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imgconvert: avoid undefined left shift in avcodec_find_best_pix_fmt

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CC: libav-stable@libav.org
(cherry picked from commit 39bb27bf79)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
(cherry picked from commit 7a7229b52d)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Janne Grunau 2012-07-02 10:46:39 +02:00 committed by Anton Khirnov
parent f31170d4e7
commit 8812b5f164
1 changed files with 2 additions and 1 deletions
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3
libavcodec/imgconvert.c
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@ -615,7 +615,8 @@ static enum PixelFormat avcodec_find_best_pix_fmt1(int64_t pix_fmt_mask,
/* find exact color match with smallest size */
dst_pix_fmt = PIX_FMT_NONE;
min_dist = 0x7fffffff;
for(i = 0;i < PIX_FMT_NB; i++) {
/* test only the first 64 pixel formats to avoid undefined behaviour */
for (i = 0; i < 64; i++) {
if (pix_fmt_mask & (1ULL << i)) {
loss = avcodec_get_pix_fmt_loss(i, src_pix_fmt, has_alpha) & loss_mask;
if (loss == 0) {