AudioKit AKTimePitch does not work for the recoded file example.m4a

Question

I am building up a APP on iOS by AudioKit(version 4.5.3), and I find out the AKTimePitch class does not work for me, here is my code(objective-c xcode 10):

(IBAction)startButton:(id)sender {
    NSURL *url = [[NSBundle mainBundle] URLForResource:@"burncalory" withExtension:@"m4a"];
    AKAudioFile *file = [[AKAudioFile alloc] initForReading:url error:nil];
    AKAudioPlayer *player = [[AKAudioPlayer alloc] initWithFile:file looping:NO lazyBuffering:YES error:nil completionHandler:^{
        NSLog(@"Finished!");
    }];

    AKTimePitch *akTimePitch = [[AKTimePitch alloc] init:player rate:2.0 pitch:1600 overlap:8];
    AudioKit.output = akTimePitch;
    [akTimePitch start];
    [AudioKit startAndReturnError:nil];
    [player playFrom:0.0];
}

I check out the playground(4.5.3), and the sample of "Time Stretching and Pitch Shifting" works well.

Is there something wrong in my code to use AKTimePitch or something wrong with my audio file example.m4a? By the way, this audio file can be loaded and play well by AKAudioPlayer.

score 1 · Answer 1 · answered Nov 04 '18 at 08:45

After some testing I found that the parameter in the init method does not work, but after I add akTimePitch.pitch=1600 before [player playFrom:0.0], then the AKTimePitch effects works!! I don't know why the AKTimePitch *akTimePitch = [[AKTimePitch alloc] init:player rate:2.0 pitch:1600 overlap:8]; just does not work...

AudioKit AKTimePitch does not work for the recoded file example.m4a

1 Answers1