tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1.. SPDX-License-Identifier: GPL-2.0
2
3.. include:: <isonum.txt>
4
5Vaio Picturebook Motion Eye Camera Driver
6=========================================
7
8Copyright |copy| 2001-2004 Stelian Pop <stelian@popies.net>
9
10Copyright |copy| 2001-2002 Alcôve <www.alcove.com>
11
12Copyright |copy| 2000 Andrew Tridgell <tridge@samba.org>
13
14Private API
15-----------
16
17The driver supports frame grabbing with the video4linux API,
18so all video4linux tools (like xawtv) should work with this driver.
19
20Besides the video4linux interface, the driver has a private interface
21for accessing the Motion Eye extended parameters (camera sharpness,
22agc, video framerate), the snapshot and the MJPEG capture facilities.
23
24This interface consists of several ioctls (prototypes and structures
25can be found in include/linux/meye.h):
26
27MEYEIOC_G_PARAMS and MEYEIOC_S_PARAMS
28 Get and set the extended parameters of the motion eye camera.
29 The user should always query the current parameters with
30 MEYEIOC_G_PARAMS, change what he likes and then issue the
31 MEYEIOC_S_PARAMS call (checking for -EINVAL). The extended
32 parameters are described by the meye_params structure.
33
34
35MEYEIOC_QBUF_CAPT
36 Queue a buffer for capture (the buffers must have been
37 obtained with a VIDIOCGMBUF call and mmap'ed by the
38 application). The argument to MEYEIOC_QBUF_CAPT is the
39 buffer number to queue (or -1 to end capture). The first
40 call to MEYEIOC_QBUF_CAPT starts the streaming capture.
41
42MEYEIOC_SYNC
43 Takes as an argument the buffer number you want to sync.
44 This ioctl blocks until the buffer is filled and ready
45 for the application to use. It returns the buffer size.
46
47MEYEIOC_STILLCAPT and MEYEIOC_STILLJCAPT
48 Takes a snapshot in an uncompressed or compressed jpeg format.
49 This ioctl blocks until the snapshot is done and returns (for
50 jpeg snapshot) the size of the image. The image data is
51 available from the first mmap'ed buffer.
52
53Look at the 'motioneye' application code for an actual example.