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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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tests/AudioOut2PortTests.cpp
+25 -2
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@@ -35,6 +35,8 @@ int g_open_waiters = 0;
bool g_block_opens = false;
bool g_block_outputs = false;
std::vector<int> g_blocked_output;
std::atomic_uint64_t g_process_time {0};
std::atomic_bool g_process_time_frozen {false};
void Check(bool value, const char* text) {
if (!value) {
@@ -465,6 +467,27 @@ void TestPushConsumesPcm() {
AudioOut2::AudioOut2ContextDestroy(context);
}
void TestQueueDrainsAtExactGrainRate() {
// Three 512-sample grains play in exactly 32000 us.
const auto context = CreateContext();
g_process_time_frozen = true;
const auto start = g_process_time.load();
for (int push = 0; push < 3; push++) {
Check(AudioOut2::AudioOut2ContextPush(context, 0) == OK, "async push failed");
}
const auto queued_after = [&](uint64_t micros) {
g_process_time = start + micros;
uint32_t queued = 0;
Check(AudioOut2::AudioOut2ContextGetQueueLevel(context, &queued, nullptr) == OK,
"queue-level query failed");
return queued;
};
Check(queued_after(31999) == 1, "the third grain drained before it finished playing");
Check(queued_after(32000) == 0, "three grains did not drain in their playing time");
g_process_time_frozen = false;
AudioOut2::AudioOut2ContextDestroy(context);
}
void TestPcmCopiedBeforeScratchBufferReuse() {
const auto context = CreateContext();
const auto param = MakeParam();
@@ -746,8 +769,7 @@ uint32_t AudioOutOutputs(const OutputParam* params, uint32_t num, bool blocking)
namespace Libs::LibKernel {
uint64_t KYTY_SYSV_ABI KernelGetProcessTime() {
static std::atomic_uint64_t now {0};
return now.fetch_add(1000);
return g_process_time_frozen ? g_process_time.load() : g_process_time.fetch_add(1000);
}
} // namespace Libs::LibKernel
@@ -764,6 +786,7 @@ int main() {
TestAsynchronousDevicePushKeepsQueueBounded();
TestHandleWithoutPcmDoesNotBypassQueue();
TestPushConsumesPcm();
TestQueueDrainsAtExactGrainRate();
TestPcmCopiedBeforeScratchBufferReuse();
TestPortGainAndValidation();
TestObjectGainAndAmbisonics();