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Laurent Pinchart 2d5a369b2c v4l2: Relicense V4L2 compatibility layer under LGPL
The V4L2 compatibility layer is licensed under the GPL. It is compiled
as a binary separate from libcamera.so, and is loaded into the address
space of processes through LD_PRELOAD to intercept calls to the C
library.

It is our understanding and intent that the GPL license doesn't
propagate to the binaries whose calls are intercepted, considering those
binaries are not derivative work of the V4L2 compatibility layer and are
not designed to be linked to the V4L2 compatibility layer. There is
however a possibly grey area if binaries are packaged with a shell
script wrapper that loads the V4L2 compatibility layer. This could lead
to license-related issues if such packaging is performed by Linux
distributions or system integrators.

To clarify the intent and lift the doubts, relicense the V4L2
compatibility layer under the LGPL. The V4L2 compatibility layer code
itself still benefits from the license protection, while its usage with
third-party binaries is clearly allowed as intended.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Acked-by: Paul Elder <paul.elder@ideasonboard.com>
Acked-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Acked-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
2020-05-28 04:31:05 +03:00
Documentation meson: Rename variables storing headers lists 2020-05-18 12:56:20 +03:00
include libcamera: geometry: Set steps to 0 in default SizeRange constructor 2020-05-22 04:54:02 +03:00
LICENSES licenses: License all meson files under CC0-1.0 2020-05-13 16:46:24 +03:00
package/gentoo/media-libs/libcamera licenses: Add SPDX headers to Gentoo ebuild 2020-04-15 19:51:56 +03:00
src v4l2: Relicense V4L2 compatibility layer under LGPL 2020-05-28 04:31:05 +03:00
test test: file-descriptor: Add "fd move" constructor test 2020-05-19 18:08:11 +03:00
utils utils: raspberrypi: ctt: Fix pycodestyle E302 2020-05-13 17:00:25 +03:00
.clang-format licenses: Replace deprecated GPL-2.0 with GPL-2.0-only 2020-04-15 19:51:56 +03:00
.gitignore libcamera: Add Python cache and compiled files to .gitignore 2020-05-01 17:51:59 +03:00
meson.build licenses: License all meson files under CC0-1.0 2020-05-13 16:46:24 +03:00
meson_options.txt licenses: License all meson files under CC0-1.0 2020-05-13 16:46:24 +03:00
README.rst libcamera: Make IPA module signing mandatory for the meantime 2020-04-16 17:37:41 +03:00

.. SPDX-License-Identifier: CC-BY-SA-4.0

.. section-begin-libcamera

===========
 libcamera
===========

**A complex camera support library for Linux, Android, and ChromeOS**

Cameras are complex devices that need heavy hardware image processing
operations. Control of the processing is based on advanced algorithms that must
run on a programmable processor. This has traditionally been implemented in a
dedicated MCU in the camera, but in embedded devices algorithms have been moved
to the main CPU to save cost. Blurring the boundary between camera devices and
Linux often left the user with no other option than a vendor-specific
closed-source solution.

To address this problem the Linux media community has very recently started
collaboration with the industry to develop a camera stack that will be
open-source-friendly while still protecting vendor core IP. libcamera was born
out of that collaboration and will offer modern camera support to Linux-based
systems, including traditional Linux distributions, ChromeOS and Android.

.. section-end-libcamera
.. section-begin-getting-started

Getting Started
---------------

To fetch the sources, build and install:

::

  git clone git://linuxtv.org/libcamera.git
  cd libcamera
  meson build
  ninja -C build install

Dependencies
~~~~~~~~~~~~

The following Debian/Ubuntu packages are required for building libcamera.
Other distributions may have differing package names:

A C++ toolchain: [required]
	Either {g++, clang}

for libcamera: [required]
        meson (>= 0.47) ninja-build python3-yaml

        If your distribution doesn't provide a recent enough version of meson,
        you can install or upgrade it using pip3.

        .. code::

            pip3 install --user meson
            pip3 install --user --upgrade meson

for device hotplug enumeration: [optional]
	pkg-config libudev-dev

for documentation: [optional]
	python3-sphinx doxygen

for gstreamer: [optional]
	libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev

for IPA module signing: [required]
        libgnutls28-dev openssl

for qcam: [optional]
	qtbase5-dev libqt5core5a libqt5gui5 libqt5widgets5

Using GStreamer plugin
~~~~~~~~~~~~~~~~~~~~~~

To use GStreamer plugin from source tree, set the following environment so that
GStreamer can find it.

  export GST_PLUGIN_PATH=$(pwd)/build/src/gstreamer

The debugging tool `gst-launch-1.0` can be used to construct and pipeline and test
it. The following pipeline will stream from the camera named "Camera 1" onto the
default video display element on your system.

.. code::

  gst-launch-1.0 libcamerasrc camera-name="Camera 1" ! videoconvert ! autovideosink

.. section-end-getting-started