Audaspace 1.4.0
A high level audio library.
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JOSResampleReader.h
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1/*******************************************************************************
2 * Copyright 2009-2016 Jörg Müller
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 ******************************************************************************/
16
17#pragma once
18
26#include "util/Buffer.h"
27
29
34{
35private:
36 typedef void (JOSResampleReader::*resample_f)(double target_factor, int length, sample_t* buffer);
37
41 static const int m_len;
42
46 static const int m_L;
47
51 static const float m_coeff[];
52
56 Channels m_channels;
57
61 unsigned int m_n;
62
66 double m_P;
67
71 Buffer m_buffer;
72
76 Buffer m_sums;
77
81 int m_cache_valid;
82
86 resample_f m_resample;
87
91 double m_last_factor;
92
93 // delete copy constructor and operator=
94 JOSResampleReader(const JOSResampleReader&) = delete;
95 JOSResampleReader& operator=(const JOSResampleReader&) = delete;
96
100 void AUD_LOCAL reset();
101
108 void AUD_LOCAL updateBuffer(int size, double factor, int samplesize);
109
110 void AUD_LOCAL resample(double target_factor, int length, sample_t* buffer);
111 void AUD_LOCAL resample_mono(double target_factor, int length, sample_t* buffer);
112 void AUD_LOCAL resample_stereo(double target_factor, int length, sample_t* buffer);
113
114public:
120 JOSResampleReader(std::shared_ptr<IReader> reader, SampleRate rate);
121
122 virtual void seek(int position);
123 virtual int getLength() const;
124 virtual int getPosition() const;
125 virtual Specs getSpecs() const;
126 virtual void read(int& length, bool& eos, sample_t* buffer);
127};
128
#define AUD_NAMESPACE_END
Closes the audaspace namespace aud.
Definition: Audaspace.h:119
float sample_t
Sample type.(float samples)
Definition: Audaspace.h:126
#define AUD_LOCAL
Used for hiding symbols from export in the shared library.
Definition: Audaspace.h:80
#define AUD_NAMESPACE_BEGIN
Opens the audaspace namespace aud.
Definition: Audaspace.h:116
#define AUD_API
Used for exporting symbols in the shared library.
Definition: Audaspace.h:93
The Buffer class.
The ResampleReader class.
double SampleRate
Sample rate type.
Definition: Specification.h:106
Channels
The channel count.
Definition: Specification.h:59
This class is a simple buffer in RAM which is 32 Byte aligned and provides resize functionality.
Definition: Buffer.h:34
This resampling reader uses Julius O.
Definition: JOSResampleReader.h:34
virtual void seek(int position)
Seeks to a specific position in the source.
virtual Specs getSpecs() const
Returns the specification of the reader.
JOSResampleReader(std::shared_ptr< IReader > reader, SampleRate rate)
Creates a resampling reader.
virtual void read(int &length, bool &eos, sample_t *buffer)
Request to read the next length samples out of the source.
virtual int getPosition() const
Returns the position of the source as a sample count value.
virtual int getLength() const
Returns an approximated length of the source in samples.
This is the base class for all resampling readers.
Definition: ResampleReader.h:33
Specification of a sound source.
Definition: Specification.h:110