MPMoviePlayerController는 다른 모든 오디오를 부드럽게 만듭니다 (MP 완료 후)

Question

특정 배경 음악을 재생하는 앱이 있습니다. 특정 버튼을 누르면 내비게이션 컨트롤러를 사용하여 새보기가 푸시됩니다. 새로운 뷰에는 MPMoviePlayerController와 AVCaptureSession에 공유 AudioSession이 있습니다. 보기가 닫히고 나면 백그라운드의 사운드는 원래의 사운드와 비교할 때 실제로 부드럽습니다. 연주 한 후에 볼륨을 너무 부드럽게 만드는 것은 무엇입니까?

NSError* error4 = nil; 
AVAudioSession* audioSession = [AVAudioSession sharedInstance]; 
if (![audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&error4]) { 
    NSLog(@"AVAudioSession setCategory failed: %@", [error4 localizedDescription]); 
} 

// Set audio session property "allow mixing" to true so audio can be recorded while it is playing 
UInt32 allowMixing = true; 
OSStatus status = AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing); 
if (status != kAudioSessionNoError) { 
    NSLog(@"AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers) failed: %ld", status); 
} 

// Activate the audio session 
error4 = nil; 
if (![audioSession setActive:YES error:&error4]) { 
    NSLog(@"AVAudioSession setActive:YES failed: %@", [error4 localizedDescription]); 
} 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectoryPath = [paths objectAtIndex:0]; 

NSString *proud = [[documentsDirectoryPath stringByAppendingPathComponent:@"imissyou"] stringByAppendingPathComponent:selectedCountry]; 

NSURL *movieURL = [[NSURL fileURLWithPath:proud] retain]; 
player = 

[[MPMoviePlayerController alloc] initWithContentURL: movieURL]; 
player.useApplicationAudioSession=YES; 

[player prepareToPlay]; 
player.controlStyle = MPMovieControlStyleNone; 
player.allowsAirPlay = NO; 
player.scalingMode = MPMovieScalingModeFill; 

player.view.frame = self.view.frame; 

[self.view insertSubview:player.view belowSubview:vImagePreview]; 

[player setFullscreen:YES animated:YES]; 

// ... 

[[NSNotificationCenter defaultCenter] 
addObserver:self 
selector:@selector(movieFinishedCallback:) 
name:MPMoviePlayerPlaybackDidFinishNotification 
object:player]; 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(exitedFullscreen:) name:MPMoviePlayerDidExitFullscreenNotification object:player]; 


[[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(moviePlayerWillExitFullscreen:) 
              name:MPMoviePlayerWillExitFullscreenNotification 
              object:player]; 


[player play]; 


session = [[AVCaptureSession alloc] init]; 
[session beginConfiguration]; 
session.sessionPreset = AVCaptureSessionPresetMedium; 

CALayer *viewLayer = self.vImagePreview.layer; 
NSLog(@"viewLayer = %@", viewLayer); 

AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session]; 
captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; 
captureVideoPreviewLayer.frame = self.vImagePreview.bounds; 
[captureVideoPreviewLayer setCornerRadius:14]; 
[captureVideoPreviewLayer setBorderWidth:3.0]; 
[captureVideoPreviewLayer setBorderColor:[[UIColor whiteColor] CGColor]]; 
[[vImagePreview layer] setCornerRadius:14]; 


[[vImagePreview layer] setBorderWidth:3.0]; 


[[vImagePreview layer] setBorderColor:[[UIColor whiteColor] CGColor]]; 

[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer]; 
[captureVideoPreviewLayer release]; 
AVCaptureDevice *device = [self frontFacingCameraIfAvailable]; 
NSError *error = nil; 
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error]; 
if (!input) { 
    // Handle the error appropriately. 
    NSLog(@"ERROR: trying to open camera: %@", error); 
} 

AVCaptureDevice *audioCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio]; 
NSError *error2 = nil; 
AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioCaptureDevice error:&error2]; 






AVCaptureMovieFileOutput *movieFileOutput = [[AVCaptureMovieFileOutput alloc] init]; 

NSString *archives = [documentsDirectoryPath stringByAppendingPathComponent:@"archives"]; 
NSString *editedfilename = [[selectedCountry lastPathComponent] stringByDeletingPathExtension]; 
NSString *datestring = [[editedfilename stringByAppendingString:@" "] stringByAppendingString:currentTime]; 
NSLog(@"%@", datestring); 
NSString *outputpathofmovie = [[archives stringByAppendingPathComponent:datestring] stringByAppendingString:@".mp4"]; 
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputpathofmovie]; 
[session addInput:input]; 
[session addInput:audioInput]; 
[session addOutput:movieFileOutput]; 
[session commitConfiguration]; 
[session startRunning]; 
[movieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self]; 
[movieURL release]; 
[outputURL release]; 

Answer 1

지금 알아 냈습니다. PlayAndRecord로 카테고리를 설정했습니다. 나는 속성을 변경 가야합니까 어떻게 바로

OSStatus propertySetError = 0; 
UInt32 allowMixing = true; 
propertySetError |= AudioSessionSetProperty(kAudioSessionProperty_OtherMixableAudioShouldDuck, sizeof(allowMixing), &allowMixing); 

Answer 2

오디오 세션이 배경 음악을 "더킹 (ducking)"할 수 있습니다. 이 기능을 사용하지 않으려면 "kAudioSessionProperty_OtherMixableAudioShouldDuck"속성을 false로 설정하십시오.