John Sigler wrote: > Jaroslav Kysela wrote: > >> John Sigler wrote: >> >>> I have an RME AES-32 PCI board which provides 4 stereo input channels >>> and 4 stereo output channels. >>> >>> (I'm using the hsdpm driver at this time.) >>> >>> I want to use one process per channel, i.e. process A handles stereo >>> input #1 (on the XLR connector #1), process B handles stereo input >>> #2, etc. >>> >>> The processes are independent, in that process A might be started, >>> and only several hours later, process B is started, then a few hours >>> later process A is killed and restarted. >>> >>> Is it possible to do that with the ALSA library? >> >> Yes, look for the dsnoop plugin configuration in alsa-lib. > > I see references to "ipc" in alsa.conf. > > My embedded kernel is compiled with > # CONFIG_SYSVIPC is not set > > Does the dsnoop plug-in require kernel support? # ./arecord -D dsnoop -vv -M -r 48000 -f S32_LE -t raw -d 60 /tmp/out ALSA lib pcm_direct.c:1605:(snd1_pcm_direct_parse_open_conf) The field ipc_gid must be a valid group (create group audio) arecord: main:564: audio open error: Invalid argument OK. I need to create the 'audio' group. # ./arecord -D dsnoop -vv -M -r 48000 -f S32_LE -t raw -d 60 /tmp/out ALSA lib pcm_dsnoop.c:540:(snd_pcm_dsnoop_open) unable to create IPC semaphore arecord: main:564: audio open error: Function not implemented No cookie... I suppose I have to recompile a kernel? ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
