Android Camera 调试常用调式命令

1、CameraService进程信息打印
adb shell dumpsys media.camera
可以获取设计的相机相关信息及状态
CameraService Log等级修改
adb shell dumpsys media.camera -v 1
代码入口是：

frameworks\native\cmds\dumpsys\main.cpp
int main(int argc, char* const argv[]) {
    signal(SIGPIPE, SIG_IGN);
    sp<IServiceManager> sm = defaultServiceManager();
    fflush(stdout);
    if (sm == nullptr) {
        ALOGE("Unable to get default service manager!");
        aerr << "dumpsys: Unable to get default service manager!" << endl;
        return 20;
    }

    Dumpsys dumpsys(sm.get());
    return dumpsys.main(argc, argv);
}

frameworks\native\cmds\dumpsys\dumpsys.cpp

int Dumpsys::main(int argc, char* const argv[]) {
    Vector<String16> services;
    Vector<String16> args;
    ....
    
    for (size_t i = 0; i < N; i++) {
        String16 service_name = std::move(services[i]);
        if (IsSkipped(skippedServices, service_name)) continue;

        sp<IBinder> service = sm_->checkService(service_name);
        if (service != nullptr) {
            ....
            // dump blocks until completion, so spawn a thread..
            std::thread dump_thread([=, remote_end { std::move(remote_end) }]() mutable {
                int err = service->dump(remote_end.get(), args);
            });

         ...
    return 0;
}

进入CameraServic

frameworks\av\services\camera\libcameraservice\CameraService.cpp
status_t CameraService::dump(int fd, const Vector<String16>& args) {
    ...
    dprintf(fd, "\n== Service global info: ==\n\n");
    dprintf(fd, "Number of camera devices: %d\n", mNumberOfCameras);
    dprintf(fd, "Number of normal camera devices: %d\n", mNumberOfNormalCameras);
    String8 activeClientString = mActiveClientManager.toString();
    dprintf(fd, "Active Camera Clients:\n%s", activeClientString.string());
    dprintf(fd, "Allowed user IDs: %s\n", toString(mAllowedUsers).string());
   ...
}

2、查看camera所在进程及运行在那个cpu上

ps –e | grep camera
ps -eo pid,args,psr|grep camera//run on which processor .

3、kernel log抓取：

adb logcat -b kernel -v threadtime > kernel.log 

adb shell cat dev/kmsg | find “3641”//pid

adb logcat -b all > log//userspace and kernel space log

4、java层打印堆栈：

try{
throw new Exception();
} catch(Throwable e){
Log.e("sgj","e.printStackTrace();");
e.printStackTrace();
}

5、执行截图命令：

adb shell /system/bin/screencap -p /sdcard/screenshot.png
adb pull /sdcard/screenshot.png d:/screenshot.png

6、查看进程打开的文件：

adb shell lsof -p 685 >e:\log.txt

7、addr2line工具

addr2line -C -f -e  newcdr 00026cb3

8、内存信息打印

adb shell dumpsys meminfo packagename

9、修改文件的读写权限

chmod 777 build.prop

10、patch添加
git apply –reject xx.patch
11、代码上传主干及分支

git push origin HEAD:refs/for/master
上传分支
git push origin HEAD:refs/for/分支名

12、shell 脚本开关应用

adb shell am start -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -n com.tencent.mobileqq/com.tencent.mobileqq.activity.SplashActivity
adb shell am start -n com.tencent.mobileqq/com.tencent.mobileqq.activity.SplashActivity
adb shell am force-stop com.some.package

13、sharedpreference数据保存位置：

/data/data/<packagename>/shared_prefs/name of sharedPreference

14、CPP文件中开关log

打开ALOGV: #define LOG_NDEBUG 0
打开ALOGI：#define LOG_NIDEBUG 0
打开ALOGD：#define LOG_NDDEBUG 0
打开全部LOG：#undef NDEBUG

15、qcom HAL3 log开关

//打开等级为LEVEL: logInfoMask; GROUP: 0x80 即CamxLogGroupHAL LOG;
adb shell "echo logInfoMask=0x80 >> /vendor/etc/camera/camxoverridesettings.txt"
//打开所有chi log，bit 0 - error, bit 1 - warning, bit 2 - info, bit 3 - debug
adb shell "echo overrideLogLevels =15>> /vendor/etc/camera/camxoverridesettings.txt"
//CamxLogGroupHAL定义在vendor\qcom\proprietary\camx\src\utils\camxtypes.h
//CamxLogInfo定义在vendor\qcom\proprietary\camx\src\utils\camxtypes.h
//默认值定义在vendor\qcom\proprietary\camx\src\core\camxsettings.xml
//用户重载在camxoverridesettings.txt和camxoverridesettingsprivate.txt

16、qcom hal3 kernel log 开关

adb shell "echo 0x10 > /sys/module/cam_debug_util/parameters/debug_mdl"

17、x =（m+n-1）&~(n-1)
意思是

x=m/n*n+(m%n==0)?0:n;