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
|
/*
* Copyright (C) 2003-2013 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 "Volume.hxx"
#include "Domain.hxx"
#include "PcmUtils.hxx"
#include "Traits.hxx"
#include "util/ConstBuffer.hxx"
#include "util/Error.hxx"
#include <stdint.h>
#include <string.h>
template<SampleFormat F, class Traits=SampleTraits<F>>
static inline typename Traits::value_type
pcm_volume_sample(typename Traits::value_type _sample,
int volume)
{
typename Traits::long_type sample(_sample);
sample = (sample * volume + pcm_volume_dither() +
PCM_VOLUME_1S / 2)
>> PCM_VOLUME_BITS;
return PcmClamp<F, Traits>(sample);
}
#ifdef __i386__
/**
* Optimized volume function for i386. Use the EDX:EAX 2*32 bit
* multiplication result instead of emulating 64 bit multiplication.
*/
static inline int32_t
pcm_volume_sample_24(int32_t sample, int32_t volume, gcc_unused int32_t dither)
{
int32_t result;
asm(/* edx:eax = sample * volume */
"imul %2\n"
/* "add %3, %1\n" dithering disabled for now, because we
have no overflow check - is dithering really important
here? */
/* eax = edx:eax / PCM_VOLUME_1 */
"sal $22, %%edx\n"
"shr $10, %1\n"
"or %%edx, %1\n"
: "=a"(result)
: "0"(sample), "r"(volume) /* , "r"(dither) */
: "edx"
);
return result;
}
template<>
inline int32_t
pcm_volume_sample<SampleFormat::S24_P32,
SampleTraits<SampleFormat::S24_P32>>(int32_t sample,
int volume)
{
return pcm_volume_sample_24(sample, volume, pcm_volume_dither());
}
template<>
inline int32_t
pcm_volume_sample<SampleFormat::S32,
SampleTraits<SampleFormat::S32>>(int32_t sample, int volume)
{
return pcm_volume_sample_24(sample, volume, pcm_volume_dither());
}
#endif
template<SampleFormat F, class Traits=SampleTraits<F>>
static void
pcm_volume_change(typename Traits::pointer_type dest,
typename Traits::const_pointer_type src,
typename Traits::const_pointer_type end,
int volume)
{
while (src < end) {
const auto sample = *src++;
*dest++ = pcm_volume_sample<F, Traits>(sample, volume);
}
}
static void
pcm_volume_change_8(int8_t *dest, const int8_t *src, const int8_t *end,
int volume)
{
pcm_volume_change<SampleFormat::S8>(dest, src, end, volume);
}
static void
pcm_volume_change_16(int16_t *dest, const int16_t *src, const int16_t *end,
int volume)
{
pcm_volume_change<SampleFormat::S16>(dest, src, end, volume);
}
static void
pcm_volume_change_24(int32_t *dest, const int32_t *src, const int32_t *end,
int volume)
{
pcm_volume_change<SampleFormat::S24_P32>(dest, src, end, volume);
}
static void
pcm_volume_change_32(int32_t *dest, const int32_t *src, const int32_t *end,
int volume)
{
pcm_volume_change<SampleFormat::S32>(dest, src, end, volume);
}
static void
pcm_volume_change_float(float *dest, const float *src, const float *end,
float volume)
{
while (src < end) {
float sample = *src++;
sample *= volume;
*dest++ = sample;
}
}
bool
PcmVolume::Open(SampleFormat _format, Error &error)
{
assert(format == SampleFormat::UNDEFINED);
switch (_format) {
case SampleFormat::UNDEFINED:
case SampleFormat::DSD:
error.Format(pcm_domain,
"Software volume for %s is not implemented",
sample_format_to_string(_format));
return false;
case SampleFormat::S8:
case SampleFormat::S16:
case SampleFormat::S24_P32:
case SampleFormat::S32:
case SampleFormat::FLOAT:
break;
}
format = _format;
return true;
}
ConstBuffer<void>
PcmVolume::Apply(ConstBuffer<void> src)
{
if (volume == PCM_VOLUME_1)
return src;
void *data = buffer.Get(src.size);
if (volume == 0) {
/* optimized special case: 0% volume = memset(0) */
/* TODO: is this valid for all sample formats? What
about floating point? */
memset(data, 0, src.size);
return { data, src.size };
}
const void *end = pcm_end_pointer(src.data, src.size);
switch (format) {
case SampleFormat::UNDEFINED:
case SampleFormat::DSD:
assert(false);
gcc_unreachable();
case SampleFormat::S8:
pcm_volume_change_8((int8_t *)data,
(const int8_t *)src.data,
(const int8_t *)end,
volume);
break;
case SampleFormat::S16:
pcm_volume_change_16((int16_t *)data,
(const int16_t *)src.data,
(const int16_t *)end,
volume);
break;
case SampleFormat::S24_P32:
pcm_volume_change_24((int32_t *)data,
(const int32_t *)src.data,
(const int32_t *)end,
volume);
break;
case SampleFormat::S32:
pcm_volume_change_32((int32_t *)data,
(const int32_t *)src.data,
(const int32_t *)end,
volume);
break;
case SampleFormat::FLOAT:
pcm_volume_change_float((float *)data,
(const float *)src.data,
(const float *)end,
pcm_volume_to_float(volume));
break;
}
return { data, src.size };
}
|
