Android Camera2可执行文件无法获取帧

Question

I have one Camera2 NDK code to open the camera and get images.

The code work fine via Android Application/Service, but if I compile and run it as executable the camera opened but I don't get any frames.

Any idea? someone succeeded to do it?

---

NOTE

1. I create my own AImageReader via "AImageReader_new"
2. I create my own ANativeWindow via "AImageReader_getWindow"

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NOTE2 (ADDED)

The calls is a little different

For Android Application/Service the calls like:

public void onCreate() {
       JNIBridge.startPreview(null);
}
public void onDestroy() {
       JNIBridge.stopPreview();
}

For the executable:

int main()
{
Java_com_y30_nativecamera2_JNIBridge_startPreview(nullptr, nullptr, nullptr);

for(int i = 0; i < 10; ++i)
{
    std::this_thread::sleep_for(std::chrono::milliseconds(1000));
}

Java_com_y30_nativecamera2_JNIBridge_stopPreview(nullptr, nullptr);

return 0;
}

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UPDATE

I tested it again on multi Android devices.

S8/S9+ (With Andorid 8.0.0) it's reproduce.("ACameraManager_openCamera" status is OK, but I don't get any frames)

Pixel (With Android 9) the method "ACameraManager_openCamera" failed.

10-09 10:45:04.933   933  1592 I CameraService: CameraService::connect call (PID -1 "", camera ID 0) for HAL version default and Camera API version 2
10-09 10:45:04.933   933  1592 W ServiceManager: Permission failure: android.permission.CAMERA from uid=2000 pid=19606
10-09 10:45:04.933   933  1592 E CameraService: Permission Denial: can't use the camera pid=19606, uid=2000
10-09 10:45:04.933 19606 19606 E ACameraManager: openCamera: connect camera device failed: Status(-8): '1: validateClientPermissionsLocked:906: Caller "" (PID 2000, UID 19606) cannot open camera "0" without camera permission'

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UPDATE2

I tested it also with msm8996 EVB (With Android 7.1.1):

(1) I get permission issue like the Pixel2.

(2) I ran it with su and the permission issue fixed (the camera opened) but I already don't get any images.

Answer 1

I have not seen your code. From your description, you have done everything right. If you add the following, it should work.

#include <binder/ProcessState.h>

...
main()
{
...
    android::ProcessState::self()->startThreadPool();
...
    Camera open, AImageReader_new, etc ...
...
    Close Camera
...
}

Also add libbinder to Android.mk LOCAL_SHARED_LIBRARIES.

Answer 2

通常，NDK不支持Android Shell可执行文件，因此设备SELinux策略可能会以某种方式阻止其使用。