53704ac3f4
The CameraManager class is not supposed to be instantiated multiple times, which led to a singleton implementation. This requires a global instance of the CameraManager, which is destroyed when the global destructors are executed. Relying on global instances causes issues with cleanup, as the order in which the global destructors are run can't be controlled. In particular, the Android camera HAL implementation ends up destroying the CameraHalManager after the CameraManager, which leads to use-after-free problems. To solve this, remove the CameraManager::instance() method and make the CameraManager class instantiable directly. Multiple instances are still not allowed, and this is enforced by storing the instance pointer internally to be checked when an instance is created. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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libcamera
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**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.
Getting Started
---------------
To build and install:
::
meson build
cd build
ninja
ninja 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
for device hotplug enumeration: [optional]
pkg-config libudev-dev
for qcam: [optional]
qtbase5-dev libqt5core5a libqt5gui5 libqt5widgets5
for documentation: [optional]
python3-sphinx doxygen