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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 id="GUID-50EDE46C-719B-4D77-8C61-666A5125C07C"><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 id="GUID-6CB87F84-BDBB-4606-917D-3FE79FDA16C5"><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 id="GUID-3F6D2D79-9639-4EAC-9EE6-BA32DC688B6F"><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 id="GUID-72251E64-B5EF-4994-8ECF-89872AE23D2F"><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 id="GUID-2291AD95-0A59-4FE0-A52E-12FA0876E097"><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 id="GUID-8FE5D0CA-57F6-4CF2-A5AA-44C6A7534AA3"><title>Usage</title> <p>The Symbian build process 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 id="GUID-467EE2A3-9D85-4909-9CB1-98C9CBCAA41D"><title>See

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