NAME
Audio::Extract::PCM - Extract PCM data from audio files
VERSION
Version 0.03_02
SYNOPSIS
This module's purpose is to extract PCM data from various audio formats. PCM is the format in which you send data to your sound card driver. This module aims to provide a single interface for PCM extraction from various audio formats, compressed and otherwise.
Currently the implementation makes use of the external "sox" program. As of 2008, sox's supported input formats include "wav", "mp3", "ogg/vorbis", "flac", if you have compiled sox with support for them, but do not include "wma" or "aac".
I have chosen the use of "sox" for the first implementation of this module because it already has an abstract interface to many formats. However I plan to include more implementations to (1) maybe include more formats, (2) make the implementation more perlish and (3) make the module more portable. CPAN has specialized modules like Audio::Mad and Ogg::Vorbis::Decoder, to which I could implement an abstract interface.
If you have suggestions how to include more implementations, or if you simply need them and want to motivate me, please contact me.
Usage example:
use Audio::PCM::Extract;
my $extractor = Audio::PCM::Extract->new('song.ogg');
my $pcm = $extractor->pcm(44100, 2, 2) or die $extractor->error;METHODS
new
Parameters: filename
Constructs a new object to access the specified file.
pcm
Parameters: frequency, samplesize, channels
Extracts PCM data.
The sample size is specified in bytes, so 2 means 16 bit sound.
Returns the pcm data as a reference to a string, or an empty list in case of an error (cf. "error").
error
Returns the last error that occured for this object.
SEE ALSO
Audio::Mad - Module to decode MPEG files, in particular MP3
Ogg::Vorbis::Decoder - Module to decode Vorbis files
http://en.wikipedia.org/wiki/Pulse-code_modulation - PCM (Pulse-code modulation)
http://sox.sourceforge.net/ - SoX homepage
AUTHOR
Christoph Bussenius, <pepe at cpan.org>
Please include the name of this module in the subject of your emails so they won't get lost in spam.
If you find this module useful, I'll be glad if you drop me a note.
COPYRIGHT & LICENSE
Copyright 2008 Christoph Bussenius, all rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.