.. SPDX-License-Identifier: GPL-2.0
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.. include:: <isonum.txt>
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Vaio Picturebook Motion Eye Camera Driver
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=========================================
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Copyright |copy| 2001-2004 Stelian Pop <stelian@popies.net>
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Copyright |copy| 2001-2002 Alcôve <www.alcove.com>
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Copyright |copy| 2000 Andrew Tridgell <tridge@samba.org>
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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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so all video4linux tools (like xawtv) 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 snapshot 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 and 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 and 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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