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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.
// Framed Sources
// Implementation
#include "FramedSource.hh"
#include <stdlib.h>
////////// FramedSource //////////
FramedSource::FramedSource(UsageEnvironment& env)
: MediaSource(env),
fAfterGettingFunc(NULL), fAfterGettingClientData(NULL),
fOnCloseFunc(NULL), fOnCloseClientData(NULL),
fIsCurrentlyAwaitingData(False) {
fPresentationTime.tv_sec = fPresentationTime.tv_usec = 0; // initially
}
FramedSource::~FramedSource() {
}
Boolean FramedSource::isFramedSource() const {
return True;
}
Boolean FramedSource::lookupByName(UsageEnvironment& env, char const* sourceName,
FramedSource*& resultSource) {
resultSource = NULL; // unless we succeed
MediaSource* source;
if (!MediaSource::lookupByName(env, sourceName, source)) return False;
if (!source->isFramedSource()) {
env.setResultMsg(sourceName, " is not a framed source");
return False;
}
resultSource = (FramedSource*)source;
return True;
}
void FramedSource::getNextFrame(unsigned char* to, unsigned maxSize,
afterGettingFunc* afterGettingFunc,
void* afterGettingClientData,
onCloseFunc* onCloseFunc,
void* onCloseClientData) {
// Make sure we're not already being read:
if (fIsCurrentlyAwaitingData) {
envir() << "FramedSource[" << this << "]::getNextFrame(): attempting to read more than once at the same time!\n";
exit(1);
}
fTo = to;
fMaxSize = maxSize;
fNumTruncatedBytes = 0; // by default; could be changed by doGetNextFrame()
fDurationInMicroseconds = 0; // by default; could be changed by doGetNextFrame()
fAfterGettingFunc = afterGettingFunc;
fAfterGettingClientData = afterGettingClientData;
fOnCloseFunc = onCloseFunc;
fOnCloseClientData = onCloseClientData;
fIsCurrentlyAwaitingData = True;
doGetNextFrame();
}
// ##### The following is for backwards-compatibility; remove it eventually:
#ifdef BACKWARDS_COMPATIBLE_WITH_OLD_AFTER_GETTING_FUNC
static void bwCompatHackAfterGetting(void* clientData, unsigned frameSize,
unsigned /*numTruncatedBytes*/,
struct timeval presentationTime,
unsigned /*durationInMicroseconds*/) {
FramedSource* source = (FramedSource*)clientData;
FramedSource::bwCompatAfterGettingFunc* clientAfterGettingFunc
= source->fSavedBWCompatAfterGettingFunc;
void* afterGettingClientData = source->fSavedBWCompatAfterGettingClientData;
if (clientAfterGettingFunc != NULL) {
(*clientAfterGettingFunc)(afterGettingClientData, frameSize, presentationTime);
}
}
void FramedSource::getNextFrame(unsigned char* to, unsigned maxSize,
bwCompatAfterGettingFunc* afterGettingFunc,
void* afterGettingClientData,
onCloseFunc* onCloseFunc,
void* onCloseClientData) {
fSavedBWCompatAfterGettingFunc = afterGettingFunc;
fSavedBWCompatAfterGettingClientData = afterGettingClientData;
// Call the regular (new) "getNextFrame()":
getNextFrame(to, maxSize, bwCompatHackAfterGetting, this,
onCloseFunc, onCloseClientData);
}
#endif
// ##### End of code for backwards-compatibility.
void FramedSource::afterGetting(FramedSource* source) {
source->fIsCurrentlyAwaitingData = False;
// indicates that we can be read again
// Note that this needs to be done here, in case the "fAfterFunc"
// called below tries to read another frame (which it usually will)
if (source->fAfterGettingFunc != NULL) {
(*(source->fAfterGettingFunc))(source->fAfterGettingClientData,
source->fFrameSize, source->fNumTruncatedBytes,
source->fPresentationTime,
source->fDurationInMicroseconds);
}
}
void FramedSource::handleClosure(void* clientData) {
FramedSource* source = (FramedSource*)clientData;
source->fIsCurrentlyAwaitingData = False; // because we got a close instead
if (source->fOnCloseFunc != NULL) {
(*(source->fOnCloseFunc))(source->fOnCloseClientData);
}
}
void FramedSource::stopGettingFrames() {
fIsCurrentlyAwaitingData = False; // indicates that we can be read again
// Perform any specialized action now:
doStopGettingFrames();
}
void FramedSource::doStopGettingFrames() {
// Default implementation: Do nothing
// Subclasses may wish to specialize this so as to ensure that a
// subsequent reader can pick up where this one left off.
}
unsigned FramedSource::maxFrameSize() const {
// By default, this source has no maximum frame size.
return 0;
}
Boolean FramedSource::isPrioritizedRTPStreamSelector() const {
return False; // default implementation
}
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