Re: Single process freeze when opening capture device

[Abramo Bagnara <abramo.bagnara@libero.it>]

Jaroslav Kysela ha scritto:
> On Wed, 28 May 2003, Arthur Peters wrote:
> 
> 
>>I have found what seems to be a bug in ALSA (CVS of this afternoon).
>>When a program opens certain PCM devices for capture the program blocks
>>forever in snd_pcm_open (both the library function and the kernel
>>function actually). The PCM device I have been testing it with is
>>surround40 on a emu10k1 (SBLive Value). I am trying to capture on this
>>device because I want to have jack use surround40 (actually a route
>>plugin device pointing to it) so that I can use all 4 outs and both ins
>>at the same time.
>>
>>Below is a minimal setup that reproduces the problem for me.
>>
>>alsa_freeze.c
>>------------------
>>#include <alsa/asoundlib.h>
>> 
>>int main( int argc, char* argv[] )
>>{
>>        snd_pcm_t *pcm;
>>        snd_pcm_open(&pcm, "surround40", SND_PCM_STREAM_CAPTURE, 0);
>>        return 0;
>>}
> 
> 
> It is limit of current alsa-lib configuration. We cannot distinct playback
> and capture. But I am not sure, if returning an error helps you
> (surround40 configuration is NOT valid for emu10k1). I suggest to fix jack
> to allow different names for playback and capture with different count of
> channels.
> 

What about a "dir" field in common section of pcm configuration?

   dir STR	# PCM allowed directions "playback", "capture", "both" (default)

-- 
Abramo Bagnara                       mailto:abramo.bagnara@libero.it

Opera Unica                          Phone: +39.546.656023
Via Emilia Interna, 140
48014 Castel Bolognese (RA) - Italy



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