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Diffstat (limited to 'Documentation/video4linux/meye.txt')
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diff --git a/Documentation/video4linux/meye.txt b/Documentation/video4linux/meye.txt new file mode 100644 index 000000000..a051152ea --- /dev/null +++ b/Documentation/video4linux/meye.txt @@ -0,0 +1,123 @@ +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: + + 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.d/meye.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, + 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: +------------ + + - 'motioneye' still uses the meye private v4l1 API extensions. |