https://wiki.multimedia.cx/index.php?action=history&feed=atom&title=Video_Acceleration_API 2026-04-29T08:30:19Z Revision history for this page on the wiki MediaWiki 1.39.5 https://wiki.multimedia.cx/index.php?title=Video_Acceleration_API&diff=9455&oldid=prev 2008-02-19T10:03:28Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 03:03, 19 February 2008</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Video Acceleration API (VA API)''' is a software API specification which provides access to [http://en.wikipedia.org/wiki/Graphics_processing_unit GPU] video-hardware acceleration for video processing. Accelerated processing includes video decoding, subpicture blending and rendering.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Video Acceleration API (VA API)''' is a software API specification which provides access to [http://en.wikipedia.org/wiki/Graphics_processing_unit GPU] video-hardware acceleration for video processing. Accelerated processing includes video decoding, subpicture blending and rendering.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>VA API is meant to some day replace [[XvMC]], [[XvMC]] which is the UNIX equivalent of the [[DirectX Video Acceleration|Microsoft Windows DirectX Video Acceleration (DxVA) API]]. The main motivation for VA API is to enable hardware accelerated video decode at various entry-points ([[<del style="font-weight: bold; text-decoration: none;">Variable-length code|VLD</del>]], [[<del style="font-weight: bold; text-decoration: none;">IDCT</del>]], [[<del style="font-weight: bold; text-decoration: none;">Motion Compensation</del>]], etc.) for the prevailing coding standards today ([[MPEG-2]], [[MPEG-4 ASP]]/[[H.263]], [[MPEG-4 AVC]]/[[H.264]], and [[VC-1]]/[[VC-1|VMW3]]). Extending [[XvMC]] was considered, but due to its original design for MPEG-2 [[Motion Compensation|MotionComp]] only, it made more sense to design an interface from scratch that can fully expose the video decode capabilities in today's GPUs.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>VA API is meant to some day replace [[XvMC]], [[XvMC]] which is the UNIX equivalent of the [[DirectX Video Acceleration|Microsoft Windows DirectX Video Acceleration (DxVA) API]]. The main motivation for VA API is to enable hardware accelerated video decode at various entry-points ([[<ins style="font-weight: bold; text-decoration: none;">iDCT</ins>]], [[<ins style="font-weight: bold; text-decoration: none;">Motion Compensation</ins>]], [[<ins style="font-weight: bold; text-decoration: none;">Variable Length Decoding|VLD</ins>]], etc.) for the prevailing coding standards today ([[MPEG-2]], [[MPEG-4 ASP]]/[[H.263]], [[MPEG-4 AVC]]/[[H.264]], and [[VC-1]]/[[VC-1|VMW3]]). Extending [[XvMC]] was considered, but due to its original design for MPEG-2 [[Motion Compensation|MotionComp]] only, it made more sense to design an interface from scratch that can fully expose the video decode capabilities in today's GPUs.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Processes that could be accelerated==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Processes that could be accelerated==</div></td></tr> </table>

Gamester17 https://wiki.multimedia.cx/index.php?title=Video_Acceleration_API&diff=9454&oldid=prev 2008-02-19T10:02:07Z

<p><span dir="auto"><span class="autocomment">Processes that could be accelerated</span></span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 03:02, 19 February 2008</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l4">Line 4:</td> <td colspan="2" class="diff-lineno">Line 4:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Processes that could be accelerated==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Processes that could be accelerated==</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* Motion compensation</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* <ins style="font-weight: bold; text-decoration: none;">[[Motion compensation|</ins>Motion compensation <ins style="font-weight: bold; text-decoration: none;">(mocomp)]]</ins></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [[Inverse discrete cosine transform<del style="font-weight: bold; text-decoration: none;">]] </del>(iDCT)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [[Inverse discrete cosine transform<ins style="font-weight: bold; text-decoration: none;">|Inverse discrete cosine transform </ins>(iDCT)<ins style="font-weight: bold; text-decoration: none;">]]</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>** [[Inverse telecine]] 3:2 and 2:2 pull-down correction</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>** [[Inverse telecine]] 3:2 and 2:2 pull-down correction</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* <del style="font-weight: bold; text-decoration: none;">Bitstream processing (</del>[[<del style="font-weight: bold; text-decoration: none;">CAVLC]]/[[CABAC</del>]])</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* <ins style="font-weight: bold; text-decoration: none;">Inverse </ins>[[<ins style="font-weight: bold; text-decoration: none;">modified discrete cosine transform</ins>]] <ins style="font-weight: bold; text-decoration: none;">(iMDCT</ins>)</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* In-loop [[deblocking]]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* In-loop [[deblocking <ins style="font-weight: bold; text-decoration: none;">filter (video)|deblocking filter</ins>]]</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* Intra-frame prediction</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Inverse [[Quantization (image processing)|quantization]] (IQ)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Inverse [[Quantization (image processing)|quantization]] (IQ)</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [[<del style="font-weight: bold; text-decoration: none;">Variable-length code</del>|Variable-Length Decoding (VLD)]], more commonly known as slice-level acceleration</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [[<ins style="font-weight: bold; text-decoration: none;">Huffman_coding</ins>|Variable-Length Decoding (VLD)]], more commonly known as slice-level acceleration</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Spatial-temporal [[deinterlacing]] and automatic [[interlace]]/[[progressive scan|progressive]] source detection</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Spatial-temporal [[deinterlacing]] and automatic [[interlace]]/[[progressive scan|progressive]] source detection</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* Bitstream processing ([[CAVLC]]/[[CABAC]])</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Architecture ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Architecture ==</div></td></tr> </table>

Gamester17 https://wiki.multimedia.cx/index.php?title=Video_Acceleration_API&diff=9315&oldid=prev 2008-01-07T11:25:29Z

<p><span dir="auto"><span class="autocomment">External links</span></span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 04:25, 7 January 2008</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l60">Line 60:</td> <td colspan="2" class="diff-lineno">Line 60:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Freedesktop.org]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Freedesktop.org]]</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Device drivers]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Device drivers]]</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:FFmpeg]]</ins></div></td></tr> </table>

Gamester17 https://wiki.multimedia.cx/index.php?title=Video_Acceleration_API&diff=9308&oldid=prev 2008-01-07T11:15:44Z

<p><span dir="auto"><span class="autocomment">External links</span></span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 04:15, 7 January 2008</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l57">Line 57:</td> <td colspan="2" class="diff-lineno">Line 57:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Application programming interfaces]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Application programming interfaces]]</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:Application layer protocols]]</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Freedesktop.org]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Freedesktop.org]]</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[Category:<del style="font-weight: bold; text-decoration: none;">Application layer protocols</del>]]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[Category:<ins style="font-weight: bold; text-decoration: none;">Device drivers</ins>]]</div></td></tr> </table>

Gamester17 https://wiki.multimedia.cx/index.php?title=Video_Acceleration_API&diff=9225&oldid=prev 2007-12-28T22:52:54Z

<p><span dir="auto"><span class="autocomment">See also</span></span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:52, 28 December 2007</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l45">Line 45:</td> <td colspan="2" class="diff-lineno">Line 45:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== See also ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== See also ==</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [[Video <del style="font-weight: bold; text-decoration: none;">Acceleration API</del>|Video <del style="font-weight: bold; text-decoration: none;">Acceleration API </del>(<del style="font-weight: bold; text-decoration: none;">VA API</del>)]]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [[<ins style="font-weight: bold; text-decoration: none;">X-</ins>Video <ins style="font-weight: bold; text-decoration: none;">Motion Compensation</ins>|<ins style="font-weight: bold; text-decoration: none;">X-</ins>Video <ins style="font-weight: bold; text-decoration: none;">Motion Compensation </ins>(<ins style="font-weight: bold; text-decoration: none;">XvMC</ins>)]]</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [[DirectX Video Acceleration|DirectX Video Acceleration (DxVA) API]] - Microsoft Windows equivalent to [[VA API]] and [[XvMC]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [[DirectX Video Acceleration|DirectX Video Acceleration (DxVA) API]] - Microsoft Windows equivalent to [[VA API]] and [[XvMC]]</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> </table>

Gamester17 https://wiki.multimedia.cx/index.php?title=Video_Acceleration_API&diff=9218&oldid=prev 2007-12-28T22:46:18Z

<p></p> <p><b>New page</b></p><div>'''Video Acceleration API (VA API)''' is a software API specification which provides access to [http://en.wikipedia.org/wiki/Graphics_processing_unit GPU] video-hardware acceleration for video processing. Accelerated processing includes video decoding, subpicture blending and rendering.<br /> <br /> VA API is meant to some day replace [[XvMC]], [[XvMC]] which is the UNIX equivalent of the [[DirectX Video Acceleration|Microsoft Windows DirectX Video Acceleration (DxVA) API]]. The main motivation for VA API is to enable hardware accelerated video decode at various entry-points ([[Variable-length code|VLD]], [[IDCT]], [[Motion Compensation]], etc.) for the prevailing coding standards today ([[MPEG-2]], [[MPEG-4 ASP]]/[[H.263]], [[MPEG-4 AVC]]/[[H.264]], and [[VC-1]]/[[VC-1|VMW3]]). Extending [[XvMC]] was considered, but due to its original design for MPEG-2 [[Motion Compensation|MotionComp]] only, it made more sense to design an interface from scratch that can fully expose the video decode capabilities in today's GPUs.<br /> <br /> ==Processes that could be accelerated==<br /> * Motion compensation<br /> * [[Inverse discrete cosine transform]] (iDCT)<br /> ** [[Inverse telecine]] 3:2 and 2:2 pull-down correction<br /> * Bitstream processing ([[CAVLC]]/[[CABAC]])<br /> * In-loop [[deblocking]]<br /> * Inverse [[Quantization (image processing)|quantization]] (IQ)<br /> * [[Variable-length code|Variable-Length Decoding (VLD)]], more commonly known as slice-level acceleration<br /> * Spatial-temporal [[deinterlacing]] and automatic [[interlace]]/[[progressive scan|progressive]] source detection<br /> <br /> == Architecture ==<br /> The current interface is focused on video decode only and is window system independent, so that potentially it can be used with graphics sub-systems other than the [[X Window System]]. In a nutshell it is basically a scheme to pass various types of data buffers from the application to the [[GPU]] for [[Video codec|decoding]] a [[Elementary stream|compressed bit-stream]]. Feedback on this [[API]] is greatly welcomed, as this is intended to be a community collaborative effort. <br /> <br /> [[Image:VAAPI.jpg]]<br /> <br /> == Sources ==<br /> &lt;!-- STEP 3: All articles must cite at least one PUBLISHED, SPECIFIC, --&gt;<br /> &lt;!-- THIRD-PARTY source for the information, such as a book or --&gt;<br /> &lt;!-- a page on a reputable website. Please provide a URL or --&gt;<br /> &lt;!-- link if you wish to use an internet source. WE MUST BE --&gt;<br /> &lt;!-- ABLE TO VERIFY YOUR SOURCE, so sources such as &quot;Google&quot; or --&gt;<br /> &lt;!-- &quot;personal knowledge&quot; will be rejected. --&gt;<br /> &lt;!-- IF YOU DO NOT INCLUDE AT LEAST ONE VALID SOURCE, YOUR --&gt;<br /> &lt;!-- ARTICLE WILL BE REJECTED. --&gt;<br /> &lt;!-- --&gt;<br /> &lt;!-- Please add your source(s) below this line. --&gt;<br /> <br /> <br /> &quot;This API is intended to provide an interface between a video decode application (client) and a hardware decode accelerator (server), to off-load video decode operations from the host to the hardware accelerator at various entry-points.&quot;<br /> http://www.freedesktop.org/wiki/Software/vaapi<br /> <br /> &quot;A new video acceleration API is being developed, in an effort lead by Intel. This new API supports more complete offload (VLD) as well as iDCT+MC, and can support acceleration of MPEG4, H.264, VC-1, as well as MPEG2.&quot;<br /> http://www.mythtv.org/wiki/index.php/XvMC<br /> <br /> &quot;Extending XvMC was considered, but due to its original design for MPEG-2 MoComp only, it made more sense to design an interface from scratch that can fully expose the video decode capabilities in today's GPUs.&quot;<br /> http://www.xboxmediacenter.com/wiki/index.php?title=Hardware_Accelerated_Video_Decoding<br /> <br /> The &quot;VA API&quot; and &quot;libVA&quot; can also be read about here:<br /> &quot;The end user impact is improved performance of H.264, VC-1, MPEG-2 and MPEG-4 video playback with media players that use the new API compared to playback using a pure software implementation.&quot;<br /> https://wiki.ubuntu.com/mobile-hw-decode<br /> <br /> == See also ==<br /> * [[Video Acceleration API|Video Acceleration API (VA API)]]<br /> * [[DirectX Video Acceleration|DirectX Video Acceleration (DxVA) API]] - Microsoft Windows equivalent to [[VA API]] and [[XvMC]]<br /> <br /> == References ==<br /> * http://en.wikipedia.org/wiki/Video_Acceleration_API<br /> <br /> == External links ==<br /> * http://www.freedesktop.org/wiki/Software/vaapi<br /> * http://wiki.ubuntu.com/mobile-hw-decode<br /> <br /> <br /> [[Category:Application programming interfaces]]<br /> [[Category:Freedesktop.org]]<br /> [[Category:Application layer protocols]]</div>

Gamester17