Mercurial > SDL_sound_CoreAudio

comparison decoders/mpglib/dct64_i386.c @ 261:9b6e82f7c853

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Initial add.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 21 Feb 2002 19:46:09 +0000
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260:44a4730a1e6f 261:9b6e82f7c853
1
2 /*
3 * Discrete Cosine Tansform (DCT) for subband synthesis
4 * optimized for machines with no auto-increment.
5 * The performance is highly compiler dependend. Maybe
6 * the dct64.c version for 'normal' processor may be faster
7 * even for Intel processors.
8 */
9
10 #include "mpg123_sdlsound.h"
11
12 static void dct64_1(real *out0,real *out1,real *b1,real *b2,real *samples)
13 {
14
15 {
16 register real *costab = pnts[0];
17
18 b1[0x00] = samples[0x00] + samples[0x1F];
19 b1[0x1F] = (samples[0x00] - samples[0x1F]) * costab[0x0];
20
21 b1[0x01] = samples[0x01] + samples[0x1E];
22 b1[0x1E] = (samples[0x01] - samples[0x1E]) * costab[0x1];
23
24 b1[0x02] = samples[0x02] + samples[0x1D];
25 b1[0x1D] = (samples[0x02] - samples[0x1D]) * costab[0x2];
26
27 b1[0x03] = samples[0x03] + samples[0x1C];
28 b1[0x1C] = (samples[0x03] - samples[0x1C]) * costab[0x3];
29
30 b1[0x04] = samples[0x04] + samples[0x1B];
31 b1[0x1B] = (samples[0x04] - samples[0x1B]) * costab[0x4];
32
33 b1[0x05] = samples[0x05] + samples[0x1A];
34 b1[0x1A] = (samples[0x05] - samples[0x1A]) * costab[0x5];
35
36 b1[0x06] = samples[0x06] + samples[0x19];
37 b1[0x19] = (samples[0x06] - samples[0x19]) * costab[0x6];
38
39 b1[0x07] = samples[0x07] + samples[0x18];
40 b1[0x18] = (samples[0x07] - samples[0x18]) * costab[0x7];
41
42 b1[0x08] = samples[0x08] + samples[0x17];
43 b1[0x17] = (samples[0x08] - samples[0x17]) * costab[0x8];
44
45 b1[0x09] = samples[0x09] + samples[0x16];
46 b1[0x16] = (samples[0x09] - samples[0x16]) * costab[0x9];
47
48 b1[0x0A] = samples[0x0A] + samples[0x15];
49 b1[0x15] = (samples[0x0A] - samples[0x15]) * costab[0xA];
50
51 b1[0x0B] = samples[0x0B] + samples[0x14];
52 b1[0x14] = (samples[0x0B] - samples[0x14]) * costab[0xB];
53
54 b1[0x0C] = samples[0x0C] + samples[0x13];
55 b1[0x13] = (samples[0x0C] - samples[0x13]) * costab[0xC];
56
57 b1[0x0D] = samples[0x0D] + samples[0x12];
58 b1[0x12] = (samples[0x0D] - samples[0x12]) * costab[0xD];
59
60 b1[0x0E] = samples[0x0E] + samples[0x11];
61 b1[0x11] = (samples[0x0E] - samples[0x11]) * costab[0xE];
62
63 b1[0x0F] = samples[0x0F] + samples[0x10];
64 b1[0x10] = (samples[0x0F] - samples[0x10]) * costab[0xF];
65 }
66
67
68 {
69 register real *costab = pnts[1];
70
71 b2[0x00] = b1[0x00] + b1[0x0F];
72 b2[0x0F] = (b1[0x00] - b1[0x0F]) * costab[0];
73 b2[0x01] = b1[0x01] + b1[0x0E];
74 b2[0x0E] = (b1[0x01] - b1[0x0E]) * costab[1];
75 b2[0x02] = b1[0x02] + b1[0x0D];
76 b2[0x0D] = (b1[0x02] - b1[0x0D]) * costab[2];
77 b2[0x03] = b1[0x03] + b1[0x0C];
78 b2[0x0C] = (b1[0x03] - b1[0x0C]) * costab[3];
79 b2[0x04] = b1[0x04] + b1[0x0B];
80 b2[0x0B] = (b1[0x04] - b1[0x0B]) * costab[4];
81 b2[0x05] = b1[0x05] + b1[0x0A];
82 b2[0x0A] = (b1[0x05] - b1[0x0A]) * costab[5];
83 b2[0x06] = b1[0x06] + b1[0x09];
84 b2[0x09] = (b1[0x06] - b1[0x09]) * costab[6];
85 b2[0x07] = b1[0x07] + b1[0x08];
86 b2[0x08] = (b1[0x07] - b1[0x08]) * costab[7];
87
88 b2[0x10] = b1[0x10] + b1[0x1F];
89 b2[0x1F] = (b1[0x1F] - b1[0x10]) * costab[0];
90 b2[0x11] = b1[0x11] + b1[0x1E];
91 b2[0x1E] = (b1[0x1E] - b1[0x11]) * costab[1];
92 b2[0x12] = b1[0x12] + b1[0x1D];
93 b2[0x1D] = (b1[0x1D] - b1[0x12]) * costab[2];
94 b2[0x13] = b1[0x13] + b1[0x1C];
95 b2[0x1C] = (b1[0x1C] - b1[0x13]) * costab[3];
96 b2[0x14] = b1[0x14] + b1[0x1B];
97 b2[0x1B] = (b1[0x1B] - b1[0x14]) * costab[4];
98 b2[0x15] = b1[0x15] + b1[0x1A];
99 b2[0x1A] = (b1[0x1A] - b1[0x15]) * costab[5];
100 b2[0x16] = b1[0x16] + b1[0x19];
101 b2[0x19] = (b1[0x19] - b1[0x16]) * costab[6];
102 b2[0x17] = b1[0x17] + b1[0x18];
103 b2[0x18] = (b1[0x18] - b1[0x17]) * costab[7];
104 }
105
106 {
107 register real *costab = pnts[2];
108
109 b1[0x00] = b2[0x00] + b2[0x07];
110 b1[0x07] = (b2[0x00] - b2[0x07]) * costab[0];
111 b1[0x01] = b2[0x01] + b2[0x06];
112 b1[0x06] = (b2[0x01] - b2[0x06]) * costab[1];
113 b1[0x02] = b2[0x02] + b2[0x05];
114 b1[0x05] = (b2[0x02] - b2[0x05]) * costab[2];
115 b1[0x03] = b2[0x03] + b2[0x04];
116 b1[0x04] = (b2[0x03] - b2[0x04]) * costab[3];
117
118 b1[0x08] = b2[0x08] + b2[0x0F];
119 b1[0x0F] = (b2[0x0F] - b2[0x08]) * costab[0];
120 b1[0x09] = b2[0x09] + b2[0x0E];
121 b1[0x0E] = (b2[0x0E] - b2[0x09]) * costab[1];
122 b1[0x0A] = b2[0x0A] + b2[0x0D];
123 b1[0x0D] = (b2[0x0D] - b2[0x0A]) * costab[2];
124 b1[0x0B] = b2[0x0B] + b2[0x0C];
125 b1[0x0C] = (b2[0x0C] - b2[0x0B]) * costab[3];
126
127 b1[0x10] = b2[0x10] + b2[0x17];
128 b1[0x17] = (b2[0x10] - b2[0x17]) * costab[0];
129 b1[0x11] = b2[0x11] + b2[0x16];
130 b1[0x16] = (b2[0x11] - b2[0x16]) * costab[1];
131 b1[0x12] = b2[0x12] + b2[0x15];
132 b1[0x15] = (b2[0x12] - b2[0x15]) * costab[2];
133 b1[0x13] = b2[0x13] + b2[0x14];
134 b1[0x14] = (b2[0x13] - b2[0x14]) * costab[3];
135
136 b1[0x18] = b2[0x18] + b2[0x1F];
137 b1[0x1F] = (b2[0x1F] - b2[0x18]) * costab[0];
138 b1[0x19] = b2[0x19] + b2[0x1E];
139 b1[0x1E] = (b2[0x1E] - b2[0x19]) * costab[1];
140 b1[0x1A] = b2[0x1A] + b2[0x1D];
141 b1[0x1D] = (b2[0x1D] - b2[0x1A]) * costab[2];
142 b1[0x1B] = b2[0x1B] + b2[0x1C];
143 b1[0x1C] = (b2[0x1C] - b2[0x1B]) * costab[3];
144 }
145
146 {
147 register real const cos0 = pnts[3][0];
148 register real const cos1 = pnts[3][1];
149
150 b2[0x00] = b1[0x00] + b1[0x03];
151 b2[0x03] = (b1[0x00] - b1[0x03]) * cos0;
152 b2[0x01] = b1[0x01] + b1[0x02];
153 b2[0x02] = (b1[0x01] - b1[0x02]) * cos1;
154
155 b2[0x04] = b1[0x04] + b1[0x07];
156 b2[0x07] = (b1[0x07] - b1[0x04]) * cos0;
157 b2[0x05] = b1[0x05] + b1[0x06];
158 b2[0x06] = (b1[0x06] - b1[0x05]) * cos1;
159
160 b2[0x08] = b1[0x08] + b1[0x0B];
161 b2[0x0B] = (b1[0x08] - b1[0x0B]) * cos0;
162 b2[0x09] = b1[0x09] + b1[0x0A];
163 b2[0x0A] = (b1[0x09] - b1[0x0A]) * cos1;
164
165 b2[0x0C] = b1[0x0C] + b1[0x0F];
166 b2[0x0F] = (b1[0x0F] - b1[0x0C]) * cos0;
167 b2[0x0D] = b1[0x0D] + b1[0x0E];
168 b2[0x0E] = (b1[0x0E] - b1[0x0D]) * cos1;
169
170 b2[0x10] = b1[0x10] + b1[0x13];
171 b2[0x13] = (b1[0x10] - b1[0x13]) * cos0;
172 b2[0x11] = b1[0x11] + b1[0x12];
173 b2[0x12] = (b1[0x11] - b1[0x12]) * cos1;
174
175 b2[0x14] = b1[0x14] + b1[0x17];
176 b2[0x17] = (b1[0x17] - b1[0x14]) * cos0;
177 b2[0x15] = b1[0x15] + b1[0x16];
178 b2[0x16] = (b1[0x16] - b1[0x15]) * cos1;
179
180 b2[0x18] = b1[0x18] + b1[0x1B];
181 b2[0x1B] = (b1[0x18] - b1[0x1B]) * cos0;
182 b2[0x19] = b1[0x19] + b1[0x1A];
183 b2[0x1A] = (b1[0x19] - b1[0x1A]) * cos1;
184
185 b2[0x1C] = b1[0x1C] + b1[0x1F];
186 b2[0x1F] = (b1[0x1F] - b1[0x1C]) * cos0;
187 b2[0x1D] = b1[0x1D] + b1[0x1E];
188 b2[0x1E] = (b1[0x1E] - b1[0x1D]) * cos1;
189 }
190
191 {
192 register real const cos0 = pnts[4][0];
193
194 b1[0x00] = b2[0x00] + b2[0x01];
195 b1[0x01] = (b2[0x00] - b2[0x01]) * cos0;
196 b1[0x02] = b2[0x02] + b2[0x03];
197 b1[0x03] = (b2[0x03] - b2[0x02]) * cos0;
198 b1[0x02] += b1[0x03];
199
200 b1[0x04] = b2[0x04] + b2[0x05];
201 b1[0x05] = (b2[0x04] - b2[0x05]) * cos0;
202 b1[0x06] = b2[0x06] + b2[0x07];
203 b1[0x07] = (b2[0x07] - b2[0x06]) * cos0;
204 b1[0x06] += b1[0x07];
205 b1[0x04] += b1[0x06];
206 b1[0x06] += b1[0x05];
207 b1[0x05] += b1[0x07];
208
209 b1[0x08] = b2[0x08] + b2[0x09];
210 b1[0x09] = (b2[0x08] - b2[0x09]) * cos0;
211 b1[0x0A] = b2[0x0A] + b2[0x0B];
212 b1[0x0B] = (b2[0x0B] - b2[0x0A]) * cos0;
213 b1[0x0A] += b1[0x0B];
214
215 b1[0x0C] = b2[0x0C] + b2[0x0D];
216 b1[0x0D] = (b2[0x0C] - b2[0x0D]) * cos0;
217 b1[0x0E] = b2[0x0E] + b2[0x0F];
218 b1[0x0F] = (b2[0x0F] - b2[0x0E]) * cos0;
219 b1[0x0E] += b1[0x0F];
220 b1[0x0C] += b1[0x0E];
221 b1[0x0E] += b1[0x0D];
222 b1[0x0D] += b1[0x0F];
223
224 b1[0x10] = b2[0x10] + b2[0x11];
225 b1[0x11] = (b2[0x10] - b2[0x11]) * cos0;
226 b1[0x12] = b2[0x12] + b2[0x13];
227 b1[0x13] = (b2[0x13] - b2[0x12]) * cos0;
228 b1[0x12] += b1[0x13];
229
230 b1[0x14] = b2[0x14] + b2[0x15];
231 b1[0x15] = (b2[0x14] - b2[0x15]) * cos0;
232 b1[0x16] = b2[0x16] + b2[0x17];
233 b1[0x17] = (b2[0x17] - b2[0x16]) * cos0;
234 b1[0x16] += b1[0x17];
235 b1[0x14] += b1[0x16];
236 b1[0x16] += b1[0x15];
237 b1[0x15] += b1[0x17];
238
239 b1[0x18] = b2[0x18] + b2[0x19];
240 b1[0x19] = (b2[0x18] - b2[0x19]) * cos0;
241 b1[0x1A] = b2[0x1A] + b2[0x1B];
242 b1[0x1B] = (b2[0x1B] - b2[0x1A]) * cos0;
243 b1[0x1A] += b1[0x1B];
244
245 b1[0x1C] = b2[0x1C] + b2[0x1D];
246 b1[0x1D] = (b2[0x1C] - b2[0x1D]) * cos0;
247 b1[0x1E] = b2[0x1E] + b2[0x1F];
248 b1[0x1F] = (b2[0x1F] - b2[0x1E]) * cos0;
249 b1[0x1E] += b1[0x1F];
250 b1[0x1C] += b1[0x1E];
251 b1[0x1E] += b1[0x1D];
252 b1[0x1D] += b1[0x1F];
253 }
254
255 out0[0x10*16] = b1[0x00];
256 out0[0x10*12] = b1[0x04];
257 out0[0x10* 8] = b1[0x02];
258 out0[0x10* 4] = b1[0x06];
259 out0[0x10* 0] = b1[0x01];
260 out1[0x10* 0] = b1[0x01];
261 out1[0x10* 4] = b1[0x05];
262 out1[0x10* 8] = b1[0x03];
263 out1[0x10*12] = b1[0x07];
264
265 b1[0x08] += b1[0x0C];
266 out0[0x10*14] = b1[0x08];
267 b1[0x0C] += b1[0x0a];
268 out0[0x10*10] = b1[0x0C];
269 b1[0x0A] += b1[0x0E];
270 out0[0x10* 6] = b1[0x0A];
271 b1[0x0E] += b1[0x09];
272 out0[0x10* 2] = b1[0x0E];
273 b1[0x09] += b1[0x0D];
274 out1[0x10* 2] = b1[0x09];
275 b1[0x0D] += b1[0x0B];
276 out1[0x10* 6] = b1[0x0D];
277 b1[0x0B] += b1[0x0F];
278 out1[0x10*10] = b1[0x0B];
279 out1[0x10*14] = b1[0x0F];
280
281 b1[0x18] += b1[0x1C];
282 out0[0x10*15] = b1[0x10] + b1[0x18];
283 out0[0x10*13] = b1[0x18] + b1[0x14];
284 b1[0x1C] += b1[0x1a];
285 out0[0x10*11] = b1[0x14] + b1[0x1C];
286 out0[0x10* 9] = b1[0x1C] + b1[0x12];
287 b1[0x1A] += b1[0x1E];
288 out0[0x10* 7] = b1[0x12] + b1[0x1A];
289 out0[0x10* 5] = b1[0x1A] + b1[0x16];
290 b1[0x1E] += b1[0x19];
291 out0[0x10* 3] = b1[0x16] + b1[0x1E];
292 out0[0x10* 1] = b1[0x1E] + b1[0x11];
293 b1[0x19] += b1[0x1D];
294 out1[0x10* 1] = b1[0x11] + b1[0x19];
295 out1[0x10* 3] = b1[0x19] + b1[0x15];
296 b1[0x1D] += b1[0x1B];
297 out1[0x10* 5] = b1[0x15] + b1[0x1D];
298 out1[0x10* 7] = b1[0x1D] + b1[0x13];
299 b1[0x1B] += b1[0x1F];
300 out1[0x10* 9] = b1[0x13] + b1[0x1B];
301 out1[0x10*11] = b1[0x1B] + b1[0x17];
302 out1[0x10*13] = b1[0x17] + b1[0x1F];
303 out1[0x10*15] = b1[0x1F];
304 }
305
306 /*
307 * the call via dct64 is a trick to force GCC to use
308 * (new) registers for the b1,b2 pointer to the bufs[xx] field
309 */
310 void dct64(real *a,real *b,real *c)
311 {
312 real bufs[0x40];
313 dct64_1(a,b,bufs,bufs+0x20,c);
314 }
315