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audio: Handle SDL audio queue stalls.

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This commit is contained in:
squidbus 2024-12-30 15:58:11 -08:00
parent cf4bd5446f
commit 3a02d2860c
1 changed files with 28 additions and 1 deletions
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29
src/core/libraries/audio/sdl_audio.cpp
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@ -13,7 +13,8 @@ namespace Libraries::AudioOut {
class SDLPortBackend : public PortBackend {
public:
explicit SDLPortBackend(const PortOut& port) : buffer_size(port.buffer_size) {
explicit SDLPortBackend(const PortOut& port)
: frame_size(port.frame_size), buffer_size(port.buffer_size) {
// We want the latency for delivering frames out to be as small as possible,
// so set the sample frames hint to the number of frames per buffer.
const auto samples_num_str = std::to_string(port.buffer_frames);
@ -32,6 +33,7 @@ public:
LOG_ERROR(Lib_AudioOut, "Failed to create SDL audio stream: {}", SDL_GetError());
return;
}
queue_threshold = CalculateQueueThreshold();
if (!SDL_ResumeAudioStreamDevice(stream)) {
LOG_ERROR(Lib_AudioOut, "Failed to resume SDL audio stream: {}", SDL_GetError());
SDL_DestroyAudioStream(stream);
@ -52,6 +54,17 @@ public:
if (!stream) {
return;
}
// AudioOut library manages timing, but we still need to guard against the SDL
// audio queue stalling, which may happen during device changes, for example.
// Otherwise, latency may grow over time unbounded.
if (const auto queued = SDL_GetAudioStreamQueued(stream); queued >= queue_threshold) {
LOG_WARNING(Lib_AudioOut,
"SDL audio queue backed up ({} queued, {} threshold), clearing.", queued,
queue_threshold);
SDL_ClearAudioStream(stream);
// Recalculate the threshold in case this happened because of a device change.
queue_threshold = CalculateQueueThreshold();
}
if (!SDL_PutAudioStreamData(stream, ptr, static_cast<int>(buffer_size))) {
LOG_ERROR(Lib_AudioOut, "Failed to output to SDL audio stream: {}", SDL_GetError());
}
@ -70,7 +83,21 @@ public:
}
private:
[[nodiscard]] u32 CalculateQueueThreshold() const {
SDL_AudioSpec discard;
int sdl_buffer_frames;
if (!SDL_GetAudioDeviceFormat(SDL_GetAudioStreamDevice(stream), &discard,
&sdl_buffer_frames)) {
LOG_WARNING(Lib_AudioOut, "Failed to get SDL audio stream buffer size: {}",
SDL_GetError());
sdl_buffer_frames = 0;
}
return std::max<u32>(buffer_size, sdl_buffer_frames * frame_size) * 4;
}
u32 frame_size;
u32 buffer_size;
u32 queue_threshold;
SDL_AudioStream* stream;
};