mirror of
https://github.com/torvalds/linux.git
synced 2024-11-05 11:32:04 +00:00
be2a608bd0
Convert files within the Documentation directory to UTF-8. Adrian Bunk: small additional fixes Signed-off-by: John Anthony Kazos Jr. <jakj@j-a-k-j.com> Signed-off-by: Adrian Bunk <bunk@stusta.de>
130 lines
4.5 KiB
Plaintext
130 lines
4.5 KiB
Plaintext
Vaio Picturebook Motion Eye Camera Driver Readme
|
|
------------------------------------------------
|
|
Copyright (C) 2001-2004 Stelian Pop <stelian@popies.net>
|
|
Copyright (C) 2001-2002 Alcôve <www.alcove.com>
|
|
Copyright (C) 2000 Andrew Tridgell <tridge@samba.org>
|
|
|
|
This driver enable the use of video4linux compatible applications with the
|
|
Motion Eye camera. This driver requires the "Sony Laptop Extras" driver (which
|
|
can be found in the "Misc devices" section of the kernel configuration utility)
|
|
to be compiled and installed (using its "camera=1" parameter).
|
|
|
|
It can do at maximum 30 fps @ 320x240 or 15 fps @ 640x480.
|
|
|
|
Grabbing is supported in packed YUV colorspace only.
|
|
|
|
MJPEG hardware grabbing is supported via a private API (see below).
|
|
|
|
Hardware supported:
|
|
-------------------
|
|
|
|
This driver supports the 'second' version of the MotionEye camera :)
|
|
|
|
The first version was connected directly on the video bus of the Neomagic
|
|
video card and is unsupported.
|
|
|
|
The second one, made by Kawasaki Steel is fully supported by this
|
|
driver (PCI vendor/device is 0x136b/0xff01)
|
|
|
|
The third one, present in recent (more or less last year) Picturebooks
|
|
(C1M* models), is not supported. The manufacturer has given the specs
|
|
to the developers under a NDA (which allows the development of a GPL
|
|
driver however), but things are not moving very fast (see
|
|
http://r-engine.sourceforge.net/) (PCI vendor/device is 0x10cf/0x2011).
|
|
|
|
There is a forth model connected on the USB bus in TR1* Vaio laptops.
|
|
This camera is not supported at all by the current driver, in fact
|
|
little information if any is available for this camera
|
|
(USB vendor/device is 0x054c/0x0107).
|
|
|
|
Driver options:
|
|
---------------
|
|
|
|
Several options can be passed to the meye driver using the standard
|
|
module argument syntax (<param>=<value> when passing the option to the
|
|
module or meye.<param>=<value> on the kernel boot line when meye is
|
|
statically linked into the kernel). Those options are:
|
|
|
|
forcev4l1: force use of V4L1 API instead of V4L2
|
|
|
|
gbuffers: number of capture buffers, default is 2 (32 max)
|
|
|
|
gbufsize: size of each capture buffer, default is 614400
|
|
|
|
video_nr: video device to register (0 = /dev/video0, etc)
|
|
|
|
Module use:
|
|
-----------
|
|
|
|
In order to automatically load the meye module on use, you can put those lines
|
|
in your /etc/modprobe.conf file:
|
|
|
|
alias char-major-81 videodev
|
|
alias char-major-81-0 meye
|
|
options meye gbuffers=32
|
|
|
|
Usage:
|
|
------
|
|
|
|
xawtv >= 3.49 (<http://bytesex.org/xawtv/>)
|
|
for display and uncompressed video capture:
|
|
|
|
xawtv -c /dev/video0 -geometry 640x480
|
|
or
|
|
xawtv -c /dev/video0 -geometry 320x240
|
|
|
|
motioneye (<http://popies.net/meye/>)
|
|
for getting ppm or jpg snapshots, mjpeg video
|
|
|
|
Private API:
|
|
------------
|
|
|
|
The driver supports frame grabbing with the video4linux API
|
|
(either v4l1 or v4l2), so all video4linux tools (like xawtv)
|
|
should work with this driver.
|
|
|
|
Besides the video4linux interface, the driver has a private interface
|
|
for accessing the Motion Eye extended parameters (camera sharpness,
|
|
agc, video framerate), the shapshot and the MJPEG capture facilities.
|
|
|
|
This interface consists of several ioctls (prototypes and structures
|
|
can be found in include/linux/meye.h):
|
|
|
|
MEYEIOC_G_PARAMS
|
|
MEYEIOC_S_PARAMS
|
|
Get and set the extended parameters of the motion eye camera.
|
|
The user should always query the current parameters with
|
|
MEYEIOC_G_PARAMS, change what he likes and then issue the
|
|
MEYEIOC_S_PARAMS call (checking for -EINVAL). The extended
|
|
parameters are described by the meye_params structure.
|
|
|
|
|
|
MEYEIOC_QBUF_CAPT
|
|
Queue a buffer for capture (the buffers must have been
|
|
obtained with a VIDIOCGMBUF call and mmap'ed by the
|
|
application). The argument to MEYEIOC_QBUF_CAPT is the
|
|
buffer number to queue (or -1 to end capture). The first
|
|
call to MEYEIOC_QBUF_CAPT starts the streaming capture.
|
|
|
|
MEYEIOC_SYNC
|
|
Takes as an argument the buffer number you want to sync.
|
|
This ioctl blocks until the buffer is filled and ready
|
|
for the application to use. It returns the buffer size.
|
|
|
|
MEYEIOC_STILLCAPT
|
|
MEYEIOC_STILLJCAPT
|
|
Takes a snapshot in an uncompressed or compressed jpeg format.
|
|
This ioctl blocks until the snapshot is done and returns (for
|
|
jpeg snapshot) the size of the image. The image data is
|
|
available from the first mmap'ed buffer.
|
|
|
|
Look at the 'motioneye' application code for an actual example.
|
|
|
|
Bugs / Todo:
|
|
------------
|
|
|
|
- the driver could be much cleaned up by removing the v4l1 support.
|
|
However, this means all v4l1-only applications will stop working.
|
|
|
|
- 'motioneye' still uses the meye private v4l1 API extensions.
|