[wdmaudiodev] How do I allow a WASAPI stream to vari-speed in relation to the device?
- From: Glenn Hughes <ghughes02138@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 29 Jun 2012 21:50:26 -0400
This is more a WASAPI api question than a driver question, and so, this is probably off topic, but I'm not getting any answers at Stack Overflow, so I thought someone on this list might have an idea. I'm writing an audio client using the WASAPI api. What I'm noticing is if the audio hardware sample rate is adjusted, I get clicks and drop-outs in my playback. Other WASAPI audio clients don't seem to have this problem. I am using the event-driven technique in shared mode. When my output wakes up, I find out how much space is available (client buffer size - padding) and I write that many samples. If I calculate the effective sample rate of output, it remains constant (within the margin of error) even if I have modified the actual hardware rate significantly. For example if I initialize the stream at 44100, the calculated output rate always hangs right around 44100, even if I have the hardware actually running at 45000 or even higher. This leads me to believe there's something I need to do to signal my willingness to run at a rate other than than the initial nominal rate. I've looked at the AUDCLNT_STREAMFLAGS_RATEADJUST flag, and the IAudioClockAdjustment API, but these don't seem related. Any advice would be greatly appreciated! Glenn Hughes ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/
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- » [wdmaudiodev] How do I allow a WASAPI stream to vari-speed in relation to the device? - Glenn Hughes