Hi Terry,
> > > I want to run the MP3 Player inside the same program if possible.
>
> To make it easier to get the interaction between the bells and the
> music. For example, when we run the wedding sequence, we will first
> ring changes in the tower, then play the Wedding March followed by
> Widor's Toccata and Fugue in the chancel, then changes in the tower.
>
> I'm sure it can be done with two separate programs, and maybe it would
> be better that way, but the two programs would need to communicate.
> Also, we will want to do a sequence of change rings in the tower on
> other occasions that still work even the chimes are still running.
OK, I don't get the detail, but here's the current on-the-quarter code.
while quarter_rings > 0:
os.system('mpg321 -g 100 -q ./mp3/Two_Chimes.mp3')
time.sleep(interval)
quarter_rings -= 1
time.sleep(march_delay)
os.system('mpg321 -g 20 -q ./mp3/Wedding_March.mp3')
time.sleep(changes_delay)
os.system('mpg321 -g 100 -q ./mp3/amersham.mp3')
os.system() is forking a new process, that creates a copy of your Python
program, has that child exec mpg321 thus overlaying /usr/bin/python with
/usr/bin/mpg321, and all the while the parent that did the fork waits
for the child to exit.
I think you're saying you want to kick off one tune and then, whilst
that's still playing, kick off another a little later? Append ` &' to
your mpg321 invocation so the /bin/sh running your os.system string puts
the program in the background and exits, allowing os.system to return.
More complicated needs can probably be satisfied with
https://docs.python.org/2/library/subprocess.html instead of os.system.
Cheers, Ralph.
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