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/**********
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 2.1 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.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
**********/
// "liveMedia"
// Copyright (c) 1996-2005 Live Networks, Inc. All rights reserved.
// A simple UDP sink (i.e., without RTP or other headers added); one frame per packet
// Implementation
#include "BasicUDPSink.hh"
#include <GroupsockHelper.hh>
BasicUDPSink* BasicUDPSink::createNew(UsageEnvironment& env, Groupsock* gs,
unsigned maxPayloadSize) {
return new BasicUDPSink(env, gs, maxPayloadSize);
}
BasicUDPSink::BasicUDPSink(UsageEnvironment& env, Groupsock* gs,
unsigned maxPayloadSize)
: MediaSink(env),
fGS(gs), fMaxPayloadSize(maxPayloadSize) {
fOutputBuffer = new unsigned char[fMaxPayloadSize];
}
BasicUDPSink::~BasicUDPSink() {
delete[] fOutputBuffer;
}
Boolean BasicUDPSink::continuePlaying() {
// Record the fact that we're starting to play now:
gettimeofday(&fNextSendTime, NULL);
// Arrange to get and send the first payload.
// (This will also schedule any future sends.)
continuePlaying1();
return True;
}
void BasicUDPSink::continuePlaying1() {
if (fSource != NULL) {
fSource->getNextFrame(fOutputBuffer, fMaxPayloadSize,
afterGettingFrame, this,
onSourceClosure, this);
}
}
void BasicUDPSink::afterGettingFrame(void* clientData, unsigned frameSize,
unsigned numTruncatedBytes,
struct timeval /*presentationTime*/,
unsigned durationInMicroseconds) {
BasicUDPSink* sink = (BasicUDPSink*)clientData;
sink->afterGettingFrame1(frameSize, numTruncatedBytes, durationInMicroseconds);
}
void BasicUDPSink::afterGettingFrame1(unsigned frameSize, unsigned numTruncatedBytes,
unsigned durationInMicroseconds) {
if (numTruncatedBytes > 0) {
envir() << "BasicUDPSink::afterGettingFrame1(): The input frame data was too large for our spcified maximum payload size ("
<< fMaxPayloadSize << "). "
<< numTruncatedBytes << " bytes of trailing data was dropped!\n";
}
// Send the packet:
fGS->output(envir(), fGS->ttl(), fOutputBuffer, frameSize);
// Figure out the time at which the next packet should be sent, based
// on the duration of the payload that we just read:
fNextSendTime.tv_usec += durationInMicroseconds;
fNextSendTime.tv_sec += fNextSendTime.tv_usec/1000000;
fNextSendTime.tv_usec %= 1000000;
struct timeval timeNow;
gettimeofday(&timeNow, NULL);
int uSecondsToGo;
if (fNextSendTime.tv_sec < timeNow.tv_sec) {
uSecondsToGo = 0; // prevents integer underflow if too far behind
} else {
uSecondsToGo = (fNextSendTime.tv_sec - timeNow.tv_sec)*1000000
+ (fNextSendTime.tv_usec - timeNow.tv_usec);
}
// Delay this amount of time:
nextTask() = envir().taskScheduler().scheduleDelayedTask(uSecondsToGo,
(TaskFunc*)sendNext, this);
}
// The following is called after each delay between packet sends:
void BasicUDPSink::sendNext(void* firstArg) {
BasicUDPSink* sink = (BasicUDPSink*)firstArg;
sink->continuePlaying1();
}
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