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axmol/thirdparty/openal/alc/backends/sndio.cpp

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/**
* 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 "sndio.h"
#include <functional>
#include <inttypes.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <thread>
#include "alnumeric.h"
#include "core/device.h"
#include "core/helpers.h"
#include "core/logging.h"
#include "ringbuffer.h"
#include "threads.h"
#include "vector.h"
#include <sndio.h>
namespace {
static const char sndio_device[] = "SndIO Default";
struct SioPar : public sio_par {
SioPar() { sio_initpar(this); }
void clear() { sio_initpar(this); }
};
struct SndioPlayback final : public BackendBase {
SndioPlayback(DeviceBase *device) noexcept : BackendBase{device} { }
~SndioPlayback() override;
int mixerProc();
void open(const char *name) override;
bool reset() override;
void start() override;
void stop() override;
sio_hdl *mSndHandle{nullptr};
uint mFrameStep{};
al::vector<al::byte> mBuffer;
std::atomic<bool> mKillNow{true};
std::thread mThread;
DEF_NEWDEL(SndioPlayback)
};
SndioPlayback::~SndioPlayback()
{
if(mSndHandle)
sio_close(mSndHandle);
mSndHandle = nullptr;
}
int SndioPlayback::mixerProc()
{
const size_t frameStep{mFrameStep};
const size_t frameSize{frameStep * mDevice->bytesFromFmt()};
SetRTPriority();
althrd_setname(MIXER_THREAD_NAME);
while(!mKillNow.load(std::memory_order_acquire)
&& mDevice->Connected.load(std::memory_order_acquire))
{
al::span<al::byte> buffer{mBuffer};
mDevice->renderSamples(buffer.data(), static_cast<uint>(buffer.size() / frameSize),
frameStep);
while(!buffer.empty() && !mKillNow.load(std::memory_order_acquire))
{
size_t wrote{sio_write(mSndHandle, buffer.data(), buffer.size())};
if(wrote > buffer.size() || wrote == 0)
{
ERR("sio_write failed: 0x%" PRIx64 "\n", wrote);
mDevice->handleDisconnect("Failed to write playback samples");
break;
}
buffer = buffer.subspan(wrote);
}
}
return 0;
}
void SndioPlayback::open(const char *name)
{
if(!name)
name = sndio_device;
else if(strcmp(name, sndio_device) != 0)
throw al::backend_exception{al::backend_error::NoDevice, "Device name \"%s\" not found",
name};
sio_hdl *sndHandle{sio_open(nullptr, SIO_PLAY, 0)};
if(!sndHandle)
throw al::backend_exception{al::backend_error::NoDevice, "Could not open backend device"};
if(mSndHandle)
sio_close(mSndHandle);
mSndHandle = sndHandle;
mDevice->DeviceName = name;
}
bool SndioPlayback::reset()
{
SioPar par;
auto tryfmt = mDevice->FmtType;
retry_params:
switch(tryfmt)
{
case DevFmtByte:
par.bits = 8;
par.sig = 1;
break;
case DevFmtUByte:
par.bits = 8;
par.sig = 0;
break;
case DevFmtShort:
par.bits = 16;
par.sig = 1;
break;
case DevFmtUShort:
par.bits = 16;
par.sig = 0;
break;
case DevFmtFloat:
case DevFmtInt:
par.bits = 32;
par.sig = 1;
break;
case DevFmtUInt:
par.bits = 32;
par.sig = 0;
break;
}
par.bps = SIO_BPS(par.bits);
par.le = SIO_LE_NATIVE;
par.msb = 1;
par.rate = mDevice->Frequency;
par.pchan = mDevice->channelsFromFmt();
par.round = mDevice->UpdateSize;
par.appbufsz = mDevice->BufferSize - mDevice->UpdateSize;
if(!par.appbufsz) par.appbufsz = mDevice->UpdateSize;
try {
if(!sio_setpar(mSndHandle, &par))
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to set device parameters"};
par.clear();
if(!sio_getpar(mSndHandle, &par))
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to get device parameters"};
if(par.bps > 1 && par.le != SIO_LE_NATIVE)
throw al::backend_exception{al::backend_error::DeviceError,
"%s-endian samples not supported", par.le ? "Little" : "Big"};
if(par.bits < par.bps*8 && !par.msb)
throw al::backend_exception{al::backend_error::DeviceError,
"MSB-padded samples not supported (%u of %u bits)", par.bits, par.bps*8};
if(par.pchan < 1)
throw al::backend_exception{al::backend_error::DeviceError,
"No playback channels on device"};
}
catch(al::backend_exception &e) {
if(tryfmt == DevFmtShort)
throw;
par.clear();
tryfmt = DevFmtShort;
goto retry_params;
}
if(par.bps == 1)
mDevice->FmtType = (par.sig==1) ? DevFmtByte : DevFmtUByte;
else if(par.bps == 2)
mDevice->FmtType = (par.sig==1) ? DevFmtShort : DevFmtUShort;
else if(par.bps == 4)
mDevice->FmtType = (par.sig==1) ? DevFmtInt : DevFmtUInt;
else
throw al::backend_exception{al::backend_error::DeviceError,
"Unhandled sample format: %s %u-bit", (par.sig?"signed":"unsigned"), par.bps*8};
mFrameStep = par.pchan;
if(par.pchan != mDevice->channelsFromFmt())
{
WARN("Got %u channel%s for %s\n", par.pchan, (par.pchan==1)?"":"s",
DevFmtChannelsString(mDevice->FmtChans));
if(par.pchan < 2) mDevice->FmtChans = DevFmtMono;
else mDevice->FmtChans = DevFmtStereo;
}
mDevice->Frequency = par.rate;
setDefaultChannelOrder();
mDevice->UpdateSize = par.round;
mDevice->BufferSize = par.bufsz + par.round;
mBuffer.resize(mDevice->UpdateSize * par.pchan*par.bps);
if(par.sig == 1)
std::fill(mBuffer.begin(), mBuffer.end(), al::byte{});
else if(par.bits == 8)
std::fill_n(mBuffer.data(), mBuffer.size(), al::byte(0x80));
else if(par.bits == 16)
std::fill_n(reinterpret_cast<uint16_t*>(mBuffer.data()), mBuffer.size()/2, 0x8000);
else if(par.bits == 32)
std::fill_n(reinterpret_cast<uint32_t*>(mBuffer.data()), mBuffer.size()/4, 0x80000000u);
return true;
}
void SndioPlayback::start()
{
if(!sio_start(mSndHandle))
throw al::backend_exception{al::backend_error::DeviceError, "Error starting playback"};
try {
mKillNow.store(false, std::memory_order_release);
mThread = std::thread{std::mem_fn(&SndioPlayback::mixerProc), this};
}
catch(std::exception& e) {
sio_stop(mSndHandle);
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to start mixing thread: %s", e.what()};
}
}
void SndioPlayback::stop()
{
if(mKillNow.exchange(true, std::memory_order_acq_rel) || !mThread.joinable())
return;
mThread.join();
if(!sio_stop(mSndHandle))
ERR("Error stopping device\n");
}
/* TODO: This could be improved by avoiding the ring buffer and record thread,
* counting the available samples with the sio_onmove callback and reading
* directly from the device. However, this depends on reasonable support for
* capture buffer sizes apps may request.
*/
struct SndioCapture final : public BackendBase {
SndioCapture(DeviceBase *device) noexcept : BackendBase{device} { }
~SndioCapture() override;
int recordProc();
void open(const char *name) override;
void start() override;
void stop() override;
void captureSamples(al::byte *buffer, uint samples) override;
uint availableSamples() override;
sio_hdl *mSndHandle{nullptr};
RingBufferPtr mRing;
std::atomic<bool> mKillNow{true};
std::thread mThread;
DEF_NEWDEL(SndioCapture)
};
SndioCapture::~SndioCapture()
{
if(mSndHandle)
sio_close(mSndHandle);
mSndHandle = nullptr;
}
int SndioCapture::recordProc()
{
SetRTPriority();
althrd_setname(RECORD_THREAD_NAME);
const uint frameSize{mDevice->frameSizeFromFmt()};
int nfds_pre{sio_nfds(mSndHandle)};
if(nfds_pre <= 0)
{
mDevice->handleDisconnect("Incorrect return value from sio_nfds(): %d", nfds_pre);
return 1;
}
auto fds = std::make_unique<pollfd[]>(static_cast<uint>(nfds_pre));
while(!mKillNow.load(std::memory_order_acquire)
&& mDevice->Connected.load(std::memory_order_acquire))
{
/* Wait until there's some samples to read. */
const int nfds{sio_pollfd(mSndHandle, fds.get(), POLLIN)};
if(nfds <= 0)
{
mDevice->handleDisconnect("Failed to get polling fds: %d", nfds);
break;
}
int pollres{::poll(fds.get(), static_cast<uint>(nfds), 2000)};
if(pollres < 0)
{
if(errno == EINTR) continue;
mDevice->handleDisconnect("Poll error: %s", strerror(errno));
break;
}
if(pollres == 0)
continue;
const int revents{sio_revents(mSndHandle, fds.get())};
if((revents&POLLHUP))
{
mDevice->handleDisconnect("Got POLLHUP from poll events");
break;
}
if(!(revents&POLLIN))
continue;
auto data = mRing->getWriteVector();
al::span<al::byte> buffer{data.first.buf, data.first.len*frameSize};
while(!buffer.empty())
{
size_t got{sio_read(mSndHandle, buffer.data(), buffer.size())};
if(got == 0)
break;
if(got > buffer.size())
{
ERR("sio_read failed: 0x%" PRIx64 "\n", got);
mDevice->handleDisconnect("sio_read failed: 0x%" PRIx64, got);
break;
}
mRing->writeAdvance(got / frameSize);
buffer = buffer.subspan(got);
if(buffer.empty())
{
data = mRing->getWriteVector();
buffer = {data.first.buf, data.first.len*frameSize};
}
}
if(buffer.empty())
{
/* Got samples to read, but no place to store it. Drop it. */
static char junk[4096];
sio_read(mSndHandle, junk, sizeof(junk) - (sizeof(junk)%frameSize));
}
}
return 0;
}
void SndioCapture::open(const char *name)
{
if(!name)
name = sndio_device;
else if(strcmp(name, sndio_device) != 0)
throw al::backend_exception{al::backend_error::NoDevice, "Device name \"%s\" not found",
name};
mSndHandle = sio_open(nullptr, SIO_REC, true);
if(mSndHandle == nullptr)
throw al::backend_exception{al::backend_error::NoDevice, "Could not open backend device"};
SioPar par;
switch(mDevice->FmtType)
{
case DevFmtByte:
par.bits = 8;
par.sig = 1;
break;
case DevFmtUByte:
par.bits = 8;
par.sig = 0;
break;
case DevFmtShort:
par.bits = 16;
par.sig = 1;
break;
case DevFmtUShort:
par.bits = 16;
par.sig = 0;
break;
case DevFmtInt:
par.bits = 32;
par.sig = 1;
break;
case DevFmtUInt:
par.bits = 32;
par.sig = 0;
break;
case DevFmtFloat:
throw al::backend_exception{al::backend_error::DeviceError,
"%s capture samples not supported", DevFmtTypeString(mDevice->FmtType)};
}
par.bps = SIO_BPS(par.bits);
par.le = SIO_LE_NATIVE;
par.msb = 1;
par.rchan = mDevice->channelsFromFmt();
par.rate = mDevice->Frequency;
par.appbufsz = maxu(mDevice->BufferSize, mDevice->Frequency/10);
par.round = minu(par.appbufsz/2, mDevice->Frequency/40);
if(!sio_setpar(mSndHandle, &par) || !sio_getpar(mSndHandle, &par))
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to set device praameters"};
if(par.bps > 1 && par.le != SIO_LE_NATIVE)
throw al::backend_exception{al::backend_error::DeviceError,
"%s-endian samples not supported", par.le ? "Little" : "Big"};
if(par.bits < par.bps*8 && !par.msb)
throw al::backend_exception{al::backend_error::DeviceError,
"Padded samples not supported (got %u of %u bits)", par.bits, par.bps*8};
auto match_fmt = [](DevFmtType fmttype, const sio_par &p) -> bool
{
return (fmttype == DevFmtByte && p.bps == 1 && p.sig != 0)
|| (fmttype == DevFmtUByte && p.bps == 1 && p.sig == 0)
|| (fmttype == DevFmtShort && p.bps == 2 && p.sig != 0)
|| (fmttype == DevFmtUShort && p.bps == 2 && p.sig == 0)
|| (fmttype == DevFmtInt && p.bps == 4 && p.sig != 0)
|| (fmttype == DevFmtUInt && p.bps == 4 && p.sig == 0);
};
if(!match_fmt(mDevice->FmtType, par) || mDevice->channelsFromFmt() != par.rchan
|| mDevice->Frequency != par.rate)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to set format %s %s %uhz, got %c%u %u-channel %uhz instead",
DevFmtTypeString(mDevice->FmtType), DevFmtChannelsString(mDevice->FmtChans),
mDevice->Frequency, par.sig?'s':'u', par.bps*8, par.rchan, par.rate};
mRing = RingBuffer::Create(mDevice->BufferSize, par.bps*par.rchan, false);
mDevice->BufferSize = static_cast<uint>(mRing->writeSpace());
mDevice->UpdateSize = par.round;
setDefaultChannelOrder();
mDevice->DeviceName = name;
}
void SndioCapture::start()
{
if(!sio_start(mSndHandle))
throw al::backend_exception{al::backend_error::DeviceError, "Error starting capture"};
try {
mKillNow.store(false, std::memory_order_release);
mThread = std::thread{std::mem_fn(&SndioCapture::recordProc), this};
}
catch(std::exception& e) {
sio_stop(mSndHandle);
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to start capture thread: %s", e.what()};
}
}
void SndioCapture::stop()
{
if(mKillNow.exchange(true, std::memory_order_acq_rel) || !mThread.joinable())
return;
mThread.join();
if(!sio_stop(mSndHandle))
ERR("Error stopping device\n");
}
void SndioCapture::captureSamples(al::byte *buffer, uint samples)
{ mRing->read(buffer, samples); }
uint SndioCapture::availableSamples()
{ return static_cast<uint>(mRing->readSpace()); }
} // namespace
BackendFactory &SndIOBackendFactory::getFactory()
{
static SndIOBackendFactory factory{};
return factory;
}
bool SndIOBackendFactory::init()
{ return true; }
bool SndIOBackendFactory::querySupport(BackendType type)
{ return (type == BackendType::Playback || type == BackendType::Capture); }
std::string SndIOBackendFactory::probe(BackendType type)
{
std::string outnames;
switch(type)
{
case BackendType::Playback:
case BackendType::Capture:
/* Includes null char. */
outnames.append(sndio_device, sizeof(sndio_device));
break;
}
return outnames;
}
BackendPtr SndIOBackendFactory::createBackend(DeviceBase *device, BackendType type)
{
if(type == BackendType::Playback)
return BackendPtr{new SndioPlayback{device}};
if(type == BackendType::Capture)
return BackendPtr{new SndioCapture{device}};
return nullptr;
}
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