74 lines
2.9 KiB
C++
Executable File
74 lines
2.9 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 source, where every UDP payload is a complete frame
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// Implementation
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#include "BasicUDPSource.hh"
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#include <GroupsockHelper.hh>
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BasicUDPSource* BasicUDPSource::createNew(UsageEnvironment& env,
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Groupsock* inputGS) {
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return new BasicUDPSource(env, inputGS);
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}
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BasicUDPSource::BasicUDPSource(UsageEnvironment& env, Groupsock* inputGS)
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: FramedSource(env), fInputGS(inputGS), fHaveStartedReading(False) {
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// Try to use a large receive buffer (in the OS):
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increaseReceiveBufferTo(env, inputGS->socketNum(), 50*1024);
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// Make the socket non-blocking, even though it will be read from only asynchronously, when packets arrive.
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// The reason for this is that, in some OSs, reads on a blocking socket can (allegedly) sometimes block,
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// even if the socket was previously reported (e.g., by "select()") as having data available.
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// (This can supposedly happen if the UDP checksum fails, for example.)
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makeSocketNonBlocking(fInputGS->socketNum());
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}
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BasicUDPSource::~BasicUDPSource(){
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envir().taskScheduler().turnOffBackgroundReadHandling(fInputGS->socketNum());
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}
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void BasicUDPSource::doGetNextFrame() {
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if (!fHaveStartedReading) {
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// Await incoming packets:
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envir().taskScheduler().turnOnBackgroundReadHandling(fInputGS->socketNum(),
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(TaskScheduler::BackgroundHandlerProc*)&incomingPacketHandler, this);
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fHaveStartedReading = True;
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}
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}
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void BasicUDPSource::doStopGettingFrames() {
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envir().taskScheduler().turnOffBackgroundReadHandling(fInputGS->socketNum());
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fHaveStartedReading = False;
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}
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void BasicUDPSource::incomingPacketHandler(BasicUDPSource* source, int /*mask*/){
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source->incomingPacketHandler1();
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}
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void BasicUDPSource::incomingPacketHandler1() {
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if (!isCurrentlyAwaitingData()) return; // we're not ready for the data yet
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// Read the packet into our desired destination:
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struct sockaddr_in fromAddress;
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if (!fInputGS->handleRead(fTo, fMaxSize, fFrameSize, fromAddress)) return;
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// Tell our client that we have new data:
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afterGetting(this); // we're preceded by a net read; no infinite recursion
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}
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