Re: 5.1 surround sound playback XRUN / snd_pcm_writei() didn't unblock immediately / small 114 msec buffer

["Clemens Ladisch" <cladisch@fastmail.net>]

Daniel Yek wrote:
> At 06:09 AM 10/6/2006, Clemens Ladisch wrote:
> >Daniel Yek wrote:
> > > I opened "surround51" PCM device and set the sampling rate to 48000, S16_LE
> > > format.
> >
> >Better use "plug:surround51".  There are chips like ICE1712 that do not
> >support any format except S32_LE.
> 
> It would be great if somebody could suggest an easy way for a media 
> application to identify if the system is 5.1-channels capable. After making 
> sure that 5.1-channels playback is preferable over 2-channels playback, I 
> can then use "plug:surround51" PCM device. I assume that Plug will convert 
> all 6 channels without dropping any here. If not, it is not usable.
> 
> Right now, I'm depending on opening "surround51" PCM device to fail to 
> indicate that the system isn't 5.1-channels capable. "plug:surround51" PCM 
> wouldn't open-fail even if the system isn't 5.1-channels capable, resulting 
> in a poor playback experience. Do you have a suggestion for me?

The configuration files won't define a "surround51" device if the
hardware is not capable of accepting 5.1 sound, so opening
"plug:surround51" should fail as expected.


HTH
Clemens

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