I've tried the code to avoid the sleep mode interruption. It's working, but now I have a problem with interruptions when a call or sms is coming in to the iPhone. The song in my music application is stopped at that time. I want to automatically resume the song where it was stopped once the call is over.
- (void) audioPlayerBeginInterruption: (AVAudioPlayer *) player {
if (playing) {
playing = NO;
interruptedOnPlayback = YES;
[self updateViewForPlayerState];
}
}
- (void) audioPlayerEndInterruption: (AVAudioPlayer *) player {
if (interruptedOnPlayback) {
[player prepareToPlay];
[player play];
playing = YES;
interruptedOnPlayback = NO;
}
}
But it doesn't work. Please help me here, thanks in advance.
Try Apple's guide to Audio Interruptions.
Related
My application worked fine when I play and stop the music at the start of the running but when I later stopped the music and let the application idle for quite some time and clicked the play button, the application didn't output any warning and no music is played even the log output my music is now playing. I have no idea what is the error that leads to this as nothing is wrong. Is it a common behavior in IOS simulator?
This is my audio code just in case.
-(void)musicIsPlaying:(id)sender
{
AVAudioPlayer *theAudio = [sender objectForKey:#"audio"];
UIButton *btn = [sender objectForKey:#"button"];
if (btn.selected == TRUE)
{
[btn setTitle:#"Stop" forState:UIControlStateNormal];
[btn setSelected:FALSE];
if(theAudio.isPlaying == NO)
{
[theAudio prepareToPlay];
[theAudio play];
NSLog(#"music playing");
}
}
else
{
[btn setTitle:#"Play" forState:UIControlStateNormal];
[btn setSelected:TRUE];
if(theAudio.isPlaying==YES)
{
[theAudio stop];
NSLog(#"music stop playing");
}
}
}
You should call method to resume your play when Application becomes active. So, write your code to resume your play in Appdelegate.
- (void)applicationDidBecomeActive:(UIApplication *)application
{
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
you need to Declare AVAudioPlayer in Interface
#interface AudioViewController ()
{
AVAudioPlayer *theAudio;
}
#end
the use this "theAudio" object in your method(musicIsPlaying)..like
theAudio = [sender objectForKey:#"audio"];
Hope..it will work for you...
I am using Avplayer to show video clips and when i go back (app in background) video stop. How can i keep playing the video?
I have search about background task & background thread ,IOS only support music in background (Not video)
http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html
here is some discussion about play video in background
1) https://discussions.apple.com/thread/2799090?start=0&tstart=0
2) http://www.cocoawithlove.com/2011/04/background-audio-through-ios-movie.html
But there are many apps in AppStore, that play video in Background like
Swift Player : https://itunes.apple.com/us/app/swift-player-speed-up-video/id545216639?mt=8&ign-mpt=uo%3D2
SpeedUpTV : https://itunes.apple.com/ua/app/speeduptv/id386986953?mt=8
This method supports all the possibilities:
Screen locked by the user;
List item
Home button pressed;
As long as you have an instance of AVPlayer running iOS prevents auto lock of the device.
First you need to configure the application to support audio background from the Info.plist file adding in the UIBackgroundModes array the audio element.
Then put in your AppDelegate.m into
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions:
these methods
[[AVAudioSession sharedInstance] setDelegate: self];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
and #import < AVFoundation/AVFoundation.h >
Then in your view controller that controls AVPlayer
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
and
- (void)viewWillDisappear:(BOOL)animated
{
[mPlayer pause];
[super viewWillDisappear:animated];
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
}
then respond to the
- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
switch (event.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause:
if([mPlayer rate] == 0){
[mPlayer play];
} else {
[mPlayer pause];
}
break;
case UIEventSubtypeRemoteControlPlay:
[mPlayer play];
break;
case UIEventSubtypeRemoteControlPause:
[mPlayer pause];
break;
default:
break;
}
}
Another trick is needed to resume the reproduction if the user presses the home button (in which case the reproduction is suspended with a fade out).
When you control the reproduction of the video (I have play methods) set
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(applicationDidEnterBackground:) name:UIApplicationDidEnterBackgroundNotification object:nil];
and the corresponding method to be invoked that will launch a timer and resume the reproduction.
- (void)applicationDidEnterBackground:(NSNotification *)notification
{
[mPlayer performSelector:#selector(play) withObject:nil afterDelay:0.01];
}
Its works for me to play video in Backgorund.
Thanks to all.
If you try to change the background mode:
Sorry, App store wont approve it.MPMoviePlayerViewController playback video after going to background for youtube
In my research, someone would take the sound track out to play in te background when it goes into background as the video would be pause and get the playbacktime for resume playing when go into foreground
It is not possible to play background music/video using Avplayer. But it is possible using
MPMoviePlayerViewController. I have done this in one of my app using this player & this app
is run successfully to appstore.
Try with this snippet, I've already integrated this with my app & it's being useful for me..hope this will work for you!!
Follow the steps given below:
Add UIBackgroundModes in the APPNAME-Info.plist, with the selection
App plays audio
Then add the AudioToolBox framework to the folder frameworks.
In the APPNAMEAppDelegate.h add:
-- #import < AVFoundation/AVFoundation.h>
-- #import < AudioToolbox/AudioToolbox.h>
In the APPNAMEAppDelegate.m add the following:
// Set AudioSession
NSError *sessionError = nil;
[[AVAudioSession sharedInstance] setDelegate:self];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];
/* Pick any one of them */
// 1. Overriding the output audio route
//UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
//AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute,
sizeof(audioRouteOverride), &audioRouteOverride);
========================================================================
// 2. Changing the default output audio route
UInt32 doChangeDefaultRoute = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker, sizeof(doChangeDefaultRoute), &doChangeDefaultRoute);
into the
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
but before the two lines:
[self.window addSubview:viewController.view];
[self.window makeKeyAndVisible];
Enjoy Programming!!
Swift version for the accepted answer.
In the delegate:
AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: nil)
AVAudioSession.sharedInstance().setActive(true, error: nil)
In the view controller that controls AVPlayer
override func viewDidAppear(animated: Bool) {
UIApplication.sharedApplication().beginReceivingRemoteControlEvents()
self.becomeFirstResponder()
}
override func viewWillDisappear(animated: Bool) {
mPlayer.pause()
UIApplication.sharedApplication().endReceivingRemoteControlEvents()
self.resignFirstResponder()
}
Don't forget to "import AVFoundation"
In addition to fattomhk's response, here's what you can do to achieve video forwarding to the time it should be after your application comes in foreground:
Get currentPlaybackTime of playing video when go to background and store it in lastPlayBackTime
Store the time when application goes to background (in userDefault probably)
Again get the time when application comes in foreground
Calculate the duration between background and foreground time
Set current playback time of video to lastPlayBackTime + duration
If you are Playing video using WebView you can handle using javascript to play video on background.
strVideoHTML = #"<html><head><style>body.........</style></head> <body><div id=\"overlay\"><div id=\"youtubelogo1\"></div></div><div id=\"player\"></div> <script> var tag = document.createElement('script'); tag.src = \"http://www.youtube.com/player_api\"; var firstScriptTag = document.getElementsByTagName('script')[0]; firstScriptTag.parentNode.insertBefore(tag, firstScriptTag); var player; events: { 'onReady': onPlayerReady, } }); } function onPlayerReady(event) { event.target.playVideo(); } function changeBG(url){ document.getElementById('overlay').style.backgroundImage=url;} function manualPlay() { player.playVideo(); } function manualPause() { player.pauseVideo(); } </script></body> </html>";
NSString *html = [NSString stringWithFormat:strVideoHTML,url, width, height,videoid;
webvideoView.delegate = self;
[webvideoView loadHTMLString:html baseURL:[NSURL URLWithString:#"http://www.your-url.com"]];
On view diappear call
strscript = #"manualPlay();
[webvideoView stringByEvaluatingJavaScriptFromString:strscript];
I'd like to add something that for some reason ended up being the culprit for me. I had used AVPlayer and background play for a long time without problems, but this one time I just couldn't get it to work.
I found out that when you go background, the rate property of the AVPlayer sometimes seems to dip to 0.0 (i.e. paused), and for that reason we simply need to KVO check the rate property at all times, or at least when we go to background. If the rate dips below 0.0 and we can assume that the user wants to play (i.e. the user did not deliberately tap pause in remote controls, the movie ended, etc) we need to call .play() on the AVPlayer again.
AFAIK there is no other toggle on the AVPlayer to keep it from pausing itself when app goes to background.
i am getting wrong playback state in MP music player.
while playing a song i am getting pause state.
My app is working fine in ios 4.but i am having this issue in ios 5.
can anybody Help me ??
My code is here.
[musicPlayer stop];
if (userMediaItemCollection)
{
userMediaItemCollection=nil;
}
musicPlayer.nowPlayingItem=nil;
userMediaItemCollection=[MPMediaItemCollection collectionWithItems:[mediaItemCollection items]];
[musicPlayer setQueueWithItemCollection:userMediaItemCollection];
[musicPlayer setNowPlayingItem:
[[userMediaItemCollectionitems]objectAtIndex:indexOfCurrentObject]];
[self enablePrevAndNextButtons];
[musicPlayer play];
}
-(void)playbackStateDidChanged:(NSNotification *)notification
{
if (musicPlayer.playbackState!=MPMusicPlaybackStatePlaying)
{
[playPauseButton setBackgroundImage:[UIImage imageNamed:#"play_iPad.png"] forState:UIControlStateNormal];
}
else if(musicPlayer.playbackState==MPMusicPlaybackStatePlaying)
{
[playPauseButton setBackgroundImage:[UIImage imageNamed:#"pause_iPad.png"] forState:UIControlStateNormal];
}
I have also reported this bug to Apple. I was able to reproduce it 100% of the time by doing the following:
Launch application that uses MPMusicPlayerController.
Launch the "Music" App.
Hit Play, Skip, Skip, Pause, Play, Pause
Open the original application and the MPMusicPlaybackState of MPMusicPlayerController will be incorrect.
None of the proposed solutions here worked for me. The solution that did work was to keep track of when the bug was occurring and updating the UI specially in these cases.
When the UIApplicationDidBecomeActiveNotification notification is received (see matbur post for more details on this), see if audio is actually not playing when the MPMusicPlaybackState said it was:
-(BOOL) isPlaybackStateBugActive {
MPMusicPlaybackState playbackState = self.musicPlayer.playbackState;
if (playbackState == MPMusicPlaybackStatePlaying) {
AudioSessionInitialize (NULL, NULL, NULL, NULL);
UInt32 sessionCategory = kAudioSessionCategory_AmbientSound;
AudioSessionSetProperty (kAudioSessionProperty_AudioCategory, sizeof (sessionCategory), &sessionCategory);
AudioSessionSetActive (true);
UInt32 audioIsPlaying;
UInt32 size = sizeof(audioIsPlaying);
AudioSessionGetProperty(kAudioSessionProperty_OtherAudioIsPlaying, &size, &audioIsPlaying);
if (!audioIsPlaying){
NSLog(#"PlaybackState bug is active");
return YES;
}
}
return NO;
}
Don't forget to import the AudioToolbox framework.
None of these workarounds fix the issue for my app. It is a bug in iOS, and my app will never function properly until Apple fixes it.
I have a music player with a play/pause button. When music is playing, the button shows the "pause" icon. When music is paused, the button shows the "play" icon - just like all music apps. I can replicate the bug at any time by doing the following:
1. Play music in my app (the play/pause button shows the "pause" icon correctly)
2. Background my app and lock my phone for ~10 minutes
3. Double tap home and hit the pause button from the iPod controls
4. Unlock my phone and open my app again
5. Music will be stopped, but my app still shows the "pause" icon when it should so "play"
I've done extensive debugging and logging to ensure that the method that updates my play/pause button is always called when my application becomes active. The issue is that when I re-enter my app, the playback state of MPMusicPlayer is still set to MPMusicPlaybackStatePlaying even when music is stopped/paused.
I filed a bug report for this about a year ago and haven't heard anything from Apple. If someone else would file one it would be greatly appreciated.
I have the same problem but when I play/pause many times when my app is in background, I reported the bug to Apple and hope to get an amswer soon, I want to know if my coding is wrong or there is an API problem. If this was the error you were having, this may be helpful. I came to a workaround which even though isnt the best solution, for my app is acceptable:
In the viewDidLoad, add this:
NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
[notificationCenter addObserver: self
selector: #selector (handle_ApplicationDidBecomeActive:)
name: UIApplicationDidBecomeActiveNotification
object: nil];
Then, create a handle_ApplicationDidBecomeActive method, and add this:
- (void) handle_ApplicationDidBecomeActive: (id) notification
{
if (musicPlayer.playbackState!=MPMusicPlaybackStatePlaying)
{
[playPauseButton setBackgroundImage:[UIImage imageNamed:#"play_iPad.png"] forState:UIControlStateNormal];
[musicPlayer pause];
}
else if(musicPlayer.playbackState==MPMusicPlaybackStatePlaying)
{
[playPauseButton setBackgroundImage:[UIImage imageNamed:#"pause_iPad.png"] forState:UIControlStateNormal];
[musicPlayer pause];
}
}
(dont put this code inside your playbackStateDidChanged method as this may generate an endless loop)
This will sync the state of your buttons and music player to the one reported by the API. in the cases in which there is a coincidence, there will be no impact of any type, in the other cases, the player will pause/play accordingly.
I experienced the same problem with the release of iOS 5. I found that the playbackState property does get updated, but after a delay, so it's not yet set when your playbackStateDidChanged method runs.
My workaround was to set my own instance variable called musicPlayerRecentlyStartedPlaying whenever I start playback. Then I use a method called from a timer to check both that variable and the playbackState property to find out if the player is really playing:
- (void)playMusic {
[self.musicPlayer play];
self.musicPlayerRecentlyStartedPlaying = TRUE;
self.musicControlsUpdateTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(updateMusicControls:) userInfo:nil repeats:TRUE];
}
- (void)stopMusic {
[self.musicPlayer stop];
self.musicPlayerRecentlyStartedPlaying = FALSE;
[self.musicControlsUpdateTimer invalidate];
}
- (void)updateMusicControls:(NSTimer *)timer {
BOOL playing = (([self.musicPlayer playbackState] == MPMusicPlaybackStatePlaying)&&(self.musicPlayer.nowPlayingItem));
if (!playing) {
// check to see if we recently started playing
if (self.musicPlayerRecentlyStartedPlaying) {
playing = TRUE;
}
} else {
// once the property is updated, we no longer need this
self.musicPlayerRecentlyStartedPlaying = FALSE;
}
}
You might not need to call updateMusicControls from a timer, but I do because I'm also updating the position of a progress bar as the music plays.
This code using when previous Button click Previous song will be play
- (IBAction)playPreviousSongInList:(id)sender {
static NSTimeInterval skipToBeginningOfSongIfElapsedTimeLongerThan = 3.5;
NSTimeInterval playbackTime = self.musicPlayer.currentPlaybackTime;
if (playbackTime <= skipToBeginningOfSongIfElapsedTimeLongerThan) {
[self.musicPlayer skipToPreviousItem];
} else {
[self.musicPlayer skipToBeginning];
}
}
So I have an application and I want to keep it working even if the screen is turned off.
Previously when I wanted to do that I used this hack/trick - I play a silent/empty sound in a loop in the background (AudioServicesPlaySystemSound) so if user presses the on/off button the application still works in the background - so it never allow iPhone to go to sleep mode - it just turned off the screen and maybe things like wifi or bluetooth (and on the iPod Touch accelerometers as far as I remember). And it worked. I wanted to use the same trick in my new application but when I was testing it now it seems it doesn't work anymore. The sound in the background plays (when I replace "empty" audio file with some sound I can hear it play) even with screen turned off but the sound it should play (using AVAudioPlayer) doesn't play (even when I turn the screen on again).
I don't know at which point it stopped working (it worked on 3.x OS for sure). Am I doing something wrong? Did Apple changed/fixed the "hack" that allowed your app to work even with screen turned off? Is there another way to allow the device to go to sleep (and drain the battery less) but continue to work?
This is the code I use to play background/silent sound:
-(void) playSilentSound
{
CFBundleRef mainBundle = CFBundleGetMainBundle ();
CFURLRef silentUrl = CFBundleCopyResourceURL (mainBundle, CFSTR ("silence"), CFSTR ("aiff"), NULL);
AudioServicesCreateSystemSoundID (silentUrl, &silentSound);
silentTimer = [NSTimer scheduledTimerWithTimeInterval: 2.0 target: self selector:#selector(playSilence) userInfo: nil repeats: YES];
}
-(void) playSilence
{
AudioServicesPlaySystemSound (silentSound);
}
And this is how I play the sound that should play even if the screen is turned off:
-(BOOL) playSound: (NSString *) path withLoops: (BOOL) loops stopAfter: (int) seconds
{
NSError *error;
player = [[AVAudioPlayer alloc] initWithContentsOfURL: [NSURL fileURLWithPath: path] error: &error];
player.delegate = self;
player.numberOfLoops = 0;
player.volume = volume;
secondsPlayed = 0;
loop = loops;
BOOL played = [player play];
if(played && seconds > 0)
{
timer = [[NSTimer scheduledTimerWithTimeInterval: 0.5 target: self selector: #selector(stopPlaying:) userInfo: [NSNumber numberWithInt: seconds] repeats: YES] retain];
secondsLimit = seconds;
} else {
secondsLimit = -1;
}
}
-(void) stopPlaying:(NSTimer*)theTimer
{
if(secondsLimit > 0 && (secondsPlayed + [player currentTime]) >= secondsLimit)
{
[player stop];
[timer release];
timer = nil;
}
}
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)sender successfully:(BOOL)flag
{
if(sender == player)
{
if(flag) { secondsPlayed += sender.duration; }
if(loop) { [player play]; }
}
}
The code is a bit complicated maybe - it could be just the first few lines - it's made that way so you can play only X seconds of sound (if sound is shorter than X it will play few loops until the total time is >= X). And of course everything is working fine when the screen is left on.
Also - if you find the code useful in your projects (like playSound:withLoops:stopAfter:) - feel free to use it (but it would be cool if you send me a message so I would know that I helped :)).
So the answer is to set session category. Some categories just turn off sound when the device is being locked. For me the best option was AVAudioSessionCategoryPlayback
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: nil];
I don't know about Apple fixing stuff, but in iOS 4 there are now official ways to continue doing things in the background which you should take advantage of.
I'm having an issue using AVAudioPlayer where I want to reset a player if it's currently playing and have it play again.
I try the following with no luck:
The sound plays once but then the second time i select the button it stops the sound, the third time starts the sound up again.
//Stop the player and restart it
if (player.playing) {
NSLog(#"Reset sound: %#", selectedSound);
[player stop];
[player play];
} else {
NSLog(#"playSound: %#", selectedSound);
[player play];
}
I've also tried using player.currentTime = 0 which indicates that would reset the player, that didn't work, I also tried resetting currentTime = 0 and then calling play that didn't work.
//Stop the player and restart it
if (player.playing) {
NSLog(#"Reset sound: %#", selectedSound);
player.currentTime = 0;
[player play];
} else {
NSLog(#"playSound: %#", selectedSound);
[player play];
}
For your situation I would try the following
//Pause the player and restart it
if (player.playing) {
NSLog(#"Reset sound: %#", selectedSound);
[player pause];
}
player.currentTime = 0;
[player play];
If you are going to immediately play the sound again, I would suggest pause instead of stop. Calling stop "Stops playback and undoes the setup needed for playback."
As indicated, if you want the sound to play again, you should avoid disabling the AVAudioPlayer instance with a stop but rather, just issue a reset of the position where it is playing. So, don't use stop() or pause() but as Plumenator mentioned, just issue .currentTime=0. So in your case, you would simply do:
if (player.isPlaying) {
player.currentTime = 0
} else {
player.play()
}
Swift example:
player.currentTime = 0.0;