sdp2media.cxx

SIP（Session Initiation Protocol）是由IETF定义

/* ====================================================================
 * The Vovida Software License, Version 1.0 
 * 
 * Copyright (c) 2000 Vovida Networks, Inc.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The names "VOCAL", "Vovida Open Communication Application Library",
 *    and "Vovida Open Communication Application Library (VOCAL)" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 4. Products derived from this software may not be called "VOCAL", nor
 *    may "VOCAL" appear in their name, without prior written
 *    permission of Vovida Networks, Inc.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
 * NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL VOVIDA
 * NETWORKS, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT DAMAGES
 * IN EXCESS OF $1,000, NOR FOR ANY INDIRECT, INCIDENTAL, SPECIAL,
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 * 
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by Vovida
 * Networks, Inc. and many individuals on behalf of Vovida Networks,
 * Inc.  For more information on Vovida Networks, Inc., please see
 * <http://www.vovida.org/>.
 *
 */

static const char* const SdpMedia_cxx_Version =
    "$Id: Sdp2Media.cxx,v 1.3 2002/03/15 01:56:03 sprajpat Exp $";


#include "global.h"
#include "Data.hxx"
#include "support.hxx"

#include "Sdp2Exceptions.hxx"
#include "Sdp2Media.hxx"


using Vocal::SDP::SdpMedia;
using Vocal::SDP::TransportType;
using Vocal::SDP::SdpMediaType;



const int SdpMedia::MaxFormatIntValue = 15;


///
SdpMedia::SdpMedia()
{
    mediaType = MediaTypeAudio;
    mediaTypeString = "audio";
    port = -1;
    numPorts = 0;
    transportType = TransportTypeRTP;
    formatList.clear();
    formatList.push_back( "0" );
    formatListInt.clear();
    formatListInt.push_back( 0 );
    mediaAttrib = 0;
    connection = 0;
    bandwidth = 0;
    encryptkey = 0;
    mediaInfo = "";
}    // SdpMedia::SdpMedia


///
SdpMedia::SdpMedia (list<Data>& mediaDetails)
{
    //initialize all pointers
    bandwidth = 0;
    mediaAttrib = 0;
    connection = 0;
    encryptkey = 0;
    list<Data>::iterator linecount;

    linecount = mediaDetails.begin();
    //print Media details
    list<Data>::iterator tempcount;
    tempcount = mediaDetails.begin();
    while (tempcount != mediaDetails.end())
    {
        cpLog(LOG_DEBUG_STACK, "SdpMedia: %s", (*tempcount).logData());
        tempcount++;
    }

    while (linecount != mediaDetails.end())
    {
        if ((*linecount)[0] == 'm')
        {
            Data lineStr = (*linecount);
	    lineStr.parse("=");

            list<Data> mList;
	    bool finished = false;
	    while(!finished) 
	    {
		Data x = lineStr.parse(" ", &finished);
		if(finished)
		{
		    x = lineStr;
		}
		mList.push_back(x);
	    }

            if (mList.size() < 4)
            {
                cpLog(LOG_ERR, "SdpMedia: m= size < 4");
                throw SdpExceptions(PARAM_NUMERR);
            }
            else
	    {
                cpLog(LOG_DEBUG_STACK, "SdpMedia: m= size >4");
	    }

            //parse media items.
            list<Data>::iterator mListIter;

            mListIter = mList.begin();

            mediaTypeString = *mListIter;
            if (mediaTypeString == Data("audio"))
            {
                mediaType = MediaTypeAudio;
                cpLog(LOG_DEBUG_STACK, "Found m=audio");
            }
            else if (mediaTypeString == Data("video"))
            {
                mediaType = MediaTypeVideo;
                cpLog(LOG_DEBUG_STACK, "Found m=video");
            }
            else
            {
                mediaType = MediaTypeUnknown;
                cpLog( LOG_DEBUG_STACK, "Found m=%s", mediaTypeString.logData() );
            }

            ++mListIter;
            /** port may be <port>/<num of ports>
                So, split mListIter again on /  */
            Data portDetails = (*mListIter);

            list<Data> portList;

	    finished = false;
	    while(!finished) 
	    {
		Data x = portDetails.parse("/", &finished);
		if(finished)
		{
		    x = portDetails;
		}
		portList.push_back(x);
	    }

	    if(portList.begin() != portList.end())
	    {
		LocalScopeAllocator lPort;
		port = strtol((*portList.begin()).getData(lPort), (char**)NULL, 10);
		cpLog(LOG_DEBUG_STACK, "SDP port: %d " , port);
	    }

            if (portList.size() == 2)
            {
                //contains the number of ports.
		LocalScopeAllocator lNumPorts;
                numPorts = atoi((++portList.begin())->getData(lNumPorts));
            }
            else
            {
                numPorts = 0;
            }

            ++mListIter;

            if (*mListIter == SdpMediaTransportRTPAVP)
            {
                transportType = TransportTypeRTP;
            }
            else if (*mListIter == SdpMediaTransportUDP)
            {
                transportType = TransportTypeUDP;
            }

            //handle the format list.
            formatList.clear();
            formatListInt.clear();
            char format[ MaxFormatIntValue+1 ];
            format[ MaxFormatIntValue ] = '\0';
            char* endPtr = 0;
            int formatInt = 0;
            ++mListIter;
            while (mListIter != mList.end())
            {
                //these are all format list items
                cpLog( LOG_DEBUG_STACK, "Media format: %s", (*mListIter).logData() );
                formatList.push_back( *mListIter );

		LocalScopeAllocator lItem;
                strncpy( format, (*mListIter).getData(lItem), MaxFormatIntValue );
                formatInt = strtol( format, &endPtr, 10 );
                if( endPtr == format )    // Format is not an integer
                {
                    cpLog( LOG_DEBUG, "Non-integer media format: %s", (*mListIter).logData() );
                }
                else                      // Format is an integer
                {
                    cpLog( LOG_DEBUG, "Integer media format: %d", formatInt );
                    formatListInt.push_back( formatInt );
                }
                ++mListIter;
            }

        }// if line = m.
        else if ((*linecount)[0] == 'a')
        {
            try
            {
                if (!mediaAttrib)
                {
                    //create the MediaAttribute object.
                    mediaAttrib = new MediaAttributes();
                    assert(mediaAttrib);
                }
                Data attrib = (*linecount);
		attrib.parse("=");
		
//                chomp (&attrib);
                mediaAttrib->setAttribute(attrib);
            }
            catch (SdpExceptions& )
            {
                throw SdpExceptions(FAILED);
            }
        }
        else if ((*linecount)[0] == 'b')
        {
            try
            {
                Data bw = (*linecount);
		bw.parse("=");

//                bw.erase(0, 2);
//                chomp (&bw);
                cpLog(LOG_DEBUG_STACK, "Bandwidth, before sending to C'tor:%s", bw.logData());
                bandwidth = new SdpBandwidth(bw);
                assert(bandwidth);
            }
            catch (SdpExceptions& )
            {
                throw SdpExceptions(FAILED);
            }
        }
        else if ((*linecount)[0] == 'k')
        {
            try
            {
                if (encryptkey)
                {
                    delete encryptkey;
                    encryptkey = 0;
                }

                Data key = (*linecount);

		key.parse("=");

//                key.erase(0, 2);
//                chomp (&key);
                cpLog(LOG_DEBUG, "Encryption key, before sending to C'tor:%s", key.logData());
                encryptkey = new SdpEncryptkey(key);
                assert(encryptkey);
            }
            catch (SdpExceptions& )
            {
                throw SdpExceptions(FAILED);
            }
        }
        else if ((*linecount)[0] == 'c')
        {
            try
            {
                Data conn = (*linecount);
		conn.parse("=");
//                conn.erase(0, 2);
//                chomp (&conn);

                connection = new SdpConnection(conn);
                assert(connection);
            }