Working on SoftISP
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> |
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include | ||
LICENSES | ||
package/gentoo/media-libs/libcamera | ||
src | ||
test | ||
utils | ||
.clang-format | ||
.gitignore | ||
meson.build | ||
meson_options.txt | ||
README.rst |
.. 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