拍照实现方案
开发流程
在获取到相机支持的输出流能力后,开始创建拍照流,开发流程如下。
完整示例
import camera from '@ohos.multimedia.camera'
import image from '@ohos.multimedia.image'
import media from '@ohos.multimedia.media'
// 创建CameraManager对象
context: any = getContext(this)
let cameraManager = camera.getCameraManager(this.context)
if (!cameraManager) {
console.error("camera.getCameraManager error")
return;
}
// 监听相机状态变化
cameraManager.on('cameraStatus', (cameraStatusInfo) => {
console.info(`camera : ${cameraStatusInfo.camera.cameraId}`);
console.info(`status: ${cameraStatusInfo.status}`);
})
// 获取相机列表
let cameraArray = cameraManager.getSupportedCameras();
if (cameraArray.length <= 0) {
console.error("cameraManager.getSupportedCameras error")
return;
}
for (let index = 0; index < cameraArray.length; index++) {
console.info('cameraId : ' + cameraArray[index].cameraId); // 获取相机ID
console.info('cameraPosition : ' + cameraArray[index].cameraPosition); // 获取相机位置
console.info('cameraType : ' + cameraArray[index].cameraType); // 获取相机类型
console.info('connectionType : ' + cameraArray[index].connectionType); // 获取相机连接类型
}
// 创建相机输入流
let cameraInput
try {
cameraInput = cameraManager.createCameraInput(cameraArray[0]);
} catch (error) {
console.error('Failed to createCameraInput errorCode = ' + error.code);
}
// 监听cameraInput错误信息
let cameraDevice = cameraArray[0];
cameraInput.on('error', cameraDevice, (error) => {
console.info(`Camera input error code: ${error.code}`);
})
// 打开相机
await cameraInput.open();
// 获取相机设备支持的输出流能力
let cameraOutputCap = cameraManager.getSupportedOutputCapability(cameraArray[0]);
if (!cameraOutputCap) {
console.error("cameraManager.getSupportedOutputCapability error")
return;
}
console.info("outputCapability: " + JSON.stringify(cameraOutputCap));
let previewProfilesArray = cameraOutputCap.previewProfiles;
if (!previewProfilesArray) {
console.error("createOutput previewProfilesArray == null || undefined")
}
let photoProfilesArray = cameraOutputCap.photoProfiles;
if (!photoProfilesArray) {
console.error("createOutput photoProfilesArray == null || undefined")
}
// 创建预览输出流,其中参数 surfaceId 参考上文 XComponent 组件,预览流为XComponent组件提供的surface
let previewOutput
try {
previewOutput = cameraManager.createPreviewOutput(previewProfilesArray[0], surfaceId)
} catch (error) {
console.error("Failed to create the PreviewOutput instance.")
}
// 监听预览输出错误信息
previewOutput.on('error', (error) => {
console.info(`Preview output error code: ${error.code}`);
})
// 创建ImageReceiver对象,并设置照片参数:分辨率大小是根据前面 photoProfilesArray 获取的当前设备所支持的拍照分辨率大小去设置
let imageReceiver = await image.createImageReceiver(1920, 1080, 4, 8)
// 获取照片显示SurfaceId
let photoSurfaceId = await imageReceiver.getReceivingSurfaceId()
// 创建拍照输出流
let photoOutput
try {
photoOutput = cameraManager.createPhotoOutput(photoProfilesArray[0], photoSurfaceId)
} catch (error) {
console.error('Failed to createPhotoOutput errorCode = ' + error.code);
}
//创建会话
let captureSession
try {
captureSession = cameraManager.createCaptureSession()
} catch (error) {
console.error('Failed to create the CaptureSession instance. errorCode = ' + error.code);
}
// 监听session错误信息
captureSession.on('error', (error) => {
console.info(`Capture session error code: ${error.code}`);
})
// 开始配置会话
try {
captureSession.beginConfig()
} catch (error) {
console.error('Failed to beginConfig. errorCode = ' + error.code);
}
// 向会话中添加相机输入流
try {
captureSession.addInput(cameraInput)
} catch (error) {
console.error('Failed to addInput. errorCode = ' + error.code);
}
// 向会话中添加预览输出流
try {
captureSession.addOutput(previewOutput)
} catch (error) {
console.error('Failed to addOutput(previewOutput). errorCode = ' + error.code);
}
// 向会话中添加拍照输出流
try {
captureSession.addOutput(photoOutput)
} catch (error) {
console.error('Failed to addOutput(photoOutput). errorCode = ' + error.code);
}
// 提交会话配置
await captureSession.commitConfig()
// 启动会话
await captureSession.start().then(() => {
console.info('Promise returned to indicate the session start success.');
})
// 判断设备是否支持闪光灯
let flashStatus
try {
flashStatus = captureSession.hasFlash()
} catch (error) {
console.error('Failed to hasFlash. errorCode = ' + error.code);
}
console.info('Promise returned with the flash light support status:' + flashStatus);
if (flashStatus) {
// 判断是否支持自动闪光灯模式
let flashModeStatus
try {
let status = captureSession.isFlashModeSupported(camera.FlashMode.FLASH_MODE_AUTO)
flashModeStatus = status
} catch (error) {
console.error('Failed to check whether the flash mode is supported. errorCode = ' + error.code);
}
if(flashModeStatus) {
// 设置自动闪光灯模式
try {
captureSession.setFlashMode(camera.FlashMode.FLASH_MODE_AUTO)
} catch (error) {
console.error('Failed to set the flash mode. errorCode = ' + error.code);
}
}
}
// 判断是否支持连续自动变焦模式
let focusModeStatus
try {
let status = captureSession.isFocusModeSupported(camera.FocusMode.FOCUS_MODE_CONTINUOUS_AUTO)
focusModeStatus = status
} catch (error) {
console.error('Failed to check whether the focus mode is supported. errorCode = ' + error.code);
}
if (focusModeStatus) {
// 设置连续自动变焦模式
try {
captureSession.setFocusMode(camera.FocusMode.FOCUS_MODE_CONTINUOUS_AUTO)
} catch (error) {
console.error('Failed to set the focus mode. errorCode = ' + error.code);
}
}
// 获取相机支持的可变焦距比范围
let zoomRatioRange
try {
zoomRatioRange = captureSession.getZoomRatioRange()
} catch (error) {
console.error('Failed to get the zoom ratio range. errorCode = ' + error.code);
}
// 设置可变焦距比
try {
captureSession.setZoomRatio(zoomRatioRange[0])
} catch (error) {
console.error('Failed to set the zoom ratio value. errorCode = ' + error.code);
}
let settings = {
quality: camera.QualityLevel.QUALITY_LEVEL_HIGH, // 设置图片质量高
rotation: camera.ImageRotation.ROTATION_0 // 设置图片旋转角度0
}
// 使用当前拍照设置进行拍照
photoOutput.capture(settings, async (err) => {
if (err) {
console.error('Failed to capture the photo ${err.message}');
return;
}
console.info('Callback invoked to indicate the photo capture request success.');
});
// 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()
// 释放拍照输出流
photoOutput.release()
// 释放会话
captureSession.release()
// 会话置空
captureSession = null