When setting the current playback time in BKE_sound_play_scene we didn't
account for the frame length. So the current frame/time would be wrong
when we asked the audio playback what time it was.
This would lead to playback being offset when using time remapping and
AV sync.
Reviewed By: Richard Antalik and Sybren A. Stüvel
Differential Revision: http://developer.blender.org/D7248