[wdmaudiodev] Re: WaveFormatExtensible - problems about the number of channels
- From: Waldemar Haszlakiewicz <waldemar.haszlakiewicz@xxxxxxxx>
- To: Ionut Mihai Voiculet <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sun, 15 Jun 2003 22:55:16 +0200
Check the old board messages->there is an example for directks. Maybe
it includes something about that too.
Look for directks.exe.
Waldemar
IMV> Hi !
IMV> I'm new to this group, so please be patient with me. First of all, I don't
IMV> do driver development, but I write the audio I/O for a professional
IMV> multitrack software. We currently support MME, DirectSound and ASIO. We
want
IMV> to support the WDM style multichannel soundcards (that don't have an ASIO
IMV> driver). To do so, we use the WaveFormatExtensible structure in
DirectSound.
IMV> I've managed (very simple) to output to several channels using the
WAVE_EX,
IMV> but I have a __MAJOR__ problem. I don't know how to get the real number of
IMV> channels the soundcard has. I found no information everywhere about this
IMV> (I've checked on the Internet, PortAudio and other forums, the DirectX 9
IMV> SDK, etc). The only idea I've got, was to query the MME driver for the
IMV> number of channels using the "waveOutGetDevCaps". However, for ALL
IMV> soundcards that I've tested it (SoundBlaster Audigy, Midiman, onboard
ones,
IMV> etc), the "lpCaps.wChannels" always reports 65536 (0xFFFF) or 2 channels.
IMV> Because I don't know how to get the actual number of the channel the
device
IMV> has, I just can't use the WAVE_EX struct.
IMV> So PLEASE, if anybody has any idea about this, please reply. I do believe
IMV> that this is the only place on the Internet where I can get the answer for
IMV> this.
IMV> VIM
IMV> netvim@xxxxxxxxxxx
IMV> _________________________________________________________________
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