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AudioStream: Replace buffer queue with ring buffer

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Should achieve a decent overall minimum latency reduction.
This commit is contained in:
Connor McLaughlin
2020-06-06 14:40:20 +10:00
parent 6acd8b27dd
commit 531c3ad5fa
16 changed files with 205 additions and 253 deletions
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33
src/common/cubeb_audio_stream.cpp
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@ -56,9 +56,21 @@ bool CubebAudioStream::OpenDevice()
Log_InfoPrintf("Minimum latency in frames: %u", latency_frames);
if (latency_frames > m_buffer_size)
Log_WarningPrintf("Minimum latency is above buffer size: %u vs %u", latency_frames, m_buffer_size);
{
Log_WarningPrintf("Minimum latency is above buffer size: %u vs %u, adjusting to compensate.", latency_frames,
m_buffer_size);
if (!SetBufferSize(latency_frames))
{
Log_ErrorPrintf("Failed to set new buffer size of %u frames", latency_frames);
DestroyContext();
return false;
}
}
else
{
latency_frames = m_buffer_size;
}
char stream_name[32];
std::snprintf(stream_name, sizeof(stream_name), "AudioStream_%p", this);
@ -72,6 +84,7 @@ bool CubebAudioStream::OpenDevice()
return false;
}
cubeb_stream_set_volume(m_cubeb_stream, static_cast<float>(m_output_volume) / 100.0f);
return true;
}
@ -106,15 +119,13 @@ long CubebAudioStream::DataCallback(cubeb_stream* stm, void* user_ptr, const voi
{
CubebAudioStream* const this_ptr = static_cast<CubebAudioStream*>(user_ptr);
const u32 read_frames =
this_ptr->ReadSamples(reinterpret_cast<SampleType*>(output_buffer), static_cast<u32>(nframes));
const u32 silence_frames = static_cast<u32>(nframes) - read_frames;
if (silence_frames > 0)
if (this_ptr->m_output_volume_changed.load())
{
std::memset(reinterpret_cast<SampleType*>(output_buffer) + (read_frames * this_ptr->m_channels), 0,
silence_frames * this_ptr->m_channels * sizeof(SampleType));
this_ptr->m_output_volume_changed.store(false);
cubeb_stream_set_volume(this_ptr->m_cubeb_stream, static_cast<float>(this_ptr->m_output_volume) / 100.0f);
}
this_ptr->ReadFrames(reinterpret_cast<SampleType*>(output_buffer), static_cast<u32>(nframes), false);
return nframes;
}
@ -125,7 +136,7 @@ void CubebAudioStream::StateCallback(cubeb_stream* stream, void* user_ptr, cubeb
this_ptr->m_paused = (state != CUBEB_STATE_STARTED);
}
void CubebAudioStream::BufferAvailable() {}
void CubebAudioStream::FramesAvailable() {}
void CubebAudioStream::DestroyContext()
{
@ -138,6 +149,12 @@ void CubebAudioStream::DestroyContext()
#endif
}
void CubebAudioStream::SetOutputVolume(u32 volume)
{
AudioStream::SetOutputVolume(volume);
m_output_volume_changed.store(true);
}
std::unique_ptr<AudioStream> AudioStream::CreateCubebAudioStream()
{
return std::make_unique<CubebAudioStream>();