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add camera.md 

Signed-off-by: Ntongxu-liu1 <liutongxu@huawei.com>
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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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