[FFmpeg-cvslog] motionpixels/mp_decode_frame_helper: assert that the first pixel doesnt reuse the last.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Fri Oct 19 01:20:27 2012 +0200| [05b0337025f629d0a6c6321147f06d0da5e32a62] | committer: Michael Niedermayer

motionpixels/mp_decode_frame_helper: assert that the first pixel doesnt reuse the last.

reusing the last would use uninitialized data, this should be
impossible currently, but better to check by assert.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=05b0337025f629d0a6c6321147f06d0da5e32a62
---

 libavcodec/motionpixels.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/motionpixels.c b/libavcodec/motionpixels.c
index 471f63f..7366713 100644
--- a/libavcodec/motionpixels.c
+++ b/libavcodec/motionpixels.c
@@ -220,6 +220,8 @@ static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
     YuvPixel p;
     int y, y0;
 
+    av_assert1(mp->changes_map[0]);
+
     for (y = 0; y < mp->avctx->height; ++y) {
         if (mp->changes_map[y * mp->avctx->width] != 0) {
             memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));