Get the real length of Programmer sound

Unreal Engine
,
#1

Hello everyone,

I have an issue with getting the real length of a programmers sound with FMOD in Unreal Engine.

The blueprint node “GetLength” and the “Sound->getLength()” always return 2000 ms even if the sound is longer than this.

so I searched in to the forum and I found this:

So I decided to do this:

in MyClass.cpp I wrote this:
void MyClass::PlayLineSound()
{

	if(FMODAudioComponent)
	{
		FMODAudioComponent->Stop();
		FMODAudioComponent->SetEvent(GetFMODEvent());
		FMODAudioComponent->SetProgrammerSoundName(GetProgrammerSoundName());
		FMODAudioComponent->StudioInstance->setCallback(&MyClass::MyCallback, FMOD_STUDIO_EVENT_CALLBACK_SOUND_PLAYED);
		FMODAudioComponent->Play();
	}
}

and then this is the callback:

FMOD_RESULT F_CALLBACK MyClass::MyCallback(FMOD_STUDIO_EVENT_CALLBACK_TYPE type, FMOD_STUDIO_EVENTINSTANCE* event, void* parameters)
{
	unsigned int length;

	FMOD::Sound* Sound = static_cast<FMOD::Sound*>(parameters);
	Sound->getLength(&length, FMOD_TIMEUNIT_MS);

	CurrentSoundDuration = static_cast<int32>(length);
	return FMOD_OK;
}

but when I print out my “CurrentSoundDuration” I always get 2000 ms, even if the sound is 5 seconds long.

Am I doing something wrong? Can you help me?

Thanks.

#2

It looks like you are casting the callbacks parameters directly to an FMOD::Sound where you should be casting it to FMOD_STUDIO_PROGRAMMER_SOUND_PROPERTIES.

There is a programmer sound example included in the API download (available from the download page), and you can also see an example in our UE4 Integration in function EventCallbackCreateProgrammerSound of the FMODAudioComponent.cpp.

#3

Hello again,

I gave a look at the FMODAudioComponent.cpp, so I modified my code like so:

void MyClass::PlayLineSound()
{
	if(FMODAudioComponent)
	{
		FMODAudioComponent->Stop();
		FMODAudioComponent->SetEvent(GetFMODEvent());
		FMODAudioComponent->SetProgrammerSoundName(GetProgrammerSoundName());
		FMODAudioComponent->StudioInstance->setCallback(&MyClass::MyCallback, FMOD_STUDIO_EVENT_CALLBACK_SOUND_PLAYED);
		FMODAudioComponent->Play();
	}
}

and then this is the callback (in the .cpp file):

FMOD_RESULT F_CALLBACK MyClass::MyCallback(FMOD_STUDIO_EVENT_CALLBACK_TYPE type, FMOD_STUDIO_EVENTINSTANCE* event, void* parameters)
{
	unsigned int length;

	GEngine->AddOnScreenDebugMessage(-1, 2, FColor::Blue, "Callback Called");
	
	FMOD_STUDIO_PROGRAMMER_SOUND_PROPERTIES* SoundProps = static_cast<FMOD_STUDIO_PROGRAMMER_SOUND_PROPERTIES*>(parameters);
	FString SoundName = SoundProps->name;
	FMOD::Studio::System *System = GetStudioModule().GetStudioSystem(EFMODSystemContext::Max);

	FMOD::Sound *Sound = nullptr;
	FMOD::System *LowLevelSystem = nullptr;
	System->getCoreSystem(&LowLevelSystem);
	FString SoundPath = SoundName;
	if (FPaths::IsRelative(SoundPath))
	{
		SoundPath = FPaths::ProjectContentDir() / SoundPath;
	}
	FMOD_MODE SoundMode = FMOD_LOOP_NORMAL | FMOD_CREATECOMPRESSEDSAMPLE | FMOD_NONBLOCKING;
	LowLevelSystem->createSound(TCHAR_TO_UTF8(*SoundPath), SoundMode, nullptr, &Sound);
	Sound->getLength(&length, FMOD_TIMEUNIT_MS);
	CurrentSoundDuration = static_cast<int32>(length);
	return FMOD_OK;
}

this is the declaration in the .h file

static FMOD_RESULT F_CALLBACK MyCallback(FMOD_STUDIO_EVENT_CALLBACK_TYPE type, FMOD_STUDIO_EVENTINSTANCE* event, void* parameters);

The problem I noticed now is that the callback never gets called.

What is happening?

Thanks

#4

The FMOD_STUDIO_EVENT_CALLBACK_SOUND_PLAYED callback does not get triggered until a sound is played in the event, but you are trying to create the sound in the callback. You will want to use another callback type, like FMOD_STUDIO_EVENT_CALLBACK_CREATE_PROGRAMMER_SOUND.