Changes to allow Cinder to do multi-channel QT audio

Quicktime.cpp

 +void MovieBase::setAudioDevice(const std::string& audioDeviceName, float audioBalance)
 +{
 +  // create a QT Audio Context and set it on a Movie
 +  ::QTAudioContextRef audioContext;
 +  ::CFStringRef deviceId = ::CFStringCreateWithCString( kCFAllocatorDefault, audioDeviceName.c_str(), kCFStringEncodingUTF8 );
 +  OSStatus status = ::QTAudioContextCreateForAudioDevice(kCFAllocatorDefault, deviceId, NULL, &audioContext);
 +  if (status) 
 +    throw QuickTimePathInvalidExc();
 +  
 +  if (NULL != audioContext) 
 +    status = SetMovieAudioContext(getObj()->mMovie, audioContext);
 +
 +  status = SetMovieAudioBalance(getObj()->mMovie, audioBalance, 0);
 +}
 +

Quicktime.h

    //! Gets the audio playback volume ranging from [0 - 1.0]
    float    getVolume() const;
  
 +  //! Sets the audio device we should use for this movie's playback
 +  void    setAudioDevice(const std::string& audioDeviceName, float audioBalance = 0.0f);
 +
    //! Sets up Fourier analysis on the movie using \a numBands distinct bands in a single (mono) channel. This data is only available during playback.
    void    setupMonoFft( uint32_t numBands );