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
|
/*
* Copyright 2009-2011 Jörg Hermann Müller
*
* This file is part of AudaSpace.
*
* Audaspace 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.
*
* AudaSpace 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 Audaspace; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/** \file audaspace/SRC/AUD_SRCResampleReader.cpp
* \ingroup audsrc
*/
#include "AUD_SRCResampleReader.h"
#include <cmath>
#include <cstring>
#include <cstdio>
static long src_callback(void *cb_data, float **data)
{
return ((AUD_SRCResampleReader*)cb_data)->doCallback(data);
}
static const char* state_error = "AUD_SRCResampleReader: SRC State couldn't be "
"created.";
AUD_SRCResampleReader::AUD_SRCResampleReader(AUD_Reference<AUD_IReader> reader,
AUD_Specs specs) :
AUD_ResampleReader(reader, specs.rate),
m_channels(reader->getSpecs().channels),
m_position(0)
{
int error;
m_src = src_callback_new(src_callback,
SRC_SINC_MEDIUM_QUALITY,
m_channels,
&error,
this);
if(!m_src)
{
// XXX printf("%s\n", src_strerror(error));
AUD_THROW(AUD_ERROR_SRC, state_error);
}
}
AUD_SRCResampleReader::~AUD_SRCResampleReader()
{
src_delete(m_src);
}
long AUD_SRCResampleReader::doCallback(float** data)
{
AUD_Specs specs;
specs.channels = m_channels;
specs.rate = m_rate;
int length = m_buffer.getSize() / AUD_SAMPLE_SIZE(specs);
*data = m_buffer.getBuffer();
m_reader->read(length, m_eos, *data);
return length;
}
void AUD_SRCResampleReader::seek(int position)
{
AUD_Specs specs = m_reader->getSpecs();
double factor = double(m_rate) / double(specs.rate);
m_reader->seek(position / factor);
src_reset(m_src);
m_position = position;
}
int AUD_SRCResampleReader::getLength() const
{
AUD_Specs specs = m_reader->getSpecs();
double factor = double(m_rate) / double(specs.rate);
return m_reader->getLength() * factor;
}
int AUD_SRCResampleReader::getPosition() const
{
return m_position;
}
AUD_Specs AUD_SRCResampleReader::getSpecs() const
{
AUD_Specs specs = m_reader->getSpecs();
specs.rate = m_rate;
return specs;
}
void AUD_SRCResampleReader::read(int& length, bool& eos, sample_t* buffer)
{
AUD_Specs specs = m_reader->getSpecs();
double factor = double(m_rate) / double(specs.rate);
specs.rate = m_rate;
int size = length;
m_buffer.assureSize(length * AUD_SAMPLE_SIZE(specs));
if(specs.channels != m_channels)
{
src_delete(m_src);
m_channels = specs.channels;
int error;
m_src = src_callback_new(src_callback,
SRC_SINC_MEDIUM_QUALITY,
m_channels,
&error,
this);
if(!m_src)
{
// XXX printf("%s\n", src_strerror(error));
AUD_THROW(AUD_ERROR_SRC, state_error);
}
}
m_eos = false;
length = src_callback_read(m_src, factor, length, buffer);
m_position += length;
eos = m_eos && (length < size);
}
|