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/*
* Copyright (C) 2014 Andrew Comminos
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package se.lublin.humla.audio.encoder;
import se.lublin.humla.audio.javacpp.Speex;
import se.lublin.humla.exception.NativeAudioException;
import se.lublin.humla.net.PacketBuffer;
import java.nio.BufferUnderflowException;
/**
* Wraps around another encoder, resampling up/down all input using the Speex resampler.
* Created by andrew on 16/04/14.
*/
public class ResamplingEncoder implements IEncoder {
private static final int SPEEX_RESAMPLE_QUALITY = 3;
private IEncoder mEncoder;
private Speex.SpeexResampler mResampler;
private final int mInputSampleRate;
private final int mTargetSampleRate;
private final int mTargetFrameSize;
private final short[] mResampleBuffer;
public ResamplingEncoder(IEncoder encoder, int channels, int inputSampleRate, int targetFrameSize, int targetSampleRate) {
mEncoder = encoder;
mInputSampleRate = inputSampleRate;
mTargetSampleRate = targetSampleRate;
mTargetFrameSize = targetFrameSize;
mResampleBuffer = new short[mTargetFrameSize];
mResampler = new Speex.SpeexResampler(channels, inputSampleRate, targetSampleRate, SPEEX_RESAMPLE_QUALITY);
}
@Override
public int encode(short[] input, int inputSize) throws NativeAudioException {
mResampler.resample(input, mResampleBuffer);
return mEncoder.encode(mResampleBuffer, mTargetFrameSize);
}
@Override
public int getBufferedFrames() {
return mEncoder.getBufferedFrames();
}
@Override
public boolean isReady() {
return mEncoder.isReady();
}
@Override
public void getEncodedData(PacketBuffer packetBuffer) throws BufferUnderflowException {
mEncoder.getEncodedData(packetBuffer);
}
@Override
public void terminate() throws NativeAudioException {
mEncoder.terminate();
}
public void setEncoder(IEncoder encoder) {
if(mEncoder != null) mEncoder.destroy();
mEncoder = encoder;
}
@Override
public void destroy() {
mResampler.destroy();
mEncoder.destroy();
mResampler = null;
mEncoder = null;
}
}
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