NAME Audio::Ofa - Perl interface to libofa, an Acoustig Fingerprinting library SYNOPSIS This module provides a direct interface to libofa. For not-so-lowlevel and more practical assistance with audio fingerprints see Audio::Ofa::Util. use Audio::Ofa qw(ofa_get_version ofa_create_print) SUBROUTINES ofa_get_version Retrieves the version of the installed libofa. Returns a string like 0.9.3. ofa_create_print(data, byteOrder, size, sRate, stereo) From the libofa source code comments: data: a buffer of 16-bit samples in interleaved format (if stereo), i.e. L,R,L,R, etc. This buffer is destroyed during processing. Ideally, this buffer should contain the entire song to be analyzed, but the process will only need the first 2min + 10sec + any silence prepending the actual audio. Since the precise silence interval will only be known after a couple of processing steps, the caller must make adequate allowance for this. Caveat emptor. byteOrder: OFA_LITTLE_ENDIAN, or OFA_BIG_ENDIAN - indicates the byte order of the data being passed in. size: the size of the buffer, in number of samples. sRate: the sample rate of the signal. This can be an arbitrary rate, as long as it can be expressed as an integer (in samples per second). If this is different from 44100, rate conversion will be performed during preprocessing, which will add significantly to the overhead. stereo: 1 if there are left and right channels stored, 0 if the data is mono On success, a valid text representation of the fingerprint is returned. One should note that "size" is the byte length of "data" divided by 2 (as in 2 bytes as in 16 bit), regardless of "stereo". The XS code will throw an exception if "size" is too large, to prevent a buffer overread. CONSTANTS OFA_LITTLE_ENDIAN OFA_BIG_ENDIAN SEE ALSO Audio::Ofa::Util provides utilities to read audio files and to look up audio fingerprints at MusicDNS. - The Wikipedia article about acoustic fingerprints. LICENSE This module is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License (GPL) as published by the Free Software Foundation (http://www.fsf.org/); either version 2 of the License, or (at your option) any later version.