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avcodec/bitstream: Consistently treat symbol as VLC_TYPE

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If a static VLC table gets initialized a second time (or concurrently by
two threads) and if said VLC table uses symbols that have the sign bit
of VLC_TYPE (a typedef for int16_t) set, initializing the VLC fails. The
reason is that the type of the symbol in the temporary array is an
uint16_t and so comparing it to the symbol read from the VLC table will
fail, because only the lower 16bits coincide. Said failure triggers an
assert.

Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit df6ec7f83b)
This commit is contained in:
Andreas Rheinhardt 2020-10-26 00:05:26 +01:00
parent da5ac1563e
commit 943ce3a756
1 changed files with 1 additions and 1 deletions
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libavcodec/bitstream.c
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@ -129,7 +129,7 @@ static int alloc_table(VLC *vlc, int size, int use_static)
typedef struct VLCcode {
uint8_t bits;
uint16_t symbol;
VLC_TYPE symbol;
/** codeword, with the first bit-to-be-read in the msb
* (even if intended for a little-endian bitstream reader) */
uint32_t code;