openshot-audio  0.1.6
juce_ResamplingAudioSource.h
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1 /*
2  ==============================================================================
3 
4  This file is part of the JUCE library.
5  Copyright (c) 2015 - ROLI Ltd.
6 
7  Permission is granted to use this software under the terms of either:
8  a) the GPL v2 (or any later version)
9  b) the Affero GPL v3
10 
11  Details of these licenses can be found at: www.gnu.org/licenses
12 
13  JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
14  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
15  A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16 
17  ------------------------------------------------------------------------------
18 
19  To release a closed-source product which uses JUCE, commercial licenses are
20  available: visit www.juce.com for more information.
21 
22  ==============================================================================
23 */
24 
25 #ifndef JUCE_RESAMPLINGAUDIOSOURCE_H_INCLUDED
26 #define JUCE_RESAMPLINGAUDIOSOURCE_H_INCLUDED
27 
28 
29 //==============================================================================
36 {
37 public:
38  //==============================================================================
46  ResamplingAudioSource (AudioSource* inputSource,
47  bool deleteInputWhenDeleted,
48  int numChannels = 2);
49 
52 
61  void setResamplingRatio (double samplesInPerOutputSample);
62 
67  double getResamplingRatio() const noexcept { return ratio; }
68 
70  void flushBuffers();
71 
72  //==============================================================================
73  void prepareToPlay (int samplesPerBlockExpected, double sampleRate) override;
74  void releaseResources() override;
75  void getNextAudioBlock (const AudioSourceChannelInfo&) override;
76 
77 private:
78  //==============================================================================
80  double ratio, lastRatio;
82  int bufferPos, sampsInBuffer;
83  double subSampleOffset;
84  double coefficients[6];
85  SpinLock ratioLock;
86  const int numChannels;
87  HeapBlock<float*> destBuffers;
88  HeapBlock<const float*> srcBuffers;
89 
90  void setFilterCoefficients (double c1, double c2, double c3, double c4, double c5, double c6);
91  void createLowPass (double proportionalRate);
92 
93  struct FilterState
94  {
95  double x1, x2, y1, y2;
96  };
97 
98  HeapBlock<FilterState> filterStates;
99  void resetFilters();
100 
101  void applyFilter (float* samples, int num, FilterState& fs);
102 
104 };
105 
106 
107 #endif // JUCE_RESAMPLINGAUDIOSOURCE_H_INCLUDED
Definition: juce_AudioSampleBuffer.h:34
Definition: juce_AudioSource.h:110
#define noexcept
Definition: juce_CompilerSupport.h:141
Definition: juce_ResamplingAudioSource.h:35
Definition: juce_SpinLock.h:46
virtual void releaseResources()=0
#define JUCE_API
Definition: juce_StandardHeader.h:139
#define const
JOCTET * buffer
Definition: juce_JPEGLoader.cpp:302
virtual void prepareToPlay(int samplesPerBlockExpected, double sampleRate)=0
Definition: juce_AudioSource.h:33
virtual void getNextAudioBlock(const AudioSourceChannelInfo &bufferToFill)=0
#define JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(className)
Definition: juce_PlatformDefs.h:198
double getResamplingRatio() const noexcept
Definition: juce_ResamplingAudioSource.h:67