macroblock.c
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上传日期:2021-12-09
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文件大小:28k
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Audio
开发平台:
Visual C++
- /*****************************************************************************
- * macroblock.c: h264 decoder library
- *****************************************************************************
- * Copyright (C) 2003 Laurent Aimar
- * $Id: macroblock.c,v 1.1 2004/06/03 19:27:07 fenrir Exp $
- *
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
- #include <stdint.h>
- #include "common/common.h"
- #include "common/vlc.h"
- #include "vlc.h"
- #include "macroblock.h"
- static const uint8_t block_idx_x[16] =
- {
- 0, 1, 0, 1, 2, 3, 2, 3, 0, 1, 0, 1, 2, 3, 2, 3
- };
- static const uint8_t block_idx_y[16] =
- {
- 0, 0, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 2, 2, 3, 3
- };
- static const uint8_t block_idx_xy[4][4] =
- {
- { 0, 2, 8, 10},
- { 1, 3, 9, 11},
- { 4, 6, 12, 14},
- { 5, 7, 13, 15}
- };
- static const int golomb_to_intra4x4_cbp[48]=
- {
- 47, 31, 15, 0, 23, 27, 29, 30, 7, 11, 13, 14, 39, 43, 45, 46,
- 16, 3, 5, 10, 12, 19, 21, 26, 28, 35, 37, 42, 44, 1, 2, 4,
- 8, 17, 18, 20, 24, 6, 9, 22, 25, 32, 33, 34, 36, 40, 38, 41
- };
- static const int golomb_to_inter_cbp[48]=
- {
- 0, 16, 1, 2, 4, 8, 32, 3, 5, 10, 12, 15, 47, 7, 11, 13,
- 14, 6, 9, 31, 35, 37, 42, 44, 33, 34, 36, 40, 39, 43, 45, 46,
- 17, 18, 20, 24, 19, 21, 26, 28, 23, 27, 29, 30, 22, 25, 38, 41
- };
- static const int i_chroma_qp_table[52] =
- {
- 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
- 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
- 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
- 29, 30, 31, 32, 32, 33, 34, 34, 35, 35,
- 36, 36, 37, 37, 37, 38, 38, 38, 39, 39,
- 39, 39
- };
- void x264_mb_partition_ref_set( x264_macroblock_t *mb, int i_list, int i_part, int i_ref )
- {
- int x, y;
- int w, h;
- int dx, dy;
- x264_mb_partition_getxy( mb, i_part, 0, &x, &y );
- if( mb->i_partition == D_16x16 )
- {
- w = 4; h = 4;
- }
- else if( mb->i_partition == D_16x8 )
- {
- w = 4; h = 2;
- }
- else if( mb->i_partition == D_8x16 )
- {
- w = 2; h = 4;
- }
- else
- {
- /* D_8x8 */
- w = 2; h = 2;
- }
- for( dx = 0; dx < w; dx++ )
- {
- for( dy = 0; dy < h; dy++ )
- {
- mb->partition[x+dx][y+dy].i_ref[i_list] = i_ref;
- }
- }
- }
- void x264_mb_partition_mv_set( x264_macroblock_t *mb, int i_list, int i_part, int i_sub, int mv[2] )
- {
- int x, y;
- int w, h;
- int dx, dy;
- x264_mb_partition_getxy( mb, i_part, i_sub, &x, &y );
- x264_mb_partition_size ( mb, i_part, i_sub, &w, &h );
- for( dx = 0; dx < w; dx++ )
- {
- for( dy = 0; dy < h; dy++ )
- {
- mb->partition[x+dx][y+dy].mv[i_list][0] = mv[0];
- mb->partition[x+dx][y+dy].mv[i_list][1] = mv[1];
- }
- }
- }
- int x264_macroblock_read_cabac( x264_t *h, bs_t *s, x264_macroblock_t *mb )
- {
- return -1;
- }
- static int x264_macroblock_decode_ipcm( x264_t *h, bs_t *s, x264_macroblock_t *mb )
- {
- /* TODO */
- return -1;
- }
- #define BLOCK_INDEX_CHROMA_DC (-1)
- #define BLOCK_INDEX_LUMA_DC (-2)
- static int bs_read_vlc( bs_t *s, x264_vlc_table_t *table )
- {
- int i_nb_bits;
- int i_value = 0;
- int i_bits;
- int i_index;
- int i_level = 0;
- i_index = bs_show( s, table->i_lookup_bits );
- if( i_index >= table->i_lookup )
- {
- return( -1 );
- }
- i_value = table->lookup[i_index].i_value;
- i_bits = table->lookup[i_index].i_size;
- while( i_bits < 0 )
- {
- i_level++;
- if( i_level > 5 )
- {
- return( -1 ); // FIXME what to do ?
- }
- bs_skip( s, table->i_lookup_bits );
- i_nb_bits = -i_bits;
- i_index = bs_show( s, i_nb_bits ) + i_value;
- if( i_index >= table->i_lookup )
- {
- return( -1 );
- }
- i_value = table->lookup[i_index].i_value;
- i_bits = table->lookup[i_index].i_size;
- }
- bs_skip( s, i_bits );
- return( i_value );
- }
- static int block_residual_read_cavlc( x264_t *h, bs_t *s, x264_macroblock_t *mb,
- int i_idx, int *l, int i_count )
- {
- int i;
- int level[16], run[16];
- int i_coeff;
- int i_total, i_trailing;
- int i_suffix_length;
- int i_zero_left;
- for( i = 0; i < i_count; i++ )
- {
- l[i] = 0;
- }
- /* total/trailing */
- if( i_idx == BLOCK_INDEX_CHROMA_DC )
- {
- int i_tt;
- if( ( i_tt = bs_read_vlc( s, h->x264_coeff_token_lookup[4] )) < 0 )
- {
- return -1;
- }
- i_total = i_tt / 4;
- i_trailing = i_tt % 4;
- }
- else
- {
- /* x264_mb_predict_non_zero_code return 0 <-> (16+16+1)>>1 = 16 */
- static const int ct_index[17] = {0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,3 };
- int nC;
- int i_tt;
- if( i_idx == BLOCK_INDEX_LUMA_DC )
- {
- nC = x264_mb_predict_non_zero_code( h, mb, 0 );
- }
- else
- {
- nC = x264_mb_predict_non_zero_code( h, mb, i_idx );
- }
- if( ( i_tt = bs_read_vlc( s, h->x264_coeff_token_lookup[ct_index[nC]] ) ) < 0 )
- {
- return -1;
- }
- i_total = i_tt / 4;
- i_trailing = i_tt % 4;
- }
- if( i_idx >= 0 )
- {
- mb->block[i_idx].i_non_zero_count = i_total;
- }
- if( i_total <= 0 )
- {
- return 0;
- }
- i_suffix_length = i_total > 10 && i_trailing < 3 ? 1 : 0;
- for( i = 0; i < i_trailing; i++ )
- {
- level[i] = 1 - 2 * bs_read1( s );
- }
- for( ; i < i_total; i++ )
- {
- int i_prefix;
- int i_level_code;
- i_prefix = bs_read_vlc( s, h->x264_level_prefix_lookup );
- if( i_prefix == -1 )
- {
- return -1;
- }
- else if( i_prefix < 14 )
- {
- if( i_suffix_length > 0 )
- {
- i_level_code = (i_prefix << i_suffix_length) + bs_read( s, i_suffix_length );
- }
- else
- {
- i_level_code = i_prefix;
- }
- }
- else if( i_prefix == 14 )
- {
- if( i_suffix_length > 0 )
- {
- i_level_code = (i_prefix << i_suffix_length) + bs_read( s, i_suffix_length );
- }
- else
- {
- i_level_code = i_prefix + bs_read( s, 4 );
- }
- }
- else /* if( i_prefix == 15 ) */
- {
- i_level_code = (i_prefix << i_suffix_length) + bs_read( s, 12 );
- if( i_suffix_length == 0 )
- {
- i_level_code += 15;
- }
- }
- if( i == i_trailing && i_trailing < 3 )
- {
- i_level_code += 2;
- }
- /* Optimise */
- level[i] = i_level_code&0x01 ? -((i_level_code+1)/2) : (i_level_code+2)/2;
- if( i_suffix_length == 0 )
- {
- i_suffix_length++;
- }
- if( abs( level[i] ) > ( 3 << ( i_suffix_length - 1 ) ) && i_suffix_length < 6 )
- {
- i_suffix_length++;
- }
- }
- if( i_total < i_count )
- {
- if( i_idx == BLOCK_INDEX_CHROMA_DC )
- {
- i_zero_left = bs_read_vlc( s, h->x264_total_zeros_dc_lookup[i_total-1] );
- }
- else
- {
- i_zero_left = bs_read_vlc( s, h->x264_total_zeros_lookup[i_total-1] );
- }
- if( i_zero_left < 0 )
- {
- return -1;
- }
- }
- else
- {
- i_zero_left = 0;
- }
- for( i = 0; i < i_total - 1; i++ )
- {
- if( i_zero_left <= 0 )
- {
- break;
- }
- run[i] = bs_read_vlc( s, h->x264_run_before_lookup[X264_MIN( i_zero_left - 1, 6 )] );
- if( run[i] < 0 )
- {
- return -1;
- }
- i_zero_left -= run[i];
- }
- if( i_zero_left < 0 )
- {
- return -1;
- }
- for( ; i < i_total - 1; i++ )
- {
- run[i] = 0;
- }
- run[i_total-1] = i_zero_left;
- i_coeff = -1;
- for( i = i_total - 1; i >= 0; i-- )
- {
- i_coeff += run[i] + 1;
- l[i_coeff] = level[i];
- }
- return 0;
- }
- static inline void array_zero_set( int *l, int i_count )
- {
- int i;
- for( i = 0; i < i_count; i++ )
- {
- l[i] = 0;
- }
- }
- int x264_macroblock_read_cavlc( x264_t *h, bs_t *s, x264_macroblock_t *mb )
- {
- int i_mb_i_offset;
- int i_mb_p_offset;
- int b_sub_ref0 = 0;
- int i_type;
- int i;
- /* read the mb type */
- switch( h->sh.i_type )
- {
- case SLICE_TYPE_I:
- i_mb_p_offset = 0; /* shut up gcc */
- i_mb_i_offset = 0;
- break;
- case SLICE_TYPE_P:
- i_mb_p_offset = 0;
- i_mb_i_offset = 5;
- break;
- case SLICE_TYPE_B:
- i_mb_p_offset = 23;
- i_mb_i_offset = 23 + 5;
- break;
- default:
- fprintf( stderr, "internal error or slice unsupportedn" );
- return -1;
- }
- i_type = bs_read_ue( s );
- if( i_type < i_mb_i_offset )
- {
- if( i_type < i_mb_p_offset )
- {
- fprintf( stderr, "unsupported mb type(B*)n" );
- /* TODO for B frame */
- return -1;
- }
- else
- {
- i_type -= i_mb_p_offset;
- if( i_type == 0 )
- {
- mb->i_type = P_L0;
- mb->i_partition = D_16x16;
- }
- else if( i_type == 1 )
- {
- mb->i_type = P_L0;
- mb->i_partition = D_16x8;
- }
- else if( i_type == 2 )
- {
- mb->i_type = P_L0;
- mb->i_partition = D_8x16;
- }
- else if( i_type == 3 || i_type == 4 )
- {
- mb->i_type = P_8x8;
- mb->i_partition = D_8x8;
- b_sub_ref0 = i_type == 4 ? 1 : 0;
- }
- else
- {
- fprintf( stderr, "invalid mb typen" );
- return -1;
- }
- }
- }
- else
- {
- i_type -= i_mb_i_offset;
- if( i_type == 0 )
- {
- mb->i_type = I_4x4;
- }
- else if( i_type < 25 )
- {
- mb->i_type = I_16x16;
- mb->i_intra16x16_pred_mode = (i_type - 1)%4;
- mb->i_cbp_chroma = ( (i_type-1) / 4 )%3;
- mb->i_cbp_luma = ((i_type-1) / 12) ? 0x0f : 0x00;
- }
- else if( i_type == 25 )
- {
- mb->i_type = I_PCM;
- }
- else
- {
- fprintf( stderr, "invalid mb type (%d)n", i_type );
- return -1;
- }
- }
- if( mb->i_type == I_PCM )
- {
- return x264_macroblock_decode_ipcm( h, s, mb );
- }
- if( IS_INTRA( mb->i_type ) )
- {
- if( mb->i_type == I_4x4 )
- {
- for( i = 0; i < 16; i++ )
- {
- int b_coded;
- b_coded = bs_read1( s );
- if( b_coded )
- {
- mb->block[i].i_intra4x4_pred_mode = x264_mb_predict_intra4x4_mode( h, mb, i );
- }
- else
- {
- int i_predicted_mode = x264_mb_predict_intra4x4_mode( h, mb, i );
- int i_mode = bs_read( s, 3 );
- if( i_mode >= i_predicted_mode )
- {
- mb->block[i].i_intra4x4_pred_mode = i_mode + 1;
- }
- else
- {
- mb->block[i].i_intra4x4_pred_mode = i_mode;
- }
- }
- }
- }
- mb->i_chroma_pred_mode = bs_read_ue( s );
- }
- else if( mb->i_type == P_8x8 || mb->i_type == B_8x8)
- {
- /* FIXME won't work for B_8x8 */
- for( i = 0; i < 4; i++ )
- {
- int i_sub_partition;
- i_sub_partition = bs_read_ue( s );
- switch( i_sub_partition )
- {
- case 0:
- mb->i_sub_partition[i] = D_L0_8x8;
- break;
- case 1:
- mb->i_sub_partition[i] = D_L0_8x4;
- break;
- case 2:
- mb->i_sub_partition[i] = D_L0_4x8;
- break;
- case 3:
- mb->i_sub_partition[i] = D_L0_4x4;
- break;
- default:
- fprintf( stderr, "invalid i_sub_partitionn" );
- return -1;
- }
- }
- for( i = 0; i < 4; i++ )
- {
- int i_ref;
- i_ref = b_sub_ref0 ? 0 : bs_read_te( s, h->sh.i_num_ref_idx_l0_active - 1 );
- x264_mb_partition_ref_set( mb, 0, i, i_ref );
- }
- for( i = 0; i < 4; i++ )
- {
- int i_sub;
- int i_ref;
- x264_mb_partition_get( mb, 0, i, 0, &i_ref, NULL, NULL );
- for( i_sub = 0; i_sub < x264_mb_partition_count_table[mb->i_sub_partition[i]]; i_sub++ )
- {
- int mv[2];
- x264_mb_predict_mv( mb, 0, i, i_sub, mv );
- mv[0] += bs_read_se( s );
- mv[1] += bs_read_se( s );
- x264_mb_partition_mv_set( mb, 0, i, i_sub, mv );
- }
- }
- }
- else if( mb->i_type != B_DIRECT )
- {
- /* FIXME will work only for P block */
- /* FIXME using x264_mb_partition_set/x264_mb_partition_get here are too unoptimised
- * I should introduce ref and mv get/set */
- /* Motion Vector */
- int i_part = x264_mb_partition_count_table[mb->i_partition];
- for( i = 0; i < i_part; i++ )
- {
- int i_ref;
- i_ref = bs_read_te( s, h->sh.i_num_ref_idx_l0_active - 1 );
- x264_mb_partition_ref_set( mb, 0, i, i_ref );
- }
- for( i = 0; i < i_part; i++ )
- {
- int mv[2];
- x264_mb_predict_mv( mb, 0, i, 0, mv );
- mv[0] += bs_read_se( s );
- mv[1] += bs_read_se( s );
- x264_mb_partition_mv_set( mb, 0, i, 0, mv );
- }
- }
- if( mb->i_type != I_16x16 )
- {
- int i_cbp;
- i_cbp = bs_read_ue( s );
- if( i_cbp >= 48 )
- {
- fprintf( stderr, "invalid cbpn" );
- return -1;
- }
- if( mb->i_type == I_4x4 )
- {
- i_cbp = golomb_to_intra4x4_cbp[i_cbp];
- }
- else
- {
- i_cbp = golomb_to_inter_cbp[i_cbp];
- }
- mb->i_cbp_luma = i_cbp&0x0f;
- mb->i_cbp_chroma = i_cbp >> 4;
- }
- if( mb->i_cbp_luma > 0 || mb->i_cbp_chroma > 0 || mb->i_type == I_16x16 )
- {
- mb->i_qp = bs_read_se( s ) + h->pps->i_pic_init_qp + h->sh.i_qp_delta;
- /* write residual */
- if( mb->i_type == I_16x16 )
- {
- /* DC Luma */
- if( block_residual_read_cavlc( h, s, mb, BLOCK_INDEX_LUMA_DC , mb->luma16x16_dc, 16 ) < 0 )
- {
- return -1;
- }
- if( mb->i_cbp_luma != 0 )
- {
- /* AC Luma */
- for( i = 0; i < 16; i++ )
- {
- if( block_residual_read_cavlc( h, s, mb, i, mb->block[i].residual_ac, 15 ) < 0 )
- {
- return -1;
- }
- }
- }
- else
- {
- for( i = 0; i < 16; i++ )
- {
- mb->block[i].i_non_zero_count = 0;
- array_zero_set( mb->block[i].residual_ac, 15 );
- }
- }
- }
- else
- {
- for( i = 0; i < 16; i++ )
- {
- if( mb->i_cbp_luma & ( 1 << ( i / 4 ) ) )
- {
- if( block_residual_read_cavlc( h, s, mb, i, mb->block[i].luma4x4, 16 ) < 0 )
- {
- return -1;
- }
- }
- else
- {
- mb->block[i].i_non_zero_count = 0;
- array_zero_set( mb->block[i].luma4x4, 16 );
- }
- }
- }
- if( mb->i_cbp_chroma &0x03 ) /* Chroma DC residual present */
- {
- if( block_residual_read_cavlc( h, s, mb, BLOCK_INDEX_CHROMA_DC, mb->chroma_dc[0], 4 ) < 0 ||
- block_residual_read_cavlc( h, s, mb, BLOCK_INDEX_CHROMA_DC, mb->chroma_dc[1], 4 ) < 0 )
- {
- return -1;
- }
- }
- else
- {
- array_zero_set( mb->chroma_dc[0], 4 );
- array_zero_set( mb->chroma_dc[1], 4 );
- }
- if( mb->i_cbp_chroma&0x02 ) /* Chroma AC residual present */
- {
- for( i = 0; i < 8; i++ )
- {
- if( block_residual_read_cavlc( h, s, mb, 16 + i, mb->block[16+i].residual_ac, 15 ) < 0 )
- {
- return -1;
- }
- }
- }
- else
- {
- for( i = 0; i < 8; i++ )
- {
- mb->block[16+i].i_non_zero_count = 0;
- array_zero_set( mb->block[16+i].residual_ac, 15 );
- }
- }
- }
- else
- {
- mb->i_qp = h->pps->i_pic_init_qp + h->sh.i_qp_delta;
- for( i = 0; i < 16; i++ )
- {
- mb->block[i].i_non_zero_count = 0;
- array_zero_set( mb->block[i].luma4x4, 16 );
- }
- array_zero_set( mb->chroma_dc[0], 4 );
- array_zero_set( mb->chroma_dc[1], 4 );
- for( i = 0; i < 8; i++ )
- {
- array_zero_set( mb->block[16+i].residual_ac, 15 );
- mb->block[16+i].i_non_zero_count = 0;
- }
- }
- //fprintf( stderr, "mb read type=%dn", mb->i_type );
- return 0;
- }
- static int x264_mb_pred_mode16x16_valid( x264_macroblock_t *mb, int i_mode )
- {
- if( ( mb->i_neighbour & (MB_LEFT|MB_TOP) ) == (MB_LEFT|MB_TOP) )
- {
- return i_mode;
- }
- else if( ( mb->i_neighbour & MB_LEFT ) )
- {
- if( i_mode == I_PRED_16x16_DC )
- {
- return I_PRED_16x16_DC_LEFT;
- }
- else if( i_mode == I_PRED_16x16_H )
- {
- return I_PRED_16x16_H;
- }
- fprintf( stderr, "invalid 16x16 predictionn" );
- return I_PRED_16x16_DC_LEFT;
- }
- else if( ( mb->i_neighbour & MB_TOP ) )
- {
- if( i_mode == I_PRED_16x16_DC )
- {
- return I_PRED_16x16_DC_TOP;
- }
- else if( i_mode == I_PRED_16x16_V )
- {
- return I_PRED_16x16_V;
- }
- fprintf( stderr, "invalid 16x16 predictionn" );
- return I_PRED_16x16_DC_TOP;
- }
- else
- {
- return I_PRED_16x16_DC_128;
- }
- }
- static int x264_mb_pred_mode8x8_valid( x264_macroblock_t *mb, int i_mode )
- {
- if( ( mb->i_neighbour & (MB_LEFT|MB_TOP) ) == (MB_LEFT|MB_TOP) )
- {
- return i_mode;
- }
- else if( ( mb->i_neighbour & MB_LEFT ) )
- {
- if( i_mode == I_PRED_CHROMA_DC )
- {
- return I_PRED_CHROMA_DC_LEFT;
- }
- else if( i_mode == I_PRED_CHROMA_H )
- {
- return I_PRED_CHROMA_H;
- }
- fprintf( stderr, "invalid 8x8 predictionn" );
- return I_PRED_CHROMA_DC_LEFT;
- }
- else if( ( mb->i_neighbour & MB_TOP ) )
- {
- if( i_mode == I_PRED_CHROMA_DC )
- {
- return I_PRED_CHROMA_DC_TOP;
- }
- else if( i_mode == I_PRED_CHROMA_V )
- {
- return I_PRED_CHROMA_V;
- }
- fprintf( stderr, "invalid 8x8 predictionn" );
- return I_PRED_CHROMA_DC_TOP;
- }
- else
- {
- return I_PRED_CHROMA_DC_128;
- }
- }
- static int x264_mb_pred_mode4x4_valid( x264_macroblock_t *mb, int idx, int i_mode, int *pb_emu )
- {
- int b_a, b_b, b_c;
- static const int needmb[16] =
- {
- MB_LEFT|MB_TOP, MB_TOP,
- MB_LEFT, MB_PRIVATE,
- MB_TOP, MB_TOP|MB_TOPRIGHT,
- 0, MB_PRIVATE,
- MB_LEFT, 0,
- MB_LEFT, MB_PRIVATE,
- 0, MB_PRIVATE,
- 0, MB_PRIVATE
- };
- int b_emu = 0;
- *pb_emu = 0;
- b_a = (needmb[idx]&mb->i_neighbour&MB_LEFT) == (needmb[idx]&MB_LEFT);
- b_b = (needmb[idx]&mb->i_neighbour&MB_TOP) == (needmb[idx]&MB_TOP);
- b_c = (needmb[idx]&mb->i_neighbour&(MB_TOPRIGHT|MB_PRIVATE)) == (needmb[idx]&(MB_TOPRIGHT|MB_PRIVATE));
- if( b_c == 0 && b_b )
- {
- b_emu = 1;
- b_c = 1;
- }
- /* handle I_PRED_4x4_DC */
- if( i_mode == I_PRED_4x4_DC )
- {
- if( b_a && b_b )
- {
- return I_PRED_4x4_DC;
- }
- else if( b_a )
- {
- return I_PRED_4x4_DC_LEFT;
- }
- else if( b_b )
- {
- return I_PRED_4x4_DC_TOP;
- }
- return I_PRED_4x4_DC_128;
- }
- /* handle 1 dir needed only */
- if( ( b_a && i_mode == I_PRED_4x4_H ) ||
- ( b_b && i_mode == I_PRED_4x4_V ) )
- {
- return i_mode;
- }
- /* handle b_c case (b_b always true) */
- if( b_c && ( i_mode == I_PRED_4x4_DDL || i_mode == I_PRED_4x4_VL ) )
- {
- *pb_emu = b_emu;
- return i_mode;
- }
- if( b_a && b_b )
- {
- /* I_PRED_4x4_DDR, I_PRED_4x4_VR, I_PRED_4x4_HD, I_PRED_4x4_HU */
- return i_mode;
- }
- fprintf( stderr, "invalid 4x4 predict mode(%d, mb:%x-%x idx:%dn", i_mode, mb->i_mb_x, mb->i_mb_y, idx );
- return I_PRED_CHROMA_DC_128; /* unefficient */
- }
- /****************************************************************************
- * UnScan functions
- ****************************************************************************/
- static const int scan_zigzag_x[16]={0, 1, 0, 0, 1, 2, 3, 2, 1, 0, 1, 2, 3, 3, 2, 3};
- static const int scan_zigzag_y[16]={0, 0, 1, 2, 1, 0, 0, 1, 2, 3, 3, 2, 1, 2, 3, 3};
- static inline void unscan_zigzag_4x4full( int16_t dct[4][4], int level[16] )
- {
- int i;
- for( i = 0; i < 16; i++ )
- {
- dct[scan_zigzag_y[i]][scan_zigzag_x[i]] = level[i];
- }
- }
- static inline void unscan_zigzag_4x4( int16_t dct[4][4], int level[15] )
- {
- int i;
- for( i = 1; i < 16; i++ )
- {
- dct[scan_zigzag_y[i]][scan_zigzag_x[i]] = level[i - 1];
- }
- }
- static inline void unscan_zigzag_2x2_dc( int16_t dct[2][2], int level[4] )
- {
- dct[0][0] = level[0];
- dct[0][1] = level[1];
- dct[1][0] = level[2];
- dct[1][1] = level[3];
- }
- int x264_macroblock_decode( x264_t *h, x264_macroblock_t *mb )
- {
- x264_mb_context_t *ctx = mb->context;
- int i_qscale;
- int ch;
- int i;
- if( !IS_INTRA(mb->i_type ) )
- {
- /* Motion compensation */
- x264_mb_mc( h, mb );
- }
- /* luma */
- i_qscale = mb->i_qp;
- if( mb->i_type == I_16x16 )
- {
- int i_mode = x264_mb_pred_mode16x16_valid( mb, mb->i_intra16x16_pred_mode );
- int16_t luma[16][4][4];
- int16_t dct4x4[16+1][4][4];
- /* do the right prediction */
- h->predict_16x16[i_mode]( ctx->p_fdec[0], ctx->i_fdec[0] );
- /* get dc coeffs */
- unscan_zigzag_4x4full( dct4x4[0], mb->luma16x16_dc );
- h->dctf.idct4x4dc( dct4x4[0], dct4x4[0] );
- x264_mb_dequant_4x4_dc( dct4x4[0], i_qscale );
- /* decode the 16x16 macroblock */
- for( i = 0; i < 16; i++ )
- {
- unscan_zigzag_4x4( dct4x4[1+i], mb->block[i].residual_ac );
- x264_mb_dequant_4x4( dct4x4[1+i], i_qscale );
- /* copy dc coeff */
- dct4x4[1+i][0][0] = dct4x4[0][block_idx_y[i]][block_idx_x[i]];
- h->dctf.idct4x4( luma[i], dct4x4[i+1] );
- }
- /* put pixels to fdec */
- h->pixf.add16x16( ctx->p_fdec[0], ctx->i_fdec[0], luma );
- }
- else if( mb->i_type == I_4x4 )
- {
- for( i = 0; i < 16; i++ )
- {
- int16_t luma[4][4];
- int16_t dct4x4[4][4];
- uint8_t *p_dst_by;
- int i_mode;
- int b_emu;
- /* Do the right prediction */
- p_dst_by = ctx->p_fdec[0] + 4 * block_idx_x[i] + 4 * block_idx_y[i] * ctx->i_fdec[0];
- i_mode = x264_mb_pred_mode4x4_valid( mb, i, mb->block[i].i_intra4x4_pred_mode, &b_emu );
- if( b_emu )
- {
- fprintf( stderr, "mmmh b_emun" );
- memset( &p_dst_by[4], p_dst_by[3], 4 );
- }
- h->predict_4x4[i_mode]( p_dst_by, ctx->i_fdec[0] );
- if( mb->block[i].i_non_zero_count > 0 )
- {
- /* decode one 4x4 block */
- unscan_zigzag_4x4full( dct4x4, mb->block[i].luma4x4 );
- x264_mb_dequant_4x4( dct4x4, i_qscale );
- h->dctf.idct4x4( luma, dct4x4 );
- h->pixf.add4x4( p_dst_by, ctx->i_fdec[0], luma );
- }
- }
- }
- else /* Inter mb */
- {
- for( i = 0; i < 16; i++ )
- {
- uint8_t *p_dst_by;
- int16_t luma[4][4];
- int16_t dct4x4[4][4];
- if( mb->block[i].i_non_zero_count > 0 )
- {
- unscan_zigzag_4x4full( dct4x4, mb->block[i].luma4x4 );
- x264_mb_dequant_4x4( dct4x4, i_qscale );
- h->dctf.idct4x4( luma, dct4x4 );
- p_dst_by = ctx->p_fdec[0] + 4 * block_idx_x[i] + 4 * block_idx_y[i] * ctx->i_fdec[0];
- h->pixf.add4x4( p_dst_by, ctx->i_fdec[0], luma );
- }
- }
- }
- /* chroma */
- i_qscale = i_chroma_qp_table[x264_clip3( i_qscale + h->pps->i_chroma_qp_index_offset, 0, 51 )];
- if( IS_INTRA( mb->i_type ) )
- {
- int i_mode = x264_mb_pred_mode8x8_valid( mb, mb->i_chroma_pred_mode );
- /* do the right prediction */
- h->predict_8x8[i_mode]( ctx->p_fdec[1], ctx->i_fdec[1] );
- h->predict_8x8[i_mode]( ctx->p_fdec[2], ctx->i_fdec[2] );
- }
- if( mb->i_cbp_chroma != 0 )
- {
- for( ch = 0; ch < 2; ch++ )
- {
- int16_t chroma[4][4][4];
- int16_t dct2x2[2][2];
- int16_t dct4x4[4][4][4];
- /* get dc chroma */
- unscan_zigzag_2x2_dc( dct2x2, mb->chroma_dc[ch] );
- h->dctf.idct2x2dc( dct2x2, dct2x2 );
- x264_mb_dequant_2x2_dc( dct2x2, i_qscale );
- for( i = 0; i < 4; i++ )
- {
- unscan_zigzag_4x4( dct4x4[i], mb->block[16+i+ch*4].residual_ac );
- x264_mb_dequant_4x4( dct4x4[i], i_qscale );
- /* copy dc coeff */
- dct4x4[i][0][0] = dct2x2[block_idx_y[i]][block_idx_x[i]];
- h->dctf.idct4x4( chroma[i], dct4x4[i] );
- }
- h->pixf.add8x8( ctx->p_fdec[1+ch], ctx->i_fdec[1+ch], chroma );
- }
- }
- return 0;
- }
- void x264_macroblock_decode_skip( x264_t *h, x264_macroblock_t *mb )
- {
- int i;
- int x, y;
- int mv[2];
- /* decode it as a 16x16 with no luma/chroma */
- mb->i_type = P_L0;
- mb->i_partition = D_16x16;
- mb->i_cbp_luma = 0;
- mb->i_cbp_chroma = 0;
- for( i = 0; i < 16 + 8; i++ )
- {
- mb->block[i].i_non_zero_count = 0;
- }
- for( i = 0; i < 16; i++ )
- {
- array_zero_set( mb->block[i].luma4x4, 16 );
- }
- array_zero_set( mb->chroma_dc[0], 4 );
- array_zero_set( mb->chroma_dc[1], 4 );
- for( i = 0; i < 8; i++ )
- {
- array_zero_set( mb->block[16+i].residual_ac, 15 );
- }
- /* set ref0 */
- for( x = 0; x < 4; x++ )
- {
- for( y = 0; y < 4; y++ )
- {
- mb->partition[x][y].i_ref[0] = 0;
- }
- }
- /* get mv */
- x264_mb_predict_mv_pskip( mb, mv );
- x264_mb_partition_mv_set( mb, 0, 0, 0, mv );
- /* Motion compensation */
- x264_mb_mc( h, mb );
- mb->i_type = P_SKIP;
- }