Video Acceleration API: Difference between revisions

Revision as of 15:05, 11 October 2021

Revision as of 01:19, 18 November 2021

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{{jargon|date=November 2021}}

{{short description|Open source API by Intel}}

{{Infobox software

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'''Video Acceleration API''' ('''VA-API''') is an [[open source]] [[Applicationapplication programming interface|API]] that allows applications such as [[VLC media player]] or [[GStreamer]] to use hardware video acceleration capabilities, usually provided by the [[graphics processing unit]] (GPU). It is implemented by the [[free and open-source]] [[Library (computing)|library]] <tt>{{mono|libva</tt>}}, combined with a hardware-specific driver, usually provided together with the GPU driver.

VA-API video decode/encode interface is platform and window system independent but is primarily targeted at [[Direct Rendering Infrastructure]] (DRI) in [[X Window System]] on [[Unix]]-like [[operating system]]s (including [[Linux]], [[FreeBSD]], [[Solaris (operating system)|Solaris]]), and [[Android (operating system)|Android]], however it can potentially also be used with direct [[framebuffer]] and graphics sub-systems for video output. Accelerated processing includes support for [[Video codec|video decoding]], [[video coding|video encoding]], subpicture blending, and rendering.<ref name="ReferenceA">{{cite web|url=https://www.phoronix.com/scan.php?page=news_item&px=MTA0NDI|title=VA-API Video Acceleration On Intel Medfield - Phoronix|website=Phoronix.com|access-date=23 February 2019}}</ref>

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== Processes that can be accelerated with VA-API ==

Video decoding and post-processing processes that can be offloaded and accelerated if both the device drivers and GPU hardware supports them:

* [[Motion compensation]] (mocomp)

* [[Inverse discrete cosine transform]] (iDCT)

* In-loop [[deblocking filter (video)|deblocking filter]]

* Intra-frame prediction

* [[Huffman coding|variable-length decoding]] (VLD), more commonly known as slice-level acceleration

* Bitstream processing ([[Context-adaptive variable-length coding|CAVLC]]/[[Context-adaptive binary arithmetic coding|CABAC]])

== Software architecture ==

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* [https://fluendo.com/en/ Fluendo]<ref>{{cite web|url=https://www.phoronix.com/scan.php?page=news_item&px=ODEwMw|title=Fluendo's New Codecs Support VDPAU, VA-API - Phoronix|website=Phoronix.com|access-date=23 February 2019}}</ref>

* [[Gnash (software)|Gnash]] Flash / [[SWF]] player<ref>{{cite web|url=https://www.phoronix.com/scan.php?page=news_item&px=NzU1MA|title=H.264 VA-API GPU Video Acceleration For Flash - Phoronix|website=Phoronix.com|access-date=23 February 2019}}</ref>

* [[GStreamer]] through <tt>{{mono|gstreamer-vaapi</tt>}}<ref>{{cite web|url=https://cgit.freedesktop.org/gstreamer/gstreamer-vaapi|title=Hardware-accelerated video decoding, encoding and processing on Intel graphics through VA-API|website=Cgit.freedesktop.org|access-date=23 February 2019}}</ref>

<!--As of May 12th, 2011, ffmpeg does not support VA-API (libavcodec contains code that allows other applications to use VA-API). Before changing the following sentence, please discuss on the Discussion page! -->

* [[Kodi (software)|Kodi]] (formerly XBMC Media Center) ([[Linux]])<ref name="phoronix.com">{{cite web|url=https://www.phoronix.com/scan.php?page=news_item&px=ODEyNw|title=XBMC Gets Working Intel VA-API Support - Phoronix|website=Phoronix.com|access-date=23 February 2019}}</ref>