Hi , i have refered sample source code of Hello metronome App from app, i have customized the App according to my Requirements but i need help in fixing the Beat visuals, for example when playing at lowe bpm like less than 100 the beat visual appears first and then the sound comes frok the app (there is an delay between Beat visual and Sound from app). i need help to make the beat visual and sound to trigger at the same time, i have atatched my current code please do the needfull.
// schedule beats
func scheduleBeats() {
if (!isOn) { return }
while (beatsScheduled < beatsToScheduleAhead) {
// Schedule the beat.
let secondsPerBeat = 60.0 / Float32(tempoBPM)
let samplesPerBeat = Float(secondsPerBeat * Float(bufferSampleRate))
let beatSampleTime: AVAudioFramePosition = AVAudioFramePosition(nextBeatSampleTime)
let playerBeatTime: AVAudioTime = AVAudioTime(sampleTime: AVAudioFramePosition(beatSampleTime), atRate: bufferSampleRate)
// This time is relative to the player's start time.
// playing beat for showing in visual
let current_visual = self.bufferNumber
print("Self \(self.bufferNumber)")
player.scheduleBuffer(soundBuffer[self.bufferNumber]!, at: playerBeatTime, options: AVAudioPlayerNodeBufferOptions(rawValue: 0), completionHandler: {
self.syncQueue!.sync() {
self.beatsScheduled -= 1
// if last next beat is less than time signature increment beat
if(self.bufferNumber+1 < self.timeSignature)
{
self.bufferNumber += 1
}
else if(self.timeSignature == 1)
{
self.bufferNumber = 0
}
else
{
self.bufferNumber = 0
}
// once buffer is complete
self.scheduleBeats()
}
})
beatsScheduled += 1
if (!playerStarted) {
// start player if not played
player.play()
playerStarted = true
}
// animate beat in viewcontroller , pass current beat to the View controller.
let nodeBeatTime: AVAudioTime = player.nodeTime(forPlayerTime: playerBeatTime)!
let output: AVAudioIONode = engine.outputNode
let latencyHostTicks: UInt64 = AVAudioTime.hostTime(forSeconds: output.presentationLatency)
let dispatchTime = DispatchTime(uptimeNanoseconds: nodeBeatTime.hostTime + latencyHostTicks)
DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: dispatchTime) {
if (self.isOn) {
self.delegate?.works(self, beat: self.bufferNumber)
}
}
nextBeatSampleTime += Float64(samplesPerBeat)
}
}
