AudioQueueServices playback in background not working

Question

Using AudioQueueServices to play a streaming MP3 file, the player stops when the app is switched to the background.

I have:

• On the "Background Modes" panel of the "Capabilities" project settings page, I've turned on "Audio, AirPlay and Picture in Picture" and "Background fetch"

• On the "Info" page, under "Custom iOS Target Properties", added a "Required background modes" node with entries for "App plays audio or streams audio/video using AirPlay" and "App downloads content from the network"

• In the initialisation code for the player module, I include the following call:

  [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: &error];

  which completes without signalling an error.

According to my logs, as soon as the app switches to the background, I stop receiving any callbacks, so playback stops almost immediately afterwards. What do I need to do to get it to continue?

Answer 1

1. Checking AVAudioSession is active

2. Checking AudioQueueRef is running:

   UInt32 isRuning = NO;
   UInt32 size = sizeof(isRuning);
   AudioQueueGetProperty(inAQ, kAudioQueueProperty_IsRunning, &isRuning, &size);