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