liveMedia/MPEG2TransportUDPServerMediaSubsession.cpp

/**********
This library 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 3 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)

This library 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 library; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
**********/
// "liveMedia"
// Copyright (c) 1996-2020 Live Networks, Inc.  All rights reserved.
// A 'ServerMediaSubsession' object that creates new, unicast, "RTPSink"s
// on demand, from an incoming UDP (or RTP/UDP) MPEG-2 Transport Stream
// Implementation

#include "MPEG2TransportUDPServerMediaSubsession.hh"
#include "BasicUDPSource.hh"
#include "SimpleRTPSource.hh"
#include "MPEG2TransportStreamFramer.hh"
#include "SimpleRTPSink.hh"
#include "GroupsockHelper.hh"


MPEG2TransportUDPServerMediaSubsession*
MPEG2TransportUDPServerMediaSubsession::createNew(UsageEnvironment& env,
						  char const* inputAddressStr, Port const& inputPort, Boolean inputStreamIsRawUDP) {
  return new MPEG2TransportUDPServerMediaSubsession(env, inputAddressStr, inputPort, inputStreamIsRawUDP);
}

MPEG2TransportUDPServerMediaSubsession
::MPEG2TransportUDPServerMediaSubsession(UsageEnvironment& env,
                                         char const* inputAddressStr, Port const& inputPort, Boolean inputStreamIsRawUDP)
  : OnDemandServerMediaSubsession(env, True/*reuseFirstSource*/),
    fInputPort(inputPort), fInputGroupsock(NULL), fInputStreamIsRawUDP(inputStreamIsRawUDP) {
  fInputAddressStr = strDup(inputAddressStr);
}

MPEG2TransportUDPServerMediaSubsession::
~MPEG2TransportUDPServerMediaSubsession() {
  delete fInputGroupsock;
  delete[] (char*)fInputAddressStr;
}

FramedSource* MPEG2TransportUDPServerMediaSubsession
::createNewStreamSource(unsigned/* clientSessionId*/, unsigned& estBitrate) {
  estBitrate = 5000; // kbps, estimate

  if (fInputGroupsock == NULL) {
    // Create a 'groupsock' object for receiving the input stream:
    struct in_addr inputAddress;
    inputAddress.s_addr = fInputAddressStr == NULL ? 0 : our_inet_addr(fInputAddressStr);
    fInputGroupsock = new Groupsock(envir(), inputAddress, fInputPort, 255);
  }

  FramedSource* transportStreamSource;
  if (fInputStreamIsRawUDP) {
    transportStreamSource = BasicUDPSource::createNew(envir(), fInputGroupsock);
  } else {
    transportStreamSource = SimpleRTPSource::createNew(envir(), fInputGroupsock, 33, 90000, "video/MP2T", 0, False /*no 'M' bit*/);
  }
  return MPEG2TransportStreamFramer::createNew(envir(), transportStreamSource);
}

RTPSink* MPEG2TransportUDPServerMediaSubsession
::createNewRTPSink(Groupsock* rtpGroupsock, unsigned char /*rtpPayloadTypeIfDynamic*/, FramedSource* /*inputSource*/) {
  return SimpleRTPSink::createNew(envir(), rtpGroupsock,
				  33, 90000, "video", "MP2T",
				  1, True, False /*no 'M' bit*/);
}