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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 com.googlecode.javacpp.IntPointer;
import java.nio.BufferUnderflowException;
import se.lublin.humla.audio.javacpp.Speex;
import se.lublin.humla.exception.NativeAudioException;
import se.lublin.humla.net.PacketBuffer;
/**
* Wrapper performing preprocessing options on the nested encoder.
* Uses Speex preprocessor.
* Created by andrew on 17/04/14.
*/
public class PreprocessingEncoder implements IEncoder {
private IEncoder mEncoder;
private Speex.SpeexPreprocessState mPreprocessor;
public PreprocessingEncoder(IEncoder encoder, int frameSize, int sampleRate) {
mEncoder = encoder;
mPreprocessor = new Speex.SpeexPreprocessState(frameSize, sampleRate);
IntPointer arg = new IntPointer(1);
arg.put(0);
mPreprocessor.control(Speex.SpeexPreprocessState.SPEEX_PREPROCESS_SET_VAD, arg);
arg.put(1);
mPreprocessor.control(Speex.SpeexPreprocessState.SPEEX_PREPROCESS_SET_AGC, arg);
mPreprocessor.control(Speex.SpeexPreprocessState.SPEEX_PREPROCESS_SET_DENOISE, arg);
mPreprocessor.control(Speex.SpeexPreprocessState.SPEEX_PREPROCESS_SET_DEREVERB, arg);
arg.put(30000);
mPreprocessor.control(Speex.SpeexPreprocessState.SPEEX_PREPROCESS_SET_AGC_TARGET, arg);
// TODO AGC max gain, decrement, noise suppress, echo
// Increase VAD difficulty
arg.put(99);
mPreprocessor.control(Speex.SpeexPreprocessState.SPEEX_PREPROCESS_GET_PROB_START, arg);
}
@Override
public int encode(short[] input, int inputSize) throws NativeAudioException {
mPreprocessor.preprocess(input);
return mEncoder.encode(input, inputSize);
}
@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() {
mPreprocessor.destroy();
mEncoder.destroy();
mPreprocessor = null;
mEncoder = null;
}
}
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