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audio: drain the AudioOut2 queue at an exact 48 kHz grain rate

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This commit is contained in:
nmzik
2026-10-27 18:17:51 +01:00
parent 64a554dea7
commit 7ff8aff5e6
2 changed files with 37 additions and 11 deletions
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src/libs/libAudio2.cpp
+12 -9
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@@ -262,6 +262,11 @@ static AudioOut2Submission& audioout2_submission(const AudioOut2ContextState& co
return g_audioout2_submissions[&context - g_audioout2_contexts.data()];
}
// Ticks of a sixth of a microsecond: one 48 kHz sample lasts exactly 125 of them.
static uint64_t audioout2_clock() {
return LibKernel::KernelGetProcessTime() * 6;
}
static uint32_t audioout2_grain_micros(uint32_t grains) {
const auto sample_count = (grains == 0 ? 512u : grains);
return std::max<uint32_t>((sample_count * 1000000u) / 48000u, 1000u);
@@ -331,25 +336,23 @@ static void audioout2_update_context_locked(AudioOut2ContextState* state) {
return;
}
const auto now = LibKernel::KernelGetProcessTime();
const auto now = audioout2_clock();
if (state->last_update == 0 || state->queued == 0) {
state->last_update = now;
return;
}
const auto grain_micros = static_cast<uint64_t>(audioout2_grain_micros(state->num_grains));
if (now <= state->last_update || grain_micros == 0) {
if (now <= state->last_update) {
return;
}
const auto elapsed = now - state->last_update;
const auto drained = std::min<uint64_t>(state->queued, elapsed / grain_micros);
const auto grain = uint64_t {state->num_grains} * 125;
const auto drained = std::min<uint64_t>(state->queued, (now - state->last_update) / grain);
if (drained == 0) {
return;
}
state->queued -= static_cast<uint32_t>(drained);
state->last_update += drained * grain_micros;
state->last_update += drained * grain;
if (state->queued == 0) {
state->last_update = now;
}
@@ -527,7 +530,7 @@ int KYTY_SYSV_ABI AudioOut2ContextCreate(const AudioOut2ContextParam* params, vo
state->handle = *ctx;
state->queue_depth = params->queue_depth == 0 ? 4u : params->queue_depth;
state->num_grains = num_grains;
state->last_update = LibKernel::KernelGetProcessTime();
state->last_update = audioout2_clock();
state->object_audio_handle = object_audio_handle;
g_audioout2_state_mutex.Unlock();
@@ -615,7 +618,7 @@ int KYTY_SYSV_ABI AudioOut2ContextPush(AudioOut2ContextHandle ctx, uint32_t bloc
sleep_micros = audioout2_grain_micros(state->num_grains);
if (state->queued < state->queue_depth || use_device_clock) {
if (state->queued == 0) {
state->last_update = LibKernel::KernelGetProcessTime();
state->last_update = audioout2_clock();
}
if (state->queued < state->queue_depth) {
state->queued++;