Volume control, revisited [solved]

RASPIAUDIO
1

Hi,

I’m having problems controlling the volume and I don’t use raspspotify. I usualy send sounds from python but I just cannot get the volume to adjust.

from subprocess import call
call(["amixer", "-D", "pulse", "sset", "Master", "0%"])

doesn’t work nor does
call(["pactl", "--", "set-sink-volume", "0", "5%"])

Any help is appreciated.
rpi ZeroW with buster.
TIA

cat /etc/asound.conf
options snd_rpi_googlevoicehat_soundcard index=0

pcm.softvol {
type softvol
slave.pcm dmix
control{
name Master
card 0
}
}

pcm.micboost{
type softvol
slave.pcm dsnoop
control {
name Micro
card 0
}
min_dB -10.0
max_dB 50.0
resolution 256}

pcm.!default {
type asym
playback.pcm "plug:softvol"
capture.pcm "plug:micboost"
}

ctl.!default {
type hw
card 0
}
2

Welcome!
When you just type this amixer -D… command in the terminal does it changes the sound volume?

thx

3

Just checked and on a terminal the following works to must sound:

amixer -D pulse sset Master 0%

Could you confirm that it works too on your side? If yes then maybe look at the permission you have when running this in Python

4

Thank you.

Yes it does work. Checked it with alsamixer. However, cannot change the volume within Python running it with user’s (pi) credentials.

This’ my test code:

: ~cat stream.py
#!/usr/bin/env python3

import os
import subprocess as sub

sub.call(["amixer", "-D", "pulse", "sset", "Master", "0%"])

player = "mplayer"
stream = "http://icy-4.radioparadise.com/aac-32"
volume_option ="-volume"
volume = 50

command = f"{player} {stream} {volume}"
os.system(command)

Happy Holidays.

5

just tested your code and this is working here.
:santa:

6

:thinking: yes it works but at what volume level? This’ the issue, I cannot adjust the volume.

Here’s a simple test code which starts with volume at 100% then goes down to 0%. In my case, there’s no change. Don’t know if it’s a code, hemisphere or hardware issue.
Thx

test .wav file can be find here: http://test.ebolisa.net/img/g.wav

#!/usr/bin/env python3

import simpleaudio as sa
from time import sleep
import subprocess as sub
import warnings # to supress wav msg
warnings.simplefilter("ignore")

filename = 'g.wav'

def play():
  wave_obj = sa.WaveObject.from_wave_file(filename)
  play_obj = wave_obj.play()
  play_obj.wait_done()  # Wait until sound has finished playing
  sleep(1)

# set volume to 100%
sub.call(["amixer", "-D", "pulse", "sset", "Master", "100%"])
play()

# setvolume to 50%
sub.call(["amixer", "-D", "pulse", "sset", "Master", "50%"])
play()

# set volume to 0%
sub.call(["amixer", "-D", "pulse", "sset", "Master", "0%"])
play()
7

Ok, Looks like by switching player from mplayer to mpv, had a better luck.
Now I can control the volume from python using the following test code:

#!/usr/bin/env python3
import subprocess as sub

VOLUME = ""
filename = 'g.wav'

def play(vol, file):
  sub.call(["mpv", "--volume", vol, file])

# set volume to 100%
VOLUME = "100.0"
play(VOLUME, filename)

# setvolume to 50%
VOLUME = "50.0"
play(VOLUME, filename)

# setvolume to mute
VOLUME = "0.0"
play(VOLUME, filename)

However, mpv response is much slower than mplayer.
Any thoughts?

Txs.

8

I personnaly just use aplay as it is already included in raspbian

Closing the topic

thx