[Live-devel] How to create a custom sink that streams to both the network and a local file

[Ross Finlayson]

> I have been playing with the FramedFilter class for a while, and created a simple filter that will just deliver its input to its output. However, it is not working for some reason. Can you point me to the point that I'm missing?
[...]
> void HistoryFilter::doGetNextFrame()
> {
> 	fFrameSize=0;
You don't need to do this here (although it does no harm), because you are (properly) setting "fFrameSize" later, in your 'after getting' function.

> void HistoryFilter::afterGettingFrame(void* clientData, unsigned  
> 	frameSize,	unsigned /*numTruncatedBytes*/,	struct timeval  
> 	presentationTime, unsigned /*durationInMicroseconds*/)
> {
> 	HistoryFilter* filter = (HistoryFilter*)clientData;
> 	filter->afterGettingFrame1(frameSize, presentationTime);
> }
> 
> void HistoryFilter::afterGettingFrame1(unsigned frameSize, struct timeval presentationTime)
> {
> 	fFrameSize = frameSize;
> 	fPresentationTime = presentationTime;
> 	afterGetting(this);
> }

Your filter also needs to be setting "fNumTruncatedBytes" and "fDurationInMicroseconds" (in your case, because you're making a direct copy, these will be the values of the "numTruncatedBytes" and "durationInMicroseconds" parameters, respectively).


> In my main server play() function, I put in this code:
> 
> FramedSource* videoES = fileSource;
> // Create a framer for the Video Elementary Stream:
> videoSource = MPEG4VideoStreamFramer::createNew(*env, videoES);
> historyFilter = HistoryFilter::createNew(*env, videoSource, "history.mp4");
> // Finally, start playing:
> *env << "Beginning to read from file...\n";
> videoSink->startPlaying(*historyFilter, afterPlaying, videoSink);

That looks fine - but don't forget to enter the event loop, by calling 
	env->taskScheduler().doEventLoop();
at the end of this code, otherwise nothing will happen.  (In a LIVE555-based application, almost everything gets done within the event loop).


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/

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