Re: Tips on debugging ALSA driver snd_es18xx

[Paulo Marcel Coelho Aragao <pmcaragao-ag@yahoo.com>]

Takashi Iwai wrote on Dec, 15:

[...]

> > > > I recently switched from OSS to ALSA and I'm baffled by this: aplay 
> > > > produces
> > > > sound when playing wav files, but gxine and xmms produce no sound when
> > > > playing streaming audio.

> > > What are the contents of /proc/asound/card0/pcm0p/sub0/hw_params and sw_params
> > > in either case?

[...]

> > This was curious: the wav files I tried with aplay ended too quickly, so I 
> > looked for longer ones. My surprise: no sound from the longer ones. It gave me 
> > the impression to be related to the sound source being coded for 16 or 
> > 8-bits, if I'm not speaking just plain nonsense.

[...]

> Might it be depending on the sample rate?
> Try speaker-test, for example, with different sample rates.

Tried all rates from the aplay/gxine/xmms runs, and also lower and higher 
rates but no sound at all, not even with 11127Hz, the rate of the aplay run 
that produced sound.

I did notice this line in all speaker-test runs:

Stream parameters are 11127Hz, S16_LE, 1 channels

of course with a differen rate at each run. S16_LE is the format for all 
aplay/gxine/xmms runs that didn't produce sound. I don't know precisely what 
`format' is, but the aplay run that produced sound had a different value: U8.

[...]

> > PS: Would have at hand a reference to some document that describes 
> > /proc/asound ?

> alsa-kernel/Documentation/Procfile.txt (in kernel tree
> linux/Documentation/sounds/alsa/Procfile.txt).

Thanks for this, and more so, thanks for taking your time with such 
speed-lightning reply.
Paulo


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