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| Who | What | When |
|---|---|---|
| benny-innofaith | Is globbing /dev/video* a reliable way to list all camera devices? | [10:43] |
| ....................................... (idle for 3h11mn) | ||
| I have a problem with this call: v4l2_dv_timings_cap timings;
ioctl(this->m_fd, VIDIOC_DV_TIMINGS_CAP, &timings); ioctl keeps retuning the ENOTTY errorno. I have opened the /dev/video0 file and I expected this function to succeed. How else am I going to set the resolution for capture. | [13:54] | |
| pinchartl | benny-innofaith: that ioctl is supported by TV hardware only, not cameras | [13:55] |
| benny-innofaith | Ah. What API should I use for camera's? | [13:56] |
| pinchartl | VIDIOC_S_FMT to set the pixel format and resolution | [13:57] |
| benny-innofaith | Thank you | [13:58] |
| pinchartl | you're welcome | [14:00] |
| ........... (idle for 51mn) | ||
| benny-innofaith | Is the ioctl(int fd, VIDIOC_ENUM_FMT, struct v4l2_fmtdesc *argp) function also restricted to TV hardware? | [14:51] |
| .... (idle for 15mn) | ||
| Are all pixel formats 32 bits? | [15:06] | |
| pinchartl | VIDIOC_ENUM_FMT should be implemented by cameras
(although it's a bit of a grey area for some drivers) which driver(s) are you using ? | [15:10] |
| benny-innofaith | One moment, checking.
I am using uvcvideo | [15:13] |
| pinchartl | then ENUM_FMT should be supported
and pixel formats are 32 bit, yes | [15:16] |
| benny-innofaith | My code looks like this: http://textuploader.com/ddwj6 I am getting a EINVAL error.
The first ioctl call fails with this error. The entire code: http://textuploader.com/ddwjj | [15:21] |
| pinchartl | you need to set the type field to V4L2_BUF_TYPE_VIDEO_CAPTURE
and make sure you memset the whole structure to 0 inside the loop before each ioctl call | [15:23] |
| benny-innofaith | Whoot! That worked. I am getting the following formats: Motion-JPEG & YUYV 4:2:2 | [15:26] |
| pinchartl | :-)
I have to go I'm afraid have fun :-) | [15:26] |
| benny-innofaith | Bye bye, have a nice day | [15:26] |
| pinchartl | I'll be back in the evening | [15:26] |
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| *** | benjiG has left | [16:43] |
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| awalls1 has left | [22:51] | |
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