AVAudioEngine 在停止后连接 AVAudioUnitSampler 并再次启动崩溃

Question

help, AVAudioEngine attach and connect a AVAudioUnitSampler play is ok.but 在调用 AVAudioEngine 停止并再次启动后，播放时崩溃。我的代码如下：

    self.engine=[[AVAudioEngine alloc] init];
    self.sampler= [AVAudioUnitSampler new];
    NSError *error=nil;

    NSURL soundfontFileURL = [[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:@"test" ofType:@"sf2"]];

    [_sampler loadSoundBankInstrumentAtURL:soundfontFileURL program:0 bankMSB:0x79 bankLSB:0 error:&error];
    [self.engine attachNode:_sampler];
    [self.engine connect:_sampler to:[self.engine outputNode] format:nil];


    if([self.engine startAndReturnError:&error]){

            NSLog(@"start ok ");
    }else{

      NSLog(@"start err: %@",error);
    }

    //play at here is ok.
    //[_sampler startNote:60 withVelocity:100 onChannel:0];
    [self.engine stop];

    if([self.engine startAndReturnError:&error]){

            NSLog(@"start ok ");
    }else{

      NSLog(@"start err: %@",error);
    }

   //after stop and start again,play crash AudioStreamerImpl::sIOWorkerProcess (17)
   [_sampler startNote:60 withVelocity:100 onChannel:0];

崩溃信息： libEmbeddedSystemAUs.dylib`DLSSample::GetMoreFrames: AudioStreamerImpl::sIOWorkerProcess (17): EXC_BAD_ACCESS (代码=1, 地址=0x701c943f1a0)

Answer 1

几个月来我的应用程序一直存在这样的问题。经过一些测试后，当您在启动引擎和播放音符之间重新加载 SoundFont 时，似乎不会出现崩溃。

    engine.stop()
    do {
        try engine.start()
        reloadSoundFont() // remove this, and there will be the crash with GetMoreFrames()
    } catch {
        print("Could not start engine: " + error.localizedDescription)
    }

    self.sampler.startNote(60, withVelocity: 100, onChannel: 0)

    delay(1.0) {
        self.sampler.stopNote(60, onChannel: 0)
    }

AVAudioEngine 在停止后连接 AVAudioUnitSampler 并再次启动崩溃

AVAudioEngine connect AVAudioUnitSampler after stop and start again crash

objective-c++

ios