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
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
/* Copyright (C) 2002 Jean-Marc Valin
File: stereo.c
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config-speex.h"
#endif
#include "speex/speex_stereo.h"
#include "speex/speex_callbacks.h"
#include "math_approx.h"
#include "vq.h"
#ifndef FIXED_POINT
#include <math.h>
#endif
#include "os_support.h"
typedef struct RealSpeexStereoState {
spx_word32_t balance; /**< Left/right balance info */
spx_word32_t e_ratio; /**< Ratio of energies: E(left+right)/[E(left)+E(right)] */
spx_word32_t smooth_left; /**< Smoothed left channel gain */
spx_word32_t smooth_right; /**< Smoothed right channel gain */
spx_uint32_t reserved1; /**< Reserved for future use */
spx_int32_t reserved2; /**< Reserved for future use */
} RealSpeexStereoState;
/*float e_ratio_quant[4] = {1, 1.26, 1.587, 2};*/
#ifndef FIXED_POINT
static const float e_ratio_quant[4] = {.25f, .315f, .397f, .5f};
static const float e_ratio_quant_bounds[3] = {0.2825f, 0.356f, 0.4485f};
#else
static const spx_word16_t e_ratio_quant[4] = {8192, 10332, 13009, 16384};
static const spx_word16_t e_ratio_quant_bounds[3] = {9257, 11665, 14696};
static const spx_word16_t balance_bounds[31] = {18, 23, 30, 38, 49, 63, 81, 104,
134, 172, 221, 284, 364, 468, 600, 771,
990, 1271, 1632, 2096, 2691, 3455, 4436, 5696,
7314, 9392, 12059, 15484, 19882, 25529, 32766};
#endif
/* This is an ugly compatibility hack that properly resets the stereo state
In case it it compiled in fixed-point, but initialised with the deprecated
floating point static initialiser */
#ifdef FIXED_POINT
#define COMPATIBILITY_HACK(s) do {if ((s)->reserved1 != 0xdeadbeef) speex_stereo_state_reset((SpeexStereoState*)s); } while (0);
#else
#define COMPATIBILITY_HACK(s)
#endif
static SpeexStereoState global_stereo_state;
EXPORT SpeexStereoState *speex_stereo_state_init()
{
/* SpeexStereoState *stereo = speex_alloc(sizeof(SpeexStereoState)); */
SpeexStereoState *stereo = &global_stereo_state;
speex_stereo_state_reset(stereo);
return stereo;
}
EXPORT void speex_stereo_state_reset(SpeexStereoState *_stereo)
{
RealSpeexStereoState *stereo = (RealSpeexStereoState*)_stereo;
#ifdef FIXED_POINT
stereo->balance = 65536;
stereo->e_ratio = 16384;
stereo->smooth_left = 16384;
stereo->smooth_right = 16384;
stereo->reserved1 = 0xdeadbeef;
stereo->reserved2 = 0;
#else
stereo->balance = 1.0f;
stereo->e_ratio = .5f;
stereo->smooth_left = 1.f;
stereo->smooth_right = 1.f;
stereo->reserved1 = 0;
stereo->reserved2 = 0;
#endif
}
EXPORT void speex_stereo_state_destroy(SpeexStereoState *stereo)
{
(void)stereo;
/* speex_free(stereo); */
}
#ifndef SPEEX_DISABLE_ENCODER
#ifndef DISABLE_FLOAT_API
EXPORT void speex_encode_stereo(float *data, int frame_size, SpeexBits *bits)
{
int i, tmp;
float e_left=0, e_right=0, e_tot=0;
float balance, e_ratio;
for (i=0;i<frame_size;i++)
{
e_left += ((float)data[2*i])*data[2*i];
e_right += ((float)data[2*i+1])*data[2*i+1];
data[i] = .5*(((float)data[2*i])+data[2*i+1]);
e_tot += ((float)data[i])*data[i];
}
balance=(e_left+1)/(e_right+1);
e_ratio = e_tot/(1+e_left+e_right);
/*Quantization*/
speex_bits_pack(bits, 14, 5);
speex_bits_pack(bits, SPEEX_INBAND_STEREO, 4);
balance=4*log(balance);
/*Pack sign*/
if (balance>0)
speex_bits_pack(bits, 0, 1);
else
speex_bits_pack(bits, 1, 1);
balance=floor(.5+fabs(balance));
if (balance>30)
balance=31;
speex_bits_pack(bits, (int)balance, 5);
/* FIXME: this is a hack */
tmp=scal_quant(e_ratio*Q15_ONE, e_ratio_quant_bounds, 4);
speex_bits_pack(bits, tmp, 2);
}
#endif /* #ifndef DISABLE_FLOAT_API */
EXPORT void speex_encode_stereo_int(spx_int16_t *data, int frame_size, SpeexBits *bits)
{
int i, tmp;
spx_word32_t e_left=0, e_right=0, e_tot=0;
spx_word32_t balance, e_ratio;
spx_word32_t largest, smallest;
int balance_id;
#ifdef FIXED_POINT
int shift;
#endif
/* In band marker */
speex_bits_pack(bits, 14, 5);
/* Stereo marker */
speex_bits_pack(bits, SPEEX_INBAND_STEREO, 4);
for (i=0;i<frame_size;i++)
{
e_left += SHR32(MULT16_16(data[2*i],data[2*i]),8);
e_right += SHR32(MULT16_16(data[2*i+1],data[2*i+1]),8);
#ifdef FIXED_POINT
/* I think this is actually unbiased */
data[i] = SHR16(data[2*i],1)+PSHR16(data[2*i+1],1);
#else
data[i] = .5*(((float)data[2*i])+data[2*i+1]);
#endif
e_tot += SHR32(MULT16_16(data[i],data[i]),8);
}
if (e_left > e_right)
{
speex_bits_pack(bits, 0, 1);
largest = e_left;
smallest = e_right;
} else {
speex_bits_pack(bits, 1, 1);
largest = e_right;
smallest = e_left;
}
/* Balance quantization */
#ifdef FIXED_POINT
shift = spx_ilog2(largest)-15;
largest = VSHR32(largest, shift-4);
smallest = VSHR32(smallest, shift);
balance = DIV32(largest, ADD32(smallest, 1));
if (balance > 32767)
balance = 32767;
balance_id = scal_quant(EXTRACT16(balance), balance_bounds, 32);
#else
balance=(largest+1.)/(smallest+1.);
balance=4*log(balance);
balance_id=floor(.5+fabs(balance));
if (balance_id>30)
balance_id=31;
#endif
speex_bits_pack(bits, balance_id, 5);
/* "coherence" quantisation */
#ifdef FIXED_POINT
shift = spx_ilog2(e_tot);
e_tot = VSHR32(e_tot, shift-25);
e_left = VSHR32(e_left, shift-10);
e_right = VSHR32(e_right, shift-10);
e_ratio = DIV32(e_tot, e_left+e_right+1);
#else
e_ratio = e_tot/(1.+e_left+e_right);
#endif
tmp=scal_quant(EXTRACT16(e_ratio), e_ratio_quant_bounds, 4);
/*fprintf (stderr, "%d %d %d %d\n", largest, smallest, balance_id, e_ratio);*/
speex_bits_pack(bits, tmp, 2);
}
#endif /* SPEEX_DISABLE_ENCODER */
#ifndef DISABLE_FLOAT_API
EXPORT void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *_stereo)
{
int i;
spx_word32_t balance;
spx_word16_t e_left, e_right, e_ratio;
RealSpeexStereoState *stereo = (RealSpeexStereoState*)_stereo;
COMPATIBILITY_HACK(stereo);
balance=stereo->balance;
e_ratio=stereo->e_ratio;
/* These two are Q14, with max value just below 2. */
e_right = DIV32(QCONST32(1., 22), spx_sqrt(MULT16_32_Q15(e_ratio, ADD32(QCONST32(1., 16), balance))));
e_left = SHR32(MULT16_16(spx_sqrt(balance), e_right), 8);
for (i=frame_size-1;i>=0;i--)
{
spx_word16_t tmp=data[i];
stereo->smooth_left = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_left, QCONST16(0.98, 15)), e_left, QCONST16(0.02, 15)), 15));
stereo->smooth_right = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_right, QCONST16(0.98, 15)), e_right, QCONST16(0.02, 15)), 15));
data[2*i] = (float)MULT16_16_P14(stereo->smooth_left, tmp);
data[2*i+1] = (float)MULT16_16_P14(stereo->smooth_right, tmp);
}
}
#endif /* #ifndef DISABLE_FLOAT_API */
EXPORT void speex_decode_stereo_int(spx_int16_t *data, int frame_size, SpeexStereoState *_stereo)
{
int i;
spx_word32_t balance;
spx_word16_t e_left, e_right, e_ratio;
RealSpeexStereoState *stereo = (RealSpeexStereoState*)_stereo;
/* COMPATIBILITY_HACK(stereo); */
balance=stereo->balance;
e_ratio=stereo->e_ratio;
/* These two are Q14, with max value just below 2. */
e_right = DIV32(QCONST32(1., 22), spx_sqrt(MULT16_32_Q15(e_ratio, ADD32(QCONST32(1., 16), balance))));
e_left = SHR32(MULT16_16(spx_sqrt(balance), e_right), 8);
for (i=frame_size-1;i>=0;i--)
{
spx_int16_t tmp=data[i];
stereo->smooth_left = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_left, QCONST16(0.98, 15)), e_left, QCONST16(0.02, 15)), 15));
stereo->smooth_right = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_right, QCONST16(0.98, 15)), e_right, QCONST16(0.02, 15)), 15));
data[2*i] = (spx_int16_t)MULT16_16_P14(stereo->smooth_left, tmp);
data[2*i+1] = (spx_int16_t)MULT16_16_P14(stereo->smooth_right, tmp);
}
}
EXPORT int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data)
{
(void)state;
RealSpeexStereoState *stereo;
spx_word16_t sign=1, dexp;
int tmp;
stereo = (RealSpeexStereoState*)data;
/* COMPATIBILITY_HACK(stereo); */
if (speex_bits_unpack_unsigned(bits, 1))
sign=-1;
dexp = speex_bits_unpack_unsigned(bits, 5);
#ifndef FIXED_POINT
stereo->balance = exp(sign*.25*dexp);
#else
stereo->balance = spx_exp(MULT16_16(sign, SHL16(dexp, 9)));
#endif
tmp = speex_bits_unpack_unsigned(bits, 2);
stereo->e_ratio = e_ratio_quant[tmp];
return 0;
}
|