[wdmaudiodev] sample rate control on Vista
- From: "Nikolay V. Pyatkov" <npyatkov@xxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Sun, 16 Jul 2006 18:21:37 -0400
Hi,
We have an input only WDM portcls audio driver on Vista 5456. The driver can
support 48,000 and 44,100 sample rate. The application needs to open this
driver at 48,000. Here is the code:
WAVEFORMATEX wf;
wf.wFormatTag   Â= WAVE_FORMAT_PCM;
wf.nChannels    = 2;
wf.nSamplesPerSec Â= 48000;
wf.nAvgBytesPerSec = 192000;
wf.nBlockAlign   = nBlockAlign;
wf.wBitsPerSample Â= UCODEC_BIT_PER_SAMPLE_PCM;
wf.cbSize     Â= 0;
mmResult = waveInOpen(
&m_hWaveIn,
nInputDeviceId,
&m_WaveFormat,
(DWORD_PTR)m_hWaveInEvent,
0,
CALLBACK_EVENT);
mmResult is 0.
But the trace in the driver shows:
00000431 9.63108540 ValidatePcm :
00000432 9.63109016 ---- cbSize = 22
00000433 9.63109398 ---- nChannels = 2
00000434 9.63109875 ---- nSamplesPerSec = 44100
00000435 9.63110352 ---- wBitsPerSample = 16
The Vista audio subsystem took the parameters from "Audio
Devices->Recording->My Device->Properties->Options" .If I manually modify
value in the Options panel Vista will use the value to open my device.
I tried to check/uncheck "exclusive control" box. Does not help. How do I get
control over the bit rate back to the application?
Thanks,
Nikolay
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