MTK HAL算法集成之单帧算法

引言

为了给用户提供更好的成像效果，现在的手机都会接入一些第三方的图像处理算法。MTK平台的HAL3也在P2这一层提供接入的plugin。按图像处理算法需要的帧数和摄像头数量，大体可以分为三类：

单帧算法：
常见的单帧算法有：美颜算法(瘦脸、磨皮、大眼)、广角镜头畸变校正算法、附加表情算法、单摄背景虚化算法(伪双摄算法)等等，仅需单帧图像输入的算法都属于单帧算法。一般情况下，输入一帧图像，算法处理完输出一帧处理后的图像。
多帧算法：
常见的多帧算法有：MFNR（多帧降噪）、HDR（高动态范围）等等，需要连续多帧图像输入的算法都属于多帧算法。一般情况下，输入连续多帧图像，算法处理完输出一帧处理后的图像。
双摄算法：
最常见的双摄算法是双摄景深算法或者叫双摄背景虚化算法，除此之外，也有彩色+黑白用于增强夜拍效果的双摄算法。单帧算法和多帧算法仅需要获取一个摄像头的图像。而双摄算法需要获取主、辅两个摄像头的图像，并且一般还会要求主、辅摄像头同步。分别获取主、辅摄像头的两帧同步图像，处理后输出一帧主摄图像，用户也仅能看到主摄图像。

根据这个大体上的分类，MTK HAL算法集成系列文章共三篇：

本文是其中的第一篇。这个系列文章均基于Android 9.0，MT6763平台，HAL版本是HAL3。

1. 算法集成前的准备

在开展集成工作之前，首先要对算法有一个基本的评估，并且对于集成也应有一定的要求。

1. 1 算法要求及评估

处理效果好，不能比竞品差，超过竞品更佳。（这条和camera调试的主观效果一样，主观性较强，往往一厢情愿，具体看项目要求吧）
各个场景及压力测试下效果稳定。
处理后照片无色差、锐度和饱和度无损失，或者损失在可接受范围。
达到可接受的分辨率，最好可达到摄像头的最大分辨率。
处理时间越快越好，不超过竞品时间、不超过项目和产品的目标时间。
无内存泄露，占用内存少。
提供必要的集成说明文档，包括算法类型、输入及输出图像要求、输入参数要求等等。

注意：如果有条件，处理时间、内存占用、分辨率等等可量化的指标可要求算法提供方给出具体的参考数据，以便集成完后测试验证。

1.2 算法集成要求

编译时可根据项目控制是否集成算法。
运行时可以用参数控制是否启用算法。
集成算法库正常运行、压力测试下效果稳定、无内存泄露。

1.3 算法集成的步骤

(1). 根据算法选择feature类型，如果与MTK提供的feature不能对号入座，则需要添加自定义feature。
(2). 将算法对应的feature类型添加到scenario配置表。
(3). 根据算法选择plugin类型，编写CPP文件实现plugin，挂载算法。
(4). 如果算法不能复用Android和MTK提供的metadata，则还需要为算法配置自定义的metadata以便APP控制是否启用算法。

首先，我准备了一个libwatermark.so，它仅仅实现了一个添加水印的功能，用它来模拟第三方的单帧算法库。如果想了解添加水印的实现代码，可以参考我另外一篇文章：Android 实现图片加水印或logo。接下来，我们就按照集成步骤，逐步详细讲解。

2. 为算法选择feature

2.1 MTK提供的feature

MTK在mtk_feature_type.h和customer_feature_type.h已经提供了一些feature。
vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/3rdparty/mtk/mtk_feature_type.h：

    NO_FEATURE_NORMAL       = 0ULL,
    // MTK (bit 0-31)
    MTK_FEATURE_MFNR        = 1ULL << 0,
    MTK_FEATURE_HDR         = 1ULL << 1,
    MTK_FEATURE_REMOSAIC    = 1ULL << 2,
    MTK_FEATURE_ABF         = 1ULL << 3,
    MTK_FEATURE_NR          = 1ULL << 4,
    MTK_FEATURE_FB          = 1ULL << 5,
    MTK_FEATURE_CZ          = 1ULL << 6,
    MTK_FEATURE_DRE         = 1ULL << 7,
    MTK_FEATURE_DEPTH       = 1ULL << 8,
    MTK_FEATURE_BOKEH       = 1ULL << 9,
    MTK_FEATURE_VSDOF       = (MTK_FEATURE_DEPTH|MTK_FEATURE_BOKEH),
    MTK_FEATURE_FSC         = 1ULL << 10,
    MTK_FEATURE_3DNR        = 1ULL << 11,
    MTK_FEATURE_EIS         = 1ULL << 12,
    MTK_FEATURE_AINR        = 1ULL << 13,
    MTK_FEATURE_DUAL_YUV    = 1ULL << 14,
    MTK_FEATURE_DUAL_HWDEPTH  = 1ULL << 15,
    MTK_FEATURE_AIS         = 1ULL << 16,
    MTK_FEATURE_HFG         = 1ULL << 17,
    MTK_FEATURE_DCE         = 1ULL << 18,

vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/3rdparty/customer/customer_feature_type.h：

    // ThirdParty (bit 32-63)
    TP_FEATURE_HDR          = 1ULL << 32,
    TP_FEATURE_MFNR         = 1ULL << 33,
    TP_FEATURE_EIS          = 1ULL << 34,
    TP_FEATURE_FB           = 1ULL << 35,
    TP_FEATURE_FILTER       = 1ULL << 36,
    TP_FEATURE_DEPTH        = 1ULL << 37,
    TP_FEATURE_BOKEH        = 1ULL << 38,
    TP_FEATURE_VSDOF        = (TP_FEATURE_DEPTH|TP_FEATURE_BOKEH),
    TP_FEATURE_FUSION       = 1ULL << 39,
    TP_FEATURE_HDR_DC       = 1ULL << 40,   // used by DualCam
    TP_FEATURE_DUAL_YUV     = 1ULL << 41,
    TP_FEATURE_DUAL_HWDEPTH = 1ULL << 42,
    TP_FEATURE_PUREBOKEH    = 1ULL << 43,
    TP_FEATURE_RAW_HDR      = 1ULL << 44,
    TP_FEATURE_RELIGHTING   = 1ULL << 45,

MTK提供的这些feature可以满足绝大多数算法的集成，在可以对号入座的情况下，我们直接使用已有feature即可。如果不能够满足我们的要求，可以参考下节内容添加新的feature。

2.2 添加自定义feature

本来单帧算法对应的feature可以选择MTK提供的MTK_FEATURE_FB和TP_FEATURE_FB，但是为了讲解如何添加新feature，我们选择添加一个自定义feature：TP_FEATURE_WATERMARK。

vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/3rdparty/customer/customer_feature_type.h：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/3rdparty/customer/customer_feature_type.h b/vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/3rdparty/customer/customer_feature_type.h
old mode 100644
new mode 100755
index a41fd864f5..17bc35eea8
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/3rdparty/customer/customer_feature_type.h
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/3rdparty/customer/customer_feature_type.h
@@ -59,6 +59,7 @@ enum eFeatureIndexCustomer {
     TP_FEATURE_PUREBOKEH    = 1ULL << 43,
     TP_FEATURE_RAW_HDR      = 1ULL << 44,
     TP_FEATURE_RELIGHTING   = 1ULL << 45,
+    TP_FEATURE_WATERMARK    = 1ULL << 46,
     // TODO: reserve for customer feature index (bit 32-63)
 };

vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/CaptureFeature_Common.cpp：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/CaptureFeature_Common.cpp b/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/CaptureFeature_Common.cpp
old mode 100644
new mode 100755
index e32f80a609..47273b01c7
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/CaptureFeature_Common.cpp
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/CaptureFeature_Common.cpp
@@ -599,6 +599,7 @@ const char* FeatID2Name(FeatureID_T fid)
     case FID_FUSION_3RD_PARTY:      return "fusion_3rd_party";
     case FID_PUREBOKEH_3RD_PARTY:   return "purebokeh_3rd_party";
     case FID_RELIGHTING_3RD_PARTY:  return "relighting_3rd_party";
+    case FID_WATERMARK_3RD_PARTY:   return "watermark_3rd_party";
 
     default:                        return "unknown";
     };

vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/nodes/YUVNode.cpp：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/nodes/YUVNode.cpp b/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/nodes/YUVNode.cpp
index 8bb794ba02..d4343aaccf 100755
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/nodes/YUVNode.cpp
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/nodes/YUVNode.cpp
@@ -779,7 +779,8 @@ MBOOL YUVNode::onInit()
             featId = FID_FB_3RD_PARTY;
         else if (rProperty.mFeatures & TP_FEATURE_RELIGHTING)
             featId = FID_RELIGHTING_3RD_PARTY;
-
+        else if (rProperty.mFeatures & TP_FEATURE_WATERMARK)
+            featId = FID_WATERMARK_3RD_PARTY;
 
         if (featId != NULL_FEATURE) {
             MY_LOGD_IF(mLogLevel, "%s finds plugin:%s, priority:%d",

vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/feature/featurePipe/ICaptureFeaturePipe.h：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/feature/featurePipe/ICaptureFeaturePipe.h b/vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/feature/featurePipe/ICaptureFeaturePipe.h
old mode 100644
new mode 100755
index 2f1ad8a665..ab47aae456
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/feature/featurePipe/ICaptureFeaturePipe.h
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/feature/featurePipe/ICaptureFeaturePipe.h
@@ -172,6 +172,7 @@ enum CaptureFeatureFeatureID {
     FID_FUSION_3RD_PARTY,
     FID_PUREBOKEH_3RD_PARTY,
     FID_RELIGHTING_3RD_PARTY,
+    FID_WATERMARK_3RD_PARTY,
     NUM_OF_FEATURE,
     NULL_FEATURE = 0xFF,
 };

vendor/mediatek/proprietary/hardware/mtkcam3/pipeline/hwnode/p2/P2_CaptureProcessor.cpp：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/pipeline/hwnode/p2/P2_CaptureProcessor.cpp b/vendor/mediatek/proprietary/hardware/mtkcam3/pipeline/hwnode/p2/P2_CaptureProcessor.cpp
old mode 100644
new mode 100755
index cc1dc549fd..00559cbc30
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/pipeline/hwnode/p2/P2_CaptureProcessor.cpp
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/pipeline/hwnode/p2/P2_CaptureProcessor.cpp
@@ -428,6 +428,9 @@ MBOOL CaptureProcessor::onEnque(const sp<P2FrameRequest> &pP2Frame)
                 pCapRequest->addFeature(FID_HFG);
             if (feature & MTK_FEATURE_DCE)
                 pCapRequest->addFeature(FID_DCE);
+            if (feature & TP_FEATURE_WATERMARK)
+                pCapRequest->addFeature(FID_WATERMARK_3RD_PARTY);
+
         }
     }

3. 将算法对应的feature添加到scenario配置表

在我们打开camera进行预览和拍照的时候，MTK HAL3会执行vendor/mediatek/proprietary/hardware/mtkcam3/pipeline/policy/FeatureSettingPolicy.cpp的代码，会分别调用
vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/scenario_mgr.cpp的
get_streaming_scenario函数和get_capture_scenario函数。它们会读取一个scenario的feature配置表，遍历所有的feature，决定哪些feature会被执行。这个配置表中有许多的scenario，一个scenario可能对应多个feature。因此添加自定义feature后，还需将自定义的feature添加到配置表中。MTK feature 对应的配置表是 gMtkScenarioFeaturesMaps，customer feature 对应的配置表是 gCustomerScenarioFeaturesMaps。

vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/customer_scenario_mgr.cpp：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/customer_scenario_mgr.cpp b/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/customer_scenario_mgr.cpp
old mode 100644
new mode 100755
index f8d081e433..577f85797e
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/customer_scenario_mgr.cpp
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/customer_scenario_mgr.cpp
@@ -93,30 +93,30 @@ using namespace NSCam::v3::pipeline::policy::scenariomgr;
 // #define  <feature combination>              (key feature         | post-processing features | ...)
 //
 // single cam capture feature combination
-#define TP_FEATURE_COMBINATION_SINGLE          (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB)
-#define TP_FEATURE_COMBINATION_HDR             (TP_FEATURE_HDR      | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB)
-#define TP_FEATURE_COMBINATION_AINR            (MTK_FEATURE_AINR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB)
-#define TP_FEATURE_COMBINATION_MFNR            (MTK_FEATURE_MFNR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB)
-#define TP_FEATURE_COMBINATION_REMOSAIC        (MTK_FEATURE_REMOSAIC| MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB)
+#define TP_FEATURE_COMBINATION_SINGLE          (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_HDR             (TP_FEATURE_HDR      | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_AINR            (MTK_FEATURE_AINR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_MFNR            (MTK_FEATURE_MFNR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_REMOSAIC        (MTK_FEATURE_REMOSAIC| MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_WATERMARK)
 #define TP_FEATURE_COMBINATION_CSHOT           (NO_FEATURE_NORMAL   | MTK_FEATURE_CZ| MTK_FEATURE_HFG)
-#define TP_FEATURE_COMBINATION_YUV_REPROCESS   (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| TP_FEATURE_FB)
-#define TP_FEATURE_COMBINATION_RAW_REPROCESS   (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| TP_FEATURE_FB)
+#define TP_FEATURE_COMBINATION_YUV_REPROCESS   (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| TP_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_RAW_REPROCESS   (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| TP_FEATURE_FB| TP_FEATURE_WATERMARK)
 #define TP_FEATURE_COMBINATION_PRO             (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE)
-#define TP_FEATURE_COMBINATION_SUPER_NIGHT_RAW_REPROCESS (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| TP_FEATURE_FB)
+#define TP_FEATURE_COMBINATION_SUPER_NIGHT_RAW_REPROCESS (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| TP_FEATURE_FB| TP_FEATURE_WATERMARK)
 
 // dual cam capture feature combination
 // the VSDOF means the combination of Bokeh feature and Depth feature
-#define TP_FEATURE_COMBINATION_TP_VSDOF           (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_VSDOF)
-#define TP_FEATURE_COMBINATION_TP_VSDOF_HDR       (TP_FEATURE_HDR_DC   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_VSDOF)
-#define TP_FEATURE_COMBINATION_TP_VSDOF_MFNR      (MTK_FEATURE_MFNR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_VSDOF)
-#define TP_FEATURE_COMBINATION_TP_FUSION          (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_FUSION)
-#define TP_FEATURE_COMBINATION_TP_PUREBOKEH       (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_PUREBOKEH)
+#define TP_FEATURE_COMBINATION_TP_VSDOF           (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_VSDOF| TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_TP_VSDOF_HDR       (TP_FEATURE_HDR_DC   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_VSDOF| TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_TP_VSDOF_MFNR      (MTK_FEATURE_MFNR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_VSDOF| TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_TP_FUSION          (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_FUSION| TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_TP_PUREBOKEH       (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE| TP_FEATURE_FB| TP_FEATURE_PUREBOKEH| TP_FEATURE_WATERMARK)
 
 // streaming feature combination (TODO: it should be refined by streaming scenario feature)
-#define TP_FEATURE_COMBINATION_VIDEO_NORMAL       (MTK_FEATURE_FB|TP_FEATURE_FB)
-#define TP_FEATURE_COMBINATION_VIDEO_DUAL_YUV     (MTK_FEATURE_FB|MTK_FEATURE_DUAL_YUV|TP_FEATURE_FB|TP_FEATURE_DUAL_YUV)
-#define TP_FEATURE_COMBINATION_VIDEO_DUAL_HWDEPTH (MTK_FEATURE_FB|MTK_FEATURE_DUAL_HWDEPTH|TP_FEATURE_FB|TP_FEATURE_DUAL_HWDEPTH)
-#define TP_FEATURE_COMBINATION_VIDEO_DUAL_HWVSDOF (MTK_FEATURE_FB|TP_FEATURE_FB)
+#define TP_FEATURE_COMBINATION_VIDEO_NORMAL       (MTK_FEATURE_FB|TP_FEATURE_FB|TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_VIDEO_DUAL_YUV     (MTK_FEATURE_FB|MTK_FEATURE_DUAL_YUV|TP_FEATURE_FB|TP_FEATURE_DUAL_YUV|TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_VIDEO_DUAL_HWDEPTH (MTK_FEATURE_FB|MTK_FEATURE_DUAL_HWDEPTH|TP_FEATURE_FB|TP_FEATURE_DUAL_HWDEPTH|TP_FEATURE_WATERMARK)
+#define TP_FEATURE_COMBINATION_VIDEO_DUAL_HWVSDOF (MTK_FEATURE_FB|TP_FEATURE_FB|TP_FEATURE_WATERMARK)
 // ======================================================================================================
 //
 /******************************************************************************

vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/mtk_scenario_mgr.cpp：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/mtk_scenario_mgr.cpp b/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/mtk_scenario_mgr.cpp
old mode 100644
new mode 100755
index 011f551354..f14ff8a6e2
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/mtk_scenario_mgr.cpp
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/mtk_scenario_mgr.cpp
@@ -89,29 +89,29 @@ using namespace NSCam::v3::pipeline::policy::scenariomgr;
 // #define  <feature combination>              (key feature         | post-processing features | ...)
 //
 // single cam capture feature combination
-#define MTK_FEATURE_COMBINATION_SINGLE         (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB)
-#define MTK_FEATURE_COMBINATION_HDR            (TP_FEATURE_HDR      | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB)
-#define MTK_FEATURE_COMBINATION_AINR           (MTK_FEATURE_AINR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB)
-#define MTK_FEATURE_COMBINATION_MFNR           (MTK_FEATURE_MFNR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB)
-#define MTK_FEATURE_COMBINATION_REMOSAIC       (MTK_FEATURE_REMOSAIC| MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB)
+#define MTK_FEATURE_COMBINATION_SINGLE         (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_HDR            (TP_FEATURE_HDR      | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_AINR           (MTK_FEATURE_AINR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_MFNR           (MTK_FEATURE_MFNR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_REMOSAIC       (MTK_FEATURE_REMOSAIC| MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_WATERMARK)
 #define MTK_FEATURE_COMBINATION_CSHOT          (NO_FEATURE_NORMAL   | MTK_FEATURE_CZ| MTK_FEATURE_HFG)
-#define MTK_FEATURE_COMBINATION_YUV_REPROCESS  (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_FB)
-#define MTK_FEATURE_COMBINATION_RAW_REPROCESS  (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_FB)
-#define MTK_FEATURE_COMBINATION_SUPER_NIGHT_RAW_REPROCESS  (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_FB)
+#define MTK_FEATURE_COMBINATION_YUV_REPROCESS  (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_RAW_REPROCESS  (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_FB| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_SUPER_NIGHT_RAW_REPROCESS  (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_FB| TP_FEATURE_WATERMARK)
 
 // dual cam capture feature combination
 // the VSDOF means the combination of Bokeh feature and Depth feature
-#define MTK_FEATURE_COMBINATION_TP_VSDOF          (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_VSDOF)
-#define MTK_FEATURE_COMBINATION_TP_VSDOF_HDR      (TP_FEATURE_HDR_DC   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_VSDOF)
-#define MTK_FEATURE_COMBINATION_TP_VSDOF_MFNR     (MTK_FEATURE_MFNR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_VSDOF)
-#define MTK_FEATURE_COMBINATION_TP_FUSION         (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_FUSION)
-#define MTK_FEATURE_COMBINATION_TP_PUREBOKEH      (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_PUREBOKEH)
+#define MTK_FEATURE_COMBINATION_TP_VSDOF          (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_VSDOF| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_TP_VSDOF_HDR      (TP_FEATURE_HDR_DC   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_VSDOF| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_TP_VSDOF_MFNR     (MTK_FEATURE_MFNR    | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_VSDOF| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_TP_FUSION         (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_FUSION| TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_TP_PUREBOKEH      (NO_FEATURE_NORMAL   | MTK_FEATURE_NR| MTK_FEATURE_ABF| MTK_FEATURE_CZ| MTK_FEATURE_DRE| MTK_FEATURE_HFG| MTK_FEATURE_DCE | MTK_FEATURE_FB| TP_FEATURE_PUREBOKEH| TP_FEATURE_WATERMARK)
 
 // streaming feature combination (TODO: it should be refined by streaming scenario feature)
-#define MTK_FEATURE_COMBINATION_VIDEO_NORMAL     (MTK_FEATURE_FB|TP_FEATURE_FB)
-#define MTK_FEATURE_COMBINATION_VIDEO_DUAL_YUV   (MTK_FEATURE_FB|MTK_FEATURE_DUAL_YUV|TP_FEATURE_FB|TP_FEATURE_DUAL_YUV)
-#define MTK_FEATURE_COMBINATION_VIDEO_DUAL_HWDEPTH (MTK_FEATURE_FB|MTK_FEATURE_DUAL_HWDEPTH|TP_FEATURE_FB|TP_FEATURE_DUAL_HWDEPTH)
-#define MTK_FEATURE_COMBINATION_VIDEO_DUAL_HWVSDOF (MTK_FEATURE_FB|TP_FEATURE_FB)
+#define MTK_FEATURE_COMBINATION_VIDEO_NORMAL     (MTK_FEATURE_FB|TP_FEATURE_FB|TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_VIDEO_DUAL_YUV   (MTK_FEATURE_FB|MTK_FEATURE_DUAL_YUV|TP_FEATURE_FB|TP_FEATURE_DUAL_YUV|TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_VIDEO_DUAL_HWDEPTH (MTK_FEATURE_FB|MTK_FEATURE_DUAL_HWDEPTH|TP_FEATURE_FB|TP_FEATURE_DUAL_HWDEPTH|TP_FEATURE_WATERMARK)
+#define MTK_FEATURE_COMBINATION_VIDEO_DUAL_HWVSDOF (MTK_FEATURE_FB|TP_FEATURE_FB|TP_FEATURE_WATERMARK)
 // ======================================================================================================
 //
 /******************************************************************************

注意：
MTK在Android Q（10.0）上优化了scenario配置表的客制化，Android Q及更高版本，scenario需要在：
vendor/mediatek/proprietary/custom/[platform]/hal/camera/camera_custom_feature_table.cpp中配置，[platform]是诸如mt6580，mt6763之类的。

将自定义feature添加到scenario配置表时，不可贪多，只要添加到合适的scenario就行，多了可能多个算法会有冲突。如果仅在简单场景，添加到MTK_FEATURE_COMBINATION_SINGLE和TP_FEATURE_COMBINATION_SINGLE就可以满足绝大多数需求。(2021-02-02更新)

4. 挂载算法

4.1 为算法选择plugin

MTK HAL3在vendor/mediatek/proprietary/hardware/mtkcam3/include/mtkcam3/3rdparty/plugin/PipelinePluginType.h 中将三方算法的挂载点大致分为以下几类：

BokehPlugin： Bokeh算法挂载点，双摄景深算法的虚化部分。
DepthPlugin： Depth算法挂载点，双摄景深算法的计算深度部分。
FusionPlugin： Depth和Bokeh放在1个算法中，即合并的双摄景深算法挂载点。
JoinPlugin： Streaming相关算法挂载点，预览算法都挂载在这里。
MultiFramePlugin：多帧算法挂载点，包括YUV与RAW，例如MFNR/HDR
RawPlugin： RAW算法挂载点，例如remosaic
YuvPlugin： Yuv单帧算法挂载点，例如美颜、广角镜头畸变校正等

对号入座，将要集成的算法选择相应的plugin。这里是单帧算法，所以预览我们选择JoinPlugin，拍照选择YuvPlugin。

4.2 编写算法集成文件

参照FBImpl.cpp和sample_streaming_fb.cpp中分别实现拍照和预览。目录结构如下：
vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/tp_watermark/
├── Android.mk
├── include
│ └── watermark.h
├── lib
│ ├── arm64-v8a
│ │ └── libwatermark.so
│ └── armeabi-v7a
│ └── libwatermark.so
├── res
│ └── watermark.rgba
├── WatermarkCapture.cpp
└── WatermarkPreview.cpp

文件说明：

Android.mk中配置算法库、头文件、集成的源代码CPP文件编译成库libmtkcam.plugin.tp_watermark，供libmtkcam_3rdparty.customer依赖调用。
集成的源代码CPP文件，WatermarkCapture.cpp用于拍照，WatermarkPreview.cpp用于预览。
libwatermark.so实现了添加水印的功能，libwatermark.so用来模拟需要接入的第三方算法库。watermark.h是头文件。
watermark.rgba是对应的水印文件。

4.2.1 添加全局宏控

为了能控制某个项目是否集成此算法，我们在device/mediateksample/k63v2_64_bsp/ProjectConfig.mk中添加一个宏，用于控制新接入算法的编译：

QXT_WATERMARK_SUPPORT = yes

当某个项目不需要新接入的算法时，将device/mediateksample/[platform]/ProjectConfig.mk的QXT_WA_SUPPORT的值设为 no 就可以了。

4.2.2 mtkcam3/3rdparty/customer/tp_watermark/Android.mk

ifeq ($(QXT_WATERMARK_SUPPORT),yes)
LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := libwatermark
LOCAL_SRC_FILES_32 := lib/armeabi-v7a/libwatermark.so
LOCAL_SRC_FILES_64 := lib/arm64-v8a/libwatermark.so
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE_CLASS := SHARED_LIBRARIES
LOCAL_MODULE_SUFFIX := .so
LOCAL_PROPRIETARY_MODULE := true
LOCAL_MULTILIB := both
include $(BUILD_PREBUILT)
################################################################################

include $(CLEAR_VARS)

#-----------------------------------------------------------
include $(TOP)/$(MTK_PATH_SOURCE)/hardware/mtkcam/mtkcam.mk

#-----------------------------------------------------------
LOCAL_SRC_FILES += WatermarkCapture.cpp
LOCAL_SRC_FILES += WatermarkPreview.cpp

#-----------------------------------------------------------
LOCAL_C_INCLUDES += $(MTKCAM_C_INCLUDES)
LOCAL_C_INCLUDES += $(TOP)/$(MTK_PATH_SOURCE)/hardware/mtkcam3/include
LOCAL_C_INCLUDES += $(TOP)/$(MTK_PATH_SOURCE)/hardware/mtkcam/include
#
LOCAL_C_INCLUDES += system/media/camera/include
LOCAL_C_INCLUDES += $(TOP)/external/libyuv/files/include/
LOCAL_C_INCLUDES += $(TOP)/$(MTK_PATH_SOURCE)/hardware/mtkcam3/3rdparty/customer/tp_watermark/include

#-----------------------------------------------------------
LOCAL_CFLAGS += $(MTKCAM_CFLAGS)
#

#-----------------------------------------------------------
LOCAL_STATIC_LIBRARIES +=
#
LOCAL_WHOLE_STATIC_LIBRARIES +=

#-----------------------------------------------------------
LOCAL_SHARED_LIBRARIES += liblog
LOCAL_SHARED_LIBRARIES += libutils
LOCAL_SHARED_LIBRARIES += libcutils
LOCAL_SHARED_LIBRARIES += libmtkcam_modulehelper
LOCAL_SHARED_LIBRARIES += libmtkcam_stdutils
LOCAL_SHARED_LIBRARIES += libmtkcam_pipeline
LOCAL_SHARED_LIBRARIES += libmtkcam_metadata
LOCAL_SHARED_LIBRARIES += libmtkcam_metastore
LOCAL_SHARED_LIBRARIES += libmtkcam_streamutils
LOCAL_SHARED_LIBRARIES += libmtkcam_imgbuf
LOCAL_SHARED_LIBRARIES += libyuv.vendor
#-----------------------------------------------------------
LOCAL_HEADER_LIBRARIES := libutils_headers liblog_headers libhardware_headers

#-----------------------------------------------------------
LOCAL_MODULE := libmtkcam.plugin.tp_watermark
LOCAL_PROPRIETARY_MODULE := true
LOCAL_MODULE_OWNER := mtk
LOCAL_MODULE_TAGS := optional
include $(MTK_STATIC_LIBRARY)
################################################################################

include $(call all-makefiles-under,$(LOCAL_PATH))
endif

4.2.3 mtkcam3/3rdparty/customer/tp_watermark/WatermarkCapture.cpp

主要函数介绍：

在property函数中feature类型设置我们在第三步中添加的TP_FEATURE_WATERMARK，并设置名称、优先级等等属性。
在negotiate函数中配置算法需要的输入、输出图像的格式、尺寸。
在negotiate函数或者process函数中获取上层传下来的metadata参数，根据参数决定算法是否运行，或者将参数传给算法。
在process函数中接入算法。

注意：

MTK原文：
negotiate函数设置格式时，一个挂载点如果挂载多个同类型的plugin，则只有第一个 plugin 中的 negotiate 中的 input buffer 设定有效。
在YUVNode 下挂载单帧 YUV plugin时，一定要确保 MTK 平台的SWNR plugin 的 negotiate 直接返回不OK，不做任何 accepted format 等的设定。否则，可能会出现因 SWNR plugin和三方plugin negotiate时设定的 accepted format 不一致而导致的三方 plugin 拿不到它想要的 format 的buffer。

vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/swnr/SWNRImpl.cpp：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/swnr/SWNRImpl.cpp b/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/swnr/SWNRImpl.cpp
old mode 100644
new mode 100755
index 0ae951cc83..c4819068f7
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/swnr/SWNRImpl.cpp
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/mtk/swnr/SWNRImpl.cpp
@@ -340,7 +340,7 @@ negotiate(Selection& sel)
     sel.mOMetadataApp.setRequired(false);
     sel.mOMetadataHal.setRequired(true);
 
-    return OK;
+    return -EINVAL;//OK;
 }

vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/tp_watermark/WatermarkCapture.cpp：

#define LOG_TAG "WatermarkCapture"
//
#include <mtkcam/utils/std/Log.h>
//
#include <stdlib.h>
#include <utils/Errors.h>
#include <utils/List.h>
#include <utils/RefBase.h>
#include <sstream>
//
#include <mtkcam/utils/metadata/client/mtk_metadata_tag.h>
#include <mtkcam/utils/metadata/hal/mtk_platform_metadata_tag.h>
//
//
#include <mtkcam/utils/imgbuf/IIonImageBufferHeap.h>
//
#include <mtkcam/drv/IHalSensor.h>
#include <mtkcam/utils/std/Format.h>
//
#include <mtkcam3/pipeline/hwnode/NodeId.h>

#include <mtkcam/utils/metastore/ITemplateRequest.h>
#include <mtkcam/utils/metastore/IMetadataProvider.h>
#include <mtkcam3/3rdparty/plugin/PipelinePlugin.h>
#include <mtkcam3/3rdparty/plugin/PipelinePluginType.h>

#include <stdlib.h>
#include <watermark.h>
#include <mtkcam/utils/std/Time.h>
#include <time.h>
#include <libyuv.h>
//
using namespace NSCam;
using namespace android;
using namespace std;
using namespace NSCam::NSPipelinePlugin;
/******************************************************************************
 *
 ******************************************************************************/
#define MY_LOGV(fmt, arg...)        CAM_LOGV("(%d)[%s] " fmt, ::gettid(), __FUNCTION__, ##arg)
#define MY_LOGD(fmt, arg...)        CAM_LOGD("(%d)[%s] " fmt, ::gettid(), __FUNCTION__, ##arg)
#define MY_LOGI(fmt, arg...)        CAM_LOGI("(%d)[%s] " fmt, ::gettid(), __FUNCTION__, ##arg)
#define MY_LOGW(fmt, arg...)        CAM_LOGW("(%d)[%s] " fmt, ::gettid(), __FUNCTION__, ##arg)
#define MY_LOGE(fmt, arg...)        CAM_LOGE("(%d)[%s] " fmt, ::gettid(), __FUNCTION__, ##arg)
//
#define FUNCTION_IN                 MY_LOGD("%s +", __FUNCTION__)
#define FUNCTION_OUT                MY_LOGD("%s -", __FUNCTION__)
//systrace
#if 1
#ifndef ATRACE_TAG
#define ATRACE_TAG                           ATRACE_TAG_CAMERA
#endif
#include <utils/Trace.h>

#define WATERMARK_TRACE_CALL()                      ATRACE_CALL()
#define WATERMARK_TRACE_NAME(name)                  ATRACE_NAME(name)
#define WATERMARK_TRACE_BEGIN(name)                 ATRACE_BEGIN(name)
#define WATERMARK_TRACE_END()                       ATRACE_END()
#else
#define WATERMARK_TRACE_CALL()
#define WATERMARK_TRACE_NAME(name)
#define WATERMARK_TRACE_BEGIN(name)
#define WATERMARK_TRACE_END()
#endif

template <class T>
inline bool
tryGetMetadata(IMetadata const *pMetadata, MUINT32 tag, T& rVal)
{
    if(pMetadata == nullptr) return MFALSE;

    IMetadata::IEntry entry = pMetadata->entryFor(tag);
    if(!entry.isEmpty())
    {
        rVal = entry.itemAt(0,Type2Type<T>());
        return true;
    }
    else
    {
#define var(v) #v
#define type(t) #t
        MY_LOGW("no metadata %s in %s", var(tag), type(pMetadata));
#undef type
#undef var
    }
    return false;
}

/******************************************************************************
*
******************************************************************************/
class WatermarkCapture : public YuvPlugin::IProvider {

public:
    typedef YuvPlugin::Property Property;
    typedef YuvPlugin::Selection Selection;
    typedef YuvPlugin::Request::Ptr RequestPtr;
    typedef YuvPlugin::RequestCallback::Ptr RequestCallbackPtr;

private:
    int mOpenid;

    MBOOL mEnable = 1;
    MBOOL mDump = 0;
    unsigned char *mSrcRGBA = nullptr;
    unsigned char *mWatermarkRGBA = nullptr;
    int mWatermarkWidth = 0;
    int mWatermarkHeight = 0;

public:
    WatermarkCapture();

    ~WatermarkCapture();

    void init();

    void uninit();

    void abort(vector <RequestPtr> &pRequests);

    void set(MINT32 iOpenId, MINT32 iOpenId2);

    const Property &property();

    MERROR negotiate(Selection &sel);

    MERROR process(RequestPtr pRequest, RequestCallbackPtr pCallback);

};

WatermarkCapture::WatermarkCapture() : mOpenid(-1) {
    FUNCTION_IN;
    mEnable = property_get_bool("vendor.debug.camera.watermark.capture.enable", 1);
    mDump = property_get_bool("vendor.debug.camera.watermark.capture.dump", 0);
    FUNCTION_OUT;
}

WatermarkCapture::~WatermarkCapture() {
    FUNCTION_IN;
    FUNCTION_OUT;
}

void WatermarkCapture::init() {
    FUNCTION_IN;
    mWatermarkWidth = 180;
    mWatermarkHeight = 640;
    int watermarkSize = mWatermarkWidth * mWatermarkHeight * 4;
    mWatermarkRGBA = (unsigned char *) malloc(watermarkSize);

    FILE *fp;
    char path[256];
    snprintf(path, sizeof(path), "/vendor/res/images/watermark.rgba");
    if ((fp = fopen(path, "r")) == NULL) {
        MY_LOGE("Failed to open /vendor/res/images/watermark.rgba");
    }
    fread(mWatermarkRGBA, 1, watermarkSize, fp);
    fclose(fp);
    FUNCTION_OUT;
}

void WatermarkCapture::uninit() {
    FUNCTION_IN;
    free(mWatermarkRGBA);
    FUNCTION_OUT;
}

void WatermarkCapture::abort(vector <RequestPtr> &pRequests) {
    FUNCTION_IN;
    (void)pRequests;
    FUNCTION_OUT;
}

void WatermarkCapture::set(MINT32 iOpenId, MINT32 iOpenId2) {
    FUNCTION_IN;
    MY_LOGD("set openId:%d openId2:%d", iOpenId, iOpenId2);
    mOpenid = iOpenId;
    FUNCTION_OUT;
}

const WatermarkCapture::Property &WatermarkCapture::property() {
    FUNCTION_IN;
    static Property prop;
    static bool inited;

    if (!inited) {
        prop.mName = "TP_WATERMARK";
        prop.mFeatures = TP_FEATURE_WATERMARK;
        prop.mInPlace = MTRUE;
        prop.mFaceData = eFD_Current;
        prop.mPosition = 0;
        inited = true;
    }
    FUNCTION_OUT;
    return prop;
}

MERROR WatermarkCapture::negotiate(Selection &sel) {
    FUNCTION_IN;
    if (!mEnable) {
        MY_LOGD("Force off TP_WATERMARK");
        FUNCTION_OUT;
        return -EINVAL;
    }

    sel.mIBufferFull
            .setRequired(MTRUE)
            .addAcceptedFormat(eImgFmt_I420)
            .addAcceptedSize(eImgSize_Full);

    sel.mIMetadataDynamic.setRequired(MTRUE);
    sel.mIMetadataApp.setRequired(MTRUE);
    sel.mIMetadataHal.setRequired(MTRUE);
    sel.mOMetadataApp.setRequired(MTRUE);
    sel.mOMetadataHal.setRequired(MTRUE);

    FUNCTION_OUT;
    return OK;
}

MERROR WatermarkCapture::process(RequestPtr pRequest,
                               RequestCallbackPtr pCallback = nullptr) {
    FUNCTION_IN;
    WATERMARK_TRACE_CALL();

    MBOOL needRun = MFALSE;
    if (pRequest->mIBufferFull != nullptr && pRequest->mOBufferFull != nullptr) {
        IImageBuffer *pIBufferFull = pRequest->mIBufferFull->acquire();
        IImageBuffer *pOBufferFull = pRequest->mOBufferFull->acquire();

        if (pRequest->mIMetadataDynamic != nullptr) {
            IMetadata *meta = pRequest->mIMetadataDynamic->acquire();
            if (meta != NULL)
                MY_LOGD("[IN] Dynamic metadata count: %d", meta->count());
            else
                MY_LOGD("[IN] Dynamic metadata empty");
        }

        int frameNo = 0, requestNo = 0;
        if (pRequest->mIMetadataHal != nullptr) {
            IMetadata *pIMetataHAL = pRequest->mIMetadataHal->acquire();
            if (pIMetataHAL != NULL) {
                MY_LOGD("[IN] HAL metadata count: %d", pIMetataHAL->count());
                if (!tryGetMetadata<int>(pIMetataHAL, MTK_PIPELINE_FRAME_NUMBER, frameNo)) {
                    frameNo = 0;
                }
                if (!tryGetMetadata<int>(pIMetataHAL, MTK_PIPELINE_REQUEST_NUMBER, requestNo)) {
                    requestNo = 0;
                }
                MY_LOGD("frameNo: %d, requestNo: %d", frameNo, requestNo);
            } else {
                MY_LOGD("[IN] HAL metadata empty");
            }
        }

        if (pRequest->mIMetadataApp != nullptr) {
            IMetadata *pIMetadataApp = pRequest->mIMetadataApp->acquire();
            MINT32 mode = 0;
            if (!tryGetMetadata<MINT32>(pIMetadataApp, QXT_FEATURE_WATERMARK, mode)) {
                mode = 0;
            }
            needRun = mode == 1 ? 1 : 0;
        }
        MY_LOGD("needRun: %d", needRun);

        int width = pIBufferFull->getImgSize().w;
        int height = pIBufferFull->getImgSize().h;
        MINT inFormat = pIBufferFull->getImgFormat();

        if (needRun && inFormat == NSCam::eImgFmt_I420) {
            uint32_t currentTime = (NSCam::Utils::TimeTool::getReadableTime()) % 1000;
            time_t timep;
            time (&timep);
            char currentDate[20];
            strftime(currentDate, sizeof(currentDate), "%Y%m%d_%H%M%S", localtime(&timep));

            //dump input I420
            if (mDump) {
                char path[256];
                snprintf(path, sizeof(path), "/data/vendor/camera_dump/capture_in_frame%d_%dx%d_%s_%d.i420",
                    frameNo, width, height, currentDate, currentTime);
                pIBufferFull->saveToFile(path);
            }

            nsecs_t t1 = systemTime(CLOCK_MONOTONIC);
            if (mSrcRGBA == NULL) {
                mSrcRGBA = (unsigned char *) malloc(width * height * 4);
            }
            //convert I420 to RGBA
            libyuv::I420ToABGR((unsigned char *) (pIBufferFull->getBufVA(0)), width,
                               (unsigned char *) (pIBufferFull->getBufVA(1)), width >> 1,
                               (unsigned char *) (pIBufferFull->getBufVA(2)), width >> 1,
                               mSrcRGBA, width * 4,
                               width, height);
            nsecs_t t2 = systemTime(CLOCK_MONOTONIC);
            MY_LOGD("Prepare src cost %02ld ms", ns2ms(t2 - t1));

            Watermark::add(mSrcRGBA, width, height, mWatermarkRGBA, mWatermarkWidth, mWatermarkHeight, (width - mWatermarkWidth) / 2, (height - mWatermarkHeight) / 2);
            nsecs_t t3 = systemTime(CLOCK_MONOTONIC);
            MY_LOGD("Add watermark cost %02ld ms", ns2ms(t3 - t2));

            //convert RGBA to I420
            libyuv::ABGRToI420(mSrcRGBA, width * 4,
                               (unsigned char *) (pOBufferFull->getBufVA(0)), width,
                               (unsigned char *) (pOBufferFull->getBufVA(1)), width >> 1,
                               (unsigned char *) (pOBufferFull->getBufVA(2)), width >> 1,
                               width, height);
            nsecs_t t4 = systemTime(CLOCK_MONOTONIC);
            MY_LOGD("Copy in to out cost %02ld ms", ns2ms(t4 - t3));

            //dump output I420
            if (mDump) {
                char path[256];
                snprintf(path, sizeof(path), "/data/vendor/camera_dump/capture_out_frame%d_%dx%d_%s_%d.i420",
                    frameNo, width, height, currentDate, currentTime);
                pOBufferFull->saveToFile(path);
            }
            free(mSrcRGBA);
        } else {
            if (!needRun) {
                MY_LOGE("No need run, skip add watermark for capture.");
            } else if (inFormat != NSCam::eImgFmt_YV12) {
                MY_LOGE("Unsupported format, skip add watermark for capture.");
            } else {
                MY_LOGE("Unknown exception, skip add watermark for capture.");
            }

            memcpy((unsigned char *) (pOBufferFull->getBufVA(0)),
                   (unsigned char *) (pIBufferFull->getBufVA(0)),
                   pIBufferFull->getBufSizeInBytes(0));
            memcpy((unsigned char *) (pOBufferFull->getBufVA(1)),
                   (unsigned char *) (pIBufferFull->getBufVA(1)),
                   pIBufferFull->getBufSizeInBytes(1));
            memcpy((unsigned char *) (pOBufferFull->getBufVA(2)),
                   (unsigned char *) (pIBufferFull->getBufVA(2)),
                   pIBufferFull->getBufSizeInBytes(2));
        }

        pRequest->mIBufferFull->release();
        pRequest->mOBufferFull->release();

        if (pRequest->mIMetadataDynamic != nullptr) {
            pRequest->mIMetadataDynamic->release();
        }

        if (pRequest->mIMetadataHal != nullptr) {
            pRequest->mIMetadataHal->release();
        }

        if (pRequest->mIMetadataApp != nullptr) {
            pRequest->mIMetadataApp->release();
        }
    }

    if (pCallback != nullptr) {
        MY_LOGD("callback request");
        pCallback->onCompleted(pRequest, 0);
    }
    FUNCTION_OUT;
    return OK;
}

REGISTER_PLUGIN_PROVIDER(Yuv, WatermarkCapture);

4.2.4 mtkcam3/3rdparty/customer/tp_watermark/WatermarkPreview.cpp

#include <mtkcam3/3rdparty/plugin/PipelinePluginType.h>
#include <mtkcam/utils/metadata/hal/mtk_platform_metadata_tag.h>
#include <mtkcam/utils/metadata/client/mtk_metadata_tag.h>

#include <cutils/properties.h>

#include <watermark.h>
#include <mtkcam/utils/std/Time.h>
#include <time.h>
#include <libyuv.h>
#include <dlfcn.h>

using NSCam::NSPipelinePlugin::Interceptor;
using NSCam::NSPipelinePlugin::PipelinePlugin;
using NSCam::NSPipelinePlugin::PluginRegister;
using NSCam::NSPipelinePlugin::Join;
using NSCam::NSPipelinePlugin::JoinPlugin;

using namespace NSCam::NSPipelinePlugin;
using NSCam::MSize;

using NSCam::MERROR;
using NSCam::IImageBuffer;
using NSCam::IMetadata;
using NSCam::Type2Type;

#ifdef LOG_TAG
#undef LOG_TAG
#endif // LOG_TAG
#define LOG_TAG "WatermarkPreview"

#include <log/log.h>
#include <android/log.h>

#define MY_LOGI(fmt, arg...)  ALOGI("[%s] " fmt, __FUNCTION__, ##arg)
#define MY_LOGD(fmt, arg...)  ALOGD("[%s] " fmt, __FUNCTION__, ##arg)
#define MY_LOGW(fmt, arg...)  ALOGW("[%s] " fmt, __FUNCTION__, ##arg)
#define MY_LOGE(fmt, arg...)  ALOGE("[%s] " fmt, __FUNCTION__, ##arg)
#define FUNCTION_IN   MY_LOGD("%s +", __FUNCTION__)
#define FUNCTION_OUT  MY_LOGD("%s -", __FUNCTION__)

template <class T>
inline bool
tryGetMetadata(IMetadata const *pMetadata, MUINT32 tag, T& rVal)
{
    if(pMetadata == nullptr) return MFALSE;

    IMetadata::IEntry entry = pMetadata->entryFor(tag);
    if(!entry.isEmpty())
    {
        rVal = entry.itemAt(0,Type2Type<T>());
        return true;
    }
    else
    {
#define var(v) #v
#define type(t) #t
        MY_LOGW("no metadata %s in %s", var(tag), type(pMetadata));
#undef type
#undef var
    }
    return false;
}

class WatermarkPreview : public JoinPlugin::IProvider {
public:
    typedef JoinPlugin::Property Property;
    typedef JoinPlugin::Selection Selection;
    typedef JoinPlugin::Request::Ptr RequestPtr;
    typedef JoinPlugin::RequestCallback::Ptr RequestCallbackPtr;

private:
    bool mDisponly = false;
    bool mInplace = false;
    int mOpenID1 = 0;
    int mOpenID2 = 0;

    MBOOL mEnable = 1;
    MBOOL mDump = 0;
    unsigned char *mSrcRGBA = nullptr;
    unsigned char *mWatermarkRGBA = nullptr;
    int mWatermarkWidth = 0;
    int mWatermarkHeight = 0;

public:
    WatermarkPreview();

    ~WatermarkPreview();

    void init();

    void uninit();

    void abort(std::vector <RequestPtr> &pRequests);

    void set(MINT32 openID1, MINT32 openID2);

    const Property &property();

    MERROR negotiate(Selection &sel);

    MERROR process(RequestPtr pRequest, RequestCallbackPtr pCallback);

private:
    MERROR getConfigSetting(Selection &sel);

    MERROR getP1Setting(Selection &sel);

    MERROR getP2Setting(Selection &sel);
};

WatermarkPreview::WatermarkPreview() {
    FUNCTION_IN;
    mEnable = property_get_bool("vendor.debug.camera.watermark.preview.enable", 1);
    mDump = property_get_bool("vendor.debug.camera.watermark.preview.dump", 0);
    FUNCTION_OUT;
}

WatermarkPreview::~WatermarkPreview() {
    FUNCTION_IN;
    FUNCTION_OUT;
}

void WatermarkPreview::init() {
    FUNCTION_IN;
    mWatermarkWidth = 180;
    mWatermarkHeight = 640;
    int watermarkSize = mWatermarkWidth * mWatermarkHeight * 4;
    mWatermarkRGBA = (unsigned char *) malloc(watermarkSize);

    FILE *fp;
    char path[256];
    snprintf(path, sizeof(path), "/vendor/res/images/watermark.rgba");
    if ((fp = fopen(path, "r")) == NULL) {
        MY_LOGE("Failed to open /vendor/res/images/watermark.rgba");
    }
    fread(mWatermarkRGBA, 1, watermarkSize, fp);
    fclose(fp);
    FUNCTION_OUT;
}

void WatermarkPreview::uninit() {
    FUNCTION_IN;
    free(mSrcRGBA);
    free(mWatermarkRGBA);
    FUNCTION_OUT;
}

void WatermarkPreview::abort(std::vector <RequestPtr> &pRequests) {
    FUNCTION_IN;
    (void)pRequests;
    FUNCTION_OUT;
}

void WatermarkPreview::set(MINT32 openID1, MINT32 openID2) {
    FUNCTION_IN;
    MY_LOGD("set openID1:%d openID2:%d", openID1, openID2);
    mOpenID1 = openID1;
    mOpenID2 = openID2;
    FUNCTION_OUT;
}

const WatermarkPreview::Property &WatermarkPreview::property() {
    FUNCTION_IN;
    static Property prop;
    static bool inited;

    if (!inited) {
        prop.mName = "TP_WATERMARK";
        prop.mFeatures = TP_FEATURE_WATERMARK;
        //prop.mInPlace = MTRUE;
        //prop.mFaceData = eFD_Current;
        //prop.mPosition = 0;
        inited = true;
    }
    FUNCTION_OUT;
    return prop;
}

MERROR WatermarkPreview::negotiate(Selection &sel) {
    FUNCTION_IN;
    MERROR ret = OK;

    if (sel.mSelStage == eSelStage_CFG) {
        ret = getConfigSetting(sel);
    } else if (sel.mSelStage == eSelStage_P1) {
        ret = getP1Setting(sel);
    } else if (sel.mSelStage == eSelStage_P2) {
        ret = getP2Setting(sel);
    }
    FUNCTION_OUT;
    return ret;
}

MERROR WatermarkPreview::process(RequestPtr pRequest, RequestCallbackPtr pCallback) {
    FUNCTION_IN;
    (void) pCallback;
    MERROR ret = -EINVAL;
    MBOOL needRun = MFALSE;
    IImageBuffer *in = NULL, *out = NULL;

    if (pRequest->mIBufferMain1 != NULL && pRequest->mOBufferMain1 != NULL) {
        in = pRequest->mIBufferMain1->acquire();
        out = pRequest->mOBufferMain1->acquire();

        int frameNo = 0, requestNo = 0;
        if (pRequest->mIMetadataHal1 != nullptr) {
            IMetadata *pIMetataHAL1 = pRequest->mIMetadataHal1->acquire();
            if (pIMetataHAL1 != NULL) {
                if (!tryGetMetadata<int>(pIMetataHAL1, MTK_PIPELINE_FRAME_NUMBER, frameNo)) {
                    frameNo = 0;
                }
                if (!tryGetMetadata<int>(pIMetataHAL1, MTK_PIPELINE_REQUEST_NUMBER, requestNo)) {
                    requestNo = 0;
                }
                pRequest->mIMetadataHal1->release();
                MY_LOGD("frameNo: %d, requestNo: %d", frameNo, requestNo);
            } else {
                MY_LOGD("HAL metadata empty");
            }
        }

        MY_LOGD("in[%d](%dx%d)=%p out[%d](%dx%d)=%p",
                in->getPlaneCount(), in->getImgSize().w, in->getImgSize().h, in,
                out->getPlaneCount(), out->getImgSize().w, out->getImgSize().h, out);

        if (pRequest->mIMetadataApp != nullptr) {
            IMetadata *pIMetadataApp = pRequest->mIMetadataApp->acquire();
            MINT32 mode = 0;
            if (!tryGetMetadata<MINT32>(pIMetadataApp, QXT_FEATURE_WATERMARK, mode)) {
                mode = 0;
            }
            needRun = mode == 1 ? 1 : 0;
            pRequest->mIMetadataApp->release();
        }
        MY_LOGD("needRun: %d", needRun);

        int width = in->getImgSize().w;
        int height = in->getImgSize().h;
        MINT inFormat = in->getImgFormat();

        if (needRun && inFormat == NSCam::eImgFmt_YV12) {
            uint32_t currentTime = (NSCam::Utils::TimeTool::getReadableTime()) % 1000;
            time_t timep;
            time (&timep);
            char currentDate[20];
            strftime(currentDate, sizeof(currentDate), "%Y%m%d_%H%M%S", localtime(&timep));

            //dump input YV12
            if (mDump) {
                char path[256];
                snprintf(path, sizeof(path), "/data/vendor/camera_dump/preview_in_frame%d_%dx%d_%s_%d.yv12",
                    frameNo, width, height, currentDate, currentTime);
                in->saveToFile(path);
            }

            nsecs_t t1 = systemTime(CLOCK_MONOTONIC);
            if (mSrcRGBA == NULL) {
                mSrcRGBA = (unsigned char *) malloc(width * height * 4);
            }
            //convert YV12 to RGBA
            libyuv::I420ToABGR((unsigned char *)(in->getBufVA(0)), width,
                               (unsigned char *)(in->getBufVA(2)), width >> 1,
                               (unsigned char *)(in->getBufVA(1)), width >> 1,
                               mSrcRGBA, width * 4,
                               width, height);
            nsecs_t t2 = systemTime(CLOCK_MONOTONIC);
            MY_LOGD("Prepare src cost %02ld ms", ns2ms(t2 - t1));

            Watermark::add(mSrcRGBA, width, height, mWatermarkRGBA, mWatermarkWidth, mWatermarkHeight, (width - mWatermarkWidth) / 2, (height - mWatermarkHeight) / 2);
            nsecs_t t3 = systemTime(CLOCK_MONOTONIC);
            MY_LOGD("Add watermark cost %02ld ms", ns2ms(t3 - t2));

            //convert RGBA to YV12
            libyuv::ABGRToI420(mSrcRGBA, width * 4,
                               (unsigned char *)(out->getBufVA(0)), width,
                               (unsigned char *)(out->getBufVA(2)), width >> 1,
                               (unsigned char *)(out->getBufVA(1)), width >> 1,
                               width, height);
            nsecs_t t4 = systemTime(CLOCK_MONOTONIC);
            MY_LOGD("Copy in to out cost %02ld ms", ns2ms(t4 - t3));

            //dump output YV12
            if (mDump) {
                char path[256];
                snprintf(path, sizeof(path), "/data/vendor/camera_dump/preview_out_frame%d_%dx%d_%s_%d.yv12",
                    frameNo, width, height, currentDate, currentTime);
                out->saveToFile(path);
            }

        } else {
            if (!needRun) {
                MY_LOGE("No need run, skip add watermark for preview.");
            } else if (inFormat != NSCam::eImgFmt_YV12) {
                MY_LOGE("Unsupported format, skip add watermark for preview.");
            } else {
                MY_LOGE("Unknown exception, skip add watermark for preview.");
            }
            memcpy((unsigned char *) (out->getBufVA(0)),
                   (unsigned char *)(in->getBufVA(0)),
                   in->getBufSizeInBytes(0));
            memcpy((unsigned char *) (out->getBufVA(1)),
                   (unsigned char *)(in->getBufVA(1)),
                   in->getBufSizeInBytes(1));
            memcpy((unsigned char *) (out->getBufVA(2)),
                   (unsigned char *)(in->getBufVA(2)),
                   in->getBufSizeInBytes(2));
        }

        pRequest->mIBufferMain1->release();
        pRequest->mOBufferMain1->release();
        ret = OK;
    }

    FUNCTION_OUT;
    return ret;
}

MERROR WatermarkPreview::getConfigSetting(Selection &sel) {
    MY_LOGI("max out size(%dx%d)",
            sel.mCfgInfo.mMaxOutSize.w, sel.mCfgInfo.mMaxOutSize.h);

    mDisponly = property_get_bool("vendor.debug.tpi.s.fb.disponly", 0);
    mInplace = mDisponly || property_get_bool("vendor.debug.tpi.s.fb.inplace", 0);

    sel.mCfgOrder = 3;
    sel.mCfgJoinEntry = eJoinEntry_S_YUV;
    sel.mCfgInplace = mInplace;
    sel.mCfgEnableFD = MTRUE;
    sel.mCfgRun = mEnable;
    sel.mIBufferMain1.setRequired(MTRUE);
    if (!mDisponly && property_get_bool("vendor.debug.tpi.s.fb.nv21", 0)) {
        sel.mIBufferMain1.addAcceptedFormat(NSCam::eImgFmt_NV21);
    }
    if (!mDisponly && property_get_bool("vendor.debug.tpi.s.fb.size", 0)) {
        sel.mIBufferMain1.setSpecifiedSize(sel.mCfgInfo.mMaxOutSize);
    }
    sel.mOBufferMain1.setRequired(MTRUE);
    sel.mIBufferMain1.addAcceptedFormat(NSCam::eImgFmt_YV12);
    sel.mIBufferMain1.addAcceptedSize(eImgSize_Full);

    IMetadata *meta = sel.mIMetadataApp.getControl().get();
    MY_LOGD("sessionMeta=%p", meta);

    return OK;
}

MERROR WatermarkPreview::getP1Setting(Selection &sel) {
    (void) sel;
    return OK;
}

MERROR WatermarkPreview::getP2Setting(Selection &sel) {
    MBOOL run = MTRUE;
    sel.mP2Run = run;
    return OK;
}

REGISTER_PLUGIN_PROVIDER(Join, WatermarkPreview);

4.2.5 mtkcam3/3rdparty/customer/Android.mk

最终vendor.img需要的目标共享库是libmtkcam_3rdparty.customer.so。因此，我们还需要修改Android.mk，使模块libmtkcam_3rdparty.customer依赖libmtkcam.plugin.tp_watermark。vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/Android.mk：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/Android.mk b/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/Android.mk
old mode 100644
new mode 100755
index ce060c39f9..ff5763d3c2
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/Android.mk
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/Android.mk
@@ -70,6 +70,13 @@ LOCAL_WHOLE_STATIC_LIBRARIES += libmtkcam.plugin.tp_purebokeh
 LOCAL_SHARED_LIBRARIES += libcam.iopipe
 LOCAL_SHARED_LIBRARIES += libmtkcam_modulehelper
 endif
+
+ifeq ($(QXT_WATERMARK_SUPPORT), yes)
+LOCAL_SHARED_LIBRARIES += libwatermark
+LOCAL_SHARED_LIBRARIES += libyuv.vendor
+LOCAL_WHOLE_STATIC_LIBRARIES += libmtkcam.plugin.tp_watermark
+endif
+
 # for app super night ev decision (experimental for customer only)
 LOCAL_WHOLE_STATIC_LIBRARIES += libmtkcam.control.customersupernightevdecision

4.2.6 预置水印文件

diff --git a/device/mediateksample/k63v2_64_bsp/device.mk b/device/mediateksample/k63v2_64_bsp/device.mk
index 2619000c72..048c33462e 100644
--- a/device/mediateksample/k63v2_64_bsp/device.mk
+++ b/device/mediateksample/k63v2_64_bsp/device.mk
@@ -98,6 +98,9 @@ PRODUCT_COPY_FILES += vendor/mediatek/proprietary/custom/k63v2_64_bsp/factory/re
 PRODUCT_COPY_FILES += vendor/mediatek/proprietary/custom/k63v2_64_bsp/factory/res/images/lcd_test_01.png:$(TARGET_COPY_OUT_VENDOR)/res/images/lcd_test_01.png:mtk
 PRODUCT_COPY_FILES += vendor/mediatek/proprietary/custom/k63v2_64_bsp/factory/res/images/lcd_test_02.png:$(TARGET_COPY_OUT_VENDOR)/res/images/lcd_test_02.png:mtk
 
+ifeq ($(QXT_WATERMARK_SUPPORT),yes)
+PRODUCT_COPY_FILES += vendor/mediatek/proprietary/hardware/mtkcam3/3rdparty/customer/tp_watermark/res/watermark.rgba::$(TARGET_COPY_OUT_VENDOR)/res/images/watermark.rgba
+endif
 
 # overlay has priorities. high <-> low.

camera hal进程为mtk_camera_hal，它要读取/vendor/res/images/watermark.rgba，读取需要vendor_file SELinux权限。这里为mtk_camera_hal配置SELinux权限：

diff --git a/device/mediatek/sepolicy/bsp/non_plat/mtk_hal_camera.te b/device/mediatek/sepolicy/bsp/non_plat/mtk_hal_camera.te
index 8de5d0a437..7ebd9a03e5 100644
--- a/device/mediatek/sepolicy/bsp/non_plat/mtk_hal_camera.te
+++ b/device/mediatek/sepolicy/bsp/non_plat/mtk_hal_camera.te
@@ -92,6 +92,7 @@ allow mtk_hal_camera sysfs_boot_mode:file { read open };
 # Purpose: NDD
 allow mtk_hal_camera vendor_data_file:dir create_dir_perms;
 allow mtk_hal_camera vendor_data_file:file create_file_perms;
+allow mtk_hal_camera vendor_file:file { read getattr open };

5. 自定义metadata

添加metadata是为了让APP层能够通过metadata传递相应的参数给HAL层。APP层是通过CaptureRequest.Builder.set(@NonNull Key<T> key, T value)来设置参数的。
由于我们是自定义的feature，无法复用MTK提供的metadata，因此，我们需要自定义metadata。
vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag.h：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag.h b/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag.h
index 22d4aa2bf2..b020352092 100755
--- a/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag.h
+++ b/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag.h
@@ -89,6 +89,7 @@ typedef enum mtk_camera_metadata_section {
     MTK_BGSERVICE_FEATURE           = 12,
     MTK_CONFIGURE_SETTING           = 13,
     MTK_FLASH_FEATURE               = 14,
+    QXT_FEATURE                     = 15,
     MTK_VENDOR_SECTION_COUNT,
 } mtk_camera_metadata_section_t;
 
@@ -146,6 +147,7 @@ typedef enum mtk_camera_metadata_section_start {
     MTK_CONFIGURE_SETTING_START                 = (MTK_CONFIGURE_SETTING + MTK_VENDOR_TAG_SECTION) << 16,
     MTK_FLASH_FEATURE_START                     = (MTK_FLASH_FEATURE + MTK_VENDOR_TAG_SECTION) << 16,
 
+    QXT_FEATURE_START                           = (QXT_FEATURE + MTK_VENDOR_TAG_SECTION) << 16,
 } mtk_camera_metadata_section_start_t;
 
 
@@ -599,6 +601,8 @@ typedef enum mtk_camera_metadata_tag {
     MTK_FLASH_FEATURE_CALIBRATION_RESULT,    // flash calibration result
     MTK_FLASH_FEATURE_END,
 
+    QXT_FEATURE_WATERMARK = QXT_FEATURE_START,
+    QXT_FEATURE_END,
 } mtk_camera_metadata_tag_t;
 
 /**

vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag_info.inl：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag_info.inl b/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag_info.inl
index 15449c433d..1b4fc75a0e 100755
--- a/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag_info.inl
+++ b/vendor/mediatek/proprietary/hardware/mtkcam/include/mtkcam/utils/metadata/client/mtk_metadata_tag_info.inl
@@ -91,6 +91,11 @@ _IMP_SECTION_INFO_(MTK_DISTORTION_CORRECTION_INFO,  "mtk.distortionCorrection")
 _IMP_SECTION_INFO_(MTK_IOPIPE_INFO,                 "mtk.iopipe.info")
 _IMP_SECTION_INFO_(MTK_HAL_INFO,                    "mtk.hal.info")
 
+_IMP_SECTION_INFO_(QXT_FEATURE,      "com.qxt.camera")
+
+_IMP_TAG_INFO_( QXT_FEATURE_WATERMARK,
+                MINT32,     "watermark")
+
 /******************************************************************************
  *
  ******************************************************************************/

vendor/mediatek/proprietary/hardware/mtkcam/utils/metadata/vendortag/VendorTagTable.h：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam/utils/metadata/vendortag/VendorTagTable.h b/vendor/mediatek/proprietary/hardware/mtkcam/utils/metadata/vendortag/VendorTagTable.h
index 2481492f90..33e581adfd 100755
--- a/vendor/mediatek/proprietary/hardware/mtkcam/utils/metadata/vendortag/VendorTagTable.h
+++ b/vendor/mediatek/proprietary/hardware/mtkcam/utils/metadata/vendortag/VendorTagTable.h
@@ -377,6 +377,16 @@ static auto& _FlashFeature_()
 }
 
 
+static auto& _QxtFeature_()
+{
+    static const std::map<uint32_t, VendorTag_t>
+    sInst = {
+        _TAG_(QXT_FEATURE_WATERMARK,
+            "watermark",   TYPE_INT32),
+     };
+     //
+     return sInst;
+}
 
 /******************************************************************************
  *
@@ -460,6 +470,10 @@ static auto& getGlobalSections()
                     MTK_FLASH_FEATURE_END,
                     _FlashFeature_() ),
 
+        _SECTION_( "com.qxt.camera",
+                    QXT_FEATURE_START,
+                    QXT_FEATURE_END,
+                    _QxtFeature_() ),
     };
 
     // append custom vendor tags sections to mtk sections

vendor/mediatek/proprietary/hardware/mtkcam/utils/metastore/metadataprovider/constructStaticMetadata.cpp：

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam/utils/metastore/metadataprovider/constructStaticMetadata.cpp b/vendor/mediatek/proprietary/hardware/mtkcam/utils/metastore/metadataprovider/constructStaticMetadata.cpp
index edd5b5f1b9..591b25b162 100755
--- a/vendor/mediatek/proprietary/hardware/mtkcam/utils/metastore/metadataprovider/constructStaticMetadata.cpp
+++ b/vendor/mediatek/proprietary/hardware/mtkcam/utils/metastore/metadataprovider/constructStaticMetadata.cpp
@@ -578,6 +578,19 @@ updateData(IMetadata &rMetadata)
         }
     }
 #endif
+
+#if 1
+    {
+        IMetadata::IEntry qxtAvailRequestEntry = rMetadata.entryFor(MTK_REQUEST_AVAILABLE_REQUEST_KEYS);
+        qxtAvailRequestEntry.push_back(QXT_FEATURE_WATERMARK , Type2Type< MINT32 >());
+        rMetadata.update(qxtAvailRequestEntry.tag(), qxtAvailRequestEntry);
+
+        IMetadata::IEntry qxtAvailSessionEntry = rMetadata.entryFor(MTK_REQUEST_AVAILABLE_SESSION_KEYS);
+        qxtAvailSessionEntry.push_back(QXT_FEATURE_WATERMARK , Type2Type< MINT32 >());
+        rMetadata.update(qxtAvailSessionEntry.tag(), qxtAvailSessionEntry);
+    }
+#endif
+
     // update multi-cam feature mode to static metadata
     // vendor tag
     {

前面这些步骤完成之后，集成工作就基本完成了。我们需要重新编译一下系统源码，为节约时间，也可以只编译vendor.img。趁着编译的时间，我们可以写一个demo来验证算法是否集成成功了。

6. APP调用算法

WatermarkActivity：

public class WatermarkActivity extends BaseActivity {
    private static final String TAG = WatermarkActivity.class.getSimpleName();

    /*
     * 16:9 picture size: 3840x2160  preview size 1280x720
     * 4:3  picture size: 3264x2448  preview size 960x720
     * Now is 4:3
     */
    private static final int PREVIEW_WIDTH = 1280;
    private static final int PREVIEW_HEIGHT = 720;
    private static final int CAPTURE_WIDTH = 3264;
    private static final int CAPTURE_HEIGHT = 2448;

    private static final String IMAGE_PATH =
            Environment.getExternalStorageDirectory().getAbsolutePath()
            + File.separator + "DCIM" + File.separator + "Camera";

    private static final String CAMERA_ID = "0";
    private static final String KEY_WATERMARK = "com.qxt.camera.watermark";

    private static final String SP_NAME = "watermark";
    private static final String SP_STATE_KEY = "state";

    private AutoFitTextureView mTextureView;
    private ProgressBar mProgressBar;
    private Handler mMainHandler;
    private Handler mCameraHandler;
    private HandlerThread mCameraHandlerThread;

    private CameraManager mCameraManager;
    private CaptureRequest.Builder mPreviewBuilder;
    private CameraDevice mCameraDevice;
    private CameraCaptureSession mCameraCaptureSession;

    private MediaActionSound mCameraSound;
    private String mTakePictureTime;
    private SimpleDateFormat mDateFormat = new SimpleDateFormat(
            "yyyyMMdd_HHmmss", Locale.getDefault());

    private ImageReader mCaptureImageReader;
    private Surface mSurface;
    public CaptureRequest.Key<int[]> mVendorKey;
    private int mVendorKeyEnable;
    private SharedPreferences mSharedPref;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,
                WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.activity_watermark);
        mProgressBar = findViewById(R.id.progressbar);
        mTextureView = findViewById(R.id.texture);
        mTextureView.setAspectRatio(PREVIEW_HEIGHT, PREVIEW_WIDTH);

        mCameraSound = new MediaActionSound();
        mCameraSound.load(MediaActionSound.SHUTTER_CLICK);

        mCameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
        mMainHandler = new Handler();
        initVendorTag();
        mSharedPref = getSharedPreferences(SP_NAME, Context.MODE_PRIVATE);
        mVendorKeyEnable = mSharedPref.getInt(SP_STATE_KEY, 0);
        getCameraCharacteristics(CAMERA_ID);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_watermark, menu);

        Switch s = menu.findItem(R.id.action_watermark)
                .getActionView().findViewById(R.id.switch_watermark);
        s.setChecked(mVendorKeyEnable > 0);
        s.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton btn, boolean isChecked) {
                if (isChecked) {
                    mVendorKeyEnable = 1;
                } else {
                    mVendorKeyEnable = 0;
                }
                mSharedPref.edit().putInt(SP_STATE_KEY, mVendorKeyEnable).commit();
                if (mPreviewBuilder != null && mCameraCaptureSession != null) {
                    try {
                        mCameraCaptureSession.stopRepeating();
                        setVendorTag(mPreviewBuilder);
                        mCameraCaptureSession.setRepeatingRequest(mPreviewBuilder.build(),
                                mSessionCaptureCallback, mCameraHandler);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }
                LogUtils.d(TAG, "[onCheckedChanged] isChecked=" + isChecked
                        + ", mWideAngleEnable=" + mVendorKeyEnable);
            }
        });
        return true;
    }

    @Override
    protected void onResume() {
        super.onResume();
        initLooper();

        if (mTextureView.isAvailable()) {
            openCamera();
        } else {
            mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
        }

    }

    @Override
    protected void onPause() {
        super.onPause();
        closeCamera();
        stopLooper();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }

    public void onClick(View view) {
        if (view != null && view.getId() == R.id.btn_capture) {
            takePicture();
        }
    }

    private void initLooper() {
        mCameraHandlerThread = new HandlerThread("WideAngleCamera");
        mCameraHandlerThread.start();
        mCameraHandler = new Handler(mCameraHandlerThread.getLooper());
    }

    private void stopLooper() {
        try {
            mCameraHandlerThread.quit();
            mCameraHandlerThread.join();
            mCameraHandlerThread = null;
            mCameraHandler = null;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @SuppressLint("MissingPermission")
    private void openCamera() {
        try {
            mCameraManager.openCamera(CAMERA_ID, new CameraDevice.StateCallback() {
                @Override
                public void onOpened(@NonNull CameraDevice camera) {
                    mCameraDevice = camera;
                    createCameraPreviewSession();
                }

                @Override
                public void onDisconnected(@NonNull CameraDevice camera) {
                    LogUtils.d(TAG, "onDisconnected");
                    camera.close();
                    mCameraDevice = null;
                }

                @Override
                public void onError(@NonNull CameraDevice camera, int error) {
                    LogUtils.d(TAG, "onError error=" + error);
                    camera.close();
                    mCameraDevice = null;
                }
            }, mCameraHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void closeCamera() {
        try {
            if (null != mCameraCaptureSession) {
                mCameraCaptureSession.close();
                mCameraCaptureSession = null;
            }
            if (null != mCameraDevice) {
                mCameraDevice.close();
                mCameraDevice = null;
            }
            if (null != mCaptureImageReader) {
                mCaptureImageReader.close();
                mCaptureImageReader = null;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void createCameraPreviewSession() {
        if (isFinishing() || isDestroyed() || mCameraDevice == null) {
            return;
        }

        try {
            mCaptureImageReader = ImageReader.newInstance(CAPTURE_WIDTH,
                    CAPTURE_HEIGHT, ImageFormat.YUV_420_888, 2);
            mCaptureImageReader.setOnImageAvailableListener(
                    mCaptureOnImageAvailableListener, mCameraHandler);

            mPreviewBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            setVendorTag(mPreviewBuilder);
            mPreviewBuilder.addTarget(mSurface);
            mCameraDevice.createCaptureSession(Arrays.asList(mSurface,
                    mCaptureImageReader.getSurface()),
                    new CameraCaptureSession.StateCallback() {
                        @Override
                        public void onConfigured(@NonNull CameraCaptureSession session) {
                            if (isFinishing() || isDestroyed() || mCameraDevice == null) {
                                return;
                            }
                            try {
                                mCameraCaptureSession = session;
                                mPreviewBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                                        CaptureRequest.CONTROL_AF_MODE_AUTO);
                                mPreviewBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                                        CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
                                mCameraCaptureSession.setRepeatingRequest(mPreviewBuilder.build(),
                                        mSessionCaptureCallback, mCameraHandler);
                            } catch (CameraAccessException e) {
                                e.printStackTrace();
                            }
                        }

                        @Override
                        public void onConfigureFailed(@NonNull CameraCaptureSession session) {

                        }
                    }, mCameraHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void takePicture() {
        try {
            mTakePictureTime = mDateFormat.format(System.currentTimeMillis());
            final CaptureRequest.Builder captureBuilder =
                    mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
            setVendorTag(captureBuilder);
            Surface surface = mCaptureImageReader.getSurface();
            captureBuilder.addTarget(surface);
            mCameraCaptureSession.capture(captureBuilder.build(),
                    new CameraCaptureSession.CaptureCallback() {
                @Override
                public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                               @NonNull CaptureRequest request,
                                               @NonNull TotalCaptureResult result) {
                    super.onCaptureCompleted(session, request, result);
                }
            }, mCameraHandler);
            if (mCameraSound != null) {
                mCameraSound.play(MediaActionSound.SHUTTER_CLICK);
            }
            mProgressBar.setVisibility(View.VISIBLE);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void notifyPictureTaken() {
        mProgressBar.setVisibility(View.GONE);
        Toast toast = Toast.makeText(WatermarkActivity.this,
                getString(R.string.image_saved, IMAGE_PATH), Toast.LENGTH_SHORT);
        toast.setGravity(Gravity.CENTER, 0, 0);
        toast.show();
    }

    @SuppressWarnings("unused")
    private void getCameraCharacteristics(String cameraId) {
        try {
            CameraCharacteristics cs = mCameraManager.getCameraCharacteristics(cameraId);
            StreamConfigurationMap map = cs.get(
                    CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
            if (map != null) {
                //获取图像输出的尺寸
                Size[] pictureSize = map.getOutputSizes(ImageFormat.JPEG);
                Size[] previewSize = map.getOutputSizes(SurfaceTexture.class);
                StringBuilder pictureBuilder = new StringBuilder("picture sizes: ");
                for (Size size : pictureSize) {
                    pictureBuilder.append(size);
                    pictureBuilder.append(", ");
                }
                LogUtils.d(TAG, pictureBuilder.toString());

                StringBuilder previewBuilder = new StringBuilder("preview sizes: ");
                for (Size size : previewSize) {
                    previewBuilder.append(size);
                    previewBuilder.append(", ");
                }
                LogUtils.d(TAG, previewBuilder.toString());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    TextureView.SurfaceTextureListener mSurfaceTextureListener
            = new TextureView.SurfaceTextureListener() {
        @Override
        public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int w, int h) {
            LogUtils.d(TAG, "onSurfaceAvaliable, width:" + w + ", height:" + h);
            surfaceTexture.setDefaultBufferSize(PREVIEW_WIDTH, PREVIEW_HEIGHT);
            mSurface = new Surface(surfaceTexture);
            openCamera();
        }

        @Override
        public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int w, int h) {
            LogUtils.d(TAG, "onSurfaceTextureSizeChanged, width:" + w + ", height:" + h);
        }

        @Override
        public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
            LogUtils.d(TAG, "onSurfaceTextureDestroyed");
            mSurface = null;
            return false;
        }

        @Override
        public void onSurfaceTextureUpdated(SurfaceTexture surface) {

        }
    };

    private final CameraCaptureSession.CaptureCallback mSessionCaptureCallback
            = new CameraCaptureSession.CaptureCallback() {
        @Override
        public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                       @NonNull CaptureRequest request,
                                       @NonNull TotalCaptureResult result) {
            super.onCaptureCompleted(session, request, result);
            mCameraCaptureSession = session;
        }
    };

    private final ImageReader.OnImageAvailableListener mCaptureOnImageAvailableListener
            = new ImageReader.OnImageAvailableListener() {
        @Override
        public void onImageAvailable(final ImageReader reader) {
            LogUtils.d(TAG, "capture onImageAvailable");
            Image image = reader.acquireLatestImage();
            if (image == null) return;
            ImageUtils.saveImage(WatermarkActivity.this, image, IMAGE_PATH,
                    "WIDE_" + mTakePictureTime, ImageUtils.ROTATE_90);
            image.close();
            LogUtils.d(TAG, "saved");
            mMainHandler.post(new Runnable() {
                @Override
                public void run() {
                    notifyPictureTaken();
                }
            });
        }
    };

    private void initVendorTag() {
        try {
            CameraCharacteristics c = mCameraManager.getCameraCharacteristics(CAMERA_ID);
            mVendorKey = CameraUtils.getSessionKey(c, KEY_WATERMARK);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void setVendorTag(CaptureRequest.Builder builder) {
        if (mVendorKey != null) {
            builder.set(mVendorKey, new int[]{mVendorKeyEnable});
            LogUtils.d(TAG, "[setVendorTag] set watermark to " + mVendorKeyEnable);
        }
    }
}

CameraUtils：

public class CameraUtils {
    private static final String TAG = CameraUtils.class.getSimpleName();

    @RequiresApi(api = Build.VERSION_CODES.P)
    public static CaptureRequest.Key<int[]> getSessionKey(
            CameraCharacteristics cs, String key) {
        if (cs == null) {
            LogUtils.i(TAG, "[getSessionKey] CameraCharacteristics is null");
            return null;
        }
        CaptureRequest.Key<int[]> targetKey = null;
        List<CaptureRequest.Key<?>> sessionKeys = cs.getAvailableSessionKeys();
        if (sessionKeys == null) {
            LogUtils.i(TAG, "[getSessionKey] No keys!");
            return null;
        }
        for (CaptureRequest.Key<?> sessionKey : sessionKeys) {
            if (sessionKey.getName().equals(key)) {
                LogUtils.i(TAG, "[getSessionKey] key :" + key);
                targetKey = (CaptureRequest.Key<int[]>) sessionKey;
                break;
            }
        }
        return targetKey;
    }
}

为样机刷入系统整包或者vendor.img，开机后，安装demo验证。我们来拍一张电脑显示器看看效果：
预览：

预览调用水印算法.png

拍照：

拍照调用加水印算法.jpg

7. 遇到的问题及解决方法

问题1：
如果process函数中buffer的acquire和release没有成对出现，也就是buffer没正常release，那么就会出现连续拍多张之后，算法未被调用的情况。
问题1解决方法：
YUVNode.cpp中加入一个保险的代码，万一集成代码中忘记release，在YUVNode中release。

diff --git a/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/nodes/YUVNode.cpp b/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/nodes/YUVNode.cpp
index 8bb794ba02..d4343aaccf 100755
--- a/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/nodes/YUVNode.cpp
+++ b/vendor/mediatek/proprietary/hardware/mtkcam3/feature/core/featurePipe/capture/nodes/YUVNode.cpp
@@ -1050,9 +1051,11 @@ MBOOL YUVNode::onRequestProcess(RequestPtr& pRequest)
 
     auto pPlgRequest = mPlugin->createRequest();
 
-    pPlgRequest->mIBufferFull  = (iBufferFullHandle == NULL) ? PluginHelper::CreateBuffer(pNodeReq, TID_MAN_FULL_YUV, INPUT) : iBufferFullHandle;
+    //pPlgRequest->mIBufferFull  = (iBufferFullHandle == NULL) ? PluginHelper::CreateBuffer(pNodeReq, TID_MAN_FULL_YUV, INPUT) : iBufferFullHandle;
+    pPlgRequest->mIBufferFull  = (iBufferFullHandle == NULL) ? PluginHelper::CreateBuffer(pNodeReq, TID_MAN_FULL_YUV, INPUT) : std::move(iBufferFullHandle);
     pPlgRequest->mIBufferClean = PluginHelper::CreateBuffer(pNodeReq, TID_MAN_FULL_PURE_YUV, INPUT);
-    pPlgRequest->mOBufferFull  = (oBufferFullHandle == NULL) ? PluginHelper::CreateBuffer(pNodeReq, TID_MAN_FULL_YUV, OUTPUT) : oBufferFullHandle;
+    //pPlgRequest->mOBufferFull  = (oBufferFullHandle == NULL) ? PluginHelper::CreateBuffer(pNodeReq, TID_MAN_FULL_YUV, OUTPUT) : oBufferFullHandle;
+    pPlgRequest->mOBufferFull  = (oBufferFullHandle == NULL) ? PluginHelper::CreateBuffer(pNodeReq, TID_MAN_FULL_YUV, OUTPUT) : std::move(oBufferFullHandle);
 
     pPlgRequest->mIMetadataDynamic = PluginHelper::CreateMetadata(pNodeReq, MID_MAN_IN_P1_DYNAMIC);
     pPlgRequest->mIMetadataApp = PluginHelper::CreateMetadata(pNodeReq, MID_MAN_IN_APP);

问题2：
算法需要RGB数据，HAL层是YUV数据，使用openGL和各类RGB转换公式进行YUV和RGB互转后，最终照片有色差。
问题2解决方法：
使用libyuv进行转换，libyuv转换效率非常高，经测试，libyuv比公式法和opencv都要快，并且没有色差。android源码本身已集成libyuv，使用起来也非常方便。
Android.mk:

LOCAL_C_INCLUDES += $(TOP)/external/libyuv/files/include/
LOCAL_SHARED_LIBRARIES += libyuv.vendor

如不清楚libyuv的使用，请参考本人的另外一篇文章：YUV420转RGBA之使用libyuv

8. 结语

现公司是家ODM公司，2018年起公司开始做AI算法，我被招来做android平台上的算法集成工作。然而我虽有几年App和Frameworks的工作经验，之前却一直是以java作为主要开发语言，C/C++语言的开发工作甚至是大学时代的事情，而部门当中会android开发的也仅有我一人。在这种情形下，重新学C/C++，并摸索着开始集成算法，真的非常具有挑战性。

当时我们公司与某公司有合作，我们刚开始寄希望于该公司可以提供技术支援，以帮助我们完成算法集成的工作。然而，该公司不但有手机OS，也有自家的AI算法部门，在技术支援上对方不愿意配合。

在一段时间的学习和实践之后，我也终于基本掌握了算法集成的方法和步骤。很感激部门leader L老师能够给予我如此多的耐心和支持。回过头来看，算法集成并不复杂，甚至没有任何技术原理上的东西，只是一些繁琐的步骤。于是，在项目不忙的情况下，写下本文。希望以此记录自己的心路历程，也期待可以帮助到有需要的人。本文的主要内容最初于2019年就写好了，但是由于某些原因，时至今日才整理发出来，不管怎样，但愿好文不怕晚。

9. 本文参考

本文主要参考MTK-Online的Camera quick start部分，MTK在MTK-Online上有详细的文章及教程（为MTK点赞）：
https://online.mediatek.com/QuickStart/2a17666a-9d46-4686-9222-610ec0f087cc

欢迎交流、点赞、转载，码字不易，转载请注明出处。

最后编辑于：2021.04.27 11:50:18

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