default:            fprintf( stderr, "internal error or slice unsupported\n" );            return;    }    /* Write:      - type      - prediction      - mv */    if( mb->i_type == I_PCM )    {        /* Untested */        bs_write_ue( s, i_mb_i_offset + 25 );        bs_align_0( s );        /* Luma */        for( i = 0; i < 16*16; i++ )        {            bs_write( s, 8, h->picture->plane[0][mb->i_mb_y * 16 * h->picture->i_stride[0] + mb->i_mb_x * 16+i] );        }        /* Cb */        for( i = 0; i < 8*8; i++ )        {            bs_write( s, 8, h->picture->plane[1][mb->i_mb_y * 8 * h->picture->i_stride[1] + mb->i_mb_x * 8+i] );        }        /* Cr */        for( i = 0; i < 8*8; i++ )        {            bs_write( s, 8, h->picture->plane[2][mb->i_mb_y * 8 * h->picture->i_stride[2] + mb->i_mb_x * 8+i] );        }        for( i = 0; i < 16 + 8; i++ )        {            /* special case */            mb->block[i].i_non_zero_count = 16;        }        return;    }    else if( mb->i_type == I_4x4 )    {        bs_write_ue( s, i_mb_i_offset + 0 );        /* Prediction: Luma */        for( i = 0; i < 16; i++ )        {            int i_predicted_mode = x264_mb_predict_intra4x4_mode( h, mb, i );            int i_mode = mb->block[i].i_intra4x4_pred_mode;            if( i_predicted_mode == i_mode)            {                bs_write1( s, 1 );  /* b_prev_intra4x4_pred_mode */            }            else            {                bs_write1( s, 0 );  /* b_prev_intra4x4_pred_mode */                if( i_mode < i_predicted_mode )                {                    bs_write( s, 3, i_mode );                }                else                {                    bs_write( s, 3, i_mode - 1 );                }            }        }        /* Prediction: chroma */        bs_write_ue( s, mb->i_chroma_pred_mode );    }    else if( mb->i_type == I_16x16 )    {        bs_write_ue( s, i_mb_i_offset + 1 + mb->i_intra16x16_pred_mode +                                            mb->i_cbp_chroma * 4 +                                            ( mb->i_cbp_luma == 0 ? 0 : 12 ) );        /* Prediction: chroma */        bs_write_ue( s, mb->i_chroma_pred_mode );    }    else if( mb->i_type == P_L0 )    {        int mvp[2];        if( mb->i_partition == D_16x16 )        {            bs_write_ue( s, 0 );            if( h->sh.i_num_ref_idx_l0_active > 1 )            {                bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, mb->partition[0][0].i_ref[0] );            }            x264_mb_predict_mv( mb, 0, 0, 0, mvp );            bs_write_se( s, mb->partition[0][0].mv[0][0] - mvp[0] );            bs_write_se( s, mb->partition[0][0].mv[0][1] - mvp[1] );        }        else if( mb->i_partition == D_16x8 )        {            bs_write_ue( s, 1 );            if( h->sh.i_num_ref_idx_l0_active > 1 )            {                bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, mb->partition[0][0].i_ref[0] );                bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, mb->partition[0][2].i_ref[0] );            }            x264_mb_predict_mv( mb, 0, 0, 0, mvp );            bs_write_se( s, mb->partition[0][0].mv[0][0] - mvp[0] );            bs_write_se( s, mb->partition[0][0].mv[0][1] - mvp[1] );            x264_mb_predict_mv( mb, 0, 1, 0, mvp );            bs_write_se( s, mb->partition[0][2].mv[0][0] - mvp[0] );            bs_write_se( s, mb->partition[0][2].mv[0][1] - mvp[1] );        }        else if( mb->i_partition == D_8x16 )        {            bs_write_ue( s, 2 );            if( h->sh.i_num_ref_idx_l0_active > 1 )            {                bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, mb->partition[0][0].i_ref[0] );                bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, mb->partition[2][0].i_ref[0] );            }            x264_mb_predict_mv( mb, 0, 0, 0, mvp );            bs_write_se( s, mb->partition[0][0].mv[0][0] - mvp[0] );            bs_write_se( s, mb->partition[0][0].mv[0][1] - mvp[1] );            x264_mb_predict_mv( mb, 0, 1, 0, mvp );            bs_write_se( s, mb->partition[2][0].mv[0][0] - mvp[0] );            bs_write_se( s, mb->partition[2][0].mv[0][1] - mvp[1] );        }    }    else if( mb->i_type == P_8x8 )    {        int b_sub_ref0;        if( mb->partition[0][0].i_ref[0] == 0 &&            mb->partition[0][2].i_ref[0] == 0 &&            mb->partition[2][0].i_ref[0] == 0 &&            mb->partition[2][2].i_ref[0] == 0 )        {            bs_write_ue( s, 4 );            b_sub_ref0 = 0;        }        else        {            bs_write_ue( s, 3 );            b_sub_ref0 = 1;        }        /* sub mb type */        for( i = 0; i < 4; i++ )        {            switch( mb->i_sub_partition[i] )            {                case D_L0_8x8:                    bs_write_ue( s, 0 );                    break;                case D_L0_8x4:                    bs_write_ue( s, 1 );                    break;                case D_L0_4x8:                    bs_write_ue( s, 2 );                    break;                case D_L0_4x4:                    bs_write_ue( s, 3 );                    break;            }        }        /* ref0 */        if( h->sh.i_num_ref_idx_l0_active > 1 && b_sub_ref0 )        {            bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, mb->partition[0][0].i_ref[0] );            bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, mb->partition[2][0].i_ref[0] );            bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, mb->partition[0][2].i_ref[0] );            bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, mb->partition[2][2].i_ref[0] );        }        for( i = 0; i < 4; i++ )        {            int i_part;            for( i_part = 0; i_part < x264_mb_partition_count_table[mb->i_sub_partition[i]]; i_part++ )            {                int mvx, mvy;                int mvp[2];                x264_mb_partition_get( mb, 0, i, i_part, NULL, &mvx, &mvy );                x264_mb_predict_mv( mb, 0, i, i_part, mvp );                bs_write_se( s, mvx - mvp[0] );                bs_write_se( s, mvy - mvp[1]);            }        }    }    else if( mb->i_type == B_8x8 )    {        fprintf( stderr, "invalid/unhandled mb_type (B_8x8)\n" );        return;    }    else if( mb->i_type != B_DIRECT )    {        /* All B mode */        /* Motion Vector */        int i_part = x264_mb_partition_count_table[mb->i_partition];        int i_ref;        int mvx, mvy;        int mvp[2];        int b_list0[2];        int b_list1[2];        /* init ref list utilisations */        for( i = 0; i < 2; i++ )        {            b_list0[i] = x264_mb_type_list0_table[mb->i_type][i];            b_list1[i] = x264_mb_type_list1_table[mb->i_type][i];        }        if( mb->i_partition == D_16x16 )        {            if( b_list0[0] && b_list1[0] )            {                bs_write_ue( s, 3 );            }            else if( b_list1[0] )            {                bs_write_ue( s, 2 );            }            else            {                bs_write_ue( s, 1 );            }        }        else        {            if( mb->i_type == B_BI_BI )            {                bs_write_ue( s, 20 + (mb->i_partition == D_16x8 ? 0 : 1 ) );            }            else if( b_list0[0] && b_list1[0] )            {                /* B_BI_LX* */                bs_write_ue( s, 16 + (b_list0[1]?0:2) + (mb->i_partition == D_16x8?0:1) );            }            else if( b_list0[1] && b_list1[1] )            {                /* B_LX_BI */                bs_write_ue( s, 12 + (b_list0[1]?0:2) + (mb->i_partition == D_16x8?0:1) );            }            else if( b_list1[1] )            {                /* B_LX_L1 */                bs_write_ue( s, 6 + (b_list0[0]?2:0) + (mb->i_partition == D_16x8?0:1) );            }            else if( b_list0[1] )            {                /* B_LX_L0 */                bs_write_ue( s, 4 + (b_list0[0]?0:6) + (mb->i_partition == D_16x8?0:1) );            }        }        if( h->sh.i_num_ref_idx_l0_active > 1 )        {            for( i = 0; i < i_part; i++ )            {                if( b_list0[i] )                {                    x264_mb_partition_get( mb, 0, i, 0, &i_ref, NULL, NULL );                    bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, i_ref );                }            }        }        if( h->sh.i_num_ref_idx_l1_active > 1 )        {            for( i = 0; i < i_part; i++ )            {                if( b_list1[i] )                {                    x264_mb_partition_get( mb, 1, i, 0, &i_ref, NULL, NULL );                    bs_write_te( s, h->sh.i_num_ref_idx_l1_active - 1, i_ref );                }            }        }        for( i = 0; i < i_part; i++ )        {            if( b_list0[i] )            {                x264_mb_partition_get( mb, 0, i, 0, NULL, &mvx, &mvy );                x264_mb_predict_mv( mb, 0, i, 0, mvp );                bs_write_se( s, mvx - mvp[0] );                bs_write_se( s, mvy - mvp[1] );            }        }        for( i = 0; i < i_part; i++ )        {            if( b_list1[i] )            {                x264_mb_partition_get( mb, 1, i, 0, NULL, &mvx, &mvy );                x264_mb_predict_mv( mb, 1, i, 0, mvp );                bs_write_se( s, mvx - mvp[0] );                bs_write_se( s, mvy - mvp[1] );            }        }    }    else if( mb->i_type == B_DIRECT )    {        bs_write_ue( s, 0 );    }    else    {        fprintf( stderr, "invalid/unhandled mb_type\n" );        return;    }    /* Coded block patern */    if( mb->i_type == I_4x4 )    {        bs_write_ue( s, intra4x4_cbp_to_golomb[( mb->i_cbp_chroma << 4 )|mb->i_cbp_luma] );    }    else if( mb->i_type != I_16x16 )    {        bs_write_ue( s, inter_cbp_to_golomb[( mb->i_cbp_chroma << 4 )|mb->i_cbp_luma] );    }    /* write residual */    if( mb->i_type == I_16x16 )    {        if( mb->i_mb_x > 0 || mb->i_mb_y > 0 )            bs_write_se( s, mb->i_qp - (mb-1)->i_qp);        else            bs_write_se( s, mb->i_qp - h->pps->i_pic_init_qp - h->sh.i_qp_delta );        /* DC Luma */        block_residual_write_cavlc( h, s, mb, BLOCK_INDEX_LUMA_DC , mb->luma16x16_dc, 16 );        if( mb->i_cbp_luma != 0 )        {            /* AC Luma */            for( i = 0; i < 16; i++ )            {                block_residual_write_cavlc( h, s, mb, i, mb->block[i].residual_ac, 15 );            }        }    }    else if( mb->i_cbp_luma != 0 || mb->i_cbp_chroma != 0 )    {        bs_write_se( s, mb->i_qp - h->pps->i_pic_init_qp - h->sh.i_qp_delta );        for( i = 0; i < 16; i++ )        {            if( mb->i_cbp_luma & ( 1 << ( i / 4 ) ) )            {                block_residual_write_cavlc( h, s, mb, i, mb->block[i].luma4x4, 16 );            }        }    }    if( mb->i_cbp_chroma != 0 )    {        /* Chroma DC residual present */        block_residual_write_cavlc( h, s, mb, BLOCK_INDEX_CHROMA_DC, mb->chroma_dc[0], 4 );        block_residual_write_cavlc( h, s, mb, BLOCK_INDEX_CHROMA_DC, mb->chroma_dc[1], 4 );        if( mb->i_cbp_chroma&0x02 ) /* Chroma AC residual present */        {            for( i = 0; i < 8; i++ )            {                block_residual_write_cavlc( h, s, mb, 16 + i, mb->block[16+i].residual_ac, 15 );            }        }    }}/***************************************************************************** * * Cabac stuff * *****************************************************************************/static void x264_cabac_mb_type( x264_t *h, x264_macroblock_t *mb ){    x264_macroblock_t *mba = mb->context->mba;    x264_macroblock_t *mbb = mb->context->mbb;    int i_ctxIdxInc    = 0;    if( h->sh.i_type == SLICE_TYPE_I )    {        if( mba != NULL && mba->i_type != I_4x4 )        {            i_ctxIdxInc++;        }        if( mbb != NULL && mbb->i_type != I_4x4 )        {            i_ctxIdxInc++;        }        if( mb->i_type == I_4x4 )        {            x264_cabac_encode_decision( &h->cabac, 3 + i_ctxIdxInc, 0 );        }        else if( mb->i_type == I_PCM )        {            x264_cabac_encode_decision( &h->cabac, 3 + i_ctxIdxInc, 1 );            x264_cabac_encode_terminal( &h->cabac, 1 ); /*ctxIdx == 276 */        }        else    /* I_16x16 */        {            x264_cabac_encode_decision( &h->cabac, 3 + i_ctxIdxInc, 1 );            x264_cabac_encode_terminal( &h->cabac, 0 ); /*ctxIdx == 276 */            x264_cabac_encode_decision( &h->cabac, 3 + 3, ( mb->i_cbp_luma == 0 ? 0 : 1 ));            if( mb->i_cbp_chroma == 0 )            {                x264_cabac_encode_decision( &h->cabac, 3 + 4, 0 );            }            else            {                x264_cabac_encode_decision( &h->cabac, 3 + 4, 1 );                x264_cabac_encode_decision( &h->cabac, 3 + 5, ( mb->i_cbp_chroma == 1 ? 0 : 1 ) );            }            x264_cabac_encode_decision( &h->cabac, 3 + 6, ( (mb->i_intra16x16_pred_mode / 2) ? 1 : 0 ));            x264_cabac_encode_decision( &h->cabac, 3 + 7, ( (mb->i_intra16x16_pred_mode % 2) ? 1 : 0 ));        }    }    else if( h->sh.i_type == SLICE_TYPE_P )    {        /* prefix: 14, suffix: 17 */        if( mb->i_type == P_L0 )        {            if( mb->i_partition == D_16x16 )            {                x264_cabac_encode_decision( &h->cabac, 14, 0 );                x264_cabac_encode_decision( &h->cabac, 15, 0 );                x264_cabac_encode_decision( &h->cabac, 16, 0 );            }            else if( mb->i_partition == D_16x8 )            {                x264_cabac_encode_decision( &h->cabac, 14, 0 );                x264_cabac_encode_decision( &h->cabac, 15, 1 );