/**
* Updates the source specific parameter like e.g. volume and pitch based on the associated
* wave instance.
*/
void FSLESSoundSource::Update( void )
{
SCOPE_CYCLE_COUNTER( STAT_AudioUpdateSources );
if( !WaveInstance || Paused )
{
return;
}
float Volume = WaveInstance->Volume * WaveInstance->VolumeMultiplier;
if( SetStereoBleed() )
{
// Emulate the bleed to rear speakers followed by stereo fold down
Volume *= 1.25f;
}
Volume *= GVolumeMultiplier;
Volume = FMath::Clamp(Volume, 0.0f, MAX_VOLUME);
const float Pitch = FMath::Clamp<float>(WaveInstance->Pitch, MIN_PITCH, MAX_PITCH);
// Set whether to apply reverb
SetReverbApplied(true);
// Set the HighFrequencyGain value
SetHighFrequencyGain();
FVector Location;
FVector Velocity;
// See file header for coordinate system explanation.
Location.X = WaveInstance->Location.X;
Location.Y = WaveInstance->Location.Z; // Z/Y swapped to match UE coordinate system
Location.Z = WaveInstance->Location.Y; // Z/Y swapped to match UE coordinate system
Velocity.X = WaveInstance->Velocity.X;
Velocity.Y = WaveInstance->Velocity.Z; // Z/Y swapped to match UE coordinate system
Velocity.Z = WaveInstance->Velocity.Y; // Z/Y swapped to match UE coordinate system
// We're using a relative coordinate system for un- spatialized sounds.
if( !WaveInstance->bUseSpatialization )
{
Location = FVector( 0.f, 0.f, 0.f );
}
// Set volume & Pitch
// also Location & Velocity
// Convert volume to millibels.
SLmillibel MaxMillibel = 0;
SLmillibel MinMillibel = -3000;
(*SL_VolumeInterface)->GetMaxVolumeLevel( SL_VolumeInterface, &MaxMillibel );
SLmillibel VolumeMillibel = (Volume * (MaxMillibel - MinMillibel)) + MinMillibel;
VolumeMillibel = FMath::Clamp(VolumeMillibel, MinMillibel, MaxMillibel);
SLresult result = (*SL_VolumeInterface)->SetVolumeLevel(SL_VolumeInterface, VolumeMillibel);
check(SL_RESULT_SUCCESS == result);
}
/**
* Initializes a source with a given wave instance and prepares it for playback.
*
* @param WaveInstance wave instance being primed for playback
* @return true if initialization was successful, false otherwise
*/
bool FCoreAudioSoundSource::Init( FWaveInstance* InWaveInstance )
{
if (InWaveInstance->OutputTarget != EAudioOutputTarget::Controller)
{
// Find matching buffer.
Buffer = FCoreAudioSoundBuffer::Init( AudioDevice, InWaveInstance->WaveData, InWaveInstance->StartTime > 0.f );
// Buffer failed to be created, or there was an error with the compressed data
if( Buffer && Buffer->NumChannels > 0 )
{
SCOPE_CYCLE_COUNTER( STAT_AudioSourceInitTime );
WaveInstance = InWaveInstance;
// Set whether to apply reverb
SetReverbApplied( true );
if (WaveInstance->StartTime > 0.f)
{
Buffer->Seek(WaveInstance->StartTime);
}
// Submit audio buffers
switch( Buffer->SoundFormat )
{
case SoundFormat_PCM:
case SoundFormat_PCMPreview:
SubmitPCMBuffers();
break;
case SoundFormat_PCMRT:
SubmitPCMRTBuffers();
break;
}
// Initialization succeeded.
return( true );
}
}
// Initialization failed.
return false;
}
