void OpenALStream::InitializeSoundLoop()
{
#ifdef AL_FORMAT_51CHN16
bool surroundsupported = SupportSurroundOutput();
format = surroundsupported ? AL_FORMAT_51CHN16 : AL_FORMAT_STEREO16;
#else
bool surroundsupported = false;
format = AL_FORMAT_STEREO16;
#endif
samplesize = surroundsupported ? SOUND_SAMPLES_SURROUND : SOUND_SAMPLES_STEREO;
ulFrequency = m_mixer->GetSampleRate();
numBuffers = SConfig::GetInstance().iLatency + SOUND_BUFFER_COUNT; // OpenAL requires a minimum of two buffers
memset(uiBuffers, 0, numBuffers * sizeof(ALuint));
uiSource = 0;
// Generate a Source to playback the Buffers
alGenSources(1, &uiSource);
// Generate some AL Buffers for streaming
alGenBuffers(numBuffers, (ALuint *)uiBuffers);
// Set the default sound volume as saved in the config file.
alSourcef(uiSource, AL_GAIN, fVolume);
s16* temp = new s16[SOUND_FRAME_SIZE * samplesize];
memset(temp, 0, SOUND_FRAME_SIZE * samplesize * sizeof(u16));
for (u8 i = 0; i < numBuffers; i++)
{
alBufferData(uiBuffers[i], format, temp, SOUND_FRAME_SIZE * samplesize * sizeof(u16), ulFrequency);
}
delete[] temp;
alSourceQueueBuffers(uiSource, numBuffers, uiBuffers);
alSourcePlay(uiSource);
}
// The audio thread.
void SoundStream::SoundLoop()
{
Common::SetCurrentThreadName("Audio thread");
InitializeSoundLoop();
bool surroundSupported = SupportSurroundOutput() && SConfig::GetInstance().bDPL2Decoder;
memset(realtimeBuffer, 0, SOUND_MAX_FRAME_SIZE * sizeof(u16));
memset(dpl2buffer, 0, SOUND_MAX_FRAME_SIZE * sizeof(soundtouch::SAMPLETYPE));
memset(samplebuffer, 0, SOUND_MAX_FRAME_SIZE * sizeof(soundtouch::SAMPLETYPE));
u32 channelmultiplier = surroundSupported ? SOUND_SAMPLES_SURROUND : SOUND_SAMPLES_STEREO;
CMixer* mixer = GetMixer();
if (SConfig::GetInstance().bTimeStretching)
{
float ratemultiplier = 1.0f;
soundtouch::SoundTouch sTouch;
sTouch.setChannels(2);
sTouch.setSampleRate(mixer->GetSampleRate());
sTouch.setTempo(1.0);
sTouch.setSetting(SETTING_USE_QUICKSEEK, 0);
sTouch.setSetting(SETTING_USE_AA_FILTER, 1);
while (threadData.load())
{
u32 availablesamples = mixer->AvailableSamples();
u32 numsamples = std::min(availablesamples, 400u);
if (numsamples == 400u)
{
float rate = mixer->GetCurrentSpeed();
if (rate <= 0)
{
rate = 1.0f;
}
numsamples = mixer->Mix(samplebuffer, numsamples);
rate *= ratemultiplier;
rate = rate < 0.5f ? 0.5f : rate;
rate = roundf(rate * 16.0f) / 16.0f;
sTouch.setTempo(rate);
sTouch.putSamples(samplebuffer, numsamples);
}
u32 samplesneeded = SamplesNeeded();
availablesamples = sTouch.numSamples();
if (samplesneeded >= SOUND_FRAME_SIZE && availablesamples > 0)
{
ratemultiplier = std::fmaxf(std::fminf((float)availablesamples / (float)samplesneeded, 1.1f), 0.9f);
numsamples = std::min(availablesamples, SOUND_FRAME_SIZE);
if (surroundSupported)
{
numsamples = sTouch.receiveSamples(dpl2buffer, numsamples);
DPL2Decode(dpl2buffer, numsamples, samplebuffer);
}
else
{
numsamples = sTouch.receiveSamples(samplebuffer, numsamples);
}
floatTos16(realtimeBuffer, samplebuffer, numsamples, channelmultiplier);
WriteSamples(realtimeBuffer, numsamples);
}
else
{
Common::SleepCurrentThread(1);
}
}
}
else
{
while (threadData.load())
{
u32 neededsamples = std::min(SamplesNeeded(), SOUND_FRAME_SIZE);
u32 availablesamples = mixer->AvailableSamples() & (~(0xF));
if (neededsamples == SOUND_FRAME_SIZE && availablesamples > 0)
{
u32 numsamples = std::min(availablesamples, neededsamples);
if (surroundSupported)
{
numsamples = mixer->Mix(dpl2buffer, numsamples);
DPL2Decode(dpl2buffer, numsamples, samplebuffer);
floatTos16(realtimeBuffer, samplebuffer, numsamples, channelmultiplier);
}
else
{
numsamples = mixer->Mix(realtimeBuffer, numsamples);
}
WriteSamples(realtimeBuffer, numsamples);
}
else
{
Common::SleepCurrentThread(1);
}
}
}
}
