SpeexToSpeexTranscoder.java

package org.red5.app.sip.trancoders;

import org.apache.mina.core.buffer.IoBuffer;
import org.red5.app.sip.codecs.Codec;
import org.red5.app.sip.stream.RtpStreamSender;
import org.red5.server.net.rtmp.event.AudioData;

public class SpeexToSpeexTranscoder implements Transcoder {

	private Codec audioCodec;
	private TranscodedAudioDataListener listener;
	private int timestamp = 0;
	
	private static final int SPEEX_CODEC = 178; /* 1011 1111 (see flv spec) */
	
	public SpeexToSpeexTranscoder(Codec audioCodec, TranscodedAudioDataListener listener) {
		this.audioCodec = audioCodec;
		this.listener = listener;
	}
	
	public SpeexToSpeexTranscoder(Codec audioCodec) {
		this.audioCodec = audioCodec;
	}
	
	public void transcode(byte[] asaoBuffer, int offset, int num,
			byte[] transcodedData, int dataOffset, RtpStreamSender rtpSender) {
		System.arraycopy(asaoBuffer, offset, transcodedData, dataOffset, num);
		rtpSender.sendTranscodedData();
	}

	public void transcode(byte[] codedBuffer) {
		pushAudio(codedBuffer);
	}

	private void pushAudio(byte[] audio) {
    	timestamp = timestamp + audio.length;
    	
        IoBuffer buffer = IoBuffer.allocate(1024);
        buffer.setAutoExpand(true);

        buffer.clear();

        buffer.put((byte) SPEEX_CODEC); 
        byte[] copy = new byte[audio.length];
	    System.arraycopy(audio, 0, copy, 0, audio.length );
        
        buffer.put(copy);        
        buffer.flip();

        AudioData audioData = new AudioData( buffer );
        audioData.setTimestamp((int)timestamp );

        listener.handleTranscodedAudioData(audioData);
    }

	public int getCodecId() {
		return audioCodec.getCodecId();
	}

	public int getOutgoingEncodedFrameSize() {
		return audioCodec.getOutgoingEncodedFrameSize();
	}

	public int getOutgoingPacketization() {
		return audioCodec.getOutgoingPacketization();
	}

	public int getIncomingEncodedFrameSize() {
		return audioCodec.getIncomingEncodedFrameSize();
	}
}