[FFmpeg-cvslog] avcodec/vc1_block: Simplify resetting coded_block

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Sat Jun  8 01:28:16 2024 +0200| [963bdac226b611664bdd033a8b3a914e5e148ebd] | committer: Andreas Rheinhardt

avcodec/vc1_block: Simplify resetting coded_block

Everything that init_block_index() sets will be overwritten
a few lines below again, so don't call it and simply calculate
the only thing that is used (namely block_index[0]) manually.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=963bdac226b611664bdd033a8b3a914e5e148ebd
---

 libavcodec/vc1_block.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c
index 384979caf5..1d622b1a67 100644
--- a/libavcodec/vc1_block.c
+++ b/libavcodec/vc1_block.c
@@ -2680,8 +2680,7 @@ static int vc1_decode_i_blocks_adv(VC1Context *v)
     s->mb_x             = 0;
     s->mb_y             = s->start_mb_y;
     if (s->start_mb_y) {
-        init_block_index(v);
-        memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,
+        memset(&s->coded_block[(2 * s->mb_y - 1) * s->b8_stride - 2], 0,
                (1 + s->b8_stride) * sizeof(*s->coded_block));
     }
     for (; s->mb_y < s->end_mb_y; s->mb_y++) {