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<concept id="GUID-59230503-7E2E-505D-9BC9-C2D2DB96B3E9" xml:lang="en"><title>RTPExample:

RTP Packet Streaming Example</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<section><title>Description</title> <p>This example code demonstrates RTP

packet streaming. It uses <codeph>CRtpFileSender</codeph> to send RTP packets

and <codeph>CRtpFileStreamer</codeph> to receive RTP packets. The example

opens an RTP session using the pre-connected socket and initialises new send

and receive sources on the RTP session. It registers the callback functions

when an RTP packet is successfully sent by a send source or received by a

receive source, to receive notifications whenever an RTP packet is sent or

received. </p> <p>The <filepath>RTPExample</filepath> example code provides

the following functionality: </p> </section>

<section id="GUID-1A5135CC-CAF2-58D8-B37D-5C04B0454D59"><title>Download</title> <p>Click

on the following link to download the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-a4ef24ea-0ffa-410a-a19c-e1085f64c0e2.zip" scope="external">RTPExample.zip</xref></p><p>Click <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-a4ef24ea-0ffa-410a-a19c-e1085f64c0e2.html" scope="peer">browse</xref> to view the example code. </p> </section>

<section><title>Initialising</title> <codeblock id="GUID-DD0E36D0-2CC4-52FF-8C58-2D0061A453CA" xml:space="preserve">void CRtpFileStreamer::ConstructL();</codeblock> <p>Opens an RTP session using the pre-connected socket and initialises new send

sources on the RTP session. </p> </section>

<section><title>Sending an RTP packet</title> <codeblock id="GUID-53DAAACD-46A9-5DAA-8B2D-A4108DA6DFA7" xml:space="preserve">void CRtpFileSender::RunL();</codeblock> <p>Sends the RTP packet. This does the following: </p> <ul>

<li id="GUID-C279418B-B804-53F1-B18F-1FB030BC6007"><p>gets a new RTP packet

to send from the send source </p> </li>

<li id="GUID-35269B55-BD88-5CEA-A9E1-5423BB0E3AF9"><p>sets the RTP timestamp

of the RTP packet </p> </li>

<li id="GUID-E38F83C8-5D08-51D2-9E6A-DA81FEBF6512"><p>reads a block of data

from the source file </p> </li>

<li id="GUID-42F2FE2D-D3B5-583E-B05C-CC693D3E14C9"><p>creates an RTP packet

using the block of data </p> </li>

<li id="GUID-B6ED7AF9-F395-589E-B511-3EBEAEF2E359"><p>sends the RTP packet </p> </li>

<li id="GUID-84488760-F28D-584A-A5F1-9E5D44C8C2D4"><p>closes the source file. </p> </li>

</ul> <p> <codeph>CRtpFileSender::PacketSent()</codeph> is called to notify

that the RTP packet has been successfully sent. </p> </section>

<section><title>Receiving an RTP packet</title> <codeblock id="GUID-0C30C58E-70B9-5E2A-946F-F349E8026454" xml:space="preserve">void CRtpFileStreamer::NewSource();</codeblock> <p>When an RTP packet with a new receive source arrives, this callback function

is called, which registers the packet. This can be used for different types

of RTP packets such as APP, BYE, SDES, SR and RR. </p> <codeblock id="GUID-22A41C41-613E-5DB5-BA35-1F92FEE214AF" xml:space="preserve">void CRtpFileStreamer::PacketArrived();</codeblock> <p>Whenever an RTP packet arrives, this callback function is called. The

function retrieves the payload from the packet received and writes it to the

target file. </p> </section>

<section><title>Class summary</title><p> <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>RSocket </apiname></xref>  <xref href="GUID-EF29C1D7-B1E5-370F-AE37-66231A6BE449.dita"><apiname>RSocketServ </apiname></xref>  <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection </apiname></xref> <xref href="GUID-97FC8566-E4AD-3881-8669-134798A88779.dita"><apiname> RRtpSession </apiname></xref>  <xref href="GUID-EF30A0A3-612A-362D-9AC5-07FD314E5CDC.dita"><apiname>RRtpSendSource </apiname></xref>  <xref href="GUID-3690BFA1-A4EA-34EA-AD63-5FCC14CB67A2.dita"><apiname>RRtpReceiveSource </apiname></xref>  <xref href="GUID-0720D1BD-7F73-3EF6-80A6-17127EF17C91.dita"><apiname>RRtpSendPacket </apiname></xref>  <xref href="GUID-3E4F47A8-0432-307A-B871-A2F7F3A7505F.dita"><apiname>RRtpReceivePacket </apiname></xref>  <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita"><apiname>RFs </apiname></xref> <xref href="GUID-BE0804F6-4375-3C8A-8C83-968F510466E0.dita"><apiname>RFile </apiname></xref>  </p></section>

<section><title>Usage</title> <p>The <xref href="GUID-3100800B-B2F7-50EF-BD4C-3C345ECCB2A5.dita">Symbian

OS build process</xref> describes how to build an application. </p> <p>This

is a console application, so does not have a GUI. It builds an executable

called <filepath>RTPExample.exe</filepath> in the standard location (<filepath>\epoc32\release\winscw\</filepath> <i>&lt;build_variant&gt;</i> for

CodeWarrior). After launching the executable, depending on the emulator you

are using, you may need to task away from the app launcher/shell screen to

view the console. </p> </section>

<section><title>See also</title> <p> <xref href="GUID-993629CB-17B4-5E87-8DE1-06A4AC473FDD.dita">RTP

overview</xref>  </p> </section>

</conbody></concept>