[FFmpeg-devel] [PATCH] Per-frame metadata

[Nicolas George]

Hi. After the recent move of the metadata API to libavutil, I rebased and
reworked my proposal for per-frame metadata decoding:

1/5: Introduce av_size_mult and av_realloc_f

This is very similar to the original proposal. The chunk with av_size_mult
was ok-ed, but was later changed to return an AVERROR code rather than -1.

I also learned in the meantime that BSD has a reallocf function, which is
similar to the proposed av_realloc_f: it frees the memory if it fails, but
it does not check for integer overflow.

2/5: Replace av_realloc by av_realloc_f when relevant

Unchanged except for merge conflicts.

3/5: Introduce a metadata field in AVFrame

It also introduces CODEC_FLAG2_FRAME_METADATA: per-frame metadata is only
decoded if this flag is set. This avoids memory leaks if release_buffer does
not free the metadata.

4/5: PNG: decode textual data (tEXt and zTXt chunks)

Almost identical to the original proposal.

5/5: ffmpeg: dump per-frame metadata

For testing purposes; I am not sure if we want it or not.

Regards,

-- 
  Nicolas George
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