ios GPUImage简单滤镜 -- 录制视频（保存＋聚焦）

最近初学ios以及研究GUPImage第三方库，在度娘及google上查了不少的资料后，勉强写了一个小程序，分享给大家。代码中肯定有不足之处（毕竟初学者），望大家指教！

在写代码之前，要先引入GPUImage库。可以用自已动手引入或直接用cocoapods（  度娘及官网有教程，不懂的请自行搜索 － －）。

下面是代码：

VideoCameraView.h

#import <UIKit/UIKit.h>
#import "GPUImage.h"

@interface VideoCameraView : UIView

{
GPUImageVideoCamera *videoCamera;
GPUImageOutput<GPUImageInput> *filter;
GPUImageMovieWriter *movieWriter;
NSString *pathToMovie;
GPUImageView *filteredVideoView;
CALayer *_focusLayer;
NSTimer *myTimer;
UILabel *timeLabel;
NSDate *fromdate;
CGRect mainScreenFrame;
}

- (instancetype)initWithFrame:(CGRect)frame NS_DESIGNATED_INITIALIZER;

@end

VideoCameraView.m

#import "VideoCameraView.h"
@interface VideoCameraView ()

@end

@implementation VideoCameraView
- (instancetype) initWithFrame:(CGRect)frame{
if (!(self = [super initWithFrame:frame]))
{
return nil;
}
mainScreenFrame = frame;
videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPreset1280x720 cameraPosition:AVCaptureDevicePositionBack];
videoCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
[videoCamera addAudioInputsAndOutputs];
filter = [[GPUImageSaturationFilter alloc] init];
filteredVideoView = [[GPUImageView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[videoCamera addTarget:filter];

[filter addTarget:filteredVideoView];
[videoCamera startCameraCapture];
[self addSomeView];
UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(cameraViewTapAction:)];
singleFingerOne.numberOfTouchesRequired = 1; //手指数
singleFingerOne.numberOfTapsRequired = 1; //tap次数
[filteredVideoView addGestureRecognizer:singleFingerOne];
[self addSubview:filteredVideoView];
return self;

}

- (void) addSomeView{
UISlider *filterSettingsSlider = [[UISlider alloc] initWithFrame:CGRectMake(25.0, 30.0, mainScreenFrame.size.width - 50.0, 40.0)];
[filterSettingsSlider addTarget:self action:@selector(updateSliderValue:) forControlEvents:UIControlEventValueChanged];
filterSettingsSlider.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
filterSettingsSlider.minimumValue = 0.0;
filterSettingsSlider.maximumValue = 2.0;
filterSettingsSlider.value = 1.0;
[filteredVideoView addSubview:filterSettingsSlider];

timeLabel = [[UILabel alloc] initWithFrame:CGRectMake(20.0, 60.0, 100, 30.0)];
timeLabel.font = [UIFont systemFontOfSize:15.0f];
timeLabel.text = @"00:00:00";
timeLabel.textAlignment = NSTextAlignmentCenter;
timeLabel.backgroundColor = [UIColor clearColor];
timeLabel.textColor = [UIColor whiteColor];
[filteredVideoView addSubview:timeLabel];

UIButton *photoCaptureButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[photoCaptureButton.layer setCornerRadius:8];
photoCaptureButton.frame = CGRectMake(50, mainScreenFrame.size.height - 70.0, 50.0, 40.0);
photoCaptureButton.backgroundColor = [UIColor whiteColor];
[photoCaptureButton setTitle:@"开始" forState:UIControlStateNormal];
photoCaptureButton.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
[photoCaptureButton addTarget:self action:@selector(startRecording:) forControlEvents:UIControlEventTouchUpInside];
[photoCaptureButton setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];

[filteredVideoView addSubview:photoCaptureButton];
UIButton *cameraChangeButton  = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[cameraChangeButton.layer setCornerRadius:8];
cameraChangeButton.frame = CGRectMake(mainScreenFrame.size.width - 150, mainScreenFrame.size.height - 70.0, 100.0, 40.0);
cameraChangeButton.backgroundColor = [UIColor whiteColor];
[cameraChangeButton setTitle:@"录制结束" forState:UIControlStateNormal];
cameraChangeButton.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
[cameraChangeButton addTarget:self action:@selector(stopRecording:) forControlEvents:UIControlEventTouchUpInside];
[cameraChangeButton setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];
[filteredVideoView addSubview:cameraChangeButton];

}

- (IBAction)updateSliderValue:(id)sender

{
[(GPUImageSaturationFilter *)filter setSaturation:[(UISlider *)sender value]];
}

- (IBAction)stopRecording:(id)sender {
//[filter removeTarget:movieWriter];
videoCamera.audioEncodingTarget = nil;
NSLog(@"Path %@",pathToMovie);
UISaveVideoAtPathToSavedPhotosAlbum(pathToMovie, nil, nil, nil);
[movieWriter finishRecording];
[filter removeTarget:movieWriter];
timeLabel.text = @"00:00:00";
[myTimer invalidate];
myTimer = nil;
//[movieWriter cancelRecording];

}

- (IBAction)startRecording:(id)sender {
pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.m4v"];
unlink([pathToMovie UTF8String]); // If a file already exists, AVAssetWriter won't let you record new frames, so delete the old movie
NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];
movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(360.0, 640.0)];
movieWriter.encodingLiveVideo = YES;
movieWriter.shouldPassthroughAudio = YES;
[filter addTarget:movieWriter];
videoCamera.audioEncodingTarget = movieWriter;
[movieWriter startRecording];
NSTimeInterval timeInterval =1.0;
fromdate = [NSDate date];
myTimer = [NSTimer scheduledTimerWithTimeInterval:timeInterval
target:self
selector:@selector(updateTimer:)
userInfo:nil
repeats:YES];

}

- (void)updateTimer:(NSTimer *)sender{
NSDateFormatter *dateFormator = [[NSDateFormatter alloc] init];
dateFormator.dateFormat = @"HH:mm:ss";
NSDate *todate = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit |
NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *comps  = [calendar components:unitFlags fromDate:fromdate toDate:todate options:NSCalendarWrapComponents];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDate *timer = [gregorian dateFromComponents:comps];
NSString *date = [dateFormator stringFromDate:timer];
timeLabel.text = date;
}

- (void)setfocusImage{
UIImage *focusImage = [UIImage imageNamed:@"96"];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, focusImage.size.width, focusImage.size.height)];
imageView.image = focusImage;
CALayer *layer = imageView.layer;
layer.hidden = YES;
[filteredVideoView.layer addSublayer:layer];
_focusLayer = layer;
}

- (void)layerAnimationWithPoint:(CGPoint)point {
if (_focusLayer) {
CALayer *focusLayer = _focusLayer;
focusLayer.hidden = NO;
[CATransaction begin];
[CATransaction setDisableActions:YES];
[focusLayer setPosition:point];
focusLayer.transform = CATransform3
ae99
DMakeScale(2.0f,2.0f,1.0f);
[CATransaction commit];
CABasicAnimation *animation = [ CABasicAnimation animationWithKeyPath: @"transform" ];
animation.toValue = [ NSValue valueWithCATransform3D: CATransform3DMakeScale(1.0f,1.0f,1.0f)];
animation.delegate = self;
animation.duration = 0.3f;
animation.repeatCount = 1;
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
[focusLayer addAnimation: animation forKey:@"animation"];
// 0.5秒钟延时
[self performSelector:@selector(focusLayerNormal) withObject:self afterDelay:0.5f];
}
}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {

}

- (void)focusLayerNormal {

filteredVideoView.userInteractionEnabled = YES;

_focusLayer.hidden = YES;

}

-(void)cameraViewTapAction:(UITapGestureRecognizer *)tgr
{
if (tgr.state == UIGestureRecognizerStateRecognized && (_focusLayer == NO || _focusLayer.hidden)) {
CGPoint location = [tgr locationInView:filteredVideoView];
[self setfocusImage];
[self layerAnimationWithPoint:location];
AVCaptureDevice *device = videoCamera.inputCamera;
CGPoint pointOfInterest = CGPointMake(0.5f, 0.5f);
NSLog(@"taplocation x = %f y = %f", location.x, location.y);
CGSize frameSize = [filteredVideoView frame].size;
if ([videoCamera cameraPosition] == AVCaptureDevicePositionFront) {
location.x = frameSize.width - location.x;

}
pointOfInterest = CGPointMake(location.y / frameSize.height, 1.f - (location.x / frameSize.width));
if ([device isFocusPointOfInterestSupported] && [device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
NSError *error;

if ([device lockForConfiguration:&error]) {
[device setFocusPointOfInterest:pointOfInterest];

[device setFocusMode:AVCaptureFocusModeAutoFocus];
if([device isExposurePointOfInterestSupported] && [device isExposureModeSupported:AVCaptureExposureModeContinuousAutoExposure])

{

[device setExposurePointOfInterest:pointOfInterest];

[device setExposureMode:AVCaptureExposureModeContinuousAutoExposure];

}
[device unlockForConfiguration];
NSLog(@"FOCUS OK");
} else {

NSLog(@"ERROR = %@", error);
}
}
}
}
@end

将以上两个文件放入你的工程后，只需在viewDidLoad函数中加入一下代码，就可以运行了（记得引入头文件～）

CGRect frame = [[UIScreen mainScreen] bounds];
VideoCameraView *view = [[VideoCameraView alloc] initWithFrame:frame];
[self.view addSubview:view];

程序下载地址：http://download.csdn.net/detail/u012965341/9484245