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avcodec/h261enc: Don't use (size_t)-1

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Fixes "runtime error: addition of unsigned offset to 0x765a09523a90
overflowed to 0x765a09523a8e". This fixes all H.261 tests when run
under UBsan.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-03-17 09:53:42 +01:00
parent 950ad969fb
commit fbcc943b22
1 changed files with 1 additions and 1 deletions
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2
libavcodec/h261enc.c
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@@ -337,7 +337,7 @@ static av_cold void h261_encode_init_static(void)
uni_h261_rl_len_last[UNI_AC_ENC_INDEX(run, 64 - level)] = len + 2;
}
for (size_t i = 1;; i++) {
for (ptrdiff_t i = 1;; i++) {
// sign-one MV codes; diff -16..-1, 16..31
mv_codes[32 - i][0] = mv_codes[-i][0] = (ff_h261_mv_tab[i][0] << 1) | 1 /* sign */;
mv_codes[32 - i][1] = mv_codes[-i][1] = ff_h261_mv_tab[i][1] + 1;