Python Volume Raspberry Pi, 2 Button Control, alsaaudio library

Readme.md

https://raspberrypi.stackexchange.com/questions/39928/unable-to-set-default-input-and-output-audio-device-on-raspberry-jessie

/usr/share/alsa/alsa.conf

pcm.!default {
    type hw
    card 1
}

ctl.!default {
    type hw
    card 1
}

defaults.ctl.card 1
defaults.pcm.card 1

volume_control.py

#!/usr/bin/env python

import RPi.GPIO as GPIO
import time
import alsaaudio

#print alsaaudio.cards()
#print alsaaudio.mixers()

m = alsaaudio.Mixer('PCM')
# m = alsaaudio.Mixer('PCM', cardindex=1)
vol = m.getvolume()[0]
is_mute = m.getmute()[0]
print vol

GPIO.setmode(GPIO.BCM)

def toggle_mute():
    global is_mute
    m.setmute(1 - is_mute)
    is_mute = m.getmute()[0]
    if is_mute:
        print('Muted')
    else:
        print('Un-muted')

vol_up_pin = 14
vol_dn_pin = 4
GPIO.setup(vol_up_pin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(vol_dn_pin, GPIO.IN, pull_up_down=GPIO.PUD_UP)

while True:
    vu = not GPIO.input(vol_up_pin)
    vd = not GPIO.input(vol_dn_pin)
    if vu and not vd:
        if is_mute:
            toggle_mute()
        if vol < 100:
            vol += 5
            m.setvolume(vol)
            vol = m.getvolume()[0]
        print 'Volume up Pressed', vol
    elif vd and not vu:
        if is_mute:
            toggle_mute()
        if vol > 0:
            vol -= 5
            m.setvolume(vol)
            vol = m.getvolume()[0]
        print 'Volume down Pressed', vol
    elif vd and vu:
        toggle_mute()
        time.sleep(0.5)

    time.sleep(0.2)