> After creating my own class's
> · class myRTSPSinkOndemandMediaSubsession : public
> OnDemandServerMediaSubsession
> · class myFrameSource : public FramedSource
If your “myFrameSource” class delivers discrete H.264 NAL units (i.e., one at a
time), rather than an unstructured byte stream, then you MUST feed this into a
“H264VideoStreamDiscreteFramer”, NOT a “H264VideoStreamFramer”.
In particular, your “myRTSPSinkOndemandMediaSubsession” class’s implementation
of the "createNewStreamSource()” virtual function should look something like
this:
//////////
FramedSource* myRTSPSinkOndemandMediaSubsession::createNewStreamSource(unsigned
/*clientSessionId*/, unsigned& estBitrate) {
estBitrate = 500; // in kbps; set this to an appropriate estimate of your
stream’s bitrate
// Create the video source:
FramedSource* videoSource = myFrameSource::createNew(envir(), params);
// Create a framer for the video stream:
return H264VideoStreamDiscreteFramer::createNew(envir(), videoSource);
}
//////////
Note also that - because you’re feeding into a “H264VideoStreamDiscreteFramer”
- each H.264 NAL unit delivered by your “myFrameSource” object MUST NOT begin
with a ‘start code’ (0x00 0x00 0x00 0x01).
Also, if your encoder doesn’t automatically do so, then you should arrange for
the first two NAL units delivered by your “myFrameSource” object to be a SPS
and a PPS NAL unit. (Alternatively, in your implementation of the
“createNewRTPSink()” virtual function, you can use one of the forms of
“H264VideoRTPSink::createNew()” that takes SPS and PPS NAL unit information as
parameters.)
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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