应用设置CONTROL_SCENE_MODE_FACE_PRIORITY设置不生效

问题：

app 代码

CaptureRequest.Builder captureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);builder.set(CaptureRequest.CONTROL_SCENE_MODE, CameraMetadata.CONTROL_SCENE_MODE_FACE_PRIORITY);

这样设置完成以后 ，发现scene一直是0，正常应该是18
底层关于Scene如下
\HLOS\vendor\qcom\proprietary\chi-cdk\api\common\chituningmodeparam.h

enum class ChiModeSceneSubModeType
{None          = 0,Landscape     = 1,Snow          = 2,Beach         = 3,Sunset        = 4,Night         = 5,Portrait      = 6,BackLight     = 7,Sports        = 8,AntiShake     = 9,Flowers       = 10,CandleLight   = 11,Fireworks     = 12,Party         = 13,NightPortrait = 14,Theater       = 15,Action        = 16,AR            = 17,FacePriority  = 18,Barcode       = 19,BestShot      = 20
};

原因分析

需要ANDROID_CONTROL_MODE_USE_SCENE_MODE == controlModeValue 才会赋值

解决

应用需要先设置CONTROL_MODE_USE_SCENE_MODE

builder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_USE_SCENE_MODE);
builder.set(CaptureRequest.CONTROL_SCENE_MODE, CameraMetadata.CONTROL_SCENE_MODE_FACE_PRIORITY);