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2 pj 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.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