[MPlayer-dev-eng] weird al hotfix :)

[Michael Niedermayer]

Hi

On Tuesday 01 January 2002 17:20, Michael Niedermayer wrote:
[...]
>
> no w.asf has 0x17 like every other file i tried ... except one :)
> .... and that is left_edge_artifacts_in_ffmpeg.avi it has 0x18
> now things starting to make sense
> 0x18 means that the image is encoded as 2 slices so there can be no ac/dc
> prediction between them i guess
heres the real fix :)))))

-----Hand made diff from libavcodec/msmpeg4.c----
    /* special slice handling */
    if (s->mb_x == 0) {
        if (s->slice_height && (s->mb_y % s->slice_height) == 0) {
            int wrap;
            /* reset DC pred (set previous line to 1024) */
            wrap = 2 * s->mb_width + 2;
            memsetw(&s->dc_val[0][(1) + (2 * s->mb_y) * wrap],
                    1024, 2 * s->mb_width);
            wrap = s->mb_width + 2;
            memsetw(&s->dc_val[1][(1) + (s->mb_y) * wrap],
                    1024, s->mb_width);
            memsetw(&s->dc_val[2][(1) + (s->mb_y) * wrap],
                    1024, s->mb_width);
            
+            /* reset AC pred (set previous line to 0) */
+            wrap = s->mb_width * 2 + 2;
+            memsetw(s->ac_val[0][0] + (1 + (2 * s->mb_y) * wrap)*16,
+                    0, 2 * s->mb_width*16);
+            wrap = s->mb_width + 2;
+            memsetw(s->ac_val[1][0] + (1 + (s->mb_y) * wrap)*16,
+                    0, s->mb_width*16);
+            memsetw(s->ac_val[2][0] + (1 + (s->mb_y) * wrap)*16,
+                    0, s->mb_width*16);

            s->first_slice_line = 1;
        } else {
            s->first_slice_line = 0;
        }
    }
--------end-------
[...]

ill test it a bit, and if its ok than ill send a patch to the ffmpeg list in 
case noone has applied it earlier

Michael