1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
|
/*
* Mpeg Layer-1,2,3 audio decoder
* ------------------------------
* copyright (c) 1995,1996,1997 by Michael Hipp, All rights reserved.
* See also 'README'
*
* N->M down/up sampling. Not optimized for speed.
*/
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include "mpg123.h"
#define WRITE_SAMPLE(samples,sum,clip) \
if( (sum) > 32767.0) { *(samples) = 0x7fff; (clip)++; } \
else if( (sum) < -32768.0) { *(samples) = -0x8000; (clip)++; } \
else { *(samples) = sum; }
#define NTOM_MUL (32768)
static unsigned long ntom_val[2] = { NTOM_MUL>>1,NTOM_MUL>>1 };
static unsigned long ntom_step = NTOM_MUL;
void synth_ntom_set_step(long m,long n)
{
if(param.verbose > 1)
fprintf(stderr,"Init rate converter: %ld->%ld\n",m,n);
if(n >= 96000 || m >= 96000 || m == 0 || n == 0) {
fprintf(stderr,"NtoM converter: illegal rates\n");
exit(1);
}
n *= NTOM_MUL;
ntom_step = n / m;
if(ntom_step > 8*NTOM_MUL) {
fprintf(stderr,"max. 1:8 conversion allowed!\n");
exit(1);
}
ntom_val[0] = ntom_val[1] = NTOM_MUL>>1;
}
int synth_ntom_8bit(real *bandPtr,int channel,unsigned char *samples,int *pnt)
{
short samples_tmp[8*64];
short *tmp1 = samples_tmp + channel;
int i,ret;
int pnt1 = 0;
ret = synth_ntom(bandPtr,channel,(unsigned char *) samples_tmp,&pnt1);
samples += channel + *pnt;
for(i=0;i<(pnt1>>2);i++) {
*samples = conv16to8[*tmp1>>AUSHIFT];
samples += 2;
tmp1 += 2;
}
*pnt += pnt1>>1;
return ret;
}
int synth_ntom_8bit_mono(real *bandPtr,unsigned char *samples,int *pnt)
{
short samples_tmp[8*64];
short *tmp1 = samples_tmp;
int i,ret;
int pnt1 = 0;
ret = synth_ntom(bandPtr,0,(unsigned char *) samples_tmp,&pnt1);
samples += *pnt;
for(i=0;i<(pnt1>>2);i++) {
*samples++ = conv16to8[*tmp1>>AUSHIFT];
tmp1 += 2;
}
*pnt += pnt1 >> 2;
return ret;
}
int synth_ntom_8bit_mono2stereo(real *bandPtr,unsigned char *samples,int *pnt)
{
short samples_tmp[8*64];
short *tmp1 = samples_tmp;
int i,ret;
int pnt1 = 0;
ret = synth_ntom(bandPtr,0,(unsigned char *) samples_tmp,&pnt1);
samples += *pnt;
for(i=0;i<(pnt1>>2);i++) {
*samples++ = conv16to8[*tmp1>>AUSHIFT];
*samples++ = conv16to8[*tmp1>>AUSHIFT];
tmp1 += 2;
}
*pnt += pnt1 >> 1;
return ret;
}
int synth_ntom_mono(real *bandPtr,unsigned char *samples,int *pnt)
{
short samples_tmp[8*64];
short *tmp1 = samples_tmp;
int i,ret;
int pnt1 = 0;
ret = synth_ntom(bandPtr,0,(unsigned char *) samples_tmp,&pnt1);
samples += *pnt;
for(i=0;i<(pnt1>>2);i++) {
*( (short *)samples) = *tmp1;
samples += 2;
tmp1 += 2;
}
*pnt += pnt1 >> 1;
return ret;
}
int synth_ntom_mono2stereo(real *bandPtr,unsigned char *samples,int *pnt)
{
int i,ret;
int pnt1 = *pnt;
ret = synth_ntom(bandPtr,0,samples,pnt);
samples += pnt1;
for(i=0;i<((*pnt-pnt1)>>2);i++) {
((short *)samples)[1] = ((short *)samples)[0];
samples+=4;
}
return ret;
}
int synth_ntom(real *bandPtr,int channel,unsigned char *out,int *pnt)
{
static real buffs[2][2][0x110];
static const int step = 2;
static int bo = 1;
short *samples = (short *) (out + *pnt);
real *b0,(*buf)[0x110];
int clip = 0;
int bo1;
int ntom;
#ifndef NO_EQUALIZER
if(param.enable_equalizer)
do_equalizer(bandPtr,channel);
#endif
if(!channel) {
bo--;
bo &= 0xf;
buf = buffs[0];
ntom = ntom_val[1] = ntom_val[0];
}
else {
samples++;
out += 2; /* to compute the right *pnt value */
buf = buffs[1];
ntom = ntom_val[1];
}
if(bo & 0x1) {
b0 = buf[0];
bo1 = bo;
dct64(buf[1]+((bo+1)&0xf),buf[0]+bo,bandPtr);
}
else {
b0 = buf[1];
bo1 = bo+1;
dct64(buf[0]+bo,buf[1]+bo+1,bandPtr);
}
{
register int j;
real *window = decwin + 16 - bo1;
for (j=16;j;j--,window+=0x10)
{
real sum;
ntom += ntom_step;
if(ntom < NTOM_MUL) {
window += 16;
b0 += 16;
continue;
}
sum = *window++ * *b0++;
sum -= *window++ * *b0++;
sum += *window++ * *b0++;
sum -= *window++ * *b0++;
sum += *window++ * *b0++;
sum -= *window++ * *b0++;
sum += *window++ * *b0++;
sum -= *window++ * *b0++;
sum += *window++ * *b0++;
sum -= *window++ * *b0++;
sum += *window++ * *b0++;
sum -= *window++ * *b0++;
sum += *window++ * *b0++;
sum -= *window++ * *b0++;
sum += *window++ * *b0++;
sum -= *window++ * *b0++;
while(ntom >= NTOM_MUL) {
WRITE_SAMPLE(samples,sum,clip);
samples += step;
ntom -= NTOM_MUL;
}
}
ntom += ntom_step;
if(ntom >= NTOM_MUL)
{
real sum;
sum = window[0x0] * b0[0x0];
sum += window[0x2] * b0[0x2];
sum += window[0x4] * b0[0x4];
sum += window[0x6] * b0[0x6];
sum += window[0x8] * b0[0x8];
sum += window[0xA] * b0[0xA];
sum += window[0xC] * b0[0xC];
sum += window[0xE] * b0[0xE];
while(ntom >= NTOM_MUL) {
WRITE_SAMPLE(samples,sum,clip);
samples += step;
ntom -= NTOM_MUL;
}
}
b0-=0x10,window-=0x20;
window += bo1<<1;
for (j=15;j;j--,b0-=0x20,window-=0x10)
{
real sum;
ntom += ntom_step;
if(ntom < NTOM_MUL) {
window -= 16;
b0 += 16;
continue;
}
sum = -*(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
sum -= *(--window) * *b0++;
while(ntom >= NTOM_MUL) {
WRITE_SAMPLE(samples,sum,clip);
samples += step;
ntom -= NTOM_MUL;
}
}
}
ntom_val[channel] = ntom;
*pnt = ((unsigned char *) samples - out);
return clip;
}
|
