filter docs: reference scale and fps filters
[libav.git] / libavcodec / dct32_template.c
1 /*
2 * Template for the Discrete Cosine Transform for 32 samples
3 * Copyright (c) 2001, 2002 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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.
11 *
12 * Libav 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.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "dct32.h"
23 #include "mathops.h"
24
25 #if DCT32_FLOAT
26 # define dct32 ff_dct32_float
27 # define FIXHR(x) ((float)(x))
28 # define MULH3(x, y, s) ((s)*(y)*(x))
29 # define INTFLOAT float
30 #else
31 # define dct32 ff_dct32_fixed
32 # define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5))
33 # define MULH3(x, y, s) MULH((s)*(x), y)
34 # define INTFLOAT int
35 #endif
36
37
38 /* tab[i][j] = 1.0 / (2.0 * cos(pi*(2*k+1) / 2^(6 - j))) */
39
40 /* cos(i*pi/64) */
41
42 #define COS0_0 FIXHR(0.50060299823519630134/2)
43 #define COS0_1 FIXHR(0.50547095989754365998/2)
44 #define COS0_2 FIXHR(0.51544730992262454697/2)
45 #define COS0_3 FIXHR(0.53104259108978417447/2)
46 #define COS0_4 FIXHR(0.55310389603444452782/2)
47 #define COS0_5 FIXHR(0.58293496820613387367/2)
48 #define COS0_6 FIXHR(0.62250412303566481615/2)
49 #define COS0_7 FIXHR(0.67480834145500574602/2)
50 #define COS0_8 FIXHR(0.74453627100229844977/2)
51 #define COS0_9 FIXHR(0.83934964541552703873/2)
52 #define COS0_10 FIXHR(0.97256823786196069369/2)
53 #define COS0_11 FIXHR(1.16943993343288495515/4)
54 #define COS0_12 FIXHR(1.48416461631416627724/4)
55 #define COS0_13 FIXHR(2.05778100995341155085/8)
56 #define COS0_14 FIXHR(3.40760841846871878570/8)
57 #define COS0_15 FIXHR(10.19000812354805681150/32)
58
59 #define COS1_0 FIXHR(0.50241928618815570551/2)
60 #define COS1_1 FIXHR(0.52249861493968888062/2)
61 #define COS1_2 FIXHR(0.56694403481635770368/2)
62 #define COS1_3 FIXHR(0.64682178335999012954/2)
63 #define COS1_4 FIXHR(0.78815462345125022473/2)
64 #define COS1_5 FIXHR(1.06067768599034747134/4)
65 #define COS1_6 FIXHR(1.72244709823833392782/4)
66 #define COS1_7 FIXHR(5.10114861868916385802/16)
67
68 #define COS2_0 FIXHR(0.50979557910415916894/2)
69 #define COS2_1 FIXHR(0.60134488693504528054/2)
70 #define COS2_2 FIXHR(0.89997622313641570463/2)
71 #define COS2_3 FIXHR(2.56291544774150617881/8)
72
73 #define COS3_0 FIXHR(0.54119610014619698439/2)
74 #define COS3_1 FIXHR(1.30656296487637652785/4)
75
76 #define COS4_0 FIXHR(0.70710678118654752439/2)
77
78 /* butterfly operator */
79 #define BF(a, b, c, s)\
80 {\
81 tmp0 = val##a + val##b;\
82 tmp1 = val##a - val##b;\
83 val##a = tmp0;\
84 val##b = MULH3(tmp1, c, 1<<(s));\
85 }
86
87 #define BF0(a, b, c, s)\
88 {\
89 tmp0 = tab[a] + tab[b];\
90 tmp1 = tab[a] - tab[b];\
91 val##a = tmp0;\
92 val##b = MULH3(tmp1, c, 1<<(s));\
93 }
94
95 #define BF1(a, b, c, d)\
96 {\
97 BF(a, b, COS4_0, 1);\
98 BF(c, d,-COS4_0, 1);\
99 val##c += val##d;\
100 }
101
102 #define BF2(a, b, c, d)\
103 {\
104 BF(a, b, COS4_0, 1);\
105 BF(c, d,-COS4_0, 1);\
106 val##c += val##d;\
107 val##a += val##c;\
108 val##c += val##b;\
109 val##b += val##d;\
110 }
111
112 #define ADD(a, b) val##a += val##b
113
114 /* DCT32 without 1/sqrt(2) coef zero scaling. */
115 void dct32(INTFLOAT *out, const INTFLOAT *tab)
116 {
117 INTFLOAT tmp0, tmp1;
118
119 INTFLOAT val0 , val1 , val2 , val3 , val4 , val5 , val6 , val7 ,
120 val8 , val9 , val10, val11, val12, val13, val14, val15,
121 val16, val17, val18, val19, val20, val21, val22, val23,
122 val24, val25, val26, val27, val28, val29, val30, val31;
123
124 /* pass 1 */
125 BF0( 0, 31, COS0_0 , 1);
126 BF0(15, 16, COS0_15, 5);
127 /* pass 2 */
128 BF( 0, 15, COS1_0 , 1);
129 BF(16, 31,-COS1_0 , 1);
130 /* pass 1 */
131 BF0( 7, 24, COS0_7 , 1);
132 BF0( 8, 23, COS0_8 , 1);
133 /* pass 2 */
134 BF( 7, 8, COS1_7 , 4);
135 BF(23, 24,-COS1_7 , 4);
136 /* pass 3 */
137 BF( 0, 7, COS2_0 , 1);
138 BF( 8, 15,-COS2_0 , 1);
139 BF(16, 23, COS2_0 , 1);
140 BF(24, 31,-COS2_0 , 1);
141 /* pass 1 */
142 BF0( 3, 28, COS0_3 , 1);
143 BF0(12, 19, COS0_12, 2);
144 /* pass 2 */
145 BF( 3, 12, COS1_3 , 1);
146 BF(19, 28,-COS1_3 , 1);
147 /* pass 1 */
148 BF0( 4, 27, COS0_4 , 1);
149 BF0(11, 20, COS0_11, 2);
150 /* pass 2 */
151 BF( 4, 11, COS1_4 , 1);
152 BF(20, 27,-COS1_4 , 1);
153 /* pass 3 */
154 BF( 3, 4, COS2_3 , 3);
155 BF(11, 12,-COS2_3 , 3);
156 BF(19, 20, COS2_3 , 3);
157 BF(27, 28,-COS2_3 , 3);
158 /* pass 4 */
159 BF( 0, 3, COS3_0 , 1);
160 BF( 4, 7,-COS3_0 , 1);
161 BF( 8, 11, COS3_0 , 1);
162 BF(12, 15,-COS3_0 , 1);
163 BF(16, 19, COS3_0 , 1);
164 BF(20, 23,-COS3_0 , 1);
165 BF(24, 27, COS3_0 , 1);
166 BF(28, 31,-COS3_0 , 1);
167
168
169
170 /* pass 1 */
171 BF0( 1, 30, COS0_1 , 1);
172 BF0(14, 17, COS0_14, 3);
173 /* pass 2 */
174 BF( 1, 14, COS1_1 , 1);
175 BF(17, 30,-COS1_1 , 1);
176 /* pass 1 */
177 BF0( 6, 25, COS0_6 , 1);
178 BF0( 9, 22, COS0_9 , 1);
179 /* pass 2 */
180 BF( 6, 9, COS1_6 , 2);
181 BF(22, 25,-COS1_6 , 2);
182 /* pass 3 */
183 BF( 1, 6, COS2_1 , 1);
184 BF( 9, 14,-COS2_1 , 1);
185 BF(17, 22, COS2_1 , 1);
186 BF(25, 30,-COS2_1 , 1);
187
188 /* pass 1 */
189 BF0( 2, 29, COS0_2 , 1);
190 BF0(13, 18, COS0_13, 3);
191 /* pass 2 */
192 BF( 2, 13, COS1_2 , 1);
193 BF(18, 29,-COS1_2 , 1);
194 /* pass 1 */
195 BF0( 5, 26, COS0_5 , 1);
196 BF0(10, 21, COS0_10, 1);
197 /* pass 2 */
198 BF( 5, 10, COS1_5 , 2);
199 BF(21, 26,-COS1_5 , 2);
200 /* pass 3 */
201 BF( 2, 5, COS2_2 , 1);
202 BF(10, 13,-COS2_2 , 1);
203 BF(18, 21, COS2_2 , 1);
204 BF(26, 29,-COS2_2 , 1);
205 /* pass 4 */
206 BF( 1, 2, COS3_1 , 2);
207 BF( 5, 6,-COS3_1 , 2);
208 BF( 9, 10, COS3_1 , 2);
209 BF(13, 14,-COS3_1 , 2);
210 BF(17, 18, COS3_1 , 2);
211 BF(21, 22,-COS3_1 , 2);
212 BF(25, 26, COS3_1 , 2);
213 BF(29, 30,-COS3_1 , 2);
214
215 /* pass 5 */
216 BF1( 0, 1, 2, 3);
217 BF2( 4, 5, 6, 7);
218 BF1( 8, 9, 10, 11);
219 BF2(12, 13, 14, 15);
220 BF1(16, 17, 18, 19);
221 BF2(20, 21, 22, 23);
222 BF1(24, 25, 26, 27);
223 BF2(28, 29, 30, 31);
224
225 /* pass 6 */
226
227 ADD( 8, 12);
228 ADD(12, 10);
229 ADD(10, 14);
230 ADD(14, 9);
231 ADD( 9, 13);
232 ADD(13, 11);
233 ADD(11, 15);
234
235 out[ 0] = val0;
236 out[16] = val1;
237 out[ 8] = val2;
238 out[24] = val3;
239 out[ 4] = val4;
240 out[20] = val5;
241 out[12] = val6;
242 out[28] = val7;
243 out[ 2] = val8;
244 out[18] = val9;
245 out[10] = val10;
246 out[26] = val11;
247 out[ 6] = val12;
248 out[22] = val13;
249 out[14] = val14;
250 out[30] = val15;
251
252 ADD(24, 28);
253 ADD(28, 26);
254 ADD(26, 30);
255 ADD(30, 25);
256 ADD(25, 29);
257 ADD(29, 27);
258 ADD(27, 31);
259
260 out[ 1] = val16 + val24;
261 out[17] = val17 + val25;
262 out[ 9] = val18 + val26;
263 out[25] = val19 + val27;
264 out[ 5] = val20 + val28;
265 out[21] = val21 + val29;
266 out[13] = val22 + val30;
267 out[29] = val23 + val31;
268 out[ 3] = val24 + val20;
269 out[19] = val25 + val21;
270 out[11] = val26 + val22;
271 out[27] = val27 + val23;
272 out[ 7] = val28 + val18;
273 out[23] = val29 + val19;
274 out[15] = val30 + val17;
275 out[31] = val31;
276 }