My iOS10 app does Text to Speech and Speech recognition. It pauses audio from other apps while this happens, and notifies the other when ASR/TTS is over so they can resume their audio. Everything works PERFECT on iPhone5 and 6.
The problem is with iPhone7s: the volume of spoken phrases is very low at first, and louder towards the end of phrases. Why?
I will provide some of my code just in case, because this seems like an iOS bug.
Audio session code:
-(AVAudioSessionCategoryOptions)indigoAudioBehaviorOptions:(AVAudioSession *)s{
AVAudioSessionCategoryOptions audioIOoptions = [s categoryOptions];
audioIOoptions |= AVAudioSessionCategoryOptionDefaultToSpeaker;
audioIOoptions |= AVAudioSessionCategoryOptionAllowBluetooth;
audioIOoptions |= AVAudioSessionCategoryOptionAllowBluetoothA2DP;
return audioIOoptions;
}
-(void)notifyIOSthatOtherAppsCanResumeAudioPlayback{
NSError *err;
[myAudioSession setActive: NO
withOptions: AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation
error: &err];
if(err!=nil){
NSLog(@"audioIsFreeNotificationForIOS ERROR: %@",err.description);
}
}
myAudioSession = [AVAudioSession sharedInstance];
NSError *err;
[myAudioSession setCategory:AVAudioSessionCategoryPlayAndRecord withOptions: [self indigoAudioBehaviorOptions:indigoAudioSession] error:&err];
Text to Speech code:
nativeVocalizer = [[AVSpeechSynthesizer alloc] init];
nativeVocalizer.delegate = self;
AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc] initWithString:stringToSpeak];
[utterance setVoice:[AVSpeechSynthesisVoice voiceWithLanguage:lang]];
[nativeVocalizer speakUtterance:utterance];
