I'm trying to create an iOS app which can record audio and video while simultaneously outputting audio to the speakers.
To do the recording and preview, I'm using AVCaptureSession, an AVCaptureConnection each for both video and audio, and an AVAssetWriterInput each for both video and audio. I basically achieved this by following the RosyWriter example code.
Prior to setting up recording in this fashion, I was using AVAudioPlayer to play audio.
Now, if I am in the middle of capturing (not even recording, just capturing for preview), and attempt to use AVAudioPlayer, my captureOutput callbacks on my AVCaptureAudioDataOutputSampleBufferDelegate class stop getting called.
Is there a workaround for this?
Is there another, lower level service I should use to be playing audio that won't stop my capture?
mc.
You first set the AVAudioSession and its category. For example in viewDidLoad method,
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionMixWithOthers|AVAudioSessionCategoryOptionDefaultToSpeaker error:nil];
Therefore you can play BGM
self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:music_url error:nil];
[self.player setDelegate:self];
[self.player play];
and record the movie
self.captureSession = [[AVCaptureSession alloc] init];
/* ... addInput AVCaptureDeviceInput AVMediaTypeVideo & AVMediaTypeAudio */
/* ... addOutput */
[self.captureSession startRunning];
AVCaptureMovieFileOutput *m_captureFileOutput =[self.captureSession.outputs objectAtIndex:0];
[m_captureFileOutput startRecordingToOutputFileURL:saveMovieURL recordingDelegate:self];
Related
I'm trying to use new ios8 notification actions to let users play audio from their lock screen.
I manage to download the data in the background, but the avaudioplayer does not seem to play.
Any help would be greatly appreciated !
Here is the code :
- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void(^)())completionHandler
{
//handle the actions
if ([identifier isEqualToString:#"ACCEPT_IDENTIFIER"]){
Message *newMessage = [Message rawMessageToInstance:[userInfo valueForKey:#"message"]];
AVAudioSession* session = [AVAudioSession sharedInstance];
BOOL success; NSError* error;
success = [session setCategory:AVAudioSessionCategoryPlayback
error:&error];
if (!success)
NSLog(#"AVAudioSession error setting category:%#",error);
[session setActive:YES error:nil];
NSLog(#"%lu",newMessage.identifier);
[ApiUtils downloadAudioFileAtURL:[newMessage getMessageURL] success:^void(NSData *data) {
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithData:data error:nil];
[player setVolume:2];
[player play];
[self performSelector:#selector(completeNotif:) withObject:completionHandler afterDelay:[player duration]];
} failure:^(){
completionHandler();
}];
}
}
I had the same problem ... first I came up, it must have to do something with background and sound playing options - so I added the background audio flag to the info.plist.
With standard AVAudio stuf it works on the simulator, but not on the device. The special hook is, that you want to start the audio while you are in background - so add the code from anger: How to use kAudioSessionProperty_OverrideCategoryMixWithOthers before starting with the AVAudioPlayer and it will also work on the device.
Hope that helps, for me it works.
I'm developing an application that allows to stream a list of audio files that will be played one after the other. I'm using mattgallagher's audiostreamer from github.
This works fine when the app is active, but when it goes in the background and one song finished, the next one fails to start.In other words, the initialization of the audio streamer is not working in the background.
In my info.plist I have set the "Required background modes" to "App plays audio" but this is not helping to start a stream when the app is in the background.
Its been like a week now I'm trying to search for a solution, but didn't find any. Can anyone help me solving this problem?
You application will be stopped as soon as you stop playing the audio file, so the second one does not have a chance to start playing.
Initialise one more audio session, that will play a short silent audio file in a loop. You can keep it as long as you need.
The session should allow mixing the audio, which will have no effect on your audio because the audio file is silent.
AudioSessionInitialize(NULL, NULL, NULL, NULL);
AudioSessionSetActive(YES);
UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &sessionCategory);
UInt32 allowMixing = true;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing);
NSString* path = [[NSBundle mainBundle] pathForResource:#"silentAudio" ofType:#"m4a"];
NSURL* fileURL = [NSURL fileURLWithPath:path];
NSError* error = nil;
self.beatPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:&error];
if (error != nil)
{
//process the error
}
_beatPlayer.numberOfLoops = -1;
[_beatPlayer play];
Stopping the playback will also stop the application threads:
[_beatPlayer stop];
You should use UIBackgroundModes: iPhoneOSKeys.
In your .plist file:
<key>UIBackgroundModes</key>
<array>
<string>audio</string>
</array>
Update:
Add this to your init code:
NSError *setCategoryErr = nil;
NSError *activationErr = nil;
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error:&setCategoryErr];
[[AVAudioSession sharedInstance] setActive:YES error:&activationErr];
I have a series of audio files which I want to play in sequence. I setup audioPlayerDidFinishPlaying delegate method to start the next file in the sequence. This works with no problem if I turn off screen lock or if I run it on the emulator or on an iOS4 device. However, when I run it on a disconnected device, iOS5, screen locked, it stops after the first track. Is there some way to start a new sound track after the screen lock has come on?
Here is my basic code
// Registers this class as the delegate of the audio session.
[[AVAudioSession sharedInstance] setDelegate: self];
// Use this code instead to allow the app sound to continue to play when the screen is locked.
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: nil];
UInt32 doSetProperty = 0;
AudioSessionSetProperty ( kAudioSessionProperty_OverrideCategoryMixWithOthers,
sizeof (doSetProperty),
&doSetProperty
);
// Registers the audio route change listener callback function
AudioSessionAddPropertyListener (
kAudioSessionProperty_AudioRouteChange,
audioRouteChangeListenerCallback,
self
);
// Activates the audio session.
NSError *activationError = nil;
[[AVAudioSession sharedInstance] setActive: YES error: &activationError];
NSString *path = [[NSBundle mainBundle] pathForResource:filename ofType:#"m4a"];
float vol = [appSoundPlayer volume];
AVAudioPlayer * newAudio=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
self.appSoundPlayer = newAudio; // automatically retain audio and dealloc old file if new file is loaded
[newAudio release]; // release the audio safely
appSoundPlayer.delegate = self;
[appSoundPlayer prepareToPlay];
[appSoundPlayer setNumberOfLoops:0];
[appSoundPlayer play];
[appSoundPlayer setVolume:vol];
[progTime setProgress:0];
}
- (void) audioPlayerDidFinishPlaying: (AVAudioPlayer *) lappSoundPlayer successfully: (BOOL) flag {
//... code here to select nex sound track
[lappSoundPlayer play];
}
I have already made it so the app continues to play the current track even when screen lock comes on, I just can't get it to start up the next track.
Note: I have verified that this was working in iOS4.
Have you set up an audio session category, specifically AVAudioSessionCategoryPlayback, as described here?
[[AVAudioSession sharedInstance] setDelegate: self];
NSError *error = nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&error];
If that doesn't work, another thing to try, according to user ascanio in this message in the Apple dev forums, is to set your app up to listen for remote control events:
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
I want to play the music from internet by url.
I create a simply project that has one button with the following code:
NSURL *url = [[NSURL alloc] initWithString:#"http://someURL.mp3"];
NSError **err;
QTMovie *movie = [[QTMovie alloc] initWithURL:url error:err];
[movie play];
It works but with some delay (I think because it waits while file has been fully downloaded).
So what I need to do that the music starts to play immediately (when, for example, 10% of file has been downloaded)?
Use -[QTMovie autoplay] to automatically play the music once enough data has been downloaded.
In your case:
NSURL *url = [[NSURL alloc] initWithString:#"http://someURL.mp3"];
NSError **err;
QTMovie *movie = [[QTMovie alloc] initWithURL:url error:err];
[movie autoplay];
From the QTMovie class reference:
The autoplay method configures a QTMovie object to begin playing as soon as enough data is available that the playback can continue uninterrupted to the end of the movie.
If you can consider displaying a Quicktime window over your app, you can use this code :
NSString *url = #"http://someURL.mp3";
UIWebView* tempAudioPlayer = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
[tempAudioPlayer loadHTMLString:[NSString stringWithFormat:#"<iframe frameborder=\"0\" width=\"0\" height=\"0\" src=\"%#\"></iframe>", url] baseURL:nil];
[self addSubview:tempAudioPlayer];
I first create a UIWebView which will not be displayed. Then I loadHTMLString a <iframe> in it, with the URL of my file as the src value. And I add it to my view. Quicktime appears immediately.
I am developing an iPhone application that plays sounds. I do not want interrupt or play another sound, if a sound is already playing, regardless of where it was "spawned" from to play. My code is as follows:
if(distance <= 10)
{
NSString *soundPath = [[NSBundle mainBundle] pathForResource:#"sound" ofType:#"wav"];
SystemSoundID soundID;
AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath: soundPath], &soundID);
AudioServicesPlaySystemSound(soundID);
}
Simply, I do not want to play a new sound if one is already playing.
I do not want to queue another sound to play if one is already playing.
Is this possible?
I suggest you use the AVAudioPlayer API rather than AudioServicesPlaySystemSound. It has a delegate which you can use, which defines a method -audioPlayerDidFinishPlaying:successfully: which will tell you when your sound finishes playing. The AVPlayer class also has a -playing method which you can check to see if a sound is currently playing.
So, in other words, do this instead:
NSError *error;
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:soundPath error:&error];
if(!player)
[self doSomethingWithError:error];
[player setDelegate:self];
[player play];