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106 lines
4 KiB
C++
106 lines
4 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library - "Jules' Utility Class Extensions"
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Copyright 2004-11 by Raw Material Software Ltd.
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------------------------------------------------------------------------------
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JUCE can be redistributed and/or modified under the terms of the GNU General
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Public License (Version 2), as published by the Free Software Foundation.
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A copy of the license is included in the JUCE distribution, or can be found
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online at www.gnu.org/licenses.
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.rawmaterialsoftware.com/juce for more information.
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==============================================================================
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*/
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#ifndef __JUCE_RESAMPLINGAUDIOSOURCE_JUCEHEADER__
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#define __JUCE_RESAMPLINGAUDIOSOURCE_JUCEHEADER__
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#include "juce_AudioSource.h"
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//==============================================================================
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/**
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A type of AudioSource that takes an input source and changes its sample rate.
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@see AudioSource
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*/
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class JUCE_API ResamplingAudioSource : public AudioSource
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{
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public:
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//==============================================================================
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/** Creates a ResamplingAudioSource for a given input source.
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@param inputSource the input source to read from
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@param deleteInputWhenDeleted if true, the input source will be deleted when
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this object is deleted
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@param numChannels the number of channels to process
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*/
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ResamplingAudioSource (AudioSource* inputSource,
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bool deleteInputWhenDeleted,
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int numChannels = 2);
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/** Destructor. */
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~ResamplingAudioSource();
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/** Changes the resampling ratio.
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(This value can be changed at any time, even while the source is running).
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@param samplesInPerOutputSample if set to 1.0, the input is passed through; higher
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values will speed it up; lower values will slow it
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down. The ratio must be greater than 0
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*/
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void setResamplingRatio (double samplesInPerOutputSample);
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/** Returns the current resampling ratio.
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This is the value that was set by setResamplingRatio().
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*/
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double getResamplingRatio() const noexcept { return ratio; }
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//==============================================================================
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void prepareToPlay (int samplesPerBlockExpected, double sampleRate);
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void releaseResources();
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void getNextAudioBlock (const AudioSourceChannelInfo& bufferToFill);
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private:
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//==============================================================================
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OptionalScopedPointer<AudioSource> input;
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double ratio, lastRatio;
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AudioSampleBuffer buffer;
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int bufferPos, sampsInBuffer;
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double subSampleOffset;
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double coefficients[6];
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SpinLock ratioLock;
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const int numChannels;
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HeapBlock<float*> destBuffers, srcBuffers;
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void setFilterCoefficients (double c1, double c2, double c3, double c4, double c5, double c6);
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void createLowPass (double proportionalRate);
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struct FilterState
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{
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double x1, x2, y1, y2;
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};
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HeapBlock<FilterState> filterStates;
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void resetFilters();
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void applyFilter (float* samples, int num, FilterState& fs);
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ResamplingAudioSource);
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};
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#endif // __JUCE_RESAMPLINGAUDIOSOURCE_JUCEHEADER__
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