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avcodec/mdec: Optimize processing escape codes

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Said escape code is only six bits long, so that one has at least 25 - 6
bits in the bitstream reader's cache after reading it; therefore the
whole following 16 bits (containing the actual code) are already in the
bitstream reader's cache, making it unnecessary to reload the cache.

This is the mdec analogue of fe9bc1cc45.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-03-07 03:57:30 +01:00
parent de562e8069
commit 9aeb6940a2
1 changed files with 2 additions and 2 deletions
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4
libavcodec/mdec.c
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@ -100,8 +100,8 @@ static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n)
LAST_SKIP_BITS(re, &a->gb, 1);
} else {
/* escape */
run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
UPDATE_CACHE(re, &a->gb);
run = SHOW_UBITS(re, &a->gb, 6) + 1;
SKIP_BITS(re, &a->gb, 6);
level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
i += run;
if (i > 63) {