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Re-add latency bounding on the SDL audio renderer

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This commit is contained in:
Cameron Gutman 2019-06-23 13:14:55 -07:00
parent 01254f67f0
commit c88651939a
2 changed files with 20 additions and 2 deletions
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2
app/streaming/audio/renderers/sdl.h
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@ -21,4 +21,6 @@ public:
private:
SDL_AudioDeviceID m_AudioDevice;
void* m_AudioBuffer;
int m_FrameDurationMs;
int m_FrameSize;
};

20
app/streaming/audio/renderers/sdlaud.cpp
View file

@ -33,6 +33,9 @@ bool SdlAudioRenderer::prepareForPlayback(const OPUS_MULTISTREAM_CONFIGURATION*
// Specifying non-Po2 seems to work for our supported platforms.
want.samples = opusConfig->samplesPerFrame;
m_FrameSize = opusConfig->samplesPerFrame * sizeof(short) * opusConfig->channelCount;
m_FrameDurationMs = opusConfig->samplesPerFrame / 48;
m_AudioDevice = SDL_OpenAudioDevice(NULL, 0, &want, &have, 0);
if (m_AudioDevice == 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
@ -41,7 +44,7 @@ bool SdlAudioRenderer::prepareForPlayback(const OPUS_MULTISTREAM_CONFIGURATION*
return false;
}
m_AudioBuffer = malloc(opusConfig->samplesPerFrame * sizeof(short) * opusConfig->channelCount);
m_AudioBuffer = malloc(m_FrameSize);
if (m_AudioBuffer == nullptr) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Failed to allocate audio buffer");
@ -92,6 +95,18 @@ bool SdlAudioRenderer::submitAudio(int bytesWritten)
return true;
}
// Don't queue if there's already more than 30 ms of audio data waiting
// in Moonlight's audio queue.
if (LiGetPendingAudioFrames() * m_FrameDurationMs > 30) {
return true;
}
// Provide backpressure on the queue to ensure too many frames don't build up
// in SDL's audio queue.
while (SDL_GetQueuedAudioSize(m_AudioDevice) / m_FrameSize > 10) {
SDL_Delay(1);
}
if (SDL_QueueAudio(m_AudioDevice, m_AudioBuffer, bytesWritten) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Failed to queue audio sample: %s",
@ -103,5 +118,6 @@ bool SdlAudioRenderer::submitAudio(int bytesWritten)
int SdlAudioRenderer::getCapabilities()
{
return CAPABILITY_DIRECT_SUBMIT;
// Direct submit can't be used because we use LiGetPendingAudioFrames()
return 0;
}