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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.media.server.component;

import org.mobicents.media.server.spi.dsp.Codec;
import org.mobicents.media.server.spi.dsp.Processor;
import org.mobicents.media.server.spi.format.Format;
import org.mobicents.media.server.spi.memory.Frame;

/**
 * Digital signaling processor.
 *
 * DSP transforms media from its original format to one of the specified
 * output format. Output formats are specified as array where order of the
 * formats defines format's priority. If frame has format matching to output
 * format the frame won't be changed.
 *
 * @author kulikov
 */
public class Dsp implements Processor {
    private Codec codec;
    private Codec[] codecs;

    //The current format of the frame stream
    private Format sourceFormat,destinationFormat;    
    
    /**
     * Creates new instance of processor.
     *
     * @param codecs
     */
    protected Dsp(Codec[] codecs) {
        this.codecs = codecs;
    }

    @Override
    public Codec[] getCodecs() {
        return codecs;
    }    
	    
    @Override
    public Frame process(Frame frame,Format source,Format destination) {
    	if (source==null || destination==null)
			return frame;
		
    	if(source.matches(destination))
    		return frame;
    	
    	//normal flow: format of the stream is already known
		if (sourceFormat!=null && source.matches(sourceFormat) && destinationFormat != null && destination.matches(destinationFormat)) {
			//do transcode if required
			if (codec != null) {
				try {
					return codec.process(frame);
				} finally {
					frame.recycle();
				}
			}

			//return the original frame if no transcoding required
			return frame;
		}
		
		//check that codecs are defined.
		if (codecs == null) {
			//no spade - no questions
			return frame;
		}
		
		for (int i = 0; i < codecs.length; i++) {
			//select codec wich can receive current frame
			if (codecs[i].getSupportedInputFormat().matches(source)) {
				//check if this codec can transform frame to any of the output format
				if (codecs[i].getSupportedOutputFormat().matches(destination)) {
					codec = codecs[i];
					destinationFormat=destination;
					sourceFormat=source;
					break;
				}
			}
		}
		
		//if codec found do the transcoding
		if (codec != null) {
			try {
				return codec.process(frame);
			} finally {
				frame.recycle();
			}    			    			    			
		}    		
		
		//return frame without changes
		return frame;
    }
}