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
|
/*
* Copyright (C) 2003-2014 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 "SoxrResampler.hxx"
#include "AudioFormat.hxx"
#include "util/ASCII.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include <soxr.h>
#include <assert.h>
#include <string.h>
static constexpr Domain soxr_domain("soxr");
static unsigned long soxr_quality_recipe = SOXR_HQ;
static const char *
soxr_quality_name(unsigned long recipe)
{
switch (recipe) {
case SOXR_VHQ:
return "Very High Quality";
case SOXR_HQ:
return "High Quality";
case SOXR_MQ:
return "Medium Quality";
case SOXR_LQ:
return "Low Quality";
case SOXR_QQ:
return "Quick";
}
gcc_unreachable();
}
static bool
soxr_parse_converter(const char *converter)
{
assert(converter != nullptr);
assert(memcmp(converter, "soxr", 4) == 0);
if (converter[4] == '\0')
return true;
if (converter[4] != ' ')
return false;
// converter example is "soxr very high", we want the "very high" part
const char *quality = converter + 5;
if (strcmp(quality, "very high") == 0)
soxr_quality_recipe = SOXR_VHQ;
else if (strcmp(quality, "high") == 0)
soxr_quality_recipe = SOXR_HQ;
else if (strcmp(quality, "medium") == 0)
soxr_quality_recipe = SOXR_MQ;
else if (strcmp(quality, "low") == 0)
soxr_quality_recipe = SOXR_LQ;
else if (strcmp(quality, "quick") == 0)
soxr_quality_recipe = SOXR_QQ;
else
return false;
return true;
}
bool
pcm_resample_soxr_global_init(const char *converter, Error &error)
{
if (!soxr_parse_converter(converter)) {
error.Format(soxr_domain,
"unknown samplerate converter '%s'", converter);
return false;
}
FormatDebug(soxr_domain,
"soxr converter '%s'",
soxr_quality_name(soxr_quality_recipe));
return true;
}
AudioFormat
SoxrPcmResampler::Open(AudioFormat &af, unsigned new_sample_rate,
Error &error)
{
assert(af.IsValid());
assert(audio_valid_sample_rate(new_sample_rate));
soxr_error_t e;
soxr_quality_spec_t quality = soxr_quality_spec(soxr_quality_recipe, 0);
soxr = soxr_create(af.sample_rate, new_sample_rate,
af.channels, &e,
nullptr, &quality, nullptr);
if (soxr == nullptr) {
error.Format(soxr_domain,
"soxr initialization has failed: %s", e);
return AudioFormat::Undefined();
}
FormatDebug(soxr_domain, "soxr engine '%s'", soxr_engine(soxr));
channels = af.channels;
ratio = float(new_sample_rate) / float(af.sample_rate);
FormatDebug(soxr_domain,
"samplerate conversion ratio to %.2lf",
ratio);
/* libsoxr works with floating point samples */
af.format = SampleFormat::FLOAT;
AudioFormat result = af;
result.sample_rate = new_sample_rate;
return result;
}
void
SoxrPcmResampler::Close()
{
soxr_delete(soxr);
}
ConstBuffer<void>
SoxrPcmResampler::Resample(ConstBuffer<void> src, Error &error)
{
const size_t frame_size = channels * sizeof(float);
assert(src.size % frame_size == 0);
const size_t n_frames = src.size / frame_size;
const size_t o_frames = size_t(n_frames * ratio + 0.5);
float *output_buffer = (float *)buffer.Get(o_frames * frame_size);
size_t i_done, o_done;
soxr_error_t e = soxr_process(soxr, src.data, n_frames, &i_done,
output_buffer, o_frames, &o_done);
if (e != nullptr) {
error.Format(soxr_domain, "soxr error: %s", e);
return nullptr;
}
return { output_buffer, o_done * frame_size };
}
|
