Re: struct snd_pcm_hardware_t values

[Ben Dooks <ben@trinity.fluff.org>]

On Sun, Aug 06, 2006 at 08:38:53PM +0200, Markus Rechberger wrote:
> I did some more investigation uppon this
> >     .buffer_bytes_max = (32*1024),
> this one seems to be clear now, I set it to the max
> transfer_buffer_size of 1 URB
> >     .period_bytes_min = 64,
> this one not .. in my case I set it to transfer_buffer_size/2
> >     .period_bytes_max = 2048,
> this one is again transfer_buffer
> >     .periods_min = 1,
> I set this one to 2 (people in IRC cleared me up about this one)
> >     .periods_max = 255,
> no idea again..
> 
> So what I get now is:
> http://lost-souls.mercuryserver.de/files/data/test.wav.mp3
> 
> and a buffer underrun regarding aplay
> aplay -D hw:2,1 5_5_2006__07_00_59.wav
> Playing WAVE '5_5_2006__07_00_59.wav' : Signed 16 bit Little Endian,
> Rate 9600 Hz, Mono
> underrun!!! (at least 0,307 ms long)
> underrun!!! (at least 0,285 ms long)
> underrun!!! (at least 0,295 ms long)
> underrun!!! (at least 0,279 ms long)
> underrun!!! (at least 0,298 ms long)
> underrun!!! (at least 0,287 ms long)
> 
> the strange thing here is the DTMF tones in the background sound fine,
> so I don't really recognize an underrun when playing the file just
> that strange noise which is constant all the time..
> 
> following is what my debug prints in dmesg:
> I'm sure the PCM PLAYBACK TRIGGER STOP! are caused by the buffer
> underrun which is reported by aplay..
> The outgoing dataformat is 9600hz, S16_LE, mono ..

I'm having trouble with ALSA intermittently getting into a state
where the trigger is being repeatedly called for start then stop
and can only sometimes get out of it. I will post a seperate report
on this later.

-- 
Ben

Q:      What's a light-year?
A:      One-third less calories than a regular year.


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