Do I have to reset Audio Session Properties after interruption? - ios

Question

I am implementing a C listener to Audio Session Interruption. When it is called for interruption, I would deactivate my audio session. Then when my app resumes, I would activate the audio session again. I have set a number of properties and category for my audio session, do I have to reset everything after re-activation?
Thanks in advance.
Some code for reference:
Initialization, setting category:
OSStatus error = AudioSessionInitialize(NULL, NULL, interuptListenerCallBack, (__bridge void *)(self));
UInt32 category = kAudioSessionCategory_PlayAndRecord;
error = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(category), &category);
if (error) printf("couldn't set audio category!");
//use speaker as default
UInt32 doChangeDefaultOutput = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker, sizeof(doChangeDefaultOutput), &doChangeDefaultOutput);
//allow bluethoothInput
UInt32 allowBluetoothInput = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryEnableBluetoothInput, sizeof(allowBluetoothInput), &allowBluetoothInput);
The interuptListenerCallBack is where I deactivate and reactive the Audio Session because of the interruption, using
OSStatus error = AudioSessionSetActive(false);
if (error) printf("couldn't deactivate audio session!");
Or
OSStatus error = AudioSessionSetActive(true);
if (error) printf("AudioSessionSetActive (true) failed");

Answer 1

If you are correctly using the Audio session interruption listener, then no, you should not have to reset the properties. You just need to make sure that you actually call kAudioSessionBeginInterruption and kAudioSessionEndInterruption. I am not sure what your listener looks like, but if you are doing something like this:
if (inInterruptionState == kAudioSessionBeginInterruption) {
AudioSessionSetActive(NO);
}
if (inInterruptionState == kAudioSessionEndInterruption) {
AudioSessionSetActive(YES);
}
And are following the rules of Audio Session, Then theoretically, you should not have to reset your properties.
I don't know what you are using the Audio Session for, but you could also pause and resume playback by using the:
kAudioSessionInterruptionType_ShouldResume
and
kAudioSessionInterruptionType_ShouldNotResume.
You can use these as stated in the Docs:
kAudioSessionInterruptionType_ShouldResume
Indicates that the interruption that has just ended was one for
which it is appropriate to immediately resume playback; for example,
an incoming phone call was rejected by the user.
Available in iOS 4.0 and later.
Declared in AudioSession.h.
kAudioSessionInterruptionType_ShouldNotResume
Indicates that the interruption that has just ended was one for which it is not appropriate to resume playback; for example, your app
had been interrupted by iPod playback.
Available in iOS 4.0 and later.
Declared in AudioSession.h.
You should read the docs because there is a lot of info in there about pausing, resuming, and handling interruptions for the AudioSession.
NOTE:
AudioSession has been deprecated since iOS7. Use AVAudioSession methods instead, or set Pause and Resume option by setting the constant AVAudioSessionInterruptionOptions or AVAudioSessionInterruptionType.
(Available since iOS 6)