Set the audio option (HDMI/headphones) in Python for pygame?

[java7nerd]

I'm trying to play a sound using pygame.

I found this solution online:

Code: Select all

import pygame
pygame.mixer.init()
sound = pygame.mixer.Sound("/usr/share/scratch/Media/Sounds/Animal/Meow.wav")
sound.play()

However, I hear nothing.

After messing around I found that if I run one of the Python Games that comes with Raspbian and select "Force HDMI", then my program plays sound correctly. When I exit the game, my program no longer works.

How do I set the audio option from Python? Or is there some other reason why my program is only working while I have another pygame game running? I'm assuming it's due to the audio option.

[DougieLawson]

Are you trying to get the sound on your HDMI TV or from the analog headphone socket?
Have you set the volume above zero (set to eleven)?

http://www.raspberrypi.org/forums/viewt ... 66&t=24943

[java7nerd]

Are you trying to get the sound on your HDMI TV or from the analog headphone socket?
Have you set the volume above zero (set to eleven)?

http://www.raspberrypi.org/forums/viewt ... 66&t=24943

I'm using HDMI. have not yet tried headphones.

Volume is fine, as other sounds play and it plays when I'm running another pygame.

I will check this topic you've linked and see if I find anything, thanks.

[DougieLawson]

Take a look at this one: http://www.raspberrypi.org/forums/viewt ... 32&t=31613
And http://blog.whaleygeek.co.uk/playing-so ... pberry-pi/

[AndrewS]

After messing around I found that if I run one of the Python Games that comes with Raspbian and select "Force HDMI", then my program plays sound correctly. When I exit the game, my program no longer works.

How do I set the audio option from Python? Or is there some other reason why my program is only working while I have another pygame game running? I'm assuming it's due to the audio option.

Best option would be to look at the source code of the program the does work correctly, work out how it's doing what it does, and then use that same code in your own program

And have a look also at http://www.raspberrypi.org/documentatio ... -config.md

[java7nerd]

Okay, I found out the problem. Audio doesn't work unless you input this shell command first if you want HDMI:

Code: Select all

amixer -c 0 cset numid=3 2

or if you want headphones:

Code: Select all

amixer -c 0 cset numid=3 1

The python games that come with the Pi runs a shell script first which prompts you to choose an option and then runs one of those commands before it starts running the game in Python.

[java7nerd]

Also, of note: after calling

Code: Select all

pygame.mixer.init()

It takes about one and a half seconds before the mixer is ready to start outputting sound. So if you play a sound immediately it gets eaten if the sound is short.

[AndrewS]

Okay, I found out the problem.

Well done. Onwards and upwards!