determine whether audio is playing

gistfile1.txt

#!/usr/bin/env swift

import Foundation

func isAudioPlaying() -> Bool {
    let task = Process()
    task.launchPath = "/usr/bin/pmset"
    task.arguments = ["-g", "assertions"]

    let pipe = Pipe()
    task.standardOutput = pipe

    task.launch()
    task.waitUntilExit()

    let data = pipe.fileHandleForReading.readDataToEndOfFile()
    if let output = String(data: data, encoding: .utf8) {
        // Check for coreaudiod assertions that indicate audio is playing
        // These are created when audio is actively being output
        let audioIndicators = [
            "com.apple.audio.",
            "coreaudiod",
            "PreventUserIdleSystemSleep"
        ]

        // Look for coreaudiod preventing sleep (indicates audio is playing)
        // When audio plays, coreaudiod creates PreventUserIdleSystemSleep assertions
        let lines = output.components(separatedBy: "\n")
        for line in lines {
            if line.contains("coreaudiod") &&
               line.contains("PreventUserIdleSystemSleep") {
                // Audio is actively playing
                return true
            }
        }
    }

    return false
}

// Check if audio is playing
let isPlaying = isAudioPlaying()

// Print result
if isPlaying {
    print("YES - Audio is currently playing")
    exit(0)
} else {
    print("NO - No audio is playing")
    exit(1)
}