Date: Fri, 15 Jan 2010 12:38:19 -0800 From: Gary Kline <kline@thought.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: Glen Barber <glen.j.barber@gmail.com>, freebsd-questions@freebsd.org Subject: Re: any port use /dev/dsp directly? Message-ID: <20100115203819.GB95648@thought.org> In-Reply-To: <20100115171217.GE5651@dan.emsphone.com> 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> <20100115171217.GE5651@dan.emsphone.com>
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On Fri, Jan 15, 2010 at 11:12:17AM -0600, Dan Nelson wrote: > In the last episode (Jan 14), Gary Kline said: > > On Thu, Jan 14, 2010 at 05:08:25PM -0600, Dan Nelson wrote: [[ ... ]] > > > > > > 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 > Hm. Well, once I'm further along in this stuff I'll ask your help again. I made more changes, happily advancing my project, just before I threw in the towel and went to watch the news. Spiders were gluing me to the desk with their webs. One immediate thought is that the -r 22050 may have been way too large since the WAV file is 8000Hz and mono. It is small as-is, but it wouldn't hurt to have it shrung by stripping off the header. just a thought. > -- > Dan Nelson > dnelson@allantgroup.com > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" -- 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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