av_picture_crop(): Support simple cases with packed pixels too.

This fixes a regression when linked to old ffmpeg.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/imgconvert.c

@@ -790,15 +790,23 @@ int av_picture_crop(AVPicture *dst, const AVPicture *src,
     int y_shift;
     int x_shift;
 
-    if (pix_fmt < 0 || pix_fmt >= PIX_FMT_NB || !is_yuv_planar(&pix_fmt_info[pix_fmt]))
+    if (pix_fmt < 0 || pix_fmt >= PIX_FMT_NB)
         return -1;
 
     y_shift = av_pix_fmt_descriptors[pix_fmt].log2_chroma_h;
     x_shift = av_pix_fmt_descriptors[pix_fmt].log2_chroma_w;
 
+    if (is_yuv_planar(&pix_fmt_info[pix_fmt])) {
     dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
     dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
     dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
+    } else{
+        if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
+            return -1;
+        if(left_band) //FIXME add support for this too
+            return -1;
+        dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
+    }
 
     dst->linesize[0] = src->linesize[0];
     dst->linesize[1] = src->linesize[1];