Per-app volume adjustments for PW/Pulse

appvol

#!/usr/bin/env python3

import json
import subprocess
import sys

if __name__ == "__main__":
    
    if len(sys.argv) < 3:
        print("Usage: %s <appname> <amount>" % sys.argv[0])
        raise SystemExit()

    appname = sys.argv[1]
    amount = sys.argv[2]

    json_str = subprocess.check_output(["pactl", "-fjson", "list", "sink-inputs"])
    data = json.loads(json_str)

    lastIndex = -1

    for node in data:
        if node.get("properties", {}).get("node.name", "") == appname:
            index = node.get("index", -1)
            if lastIndex < index:
                lastIndex = index

    lastIndex = str(lastIndex)

    subprocess.call(["pactl", "set-sink-input-volume", lastIndex, amount])