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feat: encode AV1 with VA-API on Linux - #377
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Adds an AV1 encoder for GPUs whose VA-API driver encodes AV1 profile 0, such as AMD's, writing the sequence and frame headers as packed headers the way FFmpeg does. Frames are kept to multiples of 8, since AMD's driver pads the width to that.
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Brings in the work upstream added from October 11 to 15: hardware video codecs on every platform, through Media Foundation, VideoToolbox, VA-API and NVDEC, with WebRTC built with H.265 (devopvoid#346 to devopvoid#348, devopvoid#352, devopvoid#353, devopvoid#356, devopvoid#359, devopvoid#371 to devopvoid#377); HEVC and AV1 decoding in the media player, with dav1d and Vulkan Video (devopvoid#331, devopvoid#345); encoded frame injectors (devopvoid#365); receiver source changes and audio packet infos (devopvoid#366); audio codec factories (devopvoid#340); network thread observers called on a callback thread (devopvoid#364); screen capture with ScreenCaptureKit (devopvoid#354); Windows audio devices that mix more than two channels (devopvoid#358); autoninja (devopvoid#357); and the release channels of the docs site (devopvoid#361). Fork-side adaptations: - The factory keeps the CreatePeerConnectionFactory overload without a worker thread, and still switches device capture on the network thread. devopvoid#355 copies WebRTC's factory setup and has the audio module learn a worker thread, which only matters for a worker thread distinct from the network thread, and WebRTC is removing those. The audio codec factories and hardware codec switches of devopvoid#340 and devopvoid#359 go to that overload. - WebRTC stays on a commit on main, so the move to branch 8059 (devopvoid#360) and its fixed clang package are left out. - The data channels variant builds WebRTC without H.265 and without the extra targets, leaves out the audio codec factory bindings and addTransceiverOfType, and skips the new tests that need audio or video. - dav1d is built against the sysroot on native Linux builds as well, as FFmpeg is. CI installs Meson for the full variant only, checks out the dav1d submodule, and adds its commit to the FFmpeg cache key. The fork's Windows SDK step stays, without upstream's second one. - The release workflow records the docs' version in the tagged commit, as upstream's now does. The docs site still builds from main, since this fork publishes none. - The Maven files stay deleted: Jetty is bumped in the version catalog, and the docs lockfile takes upstream's bumps on top of the fork's newer VitePress. - The media module's README builds with Gradle.
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Adds an AV1 profile 0 encoder for GPUs whose VA-API driver encodes AV1, such as AMD RDNA3 and newer. It writes the sequence and frame headers as packed headers, as FFmpeg does, and leaves the quantizer, loop filter and CDEF to the driver. Frames are kept to multiples of 8, since AMD pads the width to that; SVC and sizes below AMD's minimum of 320x128 go to libaom.