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avformat/internal: Document the freeing behavior of ff_alloc_extradata()
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -580,6 +580,8 @@ static inline int ff_rename(const char *oldpath, const char *newpath, void *logc
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* Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
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* which is always set to 0.
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*
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* Previously allocated extradata in par will be freed.
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*
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* @param size size of extradata
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* @return 0 if OK, AVERROR_xxx on error
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*/
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