commit | 430967a6277a08d00e0128556f9ca6af28442186 | [log] [tgz] |
---|---|---|
author | Victorien Le Couviour--Tuffet <victorien@videolan.org> | Tue Oct 29 16:19:11 2019 +0100 |
committer | Ronald S. Bultje <rsbultje@gmail.com> | Thu Jan 09 14:56:42 2020 +0100 |
tree | 5b897aed7dff5d70110c89f480baa95f0e6b822a | |
parent | a47212259e2c6ca44b2ec502099ff33247684b52 [diff] |
checkasm: x86: ensure all SIMD lanes are turned on at all times YMM and ZMM registers on x86 are turned off to save power when they haven't been used for some period of time. When they are used there will be a "warmup" period during which performance will be reduced and inconsistent which is problematic when trying to benchmark individual functions. Periodically issue "dummy" instructions that uses those registers to prevent them from being powered down. The end result is more consistent benchmark results. Credits to Henrik Gramner's commit 1878c7f2af0a9c73e291488209109782c428cfcf from x264.
dav1d is a new AV1 cross-platform decoder, open-source, and focused on speed and correctness.
The canonical repository URL for this repo is https://code.videolan.org/videolan/dav1d
This project is partially funded by the Alliance for Open Media/AOM.
The goal of this project is to provide a decoder for most platforms, and achieve the highest speed possible to overcome the temporary lack of AV1 hardware decoder.
It supports all features from AV1, including all subsampling and bit-depth parameters.
In the future, this project will host simple tools or simple wrappings (like, for example, an MFT transform).
dav1d is released under a very liberal license, a contrario from the other VideoLAN projects, so that it can be embedded anywhere, including non-open-source software; or even drivers, to allow the creation of hybrid decoders.
The reasoning behind this decision is the same as for libvorbis, see RMS on vorbis.
The plan is the folllowing:
Currently, we are looking for help from:
Our contributions guidelines are quite strict. We want to build a coherent codebase to simplify maintenance and achieve the highest possible speed.
Notably, the codebase is in pure C and asm.
We are on IRC, on the #dav1d channel on Freenode.
See the contributions document.
There is no CLA.
People will keep their copyright and their authorship rights, while adhering to the BSD 2-clause license.
VideoLAN will only have the collective work rights.
The VideoLAN Code of Conduct applies to this project.
mkdir build && cd build
to create a build directory and enter itmeson ..
to configure meson, add --default-library=static
if static linking is desiredninja
to compilegit clone https://code.videolan.org/videolan/dav1d-test-data.git tests/dav1d-test-data
to fetch the test data repository-Dtestdata_tests=true
meson test -v
after compilingThis project is partially funded by the Alliance for Open Media/AOM and is supported by TwoOrioles and VideoLabs.
These companies can provide support and integration help, should you need it.
Please read the AV1 patent license that applies to the AV1 specification and codec.