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POCalculate checksum of audio files without considering the header
 

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  1. POCalculate checksum of audio files without considering the header
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    <p>I want to programmatically create a SHA1 checksum of audio files (MP3, Ogg Vorbis, Flac). The requirement is that the checksum should be stable <strong>even if the header (eg. ID3) changes</strong>.<br/> <em>Note: The audio files don't have CRCs</em></p> <p>This is what I tried by now:</p> <h3>1) Reading + Hashing all MPEG frames using Perl and <a href="http://search.cpan.org/dist/MPEG::Audio::Frame/" rel="nofollow noreferrer">MPEG::Audio::Frame</a></h3> <pre><code>my $sha1 = Digest::SHA1-&gt;new; while (my $frame = MPEG::Audio::Frame-&gt;read(\*FH)) { $sha1-&gt;add($frame-&gt;content()); } </code></pre> <h3>2) Decoding + Hashing all MPEG frames using Python and <a href="http://spacepants.org/src/pymad/" rel="nofollow noreferrer">libmad (pymad)</a></h3> <pre><code>mf = mad.MadFile(path) sha1 = hashlib.sha1() while 1: buf = mf.read() if (buf is None): break sha1.update(buf) </code></pre> <h3>3) Using <a href="http://tomclegg.net/mp3cat" rel="nofollow noreferrer">mp3cat</a></h3> <pre><code>&gt; mp3cat - - &lt; file.mp3 | sha1sum </code></pre> <p>However, none of those methods provided a <strong>stable</strong> checksum. Namely, in <em>some</em> cases the checksum changed after retagging the file with <a href="http://musicbrainz.org/doc/PicardTagger" rel="nofollow noreferrer">picard</a>.</p> <p>Are there any libraries that already provide what I want?<br/> I don't care about the programming language… </p> <p><b>Update:</b> I debugged the case a bit further. The libmad checksum inconsitency seems to happen in cases where libmad gets some decoding errors, like <em>"Huffman data overrun (0x0238)"</em>. As this really happens on many of the mp3 files I'm not sure if it really indicates a broken file…</p>
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