Takashi Iwai wrote: > At Tue, 10 Sep 2002 10:58:34 +0200 (METDST), > Clemens Ladisch wrote: > >>>>The two PCM devices cannot be used at the same time anyway, so I think >>>>creating a quirk for interface 0 which says "ignore this" could work. >>>>Takashi, any comments? >>> >>>i think implementing a semaphore (or flag) for each endpoint would be >>>better, so that the driver can find generally double-endpoints >>>problem. >> >>I cannot imagine anybody else would be stupid enough to design a device >>with double endpoints. But then I didn't imagine Midiman would, either. >>Oh well, Murphy's Law ... :-( > > > since many (at least plural :) devices have this problem, i changed > the usbaudio code slightly. now a pcm stream is created per endpoint > instead of interface. > > on this version, m-audio's device should have one (for duo) or two > (for quattro) pcm devices. > > please let me know if any problems arise with this change. >
FYI: I have found that using the quattro with jack is rock solid when only accessing one of the pcms at a time at 48khz even as normal user. But switch to a higher sample rate and/or 4 channels(with root priveledges and lowlatency scheduling on) and different things happen: ---- jackd -v -d alsa -d quattro1 -r 96000 -p 192 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 10691 waiting for signals creating alsa driver ... quattro1|192|2|96000|swmon ALSA lib pcm_hw.c:398:(snd_pcm_hw_prepare) SNDRV_PCM_IOCTL_PREPARE failed: Invalid argument ALSA: cannot set hardware parameters for capture ALSA: cannot configure capture channel cannot load driver module alsa jack main caught signal 15 ---- jackd -v -d alsa -d q4b -r 48000 -p 3072 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 10728 waiting for signals creating alsa driver ... q4b|3072|2|48000|swmon new client: alsa_pcm, id = 1 type 1 @ 0x8068078 fd = 14 port alsa_pcm:in_1 buf shm key 0x53ff306d at offset 12288 bi = 0x8067448 registered port alsa_pcm:in_1, offset = 12288 port alsa_pcm:in_2 buf shm key 0x53ff306d at offset 24576 bi = 0x8067458 registered port alsa_pcm:in_2, offset = 24576 port alsa_pcm:in_3 buf shm key 0x53ff306d at offset 36864 bi = 0x8067468 registered port alsa_pcm:in_3, offset = 36864 port alsa_pcm:in_4 buf shm key 0x53ff306d at offset 49152 bi = 0x8067478 registered port alsa_pcm:in_4, offset = 49152 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. **** alsa_pcm: xrun of at least 0.046 msecs **** alsa_pcm: xrun of at least 0.045 msecs load = 11.1325 max usecs: 14249.315, spare = 49749.684 **** alsa_pcm: xrun of at least 0.044 msecs load = 16.6987 max usecs: 14249.315, spare = 49749.684 **** alsa_pcm: xrun of at least 0.043 msecs load = 19.4754 max usecs: 14241.095, spare = 49757.906 load = 20.8637 max usecs: 14241.095, spare = 49757.906 load = 10.5940 max usecs: 207.489, spare = 63791.512 **** alsa_pcm: xrun of at least 0.045 msecs load = 16.4347 max usecs: 14256.115, spare = 49742.883 load = 19.3551 max usecs: 14256.115, spare = 49742.883 load = 9.8830 max usecs: 262.911, spare = 63736.090 **** alsa_pcm: xrun of at least 0.043 msecs load = 16.0698 max usecs: 14243.989, spare = 49755.012 jackd: signal 2 received jack main caught signal 15 # jackd -v -d alsa -d q4b -r 48000 -p 6144 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 10734 waiting for signals creating alsa driver ... q4b|6144|2|48000|swmon new client: alsa_pcm, id = 1 type 1 @ 0x8068078 fd = 14 port alsa_pcm:in_1 buf shm key 0x74529998 at offset 24576 bi = 0x8067448 registered port alsa_pcm:in_1, offset = 24576 port alsa_pcm:in_2 buf shm key 0x74529998 at offset 49152 bi = 0x8067458 registered port alsa_pcm:in_2, offset = 49152 port alsa_pcm:in_3 buf shm key 0x74529998 at offset 73728 bi = 0x8067468 registered port alsa_pcm:in_3, offset = 73728 port alsa_pcm:in_4 buf shm key 0x74529998 at offset 98304 bi = 0x8067478 registered port alsa_pcm:in_4, offset = 98304 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. **** alsa_pcm: xrun of at least 1.435 msecs **** alsa_pcm: xrun of at least 0.046 msecs load = 5.2546 max usecs: 13451.668, spare = 114547.328 **** alsa_pcm: xrun of at least 0.043 msecs load = 8.6591 max usecs: 15441.339, spare = 112557.664 **** alsa_pcm: xrun of at least 0.042 msecs load = 10.3614 max usecs: 15441.339, spare = 112557.664 **** alsa_pcm: xrun of at least 0.045 msecs load = 11.2125 max usecs: 15441.339, spare = 112557.664 **** alsa_pcm: xrun of at least 0.046 msecs load = 11.6381 max usecs: 15441.339, spare = 112557.664 jackd: signal 2 received jack main caught signal 15 -- 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 ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
