基于CameraKit，通过avrecorder进行录像

let cameraManager: camera.CameraManager = camera.getCameraManager(context);
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let cameraArray: Array<camera.CameraDevice> = cameraManager.getSupportedCameras();
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let sceneModes: Array<camera.SceneMode> = cameraManager.getSupportedSceneModes(cameraArray[0]);
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let cameraInput: camera.CameraInput = cameraManager.createCameraInput(cameraArray[0]);
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let previewOutput: camera.PreviewOutput = cameraManager.createPreviewOutput(previewProfilesArray[0], surfaceId);
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let avRecorder: media.AVRecorder = await media.createAVRecorder(); 
let videoSurfaceId = await avRecorder.getInputSurface();
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let aVRecorderProfile: media.AVRecorderProfile = { 
  fileFormat : media.ContainerFormatType.CFT_MPEG_4, // 视频文件封装格式，只支持MP4 
  videoBitrate : 100000, // 视频比特率 
  videoCodec : media.CodecMimeType.VIDEO_AVC, // 视频文件编码格式，支持avc格式 
  videoFrameWidth : 640,  // 视频分辨率的宽 
  videoFrameHeight : 480, // 视频分辨率的高 
  videoFrameRate : 30 // 视频帧率 
};
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let aVRecorderConfig: media.AVRecorderConfig = { 
  videoSourceType: media.VideoSourceType.VIDEO_SOURCE_TYPE_SURFACE_YUV, 
  profile: aVRecorderProfile, 
  url: "fd://" + file.fd,//获取文件的fd,且创建的文件要有读写权限 
  rotation: 90 // 90°为默认竖屏显示角度，如果由于设备原因或应用期望以其他方式显示等原因，请根据实际情况调整该参数 
};
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// 创建avRecorder 
let avRecorder: media.AVRecorder = await media.createAVRecorder(); 
// avRecorder准备 
avRecorder.prepare(aVRecorderConfig); 
// 创建VideoOutput对象 
let videoOutput: camera.VideoOutput | undefined = undefined; 
// createVideoOutput传入的videoProfile对象的宽高需要和aVRecorderProfile保持一致。 
let videoProfile: undefined | camera.VideoProfile = videoProfilesArray.find((profile: camera.VideoProfile) => { 
  return profile.size.width === aVRecorderProfile.videoFrameWidth && profile.size.height === aVRecorderProfile.videoFrameHeight; 
}); 
videoOutput = cameraManager.createVideoOutput(videoProfile, videoSurfaceId);
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//创建会话 
let videoSession: camera.CaptureSession | undefined = undefined; 
videoSession.beginConfig(); 
// 向会话中添加相机输入流 
videoSession.addInput(cameraInput); 
// 向会话中添加预览输出流 
videoSession.addOutput(previewOutput); 
// 向会话中添加录像输出流 
videoSession.addOutput(videoOutput); 
// 提交会话配置 
videoSession.commitConfig(); 
// 启动会话 
videoSession.start();
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// 启动录像输出流 
videoOutput.start() 
// 开始录像 
avRecorder.start(); 
// 停止录像 
avRecorder.stop();
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// 停止当前会话 
videoSession.stop(); 
// 释放相机输入流 
cameraInput.close(); 
// 释放预览输出流 
previewOutput.release(); 
// 释放录像输出流 
videoOutput.release(); 
// 释放会话 
videoSession.release(); 
// 会话置空 
videoSession = undefined;
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