[FFmpeg-devel] [PATCH] id3v2: fix unsynchronization

[Michael Niedermayer]

On Tue, Jan 30, 2018 at 01:43:25PM +0100, wm4 wrote:
> The ID3v2 "unsynchronization scheme" requires replacing any 0xFF 0x00
> sequences with 0xFF. This has to be done on every byte of the source
> data, while the current code skipped a byte after a replacement. This
> meant 0xFF 0x00 0xFF 00 was translated to 0xFF 0xFF 0x00 instead of 0xFF
> 0xFF. It feels a bit messy to do this correctly with the avio use. But
> fortunately, this translation can be done in-place, so we can just do it
> in memory.
> 
> Inspired by what taglib does.
> ---
> Sample (which had corrupted cover art, displays fine with the fix):
> https://0x0.st/sbQ9.bin (unfortunately a bit too large for FATE)
> ---
>  libavformat/id3v2.c | 26 ++++++++++++++------------
>  1 file changed, 14 insertions(+), 12 deletions(-)

if this works better than before then its a good idea.
Also your code looks better and more efficient than what was there
before

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The bravest are surely those who have the clearest vision
of what is before them, glory and danger alike, and yet
notwithstanding go out to meet it. -- Thucydides
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