[RK3288][Android6.0] 调试笔记 --- Camera没有权限打开问题

Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92

其实这个问题的本质是音频引起的，但是一开始我往Camera方向查找了，因为测试报给我是说是Camera打开失败，于是我就搜关键字，查看Log：

07-31 19:31:33.962  1152  1236 I CameraService: CameraService::connect call (PID 1073 "com.xxx.msgservice", camera ID 0) for HAL version default and Camera API version 1
07-31 19:31:33.962  1152  1236 E CameraService: 1111 CameraService::connect X (PID 1073) rejected (cannot connect from device user 0, currently allowed device users: )
07-31 19:31:33.962  1152  1236 E CameraService: CameraService::connect X (PID 1073) rejected (cannot connect from device user 0, currently allowed device users: )

提示Camera打开无权限，apk用的api版本是23不会有Anroid6.0的权限问题，而之前apk使用也正常的，本着研究的精神，追查了下currently allowed device users对应的值是多少。
其实记录这个内容也是想提及一下多用户的内容，等以后有时间再研究吧，这里就看看调用流程。
SystemServer在启动过程中会调用ActivityManagerService的systemReady()函数，

systemReady -> ActivityManagerService.java
　mSystemServiceManager.startUser ->
　　startUser -> SystemServiceManager.java
　　　service.onStartUser -> //调动各个Service包括CameraService在内, mCurrentUserId正是当前的用户id
　　　　onStartUser -> CameraService.java
　　　　　switchUserLocked ->
　　　　　　notifyMediaserverLocked -> //注意参数是USER_SWITCHED
　　　　　　　mCameraServiceRaw.notifySystemEvent //通过binder调用native层的CameraService
　　　　　　　　doUserSwitch -> CameraService.cpp
　　　　　　　　　mAllowedUsers = std::move(newAllowedUsers); //这时mAllowedUsers被新的userid替换

另一边，当Camera　Client去连接Camera Service想打开Camera时，需要先申请权限：

status_t CameraService::validateConnectLocked(const String8& cameraId, /*inout*/int& clientUid)
const {

    // Only allow clients who are being used by the current foreground device user, unless calling
    // from our own process.
    //可以看到mAllowedUsers.find(clientUserId)和mAllowedUsers.end()比较
    //前者传进来是当前user为０，　而mAllowedUsers.end()理论根据你前面正常流程得到的userid也为０．
    //如果不相等，那么就申请权限失败而导致Camera无法打开了。
    if (callingPid != getpid() && (mAllowedUsers.find(clientUserId) == mAllowedUsers.end())) {
        ALOGE("CameraService::connect X (PID %d) rejected (cannot connect from "
                "device user %d, currently allowed device users: %s)", callingPid, clientUserId,
                toString(mAllowedUsers).string());
        return PERMISSION_DENIED;
    }
｝

以上部分是用户的switch过程，正常情况应该是成功的，那么问题出在哪里呢？
系统开机mediaserver默认会先去打开关闭测试一次Camera，所以我在两次打开时加了打印当前mAllowedUsers的log:

07-31 19:31:29.940   215   215 I CameraService: CameraService::connect call (PID 215 "media", camera ID 1) for HAL version default and Camera API version 1
07-31 19:31:29.940   215   215 E CameraService: 1111 CameraService::connect X (PID 215) rejected (cannot connect from device user 0, currently allowed device users: 0)
07-31 19:31:29.940   215   215 E CameraService: getCameraPriorityFromProcState: Received invalid process state -1 from ActivityManagerService!

而到调用apk的时候，mAllowedUsers的值为空了，如最前面的log所示。查看两者中间的log,发现Audio模块好多error log:

07-31 19:31:30.770   215   318 E alsa_mixer: mixer_open() Can not open /dev/snd/controlC0 for card 0
07-31 19:31:30.770   215   318 D alsa_route: route_set_controls() set route 0
07-31 19:31:30.770   215   318 E alsa_route: route_set_controls() mMixer is NULL!

怀疑Audio模块加载有问题，查看kernel log:

[    2.177151] RT5631 Audio Codec 0.01 alsa 1.0.26
[    2.177799] RT5631 probe error
[    2.177813] rt5631: probe of 2-001a failed with error -11
[    2.178268] rockchip-spdif ff8b0000.rockchip-spdif: spdif ready.
[    2.178457] of_get_named_gpio_flags exited with status 231
[    2.178516] rockchip-rt5631 rockchip-rt5631.26: ASoC: CODEC (null) not registered

果然加载没成功，看上去应该是硬件问题了～
一个Audio模块加载失败引发的表面Camera用户权限申请失败问题。

来源：CSDN

作者：KrisFei

链接：https://blog.csdn.net/kris_fei/article/details/76468028

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