[wdmaudiodev] Re: looped streaming

  • From: AI Developer <developer@xxxxxxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 24 May 2010 19:34:58 +0530

IIRC, looped streaming is also used by DirectSound clients, under certain situations. This used to create a problem with some DVD player apps - which would not work with the USB Audio Class devices as the USB Audio Class drivers did not use PortCls.

Thanks.
Devendra.

Eugene Muzychenko wrote:
Hello Nikolay,

  
Can you point me the source?
    
Unfortunately, there is no source, as for many other issues with MS
software. PortCls exposes both KSINTERFACE_STANDARD_STREAMING and
KSINTERFACE_STANDARD_LOOPED_STREAMING for WaveCyclic/WavePci
interfaces but KSINTERFACE_STANDARD_LOOPED_STREAMING is almost useless
in this case (it is similar to WHDR_BEGINLOOP/WHDR_ENDLOOP flags in
WAVEHDR and allows to loop only a constant audio data).

For WaveRt interface, PortCls exposes only
KSINTERFACE_STANDARD_LOOPED_STREAMING.

Regards,
Eugene

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