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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=149125416-03112009>1. not
really, but you can use it for that purpose (like I did)</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=149125416-03112009>2. I
am adding few template for function of <SPAN
class=149125416-03112009>MyVideoRTPSink which is derived from H264videoRTPSink
but with extension support</SPAN></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=149125416-03112009><SPAN
class=149125416-03112009>3. make sure that your extension header is according to
the standard </SPAN></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=149125416-03112009><SPAN
class=149125416-03112009>4. make sure that you are working with new VLC version
(0.9 and up)</SPAN></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=149125416-03112009><SPAN
class=149125416-03112009></SPAN></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=149125416-03112009>MyVideoRTPSink::specialHeaderSize()
{</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=149125416-03112009> //return the extension header
size</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=149125416-03112009>}</SPAN></FONT></DIV>
<DIV><SPAN class=149125416-03112009><FONT face=Arial color=#0000ff
size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2>Boolean <SPAN
class=149125416-03112009>MyVideoRTPSink</SPAN>::continuePlaying() {<BR> //
First, check whether we have a 'fragmenter' class set up yet.<BR> // If
not, create it now:<BR> if (fOurFragmenter == NULL)
{<BR> fOurFragmenter = new H264FUAFragmenter(envir(), fSource,
OutPacketBuffer::maxSize,<BR> ourMaxPacketSize() - 12/*RTP hdr
size*/ - <SPAN class=149125416-03112009>MY_MAX_EXTENSION_SIZE</SPAN>/*<SPAN
class=149125416-03112009>youre header extension
size</SPAN>*/);<BR> fSource = fOurFragmenter;<BR> }</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2> // Then call the parent class's
implementation:<BR> return
MultiFramedRTPSink::continuePlaying();<BR>}</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2>/**<BR> * do two
things<BR> * 1. exactly what H264videoRTPSink<BR> * 2.
adding <SPAN class=149125416-03112009>extension </SPAN><BR> */<BR>void
<SPAN
class=149125416-03112009>MyVideoRTPSink</SPAN>::doSpecialFrameHandling(unsigned
fragmentationOffset, unsigned char* frameStart, unsigned numBytesInFrame, struct
timeval frameTimestamp, unsigned numRemainingBytes){</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2> // Set the RTP 'M' (marker) bit
iff<BR> // 1/ The most recently delivered fragment was the end
of<BR> // (or the only fragment of) an NAL unit,
and<BR> // 2/ This NAL unit was the last NAL unit of an 'access unit' (i.e.
video frame).<BR> if (fOurFragmenter != NULL)
{<BR> H264VideoStreamFramer* framerSource<BR> =
(H264VideoStreamFramer*)(fOurFragmenter->inputSource());<BR> //
This relies on our fragmenter's source being a
"MPEG4VideoStreamFramer".<BR> if
(fOurFragmenter->lastFragmentCompletedNALUnit()<BR> &&
framerSource != NULL && framerSource->currentNALUnitEndsAccessUnit())
{<BR> setMarkerBit();<BR> }</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2> }</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff
size=2> setTimestamp(frameTimestamp);</FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2> //adding the
telemetry;<BR> if (fOurFragmenter != NULL)
{<BR> DveH264VideoStreamDiscreteFramer*
framerSource<BR> =
(DveH264VideoStreamDiscreteFramer*)(fOurFragmenter->inputSource());<BR> <BR> <BR> <BR> if
(<SPAN class=149125416-03112009>/* you want to ad the extension
now</SPAN>){</FONT></DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=149125416-03112009> </SPAN>unsigned char<SPAN
class=149125416-03112009>* </SPAN> <SPAN
class=149125416-03112009>ptrExt = /* pointer to your extension
structure*/</SPAN>;</FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=149125416-03112009> int size = /*size of your
extension structure*/</SPAN><BR><BR> setSpecialHeaderBytes<SPAN
class=149125416-03112009>(<SPAN class=149125416-03112009>ptrExt
</SPAN></SPAN>,size);<BR> setExtensionBit();<BR> }<BR> }<BR> </FONT></FONT></FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=149125416-03112009></SPAN></FONT> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> live-devel-bounces@ns.live555.com
[mailto:live-devel-bounces@ns.live555.com] <B>On Behalf Of </B>Tsahi
Etziony<BR><B>Sent:</B> Tuesday, November 03, 2009 5:20 PM<BR><B>To:</B>
live-devel@ns.live555.com<BR><B>Subject:</B> [Live-devel] how to send RTX header
extension?<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>I am using the <SPAN class=SpellE>wis</SPAN>-streamer to send
h.264 frames over <SPAN class=SpellE>rtp</SPAN>/<SPAN class=SpellE>rtsp</SPAN>,
and testing it by watching the stream with VLC player.<o:p></o:p></P>
<P class=MsoNormal>I wanted to add RTP header extension to the RTP packets, and
I have some problems.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I have <SPAN style="mso-spacerun: yes"> </SPAN><SPAN
class=SpellE>RTPSink</SPAN> class that inherits from the <SPAN
class=SpellE>MultiFramedRTPSink</SPAN> class, and I implemented the following
two virtual functions:<o:p></o:p></P>
<P class=MsoListParagraph style="TEXT-INDENT: -18pt; mso-list: l0 level1 lfo2"><![if !supportLists]><SPAN
style="mso-ascii-font-family: Calibri; mso-fareast-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri"><SPAN
style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN dir=ltr></SPAN><SPAN
class=SpellE>doSpecialFrameHandling</SPAN>() – it adds words to the special
header (which I understood it is the RTP header extension), and then calls the
original <SPAN class=SpellE>doSpecialFrameHandling</SPAN>()
function.<o:p></o:p></P>
<P class=MsoListParagraph style="TEXT-INDENT: -18pt; mso-list: l0 level1 lfo2"><![if !supportLists]><SPAN
style="mso-ascii-font-family: Calibri; mso-fareast-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri"><SPAN
style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN dir=ltr></SPAN><SPAN
class=SpellE>specialHeaderSize</SPAN>() – it returns the size of the special
header in 32bit words.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>the first problem I have is that I didn’t find any section of
the code that turns on the ‘header extension exists’ bit in the RTP header. I
added it manually in <SPAN class=SpellE>buildAndSendPacket</SPAN>()
function.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>The second problem I have is that now that the packets are
sent with the extension (according to a network sniffer), the VLC player
displays bad video. <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I have a few questions:<o:p></o:p></P><![if !supportLists]>
<P class=MsoListParagraph
style="TEXT-INDENT: -18pt; mso-list: l1 level1 lfo3"><SPAN
style="mso-bidi-font-family: Calibri"><SPAN style="mso-list: Ignore">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN dir=ltr></SPAN>is the special header
equivalent to the header extension?<SPAN class=149125416-03112009><FONT
color=#0000ff size=2> </FONT></SPAN></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -18pt; mso-list: l1 level1 lfo3"><SPAN
class=149125416-03112009> </SPAN><SPAN
class=149125416-03112009> </SPAN><o:p></o:p></P>
<P class=MsoListParagraph style="TEXT-INDENT: -18pt; mso-list: l1 level1 lfo3"><![if !supportLists]><SPAN
style="mso-bidi-font-family: Calibri"><SPAN style="mso-list: Ignore">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN dir=ltr></SPAN>Where is the ‘header
extension exists’ bit in the RTP header being turned on?<o:p></o:p></P>
<P class=MsoListParagraph style="TEXT-INDENT: -18pt; mso-list: l1 level1 lfo3"><![if !supportLists]><SPAN
style="mso-bidi-font-family: Calibri"><SPAN style="mso-list: Ignore">3.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN dir=ltr></SPAN>What did I forget? What am I
doing wrong?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Thanks<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<DIV><STRONG><FONT color=#000080 size=2></FONT></STRONG> </DIV>
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