iOS使用原生AVCapture系列

概述：

可用于音频、二维码、拍照、录制视频 （均可自定义界面）

常见的输出信号：

• avcaptureaudiodataoutput 音频输出
• avcapturefileoutput 文本输出
• avcapturemetadataoutput 二维码 条形码…
• avcapturestillimageoutput 拍照
• avcapturemoviefileoutput 录制视频（不能实现暂停录制和定义视频文件类型）
• avcapturevideodataoutput + avcaptureaudiodataoutput 录制视频的灵活性更强（能实现暂停录制和定义视频文件类型）

avcapturemoviefileoutput输出流实现视频录制

初始化会话层

-(void)sessionconfiguration{

  //初始化一个会话
  session = [[avcapturesession alloc] init];
  [session setsessionpreset:avcapturesessionpresetmedium];

  //创建视频设备
  avcapturedevice *videodevice = [avcapturedevice defaultdevicewithmediatype:avmediatypevideo];

  //根据设备创建输入信号
  deviceinput = [avcapturedeviceinput deviceinputwithdevice:videodevice error:nil];

  //添加 输出设备 moviefile
  self.devicemoviefileoutput = [[avcapturemoviefileoutput alloc] init];

  [session beginconfiguration];
  //session添加设备输入信号
  if ([session canaddinput:deviceinput]) {
    [session addinput:deviceinput];
  }
  //session添加设备输出信号
  if ([session canaddoutput:self.devicemoviefileoutput]) {
    [session addoutput:self.devicemoviefileoutput];
  }
  [session commitconfiguration];
}

创建预览图层

-(void)embedlayerwithview:(uiview *)view{
  if (session == nil) {
    return;
  }
  videopreviewlayer = [avcapturevideopreviewlayer layerwithsession:session];
  //设置图层的大小
  videopreviewlayer.frame = view.bounds;
  videopreviewlayer.videogravity = avlayervideogravityresizeaspectfill;
  [view.layer addsublayer:videopreviewlayer];
  [session startrunning];
}

录制视频

-(void)takephoto:(nsurl *)fileurl{
  [self.devicemoviefileoutput startrecordingtooutputfileurl:fileurl recordingdelegate:self];
}

结束录制

-(uiimageview *)finishrecord:(uiview *)view isanewrecording:(bool)anewrecording{
  gifimageview = [[uiimageview alloc] initwithframe:view.bounds];
  [view addsubview:gifimageview];
  isanewrecording = anewrecording; //存储是否重新录制
  //停止录制(停止录制后做代理方法)
  [self.devicemoviefileoutput stoprecording];
  return gifimageview;
}

拍摄视频保存路径

+(nsstring *)getvideosavefilepath{
  nsstring*documentpath = [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) lastobject];
  nsstring *filepath = [documentpath stringbyappendingpathcomponent:@"video.mp4"];
  return filepath;
}

会话层启动和关闭

-(void)startcamera{
  [session startrunning];
}

-(void)stopcamera{
  [session stoprunning];
}

代理方法

- (void)captureoutput:(avcapturefileoutput *)captureoutput didfinishrecordingtooutputfileaturl:(nsurl *)outputfileurl fromconnections:(nsarray *)connections error:(nserror *)error{

  nslog(@"完成录制");
  nslog(@"outputfileurl = %@",outputfileurl);

  //**重新录制**//
  if (isanewrecording) {
    //**删除视频文件**//
    nsfilemanager *manager = [nsfilemanager defaultmanager];
    [manager removeitematpath:outputfileurl.absolutestring error:nil];
  }
  //**不取消录制**//
  else{
    //**获取视频时长**//
    avurlasset *avurl = [avurlasset urlassetwithurl:outputfileurl options:nil];
    cmtime time = [avurl duration];
    int seconds = ceil(time.value/time.timescale);

    nslog(@"seconds = %d",seconds);

    if ([self.delegate respondstoselector:@selector(videoduration:)]) {
      [self.delegate videoduration:seconds];
    }
    if ([self.delegate respondstoselector:@selector(playervideo:)]) {
      [self.delegate playervideo:outputfileurl.absolutestring];
    }
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。