int afWriteFrames(AFfilehandle file, int track, void *samples,
	AFframecount frameCount);

afWriteFrames writes the sample frames pointed to by samples to the
audio file represented by file.

file is a valid file handle.
track is always use AF_DEFAULT_TRACK for now.
samples is a pointer to the array of sample frames to be written to the file.
frameCount is the number of frames from samples to be written.

afWriteFrames can return these possible errors:
AF_BAD_WRITE
AF_BAD_LSEEK
AF_BAD_TRACKID
