Method Update

Source/Engine/Audio/AudioSource.cpp:389–510

}

void AudioSource::Update()
{
    PROFILE_CPU();
    PROFILE_MEM(Audio);

    // Update the velocity
    const Vector3 pos = GetPosition();
    const float dt = Math::Max(Time::Update.UnscaledDeltaTime.GetTotalSeconds(), ZeroTolerance);
    const auto prevVelocity = _velocity;
    _velocity = (pos - _prevPos) / dt;
    _prevPos = pos;
    if (_velocity != prevVelocity && Is3D())
    {
        AudioBackend::Source::VelocityChanged(SourceID, _velocity);
    }

    // Reset starting to play value once time is greater than zero
    if (_startingToPlay && GetTime() > 0.0f)
    {
        _startingToPlay = false;
    }

    if (Math::NearEqual(GetTime(), _startTime) && _isActuallyPlayingSth && _startingToPlay)
        ClipStarted();

    if (!UseStreaming() && Math::NearEqual(GetTime(), 0.0f) && _isActuallyPlayingSth && !_startingToPlay)
    {
        int32 queuedBuffers;
        AudioBackend::Source::GetQueuedBuffersCount(SourceID, queuedBuffers);
        if (queuedBuffers)
        {
            if (GetIsLooping())
            {
                Stop();
                Play();
            }
            else
            {
                Stop();
            }
            ClipFinished();
        }
    }

    // Skip other update logic if it's not valid streamable source
    if (!UseStreaming() || SourceID == 0)
        return;
    auto clip = Clip.Get();
    clip->Locker.Lock();

    // Handle streaming buffers queue submit (ensure that clip has loaded the first chunk with audio data)
    if (_needToUpdateStreamingBuffers && clip->Buffers[_streamingFirstChunk] != 0)
    {
        // Get buffers in a queue count
        int32 numQueuedBuffers;
        AudioBackend::Source::GetQueuedBuffersCount(SourceID, numQueuedBuffers);

        // Queue missing buffers