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avcodec/av1: Add upper bound for the size of a sane sequence header

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It will be used by the Matroska muxer to reserve a certain number
of bytes for the CodecPrivate in case no extradata is initially
available (as it is for the libaom-av1 encoder).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-06-17 01:54:22 +02:00
parent 67eea6cf02
commit a367e435d8
1 changed files with 6 additions and 0 deletions
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6
libavcodec/av1.h
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@ -175,4 +175,10 @@ enum {
AV1_RESTORE_SWITCHABLE = 3, AV1_RESTORE_SWITCHABLE = 3,
}; };
// Sequence Headers are actually unbounded because one can use
// an arbitrary number of leading zeroes when encoding via uvlc.
// The following estimate is based around using the lowest number
// of bits for uvlc encoding.
#define AV1_SANE_SEQUENCE_HEADER_MAX_BITS 3138
#endif /* AVCODEC_AV1_H */ #endif /* AVCODEC_AV1_H */