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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) 1996-2006 Live Networks, Inc. All rights reserved.
// Author Bernhard Feiten
// A filter that breaks up an H.263plus video stream into frames.
//
#include "H263plusVideoStreamFramer.hh"
#include "H263plusVideoStreamParser.hh"
#include <string.h>
#include <GroupsockHelper.hh>
///////////////////////////////////////////////////////////////////////////////
////////// H263plusVideoStreamFramer implementation //////////
//public///////////////////////////////////////////////////////////////////////
H263plusVideoStreamFramer* H263plusVideoStreamFramer::createNew(
UsageEnvironment& env,
FramedSource* inputSource)
{
// Need to add source type checking here??? #####
H263plusVideoStreamFramer* fr;
fr = new H263plusVideoStreamFramer(env, inputSource);
return fr;
}
///////////////////////////////////////////////////////////////////////////////
H263plusVideoStreamFramer::H263plusVideoStreamFramer(
UsageEnvironment& env,
FramedSource* inputSource,
Boolean createParser)
: FramedFilter(env, inputSource),
fFrameRate(0.0), // until we learn otherwise
fPictureEndMarker(False)
{
// Use the current wallclock time as the base 'presentation time':
gettimeofday(&fPresentationTimeBase, NULL);
fParser = createParser ? new H263plusVideoStreamParser(this, inputSource) : NULL;
}
///////////////////////////////////////////////////////////////////////////////
H263plusVideoStreamFramer::~H263plusVideoStreamFramer()
{
delete fParser;
}
///////////////////////////////////////////////////////////////////////////////
#ifdef DEBUG
static struct timeval firstPT;
#endif
///////////////////////////////////////////////////////////////////////////////
void H263plusVideoStreamFramer::doGetNextFrame()
{
fParser->registerReadInterest(fTo, fMaxSize);
continueReadProcessing();
}
///////////////////////////////////////////////////////////////////////////////
Boolean H263plusVideoStreamFramer::isH263plusVideoStreamFramer() const
{
return True;
}
///////////////////////////////////////////////////////////////////////////////
void H263plusVideoStreamFramer::continueReadProcessing(
void* clientData,
unsigned char* /*ptr*/, unsigned /*size*/,
struct timeval /*presentationTime*/)
{
H263plusVideoStreamFramer* framer = (H263plusVideoStreamFramer*)clientData;
framer->continueReadProcessing();
}
///////////////////////////////////////////////////////////////////////////////
void H263plusVideoStreamFramer::continueReadProcessing()
{
unsigned acquiredFrameSize;
u_int64_t frameDuration; // in ms
acquiredFrameSize = fParser->parse(frameDuration);
// Calculate some average bitrate information (to be adapted)
// avgBitrate = (totalBytes * 8 * H263_TIMESCALE) / totalDuration;
if (acquiredFrameSize > 0) {
// We were able to acquire a frame from the input.
// It has already been copied to the reader's space.
fFrameSize = acquiredFrameSize;
// fNumTruncatedBytes = fParser->numTruncatedBytes(); // not needed so far
fFrameRate = frameDuration == 0 ? 0.0 : 1000./(long)frameDuration;
// Compute "fPresentationTime"
if (acquiredFrameSize == 5) // first frame
fPresentationTime = fPresentationTimeBase;
else
fPresentationTime.tv_usec += (long) frameDuration*1000;
while (fPresentationTime.tv_usec >= 1000000) {
fPresentationTime.tv_usec -= 1000000;
++fPresentationTime.tv_sec;
}
// Compute "fDurationInMicroseconds"
fDurationInMicroseconds = (unsigned int) frameDuration*1000;;
// Call our own 'after getting' function. Because we're not a 'leaf'
// source, we can call this directly, without risking infinite recursion.
afterGetting(this);
} else {
// We were unable to parse a complete frame from the input, because:
// - we had to read more data from the source stream, or
// - the source stream has ended.
}
}
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