In my application audio is not being played when i put my application in background mode ..i have seen such issues in this site itself.it is mentioned that
1) in the app-info.plist add to background modes "audio"
2) in the code i added support for audio sessions
if([player isPlaying])
{
[player stop];
}
NSError *error=nil;
int trackid=arc4random()%10+1;
NSString *trackname=[NSString stringWithFormat:#"trk-%d",trackid];
NSLog(#"%#",trackname);
NSString *newAudioFile = [[NSBundle mainBundle] pathForResource:trackname ofType:#"mp3"];
player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:newAudioFile] error:NULL];
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
NSError *setCategoryError = nil;
[audioSession setCategory:AVAudioSessionCategoryPlayback error:&setCategoryError];
if (setCategoryError) { /* handle the error condition */ }
NSError *activationError = nil;
[audioSession setActive:YES error:&activationError];
if (activationError) { /* handle the error condition */ }
if(error) {
NSLog(#"%#",&error);
}
[player prepareToPlay];
[player play];
player.numberOfLoops=1;
but still it is not working when i put the application in backgroud mode.it resumes when i put the application back.have i missed something?
use this line in the - (void)viewDidLoad
[UIApplication sharedApplication].idleTimerDisabled = YES;
Related
Am working on an iPad/iPhone App & am playing a background music with this code snippet which I call in the Delegate's didFinishLaunchingWithOptions method:
-(void) playMusic {
NSLog(#"play music!");
NSString *sound_file;
if ((sound_file = [[NSBundle mainBundle] pathForResource:#"musicfile" ofType:#"mp3"])){
NSURL *url = [[NSURL alloc] initFileURLWithPath:sound_file];
self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:NULL];
self.audioPlayer.delegate = self;
[self.audioPlayer setNumberOfLoops:-1]; // Infinite loop
[self.audioPlayer prepareToPlay];
[self.audioPlayer setVolume:0.2];
[self.audioPlayer play];
} else {
NSLog(#"WARN : music file not found!");
}
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
}
But I see that this method alone is taking 0.43 seconds on an average, which is a lot! Am I doing it the right way? Or is there a faster way to start the music play ? Please help.
My environment : iOS5, XCode 4.3, iPad 2.0 is what I tested this with now
I am able to record video and output the movie to a file correctly. However, I have a problem with video recording (no video ouput) when trying to use AVAudioPlayer to play some audio. Does it mean that I cannot use AVCaptureSession and AVAudioPlayer at the same time? Here is my code to create the capture session and to play the audio. The video capture is started first, then during the capturing, I want to play some audio. Thanks so much for any help.
Code to create the capture session to record video (with audio) - output to a .mov file:
- (void)addVideoInput
AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
//... also some code for setting up videoDevice/frontCamera
NSError *error;
AVCaptureDeviceInput *videoIn = [AVCaptureDeviceInput
deviceInputWithDevice:frontCamera error:&error];
AVCaptureDeviceInput *audioIn = [AVCaptureDeviceInput
deviceInputWithDevice:audioDevice error:&error];
if (!error) {
if ([captureSession canAddInput:audioIn])
[captureSession addInput:audioIn];
else
NSLog(#"Couldn't add audio input.");
if ([captureSession canAddInput:videoIn])
[captureSession addInput:videoIn];
else
NSLog(#"Couldn't add video input.");
}
- (void)addVideoOutput
{
AVCaptureMovieFileOutput *m_captureFileOutput = [[AVCaptureMovieFileOutput alloc] init];
[captureSession addOutput:m_captureFileOutput];
[captureSession startRunning];
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSMutableString *filePath = [NSMutableString stringWithString:#"Movie.mov"];
NSString* fileRoot = [docDir stringByAppendingPathComponent:filePath];
NSURL *fileURL = [NSURL fileURLWithPath:fileRoot];
AVCaptureConnection *videoConnection = NULL;
for ( AVCaptureConnection *connection in [m_captureFileOutput connections] )
{
for ( AVCaptureInputPort *port in [connection inputPorts] )
{
if ( [[port mediaType] isEqual:AVMediaTypeVideo] )
{
videoConnection = connection;
}
}
}
[videoConnection setVideoOrientation:AVCaptureVideoOrientationLandscapeRight];
[m_captureFileOutput startRecordingToOutputFileURL:fileURL recordingDelegate:self];
[m_captureFileOutput release];
}
Code to play the audio, this function is call during the video capture session. If I don't call this function, the video is recorded and I am able to save to the .mov file. However, if I call this function, there's no output .mov file.
- (void)playAudio
{
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:#"AudioFile" ofType:#"mp3"];
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:soundFilePath];
AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
[fileURL release];
self.audioPlayer = newPlayer;
[newPlayer release];
[audioPlayer setDelegate:self];
[audioPlayer prepareToPlay];
[audioPlayer play];
}
I fixed the problem by setting up the audio session. I called the following function before creating the audio player object to play the audio. That way, I was able to record video (with audio) and play audio at the same time.
- (void)setupAudioSession {
static BOOL audioSessionSetup = NO;
if (audioSessionSetup) {
return;
}
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: nil];
UInt32 doSetProperty = 1;
AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(doSetProperty), &doSetProperty);
[[AVAudioSession sharedInstance] setActive: YES error: nil];
audioSessionSetup = YES;
}
- (void)playAudio
{
[self setupAudioSession];
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:#"AudioFile" ofType:#"mp3"];
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:soundFilePath];
AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
[fileURL release];
self.audioPlayer = newPlayer;
[newPlayer release];
[audioPlayer setDelegate:self];
[audioPlayer prepareToPlay];
[audioPlayer play];
}
I want to play music with an AVAudioPlayer using an NSTimer, but [player prepareToPlay] returns NO & doesn't play in the background.
Can somebody give me some idea?
Here's my code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[NSTimer scheduledTimerWithTimeInterval:10 target:self selector:#selector(playMusic:) userInfo:nil repeats:NO];
[self.window makeKeyAndVisible];
return YES;
}
- (void)playMusic:(NSTimer *)timer{
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
NSString *fileName = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:#"Apologize.mp3"];
NSURL *fileUrl = [NSURL fileURLWithPath:fileName];
NSError *error;
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileUrl error:&error];
if ([player prepareToPlay]) {
[player play];
NSLog(#"start!");
}else{
NSLog(#"error msg ：%#",error);
}
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
if ([[UIApplication sharedApplication] respondsToSelector:#selector(beginReceivingRemoteControlEvents)]){
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
}
UIBackgroundTaskIdentifier backgroundTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
// /* just fail if this happens. */
[[UIApplication sharedApplication] endBackgroundTask:backgroundTask];
}];
}
You need to do this init in the viewDidLoad :
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:#"test"
ofType:#"mp3"];
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:soundFilePath];
self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL
error:nil];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
This is for the audio initialization. Here, with a MP3 named test, imported in the project.
Note that the beginReceivingRemoteControlEvents part is very important. Without it, you cannot start playing from background, just keep on listening to music already playing from foreground.
Now you need to listen to the event didEnterInBackGround (you could go with the applicationDidEnterBackground of your app delegate, but this way you can put the code in the class it belongs to):
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(didEnterBG:)
name:UIApplicationDidEnterBackgroundNotification
object:nil];
And now in that didEnterBG method :
self.backgroundTimer = [NSTimer scheduledTimerWithTimeInterval:10.0 target:self selector:#selector(backgroundWork) userInfo:nil repeats:YES];
[self.backgroundTimer fire];
Here i make this sound repeat every 10s for personal reasons, but do whatever you need.
Finally, the backgroundWork method :
- (void)backgroundWork{
[self.audioPlayer prepareToPlay];
[self.audioPlayer play];
}
Now your audio file is playing in background :-)
You should also note that your app need to have specific rights to keep doing jobs in background. You need to check the box under 'YourTarget' -> Capabilities -> Background Modes : Audio and AirPlay. Otherwise, the OS will terminate you app in a few minutes in real conditions (with no debugger or instrument).
before going to code. you need to tell the OS that you want permission to play music in background.
you can do that by setting a Key in your app's info.plist
<key>UIBackgroundModes</key>
<array>
<string>audio</string>
</array>
doing so, you will be able to play audio when app moves to background.
I have the same issue, but I found the solution from this post: http://developer.apple.com/library/ios/#qa/qa1668/_index.html
#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
NSError *setCategoryError = nil;
[audioSession setCategory:AVAudioSessionCategoryPlayback error:&setCategoryError];
if (setCategoryError) { /* handle the error condition */ }
NSError *activationError = nil;
[audioSession setActive:YES error:&activationError];
if (activationError) { /* handle the error condition */ }
Here is my code on button click
- (void)playButton:(id)sender
{
NSLog(#"Play Button Clicked!!!...");
audioPlayer = [self setUpAudioPlayer:[songs objectAtIndex:i]];
}
-(AVAudioPlayer *)setUpAudioPlayer:(NSString *)filename
{
NSLog(#"File name : %#",filename);
NSString *path = [[NSBundle mainBundle] pathForResource:filename ofType:#"caf"];
NSLog(#"File path = %#",path);
AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:nil];
//audioPlayer.volume = 0.5;
[audioPlayer prepareToPlay];
[audioPlayer play];
NSLog(#"Song is playing....");
return [audioPlayer autorelease];
}
here songs is NSMutableArray which contains file name... All things go correct with NSLog... But no sound is coming and no error comes.. What is wrong with the code..???
Your audio player is probably getting released as soon as it starts playing. Try to retain it after setUpAudioPlayer is called.
Most probably you need to initialize an audio session, some like this
- (void)setupAudioSession
{
AVAudioSession *session = [AVAudioSession sharedInstance];
NSError *error = nil;
[session setCategory: AVAudioSessionCategoryPlayback error: &error];
if (error != nil)
NSLog(#"Failed to set category on AVAudioSession");
// AudioSession and AVAudioSession calls can be used interchangeably
OSStatus result = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, RouteChangeListener, self);
if (result) NSLog(#"Could not add property listener! %d\n", result);
BOOL active = [session setActive: YES error: nil];
if (!active)
NSLog(#"Failed to set category on AVAudioSession");
}
I want to play an audio loop by turning on a switch but i do not want the loop to end until the switch is turned off. When the loop ends i want it to simply start back at the beginning as to be continuos.
Try something like this. Note the -1 tells the music to repeat indefinitely:
Import this file at the top of your file:
#import <AVFoundation/AVFoundation.h>
Then to use it:
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:resourcePath ofType:#"caf"];
NSError *activationError = nil;
NSError *audioPlayerInitError = nil;
[[AVAudioSession sharedInstance] setActive: YES error:&activationError];
NSURL *newURL = [NSURL fileURLWithPath:soundFilePath];
AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:newURL error:&audioPlayerInitError];
[newPlayer prepareToPlay];
[newPlayer setVolume:.8];
[newPlayer setNumberOfLoops:-1]; // -1 means play indefintely
[newPlayer setDelegate: self];
[newPlayer play];
[newPlayer release];
And then to stop it you would do:
if ([newPlayer isPlaying]) {
[newPlayer stop];
}