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avcodec/imgconvert: Fix loss mask bug in avcodec_find_best_pix_fmt_of_list()

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example:

AVPixelFormat pixFmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA };
int loss = 0;
AVPixelFormat best = avcodec_find_best_pix_fmt_of_list(pixFmts, AV_PIX_FMT_BGRA, 1, &loss);

best is AV_PIX_FMT_RGB24. But AV_PIX_FMT_RGBA is better.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
heimdallr 2018-03-31 19:37:23 +07:00 committed by Michael Niedermayer
parent 78b6887da3
commit 354b26a394
1 changed files with 6 additions and 2 deletions
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8
libavcodec/imgconvert.c
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@ -69,10 +69,14 @@ enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *p
int i;
enum AVPixelFormat best = AV_PIX_FMT_NONE;
int loss;
for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
for (i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++) {
loss = *loss_ptr;
best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, &loss);
}
*loss_ptr = loss;
return best;
}