rtpTools.cxx
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上传日期:2013-07-25
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- /* ====================================================================
- * 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 vocal@vovida.org.
- *
- * 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 $1,000, NOR FOR ANY INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- *
- * ====================================================================
- *
- * This software consists of voluntary contributions made by Vovida
- * Networks, Inc. and many individuals on behalf of Vovida Networks,
- * Inc. For more information on Vovida Networks, Inc., please see
- * <http://www.vovida.org/>.
- *
- */
- static const char* const rtpTools_cxx_Version =
- "$Id: rtpTools.cxx,v 1.12 2001/03/21 01:02:22 kimle Exp $";
- #include <iostream>
- #include <stdio.h>
- #include <stdlib.h>
- #include "rtpTypes.h"
- #include "rtpTools.hxx"
- #include "cpLog.h"
- //#include "vsock.hxx"
- /* ----------------------------------------------------------------- */
- /* --- Number Functions -------------------------------------------- */
- /* ----------------------------------------------------------------- */
- /* 32-bit random number */
- u_int32_t generate32 ()
- {
- // should be seeded by main program
- return random();
- }
- /* random SRC number */
- RtpSrc generateSRC()
- {
- // doesn't check for collision
- RtpSrc src = 0;
- while (src == 0)
- src = generate32();
- return src;
- }
- /* prints raw bits of memory */
- void printBits (char* packetData, int len)
- {
- unsigned short int b;
- unsigned int c = 0;
- cerr << "n-----------------------------------n";
- for (int i = 0; i < len; i++)
- {
- if (i % 4 == 0 && i != 0)
- {
- printf (" %2.2X%2.2X%2.2X%2.2Xn",
- static_cast < unsigned char > (packetData[i - 4]),
- static_cast < unsigned char > (packetData[i - 3]),
- static_cast < unsigned char > (packetData[i - 2]),
- static_cast < unsigned char > (packetData[i - 1])
- );
- c = 0;
- }
- b = static_cast < unsigned short int > (
- static_cast < unsigned char > (packetData[i]));
- char out[9];
- for (int j = 0; j < 8; j++)
- {
- if (b % 2)
- out[7 - j] = '1';
- else
- out[7 - j] = '0';
- c = 2 * c + b % 2;
- b = b >> 1;
- }
- out[8] = ' ';
- cerr << out;
- cerr << " ";
- }
- }
- void printInt(int x)
- {
- char* packetData = reinterpret_cast < char* > (&x);
- for (int i = 0; i < 4; i++)
- {
- char out[9];
- unsigned short int b = static_cast < unsigned short int > (
- static_cast < unsigned char > (packetData[i]));
- for (int j = 0; j < 8; j++)
- {
- if (b % 2)
- out[7 - j] = '1';
- else
- out[7 - j] = '0';
- b = b >> 1;
- }
- out[8] = ' ';
- cerr << out;
- cerr << " ";
- }
- printf (" %2.2X%2.2X%2.2X%2.2Xn",
- static_cast < unsigned char > (packetData[0]),
- static_cast < unsigned char > (packetData[1]),
- static_cast < unsigned char > (packetData[2]),
- static_cast < unsigned char > (packetData[3])
- );
- return ;
- }
- bool RtpSeqGreater (RtpSeqNumber a, RtpSeqNumber b)
- {
- if ( (a > (RTP_SEQ_MOD - 20) && b < 20) || (a < 20 && b > RTP_SEQ_MOD - 20) )
- {
- //cpLog(LOG_DEBUG_STACK,"backwards compare %d > %d", a, b);
- return (a < b);
- }
- else
- return (a > b);
- }
- bool RtpTimeGreater( RtpTime a, RtpTime b )
- {
- if ( (a > (RTP_TIME_MOD - 1600) && b < 1600) || (a <1600 && b > RTP_TIME_MOD - 1600) )
- {
- //cpLog(LOG_DEBUG_STACK,"backwards compare %d > %d", a, b);
- return (a < b);
- }
- else
- return (a > b);
- }