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/*
2
	dct64_i486.c: DCT64, a plain C variant for i486
3
 
4
	copyright 1998-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
5
	see COPYING and AUTHORS files in distribution or http://mpg123.de
6
	initially written by Fabrice Bellard
7
*/
8
 
9
/* Discrete Cosine Tansform (DCT) for subband synthesis.
10
 *
11
 * This code is optimized for 80486. It should be compiled with gcc
12
 * 2.7.2 or higher.
13
 *
14
 * Note: This code does not give the necessary accuracy. Moreover, no
15
 * overflow test are done.
16
 *
17
 * (c) 1998 Fabrice Bellard.
18
 */
19
 
20
#include "mpg123.h"
21
 
22
#define COS_0_0 16403
23
#define COS_0_1 16563
24
#define COS_0_2 16890
25
#define COS_0_3 17401
26
#define COS_0_4 18124
27
#define COS_0_5 19101
28
#define COS_0_6 20398
29
#define COS_0_7 22112
30
#define COS_0_8 24396
31
#define COS_0_9 27503
32
#define COS_0_10 31869
33
#define COS_0_11 38320
34
#define COS_0_12 48633
35
#define COS_0_13 67429
36
#define COS_0_14 111660
37
#define COS_0_15 333906
38
#define COS_1_0 16463
39
#define COS_1_1 17121
40
#define COS_1_2 18577
41
#define COS_1_3 21195
42
#define COS_1_4 25826
43
#define COS_1_5 34756
44
#define COS_1_6 56441
45
#define COS_1_7 167154
46
#define COS_2_0 16704
47
#define COS_2_1 19704
48
#define COS_2_2 29490
49
#define COS_2_3 83981
50
#define COS_3_0 17733
51
#define COS_3_1 42813
52
#define COS_4_0 23170
53
 
54
#define SETOUT(out,n,expr) out[FIR_BUFFER_SIZE*(n)]=(expr)
55
#define MULL(a,b) (((long)(a)*(long)(b)) >> 15)
56
#define MUL(a,b) \
57
(\
58
       ((!(b & 0x3F)) ? (((a)*(b >> 6)) >> 9) :\
59
       ((!(b & 0x1F)) ? (((a)*(b >> 5)) >> 10) :\
60
       ((!(b & 0x0F)) ? (((a)*(b >> 4)) >> 11) :\
61
       ((!(b & 0x07)) ? (((a)*(b >> 3)) >> 12) :\
62
       ((!(b & 0x03)) ? (((a)*(b >> 2)) >> 13) :\
63
       ((!(b & 0x01)) ? (((a)*(b >> 1)) >> 14) :\
64
                        (((a)*(b   )) >> 15))))))))
65
 
66
 
67
void dct64_1_486(int *out0,int *out1,int *b1,int *b2)
68
{
69
  b1[0x00] = b2[0x00] + b2[0x1F];
70
  b1[0x1F] = MUL((b2[0x00] - b2[0x1F]),COS_0_0);
71
 
72
  b1[0x01] = b2[0x01] + b2[0x1E];
73
  b1[0x1E] = MUL((b2[0x01] - b2[0x1E]),COS_0_1);
74
 
75
  b1[0x02] = b2[0x02] + b2[0x1D];
76
  b1[0x1D] = MUL((b2[0x02] - b2[0x1D]),COS_0_2);
77
 
78
  b1[0x03] = b2[0x03] + b2[0x1C];
79
  b1[0x1C] = MUL((b2[0x03] - b2[0x1C]),COS_0_3);
80
 
81
  b1[0x04] = b2[0x04] + b2[0x1B];
82
  b1[0x1B] = MUL((b2[0x04] - b2[0x1B]),COS_0_4);
83
 
84
  b1[0x05] = b2[0x05] + b2[0x1A];
85
  b1[0x1A] = MUL((b2[0x05] - b2[0x1A]),COS_0_5);
86
 
87
  b1[0x06] = b2[0x06] + b2[0x19];
88
  b1[0x19] = MUL((b2[0x06] - b2[0x19]),COS_0_6);
89
 
90
  b1[0x07] = b2[0x07] + b2[0x18];
91
  b1[0x18] = MUL((b2[0x07] - b2[0x18]),COS_0_7);
92
 
93
  b1[0x08] = b2[0x08] + b2[0x17];
94
  b1[0x17] = MUL((b2[0x08] - b2[0x17]),COS_0_8);
95
 
96
  b1[0x09] = b2[0x09] + b2[0x16];
97
  b1[0x16] = MUL((b2[0x09] - b2[0x16]),COS_0_9);
98
 
99
  b1[0x0A] = b2[0x0A] + b2[0x15];
100
  b1[0x15] = MUL((b2[0x0A] - b2[0x15]),COS_0_10);
101
 
102
  b1[0x0B] = b2[0x0B] + b2[0x14];
103
  b1[0x14] = MUL((b2[0x0B] - b2[0x14]),COS_0_11);
104
 
105
  b1[0x0C] = b2[0x0C] + b2[0x13];
106
  b1[0x13] = MUL((b2[0x0C] - b2[0x13]),COS_0_12);
107
 
108
  b1[0x0D] = b2[0x0D] + b2[0x12];
109
  b1[0x12] = MULL((b2[0x0D] - b2[0x12]),COS_0_13);
110
 
111
  b1[0x0E] = b2[0x0E] + b2[0x11];
112
  b1[0x11] = MULL((b2[0x0E] - b2[0x11]),COS_0_14);
113
 
114
  b1[0x0F] = b2[0x0F] + b2[0x10];
115
  b1[0x10] = MULL((b2[0x0F] - b2[0x10]),COS_0_15);
116
 
117
 
118
  b2[0x00] = b1[0x00] + b1[0x0F];
119
  b2[0x0F] = MUL((b1[0x00] - b1[0x0F]),COS_1_0);
120
  b2[0x01] = b1[0x01] + b1[0x0E];
121
  b2[0x0E] = MUL((b1[0x01] - b1[0x0E]),COS_1_1);
122
  b2[0x02] = b1[0x02] + b1[0x0D];
123
  b2[0x0D] = MUL((b1[0x02] - b1[0x0D]),COS_1_2);
124
  b2[0x03] = b1[0x03] + b1[0x0C];
125
  b2[0x0C] = MUL((b1[0x03] - b1[0x0C]),COS_1_3);
126
  b2[0x04] = b1[0x04] + b1[0x0B];
127
  b2[0x0B] = MUL((b1[0x04] - b1[0x0B]),COS_1_4);
128
  b2[0x05] = b1[0x05] + b1[0x0A];
129
  b2[0x0A] = MUL((b1[0x05] - b1[0x0A]),COS_1_5);
130
  b2[0x06] = b1[0x06] + b1[0x09];
131
  b2[0x09] = MUL((b1[0x06] - b1[0x09]),COS_1_6);
132
  b2[0x07] = b1[0x07] + b1[0x08];
133
  b2[0x08] = MULL((b1[0x07] - b1[0x08]),COS_1_7);
134
 
135
  b2[0x10] = b1[0x10] + b1[0x1F];
136
  b2[0x1F] = MUL((b1[0x1F] - b1[0x10]),COS_1_0);
137
  b2[0x11] = b1[0x11] + b1[0x1E];
138
  b2[0x1E] = MUL((b1[0x1E] - b1[0x11]),COS_1_1);
139
  b2[0x12] = b1[0x12] + b1[0x1D];
140
  b2[0x1D] = MUL((b1[0x1D] - b1[0x12]),COS_1_2);
141
  b2[0x13] = b1[0x13] + b1[0x1C];
142
  b2[0x1C] = MUL((b1[0x1C] - b1[0x13]),COS_1_3);
143
  b2[0x14] = b1[0x14] + b1[0x1B];
144
  b2[0x1B] = MUL((b1[0x1B] - b1[0x14]),COS_1_4);
145
  b2[0x15] = b1[0x15] + b1[0x1A];
146
  b2[0x1A] = MUL((b1[0x1A] - b1[0x15]),COS_1_5);
147
  b2[0x16] = b1[0x16] + b1[0x19];
148
  b2[0x19] = MUL((b1[0x19] - b1[0x16]),COS_1_6);
149
  b2[0x17] = b1[0x17] + b1[0x18];
150
  b2[0x18] = MULL((b1[0x18] - b1[0x17]),COS_1_7);
151
 
152
 
153
  b1[0x00] = b2[0x00] + b2[0x07];
154
  b1[0x07] = MUL((b2[0x00] - b2[0x07]),COS_2_0);
155
  b1[0x01] = b2[0x01] + b2[0x06];
156
  b1[0x06] = MUL((b2[0x01] - b2[0x06]),COS_2_1);
157
  b1[0x02] = b2[0x02] + b2[0x05];
158
  b1[0x05] = MUL((b2[0x02] - b2[0x05]),COS_2_2);
159
  b1[0x03] = b2[0x03] + b2[0x04];
160
  b1[0x04] = MULL((b2[0x03] - b2[0x04]),COS_2_3);
161
 
162
  b1[0x08] = b2[0x08] + b2[0x0F];
163
  b1[0x0F] = MUL((b2[0x0F] - b2[0x08]),COS_2_0);
164
  b1[0x09] = b2[0x09] + b2[0x0E];
165
  b1[0x0E] = MUL((b2[0x0E] - b2[0x09]),COS_2_1);
166
  b1[0x0A] = b2[0x0A] + b2[0x0D];
167
  b1[0x0D] = MUL((b2[0x0D] - b2[0x0A]),COS_2_2);
168
  b1[0x0B] = b2[0x0B] + b2[0x0C];
169
  b1[0x0C] = MULL((b2[0x0C] - b2[0x0B]),COS_2_3);
170
 
171
  b1[0x10] = b2[0x10] + b2[0x17];
172
  b1[0x17] = MUL((b2[0x10] - b2[0x17]),COS_2_0);
173
  b1[0x11] = b2[0x11] + b2[0x16];
174
  b1[0x16] = MUL((b2[0x11] - b2[0x16]),COS_2_1);
175
  b1[0x12] = b2[0x12] + b2[0x15];
176
  b1[0x15] = MUL((b2[0x12] - b2[0x15]),COS_2_2);
177
  b1[0x13] = b2[0x13] + b2[0x14];
178
  b1[0x14] = MULL((b2[0x13] - b2[0x14]),COS_2_3);
179
 
180
  b1[0x18] = b2[0x18] + b2[0x1F];
181
  b1[0x1F] = MUL((b2[0x1F] - b2[0x18]),COS_2_0);
182
  b1[0x19] = b2[0x19] + b2[0x1E];
183
  b1[0x1E] = MUL((b2[0x1E] - b2[0x19]),COS_2_1);
184
  b1[0x1A] = b2[0x1A] + b2[0x1D];
185
  b1[0x1D] = MUL((b2[0x1D] - b2[0x1A]),COS_2_2);
186
  b1[0x1B] = b2[0x1B] + b2[0x1C];
187
  b1[0x1C] = MULL((b2[0x1C] - b2[0x1B]),COS_2_3);
188
 
189
 
190
  b2[0x00] = b1[0x00] + b1[0x03];
191
  b2[0x03] = MUL((b1[0x00] - b1[0x03]),COS_3_0);
192
  b2[0x01] = b1[0x01] + b1[0x02];
193
  b2[0x02] = MUL((b1[0x01] - b1[0x02]),COS_3_1);
194
 
195
  b2[0x04] = b1[0x04] + b1[0x07];
196
  b2[0x07] = MUL((b1[0x07] - b1[0x04]),COS_3_0);
197
  b2[0x05] = b1[0x05] + b1[0x06];
198
  b2[0x06] = MUL((b1[0x06] - b1[0x05]),COS_3_1);
199
 
200
  b2[0x08] = b1[0x08] + b1[0x0B];
201
  b2[0x0B] = MUL((b1[0x08] - b1[0x0B]),COS_3_0);
202
  b2[0x09] = b1[0x09] + b1[0x0A];
203
  b2[0x0A] = MUL((b1[0x09] - b1[0x0A]),COS_3_1);
204
 
205
  b2[0x0C] = b1[0x0C] + b1[0x0F];
206
  b2[0x0F] = MUL((b1[0x0F] - b1[0x0C]),COS_3_0);
207
  b2[0x0D] = b1[0x0D] + b1[0x0E];
208
  b2[0x0E] = MUL((b1[0x0E] - b1[0x0D]),COS_3_1);
209
 
210
  b2[0x10] = b1[0x10] + b1[0x13];
211
  b2[0x13] = MUL((b1[0x10] - b1[0x13]),COS_3_0);
212
  b2[0x11] = b1[0x11] + b1[0x12];
213
  b2[0x12] = MUL((b1[0x11] - b1[0x12]),COS_3_1);
214
 
215
  b2[0x14] = b1[0x14] + b1[0x17];
216
  b2[0x17] = MUL((b1[0x17] - b1[0x14]),COS_3_0);
217
  b2[0x15] = b1[0x15] + b1[0x16];
218
  b2[0x16] = MUL((b1[0x16] - b1[0x15]),COS_3_1);
219
 
220
  b2[0x18] = b1[0x18] + b1[0x1B];
221
  b2[0x1B] = MUL((b1[0x18] - b1[0x1B]),COS_3_0);
222
  b2[0x19] = b1[0x19] + b1[0x1A];
223
  b2[0x1A] = MUL((b1[0x19] - b1[0x1A]),COS_3_1);
224
 
225
  b2[0x1C] = b1[0x1C] + b1[0x1F];
226
  b2[0x1F] = MUL((b1[0x1F] - b1[0x1C]),COS_3_0);
227
  b2[0x1D] = b1[0x1D] + b1[0x1E];
228
  b2[0x1E] = MUL((b1[0x1E] - b1[0x1D]),COS_3_1);
229
 
230
  {
231
    int i;
232
    for(i=0;i<32;i+=4) {
233
      b1[i+0x00] = b2[i+0x00] + b2[i+0x01];
234
      b1[i+0x01] = MUL((b2[i+0x00] - b2[i+0x01]),COS_4_0);
235
      b1[i+0x02] = b2[i+0x02] + b2[i+0x03];
236
      b1[i+0x03] = MUL((b2[i+0x03] - b2[i+0x02]),COS_4_0);
237
    }
238
  }
239
 
240
  b1[0x02] += b1[0x03];
241
  b1[0x06] += b1[0x07];
242
  b1[0x04] += b1[0x06];
243
  b1[0x06] += b1[0x05];
244
  b1[0x05] += b1[0x07];
245
 
246
  b1[0x0A] += b1[0x0B];
247
  b1[0x0E] += b1[0x0F];
248
  b1[0x0C] += b1[0x0E];
249
  b1[0x0E] += b1[0x0D];
250
  b1[0x0D] += b1[0x0F];
251
 
252
  b1[0x12] += b1[0x13];
253
  b1[0x16] += b1[0x17];
254
  b1[0x14] += b1[0x16];
255
  b1[0x16] += b1[0x15];
256
  b1[0x15] += b1[0x17];
257
 
258
  b1[0x1A] += b1[0x1B];
259
  b1[0x1E] += b1[0x1F];
260
  b1[0x1C] += b1[0x1E];
261
  b1[0x1E] += b1[0x1D];
262
  b1[0x1D] += b1[0x1F];
263
 
264
 SETOUT(out0,16,b1[0x00]);
265
 SETOUT(out0,12,b1[0x04]);
266
 SETOUT(out0, 8,b1[0x02]);
267
 SETOUT(out0, 4,b1[0x06]);
268
 SETOUT(out0, 0,b1[0x01]);
269
 SETOUT(out1, 0,b1[0x01]);
270
 SETOUT(out1, 4,b1[0x05]);
271
 SETOUT(out1, 8,b1[0x03]);
272
 SETOUT(out1,12,b1[0x07]);
273
 
274
 b1[0x08] += b1[0x0C];
275
 SETOUT(out0,14,b1[0x08]);
276
 b1[0x0C] += b1[0x0a];
277
 SETOUT(out0,10,b1[0x0C]);
278
 b1[0x0A] += b1[0x0E];
279
 SETOUT(out0, 6,b1[0x0A]);
280
 b1[0x0E] += b1[0x09];
281
 SETOUT(out0, 2,b1[0x0E]);
282
 b1[0x09] += b1[0x0D];
283
 SETOUT(out1, 2,b1[0x09]);
284
 b1[0x0D] += b1[0x0B];
285
 SETOUT(out1, 6,b1[0x0D]);
286
 b1[0x0B] += b1[0x0F];
287
 SETOUT(out1,10,b1[0x0B]);
288
 SETOUT(out1,14,b1[0x0F]);
289
 
290
 b1[0x18] += b1[0x1C];
291
 SETOUT(out0,15,b1[0x10] + b1[0x18]);
292
 SETOUT(out0,13,b1[0x18] + b1[0x14]);
293
 b1[0x1C] += b1[0x1a];
294
 SETOUT(out0,11,b1[0x14] + b1[0x1C]);
295
 SETOUT(out0, 9,b1[0x1C] + b1[0x12]);
296
 b1[0x1A] += b1[0x1E];
297
 SETOUT(out0, 7,b1[0x12] + b1[0x1A]);
298
 SETOUT(out0, 5,b1[0x1A] + b1[0x16]);
299
 b1[0x1E] += b1[0x19];
300
 SETOUT(out0, 3,b1[0x16] + b1[0x1E]);
301
 SETOUT(out0, 1,b1[0x1E] + b1[0x11]);
302
 b1[0x19] += b1[0x1D];
303
 SETOUT(out1, 1,b1[0x11] + b1[0x19]);
304
 SETOUT(out1, 3,b1[0x19] + b1[0x15]);
305
 b1[0x1D] += b1[0x1B];
306
 SETOUT(out1, 5,b1[0x15] + b1[0x1D]);
307
 SETOUT(out1, 7,b1[0x1D] + b1[0x13]);
308
 b1[0x1B] += b1[0x1F];
309
 SETOUT(out1, 9,b1[0x13] + b1[0x1B]);
310
 SETOUT(out1,11,b1[0x1B] + b1[0x17]);
311
 SETOUT(out1,13,b1[0x17] + b1[0x1F]);
312
 SETOUT(out1,15,b1[0x1F]);
313
}
314
 
315
 
316
/*
317
 * the call via dct64 is a trick to force GCC to use
318
 * (new) registers for the b1,b2 pointer to the bufs[xx] field
319
 */
320
void dct64_486(int *a,int *b,real *samples)
321
{
322
  int bufs[64];
323
  int i;
324
 
325
#ifdef REAL_IS_FIXED
326
#define TOINT(a) ((a) * 32768 / (int)REAL_FACTOR)
327
 
328
  for(i=0;i<32;i++) {
329
    bufs[i]=TOINT(samples[i]);
330
  }
331
#else
332
  int *p = bufs;
333
  register double const scale = ((65536.0 * 32) + 1) * 65536.0;
334
 
335
  for(i=0;i<32;i++) {
336
    *((double *) (p++)) = scale + *samples++; /* beware on bufs overrun: 8B store from x87 */
337
  }
338
#endif
339
 
340
  dct64_1_486(a,b,bufs+32,bufs);
341
}
342