1.引入头文件
#import <AVFoundation/AVFoundation.h>
代理 <AVCaptureVideoDataOutputSampleBufferDelegate>
2.新建属性
@property(strong,nonatomic)AVCaptureSession*captureSession;//数据传递
@property(strong,nonatomic)AVCaptureDeviceInput*captureDeviceInput;//输入数据
@property(strong,nonatomic)AVCaptureVideoDataOutput*captureVideoDataOutput;//视频输出
@property(strong,nonatomic)AVCaptureVideoPreviewLayer*captureVideoPreviewLayer;//相机拍摄预览图层 连接一个view.layer显示
3.初始化配置
//(1)初始化Session
_captureSession= [[AVCaptureSessionalloc]init];
if([_captureSessioncanSetSessionPreset:AVCaptureSessionPreset1280x720]) {
_captureSession.sessionPreset=AVCaptureSessionPreset1280x720;
}
//(2)初始化输入取得后置摄像头ios10之前
AVCaptureDevice*captureDevice = [selfgetCameraDeviceWithPosition:AVCaptureDevicePositionBack];
if(!captureDevice) {
NSLog(@"取得后置摄像头时出现问题.");
return;
}
/*
-(AVCaptureDevice*)getCameraDeviceWithPosition:(AVCaptureDevicePosition)position{
NSArray*cameras= [AVCaptureDevicedevicesWithMediaType:AVMediaTypeVideo];
for(AVCaptureDevice*cameraincameras) {
if([cameraposition]==position) {
returncamera;
}
}
returnnil;
}
*/
//根据输入设备初始化设备输入对象，用于获得输入数据
NSError*error=nil;
_captureDeviceInput= [[AVCaptureDeviceInputalloc]initWithDevice:captureDeviceerror:&error];
if(error) {
NSLog(@"取得设备输入对象时出错，错误原因：%@",error.localizedDescription);
return;
}
if([_captureSessioncanAddInput:_captureDeviceInput]) {
[_captureSessionaddInput:_captureDeviceInput];
}
//(3)初始化输出
_captureVideoDataOutput= [[AVCaptureVideoDataOutputalloc]init];
if([_captureSessioncanAddOutput:_captureVideoDataOutput]) {
[_captureSessionaddOutput:_captureVideoDataOutput];
//指定代理 增加并行线程
dispatch_queue_tqueue =dispatch_queue_create("myQueue",DISPATCH_QUEUE_CONCURRENT);
[_captureVideoDataOutputsetSampleBufferDelegate:selfqueue:queue];
_captureVideoDataOutput.videoSettings=
[NSDictionarydictionaryWithObject:
[NSNumbernumberWithInt:kCVPixelFormatType_32BGRA]
forKey:(id)kCVPixelBufferPixelFormatTypeKey];
AVCaptureConnection*captureConnection = [_captureVideoDataOutputconnectionWithMediaType:AVMediaTypeVideo];
NSError*error;
CMTimeframeDuration =CMTimeMake(1,15);//指定帧数
NSArray*supportedFrameRateRanges = [captureDevice.activeFormatvideoSupportedFrameRateRanges];
BOOLframeRateSupported =NO;
for(AVFrameRateRange*rangeinsupportedFrameRateRanges) {
if(CMTIME_COMPARE_INLINE(frameDuration, >=, range.minFrameDuration) &&
CMTIME_COMPARE_INLINE(frameDuration, <=, range.maxFrameDuration)) {
frameRateSupported =YES;
}
}
if(frameRateSupported && [captureDevicelockForConfiguration:&error]) {
[captureDevicesetActiveVideoMaxFrameDuration:frameDuration];
[captureDevicesetActiveVideoMinFrameDuration:frameDuration];
[captureDeviceunlockForConfiguration];
}
//防抖
if([captureConnectionisVideoStabilizationSupported]) {
captureConnection.preferredVideoStabilizationMode=AVCaptureVideoStabilizationModeAuto;
}
}
// (4)初始化显示界面
_captureVideoPreviewLayer= [[AVCaptureVideoPreviewLayeralloc]initWithSession:self.captureSession];
CALayer*layer =self.showView.layer;
layer.masksToBounds=YES;
_captureVideoPreviewLayer.frame=layer.bounds;
_captureVideoPreviewLayer.videoGravity=AVLayerVideoGravityResizeAspect;
[layeraddSublayer:_captureVideoPreviewLayer];
/*
//更新界面布局
- (void)viewDidLayoutSubviews{
CALayer*layer =self.showView.layer;
_captureVideoPreviewLayer.frame=layer.bounds;
}
*/
4.代理处理数据
- (void)captureOutput:(AVCaptureOutput*)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection*)connection
{
CVImageBufferRefimageBuffer =CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer,0);
uint8_t*baseAddress = (uint8_t*)CVPixelBufferGetBaseAddress(imageBuffer);
size_tbytesPerRow =CVPixelBufferGetBytesPerRow(imageBuffer);
size_twidth =CVPixelBufferGetWidth(imageBuffer);
size_theight =CVPixelBufferGetHeight(imageBuffer);
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
CGColorSpaceRefcolorSpace =CGColorSpaceCreateDeviceRGB();
CGContextRefnewContext =CGBitmapContextCreate(baseAddress, width, height,8, bytesPerRow, colorSpace,kCGBitmapByteOrder32Little|kCGImageAlphaPremultipliedFirst);
CGImageRefnewImage =CGBitmapContextCreateImage(newContext);
UIImage*image= [UIImageimageWithCGImage:newImagescale:1.0orientation:UIImageOrientationRight];//当前的图像
//人脸检测
CIDetector*faceDetector = [CIDetectordetectorOfType:CIDetectorTypeFacecontext:niloptions:@{CIDetectorAccuracy:CIDetectorAccuracyLow}];
NSArray*features = [faceDetectorfeaturesInImage:[CIImageimageWithCGImage:image.CGImage]options:@{CIDetectorImageOrientation:[NSNumbernumberWithInt:6]}];
CIFaceFeature*feature = [featuresfirstObject];
if(feature) {
CGFloatx =0;
CGFloaty =0;
CGFloatx1 =0;
CGFloaty1 =0;
CGFloathwidth =40;
CGFloathheight =40;
CGFloatoffSetY =0;
CGFloatoffSetX =0;
CGFloatoffSetHeight =0;
if(feature.hasLeftEyePosition){
CGPointleftEyePos = feature.leftEyePosition;
NSLog(@"leftX = %f leftY = %f",leftEyePos.x,leftEyePos.y);
x1 = leftEyePos.x;
y1 = leftEyePos.y;
}
if(feature.hasRightEyePosition){
CGPointrightEyePos = feature.rightEyePosition;
NSLog(@"rightX = %f rightY = %f",rightEyePos.x,rightEyePos.y);
x = rightEyePos.x;
y = rightEyePos.y;
hheight = (y - y1);
}
if(feature.hasMouthPosition){
CGPointmouthPos = feature.mouthPosition;
NSLog(@"mouthX = %f mouthY = %f",mouthPos.x,mouthPos.y);
hwidth = mouthPos.x- x;
offSetHeight = hheight/4.0;
offSetY = offSetHeight;
offSetX = hwidth/2.0;
}
CGRectrect =CGRectMake(x, image.size.width- y, hwidth, hheight);
CGImageRefsubImageRef =CGImageCreateWithImageInRect(image.CGImage, rect);
UIImage*smallImage= [UIImageimageWithCGImage:subImageRefscale:1.0orientation:UIImageOrientationRight];//获取到的脸部图像
dispatch_async(dispatch_get_main_queue(), ^{
self.headImage.image= smallImage;
self.yuanImage.image= image;
});
CGImageRelease(subImageRef);
}
CGContextRelease(newContext);
CGColorSpaceRelease(colorSpace);
CGImageRelease(newImage);
}
