audio_controller.py

from pycaw.pycaw import AudioUtilities


class AudioController(object):
    """
    Use Py Core Audio Windows to grab all active processes
    and control the volume for the chosen one.
    """

    def __init__(self, process_name):
        self.process_name = process_name
        self.volume = self.process_volume()

    def mute(self):
        sessions = AudioUtilities.GetAllSessions()
        for session in sessions:
            interface = session.SimpleAudioVolume
            if session.Process and session.Process.name() == self.process_name:
                interface.SetMute(1, None)
                print(self.process_name, 'has been muted.')  # debug

    def unmute(self):
        sessions = AudioUtilities.GetAllSessions()
        for session in sessions:
            interface = session.SimpleAudioVolume
            if session.Process and session.Process.name() == self.process_name:
                interface.SetMute(0, None)
                print(self.process_name, 'has been unmuted.')  # debug

    def process_volume(self):
        sessions = AudioUtilities.GetAllSessions()
        for session in sessions:
            interface = session.SimpleAudioVolume
            if session.Process and session.Process.name() == self.process_name:
                print('Volume:', interface.GetMasterVolume())  # debug
                return interface.GetMasterVolume()

    def set_volume(self, decibels):
        sessions = AudioUtilities.GetAllSessions()
        for session in sessions:
            interface = session.SimpleAudioVolume
            if session.Process and session.Process.name() == self.process_name:
                # only set volume in the range 0.0 to 1.0
                self.volume = min(1.0, max(0.0, decibels))
                interface.SetMasterVolume(self.volume, None)
                print('Volume set to', self.volume)  # debug

    def decrease_volume(self, decibels):
        sessions = AudioUtilities.GetAllSessions()
        for session in sessions:
            interface = session.SimpleAudioVolume
            if session.Process and session.Process.name() == self.process_name:
                # 0.0 is the min value, reduce by decibels
                self.volume = max(0.0, self.volume-decibels)
                interface.SetMasterVolume(self.volume, None)
                print('Volume reduced to', self.volume)  # debug

    def increase_volume(self, decibels):
        sessions = AudioUtilities.GetAllSessions()
        for session in sessions:
            interface = session.SimpleAudioVolume
            if session.Process and session.Process.name() == self.process_name:
                # 1.0 is the max value, raise by decibels
                self.volume = min(1.0, self.volume+decibels)
                interface.SetMasterVolume(self.volume, None)
                print('Volume raised to', self.volume)  # debug