Question

I’m trying to replicate some of the functionality in Apple’s avTouch, but I can’t get AVAudioPlayer to play a track.

It logs Could not play (null). The (null) represents AVAudioplayer player.url. However, when I log player.url, it returns correctly. I have also tested the stream URL (it’s from soundcloud).

I have pretty much only made two changes from the sample code.

1. I’m using an audio stream URL, rather than a file.

2. I had to add __bridge in the following code (I don’t really know what it is for though)

   OSStatus result = AudioSessionInitialize(NULL, NULL, NULL, NULL);
     if (result)
   NSLog(@"Error initializing audio session! %@", result);
   
     [[AVAudioSession sharedInstance] setDelegate: self];
     NSError *setCategoryError = nil;
     [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: &setCategoryError];
     if (setCategoryError)
       NSLog(@"Error setting category! %@", setCategoryError);
   
       result = AudioSessionAddPropertyListener (kAudioSessionProperty_AudioRouteChange, RouteChangeListener, (__bridge void *)self);
      if (result) 
   NSLog(@"Could not add property listener! %@", result);
   
   void RouteChangeListener(   void *                  inClientData,
                    AudioSessionPropertyID inID,
                    UInt32                  inDataSize,
                    const void *            inData)
   {
   SongsViewController* This = (__bridge SongsViewController*)inClientData;
   
   if (inID == kAudioSessionProperty_AudioRouteChange) {
   
   CFDictionaryRef routeDict = (CFDictionaryRef)inData;
   NSNumber* reasonValue = (__bridge NSNumber*)CFDictionaryGetValue(routeDict, CFSTR(kAudioSession_AudioRouteChangeKey_Reason));
   
   int reason = [reasonValue intValue];
   
   if (reason == kAudioSessionRouteChangeReason_OldDeviceUnavailable) {
   
       [This pausePlaybackForPlayer:This.player];
     }
    }
   }
   

Edit: I think this is occurring b/c AVAudioPlayer is not meant for network streams. Can I simply change AVAudioPlayer to AVPLayer? I have a feeling it’s not that easy.

Answer 1

AVAudioPlayer is not meant for network streams. Apple docs:

Apple recommends that you use this class for audio playback unless you are playing audio captured from a network stream or require very low I/O latency.