On 04/12/16 21:51, James Shatto wrote: > It can record from all 4. You can mix all 4 inputs down into one stream and then record that, but do you really mean that you can record to 4 separate application threads concurrently without mixing? > I suspect that adding -c 4 would overcome the issue. The -f dat has a > default of -f S16_LE -c 2 -r 48000. So you might want to change that > parameter as well. Terminal 1 ... $ arecord -DD44_ch12_capture -f S24_LE -c 4 -r 96000 test12.wav Recording WAVE 'test12.wav' : Signed 24 bit Little Endian, Rate 96000 Hz, Channels 4 Terminal 2 ... $ arecord -DD44_ch34_capture -f S24_LE -c 4 -r 96000 test34.wav arecord: main:722: audio open error: Device or resource busy Terminal 1 ... ^C Terminal 2 ... $ arecord -DD44_ch34_capture -f S24_LE -c 4 -r 96000 test34.wav Recording WAVE 'test34.wav' : Signed 24 bit Little Endian, Rate 96000 Hz, Channels 4 Terminal 1 ... $ arecord -DD44_ch12_capture -f S24_LE -c 4 -r 96000 test12.wav arecord: main:722: audio open error: Device or resource busy i.e. the same behaviour as before. It appears that one thread is blocking the other. > I have that card, although I haven't booted that old PCI system in a > while. Please try it and see if you can get it to work with multiple concurrent input streams. > It's a nice card, a shame > most newer things don't have PCI in favor of PCIe. This core2duo machine has a gigabyte motherboard with a single PCI slot. The application also has two by two channel separate outputs. It is easy to separate those to Channel 1 & 2 and Channel 3 & 4 in .asoundrc using the dshare plugin. I have tried to separate the two by two channel separate inputs using two instanced of dsnoop, but it does not work. You get the same blocking problem that is exhibited by arecord. > Assuming that it didn't get index 0 in /proc/asound/cards. The Delta 44 is at index 0. zcx ------------------------------------------------------------------------------ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
