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

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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>
This commit is contained in:
Michael Niedermayer 2012-10-19 01:20:27 +02:00
parent df727d408c
commit 05b0337025
1 changed files with 2 additions and 0 deletions
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libavcodec/motionpixels.c
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@ -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));