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这一篇我们开始讲： Camera相机人脸识别系列专题分析之十九：MTK平台FDNode传递三方FFD到APP流程解析
目录
[2.2 ：OcamMeta::process更新FFD](#2.2 ：OcamMeta::process更新FFD)
[2.3 ：setFfdData2App](#2.3 ：setFfdData2App)
一、背景
我们知道app和hal属于两个不同进程，而进程间通信在camera领域一个重要的知识点就是camerameta，最典型的就是存放3A信息，我们也可以客制化存在FFD相关信息，来实现进程间通信。
二、：OcamMeta传递FFD到APP
2.1：OcamMeta
ocam_meta.cpp是对camera meta统一管理，之前的FFD数据就是在这里通过写入meta中，最后APP会读取meta来完成获取HAL的FFD数据。
而核心流程是CamThread::CamThreadHandle::threadLoop线程中，通过enqueNode最后调用到OcamMeta::process来完成meta的更新。
2.2 ：OcamMeta::process更新FFD
OcamMeta::process函数中，会更新很多camera相关meta，FFD相关meta最终是通过setFfdData2App来完成
cpp
MERROR OcamMeta::process(RequestPtr pRequest, RequestCallbackPtr pCallback)
{
if( pRequest != NULL )
{
IMetadata *pIMetadataDynamic1 = acquire(pRequest->mIMetadataDynamic1);
IMetadata *pOMetadataApp = acquire(pRequest->mOMetadataApp);
IMetadata *pOMetadataHal = acquire(pRequest->mOMetadataHal);
mDataMetaToAsync.mFaceNum = 0;
thirdFaceDataAppJoint facedata;
memset(&facedata, 0, sizeof(thirdFaceDataAppJoint));
if (pIMetadataHal1 != NULL) {
MINT64 p1timestamp = 0;
IMetadata::IEntry entryP1Timestamp = pRequest->mIMetadataHal1->acquire()->entryFor(MTK_P1NODE_FRAME_START_TIMESTAMP);
if (!entryP1Timestamp.isEmpty()) {
p1timestamp = entryP1Timestamp.itemAt(0, Type2Type<MINT64>());
} else {
MY_LOGE("Cant get p1 timestamp meta.");
}
auto fdReader = IFDContainer::createInstance(LOG_TAG, IFDContainer::eFDContainer_Opt_Read);
if (fdReader != NULL) {
MBOOL fdResult = MFALSE;
FD_DATATYPE fdData;
fdResult = fdReader->cloneLatestFD(fdData, mOpenID);
if (fdResult) {
mFDdata = std::make_shared<FD_DATATYPE>();
fdData.clone(*mFDdata);
mDataMetaToAsync.mFaceNum = mFDdata->facedata.number_of_faces;
MY_LOGD_IF(mLogDebug, "FDNode Result FaceNum(%d),openID(%d)", mFDdata->facedata.number_of_faces, mOpenID);
} else {
MY_LOGI("fdData is not found");
}
} else {
MY_LOGD_IF(mLogDebug, "Can not get FDContainer");
}
if (mDataMetaToAsync.mIsUseCusFd) {
if (thirdIFDContainer::hasInstance(thirdIFDContainer::third_eFDContainer_Opt_Read)) {
auto thirdFdReader = thirdIFDContainer::createInstance(LOG_TAG, thirdIFDContainer::third_eFDContainer_Opt_Read);
auto fdData = thirdFdReader->queryLock(p1timestamp - FD_TOLERENCE, p1timestamp);
if (fdData.size() > 0) {
auto fdChunk = fdData.back();
facedata = fdChunk->thirdFaceData;
if (mDataMetaToAsync.mBeautyLevel > 0 && fdChunk->sensorId == mOpenID) {
setFfdData2App(facedata, pOMetadataApp);
}
}
thirdFdReader->queryUnlock(fdData);
}
}2.3 ：setFfdData2App
流程如下：
- 创建：IMetadata::IEntry faceInfoEntry(third_CONTROL_CAPTURE_FB_FACE_INFO);
- 写入各种FFD数据结构字段：faceInfoEntry.push_back
- 更新meta：pOMetadataApp->update(third_CONTROL_CAPTURE_FB_FACE_INFO, faceInfoEntry);
- APP会去读这个tag拿到meta，并解析各个FFD字段，拿到FFD各种变量。
cpp
void OcamMeta::setFfdData2App(thirdFaceDataAppJoint facedata, IMetadata* pOMetadataApp)
{
MSize fdImgSize(facedata.fdProcessInfo.ImgSize.w, facedata.fdProcessInfo.ImgSize.h);
int face_count = 0;
face_count = facedata.faceInfoOri.face_num;
for (MINT32 i = 0; i < face_count; i++) {
int32_t left = (int32_t)facedata.faceInfoOri.face_roi[i].faceRect.left;
int32_t top = (int32_t)facedata.faceInfoOri.face_roi[i].faceRect.top;
int32_t right = (int32_t)facedata.faceInfoOri.face_roi[i].faceRect.width + left;
int32_t bottom = (int32_t)facedata.faceInfoOri.face_roi[i].faceRect.height + top;
convertCoord(left, top, fdImgSize, facedata.fdProcessInfo);
convertCoord(right, bottom, fdImgSize, facedata.fdProcessInfo);
facedata.faceInfoOri.face_roi[i].faceRect.left = left;
facedata.faceInfoOri.face_roi[i].faceRect.top = top;
facedata.faceInfoOri.face_roi[i].faceRect.width = right - left;
facedata.faceInfoOri.face_roi[i].faceRect.height = bottom - top;
}
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
for (MINT32 j = 0; j < MAX_FFD_NUM; j++) {
convertCoord(facedata.faceInfoOri.ffd_data[i].x[j],
facedata.faceInfoOri.ffd_data[i].y[j],
fdImgSize, facedata.fdProcessInfo);
}
}
for (MINT32 i = 0; i < MAX_FACE_ROIS; i++) {
for (MINT32 j = 0; j < MAX_FFD_NUM_512; j++) {
convertCoord(facedata.ffd296Data.ffdData[i].x[j],
facedata.ffd296Data.ffdData[i].y[j],
fdImgSize, facedata.fdProcessInfo);
}
}
if (pOMetadataApp) {
IMetadata::IEntry faceInfoEntry(third_CONTROL_CAPTURE_FB_FACE_INFO);
int face_num = 0;
faceInfoEntry.push_back(facedata.faceInfoOri.versionId,Type2Type<MINT32>());
face_num = facedata.faceInfoOri.face_num ? facedata.faceInfoOri.face_num : mDataMetaToAsync.mFaceNum;
faceInfoEntry.push_back(face_num,Type2Type<MINT32>());
faceInfoEntry.push_back(facedata.faceInfoOri.master_index,Type2Type<MINT32>());
faceInfoEntry.push_back(facedata.faceInfoOri.points_count,Type2Type<MINT32>());
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.age[i],Type2Type<MINT32>());
}
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.gender[i],Type2Type<MINT32>());
}
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
for (MINT32 j = 0; j < MAX_FFD_NUM; j++) {
faceInfoEntry.push_back(facedata.faceInfoOri.ffd_data[i].x[j],Type2Type<MINT32>());
}
for (MINT32 j = 0; j < MAX_FFD_NUM; j++) {
faceInfoEntry.push_back(facedata.faceInfoOri.ffd_data[i].y[j],Type2Type<MINT32>());
}
for (MINT32 j = 0; j < MAX_FFD_NUM; j++) {
faceInfoEntry.push_back(facedata.faceInfoOri.ffd_data[i].occlusion[j],Type2Type<MINT32>());
}
}
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.yaw[i],Type2Type<MINT32>());
}
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.pitch[i],Type2Type<MINT32>());
}
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.roll[i],Type2Type<MINT32>());
}
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.faceLuma[i],Type2Type<MINT32>());
}
// for decide the back lighting
faceInfoEntry.push_back(facedata.faceInfoOri.faceLumaRatio,Type2Type<MINT32>());
//colorTemperature
faceInfoEntry.push_back(facedata.faceInfoOri.colorTemperature,Type2Type<MINT32>());
//lip_HSV
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM * HSV_CHANNEL_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.lip_HSV[i],Type2Type<MINT32>());
}
//iso
facedata.faceInfoOri.iso = mDataMetaToAsync.mIsoValue;
faceInfoEntry.push_back(facedata.faceInfoOri.iso,Type2Type<MINT32>());
//feature
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.feature[i],Type2Type<MINT32>());
}
//faceid
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.faceid[i],Type2Type<MINT32>());
}
//faceRect
for (MINT32 i = 0; i < MAX_ATTRI_FACE_NUM; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.face_roi[i].faceRect.left,Type2Type<MINT32>());
faceInfoEntry.push_back(facedata.faceInfoOri.face_roi[i].faceRect.top,Type2Type<MINT32>());
faceInfoEntry.push_back(facedata.faceInfoOri.face_roi[i].faceRect.width,Type2Type<MINT32>());
faceInfoEntry.push_back(facedata.faceInfoOri.face_roi[i].faceRect.height,Type2Type<MINT32>());
}
faceInfoEntry.push_back(facedata.faceInfoOri.fdDimensionW,Type2Type<MINT32>());
faceInfoEntry.push_back(facedata.faceInfoOri.fdDimensionH,Type2Type<MINT32>());
// reserve
MINT32 RESERVE_ITEM1 = 4;
// reserve
for (MINT32 i = 0; i < RESERVE_ITEM1; i++) {
faceInfoEntry.push_back(facedata.faceInfoOri.reserve[i],Type2Type<MINT32>());
}
pOMetadataApp->update(third_CONTROL_CAPTURE_FB_FACE_INFO, faceInfoEntry);
// send ffd data to app
IMetadata::IEntry ffdInfoEntry(third_CONTROL_CAPTURE_FFDPOINTS_INFO);
for (MINT32 i = 0; i < MAX_FACE_ROIS; i++) {
for (MINT32 j = 0; j < MAX_FFD_NUM_512; j++) {
ffdInfoEntry.push_back(facedata.ffd296Data.ffdData[i].x[j],Type2Type<MINT32>());
}
for (MINT32 j = 0; j < MAX_FFD_NUM_512; j++) {
ffdInfoEntry.push_back(facedata.ffd296Data.ffdData[i].y[j],Type2Type<MINT32>());
}
for (MINT32 j = 0; j < MAX_FFD_NUM_512; j++) {
ffdInfoEntry.push_back(facedata.ffd296Data.ffdData[i].occlusion[j],Type2Type<MINT32>());
}
}
ffdInfoEntry.push_back(facedata.ffd296Data.pointsCount,Type2Type<MINT32>());
pOMetadataApp->update(third_CONTROL_CAPTURE_FFDPOINTS_INFO, ffdInfoEntry);
}
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