How to control the volume of raspberry pi with python 3?

Question

I have been looking up the web for any reference to control the volume of raspberry pi (b+) with python script . I come up with this thread previously asked but python-alsaaudio doesn't works with python 3 or say in the thonny python idle . So I need to know any correct way to change the volume of pi as per the user input .

Answer 1

Another way is to control volume through a command line tool. There is a tool for the Alsa command line called amixer:

amixer sset Master 50%

Now you can create a simple python script that runs the above command:

import subprocess


# a value between 0 and 100
volume = 50
command = ["amixer", "sset", "Master", "{}%".format(volume)]
subprocess.Popen(command)

You can change Master to other soundcards. You can get a list of controls:

$ amixer scontrols

Simple mixer control 'Master',0
Simple mixer control 'PCM',0
Simple mixer control 'Line',0
Simple mixer control 'CD',0
Simple mixer control 'Mic',0
Simple mixer control 'Mic Boost (+20dB)',0
Simple mixer control 'Video',0
Simple mixer control 'Phone',0
Simple mixer control 'IEC958',0
Simple mixer control 'Aux',0
Simple mixer control 'Capture',0
Simple mixer control 'Mix',0
Simple mixer control 'Mix Mono',0