Demo 地址
JCVideoRecord
最近有个需求涉及到录制一个小视频上传服务器，所以写了这个Demo，在这记录下，供学习用，主要使用的是AVFoundation 框架。
IMB_AX2vxc.GIF
使用
- (void)present{
_recordView = [[JCVideoRecordView alloc]initWithFrame:[UIScreen mainScreen].bounds];
_recordView.cancelBlock = ^{
};
_recordView.completionBlock = ^(NSURL *fileUrl) {
};
[_recordView present];
}
简单介绍
1.目录结构
屏幕快照 2017-09-29 下午1.29.07.png
2. 流程
创建JCVideoRecordView时，初始化JCVideoRecordManager, JCVideoRecordManager负责管理视频采集，录制，压缩等操作，录制结束后创建JCRecordPlayerView 来循环播放录制的视频，点击确定回调给VCL。
$ 主要代码
JCVideoRecordManager.h
@protocol JCVideoRecordManagerDelegate <NSObject>
//录制结束
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error;
//录制时间
- (void)recordTimeCurrentTime:(CGFloat)currentTime totalTime:(CGFloat)totalTime;
@end
@interface JCVideoRecordManager : NSObject
@property (nonatomic, weak) id<JCVideoRecordManagerDelegate> delegate;
//摄像头视图层
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *preViewLayer;
// 准备录制
- (void)prepareForRecord;
// 开始录制
- (void)startRecordToFile:(NSURL *)outPutFile;
// 停止录制
- (void)stopCurrentVideoRecording;
// 切换摄像头
- (void)switchCamera;
// 设置对焦
- (void)setFoucusWithPoint:(CGPoint)point;
//压缩视频
- (void)compressVideo:(NSURL *)inputFileURL complete:(void(^)(BOOL success, NSURL* outputUrl))complete;
JCVideoRecordManager.m
- (instancetype)init{
self = [super init];
if (self) {
self.captureSession = [[AVCaptureSession alloc]init];
self.movieFileOutput = [[AVCaptureMovieFileOutput alloc]init];
//后台播放音频时需要注意加以下代码，否则会获取音频设备失败
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[[AVAudioSession sharedInstance] setMode:AVAudioSessionModeVideoRecording error:nil];
[[AVAudioSession sharedInstance] setActive:YES withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:nil];
[self prepareForRecord];
}
return self;
}
#pragma mark - 获取权限
+ (void)getCameraAuth:(void(^)(BOOL boolValue, NSString *tipText))isAuthorized{
__weak typeof(self) instance = self;
//获取视频权限
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if (authStatus == AVAuthorizationStatusNotDetermined){
[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo
completionHandler:^(BOOL granted) {
if (granted) {
[instance getCameraAuth:isAuthorized];
}else{
isAuthorized(NO, @"没有获得相机权限");
}
}];
}else if (authStatus == AVAuthorizationStatusAuthorized){
[[AVAudioSession sharedInstance] requestRecordPermission:^(BOOL granted) {
isAuthorized(granted, @"没有获得麦克风权限");
}];
}else{
isAuthorized(NO, @"没有获得相机权限");
}
}
#pragma mark - 摄像头视图层
- (AVCaptureVideoPreviewLayer *)preViewLayer{
if (!_preViewLayer) {
_preViewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];
_preViewLayer.masksToBounds = YES;
_preViewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
}
return _preViewLayer;
}
#pragma mark 视频输入
- (AVCaptureDeviceInput *)mediaDeviceInput{
if (!_mediaDeviceInput) {
__block AVCaptureDevice *backCamera = nil;
NSArray *cameras = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
[cameras enumerateObjectsUsingBlock:^(AVCaptureDevice *camera, NSUInteger idx, BOOL * _Nonnull stop) {
if(camera.position == AVCaptureDevicePositionBack){
backCamera = camera;
}
}];
[self setExposureModeWithDevice:backCamera];
_mediaDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:backCamera error:nil];
}
return _mediaDeviceInput;
}
#pragma mark 音频输入
- (AVCaptureDeviceInput *)audioDeviceInput{
if (!_audioDeviceInput) {
NSError *error;
_audioDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio] error:&error];
}
return _audioDeviceInput;
}
#pragma mark - 输入输出对象连接
- (AVCaptureConnection *)captureConnection{
return _captureConnection = _captureConnection ? : [self.movieFileOutput connectionWithMediaType:AVMediaTypeVideo];
}
#pragma mark 配置曝光模式 设置持续曝光模式
- (void)setExposureModeWithDevice:(AVCaptureDevice *)device{
//注意改变设备属性前一定要首先调用lockForConfiguration:调用完之后使用unlockForConfiguration方法解锁
NSError *error = nil;
[device lockForConfiguration:&error];
if ([device isExposureModeSupported:AVCaptureExposureModeContinuousAutoExposure]){
[device setExposureMode:AVCaptureExposureModeContinuousAutoExposure];
}
[device unlockForConfiguration];
}
#pragma mark 计时器相关
- (NSTimer *)timer{
if (!_timer){
_timer = [NSTimer scheduledTimerWithTimeInterval:KTimerInterval target:self selector:@selector(fire:) userInfo:nil repeats:YES];
}
return _timer;
}
- (void)fire:(NSTimer *)timer{
self.recordTime += KTimerInterval;
if ([self.delegate respondsToSelector:@selector(recordTimeCurrentTime:totalTime:)]) {
[self.delegate recordTimeCurrentTime:self.recordTime totalTime:KMaxRecordTime];
}
if(_recordTime >= KMaxRecordTime){
[self stopCurrentVideoRecording];
}
}
- (void)startTimer{
[self.timer invalidate];
self.timer = nil;
self.recordTime = 0;
[self.timer fire];
}
- (void)stopTimer{
[self.timer invalidate];
self.timer = nil;
}
#pragma mark 准备录制
- (void)prepareForRecord{
[self.captureSession beginConfiguration];
//视频采集质量
[self.captureSession canSetSessionPreset:AVCaptureSessionPresetHigh] ? [self.captureSession setSessionPreset:AVCaptureSessionPresetHigh] : nil;
//添加input
[self.captureSession canAddInput:self.mediaDeviceInput] ? [self.captureSession addInput:self.mediaDeviceInput] : nil;
[self.captureSession canAddInput:self.audioDeviceInput] ? [self.captureSession addInput:self.audioDeviceInput] : nil;
//添加output
[self.captureSession canAddOutput:self.movieFileOutput] ? [self.captureSession addOutput:self.movieFileOutput] : nil;
[self.captureSession commitConfiguration];
// 防抖功能
if ([self.captureConnection isVideoStabilizationSupported] && self.captureConnection.activeVideoStabilizationMode == AVCaptureVideoStabilizationModeOff){
self.captureConnection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeAuto;
}
[self.captureSession startRunning];
}
#pragma mark 切换摄像头
- (void)switchCamera{
[_captureSession beginConfiguration];
[_captureSession removeInput:_mediaDeviceInput];
AVCaptureDevice *swithToDevice = [self switchCameraDevice];
[swithToDevice lockForConfiguration:nil];
[self setExposureModeWithDevice:swithToDevice];
self.mediaDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:swithToDevice error:nil];
[_captureSession addInput:_mediaDeviceInput];
[_captureSession commitConfiguration];
}
#pragma mark 获取切换时的摄像头
- (AVCaptureDevice *)switchCameraDevice{
AVCaptureDevice *currentDevice = [self.mediaDeviceInput device];
AVCaptureDevicePosition currentPosition = [currentDevice position];
BOOL isUnspecifiedOrFront = (currentPosition == AVCaptureDevicePositionUnspecified || currentPosition ==AVCaptureDevicePositionFront );
AVCaptureDevicePosition swithToPosition = isUnspecifiedOrFront ? AVCaptureDevicePositionBack:AVCaptureDevicePositionFront;
NSArray *cameras = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
__block AVCaptureDevice *swithCameraDevice = nil;
[cameras enumerateObjectsUsingBlock:^(AVCaptureDevice *camera, NSUInteger idx, BOOL * _Nonnull stop) {
if (camera.position == swithToPosition){
swithCameraDevice = camera;
*stop = YES;
};
}];
return swithCameraDevice;
}
#pragma mark 开始录制
- (void)startRecordToFile:(NSURL *)outPutFile{
if (!self.captureConnection) {
return;
}
if ([self.movieFileOutput isRecording]) {
return;
}
if ([self.captureConnection isVideoOrientationSupported]){
self.captureConnection.videoOrientation =[self.preViewLayer connection].videoOrientation;
}
[_movieFileOutput startRecordingToOutputFileURL:outPutFile recordingDelegate:self];
}
#pragma mark 停止录制
- (void)stopCurrentVideoRecording{
if (self.movieFileOutput.isRecording) {
[self stopTimer];
[_movieFileOutput stopRecording];
}
}
#pragma mark 设置对焦
- (void)setFoucusWithPoint:(CGPoint)point{
CGPoint cameraPoint= [self.preViewLayer captureDevicePointOfInterestForPoint:point];
[self focusWithMode:AVCaptureFocusModeContinuousAutoFocus exposureMode:AVCaptureExposureModeContinuousAutoExposure atPoint:cameraPoint];
}
-(void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{
[self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
if ([captureDevice isFocusModeSupported:focusMode]) {
[captureDevice setFocusMode:focusMode];
}
if ([captureDevice isFocusPointOfInterestSupported]) {
[captureDevice setFocusPointOfInterest:point];
}
if ([captureDevice isExposureModeSupported:exposureMode]) {
[captureDevice setExposureMode:exposureMode];
}
if ([captureDevice isExposurePointOfInterestSupported]) {
[captureDevice setExposurePointOfInterest:point];
}
}];
}
#pragma mark - 改变设备属性方法
- (void)changeDeviceProperty:(void (^)(id obj))propertyChange
{
AVCaptureDevice *captureDevice = [self.mediaDeviceInput device];
NSError *error;
if ([captureDevice lockForConfiguration:&error]) {
propertyChange(captureDevice);
[captureDevice unlockForConfiguration];
}else{
}
}
#pragma mark - AVCaptureFileOutputRecordignDelegate method
// 录制开始
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections{
[self startTimer];
}
// 录制结束
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{
[self stopTimer];
if (self.delegate && [self.delegate respondsToSelector:@selector(captureOutput:didFinishRecordingToOutputFileAtURL:fromConnections:error:)]) {
[self.delegate captureOutput:captureOutput didFinishRecordingToOutputFileAtURL:outputFileURL fromConnections:connections error:error];
}
[self.captureSession stopRunning];
}
#pragma mark - 压缩视频
- (void)compressVideo:(NSURL *)inputFileURL complete:(void(^)(BOOL success, NSURL* outputUrl))complete{
NSURL *outPutUrl = [NSURL fileURLWithPath:[JCVideoRecordManager cacheFilePath:NO]];
[self convertVideoQuailtyWithInputURL:inputFileURL outputURL:outPutUrl completeHandler:^(AVAssetExportSession *exportSession) {
complete(exportSession.status == AVAssetExportSessionStatusCompleted, outPutUrl);
}];
}
- (void)convertVideoQuailtyWithInputURL:(NSURL*)inputURL
outputURL:(NSURL*)outputURL
completeHandler:(void (^)(AVAssetExportSession*))handler{
AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:avAsset presetName:AVAssetExportPresetMediumQuality];
exportSession.outputURL = outputURL;
exportSession.outputFileType = AVFileTypeMPEG4;
exportSession.shouldOptimizeForNetworkUse= YES;
[exportSession exportAsynchronouslyWithCompletionHandler:^(void){
handler(exportSession);
}];
}
写在最后
demo还有很多需要完善的地方，例如视频剪裁，设备方向，闪光灯等，日后有时间继续完善。
Demo 地址
JCVideoRecord
参考
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