From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Line-In
From: anothy@cosym.net
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Message-Id: <20020226152718.CFE7C19980@mail.cse.psu.edu>
Date: Tue, 26 Feb 2002 10:27:09 -0500
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from audio(3):
	Audio data is a sequence of stereo samples, left sample first.
	Each sample is a 16 bit little-endian two's complement
	integer; the default sampling rate is 44.1 kHz.
i'm not familiar with the term "cdr" as an audio format, but i'm
guessing you're refering to the audio format on a CD. that's PCM,
and yes, it's the same format you read/write on /dev/audio.

// I've tried using lame to convert P9 /dev/audio data to mp3...

one step at a time. can you get data from /dev/audio to start
with? just try 'cat /dev/audio > /tmp/foo', yell into the mic some,
and then kill the cat. the contents of /tmp/foo should be PCM
audio, suitable for 'cat /tmp/foo > /dev/audio'.

assuming you're getting audio data, are you sure lame is working?
i had issues with it producing valid but garbage mp3 files. for my
experiences, take a look at http://9srv.net/mpeg/ - the summary
is that i use BladeEnc quite succesfully. the single line to compile
it, and a binary in case you have problems, are available there.
ア