[alsa-devel] ALSA : Can't open capture device

[Clemens Ladisch]

Alexandre BOUIN wrote:
> I'm working on an intern project, using an AT91SAM9260EK-based board,
> embedded system.
> Our kernel contains a full ALSA 1.14 with ASoC layer.
> Our ASoC driver works well in capture and playback, if we are using OSS
> layer or directly /dev/dsp.
> So I need some tips on ALSA layer side :
> 
> here you can see that my device is created : 
> ll /dev/snd/
> crwxrwxrwx    1 root     root     116,   0 Dec 26  2007 controlC0
> crwxrwxrwx    1 root     root     116,   4 Dec 26  2007 hwC0D0
> crwxrwxrwx    1 root     root     116,  14 Dec 26  2007 pcmC0D0c
> crwxrwxrwx    1 root     root     116,  16 Dec 26  2007 pcmC0D0p
> ll /dev/dsp
> crwxrwxrwx    1 root     root      14,   3 Dec 26  2007 /dev/dsp
> 
> A cat on playback device works (I added some traces in kernel) : 
> cat < /dev/snd/pcmC0D0p
> snd_pcm_open : enter
> snd_pcm_open_file : before snd_pcm_open_substream
> snd_pcm_open_file : after snd_pcm_open_substream
> cat: read error: Invalid argument
> 
> But a cat on capture device does not work : 
> cat < /dev/snd/pcmC0D0c
> -sh: cannot open /dev/snd/pcmC0D0c: No such device

Does the capture device appear in /proc/asound/devices or in the output
of "arecord -l"?


Regards,
Clemens