Notification Service Extension errors in iOS 12.1 with AVFoundation

Media Technologies Audio
adaiye OP
Created Nov ’18
Replies 14
Boosts 1
Views 8.5k
Participants 11

Our app use notification service extension to play custom audio. It works fine before iOS12.0(include 12.0).

But when i upgrade to 12.1, and found it can't play custom audio in background.


1. We found it report error when call [AVAudioSession setActive:true error:&err], the error info is

Error Domain=NSOSStatusErrorDomain Code=561015905 "(null)"

https://developer.apple.com/documentation/avfoundation/avaudiosession/errorcode/cannotstartplaying


I'm sure our main app has the background mode property for audio.


2. When we use AVAssetExportSession to export AVMutableComposition to output an new m4a file, it report error too.

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSLocalizedFailureReason=An unknown error occurred (-16980), NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x10550bba0 {Error Domain=NSOSStatusErrorDomain Code=-16980 "(null)"}}


3. If we use AVAudioPlayer to paly an mp3 file, it failed.



Can anyone help me?



Answered by DTS Engineer in 342429022

Most extensions are not allowed to activate an audio session, and so cannot play audio or use speech synthesis. This wasn't being enforced consistently prior to iOS 12.1, but now it is.


Some extensions (such as notification content extensions) present UI to the user, and those are allowed to activate an audio session.


Background modes in info.plist are not allowed for app extensions (and will get your app rejected by App Review)

Replies  14
Boosts  1
Views  8.5k
Participants  11
xavier2018 OP
Nov ’18

We have encountered this problem as same.

0
Yang Han OP
Nov ’18

I also encountered this

0
Yang Han OP
Nov ’18

I notice that apple add a background mode for extension, you need add a 'Required background mode ' into info.plist that use 'App plays audio or streams audio/video using AirPlay'.

0
momo_ran OP
Nov ’18

I have tried this and added this field, which was rejected directly when submitted. Is there any other way?

0
xavier2018 OP
Nov ’18

I have submitted a report of this bug. No response for now.

0
adaiye OP
Nov ’18

have any document or links?

0
Schn OP
Nov ’18

Have you solved this problem?

0
Schn OP
Nov ’18

I have added the filed, but still can't play local mp3 file by AVFoundation. Have you solved this problem?

0
liuxinforios OP
Nov ’18

Have you solved the problem?I had the same problem,added"App plays audio or streams audio/video using AirPlay"I can't play it.

0
LeiWangLaunch OP
Nov ’18

Any one solved it ?

0
RRRRed OP
Nov ’18

We've encountered this problem too.


BTW, where is then "background mode" for extension?

0
DTS Engineer OP
Apple
Dec ’18
Accepted Answer

Most extensions are not allowed to activate an audio session, and so cannot play audio or use speech synthesis. This wasn't being enforced consistently prior to iOS 12.1, but now it is.


Some extensions (such as notification content extensions) present UI to the user, and those are allowed to activate an audio session.


Background modes in info.plist are not allowed for app extensions (and will get your app rejected by App Review)

0
Honest_kw OP
Dec ’18

Have any link or document?

0
jsyh OP
Nov ’19

Can we use AVAssetReader to read file in Notification Service Extension when iOS version is 12.1 or later?

0
Notification Service Extension errors in iOS 12.1 with AVFoundation
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