What does uvc_frame_info structure represent

[sheraz045]

Hi,
I wanted to understand uvc_frame_info structure

struct uvc_frame_info {
unsigned int width;
unsigned int height;
unsigned int intervals[8];
};

static const struct uvc_frame_info uvc_frames_yuyv[] = {
{
640,
360,
{666666, 10000000, 50000000, 0},
},

what does {666666, 10000000, 50000000, 0}, represent even though intervals has 8 values why only four are filled

[kbingham]

The intervals[8] represents a list of up to 8 possible frame intervals.

It's a value in 100ns units, but the '0' means the end of the list. So only the first three 'frame intervals' are valid.

[sheraz045]

Okay So
666666 represents 15FPS ( 15 fps = 1 / 15 * 10 000 000 = 666 666 )

then what is fps for the below values
10000000, 50000000

[kbingham]

I believe so yes.

[kbingham]

That would make them 1 and ... 0.2 FPS ... So ... the values might all need validating
0.2 FPS would be one frame every 5 seconds ?

I guess that means a long exposure? ... Where are these values from ?

Aha, I see them being used here:

uvc-gadget/uvc-gadget.c

Line 122 in 743a050

{666666, 10000000, 50000000, 0},

[sheraz045]

I wanted to test 60FPS for that changing the below line from
{666666, 10000000, 50000000, 0},
to
{166666, 10000000, 50000000, 0},
is this sufficient or any other change required

[kbingham]

Test it and see.

But this wlhe version of the code is quite old I think. There might be a lot of other factors to consider.
Have you already got a successful stream set up?

[sheraz045]

i am testing it, if you say it is quite old is there any new version of this code and i am working on Linux version 4.19.0

[wlhe]

i am testing it, if you say it is quite old is there any new version of this code and i am working on Linux version 4.19.0

Upstream repository latest version: https://git.ideasonboard.org/uvc-gadget.git