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
|
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006 Chris Cannam.
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. See the file
COPYING included with this distribution for more information.
*/
#ifndef _AUDIO_FILE_READER_H_
#define _AUDIO_FILE_READER_H_
#include <QString>
#include "base/BaseTypes.h"
#include "FileSource.h"
#include <vector>
#include <map>
typedef std::vector<float> SampleBlock;
class AudioFileReader : public QObject
{
Q_OBJECT
public:
virtual ~AudioFileReader() { }
bool isOK() const { return (m_channelCount > 0); }
virtual QString getError() const { return ""; }
sv_frame_t getFrameCount() const { return m_frameCount; }
int getChannelCount() const { return m_channelCount; }
sv_samplerate_t getSampleRate() const { return m_sampleRate; }
virtual sv_samplerate_t getNativeRate() const { return m_sampleRate; } // if resampled
/**
* Return the location of the audio data in the reader (as passed
* in to the FileSource constructor, for example).
*/
virtual QString getLocation() const { return ""; }
/**
* Return the title of the work in the audio file, if known. This
* may be implemented by subclasses that support file tagging.
* This is not the same thing as the file name.
*/
virtual QString getTitle() const { return ""; }
/**
* Return the "maker" of the work in the audio file, if known.
* This could represent almost anything (band, composer,
* conductor, artist etc).
*/
virtual QString getMaker() const { return ""; }
/**
* Return the local file path of the audio data. This is the
* location most likely to contain readable audio data: it may be
* in a different place or format from the originally specified
* location, for example if the file has been retrieved and
* decoded. In some cases there may be no local file path, and
* this will return "" if there is none.
*/
virtual QString getLocalFilename() const { return ""; }
typedef std::map<QString, QString> TagMap;
virtual TagMap getTags() const { return TagMap(); }
/**
* Return true if this file supports fast seek and random
* access. Typically this will be true for uncompressed formats
* and false for compressed ones.
*/
virtual bool isQuicklySeekable() const = 0;
/**
* Return interleaved samples for count frames from index start.
* The resulting sample block will contain count *
* getChannelCount() samples (or fewer if end of file is
* reached). The caller does not need to allocate space and any
* existing content in the SampleBlock will be erased.
*
* The subclass implementations of this function must be
* thread-safe -- that is, safe to call from multiple threads with
* different arguments on the same object at the same time.
*/
virtual SampleBlock getInterleavedFrames(sv_frame_t start, sv_frame_t count) const = 0;
/**
* Return de-interleaved samples for count frames from index
* start. Implemented in this class (it calls
* getInterleavedFrames and de-interleaves). The resulting vector
* will contain getChannelCount() sample blocks of count samples
* each (or fewer if end of file is reached).
*/
virtual std::vector<SampleBlock> getDeInterleavedFrames(sv_frame_t start, sv_frame_t count) const;
// only subclasses that do not know exactly how long the audio
// file is until it's been completely decoded should implement this
virtual int getDecodeCompletion() const { return 100; } // %
virtual bool isUpdating() const { return false; }
signals:
void frameCountChanged();
protected:
sv_frame_t m_frameCount;
int m_channelCount;
sv_samplerate_t m_sampleRate;
};
#endif
|
