Bonjour à tous,
Après avoir cherché comment capturer les données de ma webcam avec la lib uvc, je me heurte au problème suivant "attempt to claim already-claimed interface 1".
La méthode de ma classe dans QtCreator :
/* Initialize a UVC service context. Libuvc will set up its own libusb
* context. Replace NULL with a libusb_context pointer to run libuvc
* from an existing libusb context. */
res
= uvc_init
(&ctx
, NULL
);
if (res
< 0) {
uvc_perror
(res
, "uvc_init");
return res
;
}
puts("UVC initialized");
/* Locates the first attached UVC device, stores in dev */
res
= uvc_find_device
(
ctx
, &dev
,
3141, 25409, NULL
); /* filter devices: vendor_id, product_id, "serial_num" */
//33006, 48, NULL);
//3141, 25409, NULL); /* filter devices: vendor_id, product_id, "serial_num" */
//3141, 25409, "da1b7b94a31315e0");
if (res
< 0) {
uvc_perror
(res
, "uvc_find_device"); /* no devices found */
} else {
puts("Device found");
/* Try to open the device: requires exclusive access */
//Special access : sudo sh -c "echo 'SUBSYSTEMS==\"usb\", ATTRS{idVendor}==\"0c45\", ATTRS{idProduct}==\"6341\", SYMLINK+=\"pt1\", GROUP=\"usb\", MODE=\"666\"' > /etc/udev/rules.d/99-pt1.rules"
res
= uvc_open
(dev
, &devh
);
if (res
< 0) {
uvc_perror
(res
, "uvc_open"); /* unable to open device */
} else {
puts("Device opened");
/* Print out a message containing all the information that libuvc
* knows about the device */
uvc_print_diag
(devh
, stderr
);
/* Try to negotiate a 640x480 30 fps YUYV stream profile */
res
= uvc_get_stream_ctrl_format_size
(
devh
, &ctrl
, /* result stored in ctrl */
UVC_FRAME_FORMAT_YUYV
, /* YUV 422, aka YUV 4:2:2. try _COMPRESSED */
640, 480, 30 /* width, height, fps */
);
/* Print out the result */
uvc_print_stream_ctrl
(&ctrl
, stderr
);
if (res
< 0) {
uvc_perror
(res
, "get_mode"); /* device doesn't provide a matching stream */
} else {
/* Start the video stream. The library will call user function cb:
* cb(frame, (void*) 12345)
*/
res
= uvc_start_streaming
(devh
, &ctrl
, cb
, user_ptr
, 0);
if (res
< 0) {
uvc_perror
(res
, "start_streaming"); /* unable to start stream */
} else {
puts("Streaming...");
uvc_set_ae_mode
(devh
, 1); /* e.g., turn on auto exposure */
QThread
::msleep(10000); /* stream for 10 seconds */
/* End the stream. Blocks until last callback is serviced */
uvc_stop_streaming
(devh
);
puts("Done streaming.");
}
}
/* Release our handle on the device */
uvc_close
(devh
);
puts("Device closed");
}
/* Release the device descriptor */
uvc_unref_device
(dev
);
}
/* Close the UVC context. This closes and cleans up any existing device handles,
* and it closes the libusb context if one was not provided. */
uvc_exit
(ctx
);
puts("UVC exited");
return 0;
Le résultat :
14:47:00: Starting /home/jo/Qt_project/serveur_surveillance/build-serveur_surveillance-Desktop-Debug/serveur_surveillance...
TEST
4 Devices in list.
Number of possible configurations: 1 Device Class: 239 VendorID: 3141 ProductID: 25409
Interfaces: 4 ||| Number of alternate settings: 1 | Interface Number: 0 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 131 | Number of alternate settings: 7 | Interface Number: 1 | Number of endpoints: 0 | Interface Number: 1 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 129 | Interface Number: 1 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 129 | Interface Number: 1 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 129 | Interface Number: 1 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 129 | Interface Number: 1 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 129 | Interface Number: 1 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 129 | Number of alternate settings: 1 | Interface Number: 2 | Number of endpoints: 0 | Number of alternate settings: 2 | Interface Number: 3 | Number of endpoints: 0 | Interface Number: 3 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 132 |
Number of possible configurations: 1 Device Class: 9 VendorID: 7531 ProductID: 2
Interfaces: 1 ||| Number of alternate settings: 1 | Interface Number: 0 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 129 |
Number of possible configurations: 1 Device Class: 0 VendorID: 33006 ProductID: 33
Interfaces: 1 ||| Number of alternate settings: 1 | Interface Number: 0 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 129 |
Number of possible configurations: 1 Device Class: 9 VendorID: 7531 ProductID: 1
Interfaces: 1 ||| Number of alternate settings: 1 | Interface Number: 0 | Number of endpoints: 1 | Descriptor Type: 5 | EP Address: 129 |
unsupported descriptor subtype VS_STILL_IMAGE_FRAME
unsupported descriptor subtype VS_STILL_IMAGE_FRAME
unsupported descriptor subtype VS_COLORFORMAT
DEVICE CONFIGURATION (0c45:6341/[none]) ---
Status: idle
VideoControl:
bcdUVC: 0x0100
VideoStreaming(1):
bEndpointAddress: 129
Formats:
UncompressedFormat(1)
bits per pixel: 16
GUID: 5955593200001000800000aa00389b71 (YUY2)
default frame: 1
aspect ratio: 0x0
interlace flags: 00
copy protect: 00
FrameDescriptor(1)
capabilities: 00
size: 640x480
bit rate: 24576000-147456000
max frame size: 614400
default interval: 1/30
interval[0]: 1/30
interval[1]: 1/25
interval[2]: 1/20
interval[3]: 1/15
interval[4]: 1/10
interval[5]: 1/5
.......................
FrameDescriptor(18)
capabilities: 00
size: 1280x720
bit rate: 73728000-147456000
max frame size: 1843200
default interval: 1/10
interval[0]: 1/10
interval[1]: 1/5
MJPEGFormat(2)
bits per pixel: 0
GUID: 4d4a5047000000000000000000000000 (MJPG)
default frame: 1
aspect ratio: 0x0
interlace flags: 00
copy protect: 00
FrameDescriptor(1)
capabilities: 00
size: 640x480
bit rate: 24599560-147597360
max frame size: 614989
default interval: 1/30
interval[0]: 1/30
interval[1]: 1/25
interval[2]: 1/20
interval[3]: 1/15
interval[4]: 1/10
interval[5]: 1/5
......................
FrameDescriptor(18)
capabilities: 00
size: 1280x720
bit rate: 73751560-442509360
max frame size: 1843789
default interval: 1/30
interval[0]: 1/30
interval[1]: 1/25
interval[2]: 1/20
interval[3]: 1/15
interval[4]: 1/10
interval[5]: 1/5
END DEVICE CONFIGURATION
bmHint: 0001
bFormatIndex: 1
bFrameIndex: 1
dwFrameInterval: 333333
wKeyFrameRate: 0
wPFrameRate: 0
wCompQuality: 0
wCompWindowSize: 0
wDelay: 13646
dwMaxVideoFrameSize: 614400
dwMaxPayloadTransferSize: 3072
bInterfaceNumber: 1
attempt to claim already-claimed interface 1
14:47:01: Le programme s'est terminé subitement.
14:47:01: The process was ended forcefully.
14:47:01: /home/jo/Qt_project/serveur_surveillance/build-serveur_surveillance-Desktop-Debug/serveur_surveillance crashed.
Merci pour votre retour d'expérience.
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