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vc1: always read the bfraction element for interlaced fields
Previously, it would not be read if refdist_flag was not set, however according to the spec and the reference decoder, it should always be read. Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
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parent
7de9af65c7
commit
feaa40020b
@ -894,20 +894,18 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
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if (v->field_mode) {
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if (!v->refdist_flag)
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v->refdist = 0;
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else {
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if ((v->s.pict_type != AV_PICTURE_TYPE_B)
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&& (v->s.pict_type != AV_PICTURE_TYPE_BI)) {
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v->refdist = get_bits(gb, 2);
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if (v->refdist == 3)
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v->refdist += get_unary(gb, 0, 16);
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} else {
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v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
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v->bfraction = ff_vc1_bfraction_lut[v->bfraction_lut_index];
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v->frfd = (v->bfraction * v->refdist) >> 8;
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v->brfd = v->refdist - v->frfd - 1;
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if (v->brfd < 0)
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v->brfd = 0;
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}
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else if ((v->s.pict_type != AV_PICTURE_TYPE_B) && (v->s.pict_type != AV_PICTURE_TYPE_BI)) {
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v->refdist = get_bits(gb, 2);
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if (v->refdist == 3)
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v->refdist += get_unary(gb, 0, 16);
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}
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if ((v->s.pict_type == AV_PICTURE_TYPE_B) || (v->s.pict_type == AV_PICTURE_TYPE_BI)) {
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v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
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v->bfraction = ff_vc1_bfraction_lut[v->bfraction_lut_index];
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v->frfd = (v->bfraction * v->refdist) >> 8;
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v->brfd = v->refdist - v->frfd - 1;
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if (v->brfd < 0)
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v->brfd = 0;
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}
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goto parse_common_info;
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}
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