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avcodec_find_best_pix_fmt_of_2: favor formats with fewer components if it does not incur a loss.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-11-21 16:59:37 +01:00
parent 649d8bd8a5
commit 0880f26bbe
1 changed files with 7 additions and 1 deletions
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8
libavcodec/imgconvert.c
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@ -551,6 +551,8 @@ enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt
{
enum AVPixelFormat dst_pix_fmt;
int loss1, loss2, loss_order1, loss_order2, i, loss_mask;
const AVPixFmtDescriptor *desc1 = av_pix_fmt_desc_get(dst_pix_fmt1);
const AVPixFmtDescriptor *desc2 = av_pix_fmt_desc_get(dst_pix_fmt2);
static const int loss_mask_order[] = {
~0, /* no loss first */
~FF_LOSS_ALPHA,
@ -577,7 +579,11 @@ enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt
loss_order2 = loss2 & loss_mask_order[i];
if (loss_order1 == 0 && loss_order2 == 0 && dst_pix_fmt2 != AV_PIX_FMT_NONE && dst_pix_fmt1 != AV_PIX_FMT_NONE){ /* use format with smallest depth */
dst_pix_fmt = avg_bits_per_pixel(dst_pix_fmt2) < avg_bits_per_pixel(dst_pix_fmt1) ? dst_pix_fmt2 : dst_pix_fmt1;
if(avg_bits_per_pixel(dst_pix_fmt2) != avg_bits_per_pixel(dst_pix_fmt1)) {
dst_pix_fmt = avg_bits_per_pixel(dst_pix_fmt2) < avg_bits_per_pixel(dst_pix_fmt1) ? dst_pix_fmt2 : dst_pix_fmt1;
} else {
dst_pix_fmt = desc2->nb_components < desc1->nb_components ? dst_pix_fmt2 : dst_pix_fmt1;
}
} else if (loss_order1 == 0 || loss_order2 == 0) { /* use format with no loss */
dst_pix_fmt = loss_order2 ? dst_pix_fmt1 : dst_pix_fmt2;
}