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avcodec/mpeg4videodec: Align idct-block appropriately 

It is accessed via AV_RN64A in ff_simple_idct_put_int32_10bit().
Should fix the UBSan failures in the mpeg4-simple-studio-profile
test here:
https://fate.ffmpeg.org/report.cgi?time=20240312011016&slot=ppc-linux-gcc-13.2-ubsan-altivec-qemu

Reviewed-by: Kieran Kunhya <kierank@obe.tv>
Tested-by: Sean McGovern <gseanmcg@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-03-13 01:49:54 +01:00
parent cc2d2b665e
commit 8e207bf463
1 changed files with 2 additions and 1 deletions
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3
libavcodec/mpeg4videodec.h
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@ -29,6 +29,7 @@
#include "mpegvideo.h"
#include "mpeg4videodsp.h"
#include "libavutil/mem_internal.h"
typedef struct Mpeg4DecContext {
MpegEncContext m;
@ -83,7 +84,7 @@ typedef struct Mpeg4DecContext {
Mpeg4VideoDSPContext mdsp;
int32_t block32[12][64];
DECLARE_ALIGNED(8, int32_t, block32)[12][64];
// 0 = DCT, 1 = DPCM top to bottom scan, -1 = DPCM bottom to top scan
int dpcm_direction;
int16_t dpcm_macroblock[3][256];