From a367e435d816dfe6939ab9932e87c089fb1f3f73 Mon Sep 17 00:00:00 2001 From: Andreas Rheinhardt Date: Fri, 17 Jun 2022 01:54:22 +0200 Subject: [PATCH] avcodec/av1: Add upper bound for the size of a sane sequence header 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 --- libavcodec/av1.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libavcodec/av1.h b/libavcodec/av1.h index 951a18ecb2..384f7cddc7 100644 --- a/libavcodec/av1.h +++ b/libavcodec/av1.h @@ -175,4 +175,10 @@ enum { 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 */