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ao/wasapi: periodicity in shared mode must be zero

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IAudioClient::Initialize hnsPeriodicity argument is nonzero only for exclusive mode

http://msdn.microsoft.com/en-us/library/windows/desktop/dd370805%28v=vs.85%29.aspx
This commit is contained in:
Kevin Mitchell 2014-11-18 04:33:49 -08:00
parent c545c406fa
commit 19e9c9d1be
1 changed files with 6 additions and 3 deletions
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9
audio/out/ao_wasapi_utils.c
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@ -458,12 +458,15 @@ static HRESULT fix_format(struct ao *ao)
HRESULT hr;
double offset = 0.5;
REFERENCE_TIME devicePeriod, bufferDuration;
REFERENCE_TIME devicePeriod, bufferDuration, bufferPeriod;
MP_DBG(state, "IAudioClient::GetDevicePeriod\n");
hr = IAudioClient_GetDevicePeriod(state->pAudioClient,&devicePeriod, NULL);
MP_VERBOSE(state, "Device period: %.2g ms\n", (double) devicePeriod / 10000.0 );
/* integer multiple of device period close to 50ms */
bufferDuration = ceil( 50.0 * 10000.0 / devicePeriod ) * devicePeriod;
bufferPeriod = bufferDuration = ceil( 50.0 * 10000.0 / devicePeriod ) * devicePeriod;
if (state->share_mode == AUDCLNT_SHAREMODE_SHARED)
bufferPeriod = 0;
/* cargo cult code to negotiate buffer block size, affected by hardware/drivers combinations,
gradually grow it to 10s, by 0.5s, consider failure if it still doesn't work
@ -474,7 +477,7 @@ reinit:
state->share_mode,
AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
bufferDuration,
bufferDuration,
bufferPeriod,
&(state->format.Format),
NULL);
/* something about buffer sizes on Win7 */