CODEWITHSUNDEEP
pythonpython-2.7pyalsaaudio
Daquaney
Daquaney

Reputation: 47

How would I add volume on to the current_volume list in pyalsaaudio?

I'm trying to add on volume to a current set volume, in this case we will say it's 80%. Using the alsaaudio module in Python, there is a function called getvolume

#declare alsaaudio
am = alsaaudio.Mixer()
#get current volume
current_volume = am.getvolume()

getvolume or current_volume in my case dumps a list such as [80L] for 80% volume. I am trying to add volume on to the current one like this, 

#adds 5 on to the current_volume    
increase = current_volume + 5
am.setvolume(increase)

But my problem is, since it's a list I cannot strip or replace characters and since I am relatively new to Python, have no clue on how to strip the characters in the list and then add 5 on to that integer after converting.

I created a run-able example here:

import alsaaudio
am = alsaaudio.Mixer()
current_volume = am.getvolume()
print(repr(current_volume), type(current_volume), type(current_volume[0]))

It prints: ('[45L]', <type 'list'>, <type 'long'>), even though this issue is solved, thanks for your responses.

Upvotes: 2

Views: 1150

Answers (2)

Mad Physicist
Mad Physicist

Reputation: 114548

According to the docs, Mixer.getvolume returns a list of integer percentages, with one element for each channel. The docs for Mixer.setvolume are less clear, but apear to imply that the first argument is an integer.

If my interpretation is correct, and you have only one channel, you can use list indexing to get the first element of the list as an integer. The other steps are as you show in the question. You may want to make sure that the incremented result is less than or equal to 100. The min function provides a standard idiom to do that:

import alsaaudio

am = alsaaudio.Mixer()
current_volume = am.getvolume()
new_volume = min(current_volume[0] + 5, 100)
am.setvolume(new_volume)

I've submitted issue #58 to pyalsaaudio to get the docs clarified a bit.

Upvotes: 0

Gang
Gang

Reputation: 2778

Mixer.getvolume([direction])

Returns a list with the current volume settings for each channel. The list elements are integer percentages.

https://www.programcreek.com/python/example/91452/alsaaudio.Mixer

    mixer = alsaaudio.Mixer()
    value = mixer.getvolume()[0]
    value = value + 5
    if value > 100:
        value = 100
    mixer.setvolume(value)

Upvotes: 1

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