@protocol GADAudioVideoManagerDelegate <NSObject>
Defines methods that are called by audioVideoManager in response to events during video playback.
Tells the delegate that the Google Mobile Ads SDK will start playing a video. This method isn’t called if another video rendered by Google Mobile Ads SDK is already playing.
Tells the delegate that the Google Mobile Ads SDK has paused/stopped all video playback.
Tells the delegate that at least one video rendered by the Google Mobile Ads SDK will play sound. Your app should stop playing sound when this method is called.
Tells the delegate that all the video rendered by the Google Mobile Ads SDK has stopped playing sound. Your app can now resume any music playback or produce any kind of sound. Note that this message doesn’t mean that all the video has stopped playing, just audio, so you shouldn’t deactivate AVAudioSession’s instance. Doing so can lead to unexpected video playback behavior. You may deactivate AVAudioSession only when all rendered video ads are paused or have finished playing, and ‘audioVideoDidPauseAllVideo:’ is called.