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* [FFmpeg-devel] [PATCH] avcodec/mpeg4videodec: Align idct-block appropriately
@ 2024-03-13  0:53 Andreas Rheinhardt
  2024-03-13  8:30 ` Kieran Kunhya
  2024-03-14 20:49 ` Sean McGovern
  0 siblings, 2 replies; 4+ messages in thread
From: Andreas Rheinhardt @ 2024-03-13  0:53 UTC (permalink / raw)
  To: ffmpeg-devel; +Cc: Andreas Rheinhardt

It is accessed via AV_RN64() 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

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/mpeg4videodec.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/mpeg4videodec.h b/libavcodec/mpeg4videodec.h
index c0e6ec6592..4a26d18987 100644
--- a/libavcodec/mpeg4videodec.h
+++ b/libavcodec/mpeg4videodec.h
@@ -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];
-- 
2.40.1

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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [FFmpeg-devel] [PATCH] avcodec/mpeg4videodec: Align idct-block appropriately
  2024-03-13  0:53 [FFmpeg-devel] [PATCH] avcodec/mpeg4videodec: Align idct-block appropriately Andreas Rheinhardt
@ 2024-03-13  8:30 ` Kieran Kunhya
  2024-03-14 20:49 ` Sean McGovern
  1 sibling, 0 replies; 4+ messages in thread
From: Kieran Kunhya @ 2024-03-13  8:30 UTC (permalink / raw)
  To: FFmpeg development discussions and patches; +Cc: Andreas Rheinhardt

On Wed, 13 Mar 2024 at 00:53, Andreas Rheinhardt <
andreas.rheinhardt@outlook.com> wrote:

> It is accessed via AV_RN64() 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
>
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
>

LGTM
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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [FFmpeg-devel] [PATCH] avcodec/mpeg4videodec: Align idct-block appropriately
  2024-03-13  0:53 [FFmpeg-devel] [PATCH] avcodec/mpeg4videodec: Align idct-block appropriately Andreas Rheinhardt
  2024-03-13  8:30 ` Kieran Kunhya
@ 2024-03-14 20:49 ` Sean McGovern
  2024-03-14 20:51   ` Andreas Rheinhardt
  1 sibling, 1 reply; 4+ messages in thread
From: Sean McGovern @ 2024-03-14 20:49 UTC (permalink / raw)
  To: FFmpeg development discussions and patches

Andreas:

On Tue, Mar 12, 2024 at 8:53 PM Andreas Rheinhardt
<andreas.rheinhardt@outlook.com> wrote:
>
> It is accessed via AV_RN64() 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
>
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  libavcodec/mpeg4videodec.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/mpeg4videodec.h b/libavcodec/mpeg4videodec.h
> index c0e6ec6592..4a26d18987 100644
> --- a/libavcodec/mpeg4videodec.h
> +++ b/libavcodec/mpeg4videodec.h
> @@ -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];
> --
> 2.40.1
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".

Confirming that this fixes fate-mpeg4-simple-studio-profile on PowerPC
QEMU with GCC UBsan as noted.

It was not failing on POWER7 (ppc64) or POWER9 (ppc64le).

Thanks,
Sean McGovern
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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [FFmpeg-devel] [PATCH] avcodec/mpeg4videodec: Align idct-block appropriately
  2024-03-14 20:49 ` Sean McGovern
@ 2024-03-14 20:51   ` Andreas Rheinhardt
  0 siblings, 0 replies; 4+ messages in thread
From: Andreas Rheinhardt @ 2024-03-14 20:51 UTC (permalink / raw)
  To: ffmpeg-devel

Sean McGovern:
> Andreas:
> 
> On Tue, Mar 12, 2024 at 8:53 PM Andreas Rheinhardt
> <andreas.rheinhardt@outlook.com> wrote:
>>
>> It is accessed via AV_RN64() 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
>>
>> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
>> ---
>>  libavcodec/mpeg4videodec.h | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/libavcodec/mpeg4videodec.h b/libavcodec/mpeg4videodec.h
>> index c0e6ec6592..4a26d18987 100644
>> --- a/libavcodec/mpeg4videodec.h
>> +++ b/libavcodec/mpeg4videodec.h
>> @@ -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];
>> --
>> 2.40.1
>>
>> _______________________________________________
>> ffmpeg-devel mailing list
>> ffmpeg-devel@ffmpeg.org
>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>>
>> To unsubscribe, visit link above, or email
>> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
> 
> Confirming that this fixes fate-mpeg4-simple-studio-profile on PowerPC
> QEMU with GCC UBsan as noted.
> 
> It was not failing on POWER7 (ppc64) or POWER9 (ppc64le).
> 

Not surprising: The Mpeg4VideoDSPContext immediately before block32
contains (function) pointers and therefore has alignment 8 on 64bit
machines, so that block32 happens to be properly aligned already.

- Andreas

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^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2024-03-14 20:51 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2024-03-13  0:53 [FFmpeg-devel] [PATCH] avcodec/mpeg4videodec: Align idct-block appropriately Andreas Rheinhardt
2024-03-13  8:30 ` Kieran Kunhya
2024-03-14 20:49 ` Sean McGovern
2024-03-14 20:51   ` Andreas Rheinhardt

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