harmony 鸿蒙录像实现方案
录像实现方案
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
import camera from '@ohos.multimedia.camera';
import { BusinessError } from '@ohos.base';
import media from '@ohos.multimedia.media';
import common from '@ohos.app.ability.common';
async function videoRecording(baseContext: common.BaseContext, surfaceId: string): Promise<void> {
// 创建CameraManager对象
let cameraManager: camera.CameraManager = camera.getCameraManager(baseContext);
if (!cameraManager) {
console.error("camera.getCameraManager error");
return;
}
// 监听相机状态变化
cameraManager.on('cameraStatus', (err: BusinessError, cameraStatusInfo: camera.CameraStatusInfo) => {
console.log(`camera : ${cameraStatusInfo.camera.cameraId}`);
console.log(`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;
}
// 获取相机设备支持的输出流能力
let cameraOutputCap: camera.CameraOutputCapability = cameraManager.getSupportedOutputCapability(cameraArray[0]);
if (!cameraOutputCap) {
console.error("cameraManager.getSupportedOutputCapability error")
return;
}
console.log("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");
}
let metadataObjectTypesArray: Array<camera.MetadataObjectType> = cameraOutputCap.supportedMetadataObjectTypes;
if (!metadataObjectTypesArray) {
console.error("createOutput metadataObjectTypesArray == null||undefined");
}
// 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_MPEG4,
videoFrameWidth: 640,
videoFrameHeight: 480,
videoFrameRate: 30
};
let aVRecorderConfig: media.AVRecorderConfig = {
audioSourceType: media.AudioSourceType.AUDIO_SOURCE_TYPE_MIC,
videoSourceType: media.VideoSourceType.VIDEO_SOURCE_TYPE_SURFACE_YUV,
profile: aVRecorderProfile,
url: 'fd://', // 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(videoProfilesArray[0], 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.log(`Preview output error code: ${error.code}`);
});
//创建会话
let captureSession: camera.CaptureSession|undefined = undefined;
try {
captureSession = cameraManager.createCaptureSession();
} catch (error) {
let err = error as BusinessError;
console.error(`Failed to create the CaptureSession instance. error: ${JSON.stringify(err)}`);
}
if (captureSession === undefined) {
return;
}
// 监听session错误信息
captureSession.on('error', (error: BusinessError) => {
console.log(`Capture session error code: ${error.code}`);
});
// 开始配置会话
try {
captureSession.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.log(`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 {
captureSession.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入流
try {
captureSession.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 {
captureSession.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 captureSession.commitConfig();
} catch (error) {
let err = error as BusinessError;
console.error(`captureSession commitConfig error: ${JSON.stringify(err)}`);
}
// 启动会话
try {
await captureSession.start();
} catch (error) {
let err = error as BusinessError;
console.error(`captureSession 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.log('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.log('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
captureSession.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
captureSession.release();
// 会话置空
captureSession = undefined;
}
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