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Laurent Pinchart 442f516c62 libcamera: Print backtrace on fatal errors
When a fatal error occurs the program aborts, and all the logger
provides is the location of the line that caused the error. Extend this
with a full backtrace to help debugging.

The backtrace is generated using the backtrace() call, a GNU extension
to the C library. It is available in glibc and uClibc but not in musl.
Test for availability of the function to condition compilation of the
backtrace printing. Implementing backtrace support with musl is an
exercise left to the reader if desired.

The LogOutput class is extended to support writing string messages
directly to the output. Strings written directly will be considered as
LogDebug messages when written to the Syslog.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-11-26 18:47:15 +02:00
Documentation ipa: Switch to the plain C API 2019-11-20 21:48:00 +02:00
include ipa: Allow short-circuiting the ipa_context_ops 2019-11-20 21:48:05 +02:00
licenses licenses: add Apache-2.0 license 2019-08-12 10:34:13 +02:00
package/gentoo/media-libs/libcamera libcamera: controls: Auto-generate control_ids.h and control_ids.cpp 2019-10-05 20:02:51 +03:00
src libcamera: Print backtrace on fatal errors 2019-11-26 18:47:15 +02:00
test test: controls: control_list: Add status check 2019-11-25 09:54:41 +01:00
utils utils: checkstyle.py: Add include checker 2019-10-23 17:12:34 +03:00
.clang-format clang-format: Don't indent namespaces 2019-09-23 09:50:08 +03:00
.gitignore git: Add .gitignore file 2018-12-14 13:23:07 +00:00
meson.build libcamera: Print backtrace on fatal errors 2019-11-26 18:47:15 +02:00
meson_options.txt meson: Rename 'tests' option to 'test' 2019-08-22 19:35:54 +03:00
README.rst README: Simplify a bit the build instructions 2019-11-18 02:28:55 +02:00

.. 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 ninja-build python3-yaml

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

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

for documentation: [optional]
	python3-sphinx doxygen

.. section-end-getting-started