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在我的代碼中，我創建了兩個聲音，sound1和sound2。每個聲音包含許多樣本，可以同時播放相同的聲音。問題是，如果我爲每個AVAudioUnitTimePitch創建看起來多於6到8個AVAudioPlayerNodes，則音頻會完全混亂。當我將樣本數量增加太多時，我甚至無法播放單個聲音。我不確定我的代碼是否錯誤，或者AVAudioEngine的節點限制是什麼。AVAudioEngine可以創建的節點數是否有限制？
class AudioManager{
var audioEngine:AVAudioEngine!;
var mixer:AVAudioMixerNode!;
var sound1:Sound!;
var sound2:Sound!;
init(){
audioEngine = AVAudioEngine();
mixer = audioEngine.mainMixerNode; //automatically creates instance of mixer node, output node, and connects
do{
try audioEngine.start();
}catch let e as NSError{
print("Error Starting AudioEngine \(e)");
}
sound1 = Sound(aManager: self, path: "assets/sounds/waterRefill", ofType: "mp3", numOfSamples: 7);
sound2 = Sound(aManager: self, path: "assets/sounds/balloonCreate", ofType: "mp3", numOfSamples: 2);
}
func playSound(){
sound1.play(1.0, pitch: 1.0);
}
func playSound2(){
sound2.play(1.0, pitch: 1.0);
}
class Sound {
var audioManager:AudioManager!;
var audioFileBuffer:AVAudioPCMBuffer!;
var numSamples:Int = 1;
var audioIndex:Int = 0;
var sampleList:[Sample] = [Sample]();
init(aManager:AudioManager, path:String, ofType:String, numOfSamples:Int){
audioManager = aManager;
if(numOfSamples < 1){
numSamples = 1;
}else{
numSamples = numOfSamples;
}
audioFileBuffer = createAudioBuffer(path, ofType: ofType);
for (var i = 0; i < numSamples; i++){
sampleList.append(Sample(sound: self));
}
}
func createAudioBuffer(path:String, ofType:String)-> AVAudioPCMBuffer?{
let filePath: String = NSBundle.mainBundle().pathForResource(path, ofType: ofType)!
let fileURL: NSURL = NSURL(fileURLWithPath: filePath)
do{
let audioFile = try AVAudioFile(forReading: fileURL)
let audioFormat = audioFile.processingFormat
let audioFrameCount = UInt32(audioFile.length)
let audioFileBuffer = AVAudioPCMBuffer(PCMFormat: audioFormat, frameCapacity: audioFrameCount)
do{
try audioFile.readIntoBuffer(audioFileBuffer)
return audioFileBuffer;
}catch let e as NSError{
print("Error loading Audio Into Buffer: \(e)");
}
}catch let e as NSError{
print("Error loading Audio File: \(e)");
}
return nil;
}
private func runIndex(){
if(audioIndex < (numSamples-1)){
audioIndex++;
}else{
audioIndex = 0;
}
}
func play(volume:Float, pitch:Float){
var count:Int = 0;
while(count < numSamples){
if(numSamples > 1){
runIndex();
}
if (!sampleList[audioIndex].pitchPlayer.playing) {
sampleList[audioIndex].volume = volume;
sampleList[audioIndex].pitch = pitch;
sampleList[audioIndex].playSample();
break;
}
count++;
}
}
class Sample{
var parentSound:Sound!
var pitchPlayer:AVAudioPlayerNode!;
var timePitch:AVAudioUnitTimePitch!;
var volume:Float = 1.0
var pitch:Float = 1.0
init(sound:Sound){
parentSound = sound;
pitchPlayer = AVAudioPlayerNode();
timePitch = AVAudioUnitTimePitch();
parentSound.audioManager.audioEngine.attachNode(pitchPlayer);
parentSound.audioManager.audioEngine.attachNode(timePitch);
parentSound.audioManager.audioEngine.connect(pitchPlayer, to: timePitch, format: parentSound.audioFileBuffer.format);
parentSound.audioManager.audioEngine.connect(timePitch, to: parentSound.audioManager.mixer, format: parentSound.audioFileBuffer.format);
}
func playSample(){
pitchPlayer.volume = volume;
timePitch.pitch = pitch;
print("Sample Play");
pitchPlayer.play();
pitchPlayer.scheduleBuffer(parentSound.audioFileBuffer, atTime: nil, options:.Interrupts, completionHandler: {[unowned self]() in
print("Is Stopped: \(self.pitchPlayer.playing)");
self.pitchPlayer.stop();
print("Is Stopped: \(self.pitchPlayer.playing)");
});
}
}
}
}
我的使用AVAAudioEngine和AVAudioPlayerNodes播放文件的應用程序不是在某些設備上播放聲音（雖然在iPhone 6s Plus等新設備上工作正常）。當我減少引擎上的節點數量時，它可以在較舊的設備上運行。我正在研究如何調整我的代碼以允許它在這些較舊的設備上工作，因爲節點數似乎是問題所在。 – vikzilla