Types.Musicval t : t Ctypes.structure F.typval stream : (AudioStream.t Ctypes.structure, t Ctypes.structure) F.fieldval frame_count : (Unsigned.uint, t Ctypes.structure) F.fieldval looping : (bool, t Ctypes.structure) F.fieldval ctx_type : (int, t Ctypes.structure) F.fieldval ctx_data : (unit Ctypes_static.ptr, t Ctypes.structure) F.field