Mp3 audio frame length calculated incorrectly?

[Vitali Lovich]

It seems as if the mp3 frame length is calculated incorrectly (off by about
a factor of two).  All the equations I've seen online (and I've verified
that they work on the files I'm testing) use:

144000 * bitrate / sampleRate + ispadded

whereas TagLib::MPEG::Header uses

72000 * bitrate / sampleRate + ispadded

Am I missing something, or is this incorrect?  If it's a mono/stereo issue,
shouldn't the header account for this or is the user supposed to multiply by
2 & subtract 1 if it's padded?

Thanks,
Vitali
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