I've seen lots of questions about playing audio in the background. These questions often ask why the audio plays in the background of the simulator, yet the device simply wouldn't.
In my case, it's reversed.
When I tested my sample app in my iPad, it worked perfectly. However, when I began testing in the simulator, it simply wouldn't continue playing in the background.
Here are the codes I used:
NSURL *url = [NSURL URLWithString:firstSong];
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[audioPlayer setNumberOfLoops:-1];
[audioPlayer setCurrentTime:0];
[[AVAudioSession sharedInstance]setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance]setDelegate:self];
[[AVAudioSession sharedInstance] setActive:YES error:nil];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
[audioPlayer play];
Can anyone tell me why this won't work? Is it a bug or something?
Background audio is not supported in iOS Simulator afaik.
Related
I make an alarm feature for my app, at the time I setup for alarm fire I can play a music track with AVAudioPlayer, it worked well on background mode. But if at this time I opening Youtube app and playing a video then the AVAudioPlayer not work.
Please tell me why this happen and how to resolve this issue, how to play both at the same time
This is code I implement:
NSURL *soundURL = [[NSBundle mainBundle] URLForResource:#"remind2"
withExtension:#"mp3"];
avSound = [[AVAudioPlayer alloc]
initWithContentsOfURL:soundURL error:nil];
[avSound setDelegate:self];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[avSound prepareToPlay];
[avSound setNumberOfLoops:10];
[avSound setVolume:1.0];
[avSound play];
Thanks!
This is happened because of Youtube app also set property "UIBackgroundMode" property in plist. And even if you check any of other Music app like gaana, savan, etc. this will happened in all of the music app.
Replace this line
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
by this:
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:nil];
and I resolved my problem
It takes me two days to put the right questions to this problem, I only find the solution when i ask Google why Youtube stop my audio stream and this result search help me
AVAudioPlayer turns off iPod - how to work around?
I have an app mostly based around Core Bluetooth.
When something specific happens, the app is woken up using Core Bluetooth background modes and it fires off an alarm, however I can't get the alarm working when the app is not in the foreground.
I have an Alarm Singleton class which initialises AVAudioPlayer like this:
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
pathForResource:soundName
ofType:#"caf"]];
self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
[self.player prepareToPlay];
self.player.numberOfLoops = -1;
[self.player setVolume:1.0];
NSLog(#"%#", self.player);
This is the method that is called when my alarm code is called:
-(void)startAlert
{
NSLog(#"%s", __FUNCTION__);
playing = YES;
[self.player play];
NSLog(#"%i", self.player.playing);
if (vibrate) {
[self vibratePattern];
}
}
Now when the app is in the foreground, self.player.playing returns 1 however when the app is in the background self.player.playing returns 0. Why would this be?
All the code is being called, so the app is awake and functioning.
The vibrate works perfectly which uses AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
Any idea why this sound won't play?
Thanks
Apple has a nice Technical Q&A article about this in its documentation (see also Playing and Recording Background Audio).
I think one big thing missing is that you haven't activated the Audio Background Mode in the Xcode settings:
Maybe also adding [self.player prepareToPlay] in your alert method is helpful.
I have an App than also needs background audio but my App works with the App background mode "Voice over IP" as it needs to record sometimes. I play background audio telling the App singleton I need to play audio in background:
UIBackgroundTaskIdentifier newTaskId = UIBackgroundTaskInvalid;
if([thePlayer play]){
newTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:NULL];
}
EDIT: You must call [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:NULL]; before your app goes to background. In my app, it is at the same time you start playing, in yours, if the player might be started in background, you should do:
- (void)applicationDidEnterBackground:(UIApplication *)application{
// You should retain newTaskId to check for background tasks and finish them
newTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:NULL];
}
Apple docs
Either enable audio support from the Background modes section of the Capabilities tab
Or enable this support by including the UIBackgroundModes key with the audio value in your app’s Info.plist file
I take it you have the audio background mode specified for the app. Even so, I'm not sure you can set an audio session to be active while in the background. You need to have activated it before going into the background. You may also need to play some silent audio to keep this active, but this is seems like bad practice (it may drain the battery). Looking at the docs for notifications there seems to be a way to have a local notification play an audio sample that's included in your bundle, which seems to be what you want to do, so maybe that's the way to go.
Try this :
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:nil];
link
Try this http://www.sagorin.org/ios-playing-audio-in-background-audio/
You need to enable your app to handle audiosession interruptions (and ended interruptions) while in the background. Apps handle audio interruptions through notification center:
First, register your app with the notification center:
- (void) registerForMediaPlayerNotifications {
[notificationCenter addObserver : self
selector: #selector (handle_iPodLibraryChanged:)
name: MPMediaLibraryDidChangeNotification
object: musicPlayer];
[[MPMediaLibrary defaultMediaLibrary] beginGeneratingLibraryChangeNotifications];
}
Now save player state when interruption begins:
- (void) audioPlayerBeginInterruption: player {
NSLog (#"Interrupted. The system has paused audio playback.");
if (playing) {
playing = NO;
interruptedOnPlayback = YES;
}
}
And reactivate audio session and resume playback when interruption ends:
-(void) audioPlayerEndInterruption: player {
NSLog (#"Interruption ended. Resuming audio playback.");
[[AVAudioSession sharedInstance] setActive: YES error: nil];
if (interruptedOnPlayback) {
[appSoundPlayer prepareToPlay];
[appSoundPlayer play];
playing = YES;
interruptedOnPlayback = NO;
}
}
Here's Apple's sample code with full implementation of what you're trying to achieve:
https://developer.apple.com/library/ios/samplecode/AddMusic/Introduction/Intro.html#//apple_ref/doc/uid/DTS40008845
I was also facing the same problem, but i was only facing it only during initial time when i was trying to play a sound while app was in background, once the app comes in foreground and i play the sound once than it works in background also.
So as soon as app is launched/ login is successful in my case, i was running this code:
[self startRingcall];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3.0f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self stopRingcall];
});
- (void)startRingcall
{
if( self.audioPlayer )
[self.audioPlayer stop];
NSURL* musicFile = [NSURL fileURLWithPath:[[[UILayer sharedInstance] getResourceBundle] pathForResource:#"meetcalling" ofType:#"caf"]];
NSError *error;
self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:musicFile error:&error];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
if (error != nil) {
NSLog(#"meetringer sound error -> %#",error.localizedDescription);
}
self.audioPlayer.volume = 0;
[self.audioPlayer play];
self.audioPlayer.numberOfLoops = 1;
}
- (void)stopRingcall
{
if( self.audioPlayer )
[self.audioPlayer stop];
self.audioPlayer = nil;
}
I am streaming music file using AVAudioPlayer, It plays fine in background if i use nib file but when i try the same code using storyboard, The music playing stoped. I can't understand the reason why its stop playing in background when i using storyboard.
i am using this code for it
AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[audioPlayer setVolume:0.1];
[audioPlayer play];
Can any help me to play it in background using storyboard. Thanks in advance.
Let's try:
#implementation YourViewController
{
AVAudioPlayer *audioPlayer;
}
// if your are using ARC, after exiting this method, system will kill your audioPlayer. This is the reason why you can not play the music.
// in your method:
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
In Info.plist I added:
<key>UIBackgroundModes</key>
<array>
<string>audio</string>
<string>location</string>
</array>
...
I load the sound like this:
NSURL *urlFail = [NSURL fileURLWithPath:[NSString stringWithFormat:#"%#/criticalSound.wav", [[NSBundle mainBundle] resourcePath]]];
NSError *error;
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:urlFail error:&error];
[audioPlayer setDelegate:self];
audioPlayer.numberOfLoops = 0;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:nil];
[audioPlayer setVolume:1.0];
if (audioPlayer == nil){
}else{
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
musicPlayer = [MPMusicPlayerController iPodMusicPlayer];
if (musicPlayer.playbackState == MPMusicPlaybackStatePlaying)
{
self.wasMusicAppOn = YES;
[musicPlayer pause];
}else{
self.wasMusicAppOn = NO;
}
[audioPlayer play];
}
This works fine when app is active.
But I have a location update when application is in background and from time to time (like when user pass 500m) I should play this sound.
So I put this code there.
Anyway problem is that sound plays when app is in foreground but doesn't work when it is in background.
What am I doing wrong here?
As far as I've been able to tell, you must actually be playing sound while going into the background to be able to continue playing sound in the background.
Also, the description for AVAudioSessionCategoryAmbient states that "Your audio is silenced by screen locking and by the Silent switch (called the Ring/Silent switch on iPhone)".
You need to make couple of changes in plist file.
1) Set Required background mode to App plays audio
2) set Application does not run in background to YES.
NSError *setCategoryErr = nil;
NSError *activationErr = nil;
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error:&setCategoryErr];
[[AVAudioSession sharedInstance] setActive:YES error:&activationErr];
Then, you need to write these much code in AppDelegate
Now, you can easily run audio while phone screen locks or in background.
It works fine for me. :)
for more please refer to Playing Audio in background mode and Audio Session Programming Guide
I am doing sample application that play a song and that song will still playing even the application goes background.
In iOS 5 xcode simulator, it still play the song when app goes to background but when I run on iOS 5.0.1 iPad2 device, app stop playing sound when it goes to background.
The following are the code to play a song and do background task. Do you face this kind of issue in iOS 5.0.1? or am I missing something in code? But I am wondering how it is working in simulator?
- (void)viewDidLoad
{
[super viewDidLoad];
NSURL *url=[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"01-Track" ofType:#"mp3"]];
NSError *error;
audioPlayer=[[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];
if(error)
{
NSLog(#"Error in audio palyer: %#", [error localizedDescription]);
}
else
{
audioPlayer.delegate =self;
[audioPlayer prepareToPlay];
trackControl.maximumValue=[audioPlayer duration];
trackControl.value=0.0;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
}
}
-(IBAction)playAudio:(id)sender
{
UIBackgroundTaskIdentifier newTaskId = UIBackgroundTaskInvalid;
if([audioPlayer play]){
newTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:NULL];
}
Thanks!
For audio to continue working in background you should add a key called Required Background
Modes in your info.plist with value App plays audio.But it's use is not very much promoted by apple unless it's absolutely necessary.