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Audio: support 12-channel AudioOut2 output with SDL (#498)

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* Audio: support 12-channel AudioOut2 output via stereo downmix

* Audio: document 7.1.4 downmix matrix and align s16 coefficients

* audio: use shared 12-to-8 channel conversion for SDL

---------

Co-authored-by: Airsoft Project <airsoft@example.com>
Co-authored-by: nmzik <Nmzik@mail.ru>
This commit is contained in:
Beru
2026-09-07 10:58:23 +02:00
committed by GitHub
parent f9b279c49d
commit bbe3bd0304
4 changed files with 79 additions and 37 deletions
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tests/AudioOut2PortTests.cpp
+26
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@@ -258,6 +258,31 @@ void TestSynchronousDevicePushBypassesModelledQueue() {
AudioOut2::AudioOut2ContextDestroy(context);
}
void TestFloat12ChannelPortOutputsPcm() {
const auto context = CreateContext();
const auto param = MakeParam(0x0c00);
AudioOut2::AudioOut2PortHandle port = 0;
Check(AudioOut2::AudioOut2PortCreate(context, AsParam(&param), &port) == OK,
"12-channel port create failed");
Check(LiveDeviceCount() == 1, "12-channel port did not open an audio device");
PortState state {};
Check(AudioOut2::AudioOut2PortGetState(port, AsState(&state)) == OK,
"12-channel port state query failed");
Check(state.num_channels == 12, "12-channel port lost its guest channel count");
float pcm[512 * 12] {};
SetPcm(port, pcm);
ResetOutputCalls();
Check(AudioOut2::AudioOut2ContextPush(context, 1) == OK, "12-channel PCM push failed");
const auto calls = OutputCalls();
Check(calls.size() == 1 && calls[0], "12-channel PCM did not reach the device backend");
AudioOut2::AudioOut2PortDestroy(port);
Check(LiveDeviceCount() == 0, "12-channel port leaked its audio device");
AudioOut2::AudioOut2ContextDestroy(context);
}
void TestAsynchronousDevicePushKeepsQueueBounded() {
const auto context = CreateContext(1);
const auto param = MakeParam();
@@ -361,6 +386,7 @@ int main() {
TestConcurrentCreates();
TestContextDestroyCancelsPendingCreate();
TestSynchronousDevicePushBypassesModelledQueue();
TestFloat12ChannelPortOutputsPcm();
TestAsynchronousDevicePushKeepsQueueBounded();
TestHandleWithoutPcmDoesNotBypassQueue();
std::printf("AudioOut2PortTests: all cases passed\n");