使用AVFoundation实现视频录制详解
作者:reyzhang
这篇文章主要介绍了使用AVFoundation实现视频录制详解的相关资料,需要的朋友可以参考下
一、前言
AVCaptureSession 是 AVFoundation 的核心类,用于管理捕获对象 AVCaptureInput 的视频和音频的输入,协调捕获的输出 AVCaptureOutput。
AVCaptureOutput 的输出有两种方法:
- 一种是直接以 movieFileUrl 方式输出;
- 一种是以原始数据流 data 的方式输出
流程对比图如下:
下面详细讲解录制视频的方案:
二、AVCaptureSession + AVCaptureMovieFileOutput
1.创建AVCaptureSession
//导入 AVFoundation.framework #import <AVFoundation/AVFoundation.h> //声明属性 @property (nonatomic, strong) AVCaptureSession *captureSession; //懒加载 AVCapturesession - (AVCaptureSession *)captureSession { if (!_captureSession) { _captureSession = [[AVCaptureSession alloc] init]; //设置分辨率 if ([_captureSession canSetSessionPreset:AVCaptureSessionPresetHigh]) { [_captureSession setSessionPreset:AVCaptureSessionPresetHigh]; } } return _captureSession; }
注意:AVCaptureSession 的调用是会阻塞线程的,建议单独开辟子线程处理。2.设置音频、视频输入
//声明属性 @property (nonatomic, strong) AVCaptureDeviceInput *videoInput; @property (nonatomic, strong) AVCaptureDeviceInput *audioInput; //设置视频,音频输入源 - (void)setCaptureDeviceInput { //1. 视频输入源 //获取视频输入设备, 默认后置摄像头 AVCaptureDevice *videoCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; NSError *error = nil; self.videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoCaptureDevice error:&error]; if ([self.captureSession canAddInput:self.videoInput]) { [self.captureSession addInput:self.videoInput]; } //2. 音频输入源 AVCaptureDevice *audioCaptureDevice = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject]; self.audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioCaptureDevice error:&error]; if ([self.captureSession canAddInput:self.audioInput]) { [self.captureSession addInput:self.audioInput]; } }
3.设置文件输出源
//声明属性 @property (nonatomic, strong) AVCaptureMovieFileOutput *movieFileOutput; @property (nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer; //设置文件输出源 - (void)setDeviceFileOutput { //初始化文件输出对象 self.movieFileOutput = [[AVCaptureMovieFileOutput alloc] init]; //捕获会话中特定捕获输入对象和捕获输出对象之间的连接 AVCaptureConnection *captureConnection = [self.movieFileOutput connectionWithMediaType:AVMediaTypeVideo]; //设置防抖 if ([captureConnection isVideoStabilizationSupported]) { captureConnection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeAuto; } //预览图层和视频方向保持一致 captureConnection.videoOrientation = [self.previewLayer connection].videoOrientation; //添加文件输出源 if ([self.captureSession canAddOutput:self.movieFileOutput]) { [self.captureSession addOutput:self.movieFileOutput]; } }
4.添加视频预览层
- (void)setVideoPreviewLayer { self.previewLayer.frame = [UIScreen mainScreen].bounds; [self.superView.layer addSubLayer:self.previewLayer]; } - (AVCaptureVideoPreviewLayer *)previewLayer { if (!_previewLayer) { _previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession]; _previewLayer.masksToBounds = YES; _previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;//填充模式 } return _previewLayer; }
5. 开始采集
//声明属性 @property (nonatomic, strong) dispatch_queue_t sessionQueue; //开始采集 - (void)startCapture { self.sessionQueue = dispatch_queue_create("com.capturesession.queue", DISPATCH_QUEUE_CONCURRENT); if (![self.captureSession isRunning]) { __weak __typeof(self) weakSelf = self; dispatch_async(self.sessionQueue, ^{ [weakSelf.captureSession startRunning]; }); } }
6. 开始录制
//开始录制 - (void)startRecord { [self.movieFileOutput startRecordingToOutputFileURL:[self createVideoPath] recordingDelegate:self]; }
当实际的录制开始或停止时,系统会有代理回调。当开始录制之后,这时可能还没有真正写入,真正开始写入会回调下面代理,停止录制也是如此,所以如果你需要对录制视频起始点操作,建议通过系统的回调代理:
//实现协议 <AVCaptureFileOutputRecordingDelegate>中的方法 #pragma mark _ AVCaptureFileOutputRecordingDelegate //起始点 - 开始录制 - (void)captureOutput:(AVCaptureFileOutput *)output didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray<AVCaptureConnection *> *)connections { } //结束录制 -(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error { NSLog(@"视频录制完成. 文件路径:%@",[outputFileURL absoluteString]); }
7.停止录制
//停止录制 - (void)stopRecord { if ([self.movieFileOutput isRecording]) { [self.movieFileOutput stopRecording]; } }
8.停止采集
//停止采集 - (void)stopCapture { if ([self.captureSession isRunning]) { __weak __typeof(self) weakSelf = self; dispatch_async(self.sessionQueue, ^{ [weakSelf.captureSession stopRunning]; weakSelf.captureSession = nil; }); } }
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