avcodec/magicyuv: fix decoding of raw slices

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/magicyuv.c

@@ -124,13 +124,23 @@ static int decode_slice(AVCodecContext *avctx, void *tdata,
         int sheight = AV_CEIL_RSHIFT(s->slice_height, s->vshift[i]);
         int fake_stride = p->linesize[i] * (1 + interlaced);
         int stride = p->linesize[i];
-        int pred;
+        int flags, pred;
 
         if ((ret = init_get_bits8(&b, s->buf + s->slices[i][j].start, s->slices[i][j].size)) < 0)
             return ret;
 
-        pred = get_bits(&b, 16);
+        flags = get_bits(&b, 8);
+        pred  = get_bits(&b, 8);
+
         dst = p->data[i] + j * sheight * stride;
+        if (flags & 1) {
+            for (k = 0; k < height; k++) {
+                for (x = 0; x < width; x++) {
+                    dst[x] = get_bits(&b, 8);
+                }
+                dst += stride;
+            }
+        } else {
             for (k = 0; k < height; k++) {
                 for (x = 0; x < width; x++) {
                     int pix;
@@ -145,6 +155,7 @@ static int decode_slice(AVCodecContext *avctx, void *tdata,
                 }
                 dst += stride;
             }
+        }
 
         if (pred == LEFT) {
             dst = p->data[i] + j * sheight * stride;