[opendev] The Background Music Box

mitu

@majikill said in [opendev] The Background Music Box:

That being said its kind of a shame this project didnt go far, i aim to change that. Is is possible to set a different volume level for mpg123 than master setting of ES.

You can, by defining a new ALSA device, with it's own volume - https://alsa.opensrc.org/How_to_use_softvol_to_control_the_master_volume.

Basically, you add in $HOME/.asoundrc

pcm.mp3 {
    type            softvol
    slave.pcm       "default"
    control.name    "Softmaster"
    control.card    0
}

then you instruct the audio application to use the mp3 ALSA device. When you open alsamixer to se the volume, you'll have 2 mixer elements, one of them called "Softmaster", and you can set the volume individually.

cyperghost

@mitu @majikill The method for volume change can be kept quite simpler. mpg123 -f switch scales volume level.

So please feel free to improve

32768 -- Volume 100%
29491  --Volume 90%
...
16284 -- Volume 50%
...
0 -- Mute

majikill

@cyperghost where would i apply these changes exactly? unless i make the changes to any instance mpg123 starts?

majikill

@mitu this would go just in the /home directory?

mitu

@majikill You can try modifying the script that starts the BGM music and add the -f parameter as @cyperghost mentioned. The .asoundrc configuration file I was mentioning should be added in $HOME (which translates to /home/pi).

majikill

@mitu awesome. perfect guys thank you. im gonna try both and see what works best for me.

majikill

@mitu i managed to create the .asoundrc file where it should be. but when i launch alsasound i only have a single mixer. i did put the file in /home/pi

mitu

@majikill Can you run

speaker-test -D mp3

and see if you get any errors ? Then start alsamixer and see if you have 2 mixer devices.

majikill

@mitu that worked! im curious why tho. once the test is run, does it force alsa to load the file i created?

majikill

@mitu ok well kinda worked. i see the softmaster in the mixer. but pcm still controls the volume for bgm

mitu

@majikill said in [opendev] The Background Music Box:

but pcm still controls the volume for bgm

You need to tell mpg321 to use the newly created device - as I said in my initial post:

mpg321 -o alsa --audiodevice mp3 <path/to/file>

majikill

@mitu ok, i think i get it now. im using this as a crash course in writing scripts, so im sorry if i dont understand how this should work. but this is a huge help, thank you.