获取音/视频设备输入输出流

获取音/视频设备输入输出流

1，add AVFoundation.framework，AssetsLibrary.framework。

第一个用于获取设备摄像头，话筒，第二个保存到相册将视频。

2，

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//apple媒体框架 #import //C内存管理库 #import //apple 媒体文件框架 #import

3，add delegate

4，.h文件

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// //  FourController.h //  VideoDemo // //  Created by skyzizhu on 15/12/17. //  Copyright (c) 2015年 skyzizhu. All rights reserved. //   #import   #import   #import   #import   @ interface FourController : UIViewController < AVCaptureVideoDataOutputSampleBufferDelegate , AVCaptureAudioDataOutputSampleBufferDelegate > //视频输出 @ property ( nonatomic , strong ) AVCaptureVideoDataOutput * videoOutput ; //音频输出 @ property ( nonatomic , strong ) AVCaptureAudioDataOutput * audioOutput ; //当前录制session @ property ( nonatomic , strong ) AVCaptureSession * mediaSession ; //视频写入文件 @ property ( nonatomic , strong ) AVAssetWriterInput * videoWriterInput ; //音频写入文件 @ property ( nonatomic , strong ) AVAssetWriterInput * audioWriterInput ; //流写入 @ property ( nonatomic , strong ) AVAssetWriter * assetWriter ; //单独获取视频可以用这个属性，备用 @ property ( nonatomic , strong ) AVAssetWriterInputPixelBufferAdaptor * videoAssetWriterPixelBufferAdaptor ;   //layer //apple提供流媒体layer，用于时时展现录制的media @ property ( strong , nonatomic ) AVCaptureVideoPreviewLayer * captureVideoPreviewLayer ;     // @ end

5，.m文件

分别获取设备的摄像头，话筒(输入设备)。

分别配置视频的输出形式，配置类型等属性，这个是输出的属性，和写入的属性不同，视频和音频同事传入一个线程，两个用同一个线程就行，否则会崩溃，因为不同步。

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- ( AVCaptureVideoDataOutput * ) getVideoOutputWithQueue : ( dispatch_queue_t ) queue {           if ( _videoOutput != nil ) {               return _videoOutput ;           }           _videoOutput = [ [ AVCaptureVideoDataOutput alloc ] init ] ;           _videoOutput . alwaysDiscardsLateVideoFrames = YES ;           _videoOutput . videoSettings = [ NSDictionary dictionaryWithObject :                                  [ NSNumber numberWithInt : kCVPixelFormatType_32BGRA ] forKey : ( id ) kCVPixelBufferPixelFormatTypeKey ] ;           [ _videoOutput setSampleBufferDelegate : self queue : queue ] ;           return _videoOutput ;      }   - ( AVCaptureAudioDataOutput * ) getAudioOutputWithQueue : ( dispatch_queue_t ) queue {      if ( _audioOutput != nil ) {                   return _audioOutput ;               }           _audioOutput = [ [ AVCaptureAudioDataOutput alloc ] init ] ;           [ _audioOutput setSampleBufferDelegate : self queue : queue ] ;           return _audioOutput ; }

配置当前录制session，可以看成一种会话，分别将上边设置的输入输出添加到会话里边：

画一个view，限制当前录制流的layer，顺便添加一个停止按钮，用于停止之后将文件保存在相册中：

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- ( void ) setLayer {      UIView * v = [ [ UIView alloc ] initWithFrame : CGRectMake ( 50 , 100 , 280 , 400 ) ] ;           [ self . view addSubview : v ] ;      //当前流layer      _captureVideoPreviewLayer = [ [ AVCaptureVideoPreviewLayer alloc ] initWithSession : self . mediaSession ] ;           CALayer * layer = v . layer ;           layer . masksToBounds = YES ;           _captureVideoPreviewLayer . frame = layer . bounds ;      //显示模式      _captureVideoPreviewLayer . videoGravity = AVLayerVideoGravityResizeAspectFill ;           [ layer addSublayer : _captureVideoPreviewLayer ] ;           //           UIButton * stop = [ [ UIButton alloc ] initWithFrame : CGRectMake ( 200 , 550 , 100 , 60 ) ] ;           stop . center = CGPointMake ( self . view . center . x , stop . center . y ) ;           stop . backgroundColor = [ UIColor grayColor ] ;           [ stop setTitle : @ "停止" forState : UIControlStateNormal ] ;           [ stop setTitleColor : [ UIColor blackColor ] forState : UIControlStateNormal ] ;           [ self . view addSubview : stop ] ;           [ stop addTarget : self action : @ selector ( stopAction : ) forControlEvents : UIControlEventTouchUpInside ] ;      }

配置AVAssetWriter，将视频流实时写入到文件中：

获取实时的代理方法：

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- ( void ) captureOutput : ( AVCaptureOutput * ) captureOutput didOutputSampleBuffer : ( CMSampleBufferRef ) sampleBuffer fromConnection : ( AVCaptureConnection * ) connection {      //sampleBuffer是实时流，转换成data，查看大小      NSData * data = [ NSData dataWithBytes : & sampleBuffer length : malloc_size ( sampleBuffer ) ] ;           NSLog ( @ "%ld" , data . length ) ;         if ( ! CMSampleBufferDataIsReady ( sampleBuffer ) ) {               NSLog ( @ "sample buffer is not ready. Skipping sample" ) ;          return ;               }      //设置写入器的写入时间，开启写入      if ( _assetWriter . status == AVAssetWriterStatusUnknown )      {          CMTime startTime = CMSampleBufferGetPresentationTimeStamp ( sampleBuffer ) ;                   [ _assetWriter startWriting ] ;          [ _assetWriter startSessionAtSourceTime : startTime ] ;      }           if ( _assetWriter . status == AVAssetWriterStatusFailed ) {                   NSLog ( @ "error - %@" , _assetWriter . error ) ;               }      //判断如果正在读取，则直接写入      if ( _assetWriter . status == AVAssetWriterStatusWriting ) {      //写入视频          if ( [ captureOutput isKindOfClass : [ _audioOutput class ] ] ) {                           [ _audioWriterInput appendSampleBuffer : sampleBuffer ] ;                   }          //写入音频          if ( [ captureOutput isKindOfClass : [ _videoOutput class ] ] ) {                       [ _videoWriterInput appendSampleBuffer : sampleBuffer ] ;          } }

button event

调用：

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- ( void ) viewDidLoad {      [ super viewDidLoad ] ;           //write      //先配置写入，然后录制，否则两个不在同一个线程，导致崩溃      [ self setMediaWriter ] ;           //session      [ self setMediaSession ] ;           //add media layer      [ self setLayer ] ;      // Do any additional setup after loading the view. }

延伸：

如果单独写入视频，则用AVAssetWriterInputPixelBufferAdaptor类型就可以写入，在代理方法里边：

如果不想用系统的实时layer，则可以将转换的data转换成iamge，通过切换iamgeview的图片实时播放视频：

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//将buffer转换的data转换成image，放在view上 - ( void ) recieveVideoFromData : ( NSData * ) data {      CMSampleBufferRef sampleBuffer ;      [ data getBytes : & sampleBuffer length : sizeof ( sampleBuffer ) ] ;           CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer ( sampleBuffer ) ;      CVPixelBufferLockBaseAddress ( imageBuffer , 0 ) ;      uint8_t * baseAddress = ( uint8_t * ) CVPixelBufferGetBaseAddress ( imageBuffer ) ;      size_t bytesPerRow = CVPixelBufferGetBytesPerRow ( imageBuffer ) ;      size_t width = CVPixelBufferGetWidth ( imageBuffer ) ;      size_t height = CVPixelBufferGetHeight ( imageBuffer ) ;           CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB ( ) ;      CGContextRef newContext = CGBitmapContextCreate ( baseAddress ,                                                      width , height , 8 , bytesPerRow , colorSpace ,                                                      kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst ) ;      CGImageRef newImage = CGBitmapContextCreateImage ( newContext ) ;           CGContextRelease ( newContext ) ;      CGColorSpaceRelease ( colorSpace ) ;           UIImage * image = [ UIImage imageWithCGImage : newImage scale : 1.0                                    orientation : UIImageOrientationRight ] ;           CGImageRelease ( newImage ) ;      [ self . imageView performSelectorOnMainThread : @ selector ( setImage : )                                      withObject : image waitUntilDone : YES ] ;      CVPixelBufferUnlockBaseAddress ( imageBuffer , 0 ) ;           }

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