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avcodec/utvideodec: fix gradient prediction when stride does not match width

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Fixes #6340.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-04-21 21:44:28 +02:00
parent 9ef21a897c
commit 4925537004
1 changed files with 10 additions and 2 deletions
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12
libavcodec/utvideodec.c
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@ -676,7 +676,11 @@ static void restore_gradient_planar_il(UtvideoContext *c, uint8_t *src, ptrdiff_
C = bsrc[i - 1];
bsrc[i] = (A - B + C + bsrc[i]) & 0xFF;
}
for (i = 0; i < width; i++) {
A = bsrc[-stride];
B = bsrc[-(1 + stride + stride - width)];
C = bsrc[width - 1];
bsrc[stride] = (A - B + C + bsrc[stride]) & 0xFF;
for (i = 1; i < width; i++) {
A = bsrc[i - stride];
B = bsrc[i - (1 + stride)];
C = bsrc[i - 1 + stride];
@ -774,7 +778,11 @@ static void restore_gradient_packed_il(uint8_t *src, int step, ptrdiff_t stride,
C = bsrc[i - step];
bsrc[i] = (A - B + C + bsrc[i]) & 0xFF;
}
for (i = 0; i < width * step; i += step) {
A = bsrc[-stride];
B = bsrc[-(step + stride + stride - width * step)];
C = bsrc[width * step - step];
bsrc[stride] = (A - B + C + bsrc[stride]) & 0xFF;
for (i = step; i < width * step; i += step) {
A = bsrc[i - stride];
B = bsrc[i - (step + stride)];
C = bsrc[i - step + stride];