From: Michael Niedermayer <michaelni@gmx.at>
Date: Thu, 18 Oct 2012 23:20:27 +0000 (+0200)
Subject: motionpixels/mp_decode_frame_helper: assert that the first pixel doesnt reuse the... 
X-Git-Tag: android-x86-4.4-r1~8736
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=05b0337025f629d0a6c6321147f06d0da5e32a62;p=android-x86%2Fexternal-ffmpeg.git

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@gmx.at>
---

diff --git a/libavcodec/motionpixels.c b/libavcodec/motionpixels.c
index 471f63f5a5..73667130ac 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));