Iphone Avfoundation-同时播放和录制视频(以及音频和预览)
我正在尝试同时录制和播放视频。这在avfoundation中是否可行?目前,只要我不录制音频,我就能做到这一点。一旦我将音频输入添加到AVCaptureSession并重新启动整个程序,我就会收到“AVCaptureSessionWasInterruptedNotification”并停止录制 这就是我播放视频的方式Iphone Avfoundation-同时播放和录制视频(以及音频和预览),iphone,video,avfoundation,video-capture,recording,Iphone,Video,Avfoundation,Video Capture,Recording,我正在尝试同时录制和播放视频。这在avfoundation中是否可行?目前,只要我不录制音频,我就能做到这一点。一旦我将音频输入添加到AVCaptureSession并重新启动整个程序,我就会收到“AVCaptureSessionWasInterruptedNotification”并停止录制 这就是我播放视频的方式 MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithConten
MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:path]];
[moviePlayer.view setFrame:self.playerView.bounds];
moviePlayer.useApplicationAudioSession=NO;
self.player = moviePlayer;
[moviePlayer release];
[self.playerView addSubview:player.view];
[player play];
这就是我录制视频的方式:
NSError *error;
AVCamCaptureManager *captureManager = [[AVCamCaptureManager alloc] init];
if ([captureManager setupSessionWithPreset:AVCaptureSessionPresetLow error:&error])
{
[self setCaptureManager:captureManager];
AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:[captureManager session]];
self.captureVideoPreviewLayer= previewLayer;
UIView *view = [self cameraView];
CALayer *viewLayer = [view layer];
[viewLayer setMasksToBounds:YES];
CGRect bounds = [view bounds];
[captureVideoPreviewLayer setFrame:bounds];
if ([captureVideoPreviewLayer isOrientationSupported])
[captureVideoPreviewLayer setOrientation:AVCaptureVideoOrientationPortrait];
[captureVideoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[[captureManager session] startRunning];
[self setCaptureVideoPreviewLayer:captureVideoPreviewLayer];
if ([[captureManager session] isRunning])
{
[captureManager setOrientation:AVCaptureVideoOrientationPortrait];
[captureManager setDelegate:self];
[viewLayer insertSublayer:captureVideoPreviewLayer below:[[viewLayer sublayers] objectAtIndex:0]];
NSString *countString = [[NSString alloc] initWithFormat:@"%d", [[AVCaptureDevice devices] count]];
NSLog(@"Device count: %@",countString);
} else {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Failure"
message:@"Failed to start session."
delegate:nil
cancelButtonTitle:@"Okay"
otherButtonTitles:nil];
[alertView show];
[alertView release];
}
} else {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Input Device Init Failed"
message:[error localizedDescription]
delegate:nil
cancelButtonTitle:@"Okay"
otherButtonTitles:nil];
[alertView show];
[alertView release];
}
[captureManager release];
if (![[self captureManager] isRecording]) {
[[self captureManager] startRecording];
}
其中,当我使用apple AVCam示例代码中的“AVCamCaptureManager”时。首先,将电影播放器设置为使用应用程序音频会话:
moviePlayer.useApplicationAudioSession=YES;
然后,在调用[[captureManager session]startRunning]之前,激活音频会话,将其类别设置为“播放和录制”,并覆盖其属性以允许其与其他会话混合
// Set audio session category to "play and record"
NSError* error = nil;
AVAudioSession* audioSession = [AVAudioSession sharedInstance];
if (![audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&error]) {
NSLog(@"AVAudioSession setCategory failed: %@", [error 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
error = nil;
if (![audioSession setActive:YES error:&error]) {
NSLog(@"AVAudioSession setActive:YES failed: %@", [error localizedDescription]);
}
如果有人想知道。。。Wertesse提出的上述方法也适用于我,但它也适用于AVPlayer(它没有useApplicationAudioSession属性)。嘿,Bernt,关于如何实现这一点,还有其他见解吗?我在viewDidLoad函数中有效地复制了原始问题中的代码,并添加了AudioSession配置。但是,我的CaptureSession仍在停止。代码示例将不胜感激。谢谢这很有趣,因为它与这里公认的答案相矛盾:即在捕获会话之后启动音频会话。实际上,文档中说的是关于
useApplicationAudioSession
:“一个布尔值,指示电影播放器是否应使用应用程序的音频会话。(在iOS 6.0中已弃用。此属性没有替换项,不鼓励使用。)“默认值已为YES
。