AndroidAudioRecorder.java

/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.backends.android;

import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;

import com.badlogic.gdx.audio.AudioRecorder;
import com.badlogic.gdx.utils.GdxRuntimeException;

/**
 * {@link AudioRecorder} implementation for the android system based on AudioRecord
 * 
 * @author badlogicgames@gmail.com
 */
public class AndroidAudioRecorder implements AudioRecorder {
	/** the audio track we read samples from **/
	private AudioRecord recorder;

	public AndroidAudioRecorder(int samplingRate, boolean isMono) {
		int channelConfig = isMono ? AudioFormat.CHANNEL_IN_MONO : AudioFormat.CHANNEL_IN_STEREO;
		int minBufferSize = AudioRecord.getMinBufferSize(samplingRate, channelConfig, AudioFormat.ENCODING_PCM_16BIT);
		recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, samplingRate, channelConfig,
				AudioFormat.ENCODING_PCM_16BIT, minBufferSize);
		if (recorder.getState() != AudioRecord.STATE_INITIALIZED)
			throw new GdxRuntimeException(
					"Unable to initialize AudioRecorder.\nDo you have the RECORD_AUDIO permission?");
		recorder.startRecording();
	}

	@Override
	public void dispose() {
		recorder.stop();
		recorder.release();
	}

	@Override
	public void read(short[] samples, int offset, int numSamples) {
		int read = 0;
		while (read != numSamples) {
			read += recorder.read(samples, offset + read, numSamples - read);
		}
	}

}