1 /*
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.org
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 "mpg123lib_intern.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 long)(a)*(long 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
dct64_1_486(int * out0,int * out1,int * b1,int * b2)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 */
dct64_i486(int * a,int * b,real * samples)320 void dct64_i486(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
343