iPhone摄像头设备获取(分离简化版）

目的：打开、关闭前置摄像头，绘制图像，并获取摄像头的二进制数据。需要的库AVFoundation.framework 、CoreVideo.framework 、CoreMedia.framework 、QuartzCore.framework该摄像头捕抓必须编译真机的版本，模拟器下编译不了。函数说明- ( void )createControl{ // UI界面控件的创建 }- (AVCaptureDevice * )getFrontCamera;获取前置摄像头设备- ( void )startVideoCapture;打开摄像头并开始捕捉图像其中代码：AVCaptureVideoPreviewLayer* previewLayer = [AVCaptureVideoPreviewLayer layerWithSession: self-> avCaptureSession];previewLayer.frame = localView.bounds;previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;[self-> localView.layer addSublayer: previewLayer]; 为把图片画到UIView里面- ( void)stopVideoCapture:( id )arg；关闭摄像头，停止捕抓图像其中代码： for(UIView*viewinself-> localView.subviews) {[viewremoveFromSuperview];}为移除摄像头图像的View详情见代码，代码拷过去可以直接使用 Over!!!! 代码：头文件： // // AVCallController.h // Pxlinstall // // Created by Lin Charlie C. on 11-3-24. // Copyright 2011 xxxx. All rights reserved. // #import <UIKit/UIKit.h> #import <AVFoundation/AVFoundation.h> @interface AVCallController : UIViewController <AVCaptureVideoDataOutputSampleBufferDelegate> { // UIUILabel* labelState;UIButton* btnStartVideo;UIView* localView;AVCaptureSession* avCaptureSession;AVCaptureDevice * avCaptureDevice;BOOLfirstFrame; // 是否为第一帧 intproducerFps;}@property (nonatomic, retain) AVCaptureSession * avCaptureSession;@property (nonatomic, retain) UILabel * labelState;- ( void )createControl;- (AVCaptureDevice * )getFrontCamera;- ( void )startVideoCapture;- ( void)stopVideoCapture:( id )arg; @end //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// / //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// / //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// / 实现文件： // // AVCallController.m // Pxlinstall // // Created by Lin Charlie C. on 11-3-24. // Copyright 2011 高鸿移通. All rights reserved. // #import " AVCallController.h " @implementation AVCallController @synthesize avCaptureSession; @synthesize labelState; // The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad. /* - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization. } return self;} */-( id )init{ if(self= [superinit]){firstFrame= YES;producerFps= 50 ;}returnself;} // Implement loadView to create a view hierarchy programmatically, without using a nib.- ( void )loadView {[superloadView];[selfcreateControl];} /* // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.- (void)viewDidLoad { [super viewDidLoad];} */ /* // Override to allow orientations other than the default portrait orientation.- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations. return (interfaceOrientation == UIInterfaceOrientationPortrait);} */- ( void )didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [superdidReceiveMemoryWarning]; // Release any cached data, images, etc. that aren't in use. }- ( void )viewDidUnload {[superviewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; }- ( void )dealloc { [super dealloc];} #pragma mark - #pragma mark createControl- ( void )createControl{ // UI展示self.view.backgroundColor= [UIColorgrayColor];labelState= [[UILabelalloc] initWithFrame:CGRectMake( 10, 20, 220, 30 )];labelState.backgroundColor= [UIColorclearColor];[self.viewaddSubview:labelState];[labelStaterelease];btnStartVideo= [[UIButtonalloc] initWithFrame:CGRectMake( 20, 350, 80, 50 )];[btnStartVideosetTitle: @" Star " forState:UIControlStateNormal];[btnStartVideosetBackgroundImage:[UIImageimageNamed: @" Images/button.png " ] forState:UIControlStateNormal];[btnStartVideoaddTarget:selfaction:@selector(startVideoCapture) forControlEvents:UIControlEventTouchUpInside];[self.viewaddSubview:btnStartVideo];[btnStartVideorelease];UIButton* stop = [[UIButtonalloc] initWithFrame:CGRectMake( 120, 350, 80, 50 )];[stop setTitle: @" Stop " forState:UIControlStateNormal];[stop setBackgroundImage:[UIImageimageNamed: @" Images/button.png " ] forState:UIControlStateNormal];[stop addTarget:selfaction:@selector(stopVideoCapture:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:stop];[stop release];localView= [[UIViewalloc] initWithFrame:CGRectMake( 40, 50, 200, 300 )];[self.viewaddSubview:localView];[localViewrelease];} #pragma mark - #pragma mark VideoCapture- (AVCaptureDevice * )getFrontCamera{ // 获取前置摄像头设备NSArray *cameras = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; for (AVCaptureDevice *device in cameras){ if (device.position == AVCaptureDevicePositionFront) return device; } return [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];}- ( void )startVideoCapture{ // 打开摄像设备，并开始捕抓图像[labelStatesetText: @" Starting Video stream " ]; if(self->avCaptureDevice|| self-> avCaptureSession){[labelStatesetText: @" Already capturing " ]; return ;} if((self->avCaptureDevice = [self getFrontCamera]) == nil){[labelStatesetText: @" Failed to get valide capture device " ]; return ;}NSError *error = nil; AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:self->avCaptureDevice error:& error]; if (! videoInput){[labelStatesetText: @" Failed to get video input " ];self->avCaptureDevice= nil; return ; } self->avCaptureSession = [[AVCaptureSession alloc] init]; self->avCaptureSession.sessionPreset = AVCaptureSessionPresetLow; [self-> avCaptureSession addInput:videoInput]; // Currently, the only supported key is kCVPixelBufferPixelFormatTypeKey. Recommended pixel format choices are // kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange or kCVPixelFormatType_32BGRA. // On iPhone 3G, the recommended pixel format choices are kCVPixelFormatType_422YpCbCr8 or kCVPixelFormatType_32BGRA. // AVCaptureVideoDataOutput *avCaptureVideoDataOutput = [[AVCaptureVideoDataOutput alloc] init];NSDictionary*settings = [[NSDictionaryalloc] initWithObjectsAndKeys: // [NSNumber numberWithUnsignedInt:kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange], kCVPixelBufferPixelFormatTypeKey,[NSNumbernumberWithInt: 240], ( id )kCVPixelBufferWidthKey, [NSNumber numberWithInt: 320], ( id )kCVPixelBufferHeightKey, nil]; avCaptureVideoDataOutput.videoSettings = settings; [settings release]; avCaptureVideoDataOutput.minFrameDuration = CMTimeMake( 1, self-> producerFps); /* We create a serial queue to handle the processing of our frames */ dispatch_queue_tqueue = dispatch_queue_create( " org.doubango.idoubs " , NULL); [avCaptureVideoDataOutput setSampleBufferDelegate:self queue:queue]; [self-> avCaptureSession addOutput:avCaptureVideoDataOutput]; [avCaptureVideoDataOutput release];dispatch_release(queue);AVCaptureVideoPreviewLayer* previewLayer = [AVCaptureVideoPreviewLayer layerWithSession: self-> avCaptureSession];previewLayer.frame = localView.bounds;previewLayer.videoGravity= AVLayerVideoGravityResizeAspectFill;[self-> localView.layer addSublayer: previewLayer];self->firstFrame= YES; [self-> avCaptureSession startRunning];[labelStatesetText: @" Video capture started " ];}- ( void)stopVideoCapture:( id )arg{ // 停止摄像头捕抓 if(self-> avCaptureSession){[self-> avCaptureSession stopRunning];self->avCaptureSession= nil;[labelStatesetText: @" Video capture stopped " ];}self->avCaptureDevice= nil; // 移除localView里面的内容 for(UIView*viewinself-> localView.subviews) {[viewremoveFromSuperview];}} #pragma mark - #pragma mark AVCaptureVideoDataOutputSampleBufferDelegate- ( void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection * )connection { // 捕捉数据输出 要怎么处理虽你便CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); /* Lock the buffer */ if(CVPixelBufferLockBaseAddress(pixelBuffer, 0) == kCVReturnSuccess){ UInt8 *bufferPtr = (UInt8 * )CVPixelBufferGetBaseAddress(pixelBuffer); size_t buffeSize = CVPixelBufferGetDataSize(pixelBuffer); if(self-> firstFrame){ if( 1 ){ // 第一次数据要求：宽高，类型 int width = CVPixelBufferGetWidth(pixelBuffer); int height = CVPixelBufferGetHeight(pixelBuffer); int pixelFormat = CVPixelBufferGetPixelFormatType(pixelBuffer); switch (pixelFormat) {casekCVPixelFormatType_420YpCbCr8BiPlanarVideoRange: // TMEDIA_PRODUCER(producer)->video.chroma = tmedia_nv12; // iPhone 3GS or 4NSLog( @" Capture pixel format=NV12 " ); break ;casekCVPixelFormatType_422YpCbCr8: // TMEDIA_PRODUCER(producer)->video.chroma = tmedia_uyvy422; // iPhone 3NSLog( @" Capture pixel format=UYUY422 " ); break ; default : // TMEDIA_PRODUCER(producer)->video.chroma = tmedia_rgb32;NSLog( @" Capture pixel format=RGB32 " ); break ;}self->firstFrame = NO;}} /* We unlock the buffer */ CVPixelBufferUnlockBaseAddress(pixelBuffer, 0 ); } /* We create an autorelease pool because as we are not in the main_queue our code is not executed in the main thread. So we have to create an autorelease pool for the thread we are in */ // NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; // // CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); // /*Lock the image buffer*/ // CVPixelBufferLockBaseAddress(imageBuffer,0); // /*Get information about the image*/ // uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer); // size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); // size_t width = CVPixelBufferGetWidth(imageBuffer); // size_t height = CVPixelBufferGetHeight(imageBuffer); // // /*Create a CGImageRef from the CVImageBufferRef*/ // CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); // CGContextRef newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst); // CGImageRef newImage = CGBitmapContextCreateImage(newContext); // // /*We release some components*/ // CGContextRelease(newContext); // CGColorSpaceRelease(colorSpace); // // /*We display the result on the custom layer. All the display stuff must be done in the main thread because // UIKit is no thread safe, and as we are not in the main thread (remember we didn't use the main_queue) // we use performSelectorOnMainThread to call our CALayer and tell it to display the CGImage.*/ // [self.customLayer performSelectorOnMainThread:@selector(setContents:) withObject: (id) newImage waitUntilDone:YES]; // // /*We display the result on the image view (We need to change the orientation of the image so that the video is displayed correctly). // Same thing as for the CALayer we are not in the main thread so ...*/ // UIImage *image= [UIImage imageWithCGImage:newImage scale:1.0 orientation:UIImageOrientationRight]; // // /*We relase the CGImageRef*/ // CGImageRelease(newImage); // // [self.imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:YES]; // // /*We unlock the image buffer*/ // CVPixelBufferUnlockBaseAddress(imageBuffer,0); // // [pool drain]; } @end

简化版:

这次把视频捕获的彻底的分出来了。应该每个都看得懂怎么用吧。
贴上代码略说明下
需要的库
AVFoundation.framework 、CoreVideo.framework 、CoreMedia.framework
该摄像头捕抓必须编译真机的版本且要sdk4.0以上，模拟器下编译不了。
[font=]文件说明：
[font=] CameraHelp.h/.m 为主要文件即摄像头捕获
[font=] VideoController.h/.m为调用示例

//
//  CameraHelp.h
//  
//
//  Created by Zhuang Chuan Xian. on 11-6-28.
//  Copyright 2011  . All rights reserved.
//
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>


#undef PRODUCER_HAS_VIDEO_CAPTURE
#define PRODUCER_HAS_VIDEO_CAPTURE (__IPHONE_OS_VERSION_MIN_REQUIRED >= 40000 && TARGET_OS_EMBEDDED)
@protocol CameraHelpDelegate
-(void)VideoDataOutputBuffer:(char*)videoBuffer dataSize:(int)size;
@end


@interface CameraHelp : NSObject
#if PRODUCER_HAS_VIDEO_CAPTURE
<AVCaptureVideoDataOutputSampleBufferDelegate>
#endif 
{
@private
int mWidth;
int mHeight;
int mFps;
BOOL mFrontCamera;
BOOL mFirstFrame;
BOOL mStarted;
UIView* mPreview;
id<CameraHelpDelegate> outDelegate;
#if PRODUCER_HAS_VIDEO_CAPTURE
AVCaptureSession* mCaptureSession;
AVCaptureDevice *mCaptureDevice;
#endif
}
//单例模式
+ (CameraHelp*)shareCameraHelp;
+ (void)closeCamera;
//设置前置摄像头
- (BOOL)setFrontCamera;
//设置后置摄像头
- (BOOL)setBackCamera;
//开始前设置捕获参数
- (void)prepareVideoCapture:(int) width andHeight: (int)height andFps: (int) fps andFrontCamera:(BOOL) bfront andPreview:(UIView*) view;
//开始捕获
- (void)startVideoCapture;
//停止捕获
- (void)stopVideoCapture;
//设置要显示到得View
- (void)setPreview: (UIView*)preview;
//设置数据输出
- (void)setVideoDataOutputBuffer:(id<CameraHelpDelegate>)delegate;
@end


实现的自己下载例子，该例可以在编译运行，函数不懂的看这  iPhone摄像头设备获取


下面是调用说明很简单就句话
//
//  VideoController.m
//  
//
//  Created by zcx. on 11-6-28.
//  Copyright 2011  . All rights reserved.
//


#import "VideoController.h"
#import "CameraHelp.h"


@implementation VideoController
@synthesize videoView;
// The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
// Custom initialization.
self.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
self.modalPresentationStyle = UIModalPresentationFullScreen;
    }
return self;
}






// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
[self setTitle:@"Video Capture"];
//捕获很简单就下面这几句话
//设置输出的View
[[CameraHelp shareCameraHelp] setPreview:videoView];
//捕获数据输出到本地
[[CameraHelp shareCameraHelp] setVideoDataOutputBuffer:self];
//开始捕获
[[CameraHelp shareCameraHelp] startVideoCapture];
}
//如果要获取捕获的数据记得重写这个接口哦 不然蹦了，不要怪人哦。
-(void)VideoDataOutputBuffer:(char*)videoBuffer dataSize:(int)size
{
NSLog(@"Recv Data size=%d",size);
}


/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/


- (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];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}




- (void)dealloc {
//停止捕获
[[CameraHelp shareCameraHelp] stopVideoCapture];
//关闭输出
[[CameraHelp shareCameraHelp] setVideoDataOutputBuffer:nil];
    [super dealloc];
}


- (IBAction) onButtonEndClick: (id)sender
{
[self dismissModalViewControllerAnimated:YES];
}
@end


最后程序关闭时记得调用 
[CameraHelp closeCamera];
不然会内存泄露的
最后 觉得好的话顶下哈。。。。