（1）源码

//vendor/mediatek/proprietary/hardware/mtkcam/drv/src/sensor/common/v1/HalSensorList.buildStaticInfo.cpp

MBOOL
HalSensorList::
buildStaticInfo(Info const& rInfo, IMetadata& rMetadata) const
{
    SensorStaticInfo     *pSensorStaticInfo = &sensorStaticInfo[rInfo.getDeviceId()];
    MUINT8 u8Para = 0;

    if  (!impBuildStaticInfo(rInfo, rMetadata))
    {
        MY_LOGE(
            "Fail to build static info for %s index:%d type:%d",
            rInfo.getSensorDrvName().string(), rInfo.getDeviceId(), rInfo.getSensorType()
        );
        //return  MFALSE;
    }

lbLoadDone:
    /*METEDATA Ref  //system/media/camera/docs/docs.html*/
    //using full size
    {
        IMetadata::IEntry entryA(MTK_SENSOR_INFO_ACTIVE_ARRAY_REGION);
        MRect region1(MPoint(pSensorStaticInfo->SensorGrabStartX_CAP,pSensorStaticInfo->SensorGrabStartY_CAP), MSize(pSensorStaticInfo->captureWidth,pSensorStaticInfo->captureHeight));
        entryA.push_back(region1, Type2Type<MRect>());
        rMetadata.update(MTK_SENSOR_INFO_ACTIVE_ARRAY_REGION, entryA);

        MY_LOGD("MTK_SENSOR_INFO_ACTIVE_ARRAY_REGION(%d, %d, %d, %d)", pSensorStaticInfo->SensorGrabStartX_CAP, pSensorStaticInfo->SensorGrabStartY_CAP,
            pSensorStaticInfo->captureWidth, pSensorStaticInfo->captureHeight);
    }
    //using full size(No correction)
    {
        IMetadata::IEntry entryA(MTK_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE);
        entryA.push_back(pSensorStaticInfo->SensorGrabStartX_CAP, Type2Type<MINT32>());
        entryA.push_back(pSensorStaticInfo->SensorGrabStartY_CAP, Type2Type<MINT32>());
        entryA.push_back(pSensorStaticInfo->captureWidth, Type2Type<MINT32>());
        entryA.push_back(pSensorStaticInfo->captureHeight, Type2Type<MINT32>());
        rMetadata.update(MTK_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, entryA);

        MY_LOGD("MTK_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE(%d, %d, %d, %d)", pSensorStaticInfo->SensorGrabStartX_CAP, pSensorStaticInfo->SensorGrabStartY_CAP,
            pSensorStaticInfo->captureWidth, pSensorStaticInfo->captureHeight);
    }
    //Pixel arry
    {
        SensorDrv *const pSensorDrv = SensorDrv::get();
        MUINT32 scenario = MSDK_SCENARIO_ID_CAMERA_CAPTURE_JPEG; /*capture mode*/
        SensorCropWinInfo rSensorCropInfo;

        ::memset(&rSensorCropInfo, 0, sizeof(SensorCropWinInfo));
        pSensorDrv->sendCommand((IMGSENSOR_SENSOR_IDX) rInfo.getDeviceId(),
                CMD_SENSOR_GET_SENSOR_CROP_WIN_INFO,
                (MUINTPTR)&scenario,
                (MUINTPTR)&rSensorCropInfo,
                0);

//（1）这里可以更新sensor pixel array size
        IMetadata::IEntry entryA(MTK_SENSOR_INFO_PIXEL_ARRAY_SIZE);
+	if(rSensorCropInfo.full_w == 1600 && rSensorCropInfo.full_h == 1200){
+		rSensorCropInfo.full_w = 1640;
+		rSensorCropInfo.full_h = 1230;
+	}
        MSize Size1(rSensorCropInfo.full_w, rSensorCropInfo.full_h);
        entryA.push_back(Size1, Type2Type<MSize>());
        rMetadata.update(MTK_SENSOR_INFO_PIXEL_ARRAY_SIZE, entryA);
    }
    
    //Color filter
    {
        IMetadata::IEntry entryA(MTK_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT);
        switch(pSensorStaticInfo->sensorFormatOrder) {
            case SENSOR_FORMAT_ORDER_RAW_B:
                u8Para = 0x3;//BGGR
                break;
            case SENSOR_FORMAT_ORDER_RAW_Gb:
                u8Para = 0x2;//GBRG
                break;
            case SENSOR_FORMAT_ORDER_RAW_Gr:
                u8Para = 0x1;//GRBG
                break;
            case SENSOR_FORMAT_ORDER_RAW_R:
                u8Para = 0x0;//RGGB
                break;
            default:
                u8Para = 0x4;//BGR not bayer
                break;
        }
        entryA.push_back(u8Para, Type2Type<MUINT8>());
        rMetadata.update(MTK_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT, entryA);
    }
    //Orientation
    {
	
		//（2）更新MTK_SENSOR_INFO_ORIENTATION
        IMetadata::IEntry entryA(MTK_SENSOR_INFO_ORIENTATION);
        entryA.push_back((MINT32)pSensorStaticInfo->orientationAngle, Type2Type<MINT32>());
        rMetadata.update(MTK_SENSOR_INFO_ORIENTATION, entryA);

        // IMetadata::IEntry entryB(MTK_SENSOR_INFO_WANTED_ORIENTATION);
        // entryB.push_back((MINT32)pSensorStaticInfo->orientationAngle, Type2Type<MINT32>());
        // rMetadata.update(MTK_SENSOR_INFO_WANTED_ORIENTATION, entryB);
    }
    //AOSP Orientation & Facing
    {
	
		//（3）更新MTK_SENSOR_ORIENTATION
        IMetadata::IEntry entryA(MTK_SENSOR_ORIENTATION);
        entryA.push_back((MINT32)pSensorStaticInfo->orientationAngle, Type2Type<MINT32>());
        rMetadata.update(MTK_SENSOR_ORIENTATION, entryA);

		//（4）更新MTK_LENS_FACING信息
        IMetadata::IEntry entryB(MTK_LENS_FACING);
        if ( pSensorStaticInfo->facingDirection==0 )
            entryB.push_back(MTK_LENS_FACING_BACK, Type2Type<MUINT8>());
        else
            entryB.push_back(MTK_LENS_FACING_FRONT, Type2Type<MUINT8>());
        rMetadata.update(MTK_LENS_FACING, entryB);
    }

    //Sensor manual add tag list
    {
        IMetadata::IEntry entryA(MTK_MULTI_CAM_FEATURE_SENSOR_MANUAL_UPDATED);
        entryA.push_back((MINT64)MTK_SENSOR_INFO_ACTIVE_ARRAY_REGION, Type2Type<MINT64>());
        entryA.push_back((MINT64)MTK_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, Type2Type<MINT64>());
        entryA.push_back((MINT64)MTK_SENSOR_INFO_PIXEL_ARRAY_SIZE, Type2Type<MINT64>());
        entryA.push_back((MINT64)MTK_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT, Type2Type<MINT64>());
        entryA.push_back((MINT64)MTK_SENSOR_INFO_ORIENTATION, Type2Type<MINT64>());
        entryA.push_back((MINT64)MTK_SENSOR_INFO_WANTED_ORIENTATION, Type2Type<MINT64>());
        entryA.push_back((MINT64)MTK_SENSOR_ORIENTATION, Type2Type<MINT64>());
        entryA.push_back((MINT64)MTK_LENS_FACING, Type2Type<MINT64>());
        entryA.push_back((MINT64)MTK_CONTROL_AF_AVAILABLE_MODES, Type2Type<MINT64>());
        entryA.push_back((MINT64)MTK_CONTROL_MAX_REGIONS, Type2Type<MINT64>());
        rMetadata.update(MTK_MULTI_CAM_FEATURE_SENSOR_MANUAL_UPDATED, entryA);
    }

    rMetadata.sort();

    return  MTRUE;
}

以上信息可以在运行的过程中来更新Metadata的值，比如可以参考这篇文章的使用CTS测试中testAvailableStreamConfigs[1]项。