[cvs] / xvidcore / src / image / reduced.c Repository:
ViewVC logotype

Diff of /xvidcore/src/image/reduced.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 1.1, Sun Dec 8 05:34:16 2002 UTC revision 1.1.2.2, Mon Dec 9 10:47:05 2002 UTC
# Line 0  Line 1 
1    /*****************************************************************************
2     *
3     *  XVID MPEG-4 VIDEO CODEC
4     *   Reduced-Resolution utilities
5     *
6     *  Copyright(C) 2002 Pascal Massimino <skal@planet-d.net>
7     *
8     *  This file is part of XviD, a free MPEG-4 video encoder/decoder
9     *
10     *  XviD is free software; you can redistribute it and/or modify it
11     *  under the terms of the GNU General Public License as published by
12     *  the Free Software Foundation; either version 2 of the License, or
13     *  (at your option) any later version.
14     *
15     *  This program is distributed in the hope that it will be useful,
16     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18     *  GNU General Public License for more details.
19     *
20     *  You should have received a copy of the GNU General Public License
21     *  along with this program; if not, write to the Free Software
22     *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
23     *
24     *  Under section 8 of the GNU General Public License, the copyright
25     *  holders of XVID explicitly forbid distribution in the following
26     *  countries:
27     *
28     *    - Japan
29     *    - United States of America
30     *
31     *  Linking XviD statically or dynamically with other modules is making a
32     *  combined work based on XviD.  Thus, the terms and conditions of the
33     *  GNU General Public License cover the whole combination.
34     *
35     *  As a special exception, the copyright holders of XviD give you
36     *  permission to link XviD with independent modules that communicate with
37     *  XviD solely through the VFW1.1 and DShow interfaces, regardless of the
38     *  license terms of these independent modules, and to copy and distribute
39     *  the resulting combined work under terms of your choice, provided that
40     *  every copy of the combined work is accompanied by a complete copy of
41     *  the source code of XviD (the version of XviD used to produce the
42     *  combined work), being distributed under the terms of the GNU General
43     *  Public License plus this exception.  An independent module is a module
44     *  which is not derived from or based on XviD.
45     *
46     *  Note that people who make modified versions of XviD are not obligated
47     *  to grant this special exception for their modified versions; it is
48     *  their choice whether to do so.  The GNU General Public License gives
49     *  permission to release a modified version without this exception; this
50     *  exception also makes it possible to release a modified version which
51     *  carries forward this exception.
52     *
53     * $Id$
54     *
55     ****************************************************************************/
56    
57    #include "../portab.h"
58    #include "reduced.h"
59    
60    // function pointers
61    COPY_UPSAMPLED_8X8_16TO8 * copy_upsampled_8x8_16to8;
62    ADD_UPSAMPLED_8X8_16TO8 * add_upsampled_8x8_16to8;
63    VFILTER_31 * vfilter_31;
64    HFILTER_31 * hfilter_31;
65    FILTER_18X18_TO_8X8 * filter_18x18_to_8x8;
66    FILTER_DIFF_18X18_TO_8X8 * filter_diff_18x18_to_8x8;
67    
68    //////////////////////////////////////////////////////////
69    // Upsampling (1/3/3/1) filter
70    
71    #define CLIP(x) ((x)<0 ? 0 : (x)>255 ? 255 : (x))
72    #define ADD(dst,src)  (dst) = CLIP((dst)+(src))
73    
74    static __inline void Filter_31(uint8_t *Dst1, uint8_t *Dst2,
75                                 const int16_t *Src1, const int16_t *Src2)
76    {
77        /* Src[] is assumed to be >=0. So we can use ">>2" instead of "/2" */
78      int16_t a = (3*Src1[0]+  Src2[0]+2) >> 2;
79      int16_t b = (  Src1[0]+3*Src2[0]+2) >> 2;
80      Dst1[0] = CLIP(a);
81      Dst2[0] = CLIP(b);
82    }
83    
84    static __inline void Filter_9331(uint8_t *Dst1, uint8_t *Dst2,
85                                   const int16_t *Src1, const int16_t *Src2)
86    {
87        /* Src[] is assumed to be >=0. So we can use ">>4" instead of "/16" */
88      int16_t a = (9*Src1[0]+  3*Src1[1]+ 3*Src2[0] + 1*Src2[1] + 8) >> 4;
89      int16_t b = (3*Src1[0]+  9*Src1[1]+ 1*Src2[0] + 3*Src2[1] + 8) >> 4;
90      int16_t c = (3*Src1[0]+  1*Src1[1]+ 9*Src2[0] + 3*Src2[1] + 8) >> 4;
91      int16_t d = (1*Src1[0]+  3*Src1[1]+ 3*Src2[0] + 9*Src2[1] + 8) >> 4;
92      Dst1[0] = CLIP(a);
93      Dst1[1] = CLIP(b);
94      Dst2[0] = CLIP(c);
95      Dst2[1] = CLIP(d);
96    }
97    
98    void xvid_Copy_Upsampled_8x8_16To8_C(uint8_t *Dst, const int16_t *Src, const int BpS)
99    {
100      int x, y;
101    
102      Dst[0] = CLIP(Src[0]);
103      for(x=0; x<7; ++x) Filter_31(Dst+2*x+1, Dst+2*x+2, Src+x, Src+x+1);
104      Dst[15] = CLIP(Src[7]);
105      Dst += BpS;
106      for(y=0; y<7; ++y) {
107        uint8_t *const Dst2 = Dst + BpS;
108        Filter_31(Dst, Dst2, Src, Src+8);
109        for(x=0; x<7; ++x)
110          Filter_9331(Dst+2*x+1, Dst2+2*x+1, Src+x, Src+x+8);
111        Filter_31(Dst+15, Dst2+15, Src+7, Src+7+8);
112        Src += 8;
113        Dst += 2*BpS;
114      }
115      Dst[0] = CLIP(Src[0]);
116      for(x=0; x<7; ++x) Filter_31(Dst+2*x+1, Dst+2*x+2, Src+x, Src+x+1);
117      Dst[15] = CLIP(Src[7]);
118    }
119    
120    static __inline void Filter_Add_31(uint8_t *Dst1, uint8_t *Dst2,
121                                 const int16_t *Src1, const int16_t *Src2)
122    {
123        /* Here, we must use "/4", since Src[] is in [-256, 255] */
124      int16_t a = (3*Src1[0]+  Src2[0] + 2) / 4;
125      int16_t b = (  Src1[0]+3*Src2[0] + 2) / 4;
126      ADD(Dst1[0], a);
127      ADD(Dst2[0], b);
128    }
129    
130    static __inline void Filter_Add_9331(uint8_t *Dst1, uint8_t *Dst2,
131                                       const int16_t *Src1, const int16_t *Src2)
132    {
133      int16_t a = (9*Src1[0]+  3*Src1[1]+ 3*Src2[0] + 1*Src2[1] + 8) / 16;
134      int16_t b = (3*Src1[0]+  9*Src1[1]+ 1*Src2[0] + 3*Src2[1] + 8) / 16;
135      int16_t c = (3*Src1[0]+  1*Src1[1]+ 9*Src2[0] + 3*Src2[1] + 8) / 16;
136      int16_t d = (1*Src1[0]+  3*Src1[1]+ 3*Src2[0] + 9*Src2[1] + 8) / 16;
137      ADD(Dst1[0], a);
138      ADD(Dst1[1], b);
139      ADD(Dst2[0], c);
140      ADD(Dst2[1], d);
141    }
142    
143    void xvid_Add_Upsampled_8x8_16To8_C(uint8_t *Dst, const int16_t *Src, const int BpS)
144    {
145      int x, y;
146    
147      ADD(Dst[0], Src[0]);
148      for(x=0; x<7; ++x) Filter_Add_31(Dst+2*x+1, Dst+2*x+2, Src+x, Src+x+1);
149      ADD(Dst[15], Src[7]);
150      Dst += BpS;
151      for(y=0; y<7; ++y) {
152        uint8_t *const Dst2 = Dst + BpS;
153        Filter_Add_31(Dst, Dst2, Src, Src+8);
154        for(x=0; x<7; ++x)
155          Filter_Add_9331(Dst+2*x+1, Dst2+2*x+1, Src+x, Src+x+8);
156        Filter_Add_31(Dst+15, Dst2+15, Src+7, Src+7+8);
157        Src += 8;
158        Dst += 2*BpS;
159      }
160      ADD(Dst[0], Src[0]);
161      for(x=0; x<7; ++x) Filter_Add_31(Dst+2*x+1, Dst+2*x+2, Src+x, Src+x+1);
162      ADD(Dst[15], Src[7]);
163    }
164    #undef CLIP
165    #undef ADD
166    
167    //////////////////////////////////////////////////////////
168    // horizontal and vertical deblocking
169    
170    void xvid_HFilter_31_C(uint8_t *Src1, uint8_t *Src2, int Nb_Blks)
171    {
172      Nb_Blks *= 8;
173      while(Nb_Blks-->0) {
174        uint8_t a = ( 3*Src1[0] + 1*Src2[0] + 2 ) >> 2;
175        uint8_t b = ( 1*Src1[0] + 3*Src2[0] + 2 ) >> 2;
176        *Src1++ = a;
177        *Src2++ = b;
178      }
179    }
180    
181    void xvid_VFilter_31_C(uint8_t *Src1, uint8_t *Src2, const int BpS, int Nb_Blks)
182    {
183      Nb_Blks *= 8;
184      while(Nb_Blks-->0) {
185        uint8_t a = ( 3*Src1[0] + 1*Src2[0] + 2 ) >> 2;
186        uint8_t b = ( 1*Src1[0] + 3*Src2[0] + 2 ) >> 2;
187        *Src1 = a;
188        *Src2 = b;
189        Src1 += BpS;
190        Src2 += BpS;
191      }
192    }
193    
194    //////////////////////////////////////////////////////////
195    // 16x16 -> 8x8  (1/3/3/1) downsampling
196    //
197    // Warning! These read 1 pixel outside of the input 16x16 block!
198    //
199    //////////////////////////////////////////////////////////
200    
201    void xvid_Filter_18x18_To_8x8_C(int16_t *Dst, const uint8_t *Src, const int BpS)
202    {
203      int16_t *T, Tmp[18*8];
204      int i, j;
205    
206      T = Tmp;
207      Src -= BpS;
208      for(j=-1; j<17; j++) {
209        for(i=0; i<8; ++i)
210          T[i] = Src[2*i-1] + 3*Src[2*i+0] + 3*Src[2*i+1] + Src[2*i+2];
211        T += 8;
212        Src += BpS;
213      }
214      T = Tmp + 8;
215      for(j=0; j<8; j++) {
216        for(i=0; i<8; ++i)
217          Dst[i] = ( T[-8+i] + 3*T[0+i] + 3*T[8+i] + T[16+i] + 32 ) / 64;
218        Dst += 8;
219        T += 16;
220      }
221    }
222    
223    void xvid_Filter_Diff_18x18_To_8x8_C(int16_t *Dst, const uint8_t *Src, const int BpS)
224    {
225      int16_t *T, Tmp[18*8];
226      int i, j;
227    
228      T = Tmp;
229      Src -= BpS;
230      for(j=-1; j<17; j++) {
231        for(i=0; i<8; ++i)
232          T[i] = Src[2*i-1] + 3*Src[2*i+0] + 3*Src[2*i+1] + Src[2*i+2];
233        T += 8;
234        Src += BpS;
235      }
236      T = Tmp;
237      for(j=0; j<8; j++) {
238        for(i=0; i<8; ++i)
239          Dst[i] -= ( T[i] + 3*T[8+i] + 3*T[16+i] + T[24+i] + 32 ) / 64;
240        Dst += 8;
241        T += 16;
242      }
243    }
244    
245    //////////////////////////////////////////////////////////
Legend:
Removed from v.1.1  
changed lines
  Added in v.1.1.2.2
No admin address has been configured
 ViewVC Help
Powered by ViewVC 1.0.4