On Fri, 2004-01-23 at 01:52, Clemens Ladisch wrote: > John W. Cocula wrote: > > $ ./speaker-test -Drear -c 2 > > > > ALSA lib pcm.c:1812:(snd_pcm_open_conf) Invalid type for PCM rear definition (id: > > rear, value: cards.pcm.rear) > > Playback open error: Invalid argument > > You cannot access the rear channels seperately (at least not > directly). The ICH only supports 2-channel (front), 4-channel > (front+surround) and 6-channel (front+surr+center+lfe) output.
This is interesting... If I understand you correctly, you mean that the digital PCM data for the 4 channels or 6 channels must all be interleaved together and sent through a single device, just like the left and right channels of a stereo channel? If this is correct, would it be possible to set up a plug-in layer which opens the ICH hardware in 6-channel mode, but then provides three virtual stereo devices to applications? The plugin would just interleave, or multiplex the digital pcm data together, and insert silent "0" samples on any channel which wasn't opened by an application. Diagram: (each letter represents a 16-bit PCM sample) pcm stereo 1: ababab... --> |========| |hardware| pcm stereo 2: cdcdcd... --> | plugin |-->abcdefabcdef... -->|in 6 ch | pcm stereo 3: efefef... --> |========| | mode | My goal is to get my ICH-->realtech working in 6 channel output mode in a way that I can run three instances of Rhythmbox, streaming three totally independent stereo streams to three stereo amplifiers hooked to speakers in three different rooms :-) Hopefully this is not impossible? I'm willing to do some programming to make it happen, if the hardware can support it... Torrey > > > HTH > Clemens > > > > > ------------------------------------------------------- > The SF.Net email is sponsored by EclipseCon 2004 > Premiere Conference on Open Tools Development and Integration > See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. > http://www.eclipsecon.org/osdn > _______________________________________________ > Alsa-devel mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/alsa-devel -- Torrey Hoffman <[EMAIL PROTECTED]> ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
