How to use SoundRequestFeedback to tell if a sound is being played or not?

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I am trying to reference the .playing function in SoundRequestFeedback.h(link to file) to allow my system to finish speaking before executing the rest of the code but I can't seem to figure out how to properly do that.

In my header file I declared sound_play::SoundRequestFeedback_<ContainerAllocator> v and proceeded to try and do

ROS_INFO("%d", v.playing); // prints False<->0 
sound_play::SoundClient.say("This is a test message"); //Says "This is a test message"
while(v.playing){}
    //stays in a loop while the system is saying the message
ROS_INFO("%d", v.playing); // also prints False, but does so while the system is still saying the message.

so v.playing always returns 0 and I don't know why. Does anyone know why ?