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Smart Speed like Overcast. Smart Speed means shorten the silence of audio for saving time.
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do { | |
try audioPlayer = AVAudioPlayer(contentsOf: url) | |
audioPlayer.isMeteringEnabled = true | |
audioPlayer.enableRate = true | |
audioPlayer.prepareToPlay() | |
} catch let error as NSError { | |
print("audioPlayer error \(error.localizedDescription)") | |
} | |
audioPlayer.play() | |
// | |
timer = DispatchSource.makeTimerSource(queue: DispatchQueue(label: "com.domain.app.timer")) | |
timer.scheduleRepeating(deadline: .now(), interval: .milliseconds(100)) | |
timer.setEventHandler { [unowned self] in | |
self.audioPlayer.updateMeters() | |
let peakPower = self.audioPlayer.peakPower(forChannel: 0) | |
var newRate: Float = 1.0 | |
//increase rate if peak power is low | |
let silentPower: Float = -9 | |
if peakPower < silentPower { | |
let k: Float = 0.06 | |
newRate = 1 + min((silentPower - peakPower)*k, 1) //speed up (1 ... 2] | |
} | |
self.audioPlayer.rate = newRate | |
} | |
timer.resume() |
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