int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb) { int pqindex, lowquant, status; if (v->finterpflag) v->interpfrm = get_bits1(gb); if (!v->s.avctx->codec) return -1; if (v->s.avctx->codec_id == AV_CODEC_ID_MSS2) v->respic = v->rangered = v->multires = get_bits(gb, 2) == 1; else skip_bits(gb, 2); //framecnt unused v->rangeredfrm = 0; if (v->rangered) v->rangeredfrm = get_bits1(gb); v->s.pict_type = get_bits1(gb); if (v->s.avctx->max_b_frames) { if (!v->s.pict_type) { if (get_bits1(gb)) v->s.pict_type = AV_PICTURE_TYPE_I; else v->s.pict_type = AV_PICTURE_TYPE_B; } else v->s.pict_type = AV_PICTURE_TYPE_P; } else v->s.pict_type = v->s.pict_type ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I; v->bi_type = 0; if (v->s.pict_type == AV_PICTURE_TYPE_B) { if (read_bfraction(v, gb) < 0) return AVERROR_INVALIDDATA; if (v->bfraction == 0) { v->s.pict_type = AV_PICTURE_TYPE_BI; } } if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI) skip_bits(gb, 7); // skip buffer fullness if (v->parse_only) return 0; /* calculate RND */ if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI) v->rnd = 1; if (v->s.pict_type == AV_PICTURE_TYPE_P) v->rnd ^= 1; /* Quantizer stuff */ pqindex = get_bits(gb, 5); if (!pqindex) return -1; if (v->quantizer_mode == QUANT_FRAME_IMPLICIT) v->pq = ff_vc1_pquant_table[0][pqindex]; else v->pq = ff_vc1_pquant_table[1][pqindex]; v->pquantizer = 1; if (v->quantizer_mode == QUANT_FRAME_IMPLICIT) v->pquantizer = pqindex < 9; if (v->quantizer_mode == QUANT_NON_UNIFORM) v->pquantizer = 0; v->pqindex = pqindex; if (pqindex < 9) v->halfpq = get_bits1(gb); else v->halfpq = 0; if (v->quantizer_mode == QUANT_FRAME_EXPLICIT) v->pquantizer = get_bits1(gb); v->dquantfrm = 0; if (v->extended_mv == 1) v->mvrange = get_unary(gb, 0, 3); v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13 v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11 v->range_x = 1 << (v->k_x - 1); v->range_y = 1 << (v->k_y - 1); if (v->multires && v->s.pict_type != AV_PICTURE_TYPE_B) v->respic = get_bits(gb, 2); if (v->res_x8 && (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI)) { v->x8_type = get_bits1(gb); } else v->x8_type = 0; av_dlog(v->s.avctx, "%c Frame: QP=[%i]%i (+%i/2) %i\n", (v->s.pict_type == AV_PICTURE_TYPE_P) ? 'P' : ((v->s.pict_type == AV_PICTURE_TYPE_I) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm); if (v->first_pic_header_flag) rotate_luts(v); switch (v->s.pict_type) { case AV_PICTURE_TYPE_P: if (v->pq < 5) v->tt_index = 0; else if (v->pq < 13) v->tt_index = 1; else v->tt_index = 2; lowquant = (v->pq > 12) ? 0 : 1; v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)]; if (v->mv_mode == MV_PMODE_INTENSITY_COMP) { v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)]; v->lumscale = get_bits(gb, 6); v->lumshift = get_bits(gb, 6); v->last_use_ic = 1; /* fill lookup tables for intensity compensation */ INIT_LUT(v->lumscale, v->lumshift, v->last_luty[0], v->last_lutuv[0], 1); INIT_LUT(v->lumscale, v->lumshift, v->last_luty[1], v->last_lutuv[1], 1); } v->qs_last = v->s.quarter_sample; if (v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN) v->s.quarter_sample = 0; else if (v->mv_mode == MV_PMODE_INTENSITY_COMP) { if (v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN) v->s.quarter_sample = 0; else v->s.quarter_sample = 1; } else v->s.quarter_sample = 1; v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN || (v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)); if ((v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_MIXED_MV) || v->mv_mode == MV_PMODE_MIXED_MV) { status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v); if (status < 0) return -1; av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: " "Imode: %i, Invert: %i\n", status>>1, status&1); } else { v->mv_type_is_raw = 0; memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height); } 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); /* Hopefully this is correct for P frames */ v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)]; if (v->dquant) { av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n"); vop_dquant_decoding(v); } v->ttfrm = 0; //FIXME Is that so ? if (v->vstransform) { v->ttmbf = get_bits1(gb); if (v->ttmbf) { v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)]; } } else { v->ttmbf = 1; v->ttfrm = TT_8X8; } break; case AV_PICTURE_TYPE_B: if (v->pq < 5) v->tt_index = 0; else if (v->pq < 13) v->tt_index = 1; else v->tt_index = 2; v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN; v->qs_last = v->s.quarter_sample; v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV); v->s.mspel = v->s.quarter_sample; 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); v->s.mv_table_index = get_bits(gb, 2); v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)]; if (v->dquant) { av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n"); vop_dquant_decoding(v); } v->ttfrm = 0; if (v->vstransform) { v->ttmbf = get_bits1(gb); if (v->ttmbf) { v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)]; } } else { v->ttmbf = 1; v->ttfrm = TT_8X8; } break; } if (!v->x8_type) { /* AC Syntax */ v->c_ac_table_index = decode012(gb); if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI) { v->y_ac_table_index = decode012(gb); } /* DC Syntax */ v->s.dc_table_index = get_bits1(gb); } if (v->s.pict_type == AV_PICTURE_TYPE_BI) { v->s.pict_type = AV_PICTURE_TYPE_B; v->bi_type = 1; } return 0; }