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
|
/*
* Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "pcm_mix.h"
#include "pcm_volume.h"
#include "pcm_utils.h"
#include "audio_format.h"
#include <glib.h>
#include <math.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "pcm"
static void
pcm_add_vol_8(int8_t *buffer1, const int8_t *buffer2,
unsigned num_samples, int volume1, int volume2)
{
while (num_samples > 0) {
int32_t sample1 = *buffer1;
int32_t sample2 = *buffer2++;
sample1 = ((sample1 * volume1 + sample2 * volume2) +
pcm_volume_dither() + PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1;
*buffer1++ = pcm_range(sample1, 8);
--num_samples;
}
}
static void
pcm_add_vol_16(int16_t *buffer1, const int16_t *buffer2,
unsigned num_samples, int volume1, int volume2)
{
while (num_samples > 0) {
int32_t sample1 = *buffer1;
int32_t sample2 = *buffer2++;
sample1 = ((sample1 * volume1 + sample2 * volume2) +
pcm_volume_dither() + PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1;
*buffer1++ = pcm_range(sample1, 16);
--num_samples;
}
}
static void
pcm_add_vol_24(int32_t *buffer1, const int32_t *buffer2,
unsigned num_samples, unsigned volume1, unsigned volume2)
{
while (num_samples > 0) {
int64_t sample1 = *buffer1;
int64_t sample2 = *buffer2++;
sample1 = ((sample1 * volume1 + sample2 * volume2) +
pcm_volume_dither() + PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1;
*buffer1++ = pcm_range(sample1, 24);
--num_samples;
}
}
static void
pcm_add_vol_32(int32_t *buffer1, const int32_t *buffer2,
unsigned num_samples, unsigned volume1, unsigned volume2)
{
while (num_samples > 0) {
int64_t sample1 = *buffer1;
int64_t sample2 = *buffer2++;
sample1 = ((sample1 * volume1 + sample2 * volume2) +
pcm_volume_dither() + PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1;
*buffer1++ = pcm_range_64(sample1, 32);
--num_samples;
}
}
static void
pcm_add_vol_float(float *buffer1, const float *buffer2,
unsigned num_samples, float volume1, float volume2)
{
while (num_samples > 0) {
float sample1 = *buffer1;
float sample2 = *buffer2++;
sample1 = (sample1 * volume1 + sample2 * volume2);
*buffer1++ = sample1;
--num_samples;
}
}
static bool
pcm_add_vol(void *buffer1, const void *buffer2, size_t size,
int vol1, int vol2,
enum sample_format format)
{
switch (format) {
case SAMPLE_FORMAT_UNDEFINED:
case SAMPLE_FORMAT_S24:
case SAMPLE_FORMAT_DSD:
case SAMPLE_FORMAT_DSD_LSBFIRST:
/* not implemented */
return false;
case SAMPLE_FORMAT_S8:
pcm_add_vol_8((int8_t *)buffer1, (const int8_t *)buffer2,
size, vol1, vol2);
return true;
case SAMPLE_FORMAT_S16:
pcm_add_vol_16((int16_t *)buffer1, (const int16_t *)buffer2,
size / 2, vol1, vol2);
return true;
case SAMPLE_FORMAT_S24_P32:
pcm_add_vol_24((int32_t *)buffer1, (const int32_t *)buffer2,
size / 4, vol1, vol2);
return true;
case SAMPLE_FORMAT_S32:
pcm_add_vol_32((int32_t *)buffer1, (const int32_t *)buffer2,
size / 4, vol1, vol2);
return true;
case SAMPLE_FORMAT_FLOAT:
pcm_add_vol_float(buffer1, buffer2, size / 4,
pcm_volume_to_float(vol1),
pcm_volume_to_float(vol2));
return true;
}
/* unreachable */
assert(false);
return false;
}
static void
pcm_add_8(int8_t *buffer1, const int8_t *buffer2, unsigned num_samples)
{
while (num_samples > 0) {
int32_t sample1 = *buffer1;
int32_t sample2 = *buffer2++;
sample1 += sample2;
*buffer1++ = pcm_range(sample1, 8);
--num_samples;
}
}
static void
pcm_add_16(int16_t *buffer1, const int16_t *buffer2, unsigned num_samples)
{
while (num_samples > 0) {
int32_t sample1 = *buffer1;
int32_t sample2 = *buffer2++;
sample1 += sample2;
*buffer1++ = pcm_range(sample1, 16);
--num_samples;
}
}
static void
pcm_add_24(int32_t *buffer1, const int32_t *buffer2, unsigned num_samples)
{
while (num_samples > 0) {
int64_t sample1 = *buffer1;
int64_t sample2 = *buffer2++;
sample1 += sample2;
*buffer1++ = pcm_range(sample1, 24);
--num_samples;
}
}
static void
pcm_add_32(int32_t *buffer1, const int32_t *buffer2, unsigned num_samples)
{
while (num_samples > 0) {
int64_t sample1 = *buffer1;
int64_t sample2 = *buffer2++;
sample1 += sample2;
*buffer1++ = pcm_range_64(sample1, 32);
--num_samples;
}
}
static void
pcm_add_float(float *buffer1, const float *buffer2, unsigned num_samples)
{
while (num_samples > 0) {
float sample1 = *buffer1;
float sample2 = *buffer2++;
*buffer1++ = sample1 + sample2;
--num_samples;
}
}
static bool
pcm_add(void *buffer1, const void *buffer2, size_t size,
enum sample_format format)
{
switch (format) {
case SAMPLE_FORMAT_UNDEFINED:
case SAMPLE_FORMAT_S24:
case SAMPLE_FORMAT_DSD:
case SAMPLE_FORMAT_DSD_LSBFIRST:
/* not implemented */
return false;
case SAMPLE_FORMAT_S8:
pcm_add_8((int8_t *)buffer1, (const int8_t *)buffer2, size);
return true;
case SAMPLE_FORMAT_S16:
pcm_add_16((int16_t *)buffer1, (const int16_t *)buffer2, size / 2);
return true;
case SAMPLE_FORMAT_S24_P32:
pcm_add_24((int32_t *)buffer1, (const int32_t *)buffer2, size / 4);
return true;
case SAMPLE_FORMAT_S32:
pcm_add_32((int32_t *)buffer1, (const int32_t *)buffer2, size / 4);
return true;
case SAMPLE_FORMAT_FLOAT:
pcm_add_float(buffer1, buffer2, size / 4);
return true;
}
/* unreachable */
assert(false);
return false;
}
bool
pcm_mix(void *buffer1, const void *buffer2, size_t size,
enum sample_format format, float portion1)
{
int vol1;
float s;
/* portion1 is between 0.0 and 1.0 for crossfading, MixRamp uses NaN
* to signal mixing rather than fading */
if (isnan(portion1))
return pcm_add(buffer1, buffer2, size, format);
s = sin(M_PI_2 * portion1);
s *= s;
vol1 = s * PCM_VOLUME_1 + 0.5;
vol1 = vol1 > PCM_VOLUME_1 ? PCM_VOLUME_1 : (vol1 < 0 ? 0 : vol1);
return pcm_add_vol(buffer1, buffer2, size, vol1, PCM_VOLUME_1 - vol1, format);
}
|
