MTK Camera自定义Vendor Tag

（1）Vendor Tag Structure

Google用一个 VendorTagSection 来描述一个 VendorTag，sectionName必须以供应商名称命名，例
如"com.mediatek.control.capture"。注意必须以 com 等开头，否则 CTS 测试会 Failed。

//hardware/interfaces/camera/common/1.0/types.halstruct VendorTagSection {string sectionName; // Section name; must be namespaced within vendor's namevec<VendorTag> tags; // List of tags in this section
};/*** A single vendor-unique metadata tag.* The full name of the tag is <sectionName>.<tagName>*/
struct VendorTag {uint32_t tagId; // Tag identifier, must be >= TagBoundaryId::VENDORstring tagName; // Name of tag, not including section nameCameraMetadataType tagType;
};enum CameraMetadataType : uint32_t {// Unsigned 8-bit integer (uint8_t)BYTE = 0,// Signed 32-bit integer (int32_t)INT32 = 1,// 32-bit float (float)FLOAT = 2,// Signed 64-bit integer (int64_t)INT64 = 3,// 64-bit float (double)DOUBLE = 4,// A 64-bit fraction (camera_metadata_rational_t)RATIONAL = 5
};

（2）How to add vendor tag

涉及的代码路径如下：

/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag.h
/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag_info.inl/vendor/mediatek/proprietary/hardware/mtkcam/utils/metadata/vendortag/VendorTagTable.h

添加 request 阶段的 control vendor tag（Eg：com.mediatek.control.capture.flipmode）

（A）在 mtk_metadata_tag.h 中的 mtk_camera_metadata_section 中定义 vendor tag 所属的 section
ID，需要定义在 MTK_VENDOR_TAG_SECTION 之后，如MTK_CONTROL_CAPTURE。

//vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag.htypedef enum mtk_camera_metadata_section {//...//vendor tagMTK_VENDOR_TAG_SECTION          = 0x8000,MTK_FACE_FEATURE                = 0,MTK_NR_FEATURE                  = 1,MTK_STEREO_FEATURE              = 2,MTK_HDR_FEATURE                 = 3,MTK_MFNR_FEATURE                = 4,MTK_CSHOT_FEATURE               = 5,MTK_3A_FEATURE                  = 6,MTK_EIS_FEATURE                 = 7,MTK_STREAMING_FEATURE           = 8,MTK_VSDOF_FEATURE               = 9,MTK_MULTI_CAM_FEATURE           = 10,MTK_CONTROL_CAPTURE             = 11, //MTK_CONTROL_CAPTUREMTK_BGSERVICE_FEATURE           = 12,MTK_CONFIGURE_SETTING           = 13,MTK_FLASH_FEATURE               = 14,MTK_SMVR_FEATURE                = 15,MTK_SINGLEHW_SETTING            = 16,MTK_ABF_FEATURE                 = 17,MTK_TRACKINGAF_FEATURE          = 18,MTK_AOVSERVICE_FEATURE          = 19,MTK_MDPTZ_FEATURE               = 20,//...
} mtk_camera_metadata_section_t;

（B）在 mtk_metadata_tag.h 中的 mtk_camera_metadata_section_start 中定义 vendor tag 所属的
section 的起始 ID，如MTK_CONTROL_CAPTURE_START。

//vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag.htypedef enum mtk_camera_metadata_section_start {//...MTK_STREAMING_FEATURE_START                 = (MTK_STREAMING_FEATURE + MTK_VENDOR_TAG_SECTION) << 16,MTK_VSDOF_FEATURE_START                     = (MTK_VSDOF_FEATURE + MTK_VENDOR_TAG_SECTION) << 16,MTK_MULTI_CAM_FEATURE_START                 = (MTK_MULTI_CAM_FEATURE + MTK_VENDOR_TAG_SECTION) << 16,MTK_CONTROL_CAPTURE_START                   = (MTK_CONTROL_CAPTURE + MTK_VENDOR_TAG_SECTION) << 16, //MTK_CONTROL_CAPTURE_STARTMTK_BGSERVICE_FEATURE_START                 = (MTK_BGSERVICE_FEATURE + MTK_VENDOR_TAG_SECTION) << 16,MTK_CONFIGURE_SETTING_START                 = (MTK_CONFIGURE_SETTING + MTK_VENDOR_TAG_SECTION) << 16,MTK_FLASH_FEATURE_START                     = (MTK_FLASH_FEATURE + MTK_VENDOR_TAG_SECTION) << 16,//...
} mtk_camera_metadata_section_start_t;

（C）在 mtk_metadata_tag.h 中的 mtk_camera_metadata_tag 中定义 vendor tag 的 ID，如MTK_CONTROL_CAPTURE_JPEG_FLIP_MODE。

如果需要再定义一个可以与 MTK_CONTROL_CAPTURE_JPEG_FLIP_MODE 归为同一个Section的Tag，则可以忽略第 1、2 步，直接在后面添加 vendor tag，如MTK_CONTROL_CAPTURE_POSTVIEW_SIZE，MTK_CONTROL_CAPTURE_ZSL_MODE等，最后在加上一个End tag（MTK_CONTROL_CAPTURE_END）。

//vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag.htypedef enum mtk_camera_metadata_tag {//...MTK_CONTROL_CAPTURE_EARLY_NOTIFICATION_SUPPORT  = MTK_CONTROL_CAPTURE_START,MTK_CONTROL_CAPTURE_EARLY_NOTIFICATION_TRIGGER,MTK_CONTROL_CAPTURE_NEXT_READY,MTK_CONTROL_CAPTURE_JPEG_FLIP_MODE,   //MTK_CONTROL_CAPTURE_JPEG_FLIP_MODEMTK_CONTROL_CAPTURE_AVAILABLE_POSTVIEW_MODES,MTK_CONTROL_CAPTURE_POSTVIEW_SIZE, //MTK_CONTROL_CAPTURE_POSTVIEW_SIZEMTK_CONTROL_CAPTURE_REMOSAIC_EN,MTK_CONTROL_CAPTURE_SEAMLESS_REMOSAIC_EN,MTK_CONTROL_CAPTURE_AVAILABLE_ZSL_MODES, MTK_CONTROL_CAPTURE_DEFAULT_ZSL_MODE,MTK_CONTROL_CAPTURE_ZSL_MODE, //MTK_CONTROL_CAPTURE_ZSL_MODE//...MTK_CONTROL_CAPTURE_END,
}mtk_camera_metadata_tag_t

（D）在 mtk_metadata_tag_info.inl 文件中定义vendor tag的类型与 tag name。如下所示，tag name 是 flipmode，value类型是MINT32。

//vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag_info.inl_IMP_TAG_INFO_( MTK_CONTROL_CAPTURE_EARLY_NOTIFICATION_SUPPORT,MINT32,     "early.notification.support")_IMP_TAG_INFO_( MTK_CONTROL_CAPTURE_EARLY_NOTIFICATION_TRIGGER,MINT32,     "early.notification.trigger")_IMP_TAG_INFO_( MTK_CONTROL_CAPTURE_NEXT_READY,MINT32,     "next.ready")_IMP_TAG_INFO_( MTK_CONTROL_CAPTURE_JPEG_FLIP_MODE,        //MTK_CONTROL_CAPTURE_JPEG_FLIP_MODEMINT32,     "flipmode")_IMP_TAG_INFO_( MTK_CONTROL_CAPTURE_POSTVIEW_SIZE,MSize,      "postviewsize")_IMP_TAG_INFO_( MTK_CONTROL_CAPTURE_AVAILABLE_ZSL_MODES,MUINT8,     "availableZslModes")_IMP_TAG_INFO_( MTK_CONTROL_CAPTURE_DEFAULT_ZSL_MODE,MUINT8,     "defaultZslMode")_IMP_TAG_INFO_( MTK_CONTROL_CAPTURE_ZSL_MODE,MUINT8,     "zslMode")//...

（E）在 VendorTagTable.h 文件中定义 section name 以及这一 SECTION 包含的 vendor tag。
如下所示，section name 是"com.mediatek.control.capture"，包含了从 MTK_CONTROL_CAPTURE_START至MTK_CONTROL_CAPTURE_END间的vendor tag。

//vendor/mediatek/proprietary/hardware/mtkcam/utils/metadata/vendortag/VendorTagTable.hstatic auto& _ControlCapture_()
{static const std::map<uint32_t, VendorTag_t>sInst = {_TAG_(MTK_CONTROL_CAPTURE_EARLY_NOTIFICATION_SUPPORT,"early.notification.support",    TYPE_INT32),_TAG_(MTK_CONTROL_CAPTURE_EARLY_NOTIFICATION_TRIGGER,"early.notification.trigger",    TYPE_INT32),_TAG_(MTK_CONTROL_CAPTURE_NEXT_READY,"next.ready",    TYPE_INT32),_TAG_(MTK_CONTROL_CAPTURE_JPEG_FLIP_MODE,      //MTK_CONTROL_CAPTURE_JPEG_FLIP_MODE"flipmode",     TYPE_INT32),_TAG_(MTK_CONTROL_CAPTURE_AVAILABLE_POSTVIEW_MODES,"availablepostviewmodes",    TYPE_INT32),_TAG_(MTK_CONTROL_CAPTURE_POSTVIEW_SIZE,"postviewsize",    TYPE_INT32),_TAG_(MTK_CONTROL_CAPTURE_AVAILABLE_ZSL_MODES,"available.zsl.modes",    TYPE_BYTE),_TAG_(MTK_CONTROL_CAPTURE_DEFAULT_ZSL_MODE,"default.zsl.mode",    TYPE_BYTE),_TAG_(MTK_CONTROL_CAPTURE_ZSL_MODE,"zsl.mode",    TYPE_BYTE),//...};return sInst;
}static auto& getGlobalSections()
{static std::vector<VendorTagSection_t>sMTKSections = {_SECTION_( "com.mediatek.control.capture",MTK_CONTROL_CAPTURE_START,MTK_CONTROL_CAPTURE_END,_ControlCapture_() ),//...}return sGlobalSections;
}

然后,通过_ControlCapture_将section name 与 tag name绑定起来，一个完整的vendor tag ID 是 MTK_CONTROL_CAPTURE_JPEG_FLIP_MODE，value 类型是 MINT32，即：

name = section name + tag name = com.mediatek.control.capture + flipmode

（3）App当中如何使用Vendor Tag

（A）水印WaterMark

CaptureRequest.Key<int[]> mWaterMarkValue =  new CaptureRequest.Key<int[]>("com.mediatek.control.capture.hctHalWatermakr", int[].class);private static final int[] HAL_WATERMARK_VALUE = new int[]{0};if(Config.HalWaterMarkSupport()){if(WATERMARK_ON.equals(mWaterMark.getValue())){HAL_WATERMARK_VALUE[0] = 1;}else{HAL_WATERMARK_VALUE[0] = 0;}captureBuilder.set(mWaterMarkValue, HAL_WATERMARK_VALUE);
}

（B）Mirror效果

private static final String FLIP_KEY_MODE_REQUEST = "com.mediatek.control.capture.flipmode";
private CaptureRequest.Key<int[]> mKeyFlipMode;List<CaptureRequest.Key<?>> requestKeyList = cs.getAvailableCaptureRequestKeys();for (CaptureRequest.Key<?> requestKey : requestKeyList) {if (requestKey.getName().equals(FLIP_KEY_MODE_REQUEST)){mKeyFlipMode = (CaptureRequest.Key<int[]>) requestKey;}}if (value != null && captureBuilder != null) {int[] mode = new int[1];mode[0] = Integer.parseInt(value);captureBuilder.set(mKeyFlipMode, mode);
}

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