Re: Mysteries of sound in Fedora-9

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On Sun, 25 May 2008 16:36:03 +0100, Timothy Murphy wrote:

> Tim wrote:
> 
> >> Someone mentioned trying something like "cat foo.ogg > /dev/dsp".
> >> In my case, when sound is working this produces a white noise.
> >> Is this testing the sound driver
> >> (in my case snd_intel8x0 , I assume) directly?
> > 
> > If you catted a raw audio format, rather than a compressed one, to the
> > sound device, you ought to hear sound.  Hearing garbage isn't really
> > going to prove much.
> 
> Thanks for your interest and perseverance.
> 
> I gather that .wav is an uncompressed format (according to
> <http://www.webopedia.com/DidYouKnow/Computer_Science/2005/digital_audio_formats.asp>),
> but I just hear white noise if I cat this,

"Uncompressed" does not imply "not encoded". Even WAV may contain non-PCM
encoded data, such as Microsoft ADPCM. It's very unlikely to get more
than noise when copying unknown data to a device file like /dev/dsp, which
expects raw data in another format.

-- 
Fedora release 8 (Werewolf) - Linux 2.6.23.15-137.fc8
loadavg: 1.19 1.13 1.32

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