我正在制作一个应用程序,允许用户实时录制视频,同时在预览图层中显示一些HUD信息。
我已经解决了很多问题,但我遇到的一个问题是,当iPad处于横向模式时,视频本身会向右旋转90度。当主页按钮位于左侧时,视频将逆时针旋转90度,而当主页按钮位于右侧时,视频会旋转90度。无论我使用哪种横向模式,视频都应该是直立的。这个[SO消息]似乎与我正在处理的内容非常接近,但解决方案包含了弃用。 1
在我的主控制器中:
[self setCaptureManager:[[[CaptureSessionManager alloc] init] autorelease]];
[[self captureManager] addVideoInput];
[[self captureManager] addVideoPreviewLayer];
CGRect layerRect = [[[self view] layer] bounds];
[[[self captureManager] previewLayer] setBounds:layerRect];
[[[self captureManager] previewLayer] setPosition:CGPointMake(CGRectGetMidX(layerRect),
CGRectGetMidY(layerRect))];
[[[self view] layer] addSublayer:[[self captureManager] previewLayer]];
CaptureSessionManager.h
#import <CoreMedia/CoreMedia.h>
#import <AVFoundation/AVFoundation.h>
@interface CaptureSessionManager : NSObject {
}
@property(retain) AVCaptureVideoPreviewLayer *previewLayer;
@property(retain) AVCaptureSession *captureSession;
- (void)addVideoPreviewLayer;
- (void)addVideoInput;
@end
CaptureSessionManager.m
#import "CaptureSessionManager.h"
@implementation CaptureSessionManager
@synthesize captureSession;
@synthesize previewLayer;
#pragma mark Capture Session Configuration
- (id)init {
if ((self = [super init])) {
[self setCaptureSession:[[AVCaptureSession alloc] init]];
if ([captureSession canSetSessionPreset:AVCaptureSessionPresetHigh]) {
captureSession.sessionPreset = AVCaptureSessionPresetHigh;
}
}
return self;
}
- (void)addVideoPreviewLayer {
[self setPreviewLayer:[[[AVCaptureVideoPreviewLayer alloc] initWithSession:[self captureSession]] autorelease]];
[[self previewLayer] setVideoGravity:AVLayerVideoGravityResizeAspectFill];
}
- (void)addVideoInput {
AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if (videoDevice) {
NSError *error;
AVCaptureDeviceInput *videoIn = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error];
if (!error) {
if ([[self captureSession] canAddInput:videoIn])
[[self captureSession] addInput:videoIn];
else
NSLog(@"Couldn't add video input");
}
else
NSLog(@"Couldn't create video input");
}
else
NSLog(@"Couldn't create video capture device");
}
- (void)dealloc {
[[self captureSession] stopRunning];
[previewLayer release], previewLayer = nil;
[captureSession release], captureSession = nil;
[super dealloc];
}
@end
答案 0 :(得分:1)
如果您提到的那个问题的答案不起作用,那么您可以通过其他方式实现。使用CATransform3DMakeRotation
根据设备的方向旋转预览图层。
例如,对于UIDeviceOrientationLandscapeLeft
,您可以像这样旋转预览图层:
preview.transform = CATransform3DMakeRotation(-M_PI/2, 0, 0, 1);
答案 1 :(得分:1)
发现需要设置预览图层连接的videoOrientation属性。
以下是我的addVideoPreviewLayer方法的更改......
- (void)addVideoPreviewLayer {
[self setPreviewLayer:[[[AVCaptureVideoPreviewLayer alloc] initWithSession:[self captureSession]] autorelease]];
[[self previewLayer] setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[[previewLayer connection] setVideoOrientation:AVCaptureVideoOrientationLandscapeRight];
}