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vc1: implement frame interlaced b-frame header parsing 

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Hendrik Leppkes 2012-01-23 22:17:46 +01:00 committed by Martin Storsjö
parent 46430fd47c
commit fe06795d78
1 changed files with 40 additions and 3 deletions
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43
libavcodec/vc1.c
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@ -1138,9 +1138,14 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
}
break;
case AV_PICTURE_TYPE_B:
// TODO: implement interlaced frame B picture decoding
if (v->fcm == ILACE_FRAME)
return -1;
if (v->fcm == ILACE_FRAME) {
v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
v->bfraction = ff_vc1_bfraction_lut[v->bfraction_lut_index];
if (v->bfraction == 0) {
return -1;
}
return -1; // This codepath is still incomplete thus it is disabled
}
if (v->extended_mv)
v->mvrange = get_unary(gb, 0, 3);
else
@ -1186,6 +1191,38 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
v->fourmvbp_vlc = &ff_vc1_4mv_block_pattern_vlc[fourmvbptab];
}
v->numref = 1; // interlaced field B pictures are always 2-ref
} else if (v->fcm == ILACE_FRAME) {
if (v->extended_dmv)
v->dmvrange = get_unary(gb, 0, 3);
if (get_bits1(gb)) /* intcomp - present but shall always be 0 */
av_log(v->s.avctx, AV_LOG_WARNING, "Intensity compensation set for B picture\n");
v->intcomp = 0;
v->mv_mode = MV_PMODE_1MV;
v->fourmvswitch = 0;
v->qs_last = v->s.quarter_sample;
v->s.quarter_sample = 1;
v->s.mspel = 1;
status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
mbmodetab = get_bits(gb, 2);
v->mbmode_vlc = &ff_vc1_intfr_non4mv_mbmode_vlc[mbmodetab];
imvtab = get_bits(gb, 2);
v->imv_vlc = &ff_vc1_1ref_mvdata_vlc[imvtab];
// interlaced p/b-picture cbpcy range is [1, 63]
icbptab = get_bits(gb, 3);
v->cbpcy_vlc = &ff_vc1_icbpcy_vlc[icbptab];
twomvbptab = get_bits(gb, 2);
v->twomvbp_vlc = &ff_vc1_2mv_block_pattern_vlc[twomvbptab];
fourmvbptab = get_bits(gb, 2);
v->fourmvbp_vlc = &ff_vc1_4mv_block_pattern_vlc[fourmvbptab];
} else {
v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
v->qs_last = v->s.quarter_sample;