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fix AudioOut pacing

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Co-authored-by: Stefanos Costa <stefanos.costa1999@gmail.com>
This commit is contained in:
nmzik
2026-08-05 02:17:25 +02:00
parent f06d7e6084
commit f380d69b9d
4 changed files with 164 additions and 11 deletions
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src/libs/libAudio2.cpp
+21 -2
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@@ -336,6 +336,17 @@ static AudioOut2PortStateEntry* audioout2_find_port_locked(AudioOut2PortHandle p
return nullptr;
}
static bool audioout2_context_has_queueable_device(AudioOut2ContextHandle ctx) {
Common::LockGuard lock(g_audioout2_port_mutex);
for (const auto& state: g_audioout2_ports) {
if (state.used && state.context == ctx && state.audio_handle > 0 &&
state.pcm_data != nullptr && AudioInternal::AudioOutHasDevice(state.audio_handle)) {
return true;
}
}
return false;
}
static void audioout2_queue_context_audio(AudioOut2ContextHandle ctx, bool blocking) {
std::vector<AudioInternal::OutputParam> params;
params.reserve(AudioInternal::OUT_PORTS_MAX);
@@ -493,15 +504,23 @@ int KYTY_SYSV_ABI AudioOut2ContextPush(AudioOut2ContextHandle ctx, uint32_t bloc
uint32_t sleep_micros = audioout2_grain_micros(512);
for (;;) {
// Only a synchronous submission carrying PCM to a real device can rely on the SDL queue for
// pacing. Async pushes must retain queue-depth backpressure, and a handle without PCM (or a
// vibration/failed-open handle) has no downstream operation that can block this call.
const bool use_device_clock =
blocking != 0 && audioout2_context_has_queueable_device(ctx);
g_audioout2_context_mutex.Lock();
if (auto* state = audioout2_find_context_locked(ctx); state != nullptr) {
audioout2_update_context_locked(state);
sleep_micros = audioout2_grain_micros(state->num_grains);
if (state->queued < state->queue_depth) {
if (state->queued < state->queue_depth || use_device_clock) {
if (state->queued == 0) {
state->last_update = LibKernel::KernelGetProcessTime();
}
state->queued++;
if (state->queued < state->queue_depth) {
state->queued++;
}
g_audioout2_context_mutex.Unlock();
audioout2_queue_context_audio(ctx, blocking != 0);
return OK;