Archived:Voice call recorder in Symbian C++

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17 Sep
2009

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Archived: This article is archived because it is not considered relevant for third-party developers creating commercial solutions today. If you think this article is still relevant, let us know by adding the template {{ReviewForRemovalFromArchive|user=~~~~|write your reason here}}.

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Code Example

Source file: Media:CallAudioRecord 31.zip

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Article

Created: mahbub_s60 (01 Apr 2009)

Last edited: hamishwillee (19 Jun 2012)

Introduction

This article describes how we can record a voice call automatically by 3rd party application. When ever we receive a phone call then there are state change in CTelephony class. If we monitor the state and when the state is changed is detected to CTelephony::EStatusConnected then we can start recording (for example). When the state is changed to CTelephony::EStatusDisconnecting then we can stop recording. Following code example shows how to do this.

// We get a notification from telephony subsytem.
void CHelloWorldBasicAppUi::CallStatusChangedL(CTelephony::TCallStatus& aStatus, TInt aError)
    {    
    if(aError != KErrNone) // Some thing wrong, we should handle though this example doesn't
        {
        return;
        }
    switch(aStatus)
        {
        case CTelephony::EStatusConnected:
            {
            //Recording start by HandleCommandL() method
            HandleCommandL(EProgCmdRecord);
            }
            break;
        case CTelephony::EStatusDisconnecting:
        case CTelephony::EStatusHold:            
            {
            //Recording stop by HandleCommandL() method
            HandleCommandL(EProgCmdStop);
            }
            break;            
         default:            
            break;                        
        }    
    }

Call status is updated to the previous class by the following code.

void CCallMonitor::RunL()
{   
    iCallBack.CallStatusChangedL(iCurrentStatus.iStatus, iStatus.Int());
    StartListening();    
}
 
void CCallMonitor::StartListening()
{
    Cancel();
    iCurrentStatus.iStatus = CTelephony::EStatusUnknown;    
    iTelephony->NotifyChange(iStatus,CTelephony::EVoiceLineStatusChange,iCurrentStatusPckg);
    SetActive();         
}

We need to create CMdaAudioRecorderUtility class with a priority and preferences as shown by the following code.

#define KAudioPriority 80
#define KAudioPreference 0x00060001
 
	iRecorderUtility = CMdaAudioRecorderUtility::NewL(
	        *this,
	        NULL,
	        KAudioPriority,
	        (TMdaPriorityPreference)KAudioPreference);

Example Applications

When we receive a call the call is automatically recorded to a file. That file can be played with a player. The application is tested with N95 8GB, complete source code can be found here: File:CallAudioRecord 31.zip