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mpeg4videoenc: Don't crash with -fsanitize=bounds

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Also the patch makes this code consistent with mpeg4videodec.c

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit f163d30de2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Vitaly Buka 2020-04-21 21:34:19 -07:00 committed by Michael Niedermayer
parent 57ef3712d7
commit 34c4c9114c
1 changed files with 2 additions and 2 deletions
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4
libavcodec/mpeg4videoenc.c
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@ -104,7 +104,7 @@ static inline void restore_ac_coeffs(MpegEncContext *s, int16_t block[6][64],
memcpy(s->block_last_index, zigzag_last_index, sizeof(int) * 6);
for (n = 0; n < 6; n++) {
int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
int16_t *ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
st[n] = s->intra_scantable.permutated;
if (dir[n]) {
@ -143,7 +143,7 @@ static inline int decide_ac_pred(MpegEncContext *s, int16_t block[6][64],
score -= get_block_rate(s, block[n], s->block_last_index[n],
s->intra_scantable.permutated);
ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
ac_val1 = ac_val;
if (dir[n]) {
const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;