[wdmaudiodev] Timestamp source for KSAUDIO_POSITIONEX
- From: Eugene Muzychenko <eugene@xxxxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 8 Jan 2013 13:38:12 +0700
Hello!
MSDN docs say that KSAUDIO_POSITIONEX descriptor used in
KSPROPERTY_AUDIO_POSITIONEX property request should be filled with
timestamp values but say nothing about timestamp source requirements
(for example, counter frequency and/or resolution).
KSPROPERTY_AUDIO_POSITIONEX request is issued by Windows audio engine
during processing IAudioCaptureClient::GetBuffer and
IAudioClock::GetPosition. For these methods, it is explicitly said
that QueryPerformanceCounter is used.
Does it mean that a developer that uses WASAPI can suppose that all
timestamps are generated by QueryPerformanceCounter and each audio
filter must use KeQueryPerformanceCounter to fill KSAUDIO_POSITIONEX
fields?
Regards,
Eugene
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