Date: Thu, 14 Jan 2010 18:41:56 -0800 From: Gary Kline <kline@thought.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-questions@freebsd.org Subject: Re: any port use /dev/dsp directly? Message-ID: <20100115024156.GA28725@thought.org> In-Reply-To: <20100115001351.GA27272@thought.org> References: <20100114012059.GA3921@thought.org> <20100114013746.GB67999@orion.hsd1.pa.comcast.net> <20100114024242.GA9744@thought.org> <20100114165717.GA5651@dan.emsphone.com> <20100114201616.GA73961@thought.org> <20100114211947.GB5651@dan.emsphone.com> <20100114223105.GA84284@thought.org> <20100114230825.GD5651@dan.emsphone.com> <20100115001351.GA27272@thought.org>
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On Thu, Jan 14, 2010 at 04:13:51PM -0800, Gary Kline wrote:
> On Thu, Jan 14, 2010 at 05:08:25PM -0600, Dan Nelson wrote:
> > In the last episode (Jan 14), Gary Kline said:
> > > On Thu, Jan 14, 2010 at 03:19:47PM -0600, Dan Nelson wrote:
> > > > The sox port comes with its own "play" command that can parse many
> > > > containers and encodings, including wav files.
> > >
> > > I did see that. I'm wondering of theses is some sox translation that
> > > would do say
> > >
> > > %sox -w WAV -r [rawoutfile]
> >
> > Certainly; file conversion is one of the basic purposes of sox. Something
> > like:
> >
> > sox myfile.wav -b 16 -e signed -r 22050 -c 2 myfile.raw
> >
> > will convert the wav file (whatever its format is) to a signed 16-bit stereo
> > raw file. For raw files, you can also use special file extensions that
> > specify the encoding ("myfile.s16" for example, for a signed 16-bit file).
> > Adding "-V3" to the beginning of the command will print the full input and
> > output specs, plus the filter chain required to do the conversion (if any).
> > The sox and soxformat manpages are pretty comprehensive.
Well, what I mentioned earlier about the similarities of the pcaudio.c
code and my test code gave me the clue: In the read() and write(), the
number of bytes read in before the read failed was the right number,
len, to be written. In my test code I reused my code from 1996. Then
my "sizeof buf" was valid because it was a simple sine wave. This time
I was using a different array.
....
gary
> >
--
Gary Kline kline@thought.org http://www.thought.org Public Service Unix
http://jottings.thought.org http://transfinite.thought.org
The 7.79a release of Jottings: http://jottings.thought.org/index.php
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