Re: hdsp vs 16bit vs dmix

[Thomas Charbonnel <thomas@undata.org>]

Takashi Iwai wrote :
>>
>>------
>>  aplay -f cd -D default audio.wav
>>ALSA lib pcm_hw.c:324:(snd_pcm_hw_hw_params) SNDRV_PCM_IOCTL_HW_PARAMS 
>>failed: Device or resource busy
>>ALSA lib pcm_direct.c:712:(snd_pcm_direct_initialize_slave) unable to 
>>install hw params
>>ALSA lib pcm_dmix.c:827:(snd_pcm_dmix_open) unable to initialize slave
>>aplay: main:502: audio open error: Device or resource busy
> 
> 
> hmm, it's wierd.  -ENODEV ?
> 

Old thread, but I missed it then. Indeed the dmix plugin doesn't play 
nicely with the hdsp.
The above give -ENODEV because if you don't specify 'channels 18' (for a 
multiface) in the dmix slave definition, the way the hw param settings 
is done tries to switch the card to double speed mode (there are less 
channels then, I guess it's closer to the 2 channels requested).
You should have the following in your logs :
cannot change speed mode (capture PID = -1, playback PID = 3888)

Now if you do specify 'channels 18' in the dmix slave definition, the 
error is as follows :
aplay: set_params:827: Sample format non available
I have 'format S32_LE' set in the dmix slave definition, but it doesn't 
seem to be taken into account.

Thomas




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