[Live-devel] doGetNextFrame()

[Julian Lamberty]

> Note that the error about "atempting to read more than once" occurs 
> if you call "getNextFrame()" on the *same* object a second time, 
> before the 'after getting' function from the first call has been 
> invoked.  I.e., it's OK to do:
>
> 	source->getNextFrame(..., afterGettingFunc, ...);
>
> 	void afterGettingFunc(...) {
> 		source->getNextFrame(...);
> 	}
>
> but you *cannot* do:
>
> 	source->getNextFrame(..., afterGettingFunc, ...);
> 	source->getNextFrame(...);
>   
Hmm, I can't get it working:

The structure is:

void Transcoder::doGetNextFrame()
{
    fInputSource->getNextFrame(inbuf, INBUF_SIZE, afterGettingFrame, 
this, handleClosure, this);
}

void Transcoder::afterGettingFrame(void* clientData, unsigned 
numBytesRead, unsigned numTruncatedBytes, struct timeval 
presentationTime, unsigned durationInMicroseconds)
{
    Transcoder* transcoder = (Transcoder*)clientData;
    transcoder->afterGettingFrame1(numBytesRead, numTruncatedBytes, 
presentationTime, durationInMicroseconds);
}

void Transcoder::afterGettingFrame1(unsigned numBytesRead, unsigned 
numTruncatedBytes, struct timeval  presentationTime, unsigned 
durationInMicroseconds)
{
    ...
    if(complete)
    {
       afterGetting(this);
    }
    else
    {
       fInputSource->getNextFrame(inbuf, INBUF_SIZE, afterGettingFrame, 
this, handleClosure, this);
    }
}

This results in the "attempting to read more than once" error. I need 
the afterGettingFrame1 function to get new data like in dogetNextFrame() 
until complete != 0. How can I do that, i.e. how does the call to 
getNextFrame() have to look?

Thanks for your support!

Julian
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