Audio transport logic example

enum TransportState
{
    NONE,
    PREPARING,
    PREPARED,
    PLAYING,
    STOPPING,
    STOPPED
};

void AudioTransport::Update(const float fElapsedTime)
{
    switch(m_currentState)
    {
    case TransportState::NONE:
        if(bPrepareToPlayRequested)
            m_currentState = TransportState::PREPARING;
        break;
    case TransportState::PREPARING:
        if(!IsPreparedToPlay())
            PrepareToPlay();
        else
            m_currentState = TransportState::PREPARED;
        break;
    case TransportState::PREPARED:
        if(bPlayRequested)
        {
            Play();
            m_currentState = TransportState::PLAYING;
        }
        break;
    case TransportState::PLAYING:
        if(!IsPlaying() || bStopRequested)
            m_currentState = TransportState::STOPPING;
        break;
    case TransportState::STOPPING:
        UpdateFadeout(fElapsedTime);
        if(FadedOut())
        {
            Stop();
            m_currentState == TransportState::STOPPED;
        }
        break;
    case default:
        LogError(“Invalid AudioTransport state\n”);
        break;
    }
}