Overcome locked screen + silent mode to play audio

Question

This video is a recording of an app which can

over-ride silent mode
over-ride locked screen
play alarm music/melody

Our team is working on a similar custom iphone alarm clock

I would be so grateful if someone could help. I have been trying to break this for two weeks.

our below method is not called when device is locked. that's why alarm sound is not playing

-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
    
    if ([GlobalData gSettings].vibration) {
        timer = [NSTimer scheduledTimerWithTimeInterval:(1.0) target:self selector:@selector(onTimer) userInfo:nil repeats:YES];
        isVibration = YES;
    } else {
        isVibration = NO;
    }
    
    self.uinfo = notification.userInfo;
    
    
    
    NSString *soundname = [uinfo objectForKey:@"sound"];
    NSURL *clip = [[NSBundle mainBundle] URLForResource:soundname withExtension:@"caf"];
    if (clip) {
        
        self.avPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:clip error:NULL];
        self.avPlayer.delegate = self;
        AudioSessionInitialize (NULL, NULL, NULL, NULL);
        AudioSessionSetActive(true);
        
        // Allow playback even if Ring/Silent switch is on mute
        UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
        AudioSessionSetProperty (kAudioSessionProperty_AudioCategory,
                                 sizeof(sessionCategory),&sessionCategory);
    }
    else
    {
        
        NSURL *clip = [[NSUserDefaults standardUserDefaults]URLForKey:[uinfo objectForKey:@"sound"]];
        self.avPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:clip error:NULL];
        self.avPlayer.delegate = self;
        AudioSessionInitialize (NULL, NULL, NULL, NULL);
        AudioSessionSetActive(true);
        
        // Allow playback even if Ring/Silent switch is on mute
        UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
        AudioSessionSetProperty (kAudioSessionProperty_AudioCategory,
                                 sizeof(sessionCategory),&sessionCategory);
    }
    

    [self.avPlayer play];

"I would be so grateful if someone could help." With what? What's your question? — Paul D. Waite, Mar 20 '13 at 11:49
have you checked: http://stackoverflow.com/a/14641433/843366 ? The `AVAudioSessionCategoryPlayback` override the silent mode for me, the other part of the answer should help you with lock screen — Michał Zygar, Mar 20 '13 at 12:10
we have implemented this but with iOS 6.1.3 the sound does not play. the volume control appears to increase but there the audio does not appear until the iphone is unlocked? — TurtleKurtze, Mar 20 '13 at 13:11
i would be willing to pay 50 dollar bounty if someone can help us find a solution. :) — TurtleKurtze, Mar 20 '13 at 13:16

score 1 · Answer 1 · answered Apr 05 '13 at 07:18

I dug into the LivingEarth app a little. It seems they are using MMDeepSleepPreventer based -component. And they use some sort of internal alarms system(music being played is NOT triggered by the local notification but probably by NSTimer).

However, I found it to not be reliable in newer iOS versions, so I tweaked it a little. When launched it keeps playing the silent audio file which makes possible for app to run the NSTimers even if user pressed the lock button.

You can find my fork here.

Overcome locked screen + silent mode to play audio

1 Answers1