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Code Issues Releases Activity

avcodec/mpeg4video: Don't use ac_val[1], ac_val[2] when cleaning buffers

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This is in preparation for removing removing ac_val[1]
and ac_val[2]. ff_mpeg4_clean_buffers() was the last user of them.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-06-13 04:25:13 +02:00
parent b2661569b1
commit 4aca6b19ac
1 changed files with 5 additions and 4 deletions
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9
libavcodec/mpeg4video.c
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@ -43,17 +43,18 @@ int ff_mpeg4_get_video_packet_prefix_length(enum AVPictureType pict_type,
void ff_mpeg4_clean_buffers(MpegEncContext *s)
{
int c_wrap, c_xy, l_wrap, l_xy;
const int mb_height = s->mb_height;
int c_wrap, l_wrap, l_xy;
l_wrap = s->b8_stride;
l_xy = (2 * s->mb_y - 1) * l_wrap + s->mb_x * 2 - 1;
c_wrap = s->mb_stride;
c_xy = (s->mb_y - 1) * c_wrap + s->mb_x - 1;
int u_xy = 2 * mb_height * l_wrap + s->mb_y * c_wrap + s->mb_x - 1;
/* clean AC */
memset(s->ac_val[0] + l_xy, 0, (l_wrap * 2 + 1) * 16 * sizeof(int16_t));
memset(s->ac_val[1] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t));
memset(s->ac_val[2] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t));
memset(s->ac_val[0] + u_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t));
memset(s->ac_val[0] + u_xy + c_wrap * (mb_height + 1), 0, (c_wrap + 1) * 16 * sizeof(int16_t));
/* clean MV */
// we can't clear the MVs as they might be needed by a B-frame