git.sesse.net Git - vlc/blob - plugins/idct/vdec_block.h

   1 /*****************************************************************************
   2  * vdec_block_h: Macroblock copy functions
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000, 2001 VideoLAN
   5  * $Id: vdec_block.h,v 1.2 2001/05/30 17:03:12 sam Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Prototypes
  26  *****************************************************************************/
  27 void _M( vdec_InitDecode )         ( struct vdec_thread_s *p_vdec );
  28 void _M( vdec_DecodeMacroblockC )  ( struct vdec_thread_s *p_vdec,
  29                                      struct macroblock_s * p_mb );
  30 void _M( vdec_DecodeMacroblockBW ) ( struct vdec_thread_s *p_vdec,
  31                                      struct macroblock_s * p_mb );
  32
  33 /*****************************************************************************
  34  * vdec_DecodeMacroblock : decode a macroblock of a picture
  35  *****************************************************************************/
  36 #define DECODEBLOCKSC( OPBLOCK )                                        \
  37 {                                                                       \
  38     int             i_b, i_mask;                                        \
  39                                                                         \
  40     i_mask = 1 << (3 + p_mb->i_chroma_nb_blocks);                       \
  41                                                                         \
  42     /* luminance */                                                     \
  43     for( i_b = 0; i_b < 4; i_b++, i_mask >>= 1 )                        \
  44     {                                                                   \
  45         if( p_mb->i_coded_block_pattern & i_mask )                      \
  46         {                                                               \
  47             /*                                                          \
  48              * Inverse DCT (ISO/IEC 13818-2 section Annex A)            \
  49              */                                                         \
  50             (p_mb->pf_idct[i_b])( p_vdec, p_mb->ppi_blocks[i_b],        \
  51                                   p_mb->pi_sparse_pos[i_b] );           \
  52                                                                         \
  53             /*                                                          \
  54              * Adding prediction and coefficient data (ISO/IEC 13818-2  \
  55              * section 7.6.8)                                           \
  56              */                                                         \
  57             OPBLOCK( p_vdec, p_mb->ppi_blocks[i_b],                     \
  58                      p_mb->p_data[i_b], p_mb->i_addb_l_stride );        \
  59         }                                                               \
  60     }                                                                   \
  61                                                                         \
  62     /* chrominance */                                                   \
  63     for( i_b = 4; i_b < 4 + p_mb->i_chroma_nb_blocks;                   \
  64          i_b++, i_mask >>= 1 )                                          \
  65     {                                                                   \
  66         if( p_mb->i_coded_block_pattern & i_mask )                      \
  67         {                                                               \
  68             /*                                                          \
  69              * Inverse DCT (ISO/IEC 13818-2 section Annex A)            \
  70              */                                                         \
  71             (p_mb->pf_idct[i_b])( p_vdec, p_mb->ppi_blocks[i_b],        \
  72                                   p_mb->pi_sparse_pos[i_b] );           \
  73                                                                         \
  74             /*                                                          \
  75              * Adding prediction and coefficient data (ISO/IEC 13818-2  \
  76              * section 7.6.8)                                           \
  77              */                                                         \
  78             OPBLOCK( p_vdec, p_mb->ppi_blocks[i_b],                     \
  79                      p_mb->p_data[i_b], p_mb->i_addb_c_stride );        \
  80         }                                                               \
  81     }                                                                   \
  82 }
  83
  84 #define DECODEBLOCKSBW( OPBLOCK )                                       \
  85 {                                                                       \
  86     int             i_b, i_mask;                                        \
  87                                                                         \
  88     i_mask = 1 << (3 + p_mb->i_chroma_nb_blocks);                       \
  89                                                                         \
  90     /* luminance */                                                     \
  91     for( i_b = 0; i_b < 4; i_b++, i_mask >>= 1 )                        \
  92     {                                                                   \
  93         if( p_mb->i_coded_block_pattern & i_mask )                      \
  94         {                                                               \
  95             /*                                                          \
  96              * Inverse DCT (ISO/IEC 13818-2 section Annex A)            \
  97              */                                                         \
  98             (p_mb->pf_idct[i_b])( p_vdec, p_mb->ppi_blocks[i_b],        \
  99                                   p_mb->pi_sparse_pos[i_b] );           \
 100                                                                         \
 101             /*                                                          \
 102              * Adding prediction and coefficient data (ISO/IEC 13818-2  \
 103              * section 7.6.8)                                           \
 104              */                                                         \
 105             OPBLOCK( p_vdec, p_mb->ppi_blocks[i_b],                     \
 106                      p_mb->p_data[i_b], p_mb->i_addb_l_stride );        \
 107         }                                                               \
 108     }                                                                   \
 109 }
 110