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diff --git a/Documentation/DocBook/v4l/media-controller.xml b/Documentation/DocBook/v4l/media-controller.xml deleted file mode 100644 index 873ac3a..0000000 --- a/Documentation/DocBook/v4l/media-controller.xml +++ /dev/null @@ -1,89 +0,0 @@ -<partinfo> - <authorgroup> - <author> - <firstname>Laurent</firstname> - <surname>Pinchart</surname> - <affiliation><address><email>laurent.pinchart@ideasonboard.com</email></address></affiliation> - <contrib>Initial version.</contrib> - </author> - </authorgroup> - <copyright> - <year>2010</year> - <holder>Laurent Pinchart</holder> - </copyright> - - <revhistory> - <!-- Put document revisions here, newest first. --> - <revision> - <revnumber>1.0.0</revnumber> - <date>2010-11-10</date> - <authorinitials>lp</authorinitials> - <revremark>Initial revision</revremark> - </revision> - </revhistory> -</partinfo> - -<title>Media Controller API</title> - -<chapter id="media_controller"> - <title>Media Controller</title> - - <section id="media-controller-intro"> - <title>Introduction</title> - <para>Media devices increasingly handle multiple related functions. Many USB - cameras include microphones, video capture hardware can also output video, - or SoC camera interfaces also perform memory-to-memory operations similar to - video codecs.</para> - <para>Independent functions, even when implemented in the same hardware, can - be modelled as separate devices. A USB camera with a microphone will be - presented to userspace applications as V4L2 and ALSA capture devices. The - devices' relationships (when using a webcam, end-users shouldn't have to - manually select the associated USB microphone), while not made available - directly to applications by the drivers, can usually be retrieved from - sysfs.</para> - <para>With more and more advanced SoC devices being introduced, the current - approach will not scale. Device topologies are getting increasingly complex - and can't always be represented by a tree structure. Hardware blocks are - shared between different functions, creating dependencies between seemingly - unrelated devices.</para> - <para>Kernel abstraction APIs such as V4L2 and ALSA provide means for - applications to access hardware parameters. As newer hardware expose an - increasingly high number of those parameters, drivers need to guess what - applications really require based on limited information, thereby - implementing policies that belong to userspace.</para> - <para>The media controller API aims at solving those problems.</para> - </section> - - <section id="media-controller-model"> - <title>Media device model</title> - <para>Discovering a device internal topology, and configuring it at runtime, - is one of the goals of the media controller API. To achieve this, hardware - devices are modelled as an oriented graph of building blocks called entities - connected through pads.</para> - <para>An entity is a basic media hardware or software building block. It can - correspond to a large variety of logical blocks such as physical hardware - devices (CMOS sensor for instance), logical hardware devices (a building - block in a System-on-Chip image processing pipeline), DMA channels or - physical connectors.</para> - <para>A pad is a connection endpoint through which an entity can interact - with other entities. Data (not restricted to video) produced by an entity - flows from the entity's output to one or more entity inputs. Pads should not - be confused with physical pins at chip boundaries.</para> - <para>A link is a point-to-point oriented connection between two pads, - either on the same entity or on different entities. Data flows from a source - pad to a sink pad.</para> - </section> -</chapter> - -<appendix id="media-user-func"> - <title>Function Reference</title> - <!-- Keep this alphabetically sorted. --> - &sub-media-func-open; - &sub-media-func-close; - &sub-media-func-ioctl; - <!-- All ioctls go here. --> - &sub-media-ioc-device-info; - &sub-media-ioc-enum-entities; - &sub-media-ioc-enum-links; - &sub-media-ioc-setup-link; -</appendix> |