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+# 相机开发指导
+
+## 场景介绍
+
+相机模块支持相机相关基础功能的开发，主要包括预览、拍照、录像等。本文将对相机各种基础功能的开发进行介绍说明。
+
+## 开发步骤
+
+### 接口说明
+
+详细API含义请参考：[相机管理API文档](../reference/apis/js-apis-camera.md)
+
+### 全流程场景
+
+包含流程：创建实例、参数设置、会话管理、拍照、录像、释放资源等。
+
+Xcomponent创建方法可参考：[XComponent创建方法]
+
+#### XComponent创建方法
+预览画面显示需要获取SurfaceId
+
+```js
+mXComponentController: XComponentController = new XComponentController                   //创建XComponentController
+
+build() {
+    Flex() {
+        XComponent({                                                                     //创建XComponent
+            id: '',
+            type: 'surface',
+            libraryname: '',
+            controller: this.mXComponentController
+        })
+        .onload(() => {                                                                  //设置onload回调
+            //设置Surface宽高（1920*1080）
+            this.mXComponentController.setXComponentSurfaceSize({surfaceWidth:1920,surfaceHeight:1080})
+            //获取Surface ID
+            globalThis.surfaceId = mXComponentController.getXComponentSurfaceId()
+        })
+        .width('1920px')                                                                 //设置XComponent宽度
+        .height('1080px')                                                                //设置XComponent高度
+    }
+}
+```
+
+#### 创建实例
+
+```js
+import camera from '@ohos.mutimedia.camera'
+import image from '@ohos.mutimedia.image'
+import media from '@ohos.mutimedia.media'
+import featureAbility from '@ohos.ability.featureAbility'
+
+//创建CameraManager对象
+let cameraManager
+await camera.getCameraManager(globalThis.Context, (err, manager) => {
+    if (err) {
+        console.error('Failed to get the CameraManager instance ${err.message}');
+        return;
+    }
+    console.log('Callback returned with the CameraManager instance');
+    cameraManager = manager
+})
+
+//注册回调函数监听相机状态变化，获取状态变化的相机信息
+cameraManager.on('cameraStatus', (cameraStatusInfo) => {
+    console.log('camera : ' + cameraStatusInfo.camera.cameraId);
+    console.log('status: ' + cameraStatusInfo.status);
+})
+
+//获取相机列表
+let cameraArray
+await cameraManager.getCameras((err, cameras) => {
+    if (err) {
+        console.error('Failed to get the cameras. ${err.message}');
+        return;
+    }
+    console.log('Callback returned with an array of supported cameras: ' + cameras.length);
+    cameraArray = cameras
+})
+
+ for(let cameraIndex = 0; cameraIndex < cameraArray.length; cameraIndex) {
+     console.log('cameraId : ' + cameraArray[cameraIndex].cameraId)                          //获取相机ID
+     console.log('cameraPosition : ' + cameraArray[cameraIndex].cameraPosition)              //获取相机位置
+     console.log('cameraType : ' + cameraArray[cameraIndex].cameraType)                      //获取相机类型
+     console.log('connectionType : ' + cameraArray[cameraIndex].connectionType)              //获取相机连接类型
+ }
+
+ //创建相机输入流
+ let cameraInput
+ await cameraManager.createCameraInput(cameraArray[0].cameraId).then((input) => {
+    console.log('Promise returned with the CameraInput instance');
+    cameraInput = input
+})
+
+//创建预览输出流
+let previewOutput
+camera.createPreviewOutput((globalThis.surfaceId), (err, output) => {
+    if (err) {
+        console.error('Failed to create the PreviewOutput instance. ${err.message}');
+        return;
+    }
+    console.log('Callback returned with previewOutput instance');
+    previewOutput = output
+});
+
+//创建ImageReceiver对象，并设置照片参数
+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
+camera.createPhotoOutput((photoSurfaceId), (err, output) => {
+    if (err) {
+        console.error('Failed to create the PhotoOutput instance. ${err.message}');
+        return;
+    }
+    console.log('Callback returned with the PhotoOutput instance.');
+    photoOutput = output
+});
+//保存照片
+```
+照片保存方法可参考：[照片保存方法示例]
+
+```js
+//创建视频录制的参数
+let videoProfile = {
+    audioBitrate : 48000,
+    audioChannels : 2,
+    audioCodec : 'audio/mp4a-latm',
+    audioSampleRate : 48000,
+    fileFormat : 'mp4',
+    videoBitrate : 48000,
+    videoCodec : 'video/mp4v-es',
+    videoFrameWidth : 640,
+    videoFrameHeight : 480,
+    videoFrameRate : 30
+}
+let videoConfig = {
+    audioSourceType : 1,
+    videoSourceType : 0,
+    profile : videoProfile,
+    url : 'file:///data/media/01.mp4',
+    orientationHint : 0,
+    location : { latitude : 30, longitude : 130 },
+}
+
+//创建录像输出流
+let videoRecorder
+await media.createVideoRecorder().then((recorder) => {
+    console.log('createVideoRecorder called')
+    videoRecorder = recorder
+})
+//设置视频录制的参数
+await videoRecorder.prepare(videoConfig)
+//获取录像SurfaceId
+await videoRecorder.getInputSurface().then((id) => {
+    console.log('getInputSurface called')
+    videoSurfaceId = id
+})
+```
+videoRecorder详细创建方法可参考：[视频录制开发指导](./video-recorder.md)
+```js
+//创建VideoOutput对象
+let videoOutput
+camera.createVideoOutput((surfaceId), (err, output) => {
+    if (err) {
+        console.error('Failed to create the VideoOutput instance. ${err.message}');
+        return;
+    }
+    console.log('Callback returned with the VideoOutput instance');
+    videoOutput = output
+});
+
+```
+
+#### 参数设置
+
+```js
+//判断设备是否支持闪光灯
+let flashStatus
+await cameraInput.hasFlash().then((status) => {
+    console.log('Promise returned with the flash light support status:' + status);
+    flashStatus = status
+})
+if(flashStatus) {
+    //判断是否支持自动闪光灯模式
+    let flashModeStatus
+    cameraInput.isFlashModeSupported(camera.FlashMode.FLASH_MODE_AUTO, (err, status) => {
+        if (err) {
+            console.error('Failed to check whether the flash mode is supported. ${err.message}');
+            return;
+        }
+        console.log('Callback returned with the flash mode support status: ' + status);
+        flashModeStatus = status
+    })
+    if(flashModeStatus) {
+        //设置自动闪光灯模式
+        cameraInput.setFlashMode(camera.FlashMode.FLASH_MODE_AUTO, (err) => {
+            if (err) {
+                console.error('Failed to set the flash mode  ${err.message}');
+                return;
+            }
+            console.log('Callback returned with the successful execution of setFlashMode.');
+        })
+    }
+}
+
+//判断是否支持连续自动变焦模式
+let focusModeStatus
+cameraInput.isFocusModeSupported(camera.FocusMode.FOCUS_MODE_CONTINUOUS_AUTO, (err, status) => {
+    if (err) {
+        console.error('Failed to check whether the focus mode is supported. ${err.message}');
+        return;
+    }
+    console.log('Callback returned with the focus mode support status: ' + status);
+    focusModeStatus = status
+})
+if(focusModeStatus) {
+    //设置连续自动变焦模式
+    cameraInput.setFocusMode(camera.FocusMode.FOCUS_MODE_CONTINUOUS_AUTO, (err) => {
+        if (err) {
+            console.error('Failed to set the focus mode  ${err.message}');
+            return;
+        }
+        console.log('Callback returned with the successful execution of setFocusMode.');
+    })
+}
+
+//获取相机支持的可变焦距比范围
+let zoomRatioRange
+cameraInput.getZoomRatioRange((err, range) => {
+    if (err) {
+        console.error('Failed to get the zoom ratio range. ${err.message}');
+        return;
+    }
+    console.log('Callback returned with zoom ratio range: ' + range.length);
+    zoomRatioRange = range
+})
+
+//设置可变焦距比
+cameraInput.setZoomRatio(zoomRatioRange[0], (err) => {
+    if (err) {
+        console.error('Failed to set the zoom ratio value ${err.message}');
+        return;
+    }
+    console.log('Callback returned with the successful execution of setZoomRatio.');
+})
+```
+
+#### 会话管理
+
+##### 创建会话
+
+```js
+//创建Context对象
+let context = featureAbility.getContext()
+
+//创建会话
+let captureSession
+await camera.createCaptureSession((context), (err, session) => {
+    if (err) {
+        console.error('Failed to create the CaptureSession instance. ${err.message}');
+        return;
+    }
+    console.log('Callback returned with the CaptureSession instance.' + session);
+    captureSession = session
+});
+
+//开始配置会话
+await captureSession.beginConfig((err) => {
+    if (err) {
+        console.error('Failed to start the configuration. ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate the begin config success.');
+});
+
+//向会话中添加相机输入流
+await captureSession.addInput(cameraInput, (err) => {
+    if (err) {
+        console.error('Failed to add the CameraInput instance. ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate that the CameraInput instance is added.');
+});
+
+//向会话中添加预览输入流
+await captureSession.addOutput(previewOutput, (err) => {
+    if (err) {
+        console.error('Failed to add the PreviewOutput instance ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate that the PreviewOutput instance is added.');
+});
+
+//向会话中添加拍照输出流
+await captureSession.addOutput(photoOutput, (err) => {
+    if (err) {
+        console.error('Failed to add the PhotoOutput instance ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate that the PhotoOutput instance is added.');
+});
+
+//提交会话配置
+await captureSession.commitConfig((err) => {
+    if (err) {
+        console.error('Failed to commit the configuration. ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate the commit config success.');
+});
+
+//启动会话
+await captureSession.start().then(() => {
+    console.log('Promise returned to indicate the session start success.');
+})
+```
+
+##### 切换会话
+
+```js
+//停止当前会话
+await captureSession.stop((err) => {
+    if (err) {
+        console.error('Failed to stop the session ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate the session stop success.');
+});
+
+//开始配置会话
+await captureSession.beginConfig((err) => {
+    if (err) {
+        console.error('Failed to start the configuration. ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate the begin config success.');
+});
+
+//从会话中移除拍照输出流
+await captureSession.removeOutput(photoOutput, (err) => {
+    if (err) {
+        console.error('Failed to remove the PhotoOutput instance. ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate that the PhotoOutput instance is removed.');
+});
+
+//向会话中添加录像输出流
+await captureSession.addOutput(videoOutput, (err) => {
+    if (err) {
+        console.error('Failed to add the VideoOutput instance ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate that the VideoOutput instance is added.');
+});
+
+//提交会话配置
+await captureSession.commitConfig((err) => {
+    if (err) {
+        console.error('Failed to commit the configuration. ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate the commit config success.');
+});
+
+//启动会话
+await captureSession.start().then(() => {
+    console.log('Promise returned to indicate the session start success.');
+})
+```
+
+#### 拍照
+
+```js
+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, (err) => {
+    if (err) {
+        console.error('Failed to capture the photo ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate the photo capture request success.');
+});
+```
+
+#### 录像
+
+```js
+//启动录像输出流
+videoOutput.start((err) => {
+    if (err) {
+        console.error('Failed to start the video output ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate the video output start success.');
+});
+
+//开始录像
+await videoRecorder.start().then(() => {
+    console.info('videoRecorder start success');
+}
+
+//停止录像
+await videoRecorder.stop().then(() => {
+    console.info('stop success');
+}
+
+//停止录像输出流
+await videoOutput.stop((err) => {
+    if (err) {
+        console.error('Failed to stop the video output ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate the video output stop success.');
+});
+```
+
+#### 释放资源
+
+```js
+//停止当前会话
+await captureSession.stop((err) => {
+    if (err) {
+        console.error('Failed to stop the session ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate the session stop success.');
+});
+//释放会话（自动释放输入流与输出流）
+await captureSession.release((err) => {
+    if (err) {
+        console.error('Failed to release the CaptureSession instance ${err.message}');
+        return;
+    }
+    console.log('Callback invoked to indicate that the CaptureSession instance is released successfully.');
+});
+```
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