我正在开发一个 iOS 应用程序，它使用后置摄像头录制视频。我已经设法让预览层正常工作。但是，如果我单击录制按钮，预览会冻结。
以下是我的代码。请帮我解决这个问题。
Pg5VideoViewController.h
@interface Pg5VideoViewController : UIViewController <AVCaptureVideoDataOutputSampleBufferDelegate,AVCaptureFileOutputRecordingDelegate> {
BOOL WeAreRecording;
IBOutlet UIView *videoViewBg;
AVCaptureSession *_captureSession;
UIImageView *_imageView;
CALayer *_customLayer;
AVCaptureVideoPreviewLayer *_prevLayer;
UIColor *pickedColor;
AVCaptureMovieFileOutput *movieFileOutput;
IBOutlet UIView *theColor;
}
@property (nonatomic,retain) IBOutlet UIView *theColor;
@property (nonatomic,retain) UIColor *pickedColor;
@property (nonatomic,retain) IBOutlet UIView *videoViewBg;
@property (nonatomic, retain) AVCaptureSession *captureSession;
@property (nonatomic, retain) UIImageView *imageView;
@property (nonatomic, retain) CALayer *customLayer;
@property (nonatomic, retain) AVCaptureVideoPreviewLayer *prevLayer;
@property (nonatomic, retain) AVCaptureMovieFileOutput *movieFileOutput;
-(void)initCapture;
-(UIColor *) colorOfPoint:(CGPoint)point;
-(IBAction)takeVideo:(id)sender;
@end
Pg5VideoViewController.m 文件：
@implementation Pg5VideoViewController
@synthesize videoViewBg;
@synthesize captureSession = _captureSession;
@synthesize imageView = _imageView;
@synthesize customLayer = _customLayer;
@synthesize prevLayer = _prevLayer;
@synthesize pickedColor = _pickedColor;
@synthesize theColor = _theColor;
@synthesize movieFileOutput = _movieFileOutput;
#pragma mark -
#pragma mark Initialization
- (id)init {
self = [super init];
if (self) {
self.imageView = nil;
self.prevLayer = nil;
self.customLayer = nil;
}
return self;
}
- (void)initCapture {
AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput
deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]
error:nil];
movieFileOutput = [[AVCaptureVideoDataOutput alloc] init];
dispatch_queue_t queue;
queue = dispatch_queue_create("cameraQueue", NULL);
[movieFileOutput setSampleBufferDelegate:self queue:queue];
dispatch_release(queue);
NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey;
NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];
NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key];
[movieFileOutput setVideoSettings:videoSettings];
self.captureSession = [[AVCaptureSession alloc] init];
[self.captureSession addInput:captureInput];
[self.captureSession addOutput:movieFileOutput];
[self.captureSession setSessionPreset:AVCaptureSessionPresetMedium];
self.customLayer = [CALayer layer];
self.customLayer.frame = CGRectMake(42, 40, 940, 558);
//self.customLayer.transform = CATransform3DRotate(CATransform3DIdentity, M_PI/2.0f, 0, 0, 1);
//self.customLayer.contentsGravity = kCAGravityResizeAspectFill;
[self.view.layer addSublayer:self.customLayer];
[self.captureSession startRunning];
}
#pragma mark -
#pragma mark AVCaptureSession delegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer,0);
uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
CGImageRef newImage = CGBitmapContextCreateImage(newContext);
CGContextRelease(newContext);
CGColorSpaceRelease(colorSpace);
[self.customLayer performSelectorOnMainThread:@selector(setContents:) withObject: (id) newImage waitUntilDone:YES];
UIImage *image= [UIImage imageWithCGImage:newImage scale:1.0 orientation:UIImageOrientationRight];
CGImageRelease(newImage);
[self.imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:YES];
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
[pool drain];
}
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
fromConnections:(NSArray *)connections
error:(NSError *)error
{
NSLog(@"didFinishRecordingToOutputFileAtURL - enter");
BOOL RecordedSuccessfully = YES;
if ([error code] != noErr)
{
id value = [[error userInfo] objectForKey:AVErrorRecordingSuccessfullyFinishedKey];
if (value)
{
RecordedSuccessfully = [value boolValue];
}
}
if (RecordedSuccessfully)
{
NSLog(@"didFinishRecordingToOutputFileAtURL - success");
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:outputFileURL])
{
[library writeVideoAtPathToSavedPhotosAlbum:outputFileURL
completionBlock:^(NSURL *assetURL, NSError *error)
{
if (error)
{
}
}];
}
[library release];
}
}
- (void)viewDidAppear:(BOOL)animated {
}
- (IBAction)takeVideo:(id)sender {
AVCaptureMovieFileOutput *movieFileOutput1 = [[AVCaptureMovieFileOutput alloc] init];
if(!WeAreRecording) {
NSLog(@"START RECORDING");
WeAreRecording = YES;
self.videoViewBg.backgroundColor = [UIColor redColor];
NSDateFormatter *formatter;
NSString *dateString;
formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"dd-MM-yyyy HH:mm:ss"];
dateString = [formatter stringFromDate:[NSDate date]];
[formatter release];
NSLog(@"The dateString is : %@",dateString);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
NSString *movieFileName = [NSString stringWithFormat: @"%@.mp4",dateString];
NSString *filePath = [documentsDirectoryPath stringByAppendingPathComponent:movieFileName];
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:filePath];
[self.captureSession stopRunning];
[self.captureSession beginConfiguration];
// [self.captureSession removeOutput:movieFileOutput];
if([self.captureSession canAddOutput:movieFileOutput1])
{
[self.captureSession addOutput:movieFileOutput1];
}
else
{
NSLog(@"Couldn't add still output");
}
[movieFileOutput1 startRecordingToOutputFileURL:outputURL recordingDelegate:self];
[self.captureSession commitConfiguration];
[self.captureSession startRunning];
[outputURL release];
} else {
NSLog(@"STOP RECORDING");
WeAreRecording = NO;
self.videoViewBg.backgroundColor = [UIColor whiteColor];
[movieFileOutput1 stopRecording];
[self.captureSession removeOutput:movieFileOutput1];
}
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint loc = [touch locationInView:self.view];
self.pickedColor = [self colorOfPoint:loc];
self.theColor.backgroundColor = self.pickedColor;
}
-(UIColor *) colorOfPoint:(CGPoint)point {
unsigned char pixel[4] = {0};
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, kCGImageAlphaPremultipliedLast);
CGContextTranslateCTM(context, -point.x, -point.y);
[self.view.layer renderInContext:context];
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
UIColor *color = [UIColor colorWithRed:pixel[0]/255.0 green:pixel[1]/255.0 blue:pixel[2]/255.0 alpha:pixel[3]/255.0];
return color;
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
[self initCapture];
WeAreRecording = NO;
self.videoViewBg.layer.cornerRadius = 55;
}
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
if(interfaceOrientation == UIInterfaceOrientationLandscapeRight) {
return YES;
}
return NO;
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
self.imageView = nil;
self.customLayer = nil;
self.prevLayer = nil;
[self.captureSession stopRunning];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[movieFileOutput release];
[self.captureSession release];
[super dealloc];
}
@结尾
请帮忙