[FFmpeg-devel] [PATCH 4/7] avcodec/mpegvideo_enc: Add missing emms_c() to clear MMX state after SIMD use

[Michael Niedermayer]

On Fri, Oct 21, 2016 at 03:31:43PM +0200, Michael Niedermayer wrote:
> Fixes undefined behavior due to calling libc allocation with unclean FPU state
> 
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/mpegvideo_enc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
> index f34003e..b2c5eab 100644
> --- a/libavcodec/mpegvideo_enc.c
> +++ b/libavcodec/mpegvideo_enc.c
> @@ -1320,6 +1320,7 @@ static int load_input_picture(MpegEncContext *s, const AVFrame *pic_arg)
>                                                  EDGE_BOTTOM);
>                      }
>                  }
> +                emms_c();
>              }
>          }
>          ret = av_frame_copy_props(pic->f, pic_arg);

> @@ -1890,6 +1891,7 @@ int ff_mpv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
>              return ret;
>  vbv_retry:
>          ret = encode_picture(s, s->picture_number);
> +//         emms_c();

this was not intended to be here ...

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Modern terrorism, a quick summary: Need oil, start war with country that
has oil, kill hundread thousand in war. Let country fall into chaos,
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people, be surprised about them taking revenge and drop even more bombs
and strip your own citizens of their rights and freedoms. to be continued
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