如何为AVAudioEngine设置完成处理程序
问题描述:
我正在使用此方法播放音频文件;如何为AVAudioEngine设置完成处理程序
- (空)playOnMainThread:(ID)参数
{
[self playAudio];
AVAudioEngine *engine = [[AVAudioEngine alloc] init];
AVAudioPlayerNode *node = [[AVAudioPlayerNode alloc] init];
[engine attachNode:node];
AVAudioUnitTimePitch *pitch = [[AVAudioUnitTimePitch alloc] init];
pitch.pitch = 100;
pitch.rate = 2;
[engine attachNode:pitch];
AVAudioMixerNode *mixerNode = engine.mainMixerNode;
[engine connect:node to:pitch format:[mixerNode outputFormatForBus:0]];
[engine connect:pitch to:mixerNode format:[mixerNode outputFormatForBus:0]];
AVAudioFile *audioFile = [[AVAudioFile alloc] initForReading:recorder.url error:&error];
if (error)
NSLog(@"AVAudioPlayer error %@, %@", error, [error userInfo]);
if (audioFile != nil) {
[node scheduleFile:audioFile atTime:nil completionHandler:nil];
[engine startAndReturnError:nil];
[node play];
}
}
但我需要设置一个completionhandler,这就是我曾尝试;
-(void)stopTalking:(AVAudioNodeCompletionHandler)handler
//-(void)stopTalking
{
isPlaying = NO;
[self unschedule:@selector(RepeatSpeackAction)];
[self schedule:@selector(StartGAmeCall)];
[stand setDisplayFrame:[[CCSpriteFrameCache sharedSpriteFrameCache] spriteFrameByName:@"Turn1.png"]];
if(video==true) {
cases=1;
[self addaudiotoDict];
}
}
我试图用这样的方式调用它;
[node scheduleFile:audioFile atTime:nil completionHandler:stopTalking];
没有成功,我该如何调用完成处理程序?
答
您需要使用GCD块,而不是一种方法,作为completionHandler
参数:
[node scheduleFile:audioFile atTime:nil completionHandler:^{
// Your "stopTalking" code goes here...
}];
答
没有上述答案为我工作,所以在这里我从寻找解决方案得到了
// audioFile here is our original audio
audioPlayerNode.scheduleFile(audioFile, at: nil, completionHandler: {
print("scheduleFile Complete")
var delayInSeconds: Double = 0
if let lastRenderTime = self.audioPlayerNode.lastRenderTime, let playerTime = self.audioPlayerNode.playerTime(forNodeTime: lastRenderTime) {
if let rate = rate {
delayInSeconds = Double(audioFile.length - playerTime.sampleTime)/Double(audioFile.processingFormat.sampleRate)/Double(rate!)
} else {
delayInSeconds = Double(audioFile.length - playerTime.sampleTime)/Double(audioFile.processingFormat.sampleRate)
}
}
// schedule a stop timer for when audio finishes playing
DispatchTime.executeAfter(seconds: delayInSeconds) {
audioEngine.mainMixerNode.removeTap(onBus: 0)
// Playback has completed
}
})
非常感谢你 - 完美的工作! – Hypergater