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 {@privateint mWidth;int mHeight;int mFps;BOOL mFrontCamera;BOOL mFirstFrame;BOOL mStarted;UIView* mPreview;id<CameraHelpDelegate> outDelegate;#if PRODUCER_HAS_VIDEO_CAPTUREAVCaptureSession* 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。。。。