harmony 鸿蒙Camera Recording Sample
Camera Recording Sample
Development Process
After obtaining the output stream capabilities supported by the camera, create a video stream. The development process is as follows:
Sample Code
For details about how to obtain the BaseContext, see BaseContext.
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> {
// Create a CameraManager instance.
let cameraManager: camera.CameraManager = camera.getCameraManager(baseContext);
if (!cameraManager) {
console.error("camera.getCameraManager error");
return;
}
// Listen for camera status changes.
cameraManager.on('cameraStatus', (err: BusinessError, cameraStatusInfo: camera.CameraStatusInfo) => {
console.log(`camera : ${cameraStatusInfo.camera.cameraId}`);
console.log(`status: ${cameraStatusInfo.status}`);
});
// Obtain the camera list.
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;
}
// Obtain the output stream capabilities supported by the camera.
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");
}
// Configure the parameters based on those supported by the hardware device.
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://', // Before passing in a file descriptor to this parameter, the file must be created by the caller and granted with the read and write permissions. Example value: fd://45--file:///data/media/01.mp4.
rotation: 0, // The value can be 0, 90, 180, or 270. If any other value is used, prepare() reports an error.
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; // The surfaceID is passed in to the camera API to create a VideoOutput instance.
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;
}
// Create a VideoOutput instance.
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;
}
// Listen for video output errors.
videoOutput.on('error', (error: BusinessError) => {
console.log(`Preview output error code: ${error.code}`);
});
// Create a session.
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;
}
// Listen for session errors.
captureSession.on('error', (error: BusinessError) => {
console.log(`Capture session error code: ${error.code}`);
});
// Start configuration for the session.
try {
captureSession.beginConfig();
} catch (error) {
let err = error as BusinessError;
console.error(`Failed to beginConfig. error: ${JSON.stringify(err)}`);
}
// Create a camera input stream.
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;
}
// Listen for camera input errors.
let cameraDevice: camera.CameraDevice = cameraArray[0];
cameraInput.on('error', cameraDevice, (error: BusinessError) => {
console.log(`Camera input error code: ${error.code}`);
});
// Open the camera.
try {
await cameraInput.open();
} catch (error) {
let err = error as BusinessError;
console.error(`Failed to open cameraInput. error: ${JSON.stringify(err)}`);
}
// Add the camera input stream to the session.
try {
captureSession.addInput(cameraInput);
} catch (error) {
let err = error as BusinessError;
console.error(`Failed to add cameraInput. error: ${JSON.stringify(err)}`);
}
// Create a preview output stream. For details about the surfaceId parameter, see the XComponent. The preview stream is the surface provided by the XComponent.
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;
}
// Add the preview input stream to the session.
try {
captureSession.addOutput(previewOutput);
} catch (error) {
let err = error as BusinessError;
console.error(`Failed to add previewOutput. error: ${JSON.stringify(err)}`);
}
// Add a video output stream to the session.
try {
captureSession.addOutput(videoOutput);
} catch (error) {
let err = error as BusinessError;
console.error(`Failed to add videoOutput. error: ${JSON.stringify(err)}`);
}
// Commit the session configuration.
try {
await captureSession.commitConfig();
} catch (error) {
let err = error as BusinessError;
console.error(`captureSession commitConfig error: ${JSON.stringify(err)}`);
}
// Start the session.
try {
await captureSession.start();
} catch (error) {
let err = error as BusinessError;
console.error(`captureSession start error: ${JSON.stringify(err)}`);
}
// Start the video output stream.
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.');
});
// Start video recording.
try {
await avRecorder.start();
} catch (error) {
let err = error as BusinessError;
console.error(`avRecorder start error: ${JSON.stringify(err)}`);
}
// Stop the video output stream.
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.');
});
// Stop video recording.
try {
await avRecorder.stop();
} catch (error) {
let err = error as BusinessError;
console.error(`avRecorder stop error: ${JSON.stringify(err)}`);
}
// Stop the session.
captureSession.stop();
// Release the camera input stream.
cameraInput.close();
// Release the preview output stream.
previewOutput.release();
// Release the video output stream.
videoOutput.release();
// Release the session.
captureSession.release();
// Set the session to null.
captureSession = undefined;
}
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