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本篇文章給大家分享的是有關怎么在iOS中使用AVCaptureSession實現視頻錄制功能，小編覺得挺實用的，因此分享給大家學習，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。
具體內容如下
#import "RecordingVideoViewController.h"
#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>
@interface RecordingVideoViewController ()<AVCaptureFileOutputRecordingDelegate>
//會話 負責輸入和輸出設備之間的數據傳遞
@property (strong,nonatomic) AVCaptureSession *captureSession;
//設備輸入 負責從AVCaptureDevice獲得輸入數據
@property (strong,nonatomic) AVCaptureDeviceInput *videoCaptureDeviceInput;
@property (strong,nonatomic) AVCaptureDeviceInput *audioCaptureDeviceInput;
//視頻輸出流
@property (strong,nonatomic) AVCaptureMovieFileOutput *captureMovieFileOutput;
//相機拍攝預覽圖層
@property (strong,nonatomic) AVCaptureVideoPreviewLayer *captureVideoPreviewLayer;
//自定義UI控件容器
@property (strong,nonatomic) UIView *viewContainer;
//聚焦圖標
@property (strong,nonatomic) UIImageView *focusCursor;
//錄制時長
@property (strong,nonatomic) UILabel *timeLabel;
//切換前后攝像頭
@property (strong,nonatomic) UIButton *switchCameraBtn;
//改變焦距
@property (strong,nonatomic) UIButton *scaleBtn;
//計時器
@property (strong,nonatomic) NSTimer *timer;
@end
@implementation RecordingVideoViewController {
@private
NSInteger _num;
CGFloat _kCameraScale;
}
- (UIView *)viewContainer {
if (!_viewContainer) {
_viewContainer = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
UIButton *takeButton = [UIButton buttonWithType:UIButtonTypeCustom];
takeButton.backgroundColor = [UIColor redColor];
[takeButton setTitle:@"start" forState:UIControlStateNormal];
[takeButton addTarget:self action:@selector(takeButtonClick:) forControlEvents:UIControlEventTouchUpInside];
_timeLabel = [[UILabel alloc] init];
_timeLabel.textColor = [UIColor redColor];
_timeLabel.textAlignment = NSTextAlignmentCenter;
_timeLabel.font = [UIFont boldSystemFontOfSize:20];
_timeLabel.text = @"00:00";
_switchCameraBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[_switchCameraBtn setTitle:@"switch" forState:UIControlStateNormal];
_switchCameraBtn.backgroundColor = [UIColor redColor];
[_switchCameraBtn addTarget:self action:@selector(switchCameraBtnClick) forControlEvents:UIControlEventTouchUpInside];
_scaleBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[_scaleBtn setTitle:@"1X" forState:UIControlStateNormal];
_scaleBtn.backgroundColor = [UIColor redColor];
[_scaleBtn addTarget:self action:@selector(scaleBtnClick:) forControlEvents:UIControlEventTouchUpInside];
[_viewContainer addSubview:takeButton];
[_viewContainer addSubview:_timeLabel];
[_viewContainer addSubview:_scaleBtn];
[_viewContainer addSubview:_switchCameraBtn];
[takeButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(60, 40));
make.centerX.mas_equalTo(_viewContainer);
make.bottom.mas_equalTo(_viewContainer).offset(-64);
}];
[_timeLabel mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerX.mas_equalTo(_viewContainer);
make.height.mas_equalTo(@30);
make.top.mas_equalTo(_viewContainer);
}];
[_scaleBtn mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(60, 40));
make.left.mas_equalTo(_viewContainer).offset(10);
make.top.mas_equalTo(_viewContainer);
}];
[_switchCameraBtn mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(60, 40));
make.top.mas_equalTo(_viewContainer);
make.right.mas_equalTo(_viewContainer).offset(-10);
}];
_focusCursor = [[UIImageView alloc] init];
kBorder(_focusCursor, 1, [UIColor yellowColor]);
_focusCursor.alpha = 0;
[_viewContainer addSubview:self.focusCursor];
[_focusCursor mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(40, 40));
make.center.mas_equalTo(_viewContainer);
}];
}
return _viewContainer;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"視頻錄制";
_kCameraScale = 1.0f;
//初始化會話對象
_captureSession = [[AVCaptureSession alloc] init];
if ([_captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) {
_captureSession.sessionPreset = AVCaptureSessionPreset1280x720;
}
NSError *error = nil;
//獲取視頻輸入對象
AVCaptureDevice *videoCaptureDevice = [self cameraDeviceWithPosition:(AVCaptureDevicePositionBack)];
if (!videoCaptureDevice) {
NSLog(@"獲取后置攝像頭失敗！");
return;
}
_videoCaptureDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:videoCaptureDevice error:&error];
if (error) {
NSLog(@"取得視頻設備輸入對象時出錯");
return;
}
//獲取音頻輸入對象
AVCaptureDevice *audioCatureDevice = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject];
_audioCaptureDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:audioCatureDevice error:&error];
if (error) {
NSLog(@"取得音頻設備輸入對象時出錯");
return;
}
//初始化設備輸出對象
_captureMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
//將設備輸入添加到會話中
if ([_captureSession canAddInput:_videoCaptureDeviceInput]) {
[_captureSession addInput:_videoCaptureDeviceInput];
[_captureSession addInput:_audioCaptureDeviceInput];
//防抖功能
AVCaptureConnection *captureConnection = [_captureMovieFileOutput connectionWithMediaType:AVMediaTypeAudio];
if ([captureConnection isVideoStabilizationSupported]) {
captureConnection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeAuto;
}
}
//將設備輸出添加到會話中
if ([_captureSession canAddOutput:_captureMovieFileOutput]) {
[_captureSession addOutput:_captureMovieFileOutput];
}
//創建視頻預覽圖層
_captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession];
self.viewContainer.layer.masksToBounds = YES;
_captureVideoPreviewLayer.frame = self.viewContainer.bounds;
_captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.view.layer addSublayer:_captureVideoPreviewLayer];
//顯示自定義控件
[self.view addSubview:self.viewContainer];
//添加點按聚焦手勢
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapScreen:)];
[self.viewContainer addGestureRecognizer:tapGesture];
}
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
[self.captureSession startRunning];
}
-(void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];
[self.captureSession stopRunning];
[self.timer invalidate];
self.timer = nil;
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self.captureVideoPreviewLayer setAffineTransform:CGAffineTransformMakeScale(1, 1)];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
//開始 + 暫停錄制
- (void)takeButtonClick:(UIButton *)sender {
if ([self.captureMovieFileOutput isRecording]) {
[self.captureMovieFileOutput stopRecording];
[self.navigationController popViewControllerAnimated:YES];
} else {
AVCaptureConnection *captureConnection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo];
captureConnection.videoOrientation = [self.captureVideoPreviewLayer connection].videoOrientation;
NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"Movie.mov"];
NSLog(@"%@",filePath);
[self.captureMovieFileOutput startRecordingToOutputFileURL:[NSURL fileURLWithPath:filePath] recordingDelegate:self];
self.switchCameraBtn.hidden = YES;
sender.backgroundColor = [UIColor greenColor];
[sender setTitle:@"stop" forState:UIControlStateNormal];
self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeAction) userInfo:nil repeats:YES];
[self.timer setFireDate:[NSDate distantPast]];
}
}
//切換攝像頭
- (void)switchCameraBtnClick {
AVCaptureDevicePosition currentPosition = self.videoCaptureDeviceInput.device.position;
AVCaptureDevicePosition toPosition;
if (currentPosition == AVCaptureDevicePositionUnspecified ||
currentPosition == AVCaptureDevicePositionFront) {
toPosition = AVCaptureDevicePositionBack;
} else {
toPosition = AVCaptureDevicePositionFront;
}
AVCaptureDevice *toCapturDevice = [self cameraDeviceWithPosition:toPosition];
if (!toCapturDevice) {
NSLog(@"獲取要切換的設備失敗");
return;
}
NSError *error = nil;
AVCaptureDeviceInput *toVideoDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:toCapturDevice error:&error];
if (error) {
NSLog(@"獲取要切換的設備輸入失敗");
return;
}
//改變會話配置
[self.captureSession beginConfiguration];
[self.captureSession removeInput:self.videoCaptureDeviceInput];
if ([self.captureSession canAddInput:toVideoDeviceInput]) {
[self.captureSession addInput:toVideoDeviceInput];
self.videoCaptureDeviceInput = toVideoDeviceInput;
}
//提交會話配置
[self.captureSession commitConfiguration];
}
//點按手勢
- (void)tapScreen:(UITapGestureRecognizer *)tap {
CGPoint point = [tap locationInView:self.viewContainer];
//將界面point對應到攝像頭point
CGPoint cameraPoint = [self.captureVideoPreviewLayer captureDevicePointOfInterestForPoint:point];
//設置聚光動畫
self.focusCursor.center = point;
self.focusCursor.transform = CGAffineTransformMakeScale(1.5, 1.5);
self.focusCursor.alpha = 1.0f;
[UIView animateWithDuration:1 animations:^{
self.focusCursor.transform = CGAffineTransformIdentity;
} completion:^(BOOL finished) {
self.focusCursor.alpha = 0.0f;
}];
//設置聚光點坐標
[self focusWithMode:AVCaptureFocusModeAutoFocus exposureMode:AVCaptureExposureModeAutoExpose atPoint:cameraPoint];
}
/**設置聚焦點*/
-(void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{
AVCaptureDevice *captureDevice= [self.videoCaptureDeviceInput device];
NSError *error = nil;
//設置設備屬性必須先解鎖 然后加鎖
if ([captureDevice lockForConfiguration:&error]) {
if ([captureDevice isFocusModeSupported:focusMode]) {
[captureDevice setFocusMode:focusMode];
}
if ([captureDevice isFocusPointOfInterestSupported]) {
[captureDevice setFocusPointOfInterest:point];
}
// //曝光
// if ([captureDevice isExposureModeSupported:exposureMode]) {
// [captureDevice setExposureMode:exposureMode];
// }
// if ([captureDevice isExposurePointOfInterestSupported]) {
// [captureDevice setExposurePointOfInterest:point];
// }
// //閃光燈模式
// if ([captureDevice isFlashModeSupported:AVCaptureFlashModeAuto]) {
// [captureDevice setFlashMode:AVCaptureFlashModeAuto];
// }
//加鎖
[captureDevice unlockForConfiguration];
}else{
NSLog(@"設置設備屬性過程發生錯誤，錯誤信息：%@",error.localizedDescription);
}
}
//調整焦距
-(void)scaleBtnClick:(UIButton *)sender
{
_kCameraScale += 0.5;
if(_kCameraScale > 3.0) {
_kCameraScale = 1.0;
}
//改變焦距
AVCaptureDevice *videoDevice = self.videoCaptureDeviceInput.device;
NSError *error = nil;
if ([videoDevice lockForConfiguration:&error]) {
[videoDevice setVideoZoomFactor:_kCameraScale];
[videoDevice unlockForConfiguration];
[sender setTitle:[NSString stringWithFormat:@"%lgX",_kCameraScale] forState:UIControlStateNormal];
[CATransaction begin];
[CATransaction setAnimationDuration:0.25];
[self.captureVideoPreviewLayer setAffineTransform:CGAffineTransformMakeScale(_kCameraScale, _kCameraScale)];
[CATransaction commit];
} else {
NSLog(@"修改設備屬性失敗!")
}
}
#pragma mark -------- AVCaptureFileOutputRecordingDelegate ----------
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections {
NSLog(@"開始錄制");
}
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error {
NSLog(@"錄制結束");
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
[assetsLibrary writeVideoAtPathToSavedPhotosAlbum:outputFileURL completionBlock:^(NSURL *assetURL, NSError *error) {
if (error) {
NSLog(@"保存視頻到相簿過程中發生錯誤，錯誤信息：%@",error.localizedDescription);
}
}];
}
//錄制計時
- (void)timeAction {
self.timeLabel.text = [NSString stringWithFormat:@"%.2ld:%.2ld",_num/60,_num%60];
_num ++;
}
/**取得指定位置的攝像頭*/
- (AVCaptureDevice *)cameraDeviceWithPosition:(AVCaptureDevicePosition )position{
NSArray *cameras = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *camera in cameras) {
if ([camera position] == position) {
return camera;
}
}
return nil;
}
@end參考代碼：
#import "VideoTestViewController.h"
#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>
typedef void(^PropertyChangeBlock)(AVCaptureDevice *captureDevice);
@interface VideoTestViewController ()<AVCaptureFileOutputRecordingDelegate>//視頻文件輸出代理
@property (strong,nonatomic) AVCaptureSession *captureSession;//負責輸入和輸出設備之間的數據傳遞
@property (strong,nonatomic) AVCaptureDeviceInput *captureDeviceInput;//負責從AVCaptureDevice獲得輸入數據
@property (strong,nonatomic) AVCaptureMovieFileOutput *captureMovieFileOutput;//視頻輸出流
@property (strong,nonatomic) AVCaptureVideoPreviewLayer *captureVideoPreviewLayer;//相機拍攝預覽圖層
@property (assign,nonatomic) BOOL enableRotation;//是否允許旋轉（注意在視頻錄制過程中禁止屏幕旋轉）
@property (assign,nonatomic) CGRect *lastBounds;//旋轉的前大小
@property (assign,nonatomic) UIBackgroundTaskIdentifier backgroundTaskIdentifier;//后臺任務標識
@property (strong,nonatomic) UIView *viewContainer;
@property (strong,nonatomic) UIButton *takeButton;//拍照按鈕
@property (strong,nonatomic) UIImageView *focusCursor; //聚焦光標
@end
@implementation VideoTestViewController
#pragma mark - 控制器視圖方法
- (void)viewDidLoad {
[super viewDidLoad];
}
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
//初始化會話
_captureSession=[[AVCaptureSession alloc]init];
if ([_captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) {//設置分辨率
_captureSession.sessionPreset=AVCaptureSessionPreset1280x720;
}
//獲得輸入設備
AVCaptureDevice *captureDevice=[self getCameraDeviceWithPosition:AVCaptureDevicePositionBack];//取得后置攝像頭
if (!captureDevice) {
NSLog(@"取得后置攝像頭時出現問題.");
return;
}
//添加一個音頻輸入設備
AVCaptureDevice *audioCaptureDevice=[[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject];
NSError *error=nil;
//根據輸入設備初始化設備輸入對象，用于獲得輸入數據
_captureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:captureDevice error:&error];
if (error) {
NSLog(@"取得設備輸入對象時出錯，錯誤原因：%@",error.localizedDescription);
return;
}
AVCaptureDeviceInput *audioCaptureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:audioCaptureDevice error:&error];
if (error) {
NSLog(@"取得設備輸入對象時出錯，錯誤原因：%@",error.localizedDescription);
return;
}
//初始化設備輸出對象，用于獲得輸出數據
_captureMovieFileOutput=[[AVCaptureMovieFileOutput alloc]init];
//將設備輸入添加到會話中
if ([_captureSession canAddInput:_captureDeviceInput]) {
[_captureSession addInput:_captureDeviceInput];
[_captureSession addInput:audioCaptureDeviceInput];
AVCaptureConnection *captureConnection=[_captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo];
if ([captureConnection isVideoStabilizationSupported ]) {
captureConnection.preferredVideoStabilizationMode=AVCaptureVideoStabilizationModeAuto;
}
}
//將設備輸出添加到會話中
if ([_captureSession canAddOutput:_captureMovieFileOutput]) {
[_captureSession addOutput:_captureMovieFileOutput];
}
//創建視頻預覽層，用于實時展示攝像頭狀態
_captureVideoPreviewLayer=[[AVCaptureVideoPreviewLayer alloc]initWithSession:self.captureSession];
CALayer *layer=self.viewContainer.layer;
layer.masksToBounds=YES;
_captureVideoPreviewLayer.frame=layer.bounds;
_captureVideoPreviewLayer.videoGravity=AVLayerVideoGravityResizeAspectFill;//填充模式
//將視頻預覽層添加到界面中
//[layer addSublayer:_captureVideoPreviewLayer];
[layer insertSublayer:_captureVideoPreviewLayer below:self.focusCursor.layer];
_enableRotation=YES;
[self addNotificationToCaptureDevice:captureDevice];
[self addGenstureRecognizer];
}
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
[self.captureSession startRunning];
}
-(void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];
[self.captureSession stopRunning];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
-(BOOL)shouldAutorotate{
return self.enableRotation;
}
////屏幕旋轉時調整視頻預覽圖層的方向
//-(void)willTransitionToTraitCollection:(UITraitCollection *)newCollection withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator{
// [super willTransitionToTraitCollection:newCollection withTransitionCoordinator:coordinator];
//// NSLog(@"%i,%i",newCollection.verticalSizeClass,newCollection.horizontalSizeClass);
// UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
// NSLog(@"%i",orientation);
// AVCaptureConnection *captureConnection=[self.captureVideoPreviewLayer connection];
// captureConnection.videoOrientation=orientation;
//
//}
//屏幕旋轉時調整視頻預覽圖層的方向
-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
AVCaptureConnection *captureConnection=[self.captureVideoPreviewLayer connection];
captureConnection.videoOrientation=(AVCaptureVideoOrientation)toInterfaceOrientation;
}
//旋轉后重新設置大小
-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{
_captureVideoPreviewLayer.frame=self.viewContainer.bounds;
}
-(void)dealloc{
[self removeNotification];
}
#pragma mark - UI方法
#pragma mark 視頻錄制
- (void)takeButtonClick:(UIButton *)sender {
//根據設備輸出獲得連接
AVCaptureConnection *captureConnection=[self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo];
//根據連接取得設備輸出的數據
if (![self.captureMovieFileOutput isRecording]) {
self.enableRotation=NO;
//如果支持多任務則則開始多任務
if ([[UIDevice currentDevice] isMultitaskingSupported]) {
self.backgroundTaskIdentifier=[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];
}
//預覽圖層和視頻方向保持一致
captureConnection.videoOrientation=[self.captureVideoPreviewLayer connection].videoOrientation;
NSString *outputFielPath=[NSTemporaryDirectory() stringByAppendingString:@"myMovie.mov"];
NSLog(@"save path is :%@",outputFielPath);
NSURL *fileUrl=[NSURL fileURLWithPath:outputFielPath];
[self.captureMovieFileOutput startRecordingToOutputFileURL:fileUrl recordingDelegate:self];
}
else{
[self.captureMovieFileOutput stopRecording];//停止錄制
}
}
#pragma mark 切換前后攝像頭
- (void)toggleButtonClick:(UIButton *)sender {
AVCaptureDevice *currentDevice=[self.captureDeviceInput device];
AVCaptureDevicePosition currentPosition=[currentDevice position];
[self removeNotificationFromCaptureDevice:currentDevice];
AVCaptureDevice *toChangeDevice;
AVCaptureDevicePosition toChangePosition=AVCaptureDevicePositionFront;
if (currentPosition==AVCaptureDevicePositionUnspecified||currentPosition==AVCaptureDevicePositionFront) {
toChangePosition=AVCaptureDevicePositionBack;
}
toChangeDevice=[self getCameraDeviceWithPosition:toChangePosition];
[self addNotificationToCaptureDevice:toChangeDevice];
//獲得要調整的設備輸入對象
AVCaptureDeviceInput *toChangeDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:toChangeDevice error:nil];
//改變會話的配置前一定要先開啟配置，配置完成后提交配置改變
[self.captureSession beginConfiguration];
//移除原有輸入對象
[self.captureSession removeInput:self.captureDeviceInput];
//添加新的輸入對象
if ([self.captureSession canAddInput:toChangeDeviceInput]) {
[self.captureSession addInput:toChangeDeviceInput];
self.captureDeviceInput=toChangeDeviceInput;
}
//提交會話配置
[self.captureSession commitConfiguration];
}
#pragma mark - 視頻輸出代理
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections{
NSLog(@"開始錄制...");
}
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{
NSLog(@"視頻錄制完成.");
//視頻錄入完成之后在后臺將視頻存儲到相簿
self.enableRotation=YES;
UIBackgroundTaskIdentifier lastBackgroundTaskIdentifier=self.backgroundTaskIdentifier;
self.backgroundTaskIdentifier=UIBackgroundTaskInvalid;
ALAssetsLibrary *assetsLibrary=[[ALAssetsLibrary alloc]init];
[assetsLibrary writeVideoAtPathToSavedPhotosAlbum:outputFileURL completionBlock:^(NSURL *assetURL, NSError *error) {
if (error) {
NSLog(@"保存視頻到相簿過程中發生錯誤，錯誤信息：%@",error.localizedDescription);
}
if (lastBackgroundTaskIdentifier!=UIBackgroundTaskInvalid) {
[[UIApplication sharedApplication] endBackgroundTask:lastBackgroundTaskIdentifier];
}
NSLog(@"成功保存視頻到相簿.");
}];
}
#pragma mark - 通知
/**
* 給輸入設備添加通知
*/
-(void)addNotificationToCaptureDevice:(AVCaptureDevice *)captureDevice{
//注意添加區域改變捕獲通知必須首先設置設備允許捕獲
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
captureDevice.subjectAreaChangeMonitoringEnabled=YES;
}];
NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
//捕獲區域發生改變
[notificationCenter addObserver:self selector:@selector(areaChange:) name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice];
}
-(void)removeNotificationFromCaptureDevice:(AVCaptureDevice *)captureDevice{
NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
[notificationCenter removeObserver:self name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice];
}
/**
* 移除所有通知
*/
-(void)removeNotification{
NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
[notificationCenter removeObserver:self];
}
-(void)addNotificationToCaptureSession:(AVCaptureSession *)captureSession{
NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
//會話出錯
[notificationCenter addObserver:self selector:@selector(sessionRuntimeError:) name:AVCaptureSessionRuntimeErrorNotification object:captureSession];
}
/**
* 設備連接成功
*
* @param notification 通知對象
*/
-(void)deviceConnected:(NSNotification *)notification{
NSLog(@"設備已連接...");
}
/**
* 設備連接斷開
*
* @param notification 通知對象
*/
-(void)deviceDisconnected:(NSNotification *)notification{
NSLog(@"設備已斷開.");
}
/**
* 捕獲區域改變
*
* @param notification 通知對象
*/
-(void)areaChange:(NSNotification *)notification{
NSLog(@"捕獲區域改變...");
}
/**
* 會話出錯
*
* @param notification 通知對象
*/
-(void)sessionRuntimeError:(NSNotification *)notification{
NSLog(@"會話發生錯誤.");
}
#pragma mark - 私有方法
/**
* 取得指定位置的攝像頭
*
* @param position 攝像頭位置
*
* @return 攝像頭設備
*/
-(AVCaptureDevice *)getCameraDeviceWithPosition:(AVCaptureDevicePosition )position{
NSArray *cameras= [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *camera in cameras) {
if ([camera position]==position) {
return camera;
}
}
return nil;
}
/**
* 改變設備屬性的統一操作方法
*
* @param propertyChange 屬性改變操作
*/
-(void)changeDeviceProperty:(PropertyChangeBlock)propertyChange{
AVCaptureDevice *captureDevice= [self.captureDeviceInput device];
NSError *error;
//注意改變設備屬性前一定要首先調用lockForConfiguration:調用完之后使用unlockForConfiguration方法解鎖
if ([captureDevice lockForConfiguration:&error]) {
propertyChange(captureDevice);
[captureDevice unlockForConfiguration];
}else{
NSLog(@"設置設備屬性過程發生錯誤，錯誤信息：%@",error.localizedDescription);
}
}
/**
* 設置閃光燈模式
*
* @param flashMode 閃光燈模式
*/
-(void)setFlashMode:(AVCaptureFlashMode )flashMode{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isFlashModeSupported:flashMode]) {
[captureDevice setFlashMode:flashMode];
}
}];
}
/**
* 設置聚焦模式
*
* @param focusMode 聚焦模式
*/
-(void)setFocusMode:(AVCaptureFocusMode )focusMode{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isFocusModeSupported:focusMode]) {
[captureDevice setFocusMode:focusMode];
}
}];
}
/**
* 設置曝光模式
*
* @param exposureMode 曝光模式
*/
-(void)setExposureMode:(AVCaptureExposureMode)exposureMode{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isExposureModeSupported:exposureMode]) {
[captureDevice setExposureMode:exposureMode];
}
}];
}
/**
* 設置聚焦點
*
* @param point 聚焦點
*/
-(void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isFocusModeSupported:focusMode]) {
[captureDevice setFocusMode:AVCaptureFocusModeAutoFocus];
}
if ([captureDevice isFocusPointOfInterestSupported]) {
[captureDevice setFocusPointOfInterest:point];
}
if ([captureDevice isExposureModeSupported:exposureMode]) {
[captureDevice setExposureMode:AVCaptureExposureModeAutoExpose];
}
if ([captureDevice isExposurePointOfInterestSupported]) {
[captureDevice setExposurePointOfInterest:point];
}
}];
}
/**
* 添加點按手勢，點按時聚焦
*/
-(void)addGenstureRecognizer{
UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapScreen:)];
[self.viewContainer addGestureRecognizer:tapGesture];
}
-(void)tapScreen:(UITapGestureRecognizer *)tapGesture{
CGPoint point= [tapGesture locationInView:self.viewContainer];
//將UI坐標轉化為攝像頭坐標
CGPoint cameraPoint= [self.captureVideoPreviewLayer captureDevicePointOfInterestForPoint:point];
[self setFocusCursorWithPoint:point];
[self focusWithMode:AVCaptureFocusModeAutoFocus exposureMode:AVCaptureExposureModeAutoExpose atPoint:cameraPoint];
}
/**
* 設置聚焦光標位置
*
* @param point 光標位置
*/
-(void)setFocusCursorWithPoint:(CGPoint)point{
self.focusCursor.center=point;
self.focusCursor.transform=CGAffineTransformMakeScale(1.5, 1.5);
self.focusCursor.alpha=1.0;
[UIView animateWithDuration:1.0 animations:^{
self.focusCursor.transform=CGAffineTransformIdentity;
} completion:^(BOOL finished) {
self.focusCursor.alpha=0;
}];
}
@end以上就是怎么在iOS中使用AVCaptureSession實現視頻錄制功能，小編相信有部分知識點可能是我們日常工作會見到或用到的。希望你能通過這篇文章學到更多知識。更多詳情敬請關注億速云行業資訊頻道。
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