Date: Fri, 15 Jan 2010 11:12:17 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Gary Kline <kline@thought.org> Cc: Glen Barber <glen.j.barber@gmail.com>, freebsd-questions@freebsd.org Subject: Re: any port use /dev/dsp directly? Message-ID: <20100115171217.GE5651@dan.emsphone.com> 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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In the last episode (Jan 14), Gary Kline said:
> 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.
> >
>
> yes, the man page is thorough, but almost unreadable, at least to me. i
> found a tutorial with exaples that should the WAV to RAW conversion. on
> my freebsd desktop, sox didn't like it. it kept echoing the usage.
That is a bit annoying, yes, but right before the usage test, it should have
printed an error message saying what it didn't like about your commandline.
> on my ubuntu system, sox failed completely complaining that that it wasn't
> set for "auto" ..... [?] I checked again here to see if sox as play would
> work, and it does. so at least that much works.
>
> the error output escapes me. doesn't the ``-r 22050'' specify the
> sampling rate?
Yes, but that was during the wav->raw conversion. The sample rate wasn't
stored in the raw file, because raw files are just that: raw audio data,
with no headers indicating sampling rate for encoding format. For the play
command to be able to handle a raw file, it needs to be told the rate and
format when it's run.
> play FAIL formats: bad input format for file `myfile.raw': sampling rate was not specified
--
Dan Nelson
dnelson@allantgroup.com
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