Re: [Alsa-devel] Re: file.wav -> dsp issue

[Takashi Iwai <tiwai@suse.de>]

At Tue, 30 Nov 2004 16:02:48 -0500,
Lee Revell wrote:
> 
> On Tue, 2004-11-30 at 15:05 -0500, Haines Brown wrote:
> > > On Tue, 2004-11-30 at 13:04 -0500, Haines Brown wrote:
> > > >      # cat file.wav > /dev/dsp
> > > > 
> > > > it seems to play at half speed (pitch is very low, playing speed very
> > > > slow).  
> > > > 
> > > > Is the command above the best way to do a simple test of sound? Why
> > > > should sending the file to dsp not play correctly?
> > > 
> > > No, that is the way to do it with the deprecated OSS API.  It seems like
> > > a convenient, Unixy way to play sounds but there are many problems with
> > > it.
> > > 
> > > The ALSA way is "aplay file.wav".  Does this work?
> > 
> > Yes, that worked fine. I find that it plays WAV and VOC, but not MID
> > and WMA files (just screeches). Thanks.
> 
> Hmm, my point about the OSS api notwithstanding, seems like cat foo.wav
> > /dev/dsp should work, if aplay groks the format.  It seems to be
> getting the sample rate wrong.  I am cc'ing alsa-devel.

"cat > /dev/dsp" itself doesn't parse the format but just handles as
if a raw PCM data.  It is pretty casual that it worked somehow.


Takashi


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