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<concept xml:lang="en" id="GUID-F5D2C8DF-58B5-5620-824B-86BE72341DF7"><title>How to Create the Interface</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>The AMR payload formatter is implemented as an ECOM plug-in. An application user using the AMR payload formatter has to create an instance of the AMR payload formatter by providing the UID (<codeph>KAmrFormatterUid =

        0X2001AA65</codeph>). Any other formatter that is implemented as an ECOM plug-in and has the same interface as the AMR payload formatter can also be used by providing the UID of that particular implementation. </p> <p>The following code shows how to create the interface. </p> <codeblock id="GUID-7F86E9AB-1CB7-5E0A-99A6-0FBC86F01D1B" xml:space="preserve">// Create an instance of AMR Payload Formatter by passing KAmrFormatterUid

CStreamFormatter * aStreamFormatter =  CStreamFormatter::NewL(TUid::Uid(KAmrFormatterUid));

</codeblock> <p>After creating the interface the user calls the set or get stream properties. For more information see, <xref href="GUID-CCFFFE06-1FB8-56C8-874C-C4C1B936FAA4.dita">How to Set and Get the AMR Stream Property</xref>. </p> <p>The user calls the <xref href="GUID-2283C5F3-9237-38BE-933C-353ADF676B42.dita#GUID-2283C5F3-9237-38BE-933C-353ADF676B42/GUID-F885E957-C375-3CF9-82B7-2611B0974675"><apiname>CStreamFormatter::Pack()</apiname></xref> and <xref href="GUID-2283C5F3-9237-38BE-933C-353ADF676B42.dita#GUID-2283C5F3-9237-38BE-933C-353ADF676B42/GUID-B2F9AE75-87B9-3331-91DA-8FDA72E317F2"><apiname>CStreamFormatter::Unpack()</apiname></xref> function to pack or unpack the AMR encoded data. For more information see, <xref href="GUID-42665F58-7E04-5375-A039-7BBDE218DDE4.dita">How to Pack and Unpack the AMR Encoded Data</xref>. </p> <p>Then the user has to free the allocated memory as shown in the following code. </p> <codeblock id="GUID-CB51AE66-9A83-51DC-A62E-5EDC95CAAB7C" xml:space="preserve">delete aStreamFormatter;

// Close the ECOM session