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axmol/thirdparty/openal/core/converter.cpp

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#include "config.h"
#include "converter.h"
#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstdint>
#include <iterator>
#include <limits.h>
#include "albit.h"
#include "albyte.h"
#include "alnumeric.h"
#include "fpu_ctrl.h"
struct CTag;
struct CopyTag;
namespace {
constexpr uint MaxPitch{10};
static_assert((BufferLineSize-1)/MaxPitch > 0, "MaxPitch is too large for BufferLineSize!");
static_assert((INT_MAX>>MixerFracBits)/MaxPitch > BufferLineSize,
"MaxPitch and/or BufferLineSize are too large for MixerFracBits!");
/* Base template left undefined. Should be marked =delete, but Clang 3.8.1
* chokes on that given the inline specializations.
*/
template<DevFmtType T>
inline float LoadSample(DevFmtType_t<T> val) noexcept;
template<> inline float LoadSample<DevFmtByte>(DevFmtType_t<DevFmtByte> val) noexcept
{ return val * (1.0f/128.0f); }
template<> inline float LoadSample<DevFmtShort>(DevFmtType_t<DevFmtShort> val) noexcept
{ return val * (1.0f/32768.0f); }
template<> inline float LoadSample<DevFmtInt>(DevFmtType_t<DevFmtInt> val) noexcept
{ return static_cast<float>(val) * (1.0f/2147483648.0f); }
template<> inline float LoadSample<DevFmtFloat>(DevFmtType_t<DevFmtFloat> val) noexcept
{ return val; }
template<> inline float LoadSample<DevFmtUByte>(DevFmtType_t<DevFmtUByte> val) noexcept
{ return LoadSample<DevFmtByte>(static_cast<int8_t>(val - 128)); }
template<> inline float LoadSample<DevFmtUShort>(DevFmtType_t<DevFmtUShort> val) noexcept
{ return LoadSample<DevFmtShort>(static_cast<int16_t>(val - 32768)); }
template<> inline float LoadSample<DevFmtUInt>(DevFmtType_t<DevFmtUInt> val) noexcept
{ return LoadSample<DevFmtInt>(static_cast<int32_t>(val - 2147483648u)); }
template<DevFmtType T>
inline void LoadSampleArray(float *RESTRICT dst, const void *src, const size_t srcstep,
const size_t samples) noexcept
{
const DevFmtType_t<T> *ssrc = static_cast<const DevFmtType_t<T>*>(src);
for(size_t i{0u};i < samples;i++)
dst[i] = LoadSample<T>(ssrc[i*srcstep]);
}
void LoadSamples(float *dst, const void *src, const size_t srcstep, const DevFmtType srctype,
const size_t samples) noexcept
{
#define HANDLE_FMT(T) \
case T: LoadSampleArray<T>(dst, src, srcstep, samples); break
switch(srctype)
{
HANDLE_FMT(DevFmtByte);
HANDLE_FMT(DevFmtUByte);
HANDLE_FMT(DevFmtShort);
HANDLE_FMT(DevFmtUShort);
HANDLE_FMT(DevFmtInt);
HANDLE_FMT(DevFmtUInt);
HANDLE_FMT(DevFmtFloat);
}
#undef HANDLE_FMT
}
template<DevFmtType T>
inline DevFmtType_t<T> StoreSample(float) noexcept;
template<> inline float StoreSample<DevFmtFloat>(float val) noexcept
{ return val; }
template<> inline int32_t StoreSample<DevFmtInt>(float val) noexcept
{ return fastf2i(clampf(val*2147483648.0f, -2147483648.0f, 2147483520.0f)); }
template<> inline int16_t StoreSample<DevFmtShort>(float val) noexcept
{ return static_cast<int16_t>(fastf2i(clampf(val*32768.0f, -32768.0f, 32767.0f))); }
template<> inline int8_t StoreSample<DevFmtByte>(float val) noexcept
{ return static_cast<int8_t>(fastf2i(clampf(val*128.0f, -128.0f, 127.0f))); }
/* Define unsigned output variations. */
template<> inline uint32_t StoreSample<DevFmtUInt>(float val) noexcept
{ return static_cast<uint32_t>(StoreSample<DevFmtInt>(val)) + 2147483648u; }
template<> inline uint16_t StoreSample<DevFmtUShort>(float val) noexcept
{ return static_cast<uint16_t>(StoreSample<DevFmtShort>(val) + 32768); }
template<> inline uint8_t StoreSample<DevFmtUByte>(float val) noexcept
{ return static_cast<uint8_t>(StoreSample<DevFmtByte>(val) + 128); }
template<DevFmtType T>
inline void StoreSampleArray(void *dst, const float *RESTRICT src, const size_t dststep,
const size_t samples) noexcept
{
DevFmtType_t<T> *sdst = static_cast<DevFmtType_t<T>*>(dst);
for(size_t i{0u};i < samples;i++)
sdst[i*dststep] = StoreSample<T>(src[i]);
}
void StoreSamples(void *dst, const float *src, const size_t dststep, const DevFmtType dsttype,
const size_t samples) noexcept
{
#define HANDLE_FMT(T) \
case T: StoreSampleArray<T>(dst, src, dststep, samples); break
switch(dsttype)
{
HANDLE_FMT(DevFmtByte);
HANDLE_FMT(DevFmtUByte);
HANDLE_FMT(DevFmtShort);
HANDLE_FMT(DevFmtUShort);
HANDLE_FMT(DevFmtInt);
HANDLE_FMT(DevFmtUInt);
HANDLE_FMT(DevFmtFloat);
}
#undef HANDLE_FMT
}
template<DevFmtType T>
void Mono2Stereo(float *RESTRICT dst, const void *src, const size_t frames) noexcept
{
const DevFmtType_t<T> *ssrc = static_cast<const DevFmtType_t<T>*>(src);
for(size_t i{0u};i < frames;i++)
dst[i*2 + 1] = dst[i*2 + 0] = LoadSample<T>(ssrc[i]) * 0.707106781187f;
}
template<DevFmtType T>
void Multi2Mono(uint chanmask, const size_t step, const float scale, float *RESTRICT dst,
const void *src, const size_t frames) noexcept
{
const DevFmtType_t<T> *ssrc = static_cast<const DevFmtType_t<T>*>(src);
std::fill_n(dst, frames, 0.0f);
for(size_t c{0};chanmask;++c)
{
if((chanmask&1)) [[likely]]
{
for(size_t i{0u};i < frames;i++)
dst[i] += LoadSample<T>(ssrc[i*step + c]);
}
chanmask >>= 1;
}
for(size_t i{0u};i < frames;i++)
dst[i] *= scale;
}
} // namespace
SampleConverterPtr SampleConverter::Create(DevFmtType srcType, DevFmtType dstType, size_t numchans,
uint srcRate, uint dstRate, Resampler resampler)
{
if(numchans < 1 || srcRate < 1 || dstRate < 1)
return nullptr;
SampleConverterPtr converter{new(FamCount(numchans)) SampleConverter{numchans}};
converter->mSrcType = srcType;
converter->mDstType = dstType;
converter->mSrcTypeSize = BytesFromDevFmt(srcType);
converter->mDstTypeSize = BytesFromDevFmt(dstType);
converter->mSrcPrepCount = MaxResamplerPadding;
converter->mFracOffset = 0;
for(auto &chan : converter->mChan)
{
const al::span<float> buffer{chan.PrevSamples};
std::fill(buffer.begin(), buffer.end(), 0.0f);
}
/* Have to set the mixer FPU mode since that's what the resampler code expects. */
FPUCtl mixer_mode{};
auto step = static_cast<uint>(
mind(srcRate*double{MixerFracOne}/dstRate + 0.5, MaxPitch*MixerFracOne));
converter->mIncrement = maxu(step, 1);
if(converter->mIncrement == MixerFracOne)
converter->mResample = Resample_<CopyTag,CTag>;
else
converter->mResample = PrepareResampler(resampler, converter->mIncrement,
&converter->mState);
return converter;
}
uint SampleConverter::availableOut(uint srcframes) const
{
if(srcframes < 1)
{
/* No output samples if there's no input samples. */
return 0;
}
const uint prepcount{mSrcPrepCount};
if(prepcount < MaxResamplerPadding && MaxResamplerPadding - prepcount >= srcframes)
{
/* Not enough input samples to generate an output sample. */
return 0;
}
uint64_t DataSize64{prepcount};
DataSize64 += srcframes;
DataSize64 -= MaxResamplerPadding;
DataSize64 <<= MixerFracBits;
DataSize64 -= mFracOffset;
/* If we have a full prep, we can generate at least one sample. */
return static_cast<uint>(clampu64((DataSize64 + mIncrement-1)/mIncrement, 1,
std::numeric_limits<int>::max()));
}
uint SampleConverter::convert(const void **src, uint *srcframes, void *dst, uint dstframes)
{
const uint SrcFrameSize{static_cast<uint>(mChan.size()) * mSrcTypeSize};
const uint DstFrameSize{static_cast<uint>(mChan.size()) * mDstTypeSize};
const uint increment{mIncrement};
auto SamplesIn = static_cast<const al::byte*>(*src);
uint NumSrcSamples{*srcframes};
FPUCtl mixer_mode{};
uint pos{0};
while(pos < dstframes && NumSrcSamples > 0)
{
const uint prepcount{mSrcPrepCount};
const uint readable{minu(NumSrcSamples, BufferLineSize - prepcount)};
if(prepcount < MaxResamplerPadding && MaxResamplerPadding-prepcount >= readable)
{
/* Not enough input samples to generate an output sample. Store
* what we're given for later.
*/
for(size_t chan{0u};chan < mChan.size();chan++)
LoadSamples(&mChan[chan].PrevSamples[prepcount], SamplesIn + mSrcTypeSize*chan,
mChan.size(), mSrcType, readable);
mSrcPrepCount = prepcount + readable;
NumSrcSamples = 0;
break;
}
float *RESTRICT SrcData{mSrcSamples};
float *RESTRICT DstData{mDstSamples};
uint DataPosFrac{mFracOffset};
uint64_t DataSize64{prepcount};
DataSize64 += readable;
DataSize64 -= MaxResamplerPadding;
DataSize64 <<= MixerFracBits;
DataSize64 -= DataPosFrac;
/* If we have a full prep, we can generate at least one sample. */
auto DstSize = static_cast<uint>(
clampu64((DataSize64 + increment-1)/increment, 1, BufferLineSize));
DstSize = minu(DstSize, dstframes-pos);
const uint DataPosEnd{DstSize*increment + DataPosFrac};
const uint SrcDataEnd{DataPosEnd>>MixerFracBits};
assert(prepcount+readable >= SrcDataEnd);
const uint nextprep{minu(prepcount + readable - SrcDataEnd, MaxResamplerPadding)};
for(size_t chan{0u};chan < mChan.size();chan++)
{
const al::byte *SrcSamples{SamplesIn + mSrcTypeSize*chan};
al::byte *DstSamples = static_cast<al::byte*>(dst) + mDstTypeSize*chan;
/* Load the previous samples into the source data first, then the
* new samples from the input buffer.
*/
std::copy_n(mChan[chan].PrevSamples, prepcount, SrcData);
LoadSamples(SrcData + prepcount, SrcSamples, mChan.size(), mSrcType, readable);
/* Store as many prep samples for next time as possible, given the
* number of output samples being generated.
*/
std::copy_n(SrcData+SrcDataEnd, nextprep, mChan[chan].PrevSamples);
std::fill(std::begin(mChan[chan].PrevSamples)+nextprep,
std::end(mChan[chan].PrevSamples), 0.0f);
/* Now resample, and store the result in the output buffer. */
const float *ResampledData{mResample(&mState, SrcData+(MaxResamplerPadding>>1),
DataPosFrac, increment, {DstData, DstSize})};
StoreSamples(DstSamples, ResampledData, mChan.size(), mDstType, DstSize);
}
/* Update the number of prep samples still available, as well as the
* fractional offset.
*/
mSrcPrepCount = nextprep;
mFracOffset = DataPosEnd & MixerFracMask;
/* Update the src and dst pointers in case there's still more to do. */
const uint srcread{minu(NumSrcSamples, SrcDataEnd + mSrcPrepCount - prepcount)};
SamplesIn += SrcFrameSize*srcread;
NumSrcSamples -= srcread;
dst = static_cast<al::byte*>(dst) + DstFrameSize*DstSize;
pos += DstSize;
}
*src = SamplesIn;
*srcframes = NumSrcSamples;
return pos;
}
void ChannelConverter::convert(const void *src, float *dst, uint frames) const
{
if(mDstChans == DevFmtMono)
{
const float scale{std::sqrt(1.0f / static_cast<float>(al::popcount(mChanMask)))};
switch(mSrcType)
{
#define HANDLE_FMT(T) case T: Multi2Mono<T>(mChanMask, mSrcStep, scale, dst, src, frames); break
HANDLE_FMT(DevFmtByte);
HANDLE_FMT(DevFmtUByte);
HANDLE_FMT(DevFmtShort);
HANDLE_FMT(DevFmtUShort);
HANDLE_FMT(DevFmtInt);
HANDLE_FMT(DevFmtUInt);
HANDLE_FMT(DevFmtFloat);
#undef HANDLE_FMT
}
}
else if(mChanMask == 0x1 && mDstChans == DevFmtStereo)
{
switch(mSrcType)
{
#define HANDLE_FMT(T) case T: Mono2Stereo<T>(dst, src, frames); break
HANDLE_FMT(DevFmtByte);
HANDLE_FMT(DevFmtUByte);
HANDLE_FMT(DevFmtShort);
HANDLE_FMT(DevFmtUShort);
HANDLE_FMT(DevFmtInt);
HANDLE_FMT(DevFmtUInt);
HANDLE_FMT(DevFmtFloat);
#undef HANDLE_FMT
}
}
}
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