Audio Session Initialization for iOS

[philipp.hofmann 4]

Hi,

 

I have to make the following settings for a test with a video chat software:
"What you can try, if you haven't already, would be to set the AVAudioSession to Mode AVAudioSession.Mode.videoChat and add the AVAudioSession.CategoryOption.mixWithOthers."

The reason is that currently as soon as I enter the video chat room, the music played in the app stops playing.
Now I've tried this with the following code:

 

procedure TicTrainerF.initIOSAudioSession();
var AudioSession: AVAudioSession;
    LErrorPtr: Pointer;
    LError: NSError;
    hasError: boolean;
begin
  mlog.info('initIOSAudioSession');
  hasError:=false;
  LErrorPtr := nil;
  AudioSession := TAVAudioSession.Wrap(TAVAudioSession.OCClass.sharedInstance);
  if (not hasError) then
  begin
    AudioSession.setMode(CocoaNSStringConst(libAVFoundation, 'AVAudioSessionModeVideoChat'),@LErrorPtr);
    if (LErrorPtr <> nil) then
    begin
      LError := TNSError.Wrap(LErrorPtr);
      mlog.info('initIOSAudioSession-Error (setMode): '+NSStrToStr(LError.localizedDescription));
      hasError:=true;
    end;
  end;
  if (not hasError) then
  begin
    AudioSession.setCategory(CocoaNSStringConst(libAVFoundation, 'AVAudioSessionCategoryOptionMixWithOthers'),@LErrorPtr);
    if (LErrorPtr <> nil) then
    begin
      LError := TNSError.Wrap(LErrorPtr);
      mlog.info('initIOSAudioSession-Error (setCategory): '+NSStrToStr(LError.localizedDescription));
      hasError:=true;
    end;
  end;
  if (not hasError) then
    mlog.info('initIOSAudioSession: finished successfully');
end;

 

 

But I get an OSStatus error -50 error back during the calls.
What else is wrong here?

Regards, Philipp

[Dave Nottage 494]

5 hours ago, philipp.hofmann said:

But I get an OSStatus error -50 error back during the calls.

What category are you setting the audio session to? According to the docs for AVAudioSessionCategoryOptionMixWithOthers, it needs to be one of: AVAudioSessionCategoryPlayAndRecord, AVAudioSessionCategoryPlayback, or AVAudioSessionCategoryMultiRoute:

 

https://developer.apple.com/documentation/avfaudio/avaudiosessioncategoryoptions/avaudiosessioncategoryoptionmixwithothers

 

You might also want to read the docs on AVAudioSessionModeVideoChat:

 

https://developer.apple.com/documentation/avfaudio/avaudiosessionmodevideochat

 

Also, what description is it giving for the error, and which calls, exactly? "the calls" is too vague.