/*
* RED5 Open Source Flash Server - http://code.google.com/p/red5/
*
* Copyright 2006-2014 by respective authors (see below). All rights reserved.
*
* 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 org.red5.server.stream;
import java.util.ArrayList;
import java.util.List;
import org.apache.mina.core.buffer.IoBuffer;
import org.red5.codec.IAudioStreamCodec;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Factory for audio codecs. Creates and returns audio codecs
*
* @author The Red5 Project
* @author Vladimir Hmelyoff (vlhm@splitmedialabs.com)
*/
public class AudioCodecFactory {
/**
* Object key
*/
public static final String KEY = "audioCodecFactory";
/**
* Logger for audio factory
*/
private static Logger log = LoggerFactory.getLogger(AudioCodecFactory.class);
/**
* List of available codecs
*/
private static List<IAudioStreamCodec> codecs = new ArrayList<IAudioStreamCodec>(1);
/**
* Setter for codecs
*
* @param codecs List of codecs
*/
public void setCodecs(List<IAudioStreamCodec> codecs) {
AudioCodecFactory.codecs = codecs;
}
/**
* Create and return new audio codec applicable for byte buffer data
* @param data Byte buffer data
* @return audio codec
*/
public static IAudioStreamCodec getAudioCodec(IoBuffer data) {
IAudioStreamCodec result = null;
try {
//get the codec identifying byte
int codecId = (data.get() & 0xf0) >> 4;
switch (codecId) {
case 10: //aac
result = (IAudioStreamCodec) Class.forName("org.red5.codec.AACAudio").newInstance();
break;
// TODO add SPEEX support?
}
data.rewind();
} catch (Exception ex) {
log.error("Error creating codec instance", ex);
}
//if codec is not found do the old-style loop
if (result == null) {
for (IAudioStreamCodec storedCodec: codecs) {
IAudioStreamCodec codec;
// XXX: this is a bit of a hack to create new instances of the
// configured audio codec for each stream
try {
codec = storedCodec.getClass().newInstance();
} catch (Exception e) {
log.error("Could not create audio codec instance", e);
continue;
}
if (codec.canHandleData(data)) {
result = codec;
break;
}
}
}
return result;
}
}