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| montjoie_ | hello | [10:27] |
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montjoie_ is now known as montjoie | [10:28] |
| montjoie | for zoran, I need to write a jpeg header filter, does it already exists one driver doing this ? | [10:30] |
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| *** | svenska has joined #linux-media | [11:28] |
| svenska | hi
i have been trying to use the linux uvc gadget, and for some reason most dequeued buffers have their ERROR flag set | [11:34] |
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| svenska | it appears that the DQBUF ioctl can return buffers before the data has been sent to usb
so i wonder, how do i limit the frame rate at which my frames are output? (i am currently synthesizing images, so i need to limit the frame rate on the sender site.) | [11:36] |
| *** | camus has quit IRC (Remote host closed the connection) | [11:37] |
| svenska | if i am asking in the wrong channel, can you point me somewhere instead? | [11:37] |
| while the /dev/videoN fd is writable [select()], the code will do { ioctl(VIDIOC_DQBUF), fill_buffer(), ioctl(VIDIOC_QBUF) }. ignoring the ERROR flag causes a frame rate of 200~4000 fps (for a 30 fps mode). the O_NONBLOCK flag has no effect, DQBUF does not block in either case. | [11:43] | |
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| svenska | simply adding a delay before doing VIDIOC_QBUF sometimes causes the kernel to panic; i am not sure why | [11:46] |
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| svenska | i am a bit out of ideas here. does someone have knowledge how to use the uvc gadget?
i have seen this behaviour on kernels 4.14, 4.19 and 5.4 - i did not see any significant changes to linux-master when i last checked | [11:47] |
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| svenska | does anyone have any ideas? | [13:18] |
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| pinchartl | svenska: it's the right channel. I haven't been able to do much work on UVC gadget for a few years though, so I can't really help at this point :-S
it's on my long todo list to revive this project, and there has been a couple of occasions when I thought it would happen, but in the end it didn't kbingham: ^^ | [13:32] |
| svenska | Do you have any idea how the gadget is to be used correctly?
By the way, your reference implementation (at ideasonboard) can be viewed online, but I can't seem to clone the repository... (I mean this link: https://git.ideasonboard.org/uvc-gadget.git but don't know if it current.) pinchartl: Sorry if I am annoying. | [13:33] |
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| pinchartl | can you clone git://git.ideasonboard.org/uvc-gadget.git ?
I need to move that server to cgit, gitweb doesn't work well with http it seems you're not annoying :-) I just wish I could dedicate more time to UVC gadget | [13:37] |
| svenska | Yes, I can clone that one correctly.
I used to have a gitweb setup, but the web server would redirect depending on whether the user agent was "git" or not. | [13:39] |
| Hmm, I changed the setup a few years ago to redirect based on the link itself. | [13:44] | |
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miqztee has quit IRC (Remote host closed the connection) | [13:48] |
| kbingham | svenska, what platform are you running on ? | [13:49] |
| svenska | Android.
kbingham: Which is why I can't easily change the kernel a lot. I can chose to use the uvc-gadget as-is, or I can aim for a complete userspace implementation (which seems like a waste of time and effort). | [13:53] |
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| pinchartl | svenska: why can't you change the kernel ? because it's a stock Android device, not a device you are developing ?
(oletko ruotsalainen ? ;-)) | [14:55] |
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| svenska | pinchartl: it is a vendor kernel. the usb gadget routines are unchanged, though.
google's long-term strategy seems to center around a common kernel for all devices (or at least a common kernel for all devices based on a platform). so changes to kernel code are restricted. changes to modules are fine though. so i can't test with kernel 5.12, for example. :) | [15:13] |
| pinchartl | right
is UVC gadget compiled as a module in the Android kernel ? | [15:18] |
| svenska | depends on the device, i guess
i've seen some defconfigs with UAC2 enabled, others with UAC2 disabled, and none with UVC enabled by default generally, the UVC gadget seems to be disabled | [15:20] |
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| NoGuest17 | jo tuxers | [15:50] |
| ezequielg | montjoie: i think there is one.
somewhere. jpeg_parse_frame_header at v4l2_jpeg.c ? sorry, v4l2-jpeg.c i mean | [15:56] |
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| montjoie | ezequielg: thanks I will check it
it seems there are no user in kernel of it:) | [17:18] |
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| montjoie | does I have the right to modify a buffer in vb2_ops.buf_prepare ? | [19:09] |
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| svenska | does anyone actually use the uvc gadget? | [21:39] |
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