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ao_wasapi: set 0 buffer duration on initialization for shared mode 

Microsoft requires that both `hnsBufferDuration` and `hnsPeriodicity` should be
0 when initializing a shared mode stream using event-driven buffering. Do as
they say.

Ref: https://learn.microsoft.com/en-us/windows/win32/api/audioclient/nf-audioclient-iaudioclient-initialize
This commit is contained in:
sunpenghao 2024-04-13 15:10:19 +08:00 committed by Kacper Michajłow
parent 503a0f184c
commit f75f32977c
1 changed files with 8 additions and 7 deletions
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15
audio/out/ao_wasapi_utils.c
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@ -646,10 +646,13 @@ static HRESULT fix_format(struct ao *ao, bool align_hack)
MP_VERBOSE(state, "Device period: default %lld us, minimum %lld us\n",
defaultPeriod / 10, minPeriod / 10);
// per Microsoft:
// * hnsBufferDuration = hnsPeriodicity = 0 for shared mode
// * hnsBufferDuration = hnsPeriodicity != 0 for exclusive mode
// https://learn.microsoft.com/en-us/windows/win32/api/audioclient/nf-audioclient-iaudioclient-initialize
REFERENCE_TIME bufferDuration;
if (state->share_mode == AUDCLNT_SHAREMODE_SHARED) {
// for shared mode, use integer multiple of device period close to 50ms
bufferDuration = defaultPeriod * ceil(50.0 * 10000.0 / defaultPeriod);
bufferDuration = 0;
} else if (state->opt_exclusive_buffer == 0) {
bufferDuration = defaultPeriod;
} else {
@ -671,17 +674,15 @@ static HRESULT fix_format(struct ao *ao, bool align_hack)
* state->bufferFrameCount));
}
MP_VERBOSE(state, "Trying buffer duration %lld us\n", bufferDuration / 10);
REFERENCE_TIME bufferPeriod =
state->share_mode == AUDCLNT_SHAREMODE_EXCLUSIVE ? bufferDuration : 0;
if (state->share_mode == AUDCLNT_SHAREMODE_EXCLUSIVE)
MP_VERBOSE(state, "Trying buffer duration %lld us\n", bufferDuration / 10);
MP_DBG(state, "IAudioClient::Initialize\n");
hr = IAudioClient_Initialize(state->pAudioClient,
state->share_mode,
AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
bufferDuration,
bufferPeriod,
bufferDuration,
&(state->format.Format),
NULL);
EXIT_ON_ERROR(hr);