高通 Camera HAL3：项目开发技术点总结

做高通 Camera HAL3开发的一些技术点的总结、整理。

做个记录，方便后续查阅。

1.目录、so、配置文件

productName是项目名

out Target路径：\out\target\product\productName\

chi-cdk：\vendor\qcom\proprietary\chi-cdk\

ldc node：\vendor\qcom\proprietary\chi-cdk\oem\qcom\node\ldc\

node编译出来的so：\vendor\lib64\camera\components\

usecase编译的so: \vendor\lib64\com.qti.chiusecaseselector.so (修改pipeline的xml后需要编译usecase的so)

chi-cdk编译的so: \vendor\lib64\hw\com.qti.chi.override.so

usecase xml文件：chi-cdk\oem\qcom\topology\titan\fillmore\fillmore_usecase.xml

pipelines xml文件：chi-cdk\oem\qcom\topology\titan\usecase-components\usecases\UsecaseZSL\pipelines\

vendortag文件：chi-cdk\oem\qcom\vendortag\chivendortagoemdefines.h

RealTimeFeature.xml：chi-cdk\oem\qcom\topology\titan\usecase-components\segments\fillmore\RealTimeFeature.xml

camxoverridesettings.txt：高通提供给开发者的临时调试方式，控制log打印、数据dump等、在设备目录的vendor/etc/camera/下，目录camera和camxoverridesettings.txt都需要自己手动创建

2.驱动相关路径：

bin文件：/vendor/lib64/camera (如果将bin文件删除到只剩一个，那么驱动上电就只上一个，打开相机就只打开这个摄像头)

配置文件：

\vendor\qcom\proprietary\chi-cdk\oem\qcom\buildbins\build\android\binary_taro

/vendor/qcom/proprietary/chi-cdk/oem/qcom/module

驱动文件：

\vendor\qcom\proprietary\chi-cdk\oem\qcom\sensor\s5khm6

3.camxsettings.xml

在/vendor/qcom/proprietary下查找camxsettings.xml，找到后通过修改camxoverridesettings.txt来改变camxsettings.xml中定义的变量的值

/vendor/etc/camera # echo enableDSM=FALSE >> camxoverridesettings.txt

/vendor/etc/camera # cat camxoverridesettings.txt

4.camxoverridesettings.txt日志设置：

chi log:例如:CHX_LOG_ERROR(fmt, args)；

adb shell "echo overrideLogLevels=0x1f >> /vendor/etc/camera/camxoverridesettings.txt"

或：adb shell setprop vendor.debug.camera.overrideLogLevels 0x1F (camxsettings.xml中定义，不同的代码可能有区别)

平常开的log(按需要开，全部都开会丢日志且影响性能):

hal/core/chi

adb shell "echo logInfoMask=0x50080 >> /vendor/etc/camera/camxoverridesettings.txt" 　　

adb shell setprop persist.vendor.camera.logVerboseMask 0xFFFFFFFF

adb shell setprop persist.vendor.camera.logEntryExitMask 0xFFFFFFFF

adb shell setprop persist.vendor.camera.logInfoMask 0xFFFFFFFF

adb shell setprop persist.vendor.camera.logWarningMask 0xFFFFFFFF

adb shell setprop persist.vendor.camera.logConfigMask 0xFFFFFFFF

adb shell setprop persist.vendor.camera.systemLogEnable TRUE

adb shell setprop persist.vendor.camera.logLogDRQMask 0xFFFFFFFF

camx log:

adb shell "echo overrideLogLevels=0xF >> /vendor/etc/camera/camxoverridesettings.txt"

adb shell "echo logVerboseMask=0x1000 >> /vendor/etc/camera/camxoverridesettings.txt"

adb shell "echo logInfoMask=0xFFFFFFFF >> /vendor/etc/camera/camxoverridesettings.txt"

5.选择featuregraph的日志：

Chifeature2graphselector.cpp:1549 SelectFeatureGraphforRequestFromTable()

Tag:"Selected feature graph for request:"

通常需要先执行如下命令才能打印出Log：

adb shell echo "overrideLogLevels=0x9" >>/vendor/etc/camera/camxoverridesettings.txt

adb shell echo overrideLogLevels=8 >>echo/vendor/etc/camera/camxoverridesettings.txt

平台不同，具体也有所区别：

8350:

static const UINT32 CHX LOG CONFIG MASK =4:

adb shell echo overrideLogLevels=4 >>/vendor/etc/camera/camxoverridesettings.txt

8450:

adb shell overrideLogLevels=8 >>"echo/vendor/etc/camera/camxoverridesettings.txt

CHX LOG INFO("Selected feature graph for request %u : %spFeature2RequestObject->GetAppFrameNumber ()，requestGraph. pGraphDesc->pFeatureGraphName);

sm4350:

adb shell "echo overrideLogLevels=4>>/vendor/etc/camera/camxoverridesettings.txt

CHX LOG CONFIG(Feature2Mapping: Selected feature graph : %s"pChiFeature2GraphDesc->pFeatureGraphName);

6.如何查找pipeline

代码查找：

找到chifeature2rawhdrdescriptor.cpp

查找ChiFeature2PipelineDescriptor

日志查找：

Tag: "StreamingOn"

7.CreatePipelines()

AdvancedCameraUsecase，UsecaseMultiCamera等usecase 会调用CreatePipelines()创建 pipeline

chifeature2也会调用 CreatePipelines() 创建 pipeline

举个例子:

在SAT模式下，预览走的是非featue2，拍照走的是feature2:

//创建的三个pipeline：SATOfflinePreview；RealtimePreviewSATO；Merge3YuvCustomTolYuv

8. 如何查找pipeline node配置文件：

1.Log TAG:"StreamingOn for pipeline"查当前pipeline
2.\vendor\qcom\proprietary\chi-cdk\oem\qcom\topology\titan 目录下找pipeline的xml
3.pipeline xml里看<CamxInclude segment="xxxxxxxxxx"/>
4.找到CamxInclude的xml
5.添加node

9.添加堆栈打印：

在\camx\src\core\hal\camxhal3stream.cpp中添加堆栈打印

camx/src/lib/build/android/Android.mk 里添加 LOCAL_SHARED_LIBRARIES += libutilscallstack

代码中要打印堆栈的地方添加：android::CallStack stackprintf("xxxxxx");

10.添加一个VendorTag用于控制Feature：

详细见《Add a VendorTag》篇

高通 Camera HAL3：添加一个VendorTag_shawn·xiao的博客-CSDN博客

11.摄像头Id配置文件

chi-cdk\oem\qcom\multicamera\chimcxcameraconfig\configs\fillmore\fillmore_legacymc.xml

12.排查node中算法影响

可以只用memcopy Node来排除：

13.底层添加debug系统属性：

头文件：#include <cutils/properties.h>

\chi-cdk\oem\qcom\node\awrawhdr\build\android\Android.mk下添加：

LOCAL_SHARED_LIBRARIES :=

libcutils \

代码：if(property_get_int32("debug.vendor.camera.dumpawraw",0))

13.查看AEC日志：

主要看第二个

(1).05-14 06:40:13.737 7710 7779 V CamX : [ VERB][STATS_AEC] caecxcontrol.h:586: PrintFrameControl CID 1 role 0 fID 227 mode PerFrame skipped:0 flash off lux 276.5 ISO 640 (short safe long) G 13.319 13.319 13.319 ET 60000000 60000000 60000000 SI 799110720 799110720 799110720 settled 1 brightness settled 1 FL 219.9 snapshot normal LED1 0 LED2 0 LEDAF 0 LEDFD 0 predictive 1.0 flashduration 0 compenDB 1.000 compenADRC 1.000 shortBlend 1.000000 FinalFlickerMode 1

(2) Gain:ExpTime

14.去掉驱动配置的QCFA Size

找到注摄的驱动setting文件

qssi12_7450/vendor/qcom/proprietary/chi-cdk/oem/qcom/sensor/s5khm6/s5khm6_sensor.xml

找到Qcfa定义，全部去掉

15.查找最大，中间，最小曝光值

\chi-cdk\core\chiframework\chimcxdevicecaps.cpp

填曝光值函数：FillExposureTime()

\camx\src\core\camximagesensordata.cpp

从sensor xml中获取配置并计算赋值最小、中间和最大曝光值：GetSensorStaticCapability()

/chi-cdk/oem/qcom/sensor/s5khm6/s5khm6_sensor.xml

驱动配置文件里配置：
<exposureControllnfo>
<verticalOffset>10<verticalOffset>
<maxLineCount>65525<maxLineCount>

16.常见usecase、pipeline

之前的博文中也有列举过，再列举一次

不同机型,产品性能及定位不同,即使基线一样usecase等也有可能不一样,

高通这么做给了手机厂商极大的自定义空间，举个某机型例子，UseCase可以场景复用,对应的pipeline也可以不用或复用

17.文件权限修改

标定结果写入calib_result的patch，文件777权限没有设置成功，导致生成的calib_result文件没有第三方可读权限，

可通过adb shell ls -laZ calib_result查看为-rwx------

如下改动patch，经调试第三方可以读取calib_result，权限变为-rwxrwxrwx:

{mode_t pCurMask = umask(0);......umask(pCurMask);}

18.通过配置camxoverridesettings.txt实现dump yuv和raw

dump raw：

autoImageDumpMask=1
offlineImageDumpOnly=FALSE
reprocessDump=TRUE
autoImageDump=TRUE
autoInputImageDumpMask=0x1
autoImageDumpIFEoutputportMask=0xFB8

dump yuv：

autoImageDumpMask=1
offlineImageDumpOnly=FALSE
reprocessDump=TRUE
autoImageDump=TRUE
autoImageDumpIPEoutputportMask=0x700

19.未完待续、持续补充