[alsa-devel] Recording problem with ALSA: trying to set up some constraints
sedji.gaouaou at atmel.com
Fri May 23 16:27:19 CEST 2008
Clemens Ladisch a écrit :
> Sedji Gaouaou wrote:
>> I have a problem with my recording driver.
>> I have set up a pcm_hardware structure in which I define the format
>> supported by my hardware:
>> .formats = (SNDRV_PCM_FMTBIT_S16_LE
>> | SNDRV_PCM_FMTBIT_S16_BE
>> | SNDRV_PCM_FMTBIT_S20_3LE
>> Then in my open function I pass it to the runtime struct.
>> Nevertheless if I try to run arecord with this option: arecord -d 1
>> test.wav, I will have a kernel oops.
>> The default format is U8, but it is not supported by my Hardware, abd it
>> is not defined in my structure, so I though that it should exit arecord
>> but not crash.
> The default device will do automatic sample format conversion, i.e.,
> your driver will see a request for S16_LE.
> This looks like a bug somewhere else in your driver.
That means that if the format is no supported, it should not return an
error, but just use another format which is supported?
More information about the Alsa-devel