Hi,
I have a webcam with two pixel formats:
$ v4l2-ctl --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: 'YUYV'
Name : YUV 4:2:2 (YUYV)
Size: Discrete 640x480
Interval: Discrete 0.040
s (25.000 fps)
Interval: Discrete 0.100
s (10.000 fps)
Interval: Discrete 0.200
s (5.000 fps)
Index : 1
Type : Video Capture
Pixel Format: ''
Name : 20363159-0000-0010-8000-00aa003
Size: Discrete 640x480
Interval: Discrete 0.040
s (25.000 fps)
Interval: Discrete 0.100
s (10.000 fps)
Interval: Discrete 0.200
s (5.000 fps)
The first is 8bit YUYV and the second is 14bit Y6 (FOURCC 0x20363159)
compliant...
But when I try to initiate the device with the following code... fails
(VIDIOC_S_FMT error 22, Invalid argument):
struct v4l2_format fmt;
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = width;
fmt.fmt.pix.height = height;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_Y16 /* that is, FOURCC 0x20363159
pixel_format; */
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt))
errno_exit("VIDIOC_S_FMT");
There is another way to initiate the device indicating the index of the
pixel format I'm interested in (Y16 FOURCC 0x20363159)?
Thanks.
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