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
// Copyright (c) 2012-2017 VideoStitch SAS
// Copyright (c) 2018 stitchEm
//
// A class to resample audio samples
#pragma once
#include "libvideostitch/status.hpp"
#include "libvideostitch/audio.hpp"
#include "libvideostitch/audioObject.hpp"
#include "converter.hpp"
#include <fstream>
#ifndef R8BLIB_UNSUPPORTED
#if _MSC_VER
// To disable warnings on the external r8b library
#pragma warning(push)
#pragma warning(disable : 4127)
#pragma warning(disable : 4201)
#include <r8b-src/CDSPResampler.h>
#pragma warning(pop)
#else
#include <r8b-src/CDSPResampler.h>
#endif
#endif
namespace VideoStitch {
namespace Audio {
// Helper to convert Samples to AudioBlock
void samples2AudioBlock(AudioBlock &out, const Samples &in);
// Helper to convert AudioBlock to Samples
void audioBlock2Samples(Samples &out, const AudioBlock &in);
class AudioResampler {
public:
~AudioResampler();
///
/// \brief Create an audio resampler
/// \param _inRate input sampling rate
/// \param _inDepth input sampling depth
/// \param _outRate output sampling rate
/// \param _outDepth output sampling depth
/// \param _layout audio layout
/// \param _blockSize size in samples of the internal block
///
static AudioResampler *create(const SamplingRate _inRate, const SamplingDepth _inDepth, const SamplingRate _outRate,
const SamplingDepth _outDepth, const ChannelLayout _layout, const size_t _blockSizeIn);
///
/// \brief Resamples the input audio to output audio
/// the input should correspond to the channel index given
/// C-style function the memory has to be managed by the user
/// \param in Pointer on the input buffer
/// \param nbSamplesin number of input samples
/// \param out Pointer on the output buffer
/// \param channelIndex Index of the channel corresponding to the input pointer
///
int resample(const audioSample_t *in, size_t nbSamplesin, audioSample_t *&out, const uint32_t channelIndex);
///
/// \brief Resamples the input audio to output audio
/// This transforms an Audio::Samples and into an AudioBloack
///
/// \param audioSamplesIn input audio samples
/// \param audioBlockOut output audio samples
///
void resample(const Audio::Samples &audioSamplesIn, AudioBlock &audioBlockOut);
///
/// \brief Resamples the input audio to output audio
/// This transforms an AudioBlock into an Audio::Samples
///
/// \param audioBlockIn input audio samples
/// \param audioSamplesOut output audio samples
///
void resample(const AudioBlock &audioBlockIn, Audio::Samples &audioSamplesOut);
///
/// \brief Returns the blockSize
/// \return block size
///
int getBlockSize() { return _blockSizeIn; }
private:
///
/// \brief Constructs an audio resampler
/// \param _inRate input sampling rate
/// \param _inDepth input sampling depth (not used)
/// \param _outRate output sampling rate
/// \param _outDepth output sampling depth (not used)
/// \param _layout audio layout
/// \param _blockSize size in samples of the internal block
///
AudioResampler(const SamplingRate _inRate, const SamplingDepth, const SamplingRate _outRate, const SamplingDepth,
const ChannelLayout _layout, const int _blockSizeIn);
int convertFltPToDblP(const float *in, audioSample_t *out);
void alloc();
void dumpInput(const ChannelMap channelType);
void dumpOutput(int nResampled, const int iChannel, const ChannelMap channelType);
#ifndef R8BLIB_UNSUPPORTED
r8b::CPtrKeeper<r8b::CDSPResampler24 *> _resamps[MAX_AUDIO_CHANNELS];
#endif
mtime_t _offsettime;
double _inRate; // source sample rate
double _outRate; // destination sample rate
SamplingDepth _inDepth;
SamplingDepth _outDepth;
ChannelLayout _layout;
int _blockSizeIn;
int _blockSizeOut;
#ifndef R8BLIB_UNSUPPORTED
r8b::CFixedBuffer<audioSample_t> _internalBuf;
#endif
audioSample_t **_outData;
audioSample_t **_keepPtr;
bool _dump;
std::ofstream _inFile;
std::ofstream _outFile;
int _iWriteCount;
};
} // namespace Audio
} // namespace VideoStitch