So I'm trying to play a sound file at a different rate in iOS 5.1.1, and am having absolutely no luck. So far I have tried setting the rate of the AVAudioPlayer:
player = [[AVAudioPlayer alloc] initWithContentsOfURL:referenceURL error:&error];
player.enableRate = YES;
player.rate = 1.5;
player.numberOfLoops = 0;
player.delegate = self;
[player prepareToPlay];
[player play];
with no luck at all, the sound plays but just ignores the rate I give it. I have also tried AVPlayer:
avPlayer = [[AVPlayer alloc] initWithURL:referenceURL];
avPlayer.rate = 0.5;
[avPlayer play];
Again, it plays but just ignores the rate I set. I have tried a number of different audio files but for the sake of this thread I selected Rooster-mono.wav from this catalogue: http://sig.sapp.org/sounds/wave/
Has anybody had any success with changing the playback rate on iOS 5.1.1? Or does anybody know what I am missing here?
I am doing this to change the pitch slightly of some of my samples, I realise I could do this by using RemoteIO or something similar but that seems total overkill for what I am trying to achieve (a simple playback rate adjustment).
Swift 2.0
This is how you do it.
rate value is between 0.1f - 2.0f
Modify the code to:
here is some code that i know works, just re-tested in an app i've been working on. as you mention, using
setEnableRate:
andsetRate:
will only work with iOS 5.0 and above. so i userespondsToSelector:
to test on the device whether or not the device will accept the request:running on an iOS 5 device, it performs the double-rate successfully. running on iOS 4.3, it plays it at normal speed.
so, the only way you'll get the proper rate is if your device has iOS 5 on it.