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<TITLE>Re: How do I get the data from the lower levels..... Another DoGetNextFrame question (Ross Finlayson)</TITLE>
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<P><FONT SIZE=2 FACE="Arial">Hi Ross,</FONT>
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<P><FONT SIZE=2 FACE="Arial">Thanks for the response. I'm sorry that I didn't ask my question in a simpler manner. I hope this email helps. Please remember that I am a novice at Live555, so I cannot see from your deeply experienced eyes.</FONT></P>
<P><FONT SIZE=2 FACE="Arial">Assumption: Live555 has raw RTP video and audio packets coming in, and it re-assembles these into a framed video for output.</FONT></P>
<P><FONT SIZE=2 FACE="Arial"> </FONT>
<BR><FONT SIZE=2 FACE="Arial">Question: How do I get the data, from a higher level task, suck as PollTask (below) that is the re-assembled video payload. Video packets may be created from re-assembled RTP packets, or the video packets can be decomposed</FONT></P>
<P><FONT SIZE=2 FACE="Arial">From 1 RTP packet into many video packets.</FONT>
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<P><FONT SIZE=2 FACE="Arial">I need to get this video frame data.</FONT>
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<P><FONT SIZE=2 FACE="Courier New">Real Question: How do I get at the processed packets of (video frame) data, say from a MPEG4 or H.264 source, from a background PollTask?</FONT></P>
<P><FONT SIZE=2 FACE="Courier New">Do I use the solution that you gave? "The alternative is to write a static member function that then calls "doGetNextFrame()", and have "scheduleDelayedTask()" arrange to call the static member function. There are several examples of this in the code already." Or is that for the incoming, unprocessed RTP data?</FONT></P>
<P><FONT SIZE=2 FACE="Courier New">Or do I use something that calls afterGettingFrame from the sink? I think this is more likely.</FONT>
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<P><FONT SIZE=2 FACE="Courier New">I need to call the "thing" that gets me processed data from something like this:</FONT>
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<P><FONT SIZE=2 FACE="Courier New">//=====================================================================</FONT>
<BR><FONT SIZE=2 FACE="Courier New">// This polls the event loop every so often to check for events</FONT>
<BR><FONT SIZE=2 FACE="Courier New">//=====================================================================</FONT>
<BR><FONT SIZE=2 FACE="Courier New">void RtspClientPrivate::PollTask(void* pArgs) {</FONT>
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<P><FONT SIZE=2 FACE="Courier New"> //ACE_TRACE( ACE_TEXT("RtspClientPrivate::PollTask()") );</FONT>
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<P><FONT SIZE=2 FACE="Courier New"> RtspClientPrivate *pThis = reinterpret_cast<RtspClientPrivate *>(pArgs);</FONT>
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<P><FONT SIZE=2 FACE="Courier New"> if(NULL != pThis){</FONT>
<BR> <FONT SIZE=2 FACE="Courier New">// Call this again, after a brief delay:</FONT>
<BR> <FONT SIZE=2 FACE="Courier New">int uSecsToDelay = 100000; // 100 ms</FONT>
<BR> <FONT SIZE=2 FACE="Courier New">TaskFunc *pFunc = reinterpret_cast<TaskFunc*>(RtspClientPrivate::PollTask);</FONT>
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<BR> <FONT SIZE=2 FACE="Courier New">// HOW DO I GET THE DATA THAT I NEED HERE? (the upper layer)</FONT>
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<P> <FONT SIZE=2 FACE="Courier New">pThis->m_pEnv->taskScheduler().scheduleDelayedTask(uSecsToDelay, pFunc,</FONT>
<BR> <FONT SIZE=2 FACE="Courier New"> pArgs);</FONT>
<BR><FONT SIZE=2 FACE="Courier New"> }</FONT>
<BR><FONT SIZE=2 FACE="Courier New">}</FONT>
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<P><FONT SIZE=2 FACE="Courier New">Thanks, Rusty</FONT>
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