101 lines
3.6 KiB
C++
Executable File
101 lines
3.6 KiB
C++
Executable File
/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2016 Live Networks, Inc. All rights reserved.
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// A simple UDP sink (i.e., without RTP or other headers added); one frame per packet
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// Implementation
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#include "BasicUDPSink.hh"
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#include <GroupsockHelper.hh>
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BasicUDPSink* BasicUDPSink::createNew(UsageEnvironment& env, Groupsock* gs,
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unsigned maxPayloadSize) {
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return new BasicUDPSink(env, gs, maxPayloadSize);
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}
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BasicUDPSink::BasicUDPSink(UsageEnvironment& env, Groupsock* gs,
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unsigned maxPayloadSize)
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: MediaSink(env),
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fGS(gs), fMaxPayloadSize(maxPayloadSize) {
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fOutputBuffer = new unsigned char[fMaxPayloadSize];
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}
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BasicUDPSink::~BasicUDPSink() {
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delete[] fOutputBuffer;
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}
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Boolean BasicUDPSink::continuePlaying() {
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// Record the fact that we're starting to play now:
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gettimeofday(&fNextSendTime, NULL);
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// Arrange to get and send the first payload.
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// (This will also schedule any future sends.)
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continuePlaying1();
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return True;
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}
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void BasicUDPSink::continuePlaying1() {
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if (fSource != NULL) {
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fSource->getNextFrame(fOutputBuffer, fMaxPayloadSize,
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afterGettingFrame, this,
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onSourceClosure, this);
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}
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}
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void BasicUDPSink::afterGettingFrame(void* clientData, unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval /*presentationTime*/,
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unsigned durationInMicroseconds) {
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BasicUDPSink* sink = (BasicUDPSink*)clientData;
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sink->afterGettingFrame1(frameSize, numTruncatedBytes, durationInMicroseconds);
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}
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void BasicUDPSink::afterGettingFrame1(unsigned frameSize, unsigned numTruncatedBytes,
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unsigned durationInMicroseconds) {
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if (numTruncatedBytes > 0) {
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envir() << "BasicUDPSink::afterGettingFrame1(): The input frame data was too large for our spcified maximum payload size ("
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<< fMaxPayloadSize << "). "
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<< numTruncatedBytes << " bytes of trailing data was dropped!\n";
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}
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// Send the packet:
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fGS->output(envir(), fOutputBuffer, frameSize);
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// Figure out the time at which the next packet should be sent, based
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// on the duration of the payload that we just read:
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fNextSendTime.tv_usec += durationInMicroseconds;
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fNextSendTime.tv_sec += fNextSendTime.tv_usec/1000000;
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fNextSendTime.tv_usec %= 1000000;
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struct timeval timeNow;
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gettimeofday(&timeNow, NULL);
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int secsDiff = fNextSendTime.tv_sec - timeNow.tv_sec;
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int64_t uSecondsToGo = secsDiff*1000000 + (fNextSendTime.tv_usec - timeNow.tv_usec);
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if (uSecondsToGo < 0 || secsDiff < 0) { // sanity check: Make sure that the time-to-delay is non-negative:
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uSecondsToGo = 0;
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}
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// Delay this amount of time:
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nextTask() = envir().taskScheduler().scheduleDelayedTask(uSecondsToGo,
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(TaskFunc*)sendNext, this);
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}
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// The following is called after each delay between packet sends:
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void BasicUDPSink::sendNext(void* firstArg) {
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BasicUDPSink* sink = (BasicUDPSink*)firstArg;
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sink->continuePlaying1();
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}
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