Routing a voice call between the earpiece and the loudspeaker on Symbian

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Article Metadata

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Code Example

Source file: Media:Ear Lound switch speakers.zip

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Tested with

Devices(s): Nokia E90 Communicator

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Compatibility

Platform(s): S60 3rd Edition

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Article

Keywords: KTelephonyAudioOutput, KTelephonyAudioOutputPreference

Created: User:Technical writer 1 (09 Oct 2008)

Last edited: hamishwillee (04 Jul 2012)

Note: :This API is not part of the public SDK. It can be found in the SDK API Plug-in.

Overview

The CR Keys To Control Phone Volume API included in the SDK API Plug-in package also includes keys for routing the voice call between the earpiece and the loudspeaker.

This snippet requires the following capabilities:

• ReadUserData
• WriteUserData
• ReadDeviceData
• WriteDeviceData

Because of the capability requirements, self-signing is not possible. A Developer Certificate is needed.

MMP file

The following capabilities and libraries are required:

CAPABILITY ReadUserData WriteUserData ReadDeviceData WriteDeviceData

LIBRARY centralrepository.lib

Source file

The required headers files are:

1. include <telephonyinternalcrkeys_partner.h> //from SDK API Plug-in
2. include <centralrepository.h> //CRepository

A simple way to switch the voice call routing between the earpiece and the loudspeaker is shown in the code snippet below. The routing mode is changed by reading the value of the Central Repository key and rewriting the opposite value.

 TInt mode(-1);
 TInt errNo =
   RProperty::Get(KTelephonyAudioOutput,
                  KTelephonyAudioOutputPreference,
                  mode);
 
 switch(mode)
   {
   case EPSPrivate: 	 
     RProperty::Set(KTelephonyAudioOutput,
                    KTelephonyAudioOutputPreference,
                    EPSPublic);
 	break;
 
   case EPSPublic:
     RProperty::Set(KTelephonyAudioOutput,
                    KTelephonyAudioOutputPreference,
                    EPSPrivate);
 	break;
   default:
 	break;
   }

Example application

File:Ear Lound switch speakers.zip