76a5861f3e
While installing meson using pip3 install --user meson, due to python path issues, build.ninja can't be located by ninja. meson generates ninja files fine, but then when you run ninja, it is unable to find meson's build.ninja python module due to path issues. It gives the following error on ninja -C build install: ninja: Entering directory `build' ninja: error: loading 'build.ninja': No such file or directory After uninstalling meson using pip3 and installing it again using pip without --user argument solved the issue. Add a troubleshooting section to the readme to describe this issue and suggest possible solutions. Signed-off-by: Vedant Paranjape <vedantparanjape160201@gmail.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
127 lines
3.7 KiB
ReStructuredText
127 lines
3.7 KiB
ReStructuredText
.. SPDX-License-Identifier: CC-BY-SA-4.0
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.. section-begin-libcamera
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===========
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libcamera
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===========
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**A complex camera support library for Linux, Android, and ChromeOS**
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Cameras are complex devices that need heavy hardware image processing
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operations. Control of the processing is based on advanced algorithms that must
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run on a programmable processor. This has traditionally been implemented in a
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dedicated MCU in the camera, but in embedded devices algorithms have been moved
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to the main CPU to save cost. Blurring the boundary between camera devices and
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Linux often left the user with no other option than a vendor-specific
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closed-source solution.
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To address this problem the Linux media community has very recently started
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collaboration with the industry to develop a camera stack that will be
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open-source-friendly while still protecting vendor core IP. libcamera was born
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out of that collaboration and will offer modern camera support to Linux-based
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systems, including traditional Linux distributions, ChromeOS and Android.
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.. section-end-libcamera
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.. section-begin-getting-started
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Getting Started
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---------------
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To fetch the sources, build and install:
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::
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git clone git://linuxtv.org/libcamera.git
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cd libcamera
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meson build
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ninja -C build install
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Dependencies
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~~~~~~~~~~~~
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The following Debian/Ubuntu packages are required for building libcamera.
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Other distributions may have differing package names:
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A C++ toolchain: [required]
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Either {g++, clang}
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Meson Build system: [required]
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meson (>= 0.55) ninja-build pkg-config
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If your distribution doesn't provide a recent enough version of meson,
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you can install or upgrade it using pip3.
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.. code::
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pip3 install --user meson
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pip3 install --user --upgrade meson
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for the libcamera core: [required]
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python3-yaml python3-ply python3-jinja2
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for IPA module signing: [required]
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libgnutls28-dev openssl
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for the Raspberry Pi IPA: [optional]
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libboost-dev
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Support for Raspberry Pi can be disabled through the meson
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'pipelines' option to avoid this dependency.
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for device hotplug enumeration: [optional]
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libudev-dev
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for documentation: [optional]
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python3-sphinx doxygen graphviz
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for gstreamer: [optional]
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libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
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for cam: [optional]
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libevent-dev
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for qcam: [optional]
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qtbase5-dev libqt5core5a libqt5gui5 libqt5widgets5 qttools5-dev-tools libtiff-dev
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for tracing with lttng: [optional]
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liblttng-ust-dev python3-jinja2 lttng-tools
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Using GStreamer plugin
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~~~~~~~~~~~~~~~~~~~~~~
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To use GStreamer plugin from source tree, set the following environment so that
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GStreamer can find it.
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export GST_PLUGIN_PATH=$(pwd)/build/src/gstreamer
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The debugging tool ``gst-launch-1.0`` can be used to construct a pipeline and
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test it. The following pipeline will stream from the camera named "Camera 1"
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onto the default video display element on your system.
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.. code::
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gst-launch-1.0 libcamerasrc camera-name="Camera 1" ! videoconvert ! autovideosink
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.. section-end-getting-started
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Troubleshooting
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~~~~~~~~~~~~~~~
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Several users have reported issues with meson installation, crux of the issue
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is a potential version mismatch between the version that root uses, and the
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version that the normal user uses. On calling `ninja -C build`, it can't find
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the build.ninja module. This is a snippet of the error message.
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::
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ninja: Entering directory `build'
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ninja: error: loading 'build.ninja': No such file or directory
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This can be solved in two ways:
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1) Don't install meson again if it is already installed system-wide.
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2) If a version of meson which is different from the system-wide version is
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already installed, uninstall that meson using pip3, and install again without
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the --user argument.
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