鸿蒙NEXT开发实战往期必看文章:
一分钟了解”纯血版!鸿蒙HarmonyOS Next应用开发!
“非常详细的” 鸿蒙HarmonyOS Next应用开发学习路线!(从零基础入门到精通)
HarmonyOS NEXT应用开发案例实践总结合(持续更新......)
HarmonyOS NEXT应用开发性能优化实践总结(持续更新......)
当前示例提供完整的录像流程介绍,方便开发者了解完整的接口调用顺序。
在参考以下示例前,建议开发者查看相机开发指导(ArkTS)的具体章节,了解设备输入、会话管理、录像等单个流程。
开发流程
在获取到相机支持的输出流能力后,开始创建录像流,开发流程如下。
完整示例
Context获取方式请参考:获取UIAbility的上下文信息。
import { camera } from '@kit.CameraKit';
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';
async function videoRecording(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);
let file: fs.File = 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://${file.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.mp4
rotation: 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;
}
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videoOutput
try {
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;
}
// 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;
}
// 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;
}
// 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,其中参数 surfaceId 参考下面 XComponent 组件,预览流为XComponent组件提供的surface
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)}`);
}
// 启动录像输出流
videoOutput.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 avRecorder.start();
} catch (error) {
let err = error as BusinessError;
console.error(`avRecorder start error: ${JSON.stringify(err)}`);
}
// 停止录像输出流
videoOutput.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 avRecorder.stop();
} catch (error) {
let err = error as BusinessError;
console.error(`avRecorder stop error: ${JSON.stringify(err)}`);
}
// 停止当前会话
await videoSession.stop();
// 关闭文件
fs.closeSync(file);
// 释放相机输入流
await cameraInput.close();
// 释放预览输出流
await previewOutput.release();
// 释放录像输出流
await videoOutput.release();
// 释放会话
await videoSession.release();
// 会话置空
videoSession = undefined;
}
标签:ArkTS,console,进阶,err,HarmonyOS,let,error,BusinessError,undefined
From: https://blog.csdn.net/wea22984984/article/details/143628248