[英]AudioKit - Play sound files at specific position using sequencer
我想使用AudioKit框架生成一些高音和低音的小音序。
所以我开始的是这样的消息:“ 1100011010
”
- >每列应循环播放,如果值为"1"
AudioKit应播放(短) high frequency
声音,如果不是,则播放(短) lower frequency
声音。
因为一个简单的定时器循环触发每0.15 秒运行0.1s声音(高/低)的.play()
函数似乎不是很准确我决定使用*AudioKit Sequencer*
:
(o)audiokit:
enum Sequence: Int {
case snareDrum
}
var snareDrum = AKSynthSnare()
var sequencer = AKSequencer()
var pumper: AKCompressor?
var mixer = AKMixer()
public init() {
snareDrum >>> mixer
pumper = AKCompressor(mixer)
AudioKit.output = pumper
AudioKit.start()
}
func setupTracks() {
_ = sequencer.newTrack()
sequencer.tracks[Sequence.snareDrum.rawValue].setMIDIOutput(snareDrum.midiIn)
generateMessageSequence()
sequencer.enableLooping()
sequencer.setTempo(2000)
sequencer.play()
}
(o)play:var message =“1100011010”var counter = 0
for i in message {
counter+=0.15
if (i=="1") {
// play high sound at specific position
}
else {
// play low sound at specific position
}
}
(o)在特定位置播放低音:
sequencer.tracks[Sequence.snareDrum.rawValue].add(noteNumber: 20,
velocity: 10,
position: AKDuration(beats: counter),
duration: AKDuration(beats: 1))
我的问题 :如何使用(position: AKDuration(beats: counter)) //the code from above
而不是使用默认乐器(例如AKSynthSnare()
来播放特定位置的本地声音文件?
您可以创建两个轨道,每个轨道都有一个AKMIDISampler。 一个播放“低”样本,另一个播放“高”样本。 将高音符分配给高音轨,将低音符分配给低音轨。
let sequencer = AKSequencer()
let lowTrack = sequencer.newTrack()
let lowSampler = AKMIDISampler()
try! lowSampler.loadWav("myLowSoundFile")
lowTrack?.setMIDIOutput(lowSampler.midiIn)
let highTrack = sequencer.newTrack()
let highSampler = AKMIDISampler()
try! highSampler.loadWav("myHighSoundFile")
highTrack?.setMIDIOutput(highSampler.midiIn)
sequencer.setLength(AKDuration(beats: 4.0))
sequencer.enableLooping()
然后为每个音轨分配高低音
let message = "1100011010"
let dur = 4.0 / Double(message.count)
var position: Double = 0
for i in message {
position += dur
if (i == "1") {
highTrack?.add(noteNumber: 60, velocity: 100, position: AKDuration(beats: position), duration: AKDuration(beats: dur * (2/3)))
} else {
lowTrack?.add(noteNumber: 60, velocity: 100, position: AKDuration(beats: position), duration: AKDuration(beats: dur * (2/34)))
}
}
(我没有运行代码,但这样的东西应该工作)
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