[FFmpeg-devel] [PR] avcodec/vc1dec: Reduce size of allocation (PR #21360)

[mkver via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21360 opened by mkver
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21360
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21360.patch

blk_mv_type is only set for block 0-3, not for chroma blocks,
so it only needs four elements per MB.


>From 98aa4e2bc07ea5ec764f763ad0a2475ed6171f00 Mon Sep 17 00:00:00 2001
From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Date: Fri, 2 Jan 2026 19:21:59 +0100
Subject: [PATCH] avcodec/vc1dec: Reduce size of allocation

blk_mv_type is only set for block 0-3, not for chroma blocks,
so it only needs four elements per MB.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/vc1dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 6caa418134..72bc810ce7 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -399,7 +399,7 @@ static av_cold int vc1_decode_init_alloc_tables(VC1Context *v)
     v->mb_type = v->mb_type_base + s->b8_stride + 1;
 
     /* allocate memory to store block level MV info */
-    v->blk_mv_type_base = av_mallocz(     s->b8_stride * (mb_height * 2 + 1) + s->mb_stride * (mb_height + 1) * 2);
+    v->blk_mv_type_base = av_mallocz(     s->b8_stride * (mb_height * 2 + 1));
     if (!v->blk_mv_type_base)
         return AVERROR(ENOMEM);
     v->blk_mv_type      = v->blk_mv_type_base + s->b8_stride + 1;
-- 
2.49.1

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