diff options
Diffstat (limited to 'src/main/java/se/lublin/humla/audio/encoder/ResamplingEncoder.java')
-rw-r--r-- | src/main/java/se/lublin/humla/audio/encoder/ResamplingEncoder.java | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/main/java/se/lublin/humla/audio/encoder/ResamplingEncoder.java b/src/main/java/se/lublin/humla/audio/encoder/ResamplingEncoder.java new file mode 100644 index 0000000..5411dbb --- /dev/null +++ b/src/main/java/se/lublin/humla/audio/encoder/ResamplingEncoder.java @@ -0,0 +1,87 @@ +/* + * 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; + } +} |