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V4L2 libVA Backend

This libVA backend is designed to work with the Video for Linux Memory-To-Memory API that is used by a number of video codecs drivers, in particular SoCs found on SBCs. After an initial implementation by Bootlin, development on this backend ceased before the Stateless V4L2-M2M API it uses became stable. Development has since been picked up again, see [#Status] for details.

Building

The project is built using meson:

meson setup build
meson compile -Cbuild

Usage

Applications using the backend can be launched by adding the build directory to the libVA driver path, and, optionally, setting the driver name to load:

LIBVA_DRIVERS_PATH=<project dir>/build/src LIBVA_DRIVER_NAME=v4l2 vainfo

Alternatively, the library can be installed to the default driver path:

meson install -Cbuild

The driver probes the system for appropriate V4L2 devices, advertising all of their capabilities. This can be overriden by explicitly specifying a device pair to use:

export LIBVA_V4L2_VIDEO_PATH=/dev/videoX LIBVA_V4L2_MEDIA_PATH=/dev/mediaY

Note that some applications need further configuration to load the library. In particular, gstreamer based applications have a whitelist for supported drivers, that can be disabled manually (GST_VAAPI_ALL_DRIVERS=1).

Status

The project currently supports these codecs: MPEG2, H264, VP8, (and VP9). VP9 support depends on a part of gstreamer that is not likely to be present in the version shipped by your distribution. The implementation has been tested using Intel's vaapi-fits on an RK3399, which is supported by the hantro and rockchip drivers. Feedback on results for other platforms are very welcome, do not expect the library to simply work smoothly though. Future development on this project aims to improve stability, add supported codecs, and support the stateful V4L2-M2M API.

About

No description, website, or topics provided.

Resources

Readme
Activity

Stars

22 stars

Watchers

3 watching

Forks

1 fork
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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V4L2 libVA Backend
This libVA backend is designed to work with the Video for Linux Memory-To-Memory API that is used by a number of video codecs drivers, in particular SoCs found on SBCs.
After an initial implementation by Bootlin, development on this backend ceased before the Stateless V4L2-M2M API it uses became stable.
Development has since been picked up again, see [#Status] for details.
Building
The project is built using meson:
meson setup build
meson compile -Cbuild

Usage
Applications using the backend can be launched by adding the build directory to the libVA driver path, and, optionally, setting the driver name to load:
LIBVA_DRIVERS_PATH=<project dir>/build/src LIBVA_DRIVER_NAME=v4l2 vainfo

Alternatively, the library can be installed to the default driver path:
meson install -Cbuild

The driver probes the system for appropriate V4L2 devices, advertising all of their capabilities.
This can be overriden by explicitly specifying a device pair to use:
export LIBVA_V4L2_VIDEO_PATH=/dev/videoX LIBVA_V4L2_MEDIA_PATH=/dev/mediaY

Note that some applications need further configuration to load the library.
In particular, gstreamer based applications have a whitelist for supported drivers, that can be disabled manually (GST_VAAPI_ALL_DRIVERS=1).
Status
The project currently supports these codecs: MPEG2, H264, VP8, (and VP9).
VP9 support depends on a part of gstreamer that is not likely to be present in the version shipped by your distribution.
The implementation has been tested using Intel's vaapi-fits on an RK3399, which is supported by the hantro and rockchip drivers.
Feedback on results for other platforms are very welcome, do not expect the library to simply work smoothly though.
Future development on this project aims to improve stability, add supported codecs, and support the stateful V4L2-M2M API.
About
No description, website, or topics provided.
Resources
Readme
Activity
Stars
22 stars
Watchers
3 watching
Forks
1 fork
Report repository
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Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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V4L2 libVA Backend
This libVA backend is designed to work with the Video for Linux Memory-To-Memory API that is used by a number of video codecs drivers, in particular SoCs found on SBCs.
After an initial implementation by Bootlin, development on this backend ceased before the Stateless V4L2-M2M API it uses became stable.
Development has since been picked up again, see [#Status] for details.
Building
The project is built using meson:
meson setup build
meson compile -Cbuild

Usage
Applications using the backend can be launched by adding the build directory to the libVA driver path, and, optionally, setting the driver name to load:
LIBVA_DRIVERS_PATH=<project dir>/build/src LIBVA_DRIVER_NAME=v4l2 vainfo

Alternatively, the library can be installed to the default driver path:
meson install -Cbuild

The driver probes the system for appropriate V4L2 devices, advertising all of their capabilities.
This can be overriden by explicitly specifying a device pair to use:
export LIBVA_V4L2_VIDEO_PATH=/dev/videoX LIBVA_V4L2_MEDIA_PATH=/dev/mediaY

Note that some applications need further configuration to load the library.
In particular, gstreamer based applications have a whitelist for supported drivers, that can be disabled manually (GST_VAAPI_ALL_DRIVERS=1).
Status
The project currently supports these codecs: MPEG2, H264, VP8, (and VP9).
VP9 support depends on a part of gstreamer that is not likely to be present in the version shipped by your distribution.
The implementation has been tested using Intel's vaapi-fits on an RK3399, which is supported by the hantro and rockchip drivers.
Feedback on results for other platforms are very welcome, do not expect the library to simply work smoothly though.
Future development on this project aims to improve stability, add supported codecs, and support the stateful V4L2-M2M API.
About
No description, website, or topics provided.
Resources
Readme
Activity
Stars
22 stars
Watchers
3 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
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V4L2 libVA Backend
This libVA backend is designed to work with the Video for Linux Memory-To-Memory API that is used by a number of video codecs drivers, in particular SoCs found on SBCs.
After an initial implementation by Bootlin, development on this backend ceased before the Stateless V4L2-M2M API it uses became stable.
Development has since been picked up again, see [#Status] for details.
Building
The project is built using meson:
meson setup build
meson compile -Cbuild

Usage
Applications using the backend can be launched by adding the build directory to the libVA driver path, and, optionally, setting the driver name to load:
LIBVA_DRIVERS_PATH=<project dir>/build/src LIBVA_DRIVER_NAME=v4l2 vainfo

Alternatively, the library can be installed to the default driver path:
meson install -Cbuild

The driver probes the system for appropriate V4L2 devices, advertising all of their capabilities.
This can be overriden by explicitly specifying a device pair to use:
export LIBVA_V4L2_VIDEO_PATH=/dev/videoX LIBVA_V4L2_MEDIA_PATH=/dev/mediaY

Note that some applications need further configuration to load the library.
In particular, gstreamer based applications have a whitelist for supported drivers, that can be disabled manually (GST_VAAPI_ALL_DRIVERS=1).
Status
The project currently supports these codecs: MPEG2, H264, VP8, (and VP9).
VP9 support depends on a part of gstreamer that is not likely to be present in the version shipped by your distribution.
The implementation has been tested using Intel's vaapi-fits on an RK3399, which is supported by the hantro and rockchip drivers.
Feedback on results for other platforms are very welcome, do not expect the library to simply work smoothly though.
Future development on this project aims to improve stability, add supported codecs, and support the stateful V4L2-M2M API.
About
No description, website, or topics provided.
Resources
Readme
Activity
Stars
22 stars
Watchers
3 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
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V4L2 libVA Backend
This libVA backend is designed to work with the Video for Linux Memory-To-Memory API that is used by a number of video codecs drivers, in particular SoCs found on SBCs.
After an initial implementation by Bootlin, development on this backend ceased before the Stateless V4L2-M2M API it uses became stable.
Development has since been picked up again, see [#Status] for details.
Building
The project is built using meson:
meson setup build
meson compile -Cbuild

Usage
Applications using the backend can be launched by adding the build directory to the libVA driver path, and, optionally, setting the driver name to load:
LIBVA_DRIVERS_PATH=<project dir>/build/src LIBVA_DRIVER_NAME=v4l2 vainfo

Alternatively, the library can be installed to the default driver path:
meson install -Cbuild

The driver probes the system for appropriate V4L2 devices, advertising all of their capabilities.
This can be overriden by explicitly specifying a device pair to use:
export LIBVA_V4L2_VIDEO_PATH=/dev/videoX LIBVA_V4L2_MEDIA_PATH=/dev/mediaY

Note that some applications need further configuration to load the library.
In particular, gstreamer based applications have a whitelist for supported drivers, that can be disabled manually (GST_VAAPI_ALL_DRIVERS=1).
Status
The project currently supports these codecs: MPEG2, H264, VP8, (and VP9).
VP9 support depends on a part of gstreamer that is not likely to be present in the version shipped by your distribution.
The implementation has been tested using Intel's vaapi-fits on an RK3399, which is supported by the hantro and rockchip drivers.
Feedback on results for other platforms are very welcome, do not expect the library to simply work smoothly though.
Future development on this project aims to improve stability, add supported codecs, and support the stateful V4L2-M2M API.
About
No description, website, or topics provided.
Resources
Readme
Activity
Stars
22 stars
Watchers
3 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
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V4L2 libVA Backend
This libVA backend is designed to work with the Video for Linux Memory-To-Memory API that is used by a number of video codecs drivers, in particular SoCs found on SBCs.
After an initial implementation by Bootlin, development on this backend ceased before the Stateless V4L2-M2M API it uses became stable.
Development has since been picked up again, see [#Status] for details.
Building
The project is built using meson:
meson setup build
meson compile -Cbuild

Usage
Applications using the backend can be launched by adding the build directory to the libVA driver path, and, optionally, setting the driver name to load:
LIBVA_DRIVERS_PATH=<project dir>/build/src LIBVA_DRIVER_NAME=v4l2 vainfo

Alternatively, the library can be installed to the default driver path:
meson install -Cbuild

The driver probes the system for appropriate V4L2 devices, advertising all of their capabilities.
This can be overriden by explicitly specifying a device pair to use:
export LIBVA_V4L2_VIDEO_PATH=/dev/videoX LIBVA_V4L2_MEDIA_PATH=/dev/mediaY

Note that some applications need further configuration to load the library.
In particular, gstreamer based applications have a whitelist for supported drivers, that can be disabled manually (GST_VAAPI_ALL_DRIVERS=1).
Status
The project currently supports these codecs: MPEG2, H264, VP8, (and VP9).
VP9 support depends on a part of gstreamer that is not likely to be present in the version shipped by your distribution.
The implementation has been tested using Intel's vaapi-fits on an RK3399, which is supported by the hantro and rockchip drivers.
Feedback on results for other platforms are very welcome, do not expect the library to simply work smoothly though.
Future development on this project aims to improve stability, add supported codecs, and support the stateful V4L2-M2M API.
About
No description, website, or topics provided.
Resources
Readme
Activity
Stars
22 stars
Watchers
3 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
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V4L2 libVA Backend
This libVA backend is designed to work with the Video for Linux Memory-To-Memory API that is used by a number of video codecs drivers, in particular SoCs found on SBCs.
After an initial implementation by Bootlin, development on this backend ceased before the Stateless V4L2-M2M API it uses became stable.
Development has since been picked up again, see [#Status] for details.
Building
The project is built using meson:
meson setup build
meson compile -Cbuild

Usage
Applications using the backend can be launched by adding the build directory to the libVA driver path, and, optionally, setting the driver name to load:
LIBVA_DRIVERS_PATH=<project dir>/build/src LIBVA_DRIVER_NAME=v4l2 vainfo

Alternatively, the library can be installed to the default driver path:
meson install -Cbuild

The driver probes the system for appropriate V4L2 devices, advertising all of their capabilities.
This can be overriden by explicitly specifying a device pair to use:
export LIBVA_V4L2_VIDEO_PATH=/dev/videoX LIBVA_V4L2_MEDIA_PATH=/dev/mediaY

Note that some applications need further configuration to load the library.
In particular, gstreamer based applications have a whitelist for supported drivers, that can be disabled manually (GST_VAAPI_ALL_DRIVERS=1).
Status
The project currently supports these codecs: MPEG2, H264, VP8, (and VP9).
VP9 support depends on a part of gstreamer that is not likely to be present in the version shipped by your distribution.
The implementation has been tested using Intel's vaapi-fits on an RK3399, which is supported by the hantro and rockchip drivers.
Feedback on results for other platforms are very welcome, do not expect the library to simply work smoothly though.
Future development on this project aims to improve stability, add supported codecs, and support the stateful V4L2-M2M API.
About
No description, website, or topics provided.
Resources
Readme
Activity
Stars
22 stars
Watchers
3 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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V4L2 libVA Backend
This libVA backend is designed to work with the Video for Linux Memory-To-Memory API that is used by a number of video codecs drivers, in particular SoCs found on SBCs.
After an initial implementation by Bootlin, development on this backend ceased before the Stateless V4L2-M2M API it uses became stable.
Development has since been picked up again, see [#Status] for details.
Building
The project is built using meson:
meson setup build
meson compile -Cbuild

Usage
Applications using the backend can be launched by adding the build directory to the libVA driver path, and, optionally, setting the driver name to load:
LIBVA_DRIVERS_PATH=<project dir>/build/src LIBVA_DRIVER_NAME=v4l2 vainfo

Alternatively, the library can be installed to the default driver path:
meson install -Cbuild

The driver probes the system for appropriate V4L2 devices, advertising all of their capabilities.
This can be overriden by explicitly specifying a device pair to use:
export LIBVA_V4L2_VIDEO_PATH=/dev/videoX LIBVA_V4L2_MEDIA_PATH=/dev/mediaY

Note that some applications need further configuration to load the library.
In particular, gstreamer based applications have a whitelist for supported drivers, that can be disabled manually (GST_VAAPI_ALL_DRIVERS=1).
Status
The project currently supports these codecs: MPEG2, H264, VP8, (and VP9).
VP9 support depends on a part of gstreamer that is not likely to be present in the version shipped by your distribution.
The implementation has been tested using Intel's vaapi-fits on an RK3399, which is supported by the hantro and rockchip drivers.
Feedback on results for other platforms are very welcome, do not expect the library to simply work smoothly though.
Future development on this project aims to improve stability, add supported codecs, and support the stateful V4L2-M2M API.
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