vc1.c

    DSPContext *dsp = &v->s.dsp;
    uint8_t *srcU, *srcV;
    int uvdxy, uvmx, uvmy, uvsrc_x, uvsrc_y;
    int i, idx, tx = 0, ty = 0;
    int mvx[4], mvy[4], intra[4];
    static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

    if(!v->s.last_picture.data[0])return;
    if(s->flags & CODEC_FLAG_GRAY) return;

    for(i = 0; i < 4; i++) {
        mvx[i] = s->mv[0][i][0];
        mvy[i] = s->mv[0][i][1];
        intra[i] = v->mb_type[0][s->block_index[i]];
    }

    /* calculate chroma MV vector from four luma MVs */
    idx = (intra[3] << 3) | (intra[2] << 2) | (intra[1] << 1) | intra[0];
    if(!idx) { // all blocks are inter
        tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);
        ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);
    } else if(count[idx] == 1) { // 3 inter blocks
        switch(idx) {
        case 0x1:
            tx = mid_pred(mvx[1], mvx[2], mvx[3]);
            ty = mid_pred(mvy[1], mvy[2], mvy[3]);
            break;
        case 0x2:
            tx = mid_pred(mvx[0], mvx[2], mvx[3]);
            ty = mid_pred(mvy[0], mvy[2], mvy[3]);
            break;
        case 0x4:
            tx = mid_pred(mvx[0], mvx[1], mvx[3]);
            ty = mid_pred(mvy[0], mvy[1], mvy[3]);
            break;
        case 0x8:
            tx = mid_pred(mvx[0], mvx[1], mvx[2]);
            ty = mid_pred(mvy[0], mvy[1], mvy[2]);
            break;
        }
    } else if(count[idx] == 2) {
        int t1 = 0, t2 = 0;
        for(i=0; i<3;i++) if(!intra[i]) {t1 = i; break;}
        for(i= t1+1; i<4; i++)if(!intra[i]) {t2 = i; break;}
        tx = (mvx[t1] + mvx[t2]) / 2;
        ty = (mvy[t1] + mvy[t2]) / 2;
    } else
        return; //no need to do MC for inter blocks

    s->current_picture.motion_val[1][s->block_index[0]][0] = tx;
    s->current_picture.motion_val[1][s->block_index[0]][1] = ty;
    uvmx = (tx + ((tx&3) == 3)) >> 1;
    uvmy = (ty + ((ty&3) == 3)) >> 1;
    if(v->fastuvmc) {
        uvmx = uvmx + ((uvmx<0)?(uvmx&1):-(uvmx&1));
        uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));
    }

    uvsrc_x = s->mb_x * 8 + (uvmx >> 2);
    uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

    uvsrc_x = clip(uvsrc_x,  -8, s->mb_width  *  8);
    uvsrc_y = clip(uvsrc_y,  -8, s->mb_height *  8);
    srcU = s->last_picture.data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;
    srcV = s->last_picture.data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;
    if(v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)
       || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9
       || (unsigned)uvsrc_y > (s->v_edge_pos >> 1) - 9){
        ff_emulated_edge_mc(s->edge_emu_buffer     , srcU, s->uvlinesize, 8+1, 8+1,
                            uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);
        ff_emulated_edge_mc(s->edge_emu_buffer + 16, srcV, s->uvlinesize, 8+1, 8+1,
                            uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);
        srcU = s->edge_emu_buffer;
        srcV = s->edge_emu_buffer + 16;

        /* if we deal with range reduction we need to scale source blocks */
        if(v->rangeredfrm) {
            int i, j;
            uint8_t *src, *src2;

            src = srcU; src2 = srcV;
            for(j = 0; j < 9; j++) {
                for(i = 0; i < 9; i++) {
                    src[i] = ((src[i] - 128) >> 1) + 128;
                    src2[i] = ((src2[i] - 128) >> 1) + 128;
                }
                src += s->uvlinesize;
                src2 += s->uvlinesize;
            }
        }
        /* if we deal with intensity compensation we need to scale source blocks */
        if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {
            int i, j;
            uint8_t *src, *src2;

            src = srcU; src2 = srcV;
            for(j = 0; j < 9; j++) {
                for(i = 0; i < 9; i++) {
                    src[i] = v->lutuv[src[i]];
                    src2[i] = v->lutuv[src2[i]];
                }
                src += s->uvlinesize;
                src2 += s->uvlinesize;
            }
        }
    }

    /* Chroma MC always uses qpel bilinear */
    uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);
    uvmx = (uvmx&3)<<1;
    uvmy = (uvmy&3)<<1;
    if(!v->rnd){
        dsp->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
        dsp->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
    }else{
        dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
        dsp->put_no_rnd_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
    }
}

static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb);

/**
 * Decode Simple/Main Profiles sequence header
 * @see Figure 7-8, p16-17
 * @param avctx Codec context
 * @param gb GetBit context initialized from Codec context extra_data
 * @return Status
 */
static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)
{
    VC1Context *v = avctx->priv_data;

    av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits(gb, 32));
    v->profile = get_bits(gb, 2);
    if (v->profile == 2)
    {
        av_log(avctx, AV_LOG_ERROR, "Profile value 2 is forbidden (and WMV3 Complex Profile is unsupported)\n");
        return -1;
    }

    if (v->profile == PROFILE_ADVANCED)
    {
        return decode_sequence_header_adv(v, gb);
    }
    else
    {
        v->res_sm = get_bits(gb, 2); //reserved
        if (v->res_sm)
        {
            av_log(avctx, AV_LOG_ERROR,
                   "Reserved RES_SM=%i is forbidden\n", v->res_sm);
            return -1;
        }
    }

    // (fps-2)/4 (->30)
    v->frmrtq_postproc = get_bits(gb, 3); //common
    // (bitrate-32kbps)/64kbps
    v->bitrtq_postproc = get_bits(gb, 5); //common
    v->s.loop_filter = get_bits(gb, 1); //common
    if(v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE)
    {
        av_log(avctx, AV_LOG_ERROR,
               "LOOPFILTER shell not be enabled in simple profile\n");
    }

    v->res_x8 = get_bits(gb, 1); //reserved
    if (v->res_x8)
    {
        av_log(avctx, AV_LOG_ERROR,
               "1 for reserved RES_X8 is forbidden\n");
        //return -1;
    }
    v->multires = get_bits(gb, 1);
    v->res_fasttx = get_bits(gb, 1);
    if (!v->res_fasttx)
    {
        av_log(avctx, AV_LOG_ERROR,
               "0 for reserved RES_FASTTX is forbidden\n");
        //return -1;
    }

    v->fastuvmc =  get_bits(gb, 1); //common
    if (!v->profile && !v->fastuvmc)
    {
        av_log(avctx, AV_LOG_ERROR,
               "FASTUVMC unavailable in Simple Profile\n");
        return -1;
    }
    v->extended_mv =  get_bits(gb, 1); //common
    if (!v->profile && v->extended_mv)
    {
        av_log(avctx, AV_LOG_ERROR,
               "Extended MVs unavailable in Simple Profile\n");
        return -1;
    }
    v->dquant =  get_bits(gb, 2); //common
    v->vstransform =  get_bits(gb, 1); //common

    v->res_transtab = get_bits(gb, 1);
    if (v->res_transtab)
    {
        av_log(avctx, AV_LOG_ERROR,
               "1 for reserved RES_TRANSTAB is forbidden\n");
        return -1;
    }

    v->overlap = get_bits(gb, 1); //common

    v->s.resync_marker = get_bits(gb, 1);
    v->rangered = get_bits(gb, 1);
    if (v->rangered && v->profile == PROFILE_SIMPLE)
    {
        av_log(avctx, AV_LOG_INFO,
               "RANGERED should be set to 0 in simple profile\n");
    }

    v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common
    v->quantizer_mode = get_bits(gb, 2); //common

    v->finterpflag = get_bits(gb, 1); //common
    v->res_rtm_flag = get_bits(gb, 1); //reserved
    if (!v->res_rtm_flag)
    {
//            av_log(avctx, AV_LOG_ERROR,
//                   "0 for reserved RES_RTM_FLAG is forbidden\n");
        av_log(avctx, AV_LOG_ERROR,
               "Old WMV3 version detected, only I-frames will be decoded\n");
        //return -1;
    }
    av_log(avctx, AV_LOG_DEBUG,
               "Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"
               "LoopFilter=%i, MultiRes=%i, FastUVMC=%i, Extended MV=%i\n"
               "Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"
               "DQuant=%i, Quantizer mode=%i, Max B frames=%i\n",
               v->profile, v->frmrtq_postproc, v->bitrtq_postproc,
               v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,
               v->rangered, v->vstransform, v->overlap, v->s.resync_marker,
               v->dquant, v->quantizer_mode, avctx->max_b_frames
               );
    return 0;
}

static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
{
    v->res_rtm_flag = 1;
    v->level = get_bits(gb, 3);
    if(v->level >= 5)
    {
        av_log(v->s.avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);
    }
    v->chromaformat = get_bits(gb, 2);
    if (v->chromaformat != 1)
    {
        av_log(v->s.avctx, AV_LOG_ERROR,
               "Only 4:2:0 chroma format supported\n");
        return -1;
    }

    // (fps-2)/4 (->30)
    v->frmrtq_postproc = get_bits(gb, 3); //common
    // (bitrate-32kbps)/64kbps
    v->bitrtq_postproc = get_bits(gb, 5); //common
    v->postprocflag = get_bits(gb, 1); //common

    v->s.avctx->coded_width = (get_bits(gb, 12) + 1) << 1;
    v->s.avctx->coded_height = (get_bits(gb, 12) + 1) << 1;
    v->broadcast = get_bits1(gb);
    v->interlace = get_bits1(gb);
    if(v->interlace){
        av_log(v->s.avctx, AV_LOG_ERROR, "Interlaced mode not supported (yet)\n");
        return -1;
    }
    v->tfcntrflag = get_bits1(gb);
    v->finterpflag = get_bits1(gb);
    get_bits1(gb); // reserved

    av_log(v->s.avctx, AV_LOG_DEBUG,
               "Advanced Profile level %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"
               "LoopFilter=%i, ChromaFormat=%i, Pulldown=%i, Interlace: %i\n"
               "TFCTRflag=%i, FINTERPflag=%i\n",
               v->level, v->frmrtq_postproc, v->bitrtq_postproc,
               v->s.loop_filter, v->chromaformat, v->broadcast, v->interlace,
               v->tfcntrflag, v->finterpflag
               );

    v->psf = get_bits1(gb);
    if(v->psf) { //PsF, 6.1.13
        av_log(v->s.avctx, AV_LOG_ERROR, "Progressive Segmented Frame mode: not supported (yet)\n");
        return -1;
    }
    if(get_bits1(gb)) { //Display Info - decoding is not affected by it
        int w, h, ar = 0;
        av_log(v->s.avctx, AV_LOG_INFO, "Display extended info:\n");
        w = get_bits(gb, 14) + 1;
        h = get_bits(gb, 14) + 1;
        av_log(v->s.avctx, AV_LOG_INFO, "Display dimensions: %ix%i\n", w, h);
        //TODO: store aspect ratio in AVCodecContext
        if(get_bits1(gb))
            ar = get_bits(gb, 4);
        if(ar == 15) {
            w = get_bits(gb, 8);
            h = get_bits(gb, 8);
        }

        if(get_bits1(gb)){ //framerate stuff
            if(get_bits1(gb)) {
                get_bits(gb, 16);
            } else {
                get_bits(gb, 8);
                get_bits(gb, 4);
            }
        }

        if(get_bits1(gb)){
            v->color_prim = get_bits(gb, 8);
            v->transfer_char = get_bits(gb, 8);
            v->matrix_coef = get_bits(gb, 8);
        }
    }

    v->hrd_param_flag = get_bits1(gb);
    if(v->hrd_param_flag) {
        int i;
        v->hrd_num_leaky_buckets = get_bits(gb, 5);
        get_bits(gb, 4); //bitrate exponent
        get_bits(gb, 4); //buffer size exponent
        for(i = 0; i < v->hrd_num_leaky_buckets; i++) {
            get_bits(gb, 16); //hrd_rate[n]
            get_bits(gb, 16); //hrd_buffer[n]
        }
    }
    return 0;
}

static int decode_entry_point(AVCodecContext *avctx, GetBitContext *gb)
{
    VC1Context *v = avctx->priv_data;
    int i, blink, refdist;

    av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));
    blink = get_bits1(gb); // broken link
    avctx->max_b_frames = 1 - get_bits1(gb); // 'closed entry' also signalize possible B-frames
    v->panscanflag = get_bits1(gb);
    refdist = get_bits1(gb); // refdist flag
    v->s.loop_filter = get_bits1(gb);
    v->fastuvmc = get_bits1(gb);
    v->extended_mv = get_bits1(gb);
    v->dquant = get_bits(gb, 2);
    v->vstransform = get_bits1(gb);
    v->overlap = get_bits1(gb);
    v->quantizer_mode = get_bits(gb, 2);

    if(v->hrd_param_flag){
        for(i = 0; i < v->hrd_num_leaky_buckets; i++) {
            get_bits(gb, 8); //hrd_full[n]
        }
    }

    if(get_bits1(gb)){
        avctx->coded_width = (get_bits(gb, 12)+1)<<1;
        avctx->coded_height = (get_bits(gb, 12)+1)<<1;
    }
    if(v->extended_mv)
        v->extended_dmv = get_bits1(gb);
    if(get_bits1(gb)) {
        av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");
        skip_bits(gb, 3); // Y range, ignored for now
    }
    if(get_bits1(gb)) {
        av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");
        skip_bits(gb, 3); // UV range, ignored for now
    }

    av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"
        "BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"
        "RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"
        "DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",
        blink, 1 - avctx->max_b_frames, v->panscanflag, refdist, v->s.loop_filter,
        v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);

    return 0;
}

static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
{
    int pqindex, lowquant, status;

    if(v->finterpflag) v->interpfrm = get_bits(gb, 1);
    skip_bits(gb, 2); //framecnt unused
    v->rangeredfrm = 0;
    if (v->rangered) v->rangeredfrm = get_bits(gb, 1);
    v->s.pict_type = get_bits(gb, 1);
    if (v->s.avctx->max_b_frames) {
        if (!v->s.pict_type) {
            if (get_bits(gb, 1)) v->s.pict_type = I_TYPE;
            else v->s.pict_type = B_TYPE;
        } else v->s.pict_type = P_TYPE;
    } else v->s.pict_type = v->s.pict_type ? P_TYPE : I_TYPE;

    v->bi_type = 0;
    if(v->s.pict_type == B_TYPE) {
        v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
        v->bfraction = vc1_bfraction_lut[v->bfraction];
        if(v->bfraction == 0) {
            v->s.pict_type = BI_TYPE;
        }
    }
    if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
        get_bits(gb, 7); // skip buffer fullness

    /* calculate RND */
    if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
        v->rnd = 1;
    if(v->s.pict_type == P_TYPE)
        v->rnd ^= 1;

    /* Quantizer stuff */
    pqindex = get_bits(gb, 5);
    if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
        v->pq = pquant_table[0][pqindex];
    else
        v->pq = 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_bits(gb, 1);
    else v->halfpq = 0;
    if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
        v->pquantizer = get_bits(gb, 1);
    v->dquantfrm = 0;
    if (v->extended_mv == 1) v->mvrange = get_prefix(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->profile == PROFILE_ADVANCED)
    {
        if (v->postprocflag) v->postproc = get_bits(gb, 1);
    }
    else
        if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);

//av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",
//        (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);

    if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;

    switch(v->s.pict_type) {
    case P_TYPE:
        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 = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];
        if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
        {
            int scale, shift, i;
            v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];
            v->lumscale = get_bits(gb, 6);
            v->lumshift = get_bits(gb, 6);
            v->use_ic = 1;
            /* fill lookup tables for intensity compensation */
            if(!v->lumscale) {
                scale = -64;
                shift = (255 - v->lumshift * 2) << 6;
                if(v->lumshift > 31)
                    shift += 128 << 6;
            } else {
                scale = v->lumscale + 32;
                if(v->lumshift > 31)
                    shift = (v->lumshift - 64) << 6;
                else
                    shift = v->lumshift << 6;
            }
            for(i = 0; i < 256; i++) {
                v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);
                v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);
            }
        }
        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 vc1_ tables
        v->cbpcy_vlc = &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_bits(gb, 1);
            if (v->ttmbf)
            {
                v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];
            }
        } else {
            v->ttmbf = 1;
            v->ttfrm = TT_8X8;
        }
        break;
    case B_TYPE:
        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 = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
        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 = &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_bits(gb, 1);
            if (v->ttmbf)
            {
                v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];
            }
        } else {
            v->ttmbf = 1;
            v->ttfrm = TT_8X8;
        }
        break;
    }

    /* AC Syntax */
    v->c_ac_table_index = decode012(gb);
    if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
    {
        v->y_ac_table_index = decode012(gb);
    }
    /* DC Syntax */
    v->s.dc_table_index = get_bits(gb, 1);

    if(v->s.pict_type == BI_TYPE) {
        v->s.pict_type = B_TYPE;
        v->bi_type = 1;
    }
    return 0;
}

static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
{
    int fcm;
    int pqindex, lowquant;
    int status;

    v->p_frame_skipped = 0;

    if(v->interlace)
        fcm = decode012(gb);
    switch(get_prefix(gb, 0, 4)) {
    case 0:
        v->s.pict_type = P_TYPE;
        break;
    case 1:
        v->s.pict_type = B_TYPE;
        break;
    case 2:
        v->s.pict_type = I_TYPE;
        break;
    case 3:
        v->s.pict_type = BI_TYPE;
        break;
    case 4:
        v->s.pict_type = P_TYPE; // skipped pic
        v->p_frame_skipped = 1;
        return 0;
    }
    if(v->tfcntrflag)
        get_bits(gb, 8);
    if(v->broadcast) {
        if(!v->interlace || v->panscanflag) {
            get_bits(gb, 2);
        } else {
            get_bits1(gb);
            get_bits1(gb);
        }
    }
    if(v->panscanflag) {
        //...
    }
    v->rnd = get_bits1(gb);
    if(v->interlace)
        v->uvsamp = get_bits1(gb);
    if(v->finterpflag) v->interpfrm = get_bits(gb, 1);
    if(v->s.pict_type == B_TYPE) {
        v->bfraction = get_vlc2(gb, vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
        v->bfraction = vc1_bfraction_lut[v->bfraction];
        if(v->bfraction == 0) {
            v->s.pict_type = BI_TYPE; /* XXX: should not happen here */
        }
    }
    pqindex = get_bits(gb, 5);
    v->pqindex = pqindex;
    if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
        v->pq = pquant_table[0][pqindex];
    else
        v->pq = 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_bits(gb, 1);
    else v->halfpq = 0;
    if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
        v->pquantizer = get_bits(gb, 1);

    switch(v->s.pict_type) {
    case I_TYPE:
    case BI_TYPE:
        status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);
        if (status < 0) return -1;
        av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "
                "Imode: %i, Invert: %i\n", status>>1, status&1);
        v->condover = CONDOVER_NONE;
        if(v->overlap && v->pq <= 8) {
            v->condover = decode012(gb);
            if(v->condover == CONDOVER_SELECT) {
                status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);
                if (status < 0) return -1;
                av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "
                        "Imode: %i, Invert: %i\n", status>>1, status&1);
            }
        }
        break;
    case P_TYPE:
        if(v->postprocflag)
            v->postproc = get_bits1(gb);
        if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);
        else v->mvrange = 0;
        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->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 = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];
        if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
        {
            int scale, shift, i;
            v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];
            v->lumscale = get_bits(gb, 6);
            v->lumshift = get_bits(gb, 6);
            /* fill lookup tables for intensity compensation */
            if(!v->lumscale) {
                scale = -64;
                shift = (255 - v->lumshift * 2) << 6;
                if(v->lumshift > 31)
                    shift += 128 << 6;
            } else {
                scale = v->lumscale + 32;
                if(v->lumshift > 31)
                    shift = (v->lumshift - 64) << 6;
                else
                    shift = v->lumshift << 6;
            }
            for(i = 0; i < 256; i++) {
                v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);
                v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);
            }
        }
        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 vc1_ tables
        v->cbpcy_vlc = &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_bits(gb, 1);
            if (v->ttmbf)
            {
                v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];
            }
        } else {
            v->ttmbf = 1;
            v->ttfrm = TT_8X8;
        }
        break;
    case B_TYPE:
        if(v->postprocflag)
            v->postproc = get_bits1(gb);
        if (v->extended_mv) v->mvrange = get_prefix(gb, 0, 3);
        else v->mvrange = 0;
        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->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 = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
        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 = &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_bits(gb, 1);
            if (v->ttmbf)
            {
                v->ttfrm = ttfrm_to_tt[get_bits(gb, 2)];
            }
        } else {
            v->ttmbf = 1;
            v->ttfrm = TT_8X8;
        }
        break;
    }

    /* AC Syntax */
    v->c_ac_table_index = decode012(gb);
    if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
    {
        v->y_ac_table_index = decode012(gb);
    }
    /* DC Syntax */
    v->s.dc_table_index = get_bits(gb, 1);
    if (v->s.pict_type == I_TYPE && v->dquant) {
        av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
        vop_dquant_decoding(v);
    }

    v->bi_type = 0;
    if(v->s.pict_type == BI_TYPE) {
        v->s.pict_type = B_TYPE;
        v->bi_type = 1;
    }
    return 0;
}

/***********************************************************************/
/**
 * @defgroup block VC-1 Block-level functions
 * @see 7.1.4, p91 and 8.1.1.7, p(1)04
 * @{
 */

/**
 * @def GET_MQUANT
 * @brief Get macroblock-level quantizer scale
 */
#define GET_MQUANT()                                           \
  if (v->dquantfrm)                                            \
  {                                                            \
    int edges = 0;                                             \
    if (v->dqprofile == DQPROFILE_ALL_MBS)                     \
    {                                                          \
      if (v->dqbilevel)                                        \
      {                                                        \
        mquant = (get_bits(gb, 1)) ? v->altpq : v->pq;         \
      }                                                        \
      else                                                     \
      {                                                        \
        mqdiff = get_bits(gb, 3);                              \
        if (mqdiff != 7) mquant = v->pq + mqdiff;              \
        else mquant = get_bits(gb, 5);                         \
      }                                                        \
    }                                                          \
    if(v->dqprofile == DQPROFILE_SINGLE_EDGE)                  \
        edges = 1 << v->dqsbedge;                              \
    else if(v->dqprofile == DQPROFILE_DOUBLE_EDGES)            \
        edges = (3 << v->dqsbedge) % 15;                       \
    else if(v->dqprofile == DQPROFILE_FOUR_EDGES)              \
        edges = 15;                                            \
    if((edges&1) && !s->mb_x)                                  \
        mquant = v->altpq;                                     \
    if((edges&2) && s->first_slice_line)                       \
        mquant = v->altpq;                                     \
    if((edges&4) && s->mb_x == (s->mb_width - 1))              \
        mquant = v->altpq;                                     \
    if((edges&8) && s->mb_y == (s->mb_height - 1))             \
        mquant = v->altpq;                                     \
  }

/**
 * @def GET_MVDATA(_dmv_x, _dmv_y)
 * @brief Get MV differentials
 * @see MVDATA decoding from 8.3.5.2, p(1)20
 * @param _dmv_x Horizontal differential for decoded MV
 * @param _dmv_y Vertical differential for decoded MV
 */
#define GET_MVDATA(_dmv_x, _dmv_y)                                  \
  index = 1 + get_vlc2(gb, vc1_mv_diff_vlc[s->mv_table_index].table,\
                       VC1_MV_DIFF_VLC_BITS, 2);                    \
  if (index > 36)                                                   \
  {                                                                 \
    mb_has_coeffs = 1;                                              \
    index -= 37;                                                    \
  }                                                                 \
  else mb_has_coeffs = 0;                                           \
  s->mb_intra = 0;                                                  \
  if (!index) { _dmv_x = _dmv_y = 0; }                              \
  else if (index == 35)                                             \
  {                                                                 \
    _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \
    _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \
  }                                                                 \
  else if (index == 36)                                             \
  {                                                                 \
    _dmv_x = 0;                                                     \
    _dmv_y = 0;                                                     \
    s->mb_intra = 1;                                                \
  }                                                                 \
  else                                                              \
  {                                                                 \
    index1 = index%6;                                               \
    if (!s->quarter_sample && index1 == 5) val = 1;                 \
    else                                   val = 0;                 \
    if(size_table[index1] - val > 0)                                \
        val = get_bits(gb, size_table[index1] - val);               \
    else                                   val = 0;                 \
    sign = 0 - (val&1);                                             \
    _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \
                                                                    \
    index1 = index/6;                                               \
    if (!s->quarter_sample && index1 == 5) val = 1;                 \
    else                                   val = 0;                 \
    if(size_table[index1] - val > 0)                                \
        val = get_bits(gb, size_table[index1] - val);               \
    else                                   val = 0;                 \
    sign = 0 - (val&1);                                             \
    _dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \
  }

/** Predict and set motion vector
 */
static inline void vc1_pred_mv(MpegEncContext *s, int n, int dmv_x, int dmv_y, int mv1, int r_x, int r_y, uint8_t* is_intra)
{
    int xy, wrap, off = 0;
    int16_t *A, *B, *C;
    int px, py;
    int sum;

    /* scale MV difference to be quad-pel */
    dmv_x <<= 1 - s->quarter_sample;
    dmv_y <<= 1 - s->quarter_sample;

    wrap = s->b8_stride;
    xy = s->block_index[n];

    if(s->mb_intra){
        s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;
        s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;
        if(mv1) { /* duplicate motion data for 1-MV block */
            s->current_picture.motion_val[0][xy + 1][0] = 0;
            s->current_picture.motion_val[0][xy + 1][1] = 0;
            s->current_picture.motion_val[0][xy + wrap][0] = 0;
            s->current_picture.motion_val[0][xy + wrap][1] = 0;
            s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;
            s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;
        }
        return;
    }

    C = s->current_picture.motion_val[0][xy - 1];
    A = s->current_picture.motion_val[0][xy - wrap];
    if(mv1)
        off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;
    else {
        //in 4-MV mode different blocks have different B predictor position
        switch(n){
        case 0:
            off = (s->mb_x > 0) ? -1 : 1;
            break;
        case 1:
            off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;
            break;
        case 2:
            off = 1;
            break;
        case 3:
            off = -1;
        }
    }
    B = s->current_picture.motion_val[0][xy - wrap + off];

    if(!s->first_slice_line || (n==2 || n==3)) { // predictor A is not out of bounds
        if(s->mb_width == 1) {
            px = A[0];
            py = A[1];
        } else {
            px = mid_pred(A[0], B[0], C[0]);
            py = mid_pred(A[1], B[1], C[1]);