Move #defines that are mostly used in h264.c out of h264data.h and into h264.h.
[FFMpeg-mirror/ffmpeg-vdpau.git] / libavcodec / h264idct.c
blob571e2e91d17eafec7eec856afd2bbea44a52a29d
1 /*
2 * H.264 IDCT
3 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 /**
23 * @file h264-idct.c
24 * H.264 IDCT.
25 * @author Michael Niedermayer <michaelni@gmx.at>
28 #include "dsputil.h"
30 static av_always_inline void idct_internal(uint8_t *dst, DCTELEM *block, int stride, int block_stride, int shift, int add){
31 int i;
32 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
34 block[0] += 1<<(shift-1);
36 for(i=0; i<4; i++){
37 const int z0= block[0 + block_stride*i] + block[2 + block_stride*i];
38 const int z1= block[0 + block_stride*i] - block[2 + block_stride*i];
39 const int z2= (block[1 + block_stride*i]>>1) - block[3 + block_stride*i];
40 const int z3= block[1 + block_stride*i] + (block[3 + block_stride*i]>>1);
42 block[0 + block_stride*i]= z0 + z3;
43 block[1 + block_stride*i]= z1 + z2;
44 block[2 + block_stride*i]= z1 - z2;
45 block[3 + block_stride*i]= z0 - z3;
48 for(i=0; i<4; i++){
49 const int z0= block[i + block_stride*0] + block[i + block_stride*2];
50 const int z1= block[i + block_stride*0] - block[i + block_stride*2];
51 const int z2= (block[i + block_stride*1]>>1) - block[i + block_stride*3];
52 const int z3= block[i + block_stride*1] + (block[i + block_stride*3]>>1);
54 dst[i + 0*stride]= cm[ add*dst[i + 0*stride] + ((z0 + z3) >> shift) ];
55 dst[i + 1*stride]= cm[ add*dst[i + 1*stride] + ((z1 + z2) >> shift) ];
56 dst[i + 2*stride]= cm[ add*dst[i + 2*stride] + ((z1 - z2) >> shift) ];
57 dst[i + 3*stride]= cm[ add*dst[i + 3*stride] + ((z0 - z3) >> shift) ];
61 void ff_h264_idct_add_c(uint8_t *dst, DCTELEM *block, int stride){
62 idct_internal(dst, block, stride, 4, 6, 1);
65 void ff_h264_lowres_idct_add_c(uint8_t *dst, int stride, DCTELEM *block){
66 idct_internal(dst, block, stride, 8, 3, 1);
69 void ff_h264_lowres_idct_put_c(uint8_t *dst, int stride, DCTELEM *block){
70 idct_internal(dst, block, stride, 8, 3, 0);
73 void ff_h264_idct8_add_c(uint8_t *dst, DCTELEM *block, int stride){
74 int i;
75 DCTELEM (*src)[8] = (DCTELEM(*)[8])block;
76 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
78 block[0] += 32;
80 for( i = 0; i < 8; i++ )
82 const int a0 = src[i][0] + src[i][4];
83 const int a2 = src[i][0] - src[i][4];
84 const int a4 = (src[i][2]>>1) - src[i][6];
85 const int a6 = (src[i][6]>>1) + src[i][2];
87 const int b0 = a0 + a6;
88 const int b2 = a2 + a4;
89 const int b4 = a2 - a4;
90 const int b6 = a0 - a6;
92 const int a1 = -src[i][3] + src[i][5] - src[i][7] - (src[i][7]>>1);
93 const int a3 = src[i][1] + src[i][7] - src[i][3] - (src[i][3]>>1);
94 const int a5 = -src[i][1] + src[i][7] + src[i][5] + (src[i][5]>>1);
95 const int a7 = src[i][3] + src[i][5] + src[i][1] + (src[i][1]>>1);
97 const int b1 = (a7>>2) + a1;
98 const int b3 = a3 + (a5>>2);
99 const int b5 = (a3>>2) - a5;
100 const int b7 = a7 - (a1>>2);
102 src[i][0] = b0 + b7;
103 src[i][7] = b0 - b7;
104 src[i][1] = b2 + b5;
105 src[i][6] = b2 - b5;
106 src[i][2] = b4 + b3;
107 src[i][5] = b4 - b3;
108 src[i][3] = b6 + b1;
109 src[i][4] = b6 - b1;
111 for( i = 0; i < 8; i++ )
113 const int a0 = src[0][i] + src[4][i];
114 const int a2 = src[0][i] - src[4][i];
115 const int a4 = (src[2][i]>>1) - src[6][i];
116 const int a6 = (src[6][i]>>1) + src[2][i];
118 const int b0 = a0 + a6;
119 const int b2 = a2 + a4;
120 const int b4 = a2 - a4;
121 const int b6 = a0 - a6;
123 const int a1 = -src[3][i] + src[5][i] - src[7][i] - (src[7][i]>>1);
124 const int a3 = src[1][i] + src[7][i] - src[3][i] - (src[3][i]>>1);
125 const int a5 = -src[1][i] + src[7][i] + src[5][i] + (src[5][i]>>1);
126 const int a7 = src[3][i] + src[5][i] + src[1][i] + (src[1][i]>>1);
128 const int b1 = (a7>>2) + a1;
129 const int b3 = a3 + (a5>>2);
130 const int b5 = (a3>>2) - a5;
131 const int b7 = a7 - (a1>>2);
133 dst[i + 0*stride] = cm[ dst[i + 0*stride] + ((b0 + b7) >> 6) ];
134 dst[i + 1*stride] = cm[ dst[i + 1*stride] + ((b2 + b5) >> 6) ];
135 dst[i + 2*stride] = cm[ dst[i + 2*stride] + ((b4 + b3) >> 6) ];
136 dst[i + 3*stride] = cm[ dst[i + 3*stride] + ((b6 + b1) >> 6) ];
137 dst[i + 4*stride] = cm[ dst[i + 4*stride] + ((b6 - b1) >> 6) ];
138 dst[i + 5*stride] = cm[ dst[i + 5*stride] + ((b4 - b3) >> 6) ];
139 dst[i + 6*stride] = cm[ dst[i + 6*stride] + ((b2 - b5) >> 6) ];
140 dst[i + 7*stride] = cm[ dst[i + 7*stride] + ((b0 - b7) >> 6) ];
144 // assumes all AC coefs are 0
145 void ff_h264_idct_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){
146 int i, j;
147 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
148 int dc = (block[0] + 32) >> 6;
149 for( j = 0; j < 4; j++ )
151 for( i = 0; i < 4; i++ )
152 dst[i] = cm[ dst[i] + dc ];
153 dst += stride;
157 void ff_h264_idct8_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){
158 int i, j;
159 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
160 int dc = (block[0] + 32) >> 6;
161 for( j = 0; j < 8; j++ )
163 for( i = 0; i < 8; i++ )
164 dst[i] = cm[ dst[i] + dc ];
165 dst += stride;