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<concept id="GUID-8D8202BB-1070-5EE2-85C0-E37AABA67340" xml:lang="en"><title>MmfExCodec:
Multimedia Framework codec plug-in example</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<section><title>Description</title> <p> <filepath>MmfExCodec</filepath> demonstrates
how to implement a codec plug-in for the Multimedia Framework. A codec converts
media data in one encoding into another encoding. The example converts audio
data encoded with PCM8 into PCM16. </p> <p>The program is an ECom plug-in
that implements the codec interface <codeph>CMMFCodec</codeph> by the class <codeph>CMMFExPcm8Pcm16Codec</codeph>.
When a client or media format requires a PCM8 to PCM16 codec, the Multimedia
Framework will instantiate a <codeph>CMMFExPcm8Pcm16Codec</codeph> object,
and call its <codeph>ProcessL()</codeph> member function to convert data supplied
a source buffer. As converting PCM8 into PCM16 only requires expanding each
byte in the source buffer into two bytes in the destination buffer, <codeph>CMMFExPcm8Pcm16Codec::ProcessL()</codeph> is
not very complex. </p> </section>
<section id="GUID-98F50184-E319-592D-A350-785799248B3C"><title>Download</title> <p>Click
on the following link to download the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-03d20b19-4462-40f7-bb6a-d91aaeea30b0.zip" scope="external"> MmfExCodec.zip file</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-03d20b19-4462-40f7-bb6a-d91aaeea30b0.html" scope="peer">browse </xref> to view the example code. </p> </section>
<section><title>Class summary</title><p> <xref href="GUID-18F4082A-D301-3007-88DD-0E13AB81C74A.dita"><apiname>CMMFCodec </apiname></xref>  <xref href="GUID-AE26E6A4-C1AD-3B35-B5F7-CE0AB60169BB.dita"><apiname>CMMFDataBuffer </apiname></xref>  </p></section>
</conbody></concept>