【HarmonyOS】自定义相机拍照和录像 （二）之录像
一、自定义相机录像开发思路：
大体开发思路与相机拍照思路相同，都是通过CameraKit进行相机设备调用，视频输入输出流和会话的绑定，在会话里设置相关参数。
唯一与拍照不同的区别是，通过avRecorder进行录像生命周期的管理，开始录像，暂停录像都是通过这个渲染播放对象进行管控。相对于拍照而言，录像的开发要麻烦一些。
二、录像开发步骤
自定义相机录像开发思路步骤为：
1.设置相机界面
2.选择相机摄像头实例
根据cameraKit提供的CameraManager获取相机管理实例，拿到设备的相机列表，一般分为前后两个。选择你要用的相机。
3.相机输出流
传入你选择的相机实例给cameraManager.createCameraInput创建相机输出流，开启会话后cameraInput.open，进行相机的参数配置（拍照还是摄像模式，闪光灯，焦距比）
4.配置相机会话信息
创建会话，将输入流，输出流，拍照，摄像，绑定到会话上。完事之后，开启会话，相机流就能正常输出。你去操作拍照摄像也可以正常操作。你可以理解会话为一个组合器。
5.录像操作
使用avRecorder进行录像的开启，暂停，释放的处理。
6.退出界面销毁相机
相机资源不释放，会导致再次初始化黑屏，甚至影响系统相机等异常问题。
三、DEMO源码示例：
import { camera } from '@kit.CameraKit';
import { image } from '@kit.ImageKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { media } from '@kit.MediaKit';
import { common } from '@kit.AbilityKit';
import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { fileIo as fs } from '@kit.CoreFileKit';export class CameraMgr {private TAG: string = "CameraMgr";private static mCameraMgr: CameraMgr | null = null;private mCameraInput: camera.CameraInput | undefined = undefined;private mPreviewOutput: camera.PreviewOutput | undefined = undefined;private mVideoSession: camera.VideoSession | undefined = undefined;private mVideoOutput: camera.VideoOutput | undefined = undefined;private mAvRecorder: media.AVRecorder | undefined = undefined;private mFile: fs.File | null = null;public static Ins(): CameraMgr {if (CameraMgr.mCameraMgr) {return CameraMgr.mCameraMgr}CameraMgr.mCameraMgr = new CameraMgr();return CameraMgr.mCameraMgr}/*** 初始化视频相机* @param context* @param surfaceId* @returns*/public async initVideoCamera(context: common.Context, surfaceId: string): Promise<void> {// 创建CameraManager对象let cameraManager: camera.CameraManager = camera.getCameraManager(context);if (!cameraManager) {console.error("camera.getCameraManager error");return;}// 监听相机状态变化cameraManager.on('cameraStatus', (err: BusinessError, cameraStatusInfo: camera.CameraStatusInfo) => {if (err !== undefined && err.code !== 0) {console.error('cameraStatus with errorCode = ' + err.code);return;}console.info(`camera : ${cameraStatusInfo.camera.cameraId}`);console.info(`status: ${cameraStatusInfo.status}`);});// 获取相机列表let cameraArray: Array<camera.CameraDevice> = [];try {cameraArray = cameraManager.getSupportedCameras();} catch (error) {let err = error as BusinessError;console.error(`getSupportedCameras call failed. error code: ${err.code}`);}if (cameraArray.length <= 0) {console.error("cameraManager.getSupportedCameras error");return;}// 获取支持的模式类型let sceneModes: Array<camera.SceneMode> = cameraManager.getSupportedSceneModes(cameraArray[0]);let isSupportVideoMode: boolean = sceneModes.indexOf(camera.SceneMode.NORMAL_VIDEO) >= 0;if (!isSupportVideoMode) {console.error('video mode not support');return;}// 获取相机设备支持的输出流能力let cameraOutputCap: camera.CameraOutputCapability =cameraManager.getSupportedOutputCapability(cameraArray[0], camera.SceneMode.NORMAL_VIDEO);if (!cameraOutputCap) {console.error("cameraManager.getSupportedOutputCapability error")return;}console.info("outputCapability: " + JSON.stringify(cameraOutputCap));let previewProfilesArray: Array<camera.Profile> = cameraOutputCap.previewProfiles;if (!previewProfilesArray) {console.error("createOutput previewProfilesArray == null || undefined");}let photoProfilesArray: Array<camera.Profile> = cameraOutputCap.photoProfiles;if (!photoProfilesArray) {console.error("createOutput photoProfilesArray == null || undefined");}let videoProfilesArray: Array<camera.VideoProfile> = cameraOutputCap.videoProfiles;if (!videoProfilesArray) {console.error("createOutput videoProfilesArray == null || undefined");}// videoProfile的宽高需要与AVRecorderProfile的宽高保持一致，并且需要使用AVRecorderProfile锁支持的宽高let videoSize: camera.Size = {width: 640,height: 480}let videoProfile: undefined | camera.VideoProfile = videoProfilesArray.find((profile: camera.VideoProfile) => {return profile.size.width === videoSize.width && profile.size.height === videoSize.height;});if (!videoProfile) {console.error('videoProfile is not found');return;}// 配置参数以实际硬件设备支持的范围为准let aVRecorderProfile: media.AVRecorderProfile = {audioBitrate: 48000,audioChannels: 2,audioCodec: media.CodecMimeType.AUDIO_AAC,audioSampleRate: 48000,fileFormat: media.ContainerFormatType.CFT_MPEG_4,videoBitrate: 2000000,videoCodec: media.CodecMimeType.VIDEO_AVC,videoFrameWidth: videoSize.width,videoFrameHeight: videoSize.height,videoFrameRate: 30};let options: photoAccessHelper.CreateOptions = {title: Date.now().toString()};let accessHelper: photoAccessHelper.PhotoAccessHelper = photoAccessHelper.getPhotoAccessHelper(context);let videoUri: string = await accessHelper.createAsset(photoAccessHelper.PhotoType.VIDEO, 'mp4', options);this.mFile = fs.openSync(videoUri, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);let aVRecorderConfig: media.AVRecorderConfig = {audioSourceType: media.AudioSourceType.AUDIO_SOURCE_TYPE_MIC,videoSourceType: media.VideoSourceType.VIDEO_SOURCE_TYPE_SURFACE_YUV,profile: aVRecorderProfile,url: `fd://${this.mFile.fd.toString()}`, // 文件需先由调用者创建，赋予读写权限，将文件fd传给此参数，eg.fd://45--file:///data/media/01.mp4rotation: 0, // 合理值0、90、180、270，非合理值prepare接口将报错location: { latitude: 30, longitude: 130 }};let avRecorder: media.AVRecorder | undefined = undefined;try {avRecorder = await media.createAVRecorder();} catch (error) {let err = error as BusinessError;console.error(`createAVRecorder call failed. error code: ${err.code}`);}if (avRecorder === undefined) {return;}this.mAvRecorder = avRecorder;try {await avRecorder.prepare(aVRecorderConfig);} catch (error) {let err = error as BusinessError;console.error(`prepare call failed. error code: ${err.code}`);}let videoSurfaceId: string | undefined = undefined; // 该surfaceID用于传递给相机接口创造videoOutputtry {videoSurfaceId = await avRecorder.getInputSurface();} catch (error) {let err = error as BusinessError;console.error(`getInputSurface call failed. error code: ${err.code}`);}if (videoSurfaceId === undefined) {return;}// 创建VideoOutput对象let videoOutput: camera.VideoOutput | undefined = undefined;try {videoOutput = cameraManager.createVideoOutput(videoProfile, videoSurfaceId);} catch (error) {let err = error as BusinessError;console.error(`Failed to create the videoOutput instance. error: ${JSON.stringify(err)}`);}if (videoOutput === undefined) {return;}this.mVideoOutput = videoOutput;// 监听视频输出错误信息videoOutput.on('error', (error: BusinessError) => {console.error(`Preview output error code: ${error.code}`);});//创建会话let videoSession: camera.VideoSession | undefined = undefined;try {videoSession = cameraManager.createSession(camera.SceneMode.NORMAL_VIDEO) as camera.VideoSession;} catch (error) {let err = error as BusinessError;console.error(`Failed to create the session instance. error: ${JSON.stringify(err)}`);}if (videoSession === undefined) {return;}this.mVideoSession = videoSession;// 监听session错误信息videoSession.on('error', (error: BusinessError) => {console.error(`Video session error code: ${error.code}`);});// 开始配置会话try {videoSession.beginConfig();} catch (error) {let err = error as BusinessError;console.error(`Failed to beginConfig. error: ${JSON.stringify(err)}`);}// 创建相机输入流let cameraInput: camera.CameraInput | undefined = undefined;try {cameraInput = cameraManager.createCameraInput(cameraArray[0]);} catch (error) {let err = error as BusinessError;console.error(`Failed to createCameraInput. error: ${JSON.stringify(err)}`);}if (cameraInput === undefined) {return;}this.mCameraInput = cameraInput;// 监听cameraInput错误信息let cameraDevice: camera.CameraDevice = cameraArray[0];cameraInput.on('error', cameraDevice, (error: BusinessError) => {console.error(`Camera input error code: ${error.code}`);});// 打开相机try {await cameraInput.open();} catch (error) {let err = error as BusinessError;console.error(`Failed to open cameraInput. error: ${JSON.stringify(err)}`);}// 向会话中添加相机输入流try {videoSession.addInput(cameraInput);} catch (error) {let err = error as BusinessError;console.error(`Failed to add cameraInput. error: ${JSON.stringify(err)}`);}// 创建预览输出流let previewOutput: camera.PreviewOutput | undefined = undefined;try {previewOutput = cameraManager.createPreviewOutput(previewProfilesArray[0], surfaceId);} catch (error) {let err = error as BusinessError;console.error(`Failed to create the PreviewOutput instance. error: ${JSON.stringify(err)}`);}if (previewOutput === undefined) {return;}// 向会话中添加预览输出流try {videoSession.addOutput(previewOutput);} catch (error) {let err = error as BusinessError;console.error(`Failed to add previewOutput. error: ${JSON.stringify(err)}`);}// 向会话中添加录像输出流try {videoSession.addOutput(videoOutput);} catch (error) {let err = error as BusinessError;console.error(`Failed to add videoOutput. error: ${JSON.stringify(err)}`);}// 提交会话配置try {await videoSession.commitConfig();} catch (error) {let err = error as BusinessError;console.error(`videoSession commitConfig error: ${JSON.stringify(err)}`);}// 启动会话try {await videoSession.start();} catch (error) {let err = error as BusinessError;console.error(`videoSession start error: ${JSON.stringify(err)}`);}}/*** 开始录像*/public async startRecord(){// 启动录像输出流this.mVideoOutput?.start((err: BusinessError) => {if (err) {console.error(`Failed to start the video output. error: ${JSON.stringify(err)}`);return;}console.info('Callback invoked to indicate the video output start success.');});// 开始录像try {await this.mAvRecorder?.start();} catch (error) {let err = error as BusinessError;console.error(`avRecorder start error: ${JSON.stringify(err)}`);}}/*** 停止录像*/public async stopRecorder(){// 停止录像输出流this.mVideoOutput?.stop((err: BusinessError) => {if (err) {console.error(`Failed to stop the video output. error: ${JSON.stringify(err)}`);return;}console.info('Callback invoked to indicate the video output stop success.');});// 停止录像try {await this.mAvRecorder?.stop();} catch (error) {let err = error as BusinessError;console.error(`avRecorder stop error: ${JSON.stringify(err)}`);}}public async destroyVideoCamera(){// 停止当前会话await this.mVideoSession?.stop();// 关闭文件fs.closeSync(this.mFile);// 释放相机输入流await this.mCameraInput?.close();// 释放预览输出流await this.mPreviewOutput?.release();// 释放录像输出流await this.mVideoOutput?.release();// 释放会话await this.mVideoSession?.release();// 会话置空this.mVideoSession = undefined;}
}