WetGainHFAuto;
    props->OuterGainHF = source->OuterGainHF;

    props->AirAbsorptionFactor = source->AirAbsorptionFactor;
    props->RoomRolloffFactor = source->RoomRolloffFactor;
    props->DopplerFactor = source->DopplerFactor;

    props->StereoPan = source->StereoPan;

    props->Radius = source->Radius;
    props->EnhWidth = source->EnhWidth;

    props->Direct.Gain = source->Direct.Gain;
    props->Direct.GainHF = source->Direct.GainHF;
    props->Direct.HFReference = source->Direct.HFReference;
    props->Direct.GainLF = source->Direct.GainLF;
    props->Direct.LFReference = source->Direct.LFReference;

    auto copy_send = [](const ALsource::SendData &srcsend) noexcept -> VoiceProps::SendData
    {
        VoiceProps::SendData ret{};
        ret.Slot = srcsend.Slot ? srcsend.Slot->mSlot : nullptr;
        ret.Gain = srcsend.Gain;
        ret.GainHF = srcsend.GainHF;
        ret.HFReference = srcsend.HFReference;
        ret.GainLF = srcsend.GainLF;
        ret.LFReference = srcsend.LFReference;
        return ret;
    };
    std::transform(source->Send.cbegin(), source->Send.cend(), props->Send, copy_send);
    if(!props->Send[0].Slot && context->mDefaultSlot)
        props->Send[0].Slot = context->mDefaultSlot->mSlot;

    /* Set the new container for updating internal parameters. */
    props = voice->mUpdate.exchange(props, std::memory_order_acq_rel);
    if(props)
    {
        /* If there was an unused update container, put it back in the
         * freelist.
         */
        AtomicReplaceHead(context->mFreeVoiceProps, props);
    }
}

/* GetSourceSampleOffset
 *
 * Gets the current read offset for the given Source, in 32.32 fixed-point
 * samples. The offset is relative to the start of the queue (not the start of
 * the current buffer).
 */
int64_t GetSourceSampleOffset(ALsource *Source, ALCcontext *context, nanoseconds *clocktime)
{
    ALCdevice *device{context->mALDevice.get()};
    const VoiceBufferItem *Current{};
    int64_t readPos{};
    uint refcount{};
    Voice *voice{};

    do {
        refcount = device->waitForMix();
        *clocktime = GetDeviceClockTime(device);
        voice = GetSourceVoice(Source, context);
        if(voice)
        {
            Current = voice->mCurrentBuffer.load(std::memory_order_relaxed);

            readPos  = int64_t{voice->mPosition.load(std::memory_order_relaxed)} << MixerFracBits;
            readPos += voice->mPositionFrac.load(std::memory_order_relaxed);
        }
        std::atomic_thread_fence(std::memory_order_acquire);
    } while(refcount != device->MixCount.load(std::memory_order_relaxed));

    if(!voice)
        return 0;

    for(auto &item : Source->mQueue)
    {
        if(&item == Current) break;
        readPos += int64_t{item.mSampleLen} << MixerFracBits;
    }
    if(readPos > std::numeric_limits<int64_t>::max() >> (32-MixerFracBits))
        return std::numeric_limits<int64_t>::max();
    return readPos << (32-MixerFracBits);
}

/* GetSourceSecOffset
 *
 * Gets the current read offset for the given Source, in seconds. The offset is
 * relative to the start of the queue (not the start of the current buffer).
 */
double GetSourceSecOffset(ALsource *Source, ALCcontext *context, nanoseconds *clocktime)
{
    ALCdevice *device{context->mALDevice.get()};
    const VoiceBufferItem *Current{};
    int64_t readPos{};
    uint refcount{};
    Voice *voice{};

    do {
        refcount = device->waitForMix();
        *clocktime = GetDeviceClockTime(device);
        voice = GetSourceVoice(Source, context);
        if(voice)
        {
            Current = voice->mCurrentBuffer.load(std::memory_order_relaxed);

            readPos  = int64_t{voice->mPosition.load(std::memory_order_relaxed)} << MixerFracBits;
            readPos += voice->mPositionFrac.load(std::memory_order_relaxed);
        }
        std::atomic_thread_fence(std::memory_order_acquire);
    } while(refcount != device->MixCount.load(std::memory_order_relaxed));

    if(!voice)
        return 0.0f;

    const ALbuffer *BufferFmt{nullptr};
    auto BufferList = Source->mQueue.cbegin();
    while(BufferList != Source->mQueue.cend() && al::to_address(BufferList) != Current)
    {
        if(!BufferFmt) BufferFmt = BufferList->mBuffer;
        readPos += int64_t{BufferList->mSampleLen} << MixerFracBits;
        ++BufferList;
    }
    while(BufferList != Source->mQueue.cend() && !BufferFmt)
    {
        BufferFmt = BufferList->mBuffer;
        ++BufferList;
    }
    ASSUME(BufferFmt != nullptr);

    return static_cast<double>(readPos) / double{MixerFracOne} / BufferFmt->mSampleRate;
}

/* GetSourceOffset
 *
 * Gets the current read offset for the given Source, in the appropriate format
 * (Bytes, Samples or Seconds). The offset is relative to the start of the
 * queue (not the start of the current buffer).
 */
template<typename T>
T GetSourceOffset(ALsource *Source, ALenum name, ALCcontext *context)
{
    ALCdevice *device{context->mALDevice.get()};
    const VoiceBufferItem *Current{};
    int64_t readPos{};
    uint readPosFrac{};
    uint refcount;
    Voice *voice;

    do {
        refcount = device->waitForMix();
        voice = GetSourceVoice(Source, context);
        if(voice)
        {
            Current = voice->mCurrentBuffer.load(std::memory_order_relaxed);

            readPos = voice->mPosition.load(std::memory_order_relaxed);
            readPosFrac = voice->mPositionFrac.load(std::memory_order_relaxed);
        }
        std::atomic_thread_fence(std::memory_order_acquire);
    } while(refcount != device->MixCount.load(std::memory_order_relaxed));

    if(!voice)
        return T{0};

    const ALbuffer *BufferFmt{nullptr};
    auto BufferList = Source->mQueue.cbegin();
    while(BufferList != Source->mQueue.cend() && al::to_address(BufferList) != Current)
    {
        if(!BufferFmt) BufferFmt = BufferList->mBuffer;
        readPos += BufferList->mSampleLen;
        ++BufferList;
    }
    while(BufferList != Source->mQueue.cend() && !BufferFmt)
    {
        BufferFmt = BufferList->mBuffer;
        ++BufferList;
    }
    ASSUME(BufferFmt != nullptr);

    T offset{};
    switch(name)
    {
    case AL_SEC_OFFSET:
        if constexpr(std::is_floating_point_v<T>)
        {
            offset  = static_cast<T>(readPos) + static_cast<T>(readPosFrac)/T{MixerFracOne};
            offset /= static_cast<T>(BufferFmt->mSampleRate);
        }
        else
        {
            readPos /= BufferFmt->mSampleRate;
            offset = static_cast<T>(clampi64(readPos, std::numeric_limits<T>::min(),
                std::numeric_limits<T>::max()));
        }
        break;

    case AL_SAMPLE_OFFSET:
        if constexpr(std::is_floating_point_v<T>)
            offset = static_cast<T>(readPos) + static_cast<T>(readPosFrac)/T{MixerFracOne};
        else
            offset = static_cast<T>(clampi64(readPos, std::numeric_limits<T>::min(),
                std::numeric_limits<T>::max()));
        break;

    case AL_BYTE_OFFSET:
        const ALuint BlockSamples{BufferFmt->mBlockAlign};
        const ALuint BlockSize{BufferFmt->blockSizeFromFmt()};
        /* Round down to the block boundary. */
        readPos = readPos / BlockSamples * BlockSize;

        if constexpr(std::is_floating_point_v<T>)
            offset = static_cast<T>(readPos);
        else
        {
            if(readPos > std::numeric_limits<T>::max())
                offset = RoundDown(std::numeric_limits<T>::max(), static_cast<T>(BlockSize));
            else if(readPos < std::numeric_limits<T>::min())
                offset = RoundUp(std::numeric_limits<T>::min(), static_cast<T>(BlockSize));
            else
                offset = static_cast<T>(readPos);
        }
        break;
    }
    return offset;
}

/* GetSourceLength
 *
 * Gets the length of the given Source's buffer queue, in the appropriate
 * format (Bytes, Samples or Seconds).
 */
template<typename T>
T GetSourceLength(const ALsource *source, ALenum name)
{
    uint64_t length{0};
    const ALbuffer *BufferFmt{nullptr};
    for(auto &listitem : source->mQueue)
    {
        if(!BufferFmt)
            BufferFmt = listitem.mBuffer;
        length += listitem.mSampleLen;
    }
    if(length == 0)
        return T{0};

    ASSUME(BufferFmt != nullptr);
    switch(name)
    {
    case AL_SEC_LENGTH_SOFT:
        if constexpr(std::is_floating_point_v<T>)
            return static_cast<T>(length) / static_cast<T>(BufferFmt->mSampleRate);
        else
            return static_cast<T>(minu64(length/BufferFmt->mSampleRate,
                std::numeric_limits<T>::max()));

    case AL_SAMPLE_LENGTH_SOFT:
        if constexpr(std::is_floating_point_v<T>)
            return static_cast<T>(length);
        else
            return static_cast<T>(minu64(length, std::numeric_limits<T>::max()));

    case AL_BYTE_LENGTH_SOFT:
        const ALuint BlockSamples{BufferFmt->mBlockAlign};
        const ALuint BlockSize{BufferFmt->blockSizeFromFmt()};
        /* Round down to the block boundary. */
        length = length / BlockSamples * BlockSize;

        if constexpr(std::is_floating_point_v<T>)
            return static_cast<T>(length);
        else
        {
            if(length > std::numeric_limits<T>::max())
                return RoundDown(std::numeric_limits<T>::max(), static_cast<T>(BlockSize));
            return static_cast<T>(length);
        }
    }
    return T{0};
}


struct VoicePos {
    int pos;
    uint frac;
    ALbufferQueueItem *bufferitem;
};

/**
 * GetSampleOffset
 *
 * Retrieves the voice position, fixed-point fraction, and bufferlist item
 * using the given offset type and offset. If the offset is out of range,
 * returns an empty optional.
 */
std::optional<VoicePos> GetSampleOffset(al::deque<ALbufferQueueItem> &BufferList,
    ALenum OffsetType, double Offset)
{
    /* Find the first valid Buffer in the Queue */
    const ALbuffer *BufferFmt{nullptr};
    for(auto &item : BufferList)
    {
        BufferFmt = item.mBuffer;
        if(BufferFmt) break;
    }
    if(!BufferFmt) UNLIKELY
        return std::nullopt;

    /* Get sample frame offset */
    int64_t offset{};
    uint frac{};
    double dbloff, dblfrac;
    switch(OffsetType)
    {
    case AL_SEC_OFFSET:
        dblfrac = std::modf(Offset*BufferFmt->mSampleRate, &dbloff);
        if(dblfrac < 0.0)
        {
            /* If there's a negative fraction, reduce the offset to "floor" it,
             * and convert the fraction to a percentage to the next value (e.g.
             * -2.75 -> -3 + 0.25).
             */
            dbloff -= 1.0;
            dblfrac += 1.0;
        }
        offset = static_cast<int64_t>(dbloff);
        frac = static_cast<uint>(mind(dblfrac*MixerFracOne, MixerFracOne-1.0));
        break;

    case AL_SAMPLE_OFFSET:
        dblfrac = std::modf(Offset, &dbloff);
        if(dblfrac < 0.0)
        {
            dbloff -= 1.0;
            dblfrac += 1.0;
        }
        offset = static_cast<int64_t>(dbloff);
        frac = static_cast<uint>(mind(dblfrac*MixerFracOne, MixerFracOne-1.0));
        break;

    case AL_BYTE_OFFSET:
        /* Determine the ByteOffset (and ensure it is block aligned) */
        Offset = std::floor(Offset / BufferFmt->blockSizeFromFmt());
        offset = static_cast<int64_t>(Offset) * BufferFmt->mBlockAlign;
        frac = 0;
        break;
    }

    /* Find the bufferlist item this offset belongs to. */
    if(offset < 0)
    {
        if(offset < std::numeric_limits<int>::min())
            return std::nullopt;
        return VoicePos{static_cast<int>(offset), frac, &BufferList.front()};
    }

    if(BufferFmt->mCallback)
        return std::nullopt;

    int64_t totalBufferLen{0};
    for(auto &item : BufferList)
    {
        if(totalBufferLen > offset)
            break;
        if(item.mSampleLen > offset-totalBufferLen)
        {
            /* Offset is in this buffer */
            return VoicePos{static_cast<int>(offset-totalBufferLen), frac, &item};
        }
        totalBufferLen += item.mSampleLen;
    }

    /* Offset is out of range of the queue */
    return std::nullopt;
}


void InitVoice(Voice *voice, ALsource *source, ALbufferQueueItem *BufferList, ALCcontext *context,
    ALCdevice *device)
{
    voice->mLoopBuffer.store(source->Looping ? &source->mQueue.front() : nullptr,
        std::memory_order_relaxed);

    ALbuffer *buffer{BufferList->mBuffer};
    voice->mFrequency = buffer->mSampleRate;
    voice->mFmtChannels =
        (buffer->mChannels == FmtStereo && source->mStereoMode == SourceStereo::Enhanced) ?
        FmtSuperStereo : buffer->mChannels;
    voice->mFmtType = buffer->mType;
    voice->mFrameStep = buffer->channelsFromFmt();
    voice->mBytesPerBlock = buffer->blockSizeFromFmt();
    voice->mSamplesPerBlock = buffer->mBlockAlign;
    voice->mAmbiLayout = IsUHJ(voice->mFmtChannels) ? AmbiLayout::FuMa : buffer->mAmbiLayout;
    voice->mAmbiScaling = IsUHJ(voice->mFmtChannels) ? AmbiScaling::UHJ : buffer->mAmbiScaling;
    voice->mAmbiOrder = (voice->mFmtChannels == FmtSuperStereo) ? 1 : buffer->mAmbiOrder;

    if(buffer->mCallback) voice->mFlags.set(VoiceIsCallback);
    else if(source->SourceType == AL_STATIC) voice->mFlags.set(VoiceIsStatic);
    voice->mNumCallbackBlocks = 0;
    voice->mCallbackBlockBase = 0;

    voice->prepare(device);

    source->mPropsDirty = false;
    UpdateSourceProps(source, voice, context);

    voice->mSourceID.store(source->id, std::memory_order_release);
}


VoiceChange *GetVoiceChanger(ALCcontext *ctx)
{
    VoiceChange *vchg{ctx->mVoiceChangeTail};
    if(vchg == ctx->mCurrentVoiceChange.load(std::memory_order_acquire)) UNLIKELY
    {
        ctx->allocVoiceChanges();
        vchg = ctx->mVoiceChangeTail;
    }

    ctx->mVoiceChangeTail = vchg->mNext.exchange(nullptr, std::memory_order_relaxed);

    return vchg;
}

void SendVoiceChanges(ALCcontext *ctx, VoiceChange *tail)
{
    ALCdevice *device{ctx->mALDevice.get()};

    VoiceChange *oldhead{ctx->mCurrentVoiceChange.load(std::memory_order_acquire)};
    while(VoiceChange *next{oldhead->mNext.load(std::memory_order_relaxed)})
        oldhead = next;
    oldhead->mNext.store(tail, std::memory_order_release);

    const bool connected{device->Connected.load(std::memory_order_acquire)};
    device->waitForMix();
    if(!connected) UNLIKELY
    {
        if(ctx->mStopVoicesOnDisconnect.load(std::memory_order_acquire))
        {
            /* If the device is disconnected and voices are stopped, just
             * ignore all pending changes.
             */
            VoiceChange *cur{ctx->mCurrentVoiceChange.load(std::memory_order_acquire)};
            while(VoiceChange *next{cur->mNext.load(std::memory_order_acquire)})
            {
                cur = next;
                if(Voice *voice{cur->mVoice})
                    voice->mSourceID.store(0, std::memory_order_relaxed);
            }
            ctx->mCurrentVoiceChange.store(cur, std::memory_order_release);
        }
    }
}


bool SetVoiceOffset(Voice *oldvoice, const VoicePos &vpos, ALsource *source, ALCcontext *context,
    ALCdevice *device)
{
    /* First, get a free voice to start at the new offset. */
    auto voicelist = context->getVoicesSpan();
    Voice *newvoice{};
    ALuint vidx{0};
    for(Voice *voice : voicelist)
    {
        if(voice->mPlayState.load(std::memory_order_acquire) == Voice::Stopped
            && voice->mSourceID.load(std::memory_order_relaxed) == 0u
            && voice->mPendingChange.load(std::memory_order_relaxed) == false)
        {
            newvoice = voice;
            break;
        }
        ++vidx;
    }
    if(!newvoice) UNLIKELY
    {
        auto &allvoices = *context->mVoices.load(std::memory_order_relaxed);
        if(allvoices.size() == voicelist.size())
            context->allocVoices(1);
        context->mActiveVoiceCount.fetch_add(1, std::memory_order_release);
        voicelist = context->getVoicesSpan();

        vidx = 0;
        for(Voice *voice : voicelist)
        {
            if(voice->mPlayState.load(std::memory_order_acquire) == Voice::Stopped
                && voice->mSourceID.load(std::memory_order_relaxed) == 0u
                && voice->mPendingChange.load(std::memory_order_relaxed) == false)
            {
                newvoice = voice;
                break;
            }
            ++vidx;
        }
        ASSUME(newvoice != nullptr);
    }

    /* Initialize the new voice and set its starting offset.
     * TODO: It might be better to have the VoiceChange processing copy the old
     * voice's mixing parameters (and pending update) insead of initializing it
     * all here. This would just need to set the minimum properties to link the
     * voice to the source and its position-dependent properties (including the
     * fading flag).
     */
    newvoice->mPlayState.store(Voice::Pending, std::memory_order_relaxed);
    newvoice->mPosition.store(vpos.pos, std::memory_order_relaxed);
    newvoice->mPositionFrac.store(vpos.frac, std::memory_order_relaxed);
    newvoice->mCurrentBuffer.store(vpos.bufferitem, std::memory_order_relaxed);
    newvoice->mStartTime = oldvoice->mStartTime;
    newvoice->mFlags.reset();
    if(vpos.pos > 0 || (vpos.pos == 0 && vpos.frac > 0)
        || vpos.bufferitem != &source->mQueue.front())
        newvoice->mFlags.set(VoiceIsFading);
    InitVoice(newvoice, source, vpos.bufferitem, context, device);
    source->VoiceIdx = vidx;

    /* Set the old voice as having a pending change, and send it off with the
     * new one with a new offset voice change.
     */
    oldvoice->mPendingChange.store(true, std::memory_order_relaxed);

    VoiceChange *vchg{GetVoiceChanger(context)};
    vchg->mOldVoice = oldvoice;
    vchg->mVoice = newvoice;
    vchg->mSourceID = source->id;
    vchg->mState = VChangeState::Restart;
    SendVoiceChanges(context, vchg);

    /* If the old voice still has a sourceID, it's still active and the change-
     * over will work on the next update.
     */
    if(oldvoice->mSourceID.load(std::memory_order_acquire) != 0u) LIKELY
        return true;

    /* Otherwise, if the new voice's state is not pending, the change-over
     * already happened.
     */
    if(newvoice->mPlayState.load(std::memory_order_acquire) != Voice::Pending)
        return true;

    /* Otherwise, wait for any current mix to finish and check one last time. */
    device->waitForMix();
    if(newvoice->mPlayState.load(std::memory_order_acquire) != Voice::Pending)
        return true;
    /* The change-over failed because the old voice stopped before the new
     * voice could start at the new offset. Let go of the new voice and have
     * the caller store the source offset since it's stopped.
     */
    newvoice->mCurrentBuffer.store(nullptr, std::memory_order_relaxed);
    newvoice->mLoopBuffer.store(nullptr, std::memory_order_relaxed);
    newvoice->mSourceID.store(0u, std::memory_order_relaxed);
    newvoice->mPlayState.store(Voice::Stopped, std::memory_order_relaxed);
    return false;
}


/**
 * Returns if the last known state for the source was playing or paused. Does
 * not sync with the mixer voice.
 */
inline bool IsPlayingOrPaused(ALsource *source)
{ return source->state == AL_PLAYING || source->state == AL_PAUSED; }

/**
 * Returns an updated source state using the matching voice's status (or lack
 * thereof).
 */
inline ALenum GetSourceState(ALsource *source, Voice *voice)
{
    if(!voice && source->state == AL_PLAYING)
        source->state = AL_STOPPED;
    return source->state;
}


bool EnsureSources(ALCcontext *context, size_t needed)
{
    size_t count{std::accumulate(context->mSourceList.cbegin(), context->mSourceList.cend(), 0_uz,
        [](size_t cur, const SourceSubList &sublist) noexcept -> size_t
        { return cur + static_cast<ALuint>(al::popcount(sublist.FreeMask)); })};

    while(needed > count)
    {
        if(context->mSourceList.size() >= 1<<25) UNLIKELY
            return false;

        context->mSourceList.emplace_back();
        auto sublist = context->mSourceList.end() - 1;
        sublist->FreeMask = ~0_u64;
        sublist->Sources = static_cast<ALsource*>(al_calloc(alignof(ALsource), sizeof(ALsource)*64));
        if(!sublist->Sources) UNLIKELY
        {
            context->mSourceList.pop_back();
            return false;
        }
        count += 64;
    }
    return true;
}

ALsource *AllocSource(ALCcontext *context)
{
    auto sublist = std::find_if(context->mSourceList.begin(), context->mSourceList.end(),
        [](const SourceSubList &entry) noexcept -> bool
        { return entry.FreeMask != 0; });
    auto lidx = static_cast<ALuint>(std::distance(context->mSourceList.begin(), sublist));
    auto slidx = static_cast<ALuint>(al::countr_zero(sublist->FreeMask));
    ASSUME(slidx < 64);

    ALsource *source{al::construct_at(sublist->Sources + slidx)};

    /* Add 1 to avoid source ID 0. */
    source->id = ((lidx<<6) | slidx) + 1;

    context->mNumSources += 1;
    sublist->FreeMask &= ~(1_u64 << slidx);

    return source;
}

void FreeSource(ALCcontext *context, ALsource *source)
{
    context->mSourceNames.erase(source->id);

    const ALuint id{source->id - 1};
    const size_t lidx{id >> 6};
    const ALuint slidx{id & 0x3f};

    if(Voice *voice{GetSourceVoice(source, context)})
    {
        VoiceChange *vchg{GetVoiceChanger(context)};

        voice->mPendingChange.store(true, std::memory_order_relaxed);
        vchg->mVoice = voice;
        vchg->mSourceID = source->id;
        vchg->mState = VChangeState::Stop;

        SendVoiceChanges(context, vchg);
    }

    std::destroy_at(source);

    context->mSourceList[lidx].FreeMask |= 1_u64 << slidx;
    context->mNumSources--;
}


inline ALsource *LookupSource(ALCcontext *context, ALuint id) noexcept
{
    const size_t lidx{(id-1) >> 6};
    const ALuint slidx{(id-1) & 0x3f};

    if(lidx >= context->mSourceList.size()) UNLIKELY
        return nullptr;
    SourceSubList &sublist{context->mSourceList[lidx]};
    if(sublist.FreeMask & (1_u64 << slidx)) UNLIKELY
        return nullptr;
    return sublist.Sources + slidx;
}

auto LookupBuffer = [](ALCdevice *device, auto id) noexcept -> ALbuffer*
{
    const auto lidx{(id-1) >> 6};
    const auto slidx{(id-1) & 0x3f};

    if(lidx >= device->BufferList.size()) UNLIKELY
        return nullptr;
    BufferSubList &sublist = device->BufferList[static_cast<size_t>(lidx)];
    if(sublist.FreeMask & (1_u64 << slidx)) UNLIKELY
        return nullptr;
    return sublist.Buffers + static_cast<size_t>(slidx);
};

auto LookupFilter = [](ALCdevice *device, auto id) noexcept -> ALfilter*
{
    const auto lidx{(id-1) >> 6};
    const auto slidx{(id-1) & 0x3f};

    if(lidx >= device->FilterList.size()) UNLIKELY
        return nullptr;
    FilterSubList &sublist = device->FilterList[static_cast<size_t>(lidx)];
    if(sublist.FreeMask & (1_u64 << slidx)) UNLIKELY
        return nullptr;
    return sublist.Filters + static_cast<size_t>(slidx);
};

auto LookupEffectSlot = [](ALCcontext *context, auto id) noexcept -> ALeffectslot*
{
    const auto lidx{(id-1) >> 6};
    const auto slidx{(id-1) & 0x3f};

    if(lidx >= context->mEffectSlotList.size()) UNLIKELY
        return nullptr;
    EffectSlotSubList &sublist{context->mEffectSlotList[static_cast<size_t>(lidx)]};
    if(sublist.FreeMask & (1_u64 << slidx)) UNLIKELY
        return nullptr;
    return sublist.EffectSlots + static_cast<size_t>(slidx);
};


auto StereoModeFromEnum = [](auto mode) noexcept -> std::optional<SourceStereo>
{
    switch(mode)
    {
    case AL_NORMAL_SOFT: return SourceStereo::Normal;
    case AL_SUPER_STEREO_SOFT: return SourceStereo::Enhanced;
    }
    return std::nullopt;
};
ALenum EnumFromStereoMode(SourceStereo mode)
{
    switch(mode)
    {
    case SourceStereo::Normal: return AL_NORMAL_SOFT;
    case SourceStereo::Enhanced: return AL_SUPER_STEREO_SOFT;
    }
    throw std::runtime_error{"Invalid SourceStereo: "+std::to_string(int(mode))};
}

auto SpatializeModeFromEnum = [](auto mode) noexcept -> std::optional<SpatializeMode>
{
    switch(mode)
    {
    case AL_FALSE: return SpatializeMode::Off;
    case AL_TRUE: return SpatializeMode::On;
    case AL_AUTO_SOFT: return SpatializeMode::Auto;
    }
    return std::nullopt;
};
ALenum EnumFromSpatializeMode(SpatializeMode mode)
{
    switch(mode)
    {
    case SpatializeMode::Off: return AL_FALSE;
    case SpatializeMode::On: return AL_TRUE;
    case SpatializeMode::Auto: return AL_AUTO_SOFT;
    }
    throw std::runtime_error{"Invalid SpatializeMode: "+std::to_string(int(mode))};
}

auto DirectModeFromEnum = [](auto mode) noexcept -> std::optional<DirectMode>
{
    switch(mode)
    {
    case AL_FALSE: return DirectMode::Off;
    case AL_DROP_UNMATCHED_SOFT: return DirectMode::DropMismatch;
    case AL_REMIX_UNMATCHED_SOFT: return DirectMode::RemixMismatch;
    }
    return std::nullopt;
};
ALenum EnumFromDirectMode(DirectMode mode)
{
    switch(mode)
    {
    case DirectMode::Off: return AL_FALSE;
    case DirectMode::DropMismatch: return AL_DROP_UNMATCHED_SOFT;
    case DirectMode::RemixMismatch: return AL_REMIX_UNMATCHED_SOFT;
    }
    throw std::runtime_error{"Invalid DirectMode: "+std::to_string(int(mode))};
}

auto DistanceModelFromALenum = [](auto model) noexcept -> std::optional<DistanceModel>
{
    switch(model)
    {
    case AL_NONE: return DistanceModel::Disable;
    case AL_INVERSE_DISTANCE: return DistanceModel::Inverse;
    case AL_INVERSE_DISTANCE_CLAMPED: return DistanceModel::InverseClamped;
    case AL_LINEAR_DISTANCE: return DistanceModel::Linear;
    case AL_LINEAR_DISTANCE_CLAMPED: return DistanceModel::LinearClamped;
    case AL_EXPONENT_DISTANCE: return DistanceModel::Exponent;
    case AL_EXPONENT_DISTANCE_CLAMPED: return DistanceModel::ExponentClamped;
    }
    return std::nullopt;
};
ALenum ALenumFromDistanceModel(DistanceModel model)
{
    switch(model)
    {
    case DistanceModel::Disable: return AL_NONE;
    case DistanceModel::Inverse: return AL_INVERSE_DISTANCE;
    case DistanceModel::InverseClamped: return AL_INVERSE_DISTANCE_CLAMPED;
    case DistanceModel::Linear: return AL_LINEAR_DISTANCE;
    case DistanceModel::LinearClamped: return AL_LINEAR_DISTANCE_CLAMPED;
    case DistanceModel::Exponent: return AL_EXPONENT_DISTANCE;
    case DistanceModel::ExponentClamped: return AL_EXPONENT_DISTANCE_CLAMPED;
    }
    throw std::runtime_error{"Unexpected distance model "+std::to_string(static_cast<int>(model))};
}

enum SourceProp : ALenum {
    srcPitch = AL_PITCH,
    srcGain = AL_GAIN,
    srcMinGain = AL_MIN_GAIN,
    srcMaxGain = AL_MAX_GAIN,
    srcMaxDistance = AL_MAX_DISTANCE,
    srcRolloffFactor = AL_ROLLOFF_FACTOR,
    srcDopplerFactor = AL_DOPPLER_FACTOR,
    srcConeOuterGain = AL_CONE_OUTER_GAIN,
    srcSecOffset = AL_SEC_OFFSET,
    srcSampleOffset = AL_SAMPLE_OFFSET,
    srcByteOffset = AL_BYTE_OFFSET,
    srcConeInnerAngle = AL_CONE_INNER_ANGLE,
    srcConeOuterAngle = AL_CONE_OUTER_ANGLE,
    srcRefDistance = AL_REFERENCE_DISTANCE,

    srcPosition = AL_POSITION,
    srcVelocity = AL_VELOCITY,
    srcDirection = AL_DIRECTION,

    srcSourceRelative = AL_SOURCE_RELATIVE,
    srcLooping = AL_LOOPING,
    srcBuffer = AL_BUFFER,
    srcSourceState = AL_SOURCE_STATE,
    srcBuffersQueued = AL_BUFFERS_QUEUED,
    srcBuffersProcessed = AL_BUFFERS_PROCESSED,
    srcSourceType = AL_SOURCE_TYPE,

    /* ALC_EXT_EFX */
    srcConeOuterGainHF = AL_CONE_OUTER_GAINHF,
    srcAirAbsorptionFactor = AL_AIR_ABSORPTION_FACTOR,
    srcRoomRolloffFactor =  AL_ROOM_ROLLOFF_FACTOR,
    srcDirectFilterGainHFAuto = AL_DIRECT_FILTER_GAINHF_AUTO,
    srcAuxSendFilterGainAuto = AL_AUXILIARY_SEND_FILTER_GAIN_AUTO,
    srcAuxSendFilterGainHFAuto = AL_AUXILIARY_SEND_FILTER_GAINHF_AUTO,
    srcDirectFilter = AL_DIRECT_FILTER,
    srcAuxSendFilter = AL_AUXILIARY_SEND_FILTER,

    /* AL_SOFT_direct_channels */
    srcDirectChannelsSOFT = AL_DIRECT_CHANNELS_SOFT,

    /* AL_EXT_source_distance_model */
    srcDistanceModel = AL_DISTANCE_MODEL,

    /* AL_SOFT_source_latency */
    srcSampleOffsetLatencySOFT = AL_SAMPLE_OFFSET_LATENCY_SOFT,
    srcSecOffsetLatencySOFT = AL_SEC_OFFSET_LATENCY_SOFT,

    /* AL_EXT_STEREO_ANGLES */
    srcAngles = AL_STEREO_ANGLES,

    /* AL_EXT_SOURCE_RADIUS */
    srcRadius = AL_SOURCE_RADIUS,

    /* AL_EXT_BFORMAT */
    srcOrientation = AL_ORIENTATION,

    /* AL_SOFT_source_length */
    srcByteLength = AL_BYTE_LENGTH_SOFT,
    srcSampleLength = AL_SAMPLE_LENGTH_SOFT,
    srcSecLength = AL_SEC_LENGTH_SOFT,

    /* AL_SOFT_source_resampler */
    srcResampler = AL_SOURCE_RESAMPLER_SOFT,

    /* AL_SOFT_source_spatialize */
    srcSpatialize = AL_SOURCE_SPATIALIZE_SOFT,

    /* ALC_SOFT_device_clock */
    srcSampleOffsetClockSOFT = AL_SAMPLE_OFFSET_CLOCK_SOFT,
    srcSecOffsetClockSOFT = AL_SEC_OFFSET_CLOCK_SOFT,

    /* AL_SOFT_UHJ */
    srcStereoMode = AL_STEREO_MODE_SOFT,
    srcSuperStereoWidth = AL_SUPER_STEREO_WIDTH_SOFT,

    /* AL_SOFT_buffer_sub_data */
    srcByteRWOffsetsSOFT = AL_BYTE_RW_OFFSETS_SOFT,
    srcSampleRWOffsetsSOFT = AL_SAMPLE_RW_OFFSETS_SOFT,
};


constexpr ALuint IntValsByProp(ALenum prop)
{
    switch(static_cast<SourceProp>(prop))
    {
    case AL_SOURCE_STATE:
    case AL_SOURCE_TYPE:
    case AL_BUFFERS_QUEUED:
    case AL_BUFFERS_PROCESSED:
    case AL_BYTE_LENGTH_SOFT:
    case AL_SAMPLE_LENGTH_SOFT:
    case AL_SOURCE_RELATIVE:
    case AL_LOOPING:
    case AL_BUFFER:
    case AL_SAMPLE_OFFSET:
    case AL_BYTE_OFFSET:
    case AL_DIRECT_FILTER:
    case AL_DIRECT_FILTER_GAINHF_AUTO:
    case AL_AUXILIARY_SEND_FILTER_GAIN_AUTO:
    case AL_AUXILIARY_SEND_FILTER_GAINHF_AUTO:
    case AL_DIRECT_CHANNELS_SOFT:
    case AL_DISTANCE_MODEL:
    case AL_SOURCE_RESAMPLER_SOFT:
    case AL_SOURCE_SPATIALIZE_SOFT:
    case AL_STEREO_MODE_SOFT:
        return 1;

    case AL_SOURCE_RADIUS: /*AL_BYTE_RW_OFFSETS_SOFT:*/
        if(sBufferSubDataCompat)
            return 2;
        /*fall-through*/
    case AL_CONE_INNER_ANGLE:
    case AL_CONE_OUTER_ANGLE:
    case AL_PITCH:
    case AL_GAIN:
    case AL_MIN_GAIN:
    case AL_MAX_GAIN:
    case AL_REFERENCE_DISTANCE:
    case AL_ROLLOFF_FACTOR:
    case AL_CONE_OUTER_GAIN:
    case AL_MAX_DISTANCE:
    case AL_SEC_OFFSET:
    case AL_DOPPLER_FACTOR:
    case AL_CONE_OUTER_GAINHF:
    case AL_AIR_ABSORPTION_FACTOR:
    case AL_ROOM_ROLLOFF_FACTOR:
    case AL_SEC_LENGTH_SOFT:
    case AL_SUPER_STEREO_WIDTH_SOFT:
        return 1; /* 1x float */

    case AL_SAMPLE_RW_OFFSETS_SOFT:
        if(sBufferSubDataCompat)
            return 2;
        break;

    case AL_AUXILIARY_SEND_FILTER:
        return 3;

    case AL_POSITION:
    case AL_VELOCITY:
    case AL_DIRECTION:
        return 3; /* 3x float */

    case AL_ORIENTATION:
        return 6; /* 6x float */

    case AL_SAMPLE_OFFSET_LATENCY_SOFT:
    case AL_SAMPLE_OFFSET_CLOCK_SOFT:
    case AL_STEREO_ANGLES:
        break; /* i64 only */
    case AL_SEC_OFFSET_LATENCY_SOFT:
    case AL_SEC_OFFSET_CLOCK_SOFT:
        break; /* double only */
    }

    return 0;
}

constexpr ALuint Int64ValsByProp(ALenum prop)
{
    switch(static_cast<SourceProp>(prop))
    {
    case AL_SOURCE_STATE:
    case AL_SOURCE_TYPE:
    case AL_BUFFERS_QUEUED:
    case AL_BUFFERS_PROCESSED:
    case AL_BYTE_LENGTH_SOFT:
    case AL_SAMPLE_LENGTH_SOFT:
    case AL_SOURCE_RELATIVE:
    case AL_LOOPING:
    case AL_BUFFER:
    case AL_SAMPLE_OFFSET:
    case AL_BYTE_OFFSET:
    case AL_DIRECT_FILTER:
    case AL_DIRECT_FILTER_GAINHF_AUTO:
    case AL_AUXILIARY_SEND_FILTER_GAIN_AUTO:
    case AL_AUXILIARY_SEND_FILTER_GAINHF_AUTO:
    case AL_DIRECT_CHANNELS_SOFT:
    case AL_DISTANCE_MODEL:
    case AL_SOURCE_RESAMPLER_SOFT:
    case AL_SOURCE_SPATIALIZE_SOFT:
    case AL_STEREO_MODE_SOFT:
        return 1;

    case AL_SOURCE_RADIUS: /*AL_BYTE_RW_OFFSETS_SOFT:*/
        if(sBufferSubDataCompat)
            return 2;
        /*fall-through*/
    case AL_CONE_INNER_ANGLE:
    case AL_CONE_OUTER_ANGLE:
    case AL_PITCH:
    case AL_GAIN:
    case AL_MIN_GAIN:
    case AL_MAX_GAIN:
    case AL_REFERENCE_DISTANCE:
    case AL_ROLLOFF_FACTOR:
    case AL_CONE_OUTER_GAIN:
    case AL_MAX_DISTANCE:
    case AL_SEC_OFFSET:
    case AL_DOPPLER_FACTOR:
    case AL_CONE_OUTER_GAINHF:
    case AL_AIR_ABSORPTION_FACTOR:
    case AL_ROOM_ROLLOFF_FACTOR:
    case AL_SEC_LENGTH_SOFT:
    case AL_SUPER_STEREO_WIDTH_SOFT:
        return 1; /* 1x float */

    case AL_SAMPLE_RW_OFFSETS_SOFT:
        if(sBufferSubDataCompat)
            return 2;
        break;

    case AL_SAMPLE_OFFSET_LATENCY_SOFT:
    case AL_SAMPLE_OFFSET_CLOCK_SOFT:
    case AL_STEREO_ANGLES:
        return 2;

    case AL_AUXILIARY_SEND_FILTER:
        return 3;

    case AL_POSITION:
    case AL_VELOCITY:
    case AL_DIRECTION:
        return 3; /* 3x float */

    case AL_ORIENTATION:
        return 6; /* 6x float */

    case AL_SEC_OFFSET_LATENCY_SOFT:
    case AL_SEC_OFFSET_CLOCK_SOFT:
        break; /* double only */
    }

    return 0;
}

constexpr ALuint FloatValsByProp(ALenum prop)
{
    switch(static_cast<SourceProp>(prop))
    {
    case AL_PITCH:
    case AL_GAIN:
    case AL_MIN_GAIN:
    case AL_MAX_GAIN:
    case AL_MAX_DISTANCE:
    case AL_ROLLOFF_FACTOR:
    case AL_DOPPLER_FACTOR:
    case AL_CONE_OUTER_GAIN:
    case AL_SEC_OFFSET:
    case AL_SAMPLE_OFFSET:
    case AL_BYTE_OFFSET:
    case AL_CONE_INNER_ANGLE:
    case AL_CONE_OUTER_ANGLE:
    case AL_REFERENCE_DISTANCE:
    case AL_CONE_OUTER_GAINHF:
    case AL_AIR_ABSORPTION_FACTOR:
    case AL_ROOM_ROLLOFF_FACTOR:
    case AL_DIRECT_FILTER_GAINHF_AUTO:
    case AL_AUXILIARY_SEND_FILTER_GAIN_AUTO:
    case AL_AUXILIARY_SEND_FILTER_GAINHF_AUTO:
    case AL_DIRECT_CHANNELS_SOFT:
    case AL_DISTANCE_MODEL:
    case AL_SOURCE_RELATIVE:
    case AL_LOOPING:
    case AL_SOURCE_STATE:
    case AL_BUFFERS_QUEUED:
    case AL_BUFFERS_PROCESSED:
    case AL_SOURCE_TYPE:
    case AL_SOURCE_RESAMPLER_SOFT:
    case AL_SOURCE_SPATIALIZE_SOFT:
    case AL_BYTE_LENGTH_SOFT:
    case AL_SAMPLE_LENGTH_SOFT:
    case AL_SEC_LENGTH_SOFT:
    case AL_STEREO_MODE_SOFT:
    case AL_SUPER_STEREO_WIDTH_SOFT:
        return 1;

    case AL_SOURCE_RADIUS: /*AL_BYTE_RW_OFFSETS_SOFT:*/
        if(!sBufferSubDataCompat)
            return 1;
        /*fall-through*/
    case AL_SAMPLE_RW_OFFSETS_SOFT:
        break;

    case AL_STEREO_ANGLES:
        return 2;

    case AL_POSITION:
    case AL_VELOCITY:
    case AL_DIRECTION:
        return 3;

    case AL_ORIENTATION:
        return 6;

    case AL_SEC_OFFSET_LATENCY_SOFT:
    case AL_SEC_OFFSET_CLOCK_SOFT:
        break; /* Double only */

    case AL_BUFFER:
    case AL_DIRECT_FILTER:
    case AL_AUXILIARY_SEND_FILTER:
        break; /* i/i64 only */
    case AL_SAMPLE_OFFSET_LATENCY_SOFT:
    case AL_SAMPLE_OFFSET_CLOCK_SOFT:
        break; /* i64 only */
    }
    return 0;
}
constexpr ALuint DoubleValsByProp(ALenum prop)
{
    switch(static_cast<SourceProp>(prop))
    {
    case AL_PITCH:
    case AL_GAIN:
    case AL_MIN_GAIN:
    case AL_MAX_GAIN:
    case AL_MAX_DISTANCE:
    case AL_ROLLOFF_FACTOR:
    case AL_DOPPLER_FACTOR:
    case AL_CONE_OUTER_GAIN:
    case AL_SEC_OFFSET:
    case AL_SAMPLE_OFFSET:
    case AL_BYTE_OFFSET:
    case AL_CONE_INNER_ANGLE:
    case AL_CONE_OUTER_ANGLE:
    case AL_REFERENCE_DISTANCE:
    case AL_CONE_OUTER_GAINHF:
    case AL_AIR_ABSORPTION_FACTOR:
    case AL_ROOM_ROLLOFF_FACTOR:
    case AL_DIRECT_FILTER_GAINHF_AUTO:
    case AL_AUXILIARY_SEND_FILTER_GAIN_AUTO:
    case AL_AUXILIARY_SEND_FILTER_GAINHF_AUTO:
    case AL_DIRECT_CHANNELS_SOFT:
    case AL_DISTANCE_MODEL:
    case AL_SOURCE_RELATIVE:
    case AL_LOOPING:
    case AL_SOURCE_STATE:
    case AL_BUFFERS_QUEUED:
    case AL_BUFFERS_PROCESSED:
    case AL_SOURCE_TYPE:
    case AL_SOURCE_RESAMPLER_SOFT:
    case AL_SOURCE_SPATIALIZE_SOFT:
    case AL_BYTE_LENGTH_SOFT:
    case AL_SAMPLE_LENGTH_SOFT:
    case AL_SEC_LENGTH_SOFT:
    case AL_STEREO_MODE_SOFT:
    case AL_SUPER_STEREO_WIDTH_SOFT:
        return 1;

    case AL_SOURCE_RADIUS: /*AL_BYTE_RW_OFFSETS_SOFT:*/
        if(!sBufferSubDataCompat)
            return 1;
        /*fall-through*/
    case AL_SAMPLE_RW_OFFSETS_SOFT:
        break;

    case AL_SEC_OFFSET_LATENCY_SOFT:
    case AL_SEC_OFFSET_CLOCK_SOFT:
    case AL_STEREO_ANGLES:
        return 2;

    case AL_POSITION:
    case AL_VELOCITY:
    case AL_DIRECTION:
        return 3;

    case AL_ORIENTATION:
        return 6;

    case AL_BUFFER:
    case AL_DIRECT_FILTER:
    case AL_AUXILIARY_SEND_FILTER:
        break; /* i/i64 only */
    case AL_SAMPLE_OFFSET_LATENCY_SOFT:
    case AL_SAMPLE_OFFSET_CLOCK_SOFT:
        break; /* i64 only */
    }
    return 0;
}


struct check_exception : std::exception {
};
struct check_size_exception final : check_exception {
    const char *what() const noexcept override
    { return "check_size_exception"; }
};
struct check_value_exception final : check_exception {
    const char *what() const noexcept override
    { return "check_value_exception"; }
};


void UpdateSourceProps(ALsource *source, ALCcontext *context)
{
    if(!context->mDeferUpdates)
    {
        if(Voice *voice{GetSourceVoice(source, context)})
        {
            UpdateSourceProps(source, voice, context);
            return;
        }
    }
    source->mPropsDirty = true;
}
#ifdef ALSOFT_EAX
void CommitAndUpdateSourceProps(ALsource *source, ALCcontext *context)
{
    if(!context->mDeferUpdates)
    {
        if(context->hasEax())
            source->eaxCommit();
        if(Voice *voice{GetSourceVoice(source, context)})
        {
            UpdateSourceProps(source, voice, context);
            return;
        }
    }
    source->mPropsDirty = true;
}

#else

inline void CommitAndUpdateSourceProps(ALsource *source, ALCcontext *context)
{ UpdateSourceProps(source, context); }
#endif


template<typename T>
struct PropType { };
template<>
struct PropType<ALint> { static const char *Name() { return "integer"; } };
template<>
struct PropType<ALint64SOFT> { static const char *Name() { return "int64"; } };
template<>
struct PropType<ALfloat> { static const char *Name() { return "float"; } };
template<>
struct PropType<ALdouble> { static const char *Name() { return "double"; } };

template<typename T>
struct HexPrinter {
    char mStr[sizeof(T)*2 + 3]{};
    HexPrinter(T value)
    {
        using ST = std::make_signed_t<std::remove_cv_t<T>>;
        if constexpr(std::is_same_v<ST,int>)
            std::snprintf(mStr, std::size(mStr), "0x%x", value);
        else if constexpr(std::is_same_v<ST,long>)
            std::snprintf(mStr, std::size(mStr), "0x%lx", value);
        else if constexpr(std::is_same_v<ST,long long>)
            std::snprintf(mStr, std::size(mStr), "0x%llx", value);
    }

    const char *c_str() const noexcept { return mStr; }
};


/**
 * Returns a pair of lambdas to check the following setter.
 *
 * The first lambda checks the size of the span is valid for the required size,
 * setting the proper context error and throwing a check_size_exception if it
 * fails.
 *
 * The second lambda tests the validity of the value check, setting the proper
 * context error and throwing a check_value_exception if it failed.
 */
template<typename T, size_t N>
auto GetCheckers(ALCcontext *const Context, const SourceProp prop, const al::span<T,N> values)
{
    return std::make_pair(
        [=](size_t expect) -> void
        {
            if(values.size() == expect) LIKELY return;
            Context->setError(AL_INVALID_ENUM, "Property 0x%04x expects %zu value(s), got %zu",
                prop, expect, values.size());
            throw check_size_exception{};
        },
        [Context](bool passed) -> void
        {
            if(passed) LIKELY return;
            Context->setError(AL_INVALID_VALUE, "Value out of range");
            throw check_value_exception{};
        }
    );
}

template<typename T>
NOINLINE void SetProperty(ALsource *const Source, ALCcontext *const Context, const SourceProp prop,
    const al::span<const T> values) try
{
    auto&& [CheckSize, CheckValue] = GetCheckers(Context, prop, values);
    ALCdevice *device{Context->mALDevice.get()};

    switch(prop)
    {
    case AL_SOURCE_STATE:
    case AL_SOURCE_TYPE:
    case AL_BUFFERS_QUEUED:
    case AL_BUFFERS_PROCESSED:
        if constexpr(std::is_integral_v<T>)
        {
            /* Query only */
            return Context->setError(AL_INVALID_OPERATION,
                "Setting read-only source property 0x%04x", prop);
        }
        break;

    case AL_BYTE_LENGTH_SOFT:
    case AL_SAMPLE_LENGTH_SOFT:
    case AL_SEC_LENGTH_SOFT:
    case AL_SAMPLE_OFFSET_LATENCY_SOFT:
    case AL_SEC_OFFSET_LATENCY_SOFT:
    case AL_SAMPLE_OFFSET_CLOCK_SOFT:
    case AL_SEC_OFFSET_CLOCK_SOFT:
        /* Query only */
        return Context->setError(AL_INVALID_OPERATION,
            "Setting read-only source property 0x%04x", prop);

    case AL_PITCH:
        CheckSize(1);
        CheckValue(values[0] >= T{0});

        Source->Pitch = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_CONE_INNER_ANGLE:
        CheckSize(1);
        CheckValue(values[0] >= T{0} && values[0] <= T{360});

        Source->InnerAngle = static_cast<float>(values[0]);
        return CommitAndUpdateSourceProps(Source, Context);

    case AL_CONE_OUTER_ANGLE:
        CheckSize(1);
        CheckValue(values[0] >= T{0} && values[0] <= T{360});

        Source->OuterAngle = static_cast<float>(values[0]);
        return CommitAndUpdateSourceProps(Source, Context);

    case AL_GAIN:
        CheckSize(1);
        CheckValue(values[0] >= T{0});

        Source->Gain = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_MAX_DISTANCE:
        CheckSize(1);
        CheckValue(values[0] >= T{0});

        Source->MaxDistance = static_cast<float>(values[0]);
        return CommitAndUpdateSourceProps(Source, Context);

    case AL_ROLLOFF_FACTOR:
        CheckSize(1);
        CheckValue(values[0] >= T{0});

        Source->RolloffFactor = static_cast<float>(values[0]);
        return CommitAndUpdateSourceProps(Source, Context);

    case AL_REFERENCE_DISTANCE:
        CheckSize(1);
        CheckValue(values[0] >= T{0});

        Source->RefDistance = static_cast<float>(values[0]);
        return CommitAndUpdateSourceProps(Source, Context);

    case AL_MIN_GAIN:
        CheckSize(1);
        CheckValue(values[0] >= T{0});

        Source->MinGain = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_MAX_GAIN:
        CheckSize(1);
        CheckValue(values[0] >= T{0});

        Source->MaxGain = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_CONE_OUTER_GAIN:
        CheckSize(1);
        CheckValue(values[0] >= T{0} && values[0] <= T{1});

        Source->OuterGain = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_CONE_OUTER_GAINHF:
        CheckSize(1);
        CheckValue(values[0] >= T{0} && values[0] <= T{1});

        Source->OuterGainHF = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_AIR_ABSORPTION_FACTOR:
        CheckSize(1);
        CheckValue(values[0] >= T{0} && values[0] <= T{10});

        Source->AirAbsorptionFactor = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_ROOM_ROLLOFF_FACTOR:
        CheckSize(1);
        CheckValue(values[0] >= T{0} && values[0] <= T{1});

        Source->RoomRolloffFactor = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_DOPPLER_FACTOR:
        CheckSize(1);
        CheckValue(values[0] >= T{0} && values[0] <= T{1});

        Source->DopplerFactor = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);


    case AL_SOURCE_RELATIVE:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            CheckValue(values[0] == AL_FALSE || values[0] == AL_TRUE);

            Source->HeadRelative = values[0] != AL_FALSE;
            return CommitAndUpdateSourceProps(Source, Context);
        }
        break;

    case AL_LOOPING:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            CheckValue(values[0] == AL_FALSE || values[0] == AL_TRUE);

            Source->Looping = values[0] != AL_FALSE;
            if(Voice *voice{GetSourceVoice(Source, Context)})
            {
                if(Source->Looping)
                    voice->mLoopBuffer.store(&Source->mQueue.front(), std::memory_order_release);
                else
                    voice->mLoopBuffer.store(nullptr, std::memory_order_release);

                /* If the source is playing, wait for the current mix to finish
                 * to ensure it isn't currently looping back or reaching the
                 * end.
                 */
                device->waitForMix();
            }
            return;
        }
        break;

    case AL_BUFFER:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            {
                const ALenum state{GetSourceState(Source, GetSourceVoice(Source, Context))};
                if(state == AL_PLAYING || state == AL_PAUSED)
                    return Context->setError(AL_INVALID_OPERATION,
                        "Setting buffer on playing or paused source %u", Source->id);
            }
            al::deque<ALbufferQueueItem> oldlist;
            if(values[0])
            {
                using UT = std::make_unsigned_t<T>;
                std::lock_guard<std::mutex> _{device->BufferLock};
                ALbuffer *buffer{LookupBuffer(device, static_cast<UT>(values[0]))};
                if(!buffer) UNLIKELY
                    return Context->setError(AL_INVALID_VALUE, "Invalid buffer ID %s",
                        std::to_string(values[0]).c_str());
                if(buffer->MappedAccess && !(buffer->MappedAccess&AL_MAP_PERSISTENT_BIT_SOFT)) UNLIKELY
                    return Context->setError(AL_INVALID_OPERATION,
                        "Setting non-persistently mapped buffer %u", buffer->id);
                if(buffer->mCallback && ReadRef(buffer->ref) != 0) UNLIKELY
                    return Context->setError(AL_INVALID_OPERATION,
                        "Setting already-set callback buffer %u", buffer->id);

                /* Add the selected buffer to a one-item queue */
                al::deque<ALbufferQueueItem> newlist;
                newlist.emplace_back();
                newlist.back().mCallback = buffer->mCallback;
                newlist.back().mUserData = buffer->mUserData;
                newlist.back().mBlockAlign = buffer->mBlockAlign;
                newlist.back().mSampleLen = buffer->mSampleLen;
                newlist.back().mLoopStart = buffer->mLoopStart;
                newlist.back().mLoopEnd = buffer->mLoopEnd;
                newlist.back().mSamples = buffer->mData.data();
                newlist.back().mBuffer = buffer;
                IncrementRef(buffer->ref);

                /* Source is now Static */
                Source->SourceType = AL_STATIC;
                Source->mQueue.swap(oldlist);
                Source->mQueue.swap(newlist);
            }
            else
            {
                /* Source is now Undetermined */
                Source->SourceType = AL_UNDETERMINED;
                Source->mQueue.swap(oldlist);
            }

            /* Delete all elements in the previous queue */
            for(auto &item : oldlist)
            {
                if(ALbuffer *buffer{item.mBuffer})
                    DecrementRef(buffer->ref);
            }
            return;
        }
        break;


    case AL_SEC_OFFSET:
    case AL_SAMPLE_OFFSET:
    case AL_BYTE_OFFSET:
        CheckSize(1);
        if constexpr(std::is_floating_point_v<T>)
            CheckValue(std::isfinite(values[0]));

        if(Voice *voice{GetSourceVoice(Source, Context)})
        {
            auto vpos = GetSampleOffset(Source->mQueue, prop, static_cast<double>(values[0]));
            if(!vpos) return Context->setError(AL_INVALID_VALUE, "Invalid offset");

            if(SetVoiceOffset(voice, *vpos, Source, Context, Context->mALDevice.get()))
                return;
        }
        Source->OffsetType = prop;
        Source->Offset = static_cast<double>(values[0]);
        return;

    case AL_SAMPLE_RW_OFFSETS_SOFT:
        if(sBufferSubDataCompat)
        {
            if constexpr(std::is_integral_v<T>)
            {
                /* Query only */
                return Context->setError(AL_INVALID_OPERATION,
                    "Setting read-only source property 0x%04x", prop);
            }
        }
        break;

    case AL_SOURCE_RADIUS: /*AL_BYTE_RW_OFFSETS_SOFT:*/
        if(sBufferSubDataCompat)
        {
            if constexpr(std::is_integral_v<T>)
            {
                /* Query only */
                return Context->setError(AL_INVALID_OPERATION,
                    "Setting read-only source property 0x%04x", prop);
            }
            break;
        }
        CheckSize(1);
        if constexpr(std::is_floating_point_v<T>)
            CheckValue(values[0] >= T{0} && std::isfinite(static_cast<float>(values[0])));
        else
            CheckValue(values[0] >= T{0});

        Source->Radius = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_SUPER_STEREO_WIDTH_SOFT:
        CheckSize(1);
        CheckValue(values[0] >= T{0} && values[0] <= T{1});

        Source->EnhWidth = static_cast<float>(values[0]);
        return UpdateSourceProps(Source, Context);

    case AL_STEREO_ANGLES:
        CheckSize(2);
        if constexpr(std::is_floating_point_v<T>)
            CheckValue(std::isfinite(static_cast<float>(values[0]))
                && std::isfinite(static_cast<float>(values[1])));

        Source->StereoPan[0] = static_cast<float>(values[0]);
        Source->StereoPan[1] = static_cast<float>(values[1]);
        return UpdateSourceProps(Source, Context);


    case AL_POSITION:
        CheckSize(3);
        if constexpr(std::is_floating_point_v<T>)
            CheckValue(std::isfinite(static_cast<float>(values[0]))
                && std::isfinite(static_cast<float>(values[1]))
                && std::isfinite(static_cast<float>(values[2])));

        Source->Position[0] = static_cast<float>(values[0]);
        Source->Position[1] = static_cast<float>(values[1]);
        Source->Position[2] = static_cast<float>(values[2]);
        return CommitAndUpdateSourceProps(Source, Context);

    case AL_VELOCITY:
        CheckSize(3);
        if constexpr(std::is_floating_point_v<T>)
            CheckValue(std::isfinite(static_cast<float>(values[0]))
                && std::isfinite(static_cast<float>(values[1]))
                && std::isfinite(static_cast<float>(values[2])));

        Source->Velocity[0] = static_cast<float>(values[0]);
        Source->Velocity[1] = static_cast<float>(values[1]);
        Source->Velocity[2] = static_cast<float>(values[2]);
        return CommitAndUpdateSourceProps(Source, Context);

    case AL_DIRECTION:
        CheckSize(3);
        if constexpr(std::is_floating_point_v<T>)
            CheckValue(std::isfinite(static_cast<float>(values[0]))
                && std::isfinite(static_cast<float>(values[1]))
                && std::isfinite(static_cast<float>(values[2])));

        Source->Direction[0] = static_cast<float>(values[0]);
        Source->Direction[1] = static_cast<float>(values[1]);
        Source->Direction[2] = static_cast<float>(values[2]);
        return CommitAndUpdateSourceProps(Source, Context);

    case AL_ORIENTATION:
        CheckSize(6);
        if constexpr(std::is_floating_point_v<T>)
            CheckValue(std::isfinite(static_cast<float>(values[0]))
                && std::isfinite(static_cast<float>(values[1]))
                && std::isfinite(static_cast<float>(values[2]))
                && std::isfinite(static_cast<float>(values[3]))
                && std::isfinite(static_cast<float>(values[4]))
                && std::isfinite(static_cast<float>(values[5])));

        Source->OrientAt[0] = static_cast<float>(values[0]);
        Source->OrientAt[1] = static_cast<float>(values[1]);
        Source->OrientAt[2] = static_cast<float>(values[2]);
        Source->OrientUp[0] = static_cast<float>(values[3]);
        Source->OrientUp[1] = static_cast<float>(values[4]);
        Source->OrientUp[2] = static_cast<float>(values[5]);
        return UpdateSourceProps(Source, Context);


    case AL_DIRECT_FILTER:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            const auto filterid = static_cast<std::make_unsigned_t<T>>(values[0]);
            if(values[0])
            {
                std::lock_guard<std::mutex> _{device->FilterLock};
                ALfilter *filter{LookupFilter(device, filterid)};
                if(!filter) UNLIKELY
                    return Context->setError(AL_INVALID_VALUE, "Invalid filter ID %s",
                        std::to_string(filterid).c_str());
                Source->Direct.Gain = filter->Gain;
                Source->Direct.GainHF = filter->GainHF;
                Source->Direct.HFReference = filter->HFReference;
                Source->Direct.GainLF = filter->GainLF;
                Source->Direct.LFReference = filter->LFReference;
            }
            else
            {
                Source->Direct.Gain = 1.0f;
                Source->Direct.GainHF = 1.0f;
                Source->Direct.HFReference = LOWPASSFREQREF;
                Source->Direct.GainLF = 1.0f;
                Source->Direct.LFReference = HIGHPASSFREQREF;
            }
            return UpdateSourceProps(Source, Context);
        }
        break;

    case AL_DIRECT_FILTER_GAINHF_AUTO:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            CheckValue(values[0] == AL_FALSE || values[0] == AL_TRUE);

            Source->DryGainHFAuto = values[0] != AL_FALSE;
            return UpdateSourceProps(Source, Context);
        }
        break;

    case AL_AUXILIARY_SEND_FILTER_GAIN_AUTO:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            CheckValue(values[0] == AL_FALSE || values[0] == AL_TRUE);

            Source->WetGainAuto = values[0] != AL_FALSE;
            return UpdateSourceProps(Source, Context);
        }
        break;

    case AL_AUXILIARY_SEND_FILTER_GAINHF_AUTO:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            CheckValue(values[0] == AL_FALSE || values[0] == AL_TRUE);

            Source->WetGainHFAuto = values[0] != AL_FALSE;
            return UpdateSourceProps(Source, Context);
        }
        break;

    case AL_DIRECT_CHANNELS_SOFT:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            if(auto mode = DirectModeFromEnum(values[0]))
            {
                Source->DirectChannels = *mode;
                return UpdateSourceProps(Source, Context);
            }
            return Context->setError(AL_INVALID_VALUE, "Invalid direct channels mode: %s\n",
                HexPrinter{values[0]}.c_str());
        }
        break;

    case AL_DISTANCE_MODEL:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            if(auto model = DistanceModelFromALenum(values[0]))
            {
                Source->mDistanceModel = *model;
                if(Context->mSourceDistanceModel)
                    UpdateSourceProps(Source, Context);
                return;
            }
            return Context->setError(AL_INVALID_VALUE, "Invalid distance model: %s\n",
                HexPrinter{values[0]}.c_str());
        }
        break;

    case AL_SOURCE_RESAMPLER_SOFT:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            CheckValue(values[0] >= 0 && values[0] <= static_cast<int>(Resampler::Max));

            Source->mResampler = static_cast<Resampler>(values[0]);
            return UpdateSourceProps(Source, Context);
        }
        break;

    case AL_SOURCE_SPATIALIZE_SOFT:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            if(auto mode = SpatializeModeFromEnum(values[0]))
            {
                Source->mSpatialize = *mode;
                return UpdateSourceProps(Source, Context);
            }
            return Context->setError(AL_INVALID_VALUE, "Invalid source spatialize mode: %s\n",
                HexPrinter{values[0]}.c_str());
        }
        break;

    case AL_STEREO_MODE_SOFT:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            {
                const ALenum state{GetSourceState(Source, GetSourceVoice(Source, Context))};
                if(state == AL_PLAYING || state == AL_PAUSED)
                    return Context->setError(AL_INVALID_OPERATION,
                        "Modifying stereo mode on playing or paused source %u", Source->id);
            }
            if(auto mode = StereoModeFromEnum(values[0]))
            {
                Source->mStereoMode = *mode;
                return;
            }
            return Context->setError(AL_INVALID_VALUE, "Invalid stereo mode: %s\n",
                HexPrinter{values[0]}.c_str());
        }
        break;

    case AL_AUXILIARY_SEND_FILTER:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(3);
            const auto slotid = static_cast<std::make_unsigned_t<T>>(values[0]);
            const auto sendidx = static_cast<std::make_unsigned_t<T>>(values[1]);
            const auto filterid = static_cast<std::make_unsigned_t<T>>(values[2]);

            std::unique_lock slotlock{Context->mEffectSlotLock};
            ALeffectslot *slot{};
            if(values[0])
            {
                if((slot=LookupEffectSlot(Context, slotid)) == nullptr) UNLIKELY
                    return Context->setError(AL_INVALID_VALUE, "Invalid effect ID %s",
                        std::to_string(slotid).c_str());
            }

            if(sendidx >= device->NumAuxSends) UNLIKELY
                return Context->setError(AL_INVALID_VALUE, "Invalid send %s",
                    std::to_string(sendidx).c_str());
            auto &send = Source->Send[static_cast<size_t>(sendidx)];

            if(values[2])
            {
                std::lock_guard<std::mutex> _{device->FilterLock};
                ALfilter *filter{LookupFilter(device, filterid)};
                if(!filter) UNLIKELY
                    return Context->setError(AL_INVALID_VALUE, "Invalid filter ID %s",
                        std::to_string(filterid).c_str());

                send.Gain = filter->Gain;
                send.GainHF = filter->GainHF;
                send.HFReference = filter->HFReference;
                send.GainLF = filter->GainLF;
                send.LFReference = filter->LFReference;
            }
            else
            {
                /* Disable filter */
                send.Gain = 1.0f;
                send.GainHF = 1.0f;
                send.HFReference = LOWPASSFREQREF;
                send.GainLF = 1.0f;
                send.LFReference = HIGHPASSFREQREF;
            }

            /* We must force an update if the current auxiliary slot is valid
             * and about to be changed on an active source, in case the old
             * slot is about to be deleted.
             */
            if(send.Slot && slot != send.Slot && IsPlayingOrPaused(Source))
            {
                /* Add refcount on the new slot, and release the previous slot */
                if(slot) IncrementRef(slot->ref);
                if(auto *oldslot = send.Slot)
                    DecrementRef(oldslot->ref);
                send.Slot = slot;

                Voice *voice{GetSourceVoice(Source, Context)};
                if(voice) UpdateSourceProps(Source, voice, Context);
                else Source->mPropsDirty = true;
            }
            else
            {
                if(slot) IncrementRef(slot->ref);
                if(auto *oldslot = send.Slot)
                    DecrementRef(oldslot->ref);
                send.Slot = slot;
                UpdateSourceProps(Source, Context);
            }
            return;
        }
        break;
    }

    ERR("Unexpected %s property: 0x%04x\n", PropType<T>::Name(), prop);
    Context->setError(AL_INVALID_ENUM, "Invalid source %s property 0x%04x", PropType<T>::Name(),
        prop);
}
catch(check_exception&) {
}


template<typename T, size_t N>
auto GetSizeChecker(ALCcontext *const Context, const SourceProp prop, const al::span<T,N> values)
{
    return [=](size_t expect) -> void
    {
        if(values.size() == expect) LIKELY return;
        Context->setError(AL_INVALID_ENUM, "Property 0x%04x expects %zu value(s), got %zu",
            prop, expect, values.size());
        throw check_size_exception{};
    };
}

template<typename T>
[[nodiscard]] NOINLINE
bool GetProperty(ALsource *const Source, ALCcontext *const Context, const SourceProp prop,
    const al::span<T> values) try
{
    using std::chrono::duration_cast;
    auto CheckSize = GetSizeChecker(Context, prop, values);
    ALCdevice *device{Context->mALDevice.get()};

    switch(prop)
    {
    case AL_GAIN:
        CheckSize(1);
        values[0] = static_cast<T>(Source->Gain);
        return true;

    case AL_PITCH:
        CheckSize(1);
        values[0] = static_cast<T>(Source->Pitch);
        return true;

    case AL_MAX_DISTANCE:
        CheckSize(1);
        values[0] = static_cast<T>(Source->MaxDistance);
        return true;

    case AL_ROLLOFF_FACTOR:
        CheckSize(1);
        values[0] = static_cast<T>(Source->RolloffFactor);
        return true;

    case AL_REFERENCE_DISTANCE:
        CheckSize(1);
        values[0] = static_cast<T>(Source->RefDistance);
        return true;

    case AL_CONE_INNER_ANGLE:
        CheckSize(1);
        values[0] = static_cast<T>(Source->InnerAngle);
        return true;

    case AL_CONE_OUTER_ANGLE:
        CheckSize(1);
        values[0] = static_cast<T>(Source->OuterAngle);
        return true;

    case AL_MIN_GAIN:
        CheckSize(1);
        values[0] = static_cast<T>(Source->MinGain);
        return true;

    case AL_MAX_GAIN:
        CheckSize(1);
        values[0] = static_cast<T>(Source->MaxGain);
        return true;

    case AL_CONE_OUTER_GAIN:
        CheckSize(1);
        values[0] = static_cast<T>(Source->OuterGain);
        return true;

    case AL_SEC_OFFSET:
    case AL_SAMPLE_OFFSET:
    case AL_BYTE_OFFSET:
        CheckSize(1);
        values[0] = GetSourceOffset<T>(Source, prop, Context);
        return true;

    case AL_CONE_OUTER_GAINHF:
        CheckSize(1);
        values[0] = static_cast<T>(Source->OuterGainHF);
        return true;

    case AL_AIR_ABSORPTION_FACTOR:
        CheckSize(1);
        values[0] = static_cast<T>(Source->AirAbsorptionFactor);
        return true;

    case AL_ROOM_ROLLOFF_FACTOR:
        CheckSize(1);
        values[0] = static_cast<T>(Source->RoomRolloffFactor);
        return true;

    case AL_DOPPLER_FACTOR:
        CheckSize(1);
        values[0] = static_cast<T>(Source->DopplerFactor);
        return true;

    case AL_SAMPLE_RW_OFFSETS_SOFT:
        if constexpr(std::is_integral_v<T>)
        {
            if(sBufferSubDataCompat)
            {
                CheckSize(2);
                values[0] = GetSourceOffset<T>(Source, AL_SAMPLE_OFFSET, Context);
                /* FIXME: values[1] should be ahead of values[0] by the device
                 * update time. It needs to clamp or wrap the length of the
                 * buffer queue.
                 */
                values[1] = values[0];
                return true;
            }
        }
        break;
    case AL_SOURCE_RADIUS: /*AL_BYTE_RW_OFFSETS_SOFT:*/
        if constexpr(std::is_floating_point_v<T>)
        {
            if(sBufferSubDataCompat)
                break;

            CheckSize(1);
            values[0] = static_cast<T>(Source->Radius);
            return true;
        }
        else
        {
            if(sBufferSubDataCompat)
            {
                CheckSize(2);
                values[0] = GetSourceOffset<T>(Source, AL_BYTE_OFFSET, Context);
                /* FIXME: values[1] should be ahead of values[0] by the device
                 * update time. It needs to clamp or wrap the length of the
                 * buffer queue.
                 */
                values[1] = values[0];
                return true;
            }
            break;
        }

    case AL_SUPER_STEREO_WIDTH_SOFT:
        CheckSize(1);
        values[0] = static_cast<T>(Source->EnhWidth);
        return true;

    case AL_BYTE_LENGTH_SOFT:
    case AL_SAMPLE_LENGTH_SOFT:
    case AL_SEC_LENGTH_SOFT:
        CheckSize(1);
        values[0] = GetSourceLength<T>(Source, prop);
        return true;

    case AL_STEREO_ANGLES:
        if constexpr(std::is_floating_point_v<T>)
        {
            CheckSize(2);
            values[0] = static_cast<T>(Source->StereoPan[0]);
            values[1] = static_cast<T>(Source->StereoPan[1]);
            return true;
        }
        break;

    case AL_SAMPLE_OFFSET_LATENCY_SOFT:
        if constexpr(std::is_same_v<T,int64_t>)
        {
            CheckSize(2);
            /* Get the source offset with the clock time first. Then get the
             * clock time with the device latency. Order is important.
             */
            ClockLatency clocktime{};
            nanoseconds srcclock{};
            values[0] = GetSourceSampleOffset(Source, Context, &srcclock);
            {
                std::lock_guard<std::mutex> _{device->StateLock};
                clocktime = GetClockLatency(device, device->Backend.get());
            }
            if(srcclock == clocktime.ClockTime)
                values[1] = nanoseconds{clocktime.Latency}.count();
            else
            {
                /* If the clock time incremented, reduce the latency by that
                 * much since it's that much closer to the source offset it got
                 * earlier.
                 */
                const auto diff = std::min(clocktime.Latency, clocktime.ClockTime-srcclock);
                values[1] = nanoseconds{clocktime.Latency - diff}.count();
            }
            return true;
        }
        break;

    case AL_SAMPLE_OFFSET_CLOCK_SOFT:
        if constexpr(std::is_same_v<T,int64_t>)
        {
            CheckSize(2);
            nanoseconds srcclock{};
            values[0] = GetSourceSampleOffset(Source, Context, &srcclock);
            values[1] = srcclock.count();
            return true;
        }
        break;

    case AL_SEC_OFFSET_LATENCY_SOFT:
        if constexpr(std::is_same_v<T,double>)
        {
            CheckSize(2);
            /* Get the source offset with the clock time first. Then get the
             * clock time with the device latency. Order is important.
             */
            ClockLatency clocktime{};
            nanoseconds srcclock{};
            values[0] = GetSourceSecOffset(Source, Context, &srcclock);
            {
                std::lock_guard<std::mutex> _{device->StateLock};
                clocktime = GetClockLatency(device, device->Backend.get());
            }
            if(srcclock == clocktime.ClockTime)
                values[1] = duration_cast<seconds_d>(clocktime.Latency).count();
            else
            {
                /* If the clock time incremented, reduce the latency by that
                 * much since it's that much closer to the source offset it got
                 * earlier.
                 */
                const auto diff = std::min(clocktime.Latency, clocktime.ClockTime-srcclock);
                values[1] = duration_cast<seconds_d>(clocktime.Latency - diff).count();
            }
            return true;
        }
        break;

    case AL_SEC_OFFSET_CLOCK_SOFT:
        if constexpr(std::is_same_v<T,double>)
        {
            CheckSize(2);
            nanoseconds srcclock{};
            values[0] = GetSourceSecOffset(Source, Context, &srcclock);
            values[1] = duration_cast<seconds_d>(srcclock).count();
            return true;
        }
        break;

    case AL_POSITION:
        CheckSize(3);
        values[0] = static_cast<T>(Source->Position[0]);
        values[1] = static_cast<T>(Source->Position[1]);
        values[2] = static_cast<T>(Source->Position[2]);
        return true;

    case AL_VELOCITY:
        CheckSize(3);
        values[0] = static_cast<T>(Source->Velocity[0]);
        values[1] = static_cast<T>(Source->Velocity[1]);
        values[2] = static_cast<T>(Source->Velocity[2]);
        return true;

    case AL_DIRECTION:
        CheckSize(3);
        values[0] = static_cast<T>(Source->Direction[0]);
        values[1] = static_cast<T>(Source->Direction[1]);
        values[2] = static_cast<T>(Source->Direction[2]);
        return true;

    case AL_ORIENTATION:
        CheckSize(6);
        values[0] = static_cast<T>(Source->OrientAt[0]);
        values[1] = static_cast<T>(Source->OrientAt[1]);
        values[2] = static_cast<T>(Source->OrientAt[2]);
        values[3] = static_cast<T>(Source->OrientUp[0]);
        values[4] = static_cast<T>(Source->OrientUp[1]);
        values[5] = static_cast<T>(Source->OrientUp[2]);
        return true;


    case AL_SOURCE_RELATIVE:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = Source->HeadRelative;
            return true;
        }
        break;

    case AL_LOOPING:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = Source->Looping;
            return true;
        }
        break;

    case AL_BUFFER:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            ALbufferQueueItem *BufferList{};
            /* HACK: This query should technically only return the buffer set
             * on a static source. However, some apps had used it to detect
             * when a streaming source changed buffers, so report the current
             * buffer's ID when playing.
             */
            if(Source->SourceType == AL_STATIC || Source->state == AL_INITIAL)
            {
                if(!Source->mQueue.empty())
                    BufferList = &Source->mQueue.front();
            }
            else if(Voice *voice{GetSourceVoice(Source, Context)})
            {
                VoiceBufferItem *Current{voice->mCurrentBuffer.load(std::memory_order_relaxed)};
                BufferList = static_cast<ALbufferQueueItem*>(Current);
            }
            ALbuffer *buffer{BufferList ? BufferList->mBuffer : nullptr};
            values[0] = buffer ? static_cast<T>(buffer->id) : T{0};
            return true;
        }
        break;

    case AL_SOURCE_STATE:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = GetSourceState(Source, GetSourceVoice(Source, Context));
            return true;
        }
        break;

    case AL_BUFFERS_QUEUED:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = static_cast<T>(Source->mQueue.size());
            return true;
        }
        break;

    case AL_BUFFERS_PROCESSED:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            if(Source->Looping || Source->SourceType != AL_STREAMING)
            {
                /* Buffers on a looping source are in a perpetual state of
                 * PENDING, so don't report any as PROCESSED
                 */
                values[0] = 0;
            }
            else
            {
                int played{0};
                if(Source->state != AL_INITIAL)
                {
                    const VoiceBufferItem *Current{nullptr};
                    if(Voice *voice{GetSourceVoice(Source, Context)})
                        Current = voice->mCurrentBuffer.load(std::memory_order_relaxed);
                    for(auto &item : Source->mQueue)
                    {
                        if(&item == Current)
                            break;
                        ++played;
                    }
                }
                values[0] = played;
            }
            return true;
        }
        break;

    case AL_SOURCE_TYPE:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = Source->SourceType;
            return true;
        }
        break;

    case AL_DIRECT_FILTER_GAINHF_AUTO:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = Source->DryGainHFAuto;
            return true;
        }
        break;

    case AL_AUXILIARY_SEND_FILTER_GAIN_AUTO:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = Source->WetGainAuto;
            return true;
        }
        break;

    case AL_AUXILIARY_SEND_FILTER_GAINHF_AUTO:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = Source->WetGainHFAuto;
            return true;
        }
        break;

    case AL_DIRECT_CHANNELS_SOFT:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = EnumFromDirectMode(Source->DirectChannels);
            return true;
        }
        break;

    case AL_DISTANCE_MODEL:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = ALenumFromDistanceModel(Source->mDistanceModel);
            return true;
        }
        break;

    case AL_SOURCE_RESAMPLER_SOFT:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = static_cast<T>(Source->mResampler);
            return true;
        }
        break;

    case AL_SOURCE_SPATIALIZE_SOFT:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = EnumFromSpatializeMode(Source->mSpatialize);
            return true;
        }
        break;

    case AL_STEREO_MODE_SOFT:
        if constexpr(std::is_integral_v<T>)
        {
            CheckSize(1);
            values[0] = EnumFromStereoMode(Source->mStereoMode);
            return true;
        }
        break;

    case AL_DIRECT_FILTER:
    case AL_AUXILIARY_SEND_FILTER:
        break;
    }

    ERR("Unexpected %s query property: 0x%04x\n", PropType<T>::Name(), prop);
    Context->setError(AL_INVALID_ENUM, "Invalid source %s query property 0x%04x",
        PropType<T>::Name(), prop);
    return false;
}
catch(check_exception&) {
    return false;
}


void StartSources(ALCcontext *const context, const al::span<ALsource*> srchandles,
    const nanoseconds start_time=nanoseconds::min())
{
    ALCdevice *device{context->mALDevice.get()};
    /* If the device is disconnected, and voices stop on disconnect, go right
     * to stopped.
     */
    if(!device->Connected.load(std::memory_order_acquire)) UNLIKELY
    {
        if(context->mStopVoicesOnDisconnect.load(std::memory_order_acquire))
        {
            for(ALsource *source : srchandles)
            {
                /* TODO: Send state change event? */
                source->Offset = 0.0;
                source->OffsetType = AL_NONE;
                source->state = AL_STOPPED;
            }
            return;
        }
    }

    /* Count the number of reusable voices. */
    auto voicelist = context->getVoicesSpan();
    size_t free_voices{0};
    for(const Voice *voice : voicelist)
    {
        free_voices += (voice->mPlayState.load(std::memory_order_acquire) == Voice::Stopped
            && voice->mSourceID.load(std::memory_order_relaxed) == 0u
            && voice->mPendingChange.load(std::memory_order_relaxed) == false);
        if(free_voices == srchandles.size())
            break;
    }
    if(srchandles.size() != free_voices) UNLIKELY
    {
        const size_t inc_amount{srchandles.size() - free_voices};
        auto &allvoices = *context->mVoices.load(std::memory_order_relaxed);
        if(inc_amount > allvoices.size() - voicelist.size())
        {
            /* Increase the number of voices to handle the request. */
            context->allocVoices(inc_amount - (allvoices.size() - voicelist.size()));
        }
        context->mActiveVoiceCount.fetch_add(inc_amount, std::memory_order_release);
        voicelist = context->getVoicesSpan();
    }

    auto voiceiter = voicelist.begin();
    ALuint vidx{0};
    VoiceChange *tail{}, *cur{};
    for(ALsource *source : srchandles)
    {
        /* Check that there is a queue containing at least one valid, non zero
         * length buffer.
         */
        auto find_buffer = [](ALbufferQueueItem &entry) noexcept
        { return entry.mSampleLen != 0 || entry.mCallback != nullptr; };
        auto BufferList = std::find_if(source->mQueue.begin(), source->mQueue.end(), find_buffer);

        /* If there's nothing to play, go right to stopped. */
        if(BufferList == source->mQueue.end()) UNLIKELY
        {
            /* NOTE: A source without any playable buffers should not have a
             * Voice since it shouldn't be in a playing or paused state. So
             * there's no need to look up its voice and clear the source.
             */
            source->Offset = 0.0;
            source->OffsetType = AL_NONE;
            source->state = AL_STOPPED;
            continue;
        }

        if(!cur)
            cur = tail = GetVoiceChanger(context);
        else
        {
            cur->mNext.store(GetVoiceChanger(context), std::memory_order_relaxed);
            cur = cur->mNext.load(std::memory_order_relaxed);
        }

        Voice *voice{GetSourceVoice(source, context)};
        switch(GetSourceState(source, voice))
        {
        case AL_PAUSED:
            /* A source that's paused simply resumes. If there's no voice, it
             * was lost from a disconnect, so just start over with a new one.
             */
            cur->mOldVoice = nullptr;
            if(!voice) break;
            cur->mVoice = voice;
            cur->mSourceID = source->id;
            cur->mState = VChangeState::Play;
            source->state = AL_PLAYING;
#ifdef ALSOFT_EAX
            if(context->hasEax())
                source->eaxCommit();
#endif // ALSOFT_EAX
            continue;

        case AL_PLAYING:
            /* A source that's already playing is restarted from the beginning.
             * Stop the current voice and start a new one so it properly cross-
             * fades back to the beginning.
             */
            if(voice)
                voice->mPendingChange.store(true, std::memory_order_relaxed);
            cur->mOldVoice = voice;
            voice = nullptr;
            break;

        default:
            assert(voice == nullptr);
            cur->mOldVoice = nullptr;
#ifdef ALSOFT_EAX
            if(context->hasEax())
                source->eaxCommit();
#endif // ALSOFT_EAX
            break;
        }

        /* Find the next unused voice to play this source with. */
        for(;voiceiter != voicelist.end();++voiceiter,++vidx)
        {
            Voice *v{*voiceiter};
            if(v->mPlayState.load(std::memory_order_acquire) == Voice::Stopped
                && v->mSourceID.load(std::memory_order_relaxed) == 0u
                && v->mPendingChange.load(std::memory_order_relaxed) == false)
            {
                voice = v;
                break;
            }
        }
        ASSUME(voice != nullptr);

        voice->mPosition.store(0, std::memory_order_relaxed);
        voice->mPositionFrac.store(0, std::memory_order_relaxed);
        voice->mCurrentBuffer.store(&source->mQueue.front(), std::memory_order_relaxed);
        voice->mStartTime = start_time;
        voice->mFlags.reset();
        /* A source that's not playing or paused has any offset applied when it
         * starts playing.
         */
        if(const ALenum offsettype{source->OffsetType})
        {
            const double offset{source->Offset};
            source->OffsetType = AL_NONE;
            source->Offset = 0.0;
            if(auto vpos = GetSampleOffset(source->mQueue, offsettype, offset))
            {
                voice->mPosition.store(vpos->pos, std::memory_order_relaxed);
                voice->mPositionFrac.store(vpos->frac, std::memory_order_relaxed);
                voice->mCurrentBuffer.store(vpos->bufferitem, std::memory_order_relaxed);
                if(vpos->pos > 0 || (vpos->pos == 0 && vpos->frac > 0)
                    || vpos->bufferitem != &source->mQueue.front())
                    voice->mFlags.set(VoiceIsFading);
            }
        }
        InitVoice(voice, source, al::to_address(BufferList), context, device);

        source->VoiceIdx = vidx;
        source->state = AL_PLAYING;

        cur->mVoice = voice;
        cur->mSourceID = source->id;
        cur->mState = VChangeState::Play;
    }
    if(tail) LIKELY
        SendVoiceChanges(context, tail);
}

} // namespace

AL_API DECL_FUNC2(void, alGenSources, ALsizei, ALuint*)
FORCE_ALIGN void AL_APIENTRY alGenSourcesDirect(ALCcontext *context, ALsizei n, ALuint *sources) noexcept
{
    if(n < 0) UNLIKELY
        context->setError(AL_INVALID_VALUE, "Generating %d sources", n);
    if(n <= 0) UNLIKELY return;

    std::unique_lock<std::mutex> srclock{context->mSourceLock};
    ALCdevice *device{context->mALDevice.get()};
    if(static_cast<ALuint>(n) > device->SourcesMax-context->mNumSources)
    {
        context->setError(AL_OUT_OF_MEMORY, "Exceeding %u source limit (%u + %d)",
            device->SourcesMax, context->mNumSources, n);
        return;
    }
    if(!EnsureSources(context, static_cast<ALuint>(n)))
    {
        context->setError(AL_OUT_OF_MEMORY, "Failed to allocate %d source%s", n, (n==1)?"":"s");
        return;
    }

    if(n == 1)
    {
        ALsource *source{AllocSource(context)};
        sources[0] = source->id;

#ifdef ALSOFT_EAX
        source->eaxInitialize(context);
#endif // ALSOFT_EAX
    }
    else
    {
        std::vector<ALuint> ids;
        ids.reserve(static_cast<ALuint>(n));
        do {
            ALsource *source{AllocSource(context)};
            ids.emplace_back(source->id);

#ifdef ALSOFT_EAX
            source->eaxInitialize(context);
#endif // ALSOFT_EAX
        } while(--n);
        std::copy(ids.cbegin(), ids.cend(), sources);
    }
}

AL_API DECL_FUNC2(void, alDeleteSources, ALsizei, const ALuint*)
FORCE_ALIGN void AL_APIENTRY alDeleteSourcesDirect(ALCcontext *context, ALsizei n,
    const ALuint *sources) noexcept
{
    if(n < 0) UNLIKELY
        context->setError(AL_INVALID_VALUE, "Deleting %d sources", n);
    if(n <= 0) UNLIKELY return;

    std::lock_guard<std::mutex> _{context->mSourceLock};

    /* Check that all Sources are valid */
    auto validate_source = [context](const ALuint sid) -> bool
    { return LookupSource(context, sid) != nullptr; };

    const ALuint *sources_end = sources + n;
    auto invsrc = std::find_if_not(sources, sources_end, validate_source);
    if(invsrc != sources_end) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", *invsrc);

    /* All good. Delete source IDs. */
    auto delete_source = [&context](const ALuint sid) -> void
    {
        ALsource *src{LookupSource(context, sid)};
        if(src) FreeSource(context, src);
    };
    std::for_each(sources, sources_end, delete_source);
}

AL_API DECL_FUNC1(ALboolean, alIsSource, ALuint)
FORCE_ALIGN ALboolean AL_APIENTRY alIsSourceDirect(ALCcontext *context, ALuint source) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    if(LookupSource(context, source) != nullptr)
        return AL_TRUE;
    return AL_FALSE;
}


AL_API DECL_FUNC3(void, alSourcef, ALuint, ALenum, ALfloat)
FORCE_ALIGN void AL_APIENTRY alSourcefDirect(ALCcontext *context, ALuint source, ALenum param,
    ALfloat value) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source = LookupSource(context, source);
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    SetProperty<float>(Source, context, static_cast<SourceProp>(param), al::span{&value, 1u});
}

AL_API DECL_FUNC5(void, alSource3f, ALuint, ALenum, ALfloat, ALfloat, ALfloat)
FORCE_ALIGN void AL_APIENTRY alSource3fDirect(ALCcontext *context, ALuint source, ALenum param,
    ALfloat value1, ALfloat value2, ALfloat value3) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source = LookupSource(context, source);
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    const float fvals[3]{ value1, value2, value3 };
    SetProperty<float>(Source, context, static_cast<SourceProp>(param), al::span{fvals});
}

AL_API DECL_FUNC3(void, alSourcefv, ALuint, ALenum, const ALfloat*)
FORCE_ALIGN void AL_APIENTRY alSourcefvDirect(ALCcontext *context, ALuint source, ALenum param,
    const ALfloat *values) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source = LookupSource(context, source);
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!values) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    const ALuint count{FloatValsByProp(param)};
    SetProperty(Source, context, static_cast<SourceProp>(param), al::span{values, count});
}


AL_API DECL_FUNCEXT3(void, alSourced,SOFT, ALuint, ALenum, ALdouble)
FORCE_ALIGN void AL_APIENTRY alSourcedDirectSOFT(ALCcontext *context, ALuint source, ALenum param,
    ALdouble value) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source = LookupSource(context, source);
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    SetProperty<double>(Source, context, static_cast<SourceProp>(param), al::span{&value, 1});
}

AL_API DECL_FUNCEXT5(void, alSource3d,SOFT, ALuint, ALenum, ALdouble, ALdouble, ALdouble)
FORCE_ALIGN void AL_APIENTRY alSource3dDirectSOFT(ALCcontext *context, ALuint source, ALenum param,
    ALdouble value1, ALdouble value2, ALdouble value3) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source = LookupSource(context, source);
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    const double dvals[3]{value1, value2, value3};
    SetProperty<double>(Source, context, static_cast<SourceProp>(param), al::span{dvals});
}

AL_API DECL_FUNCEXT3(void, alSourcedv,SOFT, ALuint, ALenum, const ALdouble*)
FORCE_ALIGN void AL_APIENTRY alSourcedvDirectSOFT(ALCcontext *context, ALuint source, ALenum param,
    const ALdouble *values) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source = LookupSource(context, source);
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!values) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    const ALuint count{DoubleValsByProp(param)};
    SetProperty(Source, context, static_cast<SourceProp>(param), al::span{values, count});
}


AL_API DECL_FUNC3(void, alSourcei, ALuint, ALenum, ALint)
FORCE_ALIGN void AL_APIENTRY alSourceiDirect(ALCcontext *context, ALuint source, ALenum param,
    ALint value) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source = LookupSource(context, source);
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    SetProperty<int>(Source, context, static_cast<SourceProp>(param), al::span{&value, 1u});
}

AL_API DECL_FUNC5(void, alSource3i, ALuint, ALenum, ALint, ALint, ALint)
FORCE_ALIGN void AL_APIENTRY alSource3iDirect(ALCcontext *context, ALuint source, ALenum param,
    ALint value1, ALint value2, ALint value3) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source = LookupSource(context, source);
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    const int ivals[3]{ value1, value2, value3 };
    SetProperty<int>(Source, context, static_cast<SourceProp>(param), al::span{ivals});
}

AL_API DECL_FUNC3(void, alSourceiv, ALuint, ALenum, const ALint*)
FORCE_ALIGN void AL_APIENTRY alSourceivDirect(ALCcontext *context, ALuint source, ALenum param,
    const ALint *values) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source = LookupSource(context, source);
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!values) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    const ALuint count{IntValsByProp(param)};
    SetProperty(Source, context, static_cast<SourceProp>(param), al::span{values, count});
}


AL_API DECL_FUNCEXT3(void, alSourcei64,SOFT, ALuint, ALenum, ALint64SOFT)
FORCE_ALIGN void AL_APIENTRY alSourcei64DirectSOFT(ALCcontext *context, ALuint source,
    ALenum param, ALint64SOFT value) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    SetProperty<int64_t>(Source, context, static_cast<SourceProp>(param), al::span{&value, 1u});
}

AL_API DECL_FUNCEXT5(void, alSource3i64,SOFT, ALuint, ALenum, ALint64SOFT, ALint64SOFT, ALint64SOFT)
FORCE_ALIGN void AL_APIENTRY alSource3i64DirectSOFT(ALCcontext *context, ALuint source,
    ALenum param, ALint64SOFT value1, ALint64SOFT value2, ALint64SOFT value3) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    const int64_t i64vals[3]{ value1, value2, value3 };
    SetProperty<int64_t>(Source, context, static_cast<SourceProp>(param), al::span{i64vals});
}

AL_API DECL_FUNCEXT3(void, alSourcei64v,SOFT, ALuint, ALenum, const ALint64SOFT*)
FORCE_ALIGN void AL_APIENTRY alSourcei64vDirectSOFT(ALCcontext *context, ALuint source,
    ALenum param, const ALint64SOFT *values) noexcept
{
    std::lock_guard<std::mutex> _{context->mPropLock};
    std::lock_guard<std::mutex> __{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!values) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    const ALuint count{Int64ValsByProp(param)};
    SetProperty(Source, context, static_cast<SourceProp>(param), al::span{values, count});
}


AL_API DECL_FUNC3(void, alGetSourcef, ALuint, ALenum, ALfloat*)
FORCE_ALIGN void AL_APIENTRY alGetSourcefDirect(ALCcontext *context, ALuint source, ALenum param,
    ALfloat *value) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!value) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    std::ignore = GetProperty(Source, context, static_cast<SourceProp>(param), al::span{value, 1});
}

AL_API DECL_FUNC5(void, alGetSource3f, ALuint, ALenum, ALfloat*, ALfloat*, ALfloat*)
FORCE_ALIGN void AL_APIENTRY alGetSource3fDirect(ALCcontext *context, ALuint source, ALenum param,
    ALfloat *value1, ALfloat *value2, ALfloat *value3) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!(value1 && value2 && value3)) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    float fvals[3];
    if(GetProperty<float>(Source, context, static_cast<SourceProp>(param), al::span{fvals}))
    {
        *value1 = fvals[0];
        *value2 = fvals[1];
        *value3 = fvals[2];
    }
}

AL_API DECL_FUNC3(void, alGetSourcefv, ALuint, ALenum, ALfloat*)
FORCE_ALIGN void AL_APIENTRY alGetSourcefvDirect(ALCcontext *context, ALuint source, ALenum param,
    ALfloat *values) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!values) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    const ALuint count{FloatValsByProp(param)};
    std::ignore = GetProperty(Source, context, static_cast<SourceProp>(param),
        al::span{values, count});
}


AL_API DECL_FUNCEXT3(void, alGetSourced,SOFT, ALuint, ALenum, ALdouble*)
FORCE_ALIGN void AL_APIENTRY alGetSourcedDirectSOFT(ALCcontext *context, ALuint source,
    ALenum param, ALdouble *value) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!value) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    std::ignore = GetProperty(Source, context, static_cast<SourceProp>(param), al::span{value, 1});
}

AL_API DECL_FUNCEXT5(void, alGetSource3d,SOFT, ALuint, ALenum, ALdouble*, ALdouble*, ALdouble*)
FORCE_ALIGN void AL_APIENTRY alGetSource3dDirectSOFT(ALCcontext *context, ALuint source,
    ALenum param, ALdouble *value1, ALdouble *value2, ALdouble *value3) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!(value1 && value2 && value3)) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    double dvals[3];
    if(GetProperty<double>(Source, context, static_cast<SourceProp>(param), al::span{dvals}))
    {
        *value1 = dvals[0];
        *value2 = dvals[1];
        *value3 = dvals[2];
    }
}

AL_API DECL_FUNCEXT3(void, alGetSourcedv,SOFT, ALuint, ALenum, ALdouble*)
FORCE_ALIGN void AL_APIENTRY alGetSourcedvDirectSOFT(ALCcontext *context, ALuint source,
    ALenum param, ALdouble *values) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!values) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    const ALuint count{DoubleValsByProp(param)};
    std::ignore = GetProperty(Source, context, static_cast<SourceProp>(param),
        al::span{values, count});
}


AL_API DECL_FUNC3(void, alGetSourcei, ALuint, ALenum, ALint*)
FORCE_ALIGN void AL_APIENTRY alGetSourceiDirect(ALCcontext *context, ALuint source, ALenum param,
    ALint *value) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!value) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    std::ignore = GetProperty(Source, context, static_cast<SourceProp>(param), al::span{value, 1});
}

AL_API DECL_FUNC5(void, alGetSource3i, ALuint, ALenum, ALint*, ALint*, ALint*)
FORCE_ALIGN void AL_APIENTRY alGetSource3iDirect(ALCcontext *context, ALuint source, ALenum param,
    ALint *value1, ALint *value2, ALint *value3) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!(value1 && value2 && value3)) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");
    
    int ivals[3];
    if(GetProperty<int>(Source, context, static_cast<SourceProp>(param), al::span{ivals}))
    {
        *value1 = ivals[0];
        *value2 = ivals[1];
        *value3 = ivals[2];
    }
}

AL_API DECL_FUNC3(void, alGetSourceiv, ALuint, ALenum, ALint*)
FORCE_ALIGN void AL_APIENTRY alGetSourceivDirect(ALCcontext *context, ALuint source, ALenum param,
    ALint *values) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!values) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    const ALuint count{IntValsByProp(param)};
    std::ignore = GetProperty(Source, context, static_cast<SourceProp>(param),
        al::span{values, count});
}


AL_API DECL_FUNCEXT3(void, alGetSourcei64,SOFT, ALuint, ALenum, ALint64SOFT*)
FORCE_ALIGN void AL_APIENTRY alGetSourcei64DirectSOFT(ALCcontext *context, ALuint source, ALenum param, ALint64SOFT *value) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!value) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    std::ignore = GetProperty(Source, context, static_cast<SourceProp>(param), al::span{value, 1});
}

AL_API DECL_FUNCEXT5(void, alGetSource3i64,SOFT, ALuint, ALenum, ALint64SOFT*, ALint64SOFT*, ALint64SOFT*)
FORCE_ALIGN void AL_APIENTRY alGetSource3i64DirectSOFT(ALCcontext *context, ALuint source,
    ALenum param, ALint64SOFT *value1, ALint64SOFT *value2, ALint64SOFT *value3) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!(value1 && value2 && value3)) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    int64_t i64vals[3];
    if(GetProperty<int64_t>(Source, context, static_cast<SourceProp>(param), al::span{i64vals}))
    {
        *value1 = i64vals[0];
        *value2 = i64vals[1];
        *value3 = i64vals[2];
    }
}

AL_API DECL_FUNCEXT3(void, alGetSourcei64v,SOFT, ALuint, ALenum, ALint64SOFT*)
FORCE_ALIGN void AL_APIENTRY alGetSourcei64vDirectSOFT(ALCcontext *context, ALuint source,
    ALenum param, ALint64SOFT *values) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *Source{LookupSource(context, source)};
    if(!Source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);
    if(!values) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "NULL pointer");

    const ALuint count{Int64ValsByProp(param)};
    std::ignore = GetProperty(Source, context, static_cast<SourceProp>(param),
        al::span{values, count});
}


AL_API DECL_FUNC1(void, alSourcePlay, ALuint)
FORCE_ALIGN void AL_APIENTRY alSourcePlayDirect(ALCcontext *context, ALuint source) noexcept
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *srchandle{LookupSource(context, source)};
    if(!srchandle)
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    StartSources(context, {&srchandle, 1});
}

FORCE_ALIGN DECL_FUNCEXT2(void, alSourcePlayAtTime,SOFT, ALuint, ALint64SOFT)
FORCE_ALIGN void AL_APIENTRY alSourcePlayAtTimeDirectSOFT(ALCcontext *context, ALuint source,
    ALint64SOFT start_time) noexcept
{
    if(start_time < 0) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "Invalid time point %" PRId64, start_time);

    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *srchandle{LookupSource(context, source)};
    if(!srchandle)
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", source);

    StartSources(context, {&srchandle, 1}, nanoseconds{start_time});
}

AL_API DECL_FUNC2(void, alSourcePlayv, ALsizei, const ALuint*)
FORCE_ALIGN void AL_APIENTRY alSourcePlayvDirect(ALCcontext *context, ALsizei n,
    const ALuint *sources) noexcept
{
    if(n < 0) UNLIKELY
        context->setError(AL_INVALID_VALUE, "Playing %d sources", n);
    if(n <= 0) UNLIKELY return;

    std::vector<ALsource*> extra_sources;
    std::array<ALsource*,8> source_storage;
    al::span<ALsource*> srchandles;
    if(static_cast<ALuint>(n) <= source_storage.size()) LIKELY
        srchandles = al::span{source_storage}.first(static_cast<ALuint>(n));
    else
    {
        extra_sources.resize(static_cast<ALuint>(n));
        srchandles = extra_sources;
    }

    std::lock_guard<std::mutex> _{context->mSourceLock};
    for(auto &srchdl : srchandles)
    {
        srchdl = LookupSource(context, *sources);
        if(!srchdl) UNLIKELY
            return context->setError(AL_INVALID_NAME, "Invalid source ID %u", *sources);
        ++sources;
    }

    StartSources(context, srchandles);
}

FORCE_ALIGN DECL_FUNCEXT3(void, alSourcePlayAtTimev,SOFT, ALsizei, const ALuint*, ALint64SOFT)
FORCE_ALIGN void AL_APIENTRY alSourcePlayAtTimevDirectSOFT(ALCcontext *context, ALsizei n,
    const ALuint *sources, ALint64SOFT start_time) noexcept
{
    if(n < 0) UNLIKELY
        context->setError(AL_INVALID_VALUE, "Playing %d sources", n);
    if(n <= 0) UNLIKELY return;

    if(start_time < 0) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "Invalid time point %" PRId64, start_time);

    std::vector<ALsource*> extra_sources;
    std::array<ALsource*,8> source_storage;
    al::span<ALsource*> srchandles;
    if(static_cast<ALuint>(n) <= source_storage.size()) LIKELY
        srchandles = al::span{source_storage}.first(static_cast<ALuint>(n));
    else
    {
        extra_sources.resize(static_cast<ALuint>(n));
        srchandles = extra_sources;
    }

    std::lock_guard<std::mutex> _{context->mSourceLock};
    for(auto &srchdl : srchandles)
    {
        srchdl = LookupSource(context, *sources);
        if(!srchdl)
            return context->setError(AL_INVALID_NAME, "Invalid source ID %u", *sources);
        ++sources;
    }

    StartSources(context, srchandles, nanoseconds{start_time});
}


AL_API DECL_FUNC1(void, alSourcePause, ALuint)
FORCE_ALIGN void AL_APIENTRY alSourcePauseDirect(ALCcontext *context, ALuint source) noexcept
{ alSourcePausevDirect(context, 1, &source); }

AL_API DECL_FUNC2(void, alSourcePausev, ALsizei, const ALuint*)
FORCE_ALIGN void AL_APIENTRY alSourcePausevDirect(ALCcontext *context, ALsizei n,
    const ALuint *sources) noexcept
{
    if(n < 0) UNLIKELY
        context->setError(AL_INVALID_VALUE, "Pausing %d sources", n);
    if(n <= 0) UNLIKELY return;

    std::vector<ALsource*> extra_sources;
    std::array<ALsource*,8> source_storage;
    al::span<ALsource*> srchandles;
    if(static_cast<ALuint>(n) <= source_storage.size()) LIKELY
        srchandles = al::span{source_storage}.first(static_cast<ALuint>(n));
    else
    {
        extra_sources.resize(static_cast<ALuint>(n));
        srchandles = extra_sources;
    }

    std::lock_guard<std::mutex> _{context->mSourceLock};
    for(auto &srchdl : srchandles)
    {
        srchdl = LookupSource(context, *sources);
        if(!srchdl)
            return context->setError(AL_INVALID_NAME, "Invalid source ID %u", *sources);
        ++sources;
    }

    /* Pausing has to be done in two steps. First, for each source that's
     * detected to be playing, chamge the voice (asynchronously) to
     * stopping/paused.
     */
    VoiceChange *tail{}, *cur{};
    for(ALsource *source : srchandles)
    {
        Voice *voice{GetSourceVoice(source, context)};
        if(GetSourceState(source, voice) == AL_PLAYING)
        {
            if(!cur)
                cur = tail = GetVoiceChanger(context);
            else
            {
                cur->mNext.store(GetVoiceChanger(context), std::memory_order_relaxed);
                cur = cur->mNext.load(std::memory_order_relaxed);
            }
            cur->mVoice = voice;
            cur->mSourceID = source->id;
            cur->mState = VChangeState::Pause;
        }
    }
    if(tail) LIKELY
    {
        SendVoiceChanges(context, tail);
        /* Second, now that the voice changes have been sent, because it's
         * possible that the voice stopped after it was detected playing and
         * before the voice got paused, recheck that the source is still
         * considered playing and set it to paused if so.
         */
        for(ALsource *source : srchandles)
        {
            Voice *voice{GetSourceVoice(source, context)};
            if(GetSourceState(source, voice) == AL_PLAYING)
                source->state = AL_PAUSED;
        }
    }
}


AL_API DECL_FUNC1(void, alSourceStop, ALuint)
FORCE_ALIGN void AL_APIENTRY alSourceStopDirect(ALCcontext *context, ALuint source) noexcept
{ alSourceStopvDirect(context, 1, &source); }

AL_API DECL_FUNC2(void, alSourceStopv, ALsizei, const ALuint*)
FORCE_ALIGN void AL_APIENTRY alSourceStopvDirect(ALCcontext *context, ALsizei n,
    const ALuint *sources) noexcept
{
    if(n < 0) UNLIKELY
        context->setError(AL_INVALID_VALUE, "Stopping %d sources", n);
    if(n <= 0) UNLIKELY return;

    std::vector<ALsource*> extra_sources;
    std::array<ALsource*,8> source_storage;
    al::span<ALsource*> srchandles;
    if(static_cast<ALuint>(n) <= source_storage.size()) LIKELY
        srchandles = al::span{source_storage}.first(static_cast<ALuint>(n));
    else
    {
        extra_sources.resize(static_cast<ALuint>(n));
        srchandles = extra_sources;
    }

    std::lock_guard<std::mutex> _{context->mSourceLock};
    for(auto &srchdl : srchandles)
    {
        srchdl = LookupSource(context, *sources);
        if(!srchdl)
            return context->setError(AL_INVALID_NAME, "Invalid source ID %u", *sources);
        ++sources;
    }

    VoiceChange *tail{}, *cur{};
    for(ALsource *source : srchandles)
    {
        if(Voice *voice{GetSourceVoice(source, context)})
        {
            if(!cur)
                cur = tail = GetVoiceChanger(context);
            else
            {
                cur->mNext.store(GetVoiceChanger(context), std::memory_order_relaxed);
                cur = cur->mNext.load(std::memory_order_relaxed);
            }
            voice->mPendingChange.store(true, std::memory_order_relaxed);
            cur->mVoice = voice;
            cur->mSourceID = source->id;
            cur->mState = VChangeState::Stop;
            source->state = AL_STOPPED;
        }
        source->Offset = 0.0;
        source->OffsetType = AL_NONE;
        source->VoiceIdx = INVALID_VOICE_IDX;
    }
    if(tail) LIKELY
        SendVoiceChanges(context, tail);
}


AL_API DECL_FUNC1(void, alSourceRewind, ALuint)
FORCE_ALIGN void AL_APIENTRY alSourceRewindDirect(ALCcontext *context, ALuint source) noexcept
{ alSourceRewindvDirect(context, 1, &source); }

AL_API DECL_FUNC2(void, alSourceRewindv, ALsizei, const ALuint*)
FORCE_ALIGN void AL_APIENTRY alSourceRewindvDirect(ALCcontext *context, ALsizei n,
    const ALuint *sources) noexcept
{
    if(n < 0) UNLIKELY
        context->setError(AL_INVALID_VALUE, "Rewinding %d sources", n);
    if(n <= 0) UNLIKELY return;

    std::vector<ALsource*> extra_sources;
    std::array<ALsource*,8> source_storage;
    al::span<ALsource*> srchandles;
    if(static_cast<ALuint>(n) <= source_storage.size()) LIKELY
        srchandles = al::span{source_storage}.first(static_cast<ALuint>(n));
    else
    {
        extra_sources.resize(static_cast<ALuint>(n));
        srchandles = extra_sources;
    }

    std::lock_guard<std::mutex> _{context->mSourceLock};
    for(auto &srchdl : srchandles)
    {
        srchdl = LookupSource(context, *sources);
        if(!srchdl)
            return context->setError(AL_INVALID_NAME, "Invalid source ID %u", *sources);
        ++sources;
    }

    VoiceChange *tail{}, *cur{};
    for(ALsource *source : srchandles)
    {
        Voice *voice{GetSourceVoice(source, context)};
        if(source->state != AL_INITIAL)
        {
            if(!cur)
                cur = tail = GetVoiceChanger(context);
            else
            {
                cur->mNext.store(GetVoiceChanger(context), std::memory_order_relaxed);
                cur = cur->mNext.load(std::memory_order_relaxed);
            }
            if(voice)
                voice->mPendingChange.store(true, std::memory_order_relaxed);
            cur->mVoice = voice;
            cur->mSourceID = source->id;
            cur->mState = VChangeState::Reset;
            source->state = AL_INITIAL;
        }
        source->Offset = 0.0;
        source->OffsetType = AL_NONE;
        source->VoiceIdx = INVALID_VOICE_IDX;
    }
    if(tail) LIKELY
        SendVoiceChanges(context, tail);
}


AL_API DECL_FUNC3(void, alSourceQueueBuffers, ALuint, ALsizei, const ALuint*)
FORCE_ALIGN void AL_APIENTRY alSourceQueueBuffersDirect(ALCcontext *context, ALuint src,
    ALsizei nb, const ALuint *buffers) noexcept
{
    if(nb < 0) UNLIKELY
        context->setError(AL_INVALID_VALUE, "Queueing %d buffers", nb);
    if(nb <= 0) UNLIKELY return;

    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *source{LookupSource(context,src)};
    if(!source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", src);

    /* Can't queue on a Static Source */
    if(source->SourceType == AL_STATIC) UNLIKELY
        return context->setError(AL_INVALID_OPERATION, "Queueing onto static source %u", src);

    /* Check for a valid Buffer, for its frequency and format */
    ALCdevice *device{context->mALDevice.get()};
    ALbuffer *BufferFmt{nullptr};
    for(auto &item : source->mQueue)
    {
        BufferFmt = item.mBuffer;
        if(BufferFmt) break;
    }

    std::unique_lock<std::mutex> buflock{device->BufferLock};
    const size_t NewListStart{source->mQueue.size()};
    ALbufferQueueItem *BufferList{nullptr};
    for(ALsizei i{0};i < nb;i++)
    {
        bool fmt_mismatch{false};
        ALbuffer *buffer{nullptr};
        if(buffers[i] && (buffer=LookupBuffer(device, buffers[i])) == nullptr)
        {
            context->setError(AL_INVALID_NAME, "Queueing invalid buffer ID %u", buffers[i]);
            goto buffer_error;
        }
        if(buffer)
        {
            if(buffer->mSampleRate < 1)
            {
                context->setError(AL_INVALID_OPERATION, "Queueing buffer %u with no format",
                    buffer->id);
                goto buffer_error;
            }
            if(buffer->mCallback)
            {
                context->setError(AL_INVALID_OPERATION, "Queueing callback buffer %u", buffer->id);
                goto buffer_error;
            }
            if(buffer->MappedAccess != 0 && !(buffer->MappedAccess&AL_MAP_PERSISTENT_BIT_SOFT))
            {
                context->setError(AL_INVALID_OPERATION,
                    "Queueing non-persistently mapped buffer %u", buffer->id);
                goto buffer_error;
            }
        }

        source->mQueue.emplace_back();
        if(!BufferList)
            BufferList = &source->mQueue.back();
        else
        {
            auto &item = source->mQueue.back();
            BufferList->mNext.store(&item, std::memory_order_relaxed);
            BufferList = &item;
        }
        if(!buffer) continue;
        BufferList->mBlockAlign = buffer->mBlockAlign;
        BufferList->mSampleLen = buffer->mSampleLen;
        BufferList->mLoopEnd = buffer->mSampleLen;
        BufferList->mSamples = buffer->mData.data();
        BufferList->mBuffer = buffer;
        IncrementRef(buffer->ref);

        if(BufferFmt == nullptr)
            BufferFmt = buffer;
        else
        {
            fmt_mismatch |= BufferFmt->mSampleRate != buffer->mSampleRate;
            fmt_mismatch |= BufferFmt->mChannels != buffer->mChannels;
            fmt_mismatch |= BufferFmt->mType != buffer->mType;
            if(BufferFmt->isBFormat())
            {
                fmt_mismatch |= BufferFmt->mAmbiLayout != buffer->mAmbiLayout;
                fmt_mismatch |= BufferFmt->mAmbiScaling != buffer->mAmbiScaling;
            }
            fmt_mismatch |= BufferFmt->mAmbiOrder != buffer->mAmbiOrder;
        }
        if(fmt_mismatch) UNLIKELY
        {
            context->setError(AL_INVALID_OPERATION, "Queueing buffer with mismatched format\n"
                "  Expected: %uhz, %s, %s ; Got: %uhz, %s, %s\n", BufferFmt->mSampleRate,
                NameFromFormat(BufferFmt->mType), NameFromFormat(BufferFmt->mChannels),
                buffer->mSampleRate, NameFromFormat(buffer->mType),
                NameFromFormat(buffer->mChannels));

        buffer_error:
            /* A buffer failed (invalid ID or format), so unlock and release
             * each buffer we had.
             */
            auto iter = source->mQueue.begin() + ptrdiff_t(NewListStart);
            for(;iter != source->mQueue.end();++iter)
            {
                if(ALbuffer *buf{iter->mBuffer})
                    DecrementRef(buf->ref);
            }
            source->mQueue.resize(NewListStart);
            return;
        }
    }
    /* All buffers good. */
    buflock.unlock();

    /* Source is now streaming */
    source->SourceType = AL_STREAMING;

    if(NewListStart != 0)
    {
        auto iter = source->mQueue.begin() + ptrdiff_t(NewListStart);
        (iter-1)->mNext.store(al::to_address(iter), std::memory_order_release);
    }
}

AL_API DECL_FUNC3(void, alSourceUnqueueBuffers, ALuint, ALsizei, ALuint*)
FORCE_ALIGN void AL_APIENTRY alSourceUnqueueBuffersDirect(ALCcontext *context, ALuint src,
    ALsizei nb, ALuint *buffers) noexcept
{
    if(nb < 0) UNLIKELY
        context->setError(AL_INVALID_VALUE, "Unqueueing %d buffers", nb);
    if(nb <= 0) UNLIKELY return;

    std::lock_guard<std::mutex> _{context->mSourceLock};
    ALsource *source{LookupSource(context,src)};
    if(!source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", src);

    if(source->SourceType != AL_STREAMING) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "Unqueueing from a non-streaming source %u",
            src);
    if(source->Looping) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "Unqueueing from looping source %u", src);

    /* Make sure enough buffers have been processed to unqueue. */
    uint processed{0u};
    if(source->state != AL_INITIAL) LIKELY
    {
        VoiceBufferItem *Current{nullptr};
        if(Voice *voice{GetSourceVoice(source, context)})
            Current = voice->mCurrentBuffer.load(std::memory_order_relaxed);
        for(auto &item : source->mQueue)
        {
            if(&item == Current)
                break;
            ++processed;
        }
    }
    if(processed < static_cast<ALuint>(nb)) UNLIKELY
        return context->setError(AL_INVALID_VALUE, "Unqueueing %d buffer%s (only %u processed)",
            nb, (nb==1)?"":"s", processed);

    do {
        auto &head = source->mQueue.front();
        if(ALbuffer *buffer{head.mBuffer})
        {
            *(buffers++) = buffer->id;
            DecrementRef(buffer->ref);
        }
        else
            *(buffers++) = 0;
        source->mQueue.pop_front();
    } while(--nb);
}


AL_API void AL_APIENTRY alSourceQueueBufferLayersSOFT(ALuint, ALsizei, const ALuint*) noexcept
{
    ContextRef context{GetContextRef()};
    if(!context) UNLIKELY return;

    context->setError(AL_INVALID_OPERATION, "alSourceQueueBufferLayersSOFT not supported");
}


ALsource::ALsource()
{
    Direct.Gain = 1.0f;
    Direct.GainHF = 1.0f;
    Direct.HFReference = LOWPASSFREQREF;
    Direct.GainLF = 1.0f;
    Direct.LFReference = HIGHPASSFREQREF;
    for(auto &send : Send)
    {
        send.Slot = nullptr;
        send.Gain = 1.0f;
        send.GainHF = 1.0f;
        send.HFReference = LOWPASSFREQREF;
        send.GainLF = 1.0f;
        send.LFReference = HIGHPASSFREQREF;
    }
}

ALsource::~ALsource()
{
    for(auto &item : mQueue)
    {
        if(ALbuffer *buffer{item.mBuffer})
            DecrementRef(buffer->ref);
    }

    auto clear_send = [](ALsource::SendData &send) -> void
    { if(send.Slot) DecrementRef(send.Slot->ref); };
    std::for_each(Send.begin(), Send.end(), clear_send);
}

void UpdateAllSourceProps(ALCcontext *context)
{
    std::lock_guard<std::mutex> _{context->mSourceLock};
    auto voicelist = context->getVoicesSpan();
    ALuint vidx{0u};
    for(Voice *voice : voicelist)
    {
        ALuint sid{voice->mSourceID.load(std::memory_order_acquire)};
        ALsource *source = sid ? LookupSource(context, sid) : nullptr;
        if(source && source->VoiceIdx == vidx)
        {
            if(std::exchange(source->mPropsDirty, false))
                UpdateSourceProps(source, voice, context);
        }
        ++vidx;
    }
}

void ALsource::SetName(ALCcontext *context, ALuint id, std::string_view name)
{
    std::lock_guard<std::mutex> _{context->mSourceLock};

    auto source = LookupSource(context, id);
    if(!source) UNLIKELY
        return context->setError(AL_INVALID_NAME, "Invalid source ID %u", id);

    context->mSourceNames.insert_or_assign(id, name);
}


SourceSubList::~SourceSubList()
{
    if(!Sources)
        return;

    uint64_t usemask{~FreeMask};
    while(usemask)
    {
        const int idx{al::countr_zero(usemask)};
        usemask &= ~(1_u64 << idx);
        std::destroy_at(Sources+idx);
    }
    FreeMask = ~usemask;
    al_free(Sources);
    Sources = nullptr;
}


#ifdef ALSOFT_EAX
constexpr const ALsource::EaxFxSlotIds ALsource::eax4_fx_slot_ids;
constexpr const ALsource::EaxFxSlotIds ALsource::eax5_fx_slot_ids;

void ALsource::eaxInitialize(ALCcontext *context) noexcept
{
    assert(context != nullptr);
    mEaxAlContext = context;

    mEaxPrimaryFxSlotId = context->eaxGetPrimaryFxSlotIndex();
    eax_set_defaults();

    eax1_translate(mEax1.i, mEax);
    mEaxVersion = 1;
    mEaxChanged = true;
}

void ALsource::eaxDispatch(const EaxCall& call)
{
    call.is_get() ? eax_get(call) : eax_set(call);
}

ALsource* ALsource::EaxLookupSource(ALCcontext& al_context, ALuint source_id) noexcept
{
    return LookupSource(&al_context, source_id);
}

[[noreturn]] void ALsource::eax_fail(const char* message)
{
    throw Exception{message};
}

[[noreturn]] void ALsource::eax_fail_unknown_property_id()
{
    eax_fail("Unknown property id.");
}

[[noreturn]] void ALsource::eax_fail_unknown_version()
{
    eax_fail("Unknown version.");
}

[[noreturn]] void ALsource::eax_fail_unknown_active_fx_slot_id()
{
    eax_fail("Unknown active FX slot ID.");
}

[[noreturn]] void ALsource::eax_fail_unknown_receiving_fx_slot_id()
{
    eax_fail("Unknown receiving FX slot ID.");
}

void ALsource::eax_set_sends_defaults(EaxSends& sends, const EaxFxSlotIds& ids) noexcept
{
    for(size_t i{0};i < EAX_MAX_FXSLOTS;++i)
    {
        auto& send = sends[i];
        send.guidReceivingFXSlotID = *(ids[i]);
        send.lSend = EAXSOURCE_DEFAULTSEND;
        send.lSendHF = EAXSOURCE_DEFAULTSENDHF;
        send.lOcclusion = EAXSOURCE_DEFAULTOCCLUSION;
        send.flOcclusionLFRatio = EAXSOURCE_DEFAULTOCCLUSIONLFRATIO;
        send.flOcclusionRoomRatio = EAXSOURCE_DEFAULTOCCLUSIONROOMRATIO;
        send.flOcclusionDirectRatio = EAXSOURCE_DEFAULTOCCLUSIONDIRECTRATIO;
        send.lExclusion = EAXSOURCE_DEFAULTEXCLUSION;
        send.flExclusionLFRatio = EAXSOURCE_DEFAULTEXCLUSIONLFRATIO;
    }
}

void ALsource::eax1_set_defaults(Eax1Props& props) noexcept
{
    props.fMix = EAX_REVERBMIX_USEDISTANCE;
}

void ALsource::eax1_set_defaults() noexcept
{
    eax1_set_defaults(mEax1.i);
    mEax1.d = mEax1.i;
}

void ALsource::eax2_set_defaults(Eax2Props& props) noexcept
{
    props.lDirect = EAXSOURCE_DEFAULTDIRECT;
    props.lDirectHF = EAXSOURCE_DEFAULTDIRECTHF;
    props.lRoom = EAXSOURCE_DEFAULTROOM;
    props.lRoomHF = EAXSOURCE_DEFAULTROOMHF;
    props.flRoomRolloffFactor = EAXSOURCE_DEFAULTROOMROLLOFFFACTOR;
    props.lObstruction = EAXSOURCE_DEFAULTOBSTRUCTION;
    props.flObstructionLFRatio = EAXSOURCE_DEFAULTOBSTRUCTIONLFRATIO;
    props.lOcclusion = EAXSOURCE_DEFAULTOCCLUSION;
    props.flOcclusionLFRatio = EAXSOURCE_DEFAULTOCCLUSIONLFRATIO;
    props.flOcclusionRoomRatio = EAXSOURCE_DEFAULTOCCLUSIONROOMRATIO;
    props.lOutsideVolumeHF = EAXSOURCE_DEFAULTOUTSIDEVOLUMEHF;
    props.flAirAbsorptionFactor = EAXSOURCE_DEFAULTAIRABSORPTIONFACTOR;
    props.dwFlags = EAXSOURCE_DEFAULTFLAGS;
}

void ALsource::eax2_set_defaults() noexcept
{
    eax2_set_defaults(mEax2.i);
    mEax2.d = mEax2.i;
}

void ALsource::eax3_set_defaults(Eax3Props& props) noexcept
{
    props.lDirect = EAXSOURCE_DEFAULTDIRECT;
    props.lDirectHF = EAXSOURCE_DEFAULTDIRECTHF;
    props.lRoom = EAXSOURCE_DEFAULTROOM;
    props.lRoomHF = EAXSOURCE_DEFAULTROOMHF;
    props.lObstruction = EAXSOURCE_DEFAULTOBSTRUCTION;
    props.flObstructionLFRatio = EAXSOURCE_DEFAULTOBSTRUCTIONLFRATIO;
    props.lOcclusion = EAXSOURCE_DEFAULTOCCLUSION;
    props.flOcclusionLFRatio = EAXSOURCE_DEFAULTOCCLUSIONLFRATIO;
    props.flOcclusionRoomRatio = EAXSOURCE_DEFAULTOCCLUSIONROOMRATIO;
    props.flOcclusionDirectRatio = EAXSOURCE_DEFAULTOCCLUSIONDIRECTRATIO;
    props.lExclusion = EAXSOURCE_DEFAULTEXCLUSION;
    props.flExclusionLFRatio = EAXSOURCE_DEFAULTEXCLUSIONLFRATIO;
    props.lOutsideVolumeHF = EAXSOURCE_DEFAULTOUTSIDEVOLUMEHF;
    props.flDopplerFactor = EAXSOURCE_DEFAULTDOPPLERFACTOR;
    props.flRolloffFactor = EAXSOURCE_DEFAULTROLLOFFFACTOR;
    props.flRoomRolloffFactor = EAXSOURCE_DEFAULTROOMROLLOFFFACTOR;
    props.flAirAbsorptionFactor = EAXSOURCE_DEFAULTAIRABSORPTIONFACTOR;
    props.ulFlags = EAXSOURCE_DEFAULTFLAGS;
}

void ALsource::eax3_set_defaults() noexcept
{
    eax3_set_defaults(mEax3.i);
    mEax3.d = mEax3.i;
}

void ALsource::eax4_set_sends_defaults(EaxSends& sends) noexcept
{
    eax_set_sends_defaults(sends, eax4_fx_slot_ids);
}

void ALsource::eax4_set_active_fx_slots_defaults(EAX40ACTIVEFXSLOTS& slots) noexcept
{
    slots = EAX40SOURCE_DEFAULTACTIVEFXSLOTID;
}

void ALsource::eax4_set_defaults() noexcept
{
    eax3_set_defaults(mEax4.i.source);
    eax4_set_sends_defaults(mEax4.i.sends);
    eax4_set_active_fx_slots_defaults(mEax4.i.active_fx_slots);
    mEax4.d = mEax4.i;
}

void ALsource::eax5_set_source_defaults(EAX50SOURCEPROPERTIES& props) noexcept
{
    eax3_set_defaults(static_cast<Eax3Props&>(props));
    props.flMacroFXFactor = EAXSOURCE_DEFAULTMACROFXFACTOR;
}

void ALsource::eax5_set_sends_defaults(EaxSends& sends) noexcept
{
    eax_set_sends_defaults(sends, eax5_fx_slot_ids);
}

void ALsource::eax5_set_active_fx_slots_defaults(EAX50ACTIVEFXSLOTS& slots) noexcept
{
    slots = EAX50SOURCE_3DDEFAULTACTIVEFXSLOTID;
}

void ALsource::eax5_set_speaker_levels_defaults(EaxSpeakerLevels& speaker_levels) noexcept
{
    for(size_t i{0};i < eax_max_speakers;++i)
    {
        auto& speaker_level = speaker_levels[i];
        speaker_level.lSpeakerID = static_cast<long>(EAXSPEAKER_FRONT_LEFT + i);
        speaker_level.lLevel = EAXSOURCE_DEFAULTSPEAKERLEVEL;
    }
}

void ALsource::eax5_set_defaults(Eax5Props& props) noexcept
{
    eax5_set_source_defaults(props.source);
    eax5_set_sends_defaults(props.sends);
    eax5_set_active_fx_slots_defaults(props.active_fx_slots);
    eax5_set_speaker_levels_defaults(props.speaker_levels);
}

void ALsource::eax5_set_defaults() noexcept
{
    eax5_set_defaults(mEax5.i);
    mEax5.d = mEax5.i;
}

void ALsource::eax_set_defaults() noexcept
{
    eax1_set_defaults();
    eax2_set_defaults();
    eax3_set_defaults();
    eax4_set_defaults();
    eax5_set_defaults();
}

void ALsource::eax1_translate(const Eax1Props& src, Eax5Props& dst) noexcept
{
    eax5_set_defaults(dst);

    if (src.fMix == EAX_REVERBMIX_USEDISTANCE)
    {
        dst.source.ulFlags |= EAXSOURCEFLAGS_ROOMAUTO;
        dst.sends[0].lSend = 0;
    }
    else
    {
        dst.source.ulFlags &= ~EAXSOURCEFLAGS_ROOMAUTO;
        dst.sends[0].lSend = std::clamp(static_cast<long>(gain_to_level_mb(src.fMix)),
            EAXSOURCE_MINSEND, EAXSOURCE_MAXSEND);
    }
}

void ALsource::eax2_translate(const Eax2Props& src, Eax5Props& dst) noexcept
{
    // Source.
    //
    dst.source.lDirect = src.lDirect;
    dst.source.lDirectHF = src.lDirectHF;
    dst.source.lRoom = src.lRoom;
    dst.source.lRoomHF = src.lRoomHF;
    dst.source.lObstruction = src.lObstruction;
    dst.source.flObstructionLFRatio = src.flObstructionLFRatio;
    dst.source.lOcclusion = src.lOcclusion;
    dst.source.flOcclusionLFRatio = src.flOcclusionLFRatio;
    dst.source.flOcclusionRoomRatio = src.flOcclusionRoomRatio;
    dst.source.flOcclusionDirectRatio = EAXSOURCE_DEFAULTOCCLUSIONDIRECTRATIO;
    dst.source.lExclusion = EAXSOURCE_DEFAULTEXCLUSION;
    dst.source.flExclusionLFRatio = EAXSOURCE_DEFAULTEXCLUSIONLFRATIO;
    dst.source.lOutsideVolumeHF = src.lOutsideVolumeHF;
    dst.source.flDopplerFactor = EAXSOURCE_DEFAULTDOPPLERFACTOR;
    dst.source.flRolloffFactor = EAXSOURCE_DEFAULTROLLOFFFACTOR;
    dst.source.flRoomRolloffFactor = src.flRoomRolloffFactor;
    dst.source.flAirAbsorptionFactor = src.flAirAbsorptionFactor;
    dst.source.ulFlags = src.dwFlags;
    dst.source.flMacroFXFactor = EAXSOURCE_DEFAULTMACROFXFACTOR;

    // Set everything else to defaults.
    //
    eax5_set_sends_defaults(dst.sends);
    eax5_set_active_fx_slots_defaults(dst.active_fx_slots);
    eax5_set_speaker_levels_defaults(dst.speaker_levels);
}

void ALsource::eax3_translate(const Eax3Props& src, Eax5Props& dst) noexcept
{
    // Source.
    //
    static_cast<Eax3Props&>(dst.source) = src;
    dst.source.flMacroFXFactor = EAXSOURCE_DEFAULTMACROFXFACTOR;

    // Set everything else to defaults.
    //
    eax5_set_sends_defaults(dst.sends);
    eax5_set_active_fx_slots_defaults(dst.active_fx_slots);
    eax5_set_speaker_levels_defaults(dst.speaker_levels);
}

void ALsource::eax4_translate(const Eax4Props& src, Eax5Props& dst) noexcept
{
    // Source.
    //
    static_cast<Eax3Props&>(dst.source) = src.source;
    dst.source.flMacroFXFactor = EAXSOURCE_DEFAULTMACROFXFACTOR;

    // Sends.
    //
    dst.sends = src.sends;

    for(size_t i{0};i < EAX_MAX_FXSLOTS;++i)
        dst.sends[i].guidReceivingFXSlotID = *(eax5_fx_slot_ids[i]);

    // Active FX slots.
    //
    for (auto i = 0; i < EAX50_MAX_ACTIVE_FXSLOTS; ++i) {
        auto& dst_id = dst.active_fx_slots.guidActiveFXSlots[i];

        if (i < EAX40_MAX_ACTIVE_FXSLOTS) {
            const auto& src_id = src.active_fx_slots.guidActiveFXSlots[i];

            if (src_id == EAX_NULL_GUID)
                dst_id = EAX_NULL_GUID;
            else if (src_id == EAX_PrimaryFXSlotID)
                dst_id = EAX_PrimaryFXSlotID;
            else if (src_id == EAXPROPERTYID_EAX40_FXSlot0)
                dst_id = EAXPROPERTYID_EAX50_FXSlot0;
            else if (src_id == EAXPROPERTYID_EAX40_FXSlot1)
                dst_id = EAXPROPERTYID_EAX50_FXSlot1;
            else if (src_id == EAXPROPERTYID_EAX40_FXSlot2)
                dst_id = EAXPROPERTYID_EAX50_FXSlot2;
            else if (src_id == EAXPROPERTYID_EAX40_FXSlot3)
                dst_id = EAXPROPERTYID_EAX50_FXSlot3;
            else
                assert(false && "Unknown active FX slot ID.");
        } else
            dst_id = EAX_NULL_GUID;
    }

    // Speaker levels.
    //
    eax5_set_speaker_levels_defaults(dst.speaker_levels);
}

float ALsource::eax_calculate_dst_occlusion_mb(
    long src_occlusion_mb,
    float path_ratio,
    float lf_ratio) noexcept
{
    const auto ratio_1 = path_ratio + lf_ratio - 1.0F;
    const auto ratio_2 = path_ratio * lf_ratio;
    const auto ratio = (ratio_2 > ratio_1) ? ratio_2 : ratio_1;
    const auto dst_occlustion_mb = static_cast<float>(src_occlusion_mb) * ratio;
    return dst_occlustion_mb;
}

EaxAlLowPassParam ALsource::eax_create_direct_filter_param() const noexcept
{
    auto gain_mb =
        static_cast<float>(mEax.source.lDirect) +
        (static_cast<float>(mEax.source.lObstruction) * mEax.source.flObstructionLFRatio) +
        eax_calculate_dst_occlusion_mb(
            mEax.source.lOcclusion,
            mEax.source.flOcclusionDirectRatio,
            mEax.source.flOcclusionLFRatio);

    const auto has_source_occlusion = (mEax.source.lOcclusion != 0);

    auto gain_hf_mb =
        static_cast<float>(mEax.source.lDirectHF) +
        static_cast<float>(mEax.source.lObstruction);

    for(size_t i{0};i < EAX_MAX_FXSLOTS;++i)
    {
        if(!mEaxActiveFxSlots[i])
            continue;

        if(has_source_occlusion)
        {
            const auto& fx_slot = mEaxAlContext->eaxGetFxSlot(i);
            const auto& fx_slot_eax = fx_slot.eax_get_eax_fx_slot();
            const auto is_environmental_fx = ((fx_slot_eax.ulFlags & EAXFXSLOTFLAGS_ENVIRONMENT) != 0);
            const auto is_primary = (mEaxPrimaryFxSlotId.value_or(-1) == fx_slot.eax_get_index());
            const auto is_listener_environment = (is_environmental_fx && is_primary);

            if(is_listener_environment)
            {
                gain_mb += eax_calculate_dst_occlusion_mb(
                    mEax.source.lOcclusion,
                    mEax.source.flOcclusionDirectRatio,
                    mEax.source.flOcclusionLFRatio);

                gain_hf_mb += static_cast<float>(mEax.source.lOcclusion) * mEax.source.flOcclusionDirectRatio;
            }
        }

        const auto& send = mEax.sends[i];

        if(send.lOcclusion != 0)
        {
            gain_mb += eax_calculate_dst_occlusion_mb(
                send.lOcclusion,
                send.flOcclusionDirectRatio,
                send.flOcclusionLFRatio);

            gain_hf_mb += static_cast<float>(send.lOcclusion) * send.flOcclusionDirectRatio;
        }
    }

    const auto al_low_pass_param = EaxAlLowPassParam{
        level_mb_to_gain(gain_mb),
        minf(level_mb_to_gain(gain_hf_mb), 1.0f)};

    return al_low_pass_param;
}

EaxAlLowPassParam ALsource::eax_create_room_filter_param(
    const ALeffectslot& fx_slot,
    const EAXSOURCEALLSENDPROPERTIES& send) const noexcept
{
    const auto& fx_slot_eax = fx_slot.eax_get_eax_fx_slot();
    const auto is_environmental_fx = ((fx_slot_eax.ulFlags & EAXFXSLOTFLAGS_ENVIRONMENT) != 0);
    const auto is_primary = (mEaxPrimaryFxSlotId.value_or(-1) == fx_slot.eax_get_index());
    const auto is_listener_environment = (is_environmental_fx && is_primary);

    const auto gain_mb =
        (static_cast<float>(fx_slot_eax.lOcclusion) * fx_slot_eax.flOcclusionLFRatio) +
        static_cast<float>((is_environmental_fx ? mEax.source.lRoom : 0) + send.lSend) +
        (is_listener_environment ?
            eax_calculate_dst_occlusion_mb(
                mEax.source.lOcclusion,
                mEax.source.flOcclusionRoomRatio,
                mEax.source.flOcclusionLFRatio) :
            0.0f) +
        eax_calculate_dst_occlusion_mb(
            send.lOcclusion,
            send.flOcclusionRoomRatio,
            send.flOcclusionLFRatio) +
        (is_listener_environment ?
            (static_cast<float>(mEax.source.lExclusion) * mEax.source.flExclusionLFRatio) :
            0.0f) +
        (static_cast<float>(send.lExclusion) * send.flExclusionLFRatio);

    const auto gain_hf_mb =
        static_cast<float>(fx_slot_eax.lOcclusion) +
        static_cast<float>((is_environmental_fx ? mEax.source.lRoomHF : 0) + send.lSendHF) +
        (is_listener_environment ?
            ((static_cast<float>(mEax.source.lOcclusion) * mEax.source.flOcclusionRoomRatio)) :
            0.0f) +
        (static_cast<float>(send.lOcclusion) * send.flOcclusionRoomRatio) +
        (is_listener_environment ?
            static_cast<float>(mEax.source.lExclusion + send.lExclusion) :
            0.0f);

    const auto al_low_pass_param = EaxAlLowPassParam{
        level_mb_to_gain(gain_mb),
        minf(level_mb_to_gain(gain_hf_mb), 1.0f)};

    return al_low_pass_param;
}

void ALsource::eax_update_direct_filter()
{
    const auto& direct_param = eax_create_direct_filter_param();
    Direct.Gain = direct_param.gain;
    Direct.GainHF = direct_param.gain_hf;
    Direct.HFReference = LOWPASSFREQREF;
    Direct.GainLF = 1.0f;
    Direct.LFReference = HIGHPASSFREQREF;
    mPropsDirty = true;
}

void ALsource::eax_update_room_filters()
{
    for(size_t i{0};i < EAX_MAX_FXSLOTS;++i)
    {
        if(!mEaxActiveFxSlots[i])
            continue;

        auto& fx_slot = mEaxAlContext->eaxGetFxSlot(i);
        const auto& send = mEax.sends[i];
        const auto& room_param = eax_create_room_filter_param(fx_slot, send);
        eax_set_al_source_send(&fx_slot, i, room_param);
    }
}

void ALsource::eax_set_efx_outer_gain_hf()
{
    OuterGainHF = std::clamp(
        level_mb_to_gain(static_cast<float>(mEax.source.lOutsideVolumeHF)),
        AL_MIN_CONE_OUTER_GAINHF,
        AL_MAX_CONE_OUTER_GAINHF);
}

void ALsource::eax_set_efx_doppler_factor()
{
    DopplerFactor = mEax.source.flDopplerFactor;
}

void ALsource::eax_set_efx_rolloff_factor()
{
    RolloffFactor2 = mEax.source.flRolloffFactor;
}

void ALsource::eax_set_efx_room_rolloff_factor()
{
    RoomRolloffFactor = mEax.source.flRoomRolloffFactor;
}

void ALsource::eax_set_efx_air_absorption_factor()
{
    AirAbsorptionFactor = mEax.source.flAirAbsorptionFactor;
}

void ALsource::eax_set_efx_dry_gain_hf_auto()
{
    DryGainHFAuto = ((mEax.source.ulFlags & EAXSOURCEFLAGS_DIRECTHFAUTO) != 0);
}

void ALsource::eax_set_efx_wet_gain_auto()
{
    WetGainAuto = ((mEax.source.ulFlags & EAXSOURCEFLAGS_ROOMAUTO) != 0);
}

void ALsource::eax_set_efx_wet_gain_hf_auto()
{
    WetGainHFAuto = ((mEax.source.ulFlags & EAXSOURCEFLAGS_ROOMHFAUTO) != 0);
}

void ALsource::eax1_set(const EaxCall& call, Eax1Props& props)
{
    switch (call.get_property_id()) {
        case DSPROPERTY_EAXBUFFER_ALL:
            eax_defer<Eax1SourceAllValidator>(call, props);
            break;

        case DSPROPERTY_EAXBUFFER_REVERBMIX:
            eax_defer<Eax1SourceReverbMixValidator>(call, props.fMix);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax2_set(const EaxCall& call, Eax2Props& props)
{
    switch (call.get_property_id()) {
        case DSPROPERTY_EAX20BUFFER_NONE:
            break;

        case DSPROPERTY_EAX20BUFFER_ALLPARAMETERS:
            eax_defer<Eax2SourceAllValidator>(call, props);
            break;

        case DSPROPERTY_EAX20BUFFER_DIRECT:
            eax_defer<Eax2SourceDirectValidator>(call, props.lDirect);
            break;

        case DSPROPERTY_EAX20BUFFER_DIRECTHF:
            eax_defer<Eax2SourceDirectHfValidator>(call, props.lDirectHF);
            break;

        case DSPROPERTY_EAX20BUFFER_ROOM:
            eax_defer<Eax2SourceRoomValidator>(call, props.lRoom);
            break;

        case DSPROPERTY_EAX20BUFFER_ROOMHF:
            eax_defer<Eax2SourceRoomHfValidator>(call, props.lRoomHF);
            break;

        case DSPROPERTY_EAX20BUFFER_ROOMROLLOFFFACTOR:
            eax_defer<Eax2SourceRoomRolloffFactorValidator>(call, props.flRoomRolloffFactor);
            break;

        case DSPROPERTY_EAX20BUFFER_OBSTRUCTION:
            eax_defer<Eax2SourceObstructionValidator>(call, props.lObstruction);
            break;

        case DSPROPERTY_EAX20BUFFER_OBSTRUCTIONLFRATIO:
            eax_defer<Eax2SourceObstructionLfRatioValidator>(call, props.flObstructionLFRatio);
            break;

        case DSPROPERTY_EAX20BUFFER_OCCLUSION:
            eax_defer<Eax2SourceOcclusionValidator>(call, props.lOcclusion);
            break;

        case DSPROPERTY_EAX20BUFFER_OCCLUSIONLFRATIO:
            eax_defer<Eax2SourceOcclusionLfRatioValidator>(call, props.flOcclusionLFRatio);
            break;

        case DSPROPERTY_EAX20BUFFER_OCCLUSIONROOMRATIO:
            eax_defer<Eax2SourceOcclusionRoomRatioValidator>(call, props.flOcclusionRoomRatio);
            break;

        case DSPROPERTY_EAX20BUFFER_OUTSIDEVOLUMEHF:
            eax_defer<Eax2SourceOutsideVolumeHfValidator>(call, props.lOutsideVolumeHF);
            break;

        case DSPROPERTY_EAX20BUFFER_AIRABSORPTIONFACTOR:
            eax_defer<Eax2SourceAirAbsorptionFactorValidator>(call, props.flAirAbsorptionFactor);
            break;

        case DSPROPERTY_EAX20BUFFER_FLAGS:
            eax_defer<Eax2SourceFlagsValidator>(call, props.dwFlags);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax3_set(const EaxCall& call, Eax3Props& props)
{
    switch (call.get_property_id()) {
        case EAXSOURCE_NONE:
            break;

        case EAXSOURCE_ALLPARAMETERS:
            eax_defer<Eax3SourceAllValidator>(call, props);
            break;

        case EAXSOURCE_OBSTRUCTIONPARAMETERS:
            eax_defer_sub<Eax4ObstructionValidator, EAXOBSTRUCTIONPROPERTIES>(call, props.lObstruction);
            break;

        case EAXSOURCE_OCCLUSIONPARAMETERS:
            eax_defer_sub<Eax4OcclusionValidator, EAXOCCLUSIONPROPERTIES>(call, props.lOcclusion);
            break;

        case EAXSOURCE_EXCLUSIONPARAMETERS:
            eax_defer_sub<Eax4ExclusionValidator, EAXEXCLUSIONPROPERTIES>(call, props.lExclusion);
            break;

        case EAXSOURCE_DIRECT:
            eax_defer<Eax2SourceDirectValidator>(call, props.lDirect);
            break;

        case EAXSOURCE_DIRECTHF:
            eax_defer<Eax2SourceDirectHfValidator>(call, props.lDirectHF);
            break;

        case EAXSOURCE_ROOM:
            eax_defer<Eax2SourceRoomValidator>(call, props.lRoom);
            break;

        case EAXSOURCE_ROOMHF:
            eax_defer<Eax2SourceRoomHfValidator>(call, props.lRoomHF);
            break;

        case EAXSOURCE_OBSTRUCTION:
            eax_defer<Eax2SourceObstructionValidator>(call, props.lObstruction);
            break;

        case EAXSOURCE_OBSTRUCTIONLFRATIO:
            eax_defer<Eax2SourceObstructionLfRatioValidator>(call, props.flObstructionLFRatio);
            break;

        case EAXSOURCE_OCCLUSION:
            eax_defer<Eax2SourceOcclusionValidator>(call, props.lOcclusion);
            break;

        case EAXSOURCE_OCCLUSIONLFRATIO:
            eax_defer<Eax2SourceOcclusionLfRatioValidator>(call, props.flOcclusionLFRatio);
            break;

        case EAXSOURCE_OCCLUSIONROOMRATIO:
            eax_defer<Eax2SourceOcclusionRoomRatioValidator>(call, props.flOcclusionRoomRatio);
            break;

        case EAXSOURCE_OCCLUSIONDIRECTRATIO:
            eax_defer<Eax3SourceOcclusionDirectRatioValidator>(call, props.flOcclusionDirectRatio);
            break;

        case EAXSOURCE_EXCLUSION:
            eax_defer<Eax3SourceExclusionValidator>(call, props.lExclusion);
            break;

        case EAXSOURCE_EXCLUSIONLFRATIO:
            eax_defer<Eax3SourceExclusionLfRatioValidator>(call, props.flExclusionLFRatio);
            break;

        case EAXSOURCE_OUTSIDEVOLUMEHF:
            eax_defer<Eax2SourceOutsideVolumeHfValidator>(call, props.lOutsideVolumeHF);
            break;

        case EAXSOURCE_DOPPLERFACTOR:
            eax_defer<Eax3SourceDopplerFactorValidator>(call, props.flDopplerFactor);
            break;

        case EAXSOURCE_ROLLOFFFACTOR:
            eax_defer<Eax3SourceRolloffFactorValidator>(call, props.flRolloffFactor);
            break;

        case EAXSOURCE_ROOMROLLOFFFACTOR:
            eax_defer<Eax2SourceRoomRolloffFactorValidator>(call, props.flRoomRolloffFactor);
            break;

        case EAXSOURCE_AIRABSORPTIONFACTOR:
            eax_defer<Eax2SourceAirAbsorptionFactorValidator>(call, props.flAirAbsorptionFactor);
            break;

        case EAXSOURCE_FLAGS:
            eax_defer<Eax2SourceFlagsValidator>(call, props.ulFlags);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax4_set(const EaxCall& call, Eax4Props& props)
{
    switch (call.get_property_id()) {
        case EAXSOURCE_NONE:
        case EAXSOURCE_ALLPARAMETERS:
        case EAXSOURCE_OBSTRUCTIONPARAMETERS:
        case EAXSOURCE_OCCLUSIONPARAMETERS:
        case EAXSOURCE_EXCLUSIONPARAMETERS:
        case EAXSOURCE_DIRECT:
        case EAXSOURCE_DIRECTHF:
        case EAXSOURCE_ROOM:
        case EAXSOURCE_ROOMHF:
        case EAXSOURCE_OBSTRUCTION:
        case EAXSOURCE_OBSTRUCTIONLFRATIO:
        case EAXSOURCE_OCCLUSION:
        case EAXSOURCE_OCCLUSIONLFRATIO:
        case EAXSOURCE_OCCLUSIONROOMRATIO:
        case EAXSOURCE_OCCLUSIONDIRECTRATIO:
        case EAXSOURCE_EXCLUSION:
        case EAXSOURCE_EXCLUSIONLFRATIO:
        case EAXSOURCE_OUTSIDEVOLUMEHF:
        case EAXSOURCE_DOPPLERFACTOR:
        case EAXSOURCE_ROLLOFFFACTOR:
        case EAXSOURCE_ROOMROLLOFFFACTOR:
        case EAXSOURCE_AIRABSORPTIONFACTOR:
        case EAXSOURCE_FLAGS:
            eax3_set(call, props.source);
            break;

        case EAXSOURCE_SENDPARAMETERS:
            eax4_defer_sends<Eax4SendValidator, EAXSOURCESENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_ALLSENDPARAMETERS:
            eax4_defer_sends<Eax4AllSendValidator, EAXSOURCEALLSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_OCCLUSIONSENDPARAMETERS:
            eax4_defer_sends<Eax4OcclusionSendValidator, EAXSOURCEOCCLUSIONSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_EXCLUSIONSENDPARAMETERS:
            eax4_defer_sends<Eax4ExclusionSendValidator, EAXSOURCEEXCLUSIONSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_ACTIVEFXSLOTID:
            eax4_defer_active_fx_slot_id(call, props.active_fx_slots.guidActiveFXSlots);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax5_defer_all_2d(const EaxCall& call, EAX50SOURCEPROPERTIES& props)
{
    const auto& src_props = call.get_value<Exception, const EAXSOURCE2DPROPERTIES>();
    Eax5SourceAll2dValidator{}(src_props);
    props.lDirect = src_props.lDirect;
    props.lDirectHF = src_props.lDirectHF;
    props.lRoom = src_props.lRoom;
    props.lRoomHF = src_props.lRoomHF;
    props.ulFlags = src_props.ulFlags;
}

void ALsource::eax5_defer_speaker_levels(const EaxCall& call, EaxSpeakerLevels& props)
{
    const auto values = call.get_values<const EAXSPEAKERLEVELPROPERTIES>(eax_max_speakers);
    std::for_each(values.cbegin(), values.cend(), Eax5SpeakerAllValidator{});

    for (const auto& value : values) {
        const auto index = static_cast<size_t>(value.lSpeakerID - EAXSPEAKER_FRONT_LEFT);
        props[index].lLevel = value.lLevel;
    }
}

void ALsource::eax5_set(const EaxCall& call, Eax5Props& props)
{
    switch (call.get_property_id()) {
        case EAXSOURCE_NONE:
            break;

        case EAXSOURCE_ALLPARAMETERS:
            eax_defer<Eax5SourceAllValidator>(call, props.source);
            break;

        case EAXSOURCE_OBSTRUCTIONPARAMETERS:
        case EAXSOURCE_OCCLUSIONPARAMETERS:
        case EAXSOURCE_EXCLUSIONPARAMETERS:
        case EAXSOURCE_DIRECT:
        case EAXSOURCE_DIRECTHF:
        case EAXSOURCE_ROOM:
        case EAXSOURCE_ROOMHF:
        case EAXSOURCE_OBSTRUCTION:
        case EAXSOURCE_OBSTRUCTIONLFRATIO:
        case EAXSOURCE_OCCLUSION:
        case EAXSOURCE_OCCLUSIONLFRATIO:
        case EAXSOURCE_OCCLUSIONROOMRATIO:
        case EAXSOURCE_OCCLUSIONDIRECTRATIO:
        case EAXSOURCE_EXCLUSION:
        case EAXSOURCE_EXCLUSIONLFRATIO:
        case EAXSOURCE_OUTSIDEVOLUMEHF:
        case EAXSOURCE_DOPPLERFACTOR:
        case EAXSOURCE_ROLLOFFFACTOR:
        case EAXSOURCE_ROOMROLLOFFFACTOR:
        case EAXSOURCE_AIRABSORPTIONFACTOR:
        case EAXSOURCE_FLAGS:
            eax3_set(call, props.source);
            break;

        case EAXSOURCE_SENDPARAMETERS:
            eax5_defer_sends<Eax5SendValidator, EAXSOURCESENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_ALLSENDPARAMETERS:
            eax5_defer_sends<Eax5AllSendValidator, EAXSOURCEALLSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_OCCLUSIONSENDPARAMETERS:
            eax5_defer_sends<Eax5OcclusionSendValidator, EAXSOURCEOCCLUSIONSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_EXCLUSIONSENDPARAMETERS:
            eax5_defer_sends<Eax5ExclusionSendValidator, EAXSOURCEEXCLUSIONSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_ACTIVEFXSLOTID:
            eax5_defer_active_fx_slot_id(call, props.active_fx_slots.guidActiveFXSlots);
            break;

        case EAXSOURCE_MACROFXFACTOR:
            eax_defer<Eax5SourceMacroFXFactorValidator>(call, props.source.flMacroFXFactor);
            break;

        case EAXSOURCE_SPEAKERLEVELS:
            eax5_defer_speaker_levels(call, props.speaker_levels);
            break;

        case EAXSOURCE_ALL2DPARAMETERS:
            eax5_defer_all_2d(call, props.source);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax_set(const EaxCall& call)
{
    const auto eax_version = call.get_version();
    switch(eax_version)
    {
    case 1: eax1_set(call, mEax1.d); break;
    case 2: eax2_set(call, mEax2.d); break;
    case 3: eax3_set(call, mEax3.d); break;
    case 4: eax4_set(call, mEax4.d); break;
    case 5: eax5_set(call, mEax5.d); break;
    default: eax_fail_unknown_property_id();
    }
    mEaxChanged = true;
    mEaxVersion = eax_version;
}

void ALsource::eax_get_active_fx_slot_id(const EaxCall& call, const GUID* ids, size_t max_count)
{
    assert(ids != nullptr);
    assert(max_count == EAX40_MAX_ACTIVE_FXSLOTS || max_count == EAX50_MAX_ACTIVE_FXSLOTS);
    const auto dst_ids = call.get_values<GUID>(max_count);
    const auto count = dst_ids.size();
    std::uninitialized_copy_n(ids, count, dst_ids.begin());
}

void ALsource::eax1_get(const EaxCall& call, const Eax1Props& props)
{
    switch (call.get_property_id()) {
        case DSPROPERTY_EAXBUFFER_ALL:
        case DSPROPERTY_EAXBUFFER_REVERBMIX:
            call.set_value<Exception>(props.fMix);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax2_get(const EaxCall& call, const Eax2Props& props)
{
    switch (call.get_property_id()) {
        case DSPROPERTY_EAX20BUFFER_NONE:
            break;

        case DSPROPERTY_EAX20BUFFER_ALLPARAMETERS:
            call.set_value<Exception>(props);
            break;

        case DSPROPERTY_EAX20BUFFER_DIRECT:
            call.set_value<Exception>(props.lDirect);
            break;

        case DSPROPERTY_EAX20BUFFER_DIRECTHF:
            call.set_value<Exception>(props.lDirectHF);
            break;

        case DSPROPERTY_EAX20BUFFER_ROOM:
            call.set_value<Exception>(props.lRoom);
            break;

        case DSPROPERTY_EAX20BUFFER_ROOMHF:
            call.set_value<Exception>(props.lRoomHF);
            break;

        case DSPROPERTY_EAX20BUFFER_ROOMROLLOFFFACTOR:
            call.set_value<Exception>(props.flRoomRolloffFactor);
            break;

        case DSPROPERTY_EAX20BUFFER_OBSTRUCTION:
            call.set_value<Exception>(props.lObstruction);
            break;

        case DSPROPERTY_EAX20BUFFER_OBSTRUCTIONLFRATIO:
            call.set_value<Exception>(props.flObstructionLFRatio);
            break;

        case DSPROPERTY_EAX20BUFFER_OCCLUSION:
            call.set_value<Exception>(props.lOcclusion);
            break;

        case DSPROPERTY_EAX20BUFFER_OCCLUSIONLFRATIO:
            call.set_value<Exception>(props.flOcclusionLFRatio);
            break;

        case DSPROPERTY_EAX20BUFFER_OCCLUSIONROOMRATIO:
            call.set_value<Exception>(props.flOcclusionRoomRatio);
            break;

        case DSPROPERTY_EAX20BUFFER_OUTSIDEVOLUMEHF:
            call.set_value<Exception>(props.lOutsideVolumeHF);
            break;

        case DSPROPERTY_EAX20BUFFER_AIRABSORPTIONFACTOR:
            call.set_value<Exception>(props.flAirAbsorptionFactor);
            break;

        case DSPROPERTY_EAX20BUFFER_FLAGS:
            call.set_value<Exception>(props.dwFlags);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax3_get_obstruction(const EaxCall& call, const Eax3Props& props)
{
    const auto& subprops = reinterpret_cast<const EAXOBSTRUCTIONPROPERTIES&>(props.lObstruction);
    call.set_value<Exception>(subprops);
}

void ALsource::eax3_get_occlusion(const EaxCall& call, const Eax3Props& props)
{
    const auto& subprops = reinterpret_cast<const EAXOCCLUSIONPROPERTIES&>(props.lOcclusion);
    call.set_value<Exception>(subprops);
}

void ALsource::eax3_get_exclusion(const EaxCall& call, const Eax3Props& props)
{
    const auto& subprops = reinterpret_cast<const EAXEXCLUSIONPROPERTIES&>(props.lExclusion);
    call.set_value<Exception>(subprops);
}

void ALsource::eax3_get(const EaxCall& call, const Eax3Props& props)
{
    switch (call.get_property_id()) {
        case EAXSOURCE_NONE:
            break;

        case EAXSOURCE_ALLPARAMETERS:
            call.set_value<Exception>(props);
            break;

        case EAXSOURCE_OBSTRUCTIONPARAMETERS:
            eax3_get_obstruction(call, props);
            break;

        case EAXSOURCE_OCCLUSIONPARAMETERS:
            eax3_get_occlusion(call, props);
            break;

        case EAXSOURCE_EXCLUSIONPARAMETERS:
            eax3_get_exclusion(call, props);
            break;

        case EAXSOURCE_DIRECT:
            call.set_value<Exception>(props.lDirect);
            break;

        case EAXSOURCE_DIRECTHF:
            call.set_value<Exception>(props.lDirectHF);
            break;

        case EAXSOURCE_ROOM:
            call.set_value<Exception>(props.lRoom);
            break;

        case EAXSOURCE_ROOMHF:
            call.set_value<Exception>(props.lRoomHF);
            break;

        case EAXSOURCE_OBSTRUCTION:
            call.set_value<Exception>(props.lObstruction);
            break;

        case EAXSOURCE_OBSTRUCTIONLFRATIO:
            call.set_value<Exception>(props.flObstructionLFRatio);
            break;

        case EAXSOURCE_OCCLUSION:
            call.set_value<Exception>(props.lOcclusion);
            break;

        case EAXSOURCE_OCCLUSIONLFRATIO:
            call.set_value<Exception>(props.flOcclusionLFRatio);
            break;

        case EAXSOURCE_OCCLUSIONROOMRATIO:
            call.set_value<Exception>(props.flOcclusionRoomRatio);
            break;

        case EAXSOURCE_OCCLUSIONDIRECTRATIO:
            call.set_value<Exception>(props.flOcclusionDirectRatio);
            break;

        case EAXSOURCE_EXCLUSION:
            call.set_value<Exception>(props.lExclusion);
            break;

        case EAXSOURCE_EXCLUSIONLFRATIO:
            call.set_value<Exception>(props.flExclusionLFRatio);
            break;

        case EAXSOURCE_OUTSIDEVOLUMEHF:
            call.set_value<Exception>(props.lOutsideVolumeHF);
            break;

        case EAXSOURCE_DOPPLERFACTOR:
            call.set_value<Exception>(props.flDopplerFactor);
            break;

        case EAXSOURCE_ROLLOFFFACTOR:
            call.set_value<Exception>(props.flRolloffFactor);
            break;

        case EAXSOURCE_ROOMROLLOFFFACTOR:
            call.set_value<Exception>(props.flRoomRolloffFactor);
            break;

        case EAXSOURCE_AIRABSORPTIONFACTOR:
            call.set_value<Exception>(props.flAirAbsorptionFactor);
            break;

        case EAXSOURCE_FLAGS:
            call.set_value<Exception>(props.ulFlags);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax4_get(const EaxCall& call, const Eax4Props& props)
{
    switch (call.get_property_id()) {
        case EAXSOURCE_NONE:
            break;

        case EAXSOURCE_ALLPARAMETERS:
        case EAXSOURCE_OBSTRUCTIONPARAMETERS:
        case EAXSOURCE_OCCLUSIONPARAMETERS:
        case EAXSOURCE_EXCLUSIONPARAMETERS:
        case EAXSOURCE_DIRECT:
        case EAXSOURCE_DIRECTHF:
        case EAXSOURCE_ROOM:
        case EAXSOURCE_ROOMHF:
        case EAXSOURCE_OBSTRUCTION:
        case EAXSOURCE_OBSTRUCTIONLFRATIO:
        case EAXSOURCE_OCCLUSION:
        case EAXSOURCE_OCCLUSIONLFRATIO:
        case EAXSOURCE_OCCLUSIONROOMRATIO:
        case EAXSOURCE_OCCLUSIONDIRECTRATIO:
        case EAXSOURCE_EXCLUSION:
        case EAXSOURCE_EXCLUSIONLFRATIO:
        case EAXSOURCE_OUTSIDEVOLUMEHF:
        case EAXSOURCE_DOPPLERFACTOR:
        case EAXSOURCE_ROLLOFFFACTOR:
        case EAXSOURCE_ROOMROLLOFFFACTOR:
        case EAXSOURCE_AIRABSORPTIONFACTOR:
        case EAXSOURCE_FLAGS:
            eax3_get(call, props.source);
            break;

        case EAXSOURCE_SENDPARAMETERS:
            eax_get_sends<EAXSOURCESENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_ALLSENDPARAMETERS:
            eax_get_sends<EAXSOURCEALLSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_OCCLUSIONSENDPARAMETERS:
            eax_get_sends<EAXSOURCEOCCLUSIONSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_EXCLUSIONSENDPARAMETERS:
            eax_get_sends<EAXSOURCEEXCLUSIONSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_ACTIVEFXSLOTID:
            eax_get_active_fx_slot_id(call, props.active_fx_slots.guidActiveFXSlots, EAX40_MAX_ACTIVE_FXSLOTS);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax5_get_all_2d(const EaxCall& call, const EAX50SOURCEPROPERTIES& props)
{
    auto& subprops = call.get_value<Exception, EAXSOURCE2DPROPERTIES>();
    subprops.lDirect = props.lDirect;
    subprops.lDirectHF = props.lDirectHF;
    subprops.lRoom = props.lRoom;
    subprops.lRoomHF = props.lRoomHF;
    subprops.ulFlags = props.ulFlags;
}

void ALsource::eax5_get_speaker_levels(const EaxCall& call, const EaxSpeakerLevels& props)
{
    const auto subprops = call.get_values<EAXSPEAKERLEVELPROPERTIES>(eax_max_speakers);
    std::uninitialized_copy_n(props.cbegin(), subprops.size(), subprops.begin());
}

void ALsource::eax5_get(const EaxCall& call, const Eax5Props& props)
{
    switch (call.get_property_id()) {
        case EAXSOURCE_NONE:
            break;

        case EAXSOURCE_ALLPARAMETERS:
        case EAXSOURCE_OBSTRUCTIONPARAMETERS:
        case EAXSOURCE_OCCLUSIONPARAMETERS:
        case EAXSOURCE_EXCLUSIONPARAMETERS:
        case EAXSOURCE_DIRECT:
        case EAXSOURCE_DIRECTHF:
        case EAXSOURCE_ROOM:
        case EAXSOURCE_ROOMHF:
        case EAXSOURCE_OBSTRUCTION:
        case EAXSOURCE_OBSTRUCTIONLFRATIO:
        case EAXSOURCE_OCCLUSION:
        case EAXSOURCE_OCCLUSIONLFRATIO:
        case EAXSOURCE_OCCLUSIONROOMRATIO:
        case EAXSOURCE_OCCLUSIONDIRECTRATIO:
        case EAXSOURCE_EXCLUSION:
        case EAXSOURCE_EXCLUSIONLFRATIO:
        case EAXSOURCE_OUTSIDEVOLUMEHF:
        case EAXSOURCE_DOPPLERFACTOR:
        case EAXSOURCE_ROLLOFFFACTOR:
        case EAXSOURCE_ROOMROLLOFFFACTOR:
        case EAXSOURCE_AIRABSORPTIONFACTOR:
        case EAXSOURCE_FLAGS:
            eax3_get(call, props.source);
            break;

        case EAXSOURCE_SENDPARAMETERS:
            eax_get_sends<EAXSOURCESENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_ALLSENDPARAMETERS:
            eax_get_sends<EAXSOURCEALLSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_OCCLUSIONSENDPARAMETERS:
            eax_get_sends<EAXSOURCEOCCLUSIONSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_EXCLUSIONSENDPARAMETERS:
            eax_get_sends<EAXSOURCEEXCLUSIONSENDPROPERTIES>(call, props.sends);
            break;

        case EAXSOURCE_ACTIVEFXSLOTID:
            eax_get_active_fx_slot_id(call, props.active_fx_slots.guidActiveFXSlots, EAX50_MAX_ACTIVE_FXSLOTS);
            break;

        case EAXSOURCE_MACROFXFACTOR:
            call.set_value<Exception>(props.source.flMacroFXFactor);
            break;

        case EAXSOURCE_SPEAKERLEVELS:
            call.set_value<Exception>(props.speaker_levels);
            break;

        case EAXSOURCE_ALL2DPARAMETERS:
            eax5_get_all_2d(call, props.source);
            break;

        default:
            eax_fail_unknown_property_id();
    }
}

void ALsource::eax_get(const EaxCall& call)
{
    switch (call.get_version()) {
        case 1: eax1_get(call, mEax1.i); break;
        case 2: eax2_get(call, mEax2.i); break;
        case 3: eax3_get(call, mEax3.i); break;
        case 4: eax4_get(call, mEax4.i); break;
        case 5: eax5_get(call, mEax5.i); break;
        default: eax_fail_unknown_version();
    }
}

void ALsource::eax_set_al_source_send(ALeffectslot *slot, size_t sendidx, const EaxAlLowPassParam &filter)
{
    if(sendidx >= EAX_MAX_FXSLOTS)
        return;

    auto &send = Send[sendidx];
    send.Gain = filter.gain;
    send.GainHF = filter.gain_hf;
    send.HFReference = LOWPASSFREQREF;
    send.GainLF = 1.0f;
    send.LFReference = HIGHPASSFREQREF;

    if(slot != nullptr)
        IncrementRef(slot->ref);
    if(auto *oldslot = send.Slot)
        DecrementRef(oldslot->ref);

    send.Slot = slot;
    mPropsDirty = true;
}

void ALsource::eax_commit_active_fx_slots()
{
    // Clear all slots to an inactive state.
    mEaxActiveFxSlots.fill(false);

    // Mark the set slots as active.
    for(const auto& slot_id : mEax.active_fx_slots.guidActiveFXSlots)
    {
        if(slot_id == EAX_NULL_GUID)
        {
        }
        else if(slot_id == EAX_PrimaryFXSlotID)
        {
            // Mark primary FX slot as active.
            if(mEaxPrimaryFxSlotId.has_value())
                mEaxActiveFxSlots[*mEaxPrimaryFxSlotId] = true;
        }
        else if(slot_id == EAXPROPERTYID_EAX50_FXSlot0)
            mEaxActiveFxSlots[0] = true;
        else if(slot_id == EAXPROPERTYID_EAX50_FXSlot1)
            mEaxActiveFxSlots[1] = true;
        else if(slot_id == EAXPROPERTYID_EAX50_FXSlot2)
            mEaxActiveFxSlots[2] = true;
        else if(slot_id == EAXPROPERTYID_EAX50_FXSlot3)
            mEaxActiveFxSlots[3] = true;
    }

    // Deactivate EFX auxiliary effect slots for inactive slots. Active slots
    // will be updated with the room filters.
    for(size_t i{0};i < EAX_MAX_FXSLOTS;++i)
    {
        if(!mEaxActiveFxSlots[i])
            eax_set_al_source_send(nullptr, i, EaxAlLowPassParam{1.0f, 1.0f});
    }
}

void ALsource::eax_commit_filters()
{
    eax_update_direct_filter();
    eax_update_room_filters();
}

void ALsource::eaxCommit()
{
    const auto primary_fx_slot_id = mEaxAlContext->eaxGetPrimaryFxSlotIndex();
    const auto is_primary_fx_slot_id_changed = (mEaxPrimaryFxSlotId != primary_fx_slot_id);

    if(!mEaxChanged && !is_primary_fx_slot_id_changed)
        return;

    mEaxPrimaryFxSlotId = primary_fx_slot_id;
    mEaxChanged = false;

    switch(mEaxVersion)
    {
    case 1:
        mEax1.i = mEax1.d;
        eax1_translate(mEax1.i, mEax);
        break;
    case 2:
        mEax2.i = mEax2.d;
        eax2_translate(mEax2.i, mEax);
        break;
    case 3:
        mEax3.i = mEax3.d;
        eax3_translate(mEax3.i, mEax);
        break;
    case 4:
        mEax4.i = mEax4.d;
        eax4_translate(mEax4.i, mEax);
        break;
    case 5:
        mEax5.i = mEax5.d;
        mEax = mEax5.d;
        break;
    }

    eax_set_efx_outer_gain_hf();
    eax_set_efx_doppler_factor();
    eax_set_efx_rolloff_factor();
    eax_set_efx_room_rolloff_factor();
    eax_set_efx_air_absorption_factor();
    eax_set_efx_dry_gain_hf_auto();
    eax_set_efx_wet_gain_auto();
    eax_set_efx_wet_gain_hf_auto();

    eax_commit_active_fx_slots();
    eax_commit_filters();
}

#endif // ALSOFT_EAX