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authorTomi Valkeinen <tomi.valkeinen@ideasonboard.com>2022-06-08 10:24:17 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-06-08 20:16:21 +0300
commitd6cfb080604a69454837fc95a041c69a1759c1cb (patch)
treece8bbc41a4c166fcd260486e28d2d854285c8f37 /src/qcam/assets/feathericons/file-plus.svg
parentab21acb9c0efa4bef944c17ef3ac3ed8550a81d1 (diff)
py: examples: Add simple-continuous-capture.py
Add a slightly more complex, and I think a more realistic, example, where the script reacts to events and re-queues the buffers. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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.. SPDX-License-Identifier: CC-BY-SA-4.0

.. contents::
   :local:

*************
Documentation
*************

.. toctree::
   :hidden:

   API <api-html/index>

API
===

The libcamera API is extensively documented using Doxygen. The :ref:`API
nightly build <api>` contains the most up-to-date API documentation, built from
the latest master branch.

Feature Requirements
====================

Device enumeration
------------------

The library shall support enumerating all camera devices available in the
system, including both fixed cameras and hotpluggable cameras. It shall
support cameras plugged and unplugged after the initialization of the
library, and shall offer a mechanism to notify applications of camera plug
and unplug.

The following types of cameras shall be supported:

* Internal cameras designed for point-and-shoot still image and video
  capture usage, either controlled directly by the CPU, or exposed through
  an internal USB bus as a UVC device.

* External UVC cameras designed for video conferencing usage.

Other types of camera, including analog cameras, depth cameras, thermal
cameras, external digital picture or movie cameras, are out of scope for
this project.

A hardware device that includes independent camera sensors, such as front
and back sensors in a phone, shall be considered as multiple camera devices
for the purpose of this library.

Independent Camera Devices
--------------------------

When multiple cameras are present in the system and are able to operate
independently from each other, the library shall expose them as multiple
camera devices and support parallel operation without any additional usage
restriction apart from the limitations inherent to the hardware (such as
memory bandwidth, CPU usage or number of CSI-2 receivers for instance).

Independent processes shall be able to use independent cameras devices
without interfering with each other. A single camera device shall be
usable by a single process at a time.

Multiple streams support
------------------------

The library shall support multiple video streams running in parallel
for each camera device, within the limits imposed by the system.

Per frame controls
------------------

The library shall support controlling capture parameters for each stream
on a per-frame basis, on a best effort basis based on the capabilities of the
hardware and underlying software stack (including kernel drivers and
firmware). It shall apply capture parameters to the frame they target, and
report the value of the parameters that have effectively been used for each
captured frame.

When a camera device supports multiple streams, the library shall allow both
control of each stream independently, and control of multiple streams
together. Streams that are controlled together shall be synchronized. No
synchronization is required for streams controlled independently.

Capability Enumeration
----------------------