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revision 1.3, Wed Jun 12 20:38:41 2002 UTC revision 1.4, Sat Jun 15 22:15:57 2002 UTC
# Line 1  Line 1 
1  /**************************************************************************  /*****************************************************************************
2   *   *
3   *      XVID MPEG-4 VIDEO CODEC   *      XVID MPEG-4 VIDEO CODEC
4   *      8bit<->16bit transfer   *  - 8bit<->16bit transfer  -
  *  
  *      This program is an implementation of a part of one or more MPEG-4  
  *      Video tools as specified in ISO/IEC 14496-2 standard.  Those intending  
  *      to use this software module in hardware or software products are  
  *      advised that its use may infringe existing patents or copyrights, and  
  *      any such use would be at such party's own risk.  The original  
  *      developer of this software module and his/her company, and subsequent  
  *      editors and their companies, will have no liability for use of this  
  *      software or modifications or derivatives thereof.  
5   *   *
6   *      This program is free software; you can redistribute it and/or modify   *      This program is free software; you can redistribute it and/or modify
7   *      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
# Line 24  Line 15 
15   *   *
16   *      You should have received a copy of the GNU General Public License   *      You should have received a copy of the GNU General Public License
17   *      along with this program; if not, write to the Free Software   *      along with this program; if not, write to the Free Software
18   *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19   *   *
20   *************************************************************************/   ****************************************************************************/
21    /*****************************************************************************
22  /**************************************************************************   *
23     *  History
24   *   *
25   *      History:   *  - 14.06.2002 Changed legal header with the new FSF address
26     *      - 14.04.2002 added transfer_8to16sub2
27     *      - 07.01.2002 merge functions from compensate; rename functions
28     *      - 22.12.2001 transfer_8to8add16 limit fix
29     *      - 07.11.2001 initial version; (c)2001 peter ross <pross@cs.rmit.edu.au>
30   *   *
31   *      14.04.2002      added transfer_8to16sub2   *  $Id$
32   *      07.01.2002      merge functions from compensate; rename functions   *
33   *      22.12.2001      transfer_8to8add16 limit fix   ****************************************************************************/
34   *      07.11.2001      initial version; (c)2001 peter ross <pross@cs.rmit.edu.au>  
35    #include "../global.h"
36    #include "mem_transfer.h"
37    
38   *************************************************************************/  /* Function pointers - Initialized in the xvid.c module */
39    
40    TRANSFER_8TO16COPY_PTR transfer_8to16copy;
41    TRANSFER_16TO8COPY_PTR transfer_16to8copy;
42    
43  TRANSFER_8TO16SUB_PTR  transfer_8to16sub;  TRANSFER_8TO16SUB_PTR  transfer_8to16sub;
44  TRANSFER_8TO16SUB2_PTR transfer_8to16sub2;  TRANSFER_8TO16SUB2_PTR transfer_8to16sub2;
45  TRANSFER_16TO8ADD_PTR  transfer_16to8add;  TRANSFER_16TO8ADD_PTR  transfer_16to8add;
46    
47  // function pointers  TRANSFER8X8_COPY_PTR transfer8x8_copy;
48    
49    
50  /*****************************************************************************  /*****************************************************************************
51   *   *
52  TRANSFER_8TO16SUB_PTR transfer_8to16sub;   * All these functions are used to transfer data from a 8 bit data array
53   * to a 16 bit data array.   * to a 16 bit data array.
54  TRANSFER_16TO8ADD_PTR transfer_16to8add;   *
55   * This is typically used during motion compensation, that's why some   * This is typically used during motion compensation, that's why some
56   * functions also do the addition/substraction of another buffer during the   * functions also do the addition/substraction of another buffer during the
57   * so called  transfer.   * so called  transfer.
58   *   *
59     ****************************************************************************/
60    
61    /*
62     * SRC - the source buffer
63     * DST - the destination buffer
64     *
65     * Then the function does the 8->16 bit transfer and this serie of operations :
66     *
67     *    SRC (8bit)  = SRC
68     *    DST (16bit) = SRC
69   */   */
70    void
71    transfer_8to16copy_c(int16_t * const dst,
72                                             const uint8_t * const src,
73                                             uint32_t stride)
74    {
75            uint32_t i, j;
76    
77            for (j = 0; j < 8; j++) {
78                    for (i = 0; i < 8; i++) {
79                          dst[j * 8 + i] = (int16_t) src[j * stride + i];                          dst[j * 8 + i] = (int16_t) src[j * stride + i];
80                  }                  }
81          }          }
# Line 69  Line 90 
90   *    SRC (16bit) = SRC   *    SRC (16bit) = SRC
91   *    DST (8bit)  = max(min(SRC, 255), 0)   *    DST (8bit)  = max(min(SRC, 255), 0)
92   */   */
93    void
94    transfer_16to8copy_c(uint8_t * const dst,
95                                             const int16_t * const src,
96                                             uint32_t stride)
97    {
98            uint32_t i, j;
99    
100            for (j = 0; j < 8; j++) {
101                    for (i = 0; i < 8; i++) {
102                          int16_t pixel = src[j * 8 + i];                          int16_t pixel = src[j * 8 + i];
103    
104                          if (pixel < 0) {                          if (pixel < 0) {
# Line 95  Line 124 
124   *    R   (8bit)  = R   *    R   (8bit)  = R
125   *    C   (8bit)  = R   *    C   (8bit)  = R
126   *    DCT (16bit) = C - R   *    DCT (16bit) = C - R
   perform motion compensation (and 8bit->16bit dct transfer)  
   ... with write back  
127  */  */
128    void
129    transfer_8to16sub_c(int16_t * const dct,
130                                            uint8_t * const cur,
131                                            const uint8_t * ref,
132                                            const uint32_t stride)
133    {
134            uint32_t i, j;
135    
136            for (j = 0; j < 8; j++) {
137                  for (i = 0; i < 8; i++) {                  for (i = 0; i < 8; i++) {
138                          uint8_t c = cur[j * stride + i];                          uint8_t c = cur[j * stride + i];
139                          uint8_t r = ref[j * stride + i];                          uint8_t r = ref[j * stride + i];
# Line 119  Line 155 
155   *   *
156   *    R1  (8bit) = R1   *    R1  (8bit) = R1
157   *    R2  (8bit) = R2   *    R2  (8bit) = R2
158    performs bi motion compensation (and 8bit->16bit dct transfer)   *    C   (8bit) = C
159    .. but does not write back   *    DCT (16bit)= C - min((R1 + R2)/2, 255)
160  */  */
161    void
162    transfer_8to16sub2_c(int16_t * const dct,
163                                             uint8_t * const cur,
164                                             const uint8_t * ref1,
165                                             const uint8_t * ref2,
166                                             const uint32_t stride)
167    {
168            uint32_t i, j;
169    
170          for (j = 0; j < 8; j++) {          for (j = 0; j < 8; j++) {
171                  for (i = 0; i < 8; i++) {                  for (i = 0; i < 8; i++) {
172                          uint8_t c = cur[j * stride + i];                          uint8_t c = cur[j * stride + i];
# Line 146  Line 191 
191   *    SRC (16bit) = SRC   *    SRC (16bit) = SRC
192   *    DST (8bit)  = max(min(DST+SRC, 255), 0)   *    DST (8bit)  = max(min(DST+SRC, 255), 0)
193   */   */
194    void
195    transfer_16to8add_c(uint8_t * const dst,
196                                            const int16_t * const src,
197                                            uint32_t stride)
198    {
199            uint32_t i, j;
200    
201            for (j = 0; j < 8; j++) {
202                    for (i = 0; i < 8; i++) {
203                          int16_t pixel = (int16_t) dst[j * stride + i] + src[j * 8 + i];                          int16_t pixel = (int16_t) dst[j * stride + i] + src[j * 8 + i];
204    
205                          if (pixel < 0) {                          if (pixel < 0) {
# Line 167  Line 221 
221   *    SRC (8bit) = SRC   *    SRC (8bit) = SRC
222   *    DST (8bit) = SRC   *    DST (8bit) = SRC
223   */   */
224    void
225    transfer8x8_copy_c(uint8_t * const dst,
226                                       const uint8_t * const src,
227                                       const uint32_t stride)
228    {
229            uint32_t i, j;
230    
231            for (j = 0; j < 8; j++) {
232                    for (i = 0; i < 8; i++) {
233                          dst[j * stride + i] = src[j * stride + i];                          dst[j * stride + i] = src[j * stride + i];
234                  }                  }
235          }          }
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