I have been trying to use the snd-usb-audio ALSA driver to capture sound from the built-in microphone on my webcam:
yukka root # lsusb Bus 003 Device 001: ID 0000:0000 Bus 002 Device 001: ID 0000:0000 Bus 001 Device 001: ID 0000:0000 Bus 001 Device 002: ID 046d:0850 Logitech, Inc. QuickCam Web So far I have not managed to get any sound. Apart from the webcam, I also have a PCI FM801-based soundcard. This ALSA driver snd-fm801 is loaded and working. I am using a patched 2.4.20 kernel on a Gentoo Linux system. I had to use the soundcore.2.4.20.patch from the ALSA utils/patches directory to get devfs to create the device for the webcam. My ALSA setup is as follows: # cat /etc/modules.d/alsa alias char-major-116 snd alias char-major-14 soundcore alias snd-card-0 snd-fm801 alias snd-card-1 snd-usb-audio alias sound-slot-0 snd-card-0 alias sound-slot-1 snd-card-1 alias sound-service-0-0 snd-mixer-oss alias sound-service-0-1 snd-seq-oss alias sound-service-0-3 snd-pcm-oss alias sound-service-0-8 snd-seq-oss alias sound-service-0-12 snd-pcm-oss alias sound-service-1-0 snd-mixer-oss alias sound-service-1-3 snd-pcm-oss alias sound-service-1-12 snd-pcm-oss alias /dev/mixer snd-mixer-oss alias /dev/dsp snd-pcm-oss alias /dev/midi snd-seq-oss options snd snd_major=116 snd_cards_limit=2 options snd-fm801 index=0 options snd-usb-audio index=1 When I do # modprobe snd-usb-audio ... dmesg gives this output: usb.c: registered new driver snd-usb-audio USB Quickcam Class 1 SubClass 1 idVendor 46d idProduct 850 ALSA ../alsa-kernel/usb/usbaudio.c:1980: 2:2:0 : AS_GENERAL descriptor not found and I see these devices: yukka root # ll /dev/sound/ total 0 drwxr-xr-x 1 root root 0 Jan 1 1970 . drwxr-xr-x 1 root root 0 Jan 1 1970 .. crw-rw---- 1 root audio 14, 4 Jan 1 1970 audio crw-rw---- 1 root audio 14, 20 Jan 1 1970 audio1 crw------- 1 dan audio 14, 10 Jan 1 1970 dmfm crw------- 1 dan audio 14, 9 Jan 1 1970 dmmidi crw-rw---- 1 root audio 14, 3 Jan 1 1970 dsp crw-rw---- 1 root audio 14, 19 Jan 1 1970 dsp1 crw------- 1 dan audio 14, 2 Jan 1 1970 midi crw-rw---- 1 root audio 14, 0 Jan 1 1970 mixer crw-rw---- 1 root audio 14, 16 Jan 1 1970 mixer1 but if I try and use the device to record with (or use gnomemeeting), I get no sound. In fact gnomemeeting reports that it is impossible to open the device for recording. When I try to record from the device, I get an empty file: # arecord -D plughw -t wav -d 5 test.wav test.wav then contains no data. Any ideas? Dan __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com ------------------------------------------------------- This SF.NET email is sponsored by: eBay Great deals on office technology -- on eBay now! Click here: http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5 _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
