android怎样才能自动关闭uvc相机服务的功能呢

Platform: RK3288

OS: Android 6.0

Kernel: 3.10.92

Kernel层:

打开UVC的宏

CONFIG_USB_VIDEO_CLASS=y

这个宏一般默认是配好的.

编译下载插上u*** camera开机之后应该会有类似如下log:

[    3.612836] u*** 3-1: New USB device found, idVendor=058f, idProduct=3822

[    3.612857] u*** 3-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0

[    3.612867] u*** 3-1: Product: USB 2.0 HD Camera

[    3.614985] uvcvideo: Found UVC 1.00 device USB 2.0 HD Camera  (058f:3822)

[    3.622648] input: USB 2.0 HD Camera  as /devices/ff540000.u***/u***3/3-1/3-1:1.0/input/input3

查看设备是否注册成功:

shell@rk3288:/ $ ls /dev/video*

/dev/video0

/dev/video1

/dev/video_state

video0是CIF camera, video1就是UVC Camera了.

HAL层:

系统默认只支持1颗Camera, 所以第二颗即使驱动注册成功,上层也无法识别到,

因此修改如下:

int camera_device_open(const hw_module_t* module, const char* name,

hw_device_t** device)

{

......

if (name != NULL) {

cameraid = atoi(name);

if(cameraid > gCamerasNumber) {

LOGE("camera service provided cameraid out of bounds, "

"cameraid = %d, num supported = %d",

cameraid, gCamerasNumber);

rv = -EINVAL;

goto fail;

}

/*Kris, Support two cameras. {*/

#if 0

if(gCamerasOpen >= CAMERAS_SUPPORTED_SIMUL_MAX) {

LOGE("maximum number(%d) of cameras already open",gCamerasOpen);

rv = -EUSERS;

goto fail;

}

#endif

/*Kris, Support two cameras. }*/

......

}这样就可以了!

注意:

RK3288目前不支持高清类型的也就是说mjpeg数据格式的UVC Camera,需要用YUYV格式的.

最快的区分方法是查看HAL层log, code会读取数据格式并打印出来.

01-01 12:03:15.420   216   578 D CameraHal: CameraHal(121): it is a uvc camera!

01-01 12:03:15.420   216   578 D CameraHal: Calling process is: com.android.camera2

01-01 12:03:15.465   216   578 D CameraHal: cameraCreate(374): Camera driver: uvcvideo   Driver version: 3.10.0  CameraHal version: 1.55.2

01-01 12:03:15.465   216   578 D CameraHal: cameraCreate(381): mCamDriverSupportFmt: fmt = 1448695129,index = 0

01-01 12:03:15.465   216   578 D CameraHal: cameraCreate(419): cameraCreate(419): mCamDriverPreviewFmt(YUYV) is cameraHal and camera driver is also supported!! 01-01 12:03:15.465   216   578 D CameraHal: cameraCreate(421): mCamDriverPreviewFmt  = 1448695129 01-01 12:03:15.465   216   578 D CameraHal: cameraCreate(427): cameraCreate(427): Current driver is uvcvideo, v4l2 memory is V4L2_MEMORY_MMAP