Using AudioPlayer

[Sufo]

I'm writing an application where i want to use the AudioPlayer example from here http://wiki.forum.nokia.com/index.ph...ng_audio_files

I want to use AudioPlayer.cpp from another class, TestAudioContainer, so i need to create an instance of it in that class. The constructor for AudioPlayer is:

CAudioPlayer* CAudioPlayer::NewL(MExamplePlayStateObserver& aObserver)
{
CAudioPlayer* self = CAudioPlayer::NewLC(aObserver);
CleanupStack::Pop(self);
return self;
}

the MExamplePlayStateObserver class is defined in the AudioPlayer header:

class MExamplePlayStateObserver
{
public:
virtual void StateUpdate(CMdaAudioClipUtility::TState aState, TInt aPosition, TInt aDuration)=0;
};


So to create and instance of AudioPlayer in TestAudioContainer, i need to supply the AudioPlayer constructor with a MExamplePlayStateObserver parameter, and i'm not sure what to put. Just all NULL or what? Also, i realise i may be way off the mark here - i'm pretty unfamiliar with C++

cheers

[symbianyucca]

you do need to implment the MExamplePlayStateObserver. Thus derive the TestAudioContainer class from MExamplePlayStateObserver and implement the functions defined in the MExamplePlayStateObserver, and then use TestAudioContainer as MExamplePlayStateObserver.

[Sufo]

Hi, so i did what you said and had TestAudioContainer inherit MExamplePlayStateObserver. I implemented the MExamplePlayStateObserver function as follows:

void CTestAudioContainer::StateUpdate(CMdaAudioClipUtility::TState aState, TInt aPosition, TInt aDuration)
{

}

I left the body empty as 1) I figured just to play a file i might be able to leave it empty, and 2) i'm not sure what i'd put in it anyhow.

In TestAudioContainer, i implemented the following function:

void CTestAudioContainer::PlaySong()
{
iAudioPlayer = CAudioPlayer::NewL(*this);
_LIT(KMyAudioFile, "c:\\Data\\Sounds\\Digital\\hello.mp3");
iAudioPlayer->PlayL(KMyAudioFile);
}

Which i run from a handled event in TestAudioContainer:

TBool CTestAudioContainerView::HandlePlay_FileMenuItemSelectedL( TInt aCommand )
{
// TODO: implement selected event handler
iTestAudioContainer->PlaySong();
return ETrue;
}



Now i get the following build error:

Errors caused tool to abort.
make[1]: *** [\Symbian\9.2\S60_3rd_FP1\EPOC32\RELEASE\WINSCW\UDEB\TestAudio.exe] Error 1
make: *** [TARGETTESTAUDIO] Error 2
make -j 4 -s -C \Symbian\Carbide\workspace\TestAudio\group -f "ICONS_AIF_SCALABLE_DC.MK" TO_ROOT=..\..\..\..\.. EPOCBLD=..\..\..\..\..\Symbian\9.2\S60_3rd_FP1\EPOC32\BUILD\Symbian\Carbide\workspace\TestAudio\group\ICONS_AIF_SCALABLE_DC\WINSCW TO_BLDINF=..\..\..\..\..\Symbian\Carbide\workspace\TestAudio\group PLATFORM=WINSCW CFG=UDEB BLD
make -j 4 -s -r -f "\Symbian\9.2\S60_3rd_FP1\EPOC32\BUILD\Symbian\Carbide\workspace\TestAudio\group\TESTAUDIO\WINSCW\TESTAUDIO.WINSCW" UDEB
TestAudioContainer.cpp
..\src\TestAudioContainer.cpp:227: warning: variable / argument 'aState' is not used in function
..\src\TestAudioContainer.cpp:227: warning: variable / argument 'aPosition' is not used in function
..\src\TestAudioContainer.cpp:227: warning: variable / argument 'aDuration' is not used in function
mwldsym2.exe: Undefined symbol: 'class CMdaAudioRecorderUtility * CMdaAudioRecorderUtility::NewL(class MMdaObjectStateChangeObserver &, class CMdaServer *, int, enum TMdaPriorityPreference) (?NewL@CMdaAudioRecorderUtility@@SAPAV1@AAVMMdaObjectStateChangeObserver@@PAVCMdaServer@@HW4TMdaPriorityPreference@@@Z)'
mwldsym2.exe: referenced from 'void CAudioPlayer::PlayL(class TDesC16 const &) (?PlayL@CAudioPlayer@@QAEXABVTDesC16@@@Z)' in AudioPlayer.cpp:91

What do i need to do to create a working instance of CMdaAudioRecorderUtility?

cheers

[skumar_rao]

it shows linker error you might want to add mediaclientaudio.lib in your project,