[Live-devel] JPEG file over RTP

[Andy Bell]

Hi All,

I am wanting to stream a single JPEG file over RTP for test purposes, I load
the file and then create a video source to stream it to a client, in this
case VLC.  I am using the following code on each frame:

void TestJPEGVideoSource::doGetNextFrame()

{

fFrameSize = this->sosSize;

 if ( fFrameSize > fMaxSize )

{

printf( "Truncating frame!!\n" );

fNumTruncatedBytes = fFrameSize - fMaxSize;

fFrameSize = fMaxSize;

}

 memcpy( fTo, this->buffer + this->sosIndex, fFrameSize );

 if ( fPresentationTime.tv_sec == 0 && fPresentationTime.tv_usec == 0 )

{

gettimeofday( &fPresentationTime, NULL );

}

else

{

unsigned uSeconds = fPresentationTime.tv_usec + ( fTimePerFrame * 1000 );

fPresentationTime.tv_sec += uSeconds / 1000000;

fPresentationTime.tv_usec = uSeconds % 1000000;

}


 fDurationInMicroseconds = fTimePerFrame * 1000;

 nextTask() = envir().taskScheduler().scheduleDelayedTask( 0,
(TaskFunc*)FramedSource::afterGetting, this );

}

Where 'buffer' is the JPEG file, and sosIndex is the SOS marker index of the
file.  The problem is that when I come to decode the stream in VLC the image
is far blockier than the original.  Why is this?  What am I doing wrong?

Thanks in advance

Andy
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