[cvs] / xvidcore / src / utils / mem_transfer.c Repository:
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Diff of /xvidcore/src/utils/mem_transfer.c

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revision 1.4, Sat Jun 15 22:15:57 2002 UTC revision 1.10, Mon Mar 22 22:36:24 2004 UTC
# Line 3  Line 3 
3   *  XVID MPEG-4 VIDEO CODEC   *  XVID MPEG-4 VIDEO CODEC
4   *  - 8bit<->16bit transfer  -   *  - 8bit<->16bit transfer  -
5   *   *
6     *  Copyright(C) 2001-2003 Peter Ross <pross@xvid.org>
7     *
8   *  This program is free software ; you can redistribute it and/or modify   *  This program is free software ; you can redistribute it and/or modify
9   *  it under the terms of the GNU General Public License as published by   *  it under the terms of the GNU General Public License as published by
10   *  the Free Software Foundation ; either version 2 of the License, or   *  the Free Software Foundation ; either version 2 of the License, or
# Line 17  Line 19 
19   *  along with this program ; if not, write to the Free Software   *  along with this program ; if not, write to the Free Software
20   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
21   *   *
  ****************************************************************************/  
 /*****************************************************************************  
  *  
  *  History  
  *  
  *  - 14.06.2002 Changed legal header with the new FSF address  
  *      - 14.04.2002 added transfer_8to16sub2  
  *      - 07.01.2002 merge functions from compensate; rename functions  
  *      - 22.12.2001 transfer_8to8add16 limit fix  
  *      - 07.11.2001 initial version; (c)2001 peter ross <pross@cs.rmit.edu.au>  
  *  
22   *  $Id$   *  $Id$
23   *   *
24   ****************************************************************************/   ****************************************************************************/
# Line 41  Line 32 
32  TRANSFER_16TO8COPY_PTR transfer_16to8copy;  TRANSFER_16TO8COPY_PTR transfer_16to8copy;
33    
34  TRANSFER_8TO16SUB_PTR  transfer_8to16sub;  TRANSFER_8TO16SUB_PTR  transfer_8to16sub;
35    TRANSFER_8TO16SUBRO_PTR  transfer_8to16subro;
36  TRANSFER_8TO16SUB2_PTR transfer_8to16sub2;  TRANSFER_8TO16SUB2_PTR transfer_8to16sub2;
37  TRANSFER_16TO8ADD_PTR  transfer_16to8add;  TRANSFER_16TO8ADD_PTR  transfer_16to8add;
38    
# Line 145  Line 137 
137  }  }
138    
139    
140    void
141    transfer_8to16subro_c(int16_t * const dct,
142                                            const uint8_t * const cur,
143                                            const uint8_t * ref,
144                                            const uint32_t stride)
145    {
146            uint32_t i, j;
147    
148            for (j = 0; j < 8; j++) {
149                    for (i = 0; i < 8; i++) {
150                            uint8_t c = cur[j * stride + i];
151                            uint8_t r = ref[j * stride + i];
152                            dct[j * 8 + i] = (int16_t) c - (int16_t) r;
153                    }
154            }
155    }
156    
157    
158    
159  /*  /*
160   * C   - the current buffer   * C   - the current buffer
161   * R1  - the 1st reference buffer   * R1  - the 1st reference buffer
# Line 155  Line 166 
166   *   *
167   *    R1  (8bit) = R1   *    R1  (8bit) = R1
168   *    R2  (8bit) = R2   *    R2  (8bit) = R2
169   *    C   (8bit) = C   *    R   (temp) = min((R1 + R2)/2, 255)
170   *    DCT (16bit)= C - min((R1 + R2)/2, 255)   *    DCT (16bit)= C - R
171     *    C   (8bit) = R
172   */   */
173  void  void
174  transfer_8to16sub2_c(int16_t * const dct,  transfer_8to16sub2_c(int16_t * const dct,
# Line 175  Line 187 
187                          if (r > 255) {                          if (r > 255) {
188                                  r = 255;                                  r = 255;
189                          }                          }
190                          //cur[j * stride + i] = r;                          cur[j * stride + i] = r;
191                          dct[j * 8 + i] = (int16_t) c - (int16_t) r;                          dct[j * 8 + i] = (int16_t) c - (int16_t) r;
192                  }                  }
193          }          }
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