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New low-latency sample rate conversion library

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This commit is contained in:
Ken Cooke 2015-09-22 08:14:08 -07:00
parent 7b5cbbf758
commit 2d1150115f
2 changed files with 4613 additions and 0 deletions
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4552
libraries/audio/src/AudioSRC.cpp Normal file
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libraries/audio/src/AudioSRC.h Normal file
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//
// AudioSRC.h
// libraries/audio/src
//
// Created by Ken Cooke on 9/18/15.
// Copyright 2015 High Fidelity, Inc.
//
// Distributed under the Apache License, Version 2.0.
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
#ifndef hifi_AudioSRC_h
#define hifi_AudioSRC_h
#include "stdint.h"
class AudioSRC {
public:
static const int MAX_CHANNELS = 2;
AudioSRC(int inputSampleRate, int outputSampleRate, int numChannels);
~AudioSRC();
int render(const int16_t* input, int16_t* output, int inputFrames);
int getMinOutput(int inputFrames);
int getMaxOutput(int inputFrames);
int getMinInput(int outputFrames);
int getMaxInput(int outputFrames);
private:
float* _polyphaseFilter;
float* _history[MAX_CHANNELS];
float* _inputs[MAX_CHANNELS];
float* _outputs[MAX_CHANNELS];
int _inputSampleRate;
int _outputSampleRate;
int _numChannels;
int _inputBlock;
int _upFactor;
int _downFactor;
int _numTaps;
int _numHistory;
int64_t _offset;
int64_t _step;
int createPolyphaseFilter(int upFactor, int downFactor, float gain);
int multirateFilter1(const float* input0, float* output0, int inputFrames);
int multirateFilter2(const float* input0, const float* input1, float* output0, float* output1, int inputFrames);
void convertInputFromInt16(const int16_t* input, float** outputs, int numFrames);
void convertOutputToInt16(float** inputs, int16_t* output, int numFrames);
int processFloat(float** inputs, float** outputs, int inputFrames);
};
#endif // AudioSRC_h