• wm4's avatar
    avformat/mp3dec: improve junk skipping heuristic · de1b1a7d
    wm4 authored
    Commit 2b3e9bbf caused problems for a
    certain API user:
    
    https://code.google.com/p/chromium/issues/detail?id=537725
    https://code.google.com/p/chromium/issues/detail?id=542032
    
    The problem seems rather arbitrary, because if there's junk, anything
    can happen. In this case, the imperfect junk skipping just caused it to
    read different junk, from what I can see.
    
    We can improve the accuracy of junk detection by a lot by checking if 2
    consecutive frames use the same configuration. While in theory it might
    be completely fine for the 1st frame to have a different format than the
    2nd frame, it's exceedingly unlikely, and I can't think of a legitimate
    use-case.
    
    This is approximately the same mpg123 does for junk skipping. The
    set of compared header bits is the same as the libavcodec mp3 parser
    uses for similar purposes.
    de1b1a7d
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