cavlc.c.svn-base

这是h.264的测试模型

    switch( h->sh.i_type )
    {
        case SLICE_TYPE_I:
            i_mb_i_offset = 0;
            break;
        case SLICE_TYPE_P:
            i_mb_i_offset = 5;
            break;
        case SLICE_TYPE_B:
            i_mb_i_offset = 23;
            break;
        default:
            x264_log(h, X264_LOG_ERROR, "internal error or slice unsupported\n" );
            return;
    }

    /* Write:
      - type
      - prediction
      - mv */
    if( i_mb_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++ )
        {
            const int x = 16 * h->mb.i_mb_x + (i % 16);
            const int y = 16 * h->mb.i_mb_y + (i / 16);
            bs_write( s, 8, h->fenc->plane[0][y*h->mb.pic.i_stride[0]+x] );
        }
        /* Cb */
        for( i = 0; i < 8*8; i++ )
        {
            const int x = 8 * h->mb.i_mb_x + (i % 8);
            const int y = 8 * h->mb.i_mb_y + (i / 8);
            bs_write( s, 8, h->fenc->plane[1][y*h->mb.pic.i_stride[1]+x] );
        }
        /* Cr */
        for( i = 0; i < 8*8; i++ )
        {
            const int x = 8 * h->mb.i_mb_x + (i % 8);
            const int y = 8 * h->mb.i_mb_y + (i / 8);
            bs_write( s, 8, h->fenc->plane[2][y*h->mb.pic.i_stride[2]+x] );
        }
        return;
    }
    else if( i_mb_type == I_4x4 )
    {
        bs_write_ue( s, i_mb_i_offset + 0 );

        /* Prediction: Luma */
        for( i = 0; i < 16; i++ )
        {
            int i_pred = x264_mb_predict_intra4x4_mode( h, i );
            int i_mode = h->mb.cache.intra4x4_pred_mode[x264_scan8[i]];

            if( i_pred == 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_pred )
                {
                    bs_write( s, 3, i_mode );
                }
                else
                {
                    bs_write( s, 3, i_mode - 1 );
                }
            }
        }
        bs_write_ue( s, h->mb.i_chroma_pred_mode );
    }
    else if( i_mb_type == I_16x16 )
    {
        bs_write_ue( s, i_mb_i_offset + 1 + h->mb.i_intra16x16_pred_mode +
                        h->mb.i_cbp_chroma * 4 + ( h->mb.i_cbp_luma == 0 ? 0 : 12 ) );
        bs_write_ue( s, h->mb.i_chroma_pred_mode );
    }
    else if( i_mb_type == P_L0 )
    {
        int mvp[2];

        if( h->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, h->mb.cache.ref[0][x264_scan8[0]] );
            }
            x264_mb_predict_mv( h, 0, 0, 4, mvp );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[0]][0] - mvp[0] );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[0]][1] - mvp[1] );
        }
        else if( h->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, h->mb.cache.ref[0][x264_scan8[0]] );
                bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, h->mb.cache.ref[0][x264_scan8[8]] );
            }

            x264_mb_predict_mv( h, 0, 0, 4, mvp );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[0]][0] - mvp[0] );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[0]][1] - mvp[1] );

            x264_mb_predict_mv( h, 0, 8, 4, mvp );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[8]][0] - mvp[0] );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[8]][1] - mvp[1] );
        }
        else if( h->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, h->mb.cache.ref[0][x264_scan8[0]] );
                bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, h->mb.cache.ref[0][x264_scan8[4]] );
            }

            x264_mb_predict_mv( h, 0, 0, 2, mvp );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[0]][0] - mvp[0] );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[0]][1] - mvp[1] );

            x264_mb_predict_mv( h, 0, 4, 2, mvp );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[4]][0] - mvp[0] );
            bs_write_se( s, h->mb.cache.mv[0][x264_scan8[4]][1] - mvp[1] );
        }
    }
    else if( i_mb_type == P_8x8 )
    {
        int b_sub_ref0;

        if( h->mb.cache.ref[0][x264_scan8[0]] == 0 && h->mb.cache.ref[0][x264_scan8[4]] == 0 &&
            h->mb.cache.ref[0][x264_scan8[8]] == 0 && h->mb.cache.ref[0][x264_scan8[12]] == 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++ )
        {
            bs_write_ue( s, sub_mb_type_p_to_golomb[ h->mb.i_sub_partition[i] ] );
        }
        /* 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, h->mb.cache.ref[0][x264_scan8[0]] );
            bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, h->mb.cache.ref[0][x264_scan8[4]] );
            bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, h->mb.cache.ref[0][x264_scan8[8]] );
            bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, h->mb.cache.ref[0][x264_scan8[12]] );
        }

        x264_sub_mb_mv_write_cavlc( h, s, 0 );
    }
    else if( i_mb_type == B_8x8 )
    {
        bs_write_ue( s, 22 );

        /* sub mb type */
        for( i = 0; i < 4; i++ )
        {
            bs_write_ue( s, sub_mb_type_b_to_golomb[ h->mb.i_sub_partition[i] ] );
        }
        /* ref */
        for( i = 0; i < 4; i++ )
        {
            if( x264_mb_partition_listX_table[0][ h->mb.i_sub_partition[i] ] )
            {
                bs_write_te( s, h->sh.i_num_ref_idx_l0_active - 1, h->mb.cache.ref[0][x264_scan8[i*4]] );
            }
        }
        for( i = 0; i < 4; i++ )
        {
            if( x264_mb_partition_listX_table[1][ h->mb.i_sub_partition[i] ] )
            {
                bs_write_te( s, h->sh.i_num_ref_idx_l1_active - 1, h->mb.cache.ref[1][x264_scan8[i*4]] );
            }
        }
        /* mvd */
        x264_sub_mb_mv_write_cavlc( h, s, 0 );
        x264_sub_mb_mv_write_cavlc( h, s, 1 );
    }
    else if( i_mb_type != B_DIRECT )
    {
        /* All B mode */
        /* Motion Vector */
        int i_list;
        int mvp[2];

        int b_list[2][2];

        /* init ref list utilisations */
        for( i = 0; i < 2; i++ )
        {
            b_list[0][i] = x264_mb_type_list0_table[i_mb_type][i];
            b_list[1][i] = x264_mb_type_list1_table[i_mb_type][i];
        }


        bs_write_ue( s, mb_type_b_to_golomb[ h->mb.i_partition - D_16x8 ][ i_mb_type - B_L0_L0 ] );

        for( i_list = 0; i_list < 2; i_list++ )
        {
            const int i_ref_max = i_list == 0 ? h->sh.i_num_ref_idx_l0_active : h->sh.i_num_ref_idx_l1_active;

            if( i_ref_max > 1 )
            {
                switch( h->mb.i_partition )
                {
                    case D_16x16:
                        if( b_list[i_list][0] ) bs_write_te( s, i_ref_max - 1, h->mb.cache.ref[i_list][x264_scan8[0]] );
                        break;
                    case D_16x8:
                        if( b_list[i_list][0] ) bs_write_te( s, i_ref_max - 1, h->mb.cache.ref[i_list][x264_scan8[0]] );
                        if( b_list[i_list][1] ) bs_write_te( s, i_ref_max - 1, h->mb.cache.ref[i_list][x264_scan8[8]] );
                        break;
                    case D_8x16:
                        if( b_list[i_list][0] ) bs_write_te( s, i_ref_max - 1, h->mb.cache.ref[i_list][x264_scan8[0]] );
                        if( b_list[i_list][1] ) bs_write_te( s, i_ref_max - 1, h->mb.cache.ref[i_list][x264_scan8[4]] );
                        break;
                }
            }
        }
        for( i_list = 0; i_list < 2; i_list++ )
        {
            switch( h->mb.i_partition )
            {
                case D_16x16:
                    if( b_list[i_list][0] )
                    {
                        x264_mb_predict_mv( h, i_list, 0, 4, mvp );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[0]][0] - mvp[0] );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[0]][1] - mvp[1] );
                    }
                    break;
                case D_16x8:
                    if( b_list[i_list][0] )
                    {
                        x264_mb_predict_mv( h, i_list, 0, 4, mvp );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[0]][0] - mvp[0] );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[0]][1] - mvp[1] );
                    }
                    if( b_list[i_list][1] )
                    {
                        x264_mb_predict_mv( h, i_list, 8, 4, mvp );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[8]][0] - mvp[0] );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[8]][1] - mvp[1] );
                    }
                    break;
                case D_8x16:
                    if( b_list[i_list][0] )
                    {
                        x264_mb_predict_mv( h, i_list, 0, 2, mvp );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[0]][0] - mvp[0] );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[0]][1] - mvp[1] );
                    }
                    if( b_list[i_list][1] )
                    {
                        x264_mb_predict_mv( h, i_list, 4, 2, mvp );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[4]][0] - mvp[0] );
                        bs_write_se( s, h->mb.cache.mv[i_list][x264_scan8[4]][1] - mvp[1] );
                    }
                    break;
            }
        }
    }
    else if( i_mb_type == B_DIRECT )
    {
        bs_write_ue( s, 0 );
    }
    else
    {
        x264_log(h, X264_LOG_ERROR, "invalid/unhandled mb_type\n" );
        return;
    }

    i_mb_pos_tex = bs_pos( s );
    h->stat.frame.i_hdr_bits += i_mb_pos_tex - i_mb_pos_start;

    /* Coded block patern */
    if( i_mb_type == I_4x4 )
    {
        bs_write_ue( s, intra4x4_cbp_to_golomb[( h->mb.i_cbp_chroma << 4 )|h->mb.i_cbp_luma] );
    }
    else if( i_mb_type != I_16x16 )
    {
        bs_write_ue( s, inter_cbp_to_golomb[( h->mb.i_cbp_chroma << 4 )|h->mb.i_cbp_luma] );
    }

    /* write residual */
    if( i_mb_type == I_16x16 )
    {
        bs_write_se( s, h->mb.qp[h->mb.i_mb_xy] - h->mb.i_last_qp );

        /* DC Luma */
        block_residual_write_cavlc( h, s, BLOCK_INDEX_LUMA_DC , h->dct.luma16x16_dc, 16 );

        if( h->mb.i_cbp_luma != 0 )
        {
            /* AC Luma */
            for( i = 0; i < 16; i++ )
            {
                block_residual_write_cavlc( h, s, i, h->dct.block[i].residual_ac, 15 );
            }
        }
    }
    else if( h->mb.i_cbp_luma != 0 || h->mb.i_cbp_chroma != 0 )
    {
        bs_write_se( s, h->mb.qp[h->mb.i_mb_xy] - h->mb.i_last_qp );

        for( i = 0; i < 16; i++ )
        {
            if( h->mb.i_cbp_luma & ( 1 << ( i / 4 ) ) )
            {
                block_residual_write_cavlc( h, s, i, h->dct.block[i].luma4x4, 16 );
            }
        }
    }
    if( h->mb.i_cbp_chroma != 0 )
    {
        /* Chroma DC residual present */
        block_residual_write_cavlc( h, s, BLOCK_INDEX_CHROMA_DC, h->dct.chroma_dc[0], 4 );
        block_residual_write_cavlc( h, s, BLOCK_INDEX_CHROMA_DC, h->dct.chroma_dc[1], 4 );
        if( h->mb.i_cbp_chroma&0x02 ) /* Chroma AC residual present */
        {
            for( i = 0; i < 8; i++ )
            {
                block_residual_write_cavlc( h, s, 16 + i, h->dct.block[16+i].residual_ac, 15 );
            }
        }
    }

    if( IS_INTRA( i_mb_type ) )
        h->stat.frame.i_itex_bits += bs_pos(s) - i_mb_pos_tex;
    else
        h->stat.frame.i_ptex_bits += bs_pos(s) - i_mb_pos_tex;
}