Re: [OT] ALSA userspace API complexity

[Jaroslav Kysela <perex@suse.cz>]

On Thu, 5 Jan 2006, Heikki Orsila wrote:

> > > 	err = alsa_simple_pcm_open(nchannels, sampleformat, samplingrate, frames_in_period /* 0 for automated default */ );
> > > 	err = alsa_simple_writei(); /* handless signal brokeness automagically */
> > > 	alsa_simple_close();
> > 
> > Well, it's better to create only "fast parameter setup" and "default error 
> > recovery" functions.
> 
> As long as all applications PCM code can be written into 10-20 C lines. 
> That includes: opening device, writing pcm data and closing the device. 

I've added snd_pcm_set_params() and snd_pcm_recover() functions into 
alsa-lib (they're a bit experimental and I'm still waiting for any 
feedback from others).

The "minimal example" can be reached at:

http://cvs.sourceforge.net/viewcvs.py/alsa/alsa-lib/test/pcm_min.c?rev=1.2&view=markup

> > > Basically ogg123/mpg123 like applications would only need 3 alsa calls. 
> > > Now everyone reimplementing their own buggy versions of simple mechanisms.
> > 
> > While "official" examples exists for a long time.
> 
> btw. your official examples don't work on simple PCM playback didn't 
> work when I last time tried. Sorry, I can't remember details because it 
> is so long ago.

Any bug report? We don't have a crystal ball to fix bugs without any 
information.

						Jaroslav

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Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs