commit | bf920fba5782a8b272b44792df0942c211ec5886 | [log] [tgz] |
---|---|---|
author | Martin Storsjö <martin@martin.st> | Sun May 19 18:10:55 2019 |
committer | Martin Storsjö <martin@martin.st> | Sun May 19 18:31:53 2019 |
tree | 4bcd3267e934a6ab4b6b48529e038d80e51787c1 | |
parent | f64fdae55128ff1c2204f578ee26b6d577862b26 [diff] |
arm: mc: Fix 8tap_v w8 with OBMC 3/4 heights Also make sure that the w4 case can exit after processing 12 pixels, where it is convenient. This gives a small slowdown for in-order cores like A7, A8, A53, but acutally seems to give a small speedup for out-of-order cores like A9, A72 and A73. AArch64: Before: Cortex A53 A72 A73 mc_8tap_regular_w8_v_8bpc_neon: 223.8 247.3 228.5 After: mc_8tap_regular_w8_v_8bpc_neon: 232.5 243.9 223.4 AArch32: Before: Cortex A7 A8 A9 A53 A72 A73 mc_8tap_regular_w8_v_8bpc_neon: 550.2 470.7 520.5 257.0 256.4 248.2 After: mc_8tap_regular_w8_v_8bpc_neon: 554.3 474.2 511.6 267.5 252.6 246.8
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.
meson build --buildtype release
ninja -C build
meson configure
specify -Dbuild_tests=true
meson test
optionally with -v
for more verbose output, especially useful for checkasmCheckout the test data repository
git clone https://code.videolan.org/videolan/dav1d-test-data.git tests/dav1d-test-data
During initial build dir setup or meson configure
specify -Dbuild_tests=true
and -Dtestdata_tests=true
meson .test -Dbuild_tests=true -Dtestdata_tests=true
In the build directory run meson test
optionally with -v
for more verbose output
This 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.