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wmme: document default device selection algorithm

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This commit is contained in:
Ross Bencina 2016-09-11 00:14:49 +10:00
commit cd0eb352f3
1 changed files with 10 additions and 0 deletions
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10
src/hostapi/wmme/pa_win_wmme.c
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@ -1018,6 +1018,16 @@ PaError PaWinMme_Initialize( PaUtilHostApiRepresentation **hostApi, PaHostApiInd
winMmeHostApi->inputDeviceCount = 0;
winMmeHostApi->outputDeviceCount = 0;
/* Default device determination:
Here we query for the system preferred input and output devices using
DRVM_MAPPER_PREFERRED_GET; on error fall back to WAVE_MAPPER. Preferred
devices are stored in wave{In, Out}PreferredDevice.
When enumerating devices, set PA default devices to the MME devices
with ids matching wave{In, Out}PreferredDevice. If such devices are not
encountered during enumeration, the first device enumerated for each of
{input, output} will be selected as the PA default device.
*/
preferredDeviceStatusFlags = 0;
waveInPreferredDevice = WAVE_MAPPER;
if( waveInMessage( (HWAVEIN)WAVE_MAPPER, DRVM_MAPPER_PREFERRED_GET, (DWORD_PTR)&waveInPreferredDevice, (DWORD_PTR)&preferredDeviceStatusFlags ) != MMSYSERR_NOERROR )