+/** Decode one B-frame MB (in interlaced frame B picture)
+ */
+static int vc1_decode_b_mb_intfr(VC1Context *v)
+{
+ MpegEncContext *s = &v->s;
+ GetBitContext *gb = &s->gb;
+ int i, j;
+ int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
+ int cbp = 0; /* cbp decoding stuff */
+ int mqdiff, mquant; /* MB quantization */
+ int ttmb = v->ttfrm; /* MB Transform type */
+ int mvsw = 0; /* motion vector switch */
+ int mb_has_coeffs = 1; /* last_flag */
+ int dmv_x, dmv_y; /* Differential MV components */
+ int val; /* temp value */
+ int first_block = 1;
+ int dst_idx, off;
+ int skipped, direct, twomv = 0;
+ int block_cbp = 0, pat, block_tt = 0;
+ int idx_mbmode = 0, mvbp;
+ int stride_y, fieldtx;
+ int bmvtype = BMV_TYPE_BACKWARD;
+ int dir, dir2;
+
+ mquant = v->pq; /* Lossy initialization */
+ s->mb_intra = 0;
+ if (v->skip_is_raw)
+ skipped = get_bits1(gb);
+ else
+ skipped = v->s.mbskip_table[mb_pos];
+
+ if (!skipped) {
+ idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2);
+ if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {
+ twomv = 1;
+ v->blk_mv_type[s->block_index[0]] = 1;
+ v->blk_mv_type[s->block_index[1]] = 1;
+ v->blk_mv_type[s->block_index[2]] = 1;
+ v->blk_mv_type[s->block_index[3]] = 1;
+ } else {
+ v->blk_mv_type[s->block_index[0]] = 0;
+ v->blk_mv_type[s->block_index[1]] = 0;
+ v->blk_mv_type[s->block_index[2]] = 0;
+ v->blk_mv_type[s->block_index[3]] = 0;
+ }
+ }
+
+ if (v->dmb_is_raw)
+ direct = get_bits1(gb);
+ else
+ direct = v->direct_mb_plane[mb_pos];
+
+ if (direct) {
+ s->mv[0][0][0] = s->current_picture.motion_val[0][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 0, s->quarter_sample);
+ s->mv[0][0][1] = s->current_picture.motion_val[0][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 0, s->quarter_sample);
+ s->mv[1][0][0] = s->current_picture.motion_val[1][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 1, s->quarter_sample);
+ s->mv[1][0][1] = s->current_picture.motion_val[1][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 1, s->quarter_sample);
+
+ if (twomv) {
+ s->mv[0][2][0] = s->current_picture.motion_val[0][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 0, s->quarter_sample);
+ s->mv[0][2][1] = s->current_picture.motion_val[0][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 0, s->quarter_sample);
+ s->mv[1][2][0] = s->current_picture.motion_val[1][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 1, s->quarter_sample);
+ s->mv[1][2][1] = s->current_picture.motion_val[1][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 1, s->quarter_sample);
+
+ for (i = 1; i < 4; i += 2) {
+ s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];
+ s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];
+ s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];
+ s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];
+ }
+ } else {
+ for (i = 1; i < 4; i++) {
+ s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];
+ s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];
+ s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];
+ s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];
+ }
+ }
+ }
+
+ if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB
+ for (i = 0; i < 4; i++) {
+ s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;
+ s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = 0;
+ s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = 0;
+ s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = 0;
+ }
+ s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;
+ s->mb_intra = v->is_intra[s->mb_x] = 1;
+ for (i = 0; i < 6; i++)
+ v->mb_type[0][s->block_index[i]] = 1;
+ fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);
+ mb_has_coeffs = get_bits1(gb);
+ if (mb_has_coeffs)
+ cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
+ v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);
+ GET_MQUANT();
+ s->current_picture.qscale_table[mb_pos] = mquant;
+ /* Set DC scale - y and c use the same (not sure if necessary here) */
+ s->y_dc_scale = s->y_dc_scale_table[mquant];
+ s->c_dc_scale = s->c_dc_scale_table[mquant];
+ dst_idx = 0;
+ for (i = 0; i < 6; i++) {
+ s->dc_val[0][s->block_index[i]] = 0;
+ dst_idx += i >> 2;
+ val = ((cbp >> (5 - i)) & 1);
+ v->mb_type[0][s->block_index[i]] = s->mb_intra;
+ v->a_avail = v->c_avail = 0;
+ if (i == 2 || i == 3 || !s->first_slice_line)
+ v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
+ if (i == 1 || i == 3 || s->mb_x)
+ v->c_avail = v->mb_type[0][s->block_index[i] - 1];
+
+ vc1_decode_intra_block(v, s->block[i], i, val, mquant,
+ (i & 4) ? v->codingset2 : v->codingset);
+ if (i > 3 && (s->flags & CODEC_FLAG_GRAY))
+ continue;
+ v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
+ if (i < 4) {
+ stride_y = s->linesize << fieldtx;
+ off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;
+ } else {
+ stride_y = s->uvlinesize;
+ off = 0;
+ }
+ s->idsp.put_signed_pixels_clamped(s->block[i],
+ s->dest[dst_idx] + off,
+ stride_y);
+ }
+ } else {
+ s->mb_intra = v->is_intra[s->mb_x] = 0;
+ if (!direct) {
+ if (skipped || !s->mb_intra) {
+ bmvtype = decode012(gb);
+ switch (bmvtype) {
+ case 0:
+ bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;
+ break;
+ case 1:
+ bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;
+ break;
+ case 2:
+ bmvtype = BMV_TYPE_INTERPOLATED;
+ }
+ }
+
+ if (twomv && bmvtype != BMV_TYPE_INTERPOLATED)
+ mvsw = get_bits1(gb);
+ }
+
+ if (!skipped) { // inter MB
+ mb_has_coeffs = ff_vc1_mbmode_intfrp[0][idx_mbmode][3];
+ if (mb_has_coeffs)
+ cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
+ if (!direct) {
+ if (bmvtype == BMV_TYPE_INTERPOLATED & twomv) {
+ v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
+ } else if (bmvtype == BMV_TYPE_INTERPOLATED | twomv) {
+ v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);
+ }
+ }
+
+ for (i = 0; i < 6; i++)
+ v->mb_type[0][s->block_index[i]] = 0;
+ fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[0][idx_mbmode][1];
+ /* for all motion vector read MVDATA and motion compensate each block */
+ dst_idx = 0;
+ if (direct) {
+ if (twomv) {
+ for (i = 0; i < 4; i++) {
+ vc1_mc_4mv_luma(v, i, 0, 0);
+ vc1_mc_4mv_luma(v, i, 1, 1);
+ }
+ vc1_mc_4mv_chroma4(v, 0, 0, 0);
+ vc1_mc_4mv_chroma4(v, 1, 1, 1);
+ } else {
+ vc1_mc_1mv(v, 0);
+ vc1_interp_mc(v);
+ }
+ } else if (twomv && bmvtype == BMV_TYPE_INTERPOLATED) {
+ mvbp = v->fourmvbp;
+ for (i = 0; i < 4; i++) {
+ dir = i==1 || i==3;
+ dmv_x = dmv_y = 0;
+ val = ((mvbp >> (3 - i)) & 1);
+ if (val)
+ get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+ j = i > 1 ? 2 : 0;
+ vc1_pred_mv_intfr(v, j, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);
+ vc1_mc_4mv_luma(v, j, dir, dir);
+ vc1_mc_4mv_luma(v, j+1, dir, dir);
+ }
+
+ vc1_mc_4mv_chroma4(v, 0, 0, 0);
+ vc1_mc_4mv_chroma4(v, 1, 1, 1);
+ } else if (bmvtype == BMV_TYPE_INTERPOLATED) {
+ mvbp = v->twomvbp;
+ dmv_x = dmv_y = 0;
+ if (mvbp & 2)
+ get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+
+ vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);
+ vc1_mc_1mv(v, 0);
+
+ dmv_x = dmv_y = 0;
+ if (mvbp & 1)
+ get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+
+ vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 1);
+ vc1_interp_mc(v);
+ } else if (twomv) {
+ dir = bmvtype == BMV_TYPE_BACKWARD;
+ dir2 = dir;
+ if (mvsw)
+ dir2 = !dir;
+ mvbp = v->twomvbp;
+ dmv_x = dmv_y = 0;
+ if (mvbp & 2)
+ get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+ vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);
+
+ dmv_x = dmv_y = 0;
+ if (mvbp & 1)
+ get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+ vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir2);
+
+ if (mvsw) {
+ for (i = 0; i < 2; i++) {
+ s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];
+ s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];
+ s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];
+ s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];
+ }
+ } else {
+ vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);
+ vc1_pred_mv_intfr(v, 2, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);
+ }
+
+ vc1_mc_4mv_luma(v, 0, dir, 0);
+ vc1_mc_4mv_luma(v, 1, dir, 0);
+ vc1_mc_4mv_luma(v, 2, dir2, 0);
+ vc1_mc_4mv_luma(v, 3, dir2, 0);
+ vc1_mc_4mv_chroma4(v, dir, dir2, 0);
+ } else {
+ dir = bmvtype == BMV_TYPE_BACKWARD;
+
+ mvbp = ff_vc1_mbmode_intfrp[0][idx_mbmode][2];
+ dmv_x = dmv_y = 0;
+ if (mvbp)
+ get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
+
+ vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], dir);
+ v->blk_mv_type[s->block_index[0]] = 1;
+ v->blk_mv_type[s->block_index[1]] = 1;
+ v->blk_mv_type[s->block_index[2]] = 1;
+ v->blk_mv_type[s->block_index[3]] = 1;
+ vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);
+ for (i = 0; i < 2; i++) {
+ s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];
+ s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];
+ }
+ vc1_mc_1mv(v, dir);
+ }
+
+ if (cbp)
+ GET_MQUANT(); // p. 227
+ s->current_picture.qscale_table[mb_pos] = mquant;
+ if (!v->ttmbf && cbp)
+ ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
+ for (i = 0; i < 6; i++) {
+ s->dc_val[0][s->block_index[i]] = 0;
+ dst_idx += i >> 2;
+ val = ((cbp >> (5 - i)) & 1);
+ if (!fieldtx)
+ off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
+ else
+ off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));
+ if (val) {
+ pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
+ first_block, s->dest[dst_idx] + off,
+ (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),
+ (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);
+ block_cbp |= pat << (i << 2);
+ if (!v->ttmbf && ttmb < 8)
+ ttmb = -1;
+ first_block = 0;
+ }
+ }
+
+ } else { // skipped
+ dir = 0;
+ for (i = 0; i < 6; i++) {
+ v->mb_type[0][s->block_index[i]] = 0;
+ s->dc_val[0][s->block_index[i]] = 0;
+ }
+ s->current_picture.mb_type[mb_pos] = MB_TYPE_SKIP;
+ s->current_picture.qscale_table[mb_pos] = 0;
+ v->blk_mv_type[s->block_index[0]] = 0;
+ v->blk_mv_type[s->block_index[1]] = 0;
+ v->blk_mv_type[s->block_index[2]] = 0;
+ v->blk_mv_type[s->block_index[3]] = 0;
+
+ if (!direct) {
+ if (bmvtype == BMV_TYPE_INTERPOLATED) {
+ vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);
+ vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 1);
+ } else {
+ dir = bmvtype == BMV_TYPE_BACKWARD;
+ vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], dir);
+ if (mvsw) {
+ int dir2 = dir;
+ if (mvsw)
+ dir2 = !dir;
+ for (i = 0; i < 2; i++) {
+ s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];
+ s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];
+ s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];
+ s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];
+ }
+ } else {
+ v->blk_mv_type[s->block_index[0]] = 1;
+ v->blk_mv_type[s->block_index[1]] = 1;
+ v->blk_mv_type[s->block_index[2]] = 1;
+ v->blk_mv_type[s->block_index[3]] = 1;
+ vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);
+ for (i = 0; i < 2; i++) {
+ s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];
+ s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];
+ }
+ }
+ }
+ }
+
+ vc1_mc_1mv(v, dir);
+ if (direct || bmvtype == BMV_TYPE_INTERPOLATED) {
+ vc1_interp_mc(v);
+ }
+ }
+ }
+ if (s->mb_x == s->mb_width - 1)
+ memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);
+ v->cbp[s->mb_x] = block_cbp;
+ v->ttblk[s->mb_x] = block_tt;
+ return 0;
+}
+