topic Re: How to register my camera? in i.MX Processors

How to register my camera?

jiangshao — Tue, 23 Sep 2014 03:24:12 GMT

When I connect WebCamera(Logitech C170) to Demo board（sabresd_6dq-eng 4.2.2）,

I can see the following messages:

<6>usb 2-1.4.4: new high speed USB device number 9 using fsl-ehci

<6>uvcvideo: Found UVC 1.00 device Webcam C170 (046d:082b)

<6>input: Webcam C170 as /devices/platform/fsl-ehci.1/usb2/2-1/2-1.4/2-1.4.4/2-1

.4.4:1.0/input/input6

And the device is /dev/video2

(file video0,video1 exist,but hardware not installed)

But when I use

int cameraCount = Camera.getNumberOfCameras();

to get the count of cameras.

It always returns zero....

How to register my camera?

Re: How to register my camera?

saurabh206 — Tue, 23 Sep 2014 03:45:28 GMT

Hi,

Jiang

Are you using Android BSP?

Re: How to register my camera?

jiangshao — Tue, 23 Sep 2014 05:20:21 GMT

Thank you for your reply.

No, I am learning development of BSP.

Re: How to register my camera?

jiangshao — Tue, 23 Sep 2014 07:39:24 GMT

Use LegacyCamera时，I can see the following messages：

01-02 08:07:40.350: V/CameraHolder(4024): open camera 0

01-02 08:07:40.350: E/CameraService(2229): Camera HAL module not loaded

01-02 08:07:40.350: E/CameraHolder(4024): fail to connect Camera

01-02 08:07:40.350: E/CameraHolder(4024): java.lang.RuntimeException: Fail to connect to camera service

01-02 08:07:40.350: E/CameraHolder(4024): at android.hardware.Camera.native_setup(Native Method)

01-02 08:07:40.350: E/CameraHolder(4024): at android.hardware.Camera.<init>(Camera.java:340)

01-02 08:07:40.350: E/CameraHolder(4024): at android.hardware.Camera.open(Camera.java:302)

01-02 08:07:40.350: E/CameraHolder(4024): at com.android.camera.CameraHolder.open(CameraHolder.java:131)

01-02 08:07:40.350: E/CameraHolder(4024): at com.android.camera.Util.openCamera(Util.java:267)

01-02 08:07:40.350: E/CameraHolder(4024): at com.android.camera.Camera$4.run(Camera.java:1100)

01-02 08:07:40.350: E/CameraHolder(4024): at java.lang.Thread.run(Thread.java:856)

I tried to modify com.android.camera.Camera/Camera.java，let it open camera2，but failed.

01-02 09:26:30.690: V/CameraHolder(4896): open camera 2

01-02 09:26:30.690: W/audio_hw_primary(2229): out_write_primary

01-02 09:26:30.690: E/CameraService(2229): Camera HAL module not loaded

01-02 09:26:30.690: E/CameraHolder(4896): fail to connect Camera

01-02 09:26:30.690: E/CameraHolder(4896): java.lang.RuntimeException: Fail to connect to camera service

01-02 09:26:30.690: E/CameraHolder(4896): at android.hardware.Camera.native_setup(Native Method)

01-02 09:26:30.690: E/CameraHolder(4896): at android.hardware.Camera.<init>(Camera.java:340)

01-02 09:26:30.690: E/CameraHolder(4896): at android.hardware.Camera.open(Camera.java:302)

01-02 09:26:30.690: E/CameraHolder(4896): at com.android.camera.CameraHolder.open(CameraHolder.java:131)

01-02 09:26:30.690: E/CameraHolder(4896): at com.android.camera.Util.openCamera(Util.java:267)

01-02 09:26:30.690: E/CameraHolder(4896): at com.android.camera.Camera$4.run(Camera.java:1105)

01-02 09:26:30.690: E/CameraHolder(4896): at java.lang.Thread.run(Thread.java:856)

Does anyone know why?

Re: How to register my camera?

igorpadykov — Tue, 23 Sep 2014 09:56:11 GMT

Hi jiang

if you are learning you may be interested to run unit-test with this camera

android-imx6-kitkat/0433-ENGR00291326-mx6-Add-USB-camera-unit-test.patch at master · rabeeh/android-imx6-kitkat · GitHub

Best regards

igor

Re: How to register my camera?

jiangshao — Wed, 15 Oct 2014 05:44:19 GMT

这个问题找到了解决办法，我写下来，希望对有同样的疑问的人有帮助

首先，开机后通过logcat如下log

01-01 08:00:04.220: I/CameraService(2227): CameraService started (pid=2227)

01-01 08:00:04.220: E/CameraService(2227): Could not load camera HAL module

它是CameraService.cpp输出的，也就是service启动了，但是hw_get_module失败了

if (hw_get_module(CAMERA_HARDWARE_MODULE_ID,

(const hw_module_t **)&mModule) < 0) {

ALOGE("Could not load camera HAL module");

mNumberOfCameras = 0;

}

之后调查mx6/libcamera下的Android.mk发现，BOARD_HAVE_IMX_CAMERA为true时才会编译。

于是把/device/fsl/imx6/BoardConfigCommon.mk中的BOARD_HAVE_IMX_CAMERA改为了true。

编译安卓后libcameraservice.so就会被生成了

将生成的ramdisk.img解压到某个目录，然后修改init.freescale.rc

将back_camera改写成uvc

setprop back_camera_name uvc

重新打包ramdisk.img后打包boot.img

烧写boot.img, system.img，启动后，有两个camera的图标(估计是一个前置，一个后置)。其中一个点击后，可以启动摄像头实现拍照和录像