On Thu, 18 Jul 2002 [EMAIL PROTECTED] wrote: > What do i have to do, to play just 1 wav file on 1 channel (i mean: not > 8 at the same time). That would solve all my problems ;). If i play > something now, it uses all the channels.
Have you tried ecasound - http://www.eca.cx/ecasound ...? # play mono-wav file on ch 1 ecasound -i foo.wav -f:s32_le,10,44100 -o alsa,default # play mono-wav file on ch 8 ecasound -i foo.wav -f:s32_le,10,44100,n -o alsa,default -erc:1,8 -eac:0,1 # play stereo-wav on channels 7 and 8 ecasound -i foo.wav -f:s32_le,10,44100,n -o alsa,default \ -erc:1,7 -erc:2,8 -eac:0,1 -eac:0,2 ... and so on. Here the soundcard is opened through the ALSA plugin layer, using non-interleaved access, 10 channels, 32bit (little-endian) and 44100Hz. This configuration should work on RME9652 without any changes to asoundrc or to other configuration files. Also direct hw-access (replacing 'alsa,default' with 'alsa,hw:0') should work with these params. Anyways, you can freely route audio between channels. If you need to repeatedly do the same tasks, you should probably write a small shell-script. Ecasound also understands mp3s, oggs, aiff, etc files... The used operators are -erc (channel-copy) and -eac (channel-amplify). For instance '-erc:1,8 -eac:0,1' copies the audio data from channel 1 to channel 8, and then -eac mutes the first channel. Another possibly useful operator is -erm (channel-mix). It allows you to downmix all channels of one chain (= one logical audio stream) to a single channel. Check... http://www.wakkanet.fi/~kaiv/ecasound/Documentation/examples.html http://www.wakkanet.fi/~kaiv/ecasound/Documentation/users_guide/users_guide.html ... for an introduction to ecasound use. As multichannel devices are becoming more and more common, I'm planning to add a few more channel routing ops... for instance: -ercs:frompair,topair stereo-pair copy; copy pairs of channels -err:from,to channel-route, shorthand for the -erc+-eac combination; mutes the source channel -errs:frompair,topair stereo-pair route; like -ercs but to stereo-pairs But these pretty are much just shorthands for existing functionality. PS One known multichannel-related problem in ecasound is routing multichannel inputs efficiently to separate chains. While it is possible (and has been for a long time), it can be _very_ inefficient. The absolute worst-case is mixing 26 channels from an RME9652 to 26 ecasound chains. At 44.1kHz, that would result in ~1Gbit/s of memory i/o. Ugh. Fortunately there is a solution to this, and that's to use JACK. Then instead of reading data from one 26ch ALSA device, ecasound registers 26 mono JACK-clients. -- http://www.eca.cx Audio software for Linux! ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
