[linux-audio-user] multiple unsynced cards

I just managed to get the code from Jeorn working on my crappy cards here. (it also allows me to use a crappy card and my quattro together or I guess even all three for eight channels i/o ;) So that makes at least two people who have done this. As proof: ---- jackd -v -d alsa -d ttable -p 2096 jackd 0.37.2 Copyright 2001-2002 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details 10562 waiting for signals creating alsa driver ... ttable|2096|2|48000|swmon new client: alsa_pcm, id = 1 type 1 @ 0x80674f0 fd = 14 port alsa_pcm:in_1 buf shm key 0x2bda717e at offset 8384 bi = 0x80668c0 registered port alsa_pcm:in_1, offset = 8384 port alsa_pcm:in_2 buf shm key 0x2bda717e at offset 16768 bi = 0x80668d0 registered port alsa_pcm:in_2, offset = 16768 port alsa_pcm:in_3 buf shm key 0x2bda717e at offset 25152 bi = 0x80668e0 registered port alsa_pcm:in_3, offset = 25152 port alsa_pcm:in_4 buf shm key 0x2bda717e at offset 33536 bi = 0x80668f0 registered port alsa_pcm:in_4, offset = 33536 registered port alsa_pcm:out_1, offset = 0 registered port alsa_pcm:out_2, offset = 0 registered port alsa_pcm:out_3, offset = 0 registered port alsa_pcm:out_4, offset = 0 -- jack_rechain_graph(): client alsa_pcm: inprocess client, execution_order=0. load = 1.6610 max usecs: 1450.590, spare = 42215.410 load = 2.5081 max usecs: 1465.084, spare = 42200.918 load = 2.9317 max usecs: 1465.084, spare = 42200.918 load = 1.6190 max usecs: 133.742, spare = 43532.258 load = 0.9726 max usecs: 142.456, spare = 43523.543 load = 0.6519 max usecs: 144.597, spare = 43521.402 load = 0.4909 max usecs: 144.091, spare = 43521.910 load = 0.4293 max usecs: 160.522, spare = 43505.477 load = 0.3765 max usecs: 141.332, spare = 43524.668 load = 0.3551 max usecs: 145.723, spare = 43520.277 jackd: pcm.c:5247: snd_pcm_mmap_commit: Assertion `frames <= snd_pcm_mmap_avail(pcm)' failed. ---- Here's the asoundrc I use: ---- # create a virtual four-channel device with two soundcards: # iiuc, this is in fact two interleaved stereo streams in # different memory locations, so jack will complain that it # cannot get mmap-based access. see below. pcm.multi { type multi; slaves.a.pcm "hw:0,0"; slaves.a.channels 2; slaves.b.pcm "hw:1,0"; slaves.b.channels 2; # slaves.c.pcm "hw:2,2"; # slaves.c.channels 1; bindings.0.slave a; bindings.0.channel 0; bindings.1.slave a; bindings.1.channel 1; bindings.2.slave b; bindings.2.channel 0; bindings.3.slave b; bindings.3.channel 1; # bindings.4.slave b; # bindings.4.channel 4; # bindings.5.slave b; # bindings.5.channel 5; } ctl.multi { type hw; card 0; } # this creates a 4channel interleaved pcm stream based on # the multi device. jack will work with this one. pcm.ttable { type route; slave.pcm "multi"; ttable.0.0 1; ttable.1.1 1; ttable.2.2 1; ttable.3.3 1; } # see above. ctl.ttable { type hw; card 0; } ---- -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.boosthardware.com/LAU/guide/ ======================================== "Um...symbol_get and symbol_put... They're kindof like does anyone remember like get_symbol and put_symbol I think we used to have..." - Rusty Russell in his talk on the module subsystem