mirror of https://github.com/dcoredump/dexed.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
3.9 KiB
107 lines
3.9 KiB
/*
|
|
==============================================================================
|
|
|
|
This file is part of the JUCE library.
|
|
Copyright (c) 2013 - Raw Material Software Ltd.
|
|
|
|
Permission is granted to use this software under the terms of either:
|
|
a) the GPL v2 (or any later version)
|
|
b) the Affero GPL v3
|
|
|
|
Details of these licenses can be found at: www.gnu.org/licenses
|
|
|
|
JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
|
|
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
|
|
|
|
------------------------------------------------------------------------------
|
|
|
|
To release a closed-source product which uses JUCE, commercial licenses are
|
|
available: visit www.juce.com for more information.
|
|
|
|
==============================================================================
|
|
*/
|
|
|
|
#ifndef JUCE_RESAMPLINGAUDIOSOURCE_H_INCLUDED
|
|
#define JUCE_RESAMPLINGAUDIOSOURCE_H_INCLUDED
|
|
|
|
|
|
//==============================================================================
|
|
/**
|
|
A type of AudioSource that takes an input source and changes its sample rate.
|
|
|
|
@see AudioSource
|
|
*/
|
|
class JUCE_API ResamplingAudioSource : public AudioSource
|
|
{
|
|
public:
|
|
//==============================================================================
|
|
/** Creates a ResamplingAudioSource for a given input source.
|
|
|
|
@param inputSource the input source to read from
|
|
@param deleteInputWhenDeleted if true, the input source will be deleted when
|
|
this object is deleted
|
|
@param numChannels the number of channels to process
|
|
*/
|
|
ResamplingAudioSource (AudioSource* inputSource,
|
|
bool deleteInputWhenDeleted,
|
|
int numChannels = 2);
|
|
|
|
/** Destructor. */
|
|
~ResamplingAudioSource();
|
|
|
|
/** Changes the resampling ratio.
|
|
|
|
(This value can be changed at any time, even while the source is running).
|
|
|
|
@param samplesInPerOutputSample if set to 1.0, the input is passed through; higher
|
|
values will speed it up; lower values will slow it
|
|
down. The ratio must be greater than 0
|
|
*/
|
|
void setResamplingRatio (double samplesInPerOutputSample);
|
|
|
|
/** Returns the current resampling ratio.
|
|
|
|
This is the value that was set by setResamplingRatio().
|
|
*/
|
|
double getResamplingRatio() const noexcept { return ratio; }
|
|
|
|
/** Clears any buffers and filters that the resampler is using. */
|
|
void flushBuffers();
|
|
|
|
//==============================================================================
|
|
void prepareToPlay (int samplesPerBlockExpected, double sampleRate) override;
|
|
void releaseResources() override;
|
|
void getNextAudioBlock (const AudioSourceChannelInfo&) override;
|
|
|
|
private:
|
|
//==============================================================================
|
|
OptionalScopedPointer<AudioSource> input;
|
|
double ratio, lastRatio;
|
|
AudioSampleBuffer buffer;
|
|
int bufferPos, sampsInBuffer;
|
|
double subSampleOffset;
|
|
double coefficients[6];
|
|
SpinLock ratioLock;
|
|
const int numChannels;
|
|
HeapBlock<float*> destBuffers;
|
|
HeapBlock<const float*> srcBuffers;
|
|
|
|
void setFilterCoefficients (double c1, double c2, double c3, double c4, double c5, double c6);
|
|
void createLowPass (double proportionalRate);
|
|
|
|
struct FilterState
|
|
{
|
|
double x1, x2, y1, y2;
|
|
};
|
|
|
|
HeapBlock<FilterState> filterStates;
|
|
void resetFilters();
|
|
|
|
void applyFilter (float* samples, int num, FilterState& fs);
|
|
|
|
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ResamplingAudioSource)
|
|
};
|
|
|
|
|
|
#endif // JUCE_RESAMPLINGAUDIOSOURCE_H_INCLUDED
|
|
|