CodecFactory.java

package org.red5.app.sip.codecs;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CodecFactory {    
    protected static Logger log = LoggerFactory.getLogger(CodecFactory.class);
    
    // Available audio codecs
    private static final int audioCodecPCMU = 0;     
    private static final int audioCodecPCMA = 8;    
    private static final int audioCodecG729 = 18;
    private static final int audioCodecSpeex = 100;
    private static final int audioCodeciLBC = 111;
    
    private int[] availableAudioCodecsId = {audioCodecPCMU, audioCodecPCMA, audioCodecG729, audioCodecSpeex, audioCodeciLBC};
    private int[] availableVideoCodecsId = {};        
    private static CodecFactory singletonSIPCodecFactory = new CodecFactory();
    
    private static String[] codecCommonAudioMediaAttributes = {"ptime:20"};
            
    public static CodecFactory getInstance() {
        return singletonSIPCodecFactory;
    }
    
    /**
     * Create a new instance of SIPCodec by codec id.
     * @return The codec associated with "codecId".
     * */
    public Codec getSIPAudioCodec(int codecId) {        
        Codec sipCodec;       
        printLog("getSIPAudioCodec", "codecId = [" + codecId + "].");
        
        switch (codecId) {
            case audioCodecPCMU:
                sipCodec = new PCMUCodec();
                break;
            case audioCodecPCMA:
                sipCodec = new PCMACodec();
                break;
            case audioCodecG729:
                sipCodec = new G729Codec();
                break;
            case audioCodecSpeex:
                sipCodec = new SpeexCodec();
                break;
            case audioCodeciLBC:
                sipCodec = new ILBCCodec();
                break;
            default:
                sipCodec = null;
        }
        
        if (sipCodec != null) {            
            printLog( "getSIPAudioCodec", 
                    "codecId = [" + sipCodec.getCodecId() + 
                    "], codecName =  [" + sipCodec.getCodecName() + "]." );
        }
        
        return sipCodec;
    }
    
    /**
     * Get all available audio codecs
     * @return SIPCodec array containing all audio codecs instances
     */
    public Codec[] getAvailableAudioCodecs() {        
        printLog( "getAvailableAudioCodecs", "Init..." );
        
        Codec[] availableCodecs = new Codec[availableAudioCodecsId.length];
        
        for (int i = 0; i < availableAudioCodecsId.length; i++) {
            int codecId = availableAudioCodecsId[ i ];
            Codec codec = getSIPAudioCodec( codecId );
            availableCodecs[i] = codec;            
        }
        
        return availableCodecs;
        
    }
    
    /**
     * Get all available video codecs
     * @return SIPCodec array containing all video codecs instances
     */
    public Codec[] getAvailableVideoCodecs() {        
        printLog( "getAvailableVideoCodecs", "Init..." );
        
        Codec[] availableCodecs = new Codec[availableVideoCodecsId.length];
        
        for (int i = 0; i < availableVideoCodecsId.length; i++) {
            int codecId = availableVideoCodecsId[i];
            Codec codec = getSIPAudioCodec(codecId);
            availableCodecs[i] = codec;            
        }
        
        return availableCodecs;
        
    }
    
    /**
     * Get all available codecs
     * @param codecsPrecedence semicolon separated ids from the codecs
     * @return SIPCodec array containing all codecs instances
     */
    public Codec[] getAvailableAudioCodecsWithPrecedence(String codecsPrecedence) {        
        int initIndex = 0;
        int finalIndex = codecsPrecedence.indexOf(";");
        String codecId;
        Codec[] availableCodecs = new Codec[availableAudioCodecsId.length];
        int codecsIndex = 0;
        
        printLog( "getAvailableAudioCodecsWithPrecedence", 
                "codecsPrecedence = [" + codecsPrecedence + 
                "], initIndex =  [" + initIndex + 
                "], finalIndex =  [" + finalIndex + "]." );
        
        while ( initIndex < finalIndex ) {            
            codecId = codecsPrecedence.substring(initIndex, finalIndex);
            
            printLog( "getAvailableAudioCodecsWithPrecedence", "codecId = [" + codecId + "]." );
            
            Codec sipCodec = getSIPAudioCodec(Integer.valueOf( codecId ).intValue());
            
            if (sipCodec != null) {                
                printLog( "getAvailableAudioCodecsWithPrecedence", 
                        "codecId = [" + sipCodec.getCodecId() + 
                        "], codecName =  [" + sipCodec.getCodecName() + "]." );
                
                availableCodecs[codecsIndex] = sipCodec;
                codecsIndex++;
                
                initIndex = finalIndex+1;
                finalIndex = codecsPrecedence.indexOf(";", initIndex);
                
                if ( (finalIndex == -1 ) && 
                        ( initIndex <= codecsPrecedence.length() ) ) {

                    finalIndex = codecsPrecedence.length();
                }
                
                printLog( "getAvailableAudioCodecsWithPrecedence", 
                        "codecsIndex = [" + codecsIndex + 
                        "], initIndex =  [" + initIndex + 
                        "], finalIndex =  [" + finalIndex + "]." );
            }
            else {
                
                printLog( "getAvailableAudioCodecsWithPrecedence", 
                        "Problem with value [" + codecId + 
                        "] retrieved from [" + codecsPrecedence + "].");
            }
        }
        
        return availableCodecs;
        
    }
    
    /**
     * @return Count of available audio codecs
     */
    public int getAvailableAudioCodecsCount() {        
        return availableAudioCodecsId.length;
    }
    
    /**
     * @return Count of available video codecs
     */
    public int getAvailableVideoCodecsCount() {        
        return availableVideoCodecsId.length;
    }
    
    public String[] getCommonAudioMediaAttributes() {        
        return codecCommonAudioMediaAttributes;
    }
    
    public String[] getCommonVideoMediaAttributes() {        
        return null;
    }


    private static void printLog( String method, String message ) {        
        log.debug( "SCodecFactory - " + method + " -> " + message );
        System.out.println("CodecFactory - " + method + " -> " + message );
    }
}