This library aims to be a friendly, portable C implementation of the AV1 Image File Format, as described here:
https://aomediacodec.github.io/av1-avif/
It is a work-in-progress, but can already encode and decode all AOM supported YUV formats and bit depths (with alpha).
For now, it is recommended that you checkout/use tagged releases instead of just using the master branch. I will regularly create new versions as bugfixes and features are added.
Please see the examples in the examples directory. If you're already building libavif, enable the CMake option AVIF_BUILD_EXAMPLES in order to build and run the examples too.
Building libavif requires CMake.
No AV1 codecs are enabled by default. Enable them by enabling any of the following CMake options:
AVIF_CODEC_AOM- requires CMake, NASMAVIF_CODEC_DAV1D- requires Meson, Ninja, NASMAVIF_CODEC_LIBGAV1- requires CMake, NinjaAVIF_CODEC_RAV1E- requires cargo (Rust), NASM
These libraries (in their C API form) must be externally available
(discoverable via CMake's FIND_LIBRARY) to use them, or if libavif is
a child CMake project, the appropriate CMake target must already exist
by the time libavif's CMake scripts are executed.
The ext/ subdirectory contains a handful of basic scripts which each pull
down a known-good copy of an AV1 codec and make a local static library build.
If you want to statically link any codec into your local (static) build of
libavif, building using one of these scripts and then enabling the associated
AVIF_LOCAL_* is a convenient method, but you must make sure to disable
BUILD_SHARED_LIBS in CMake to instruct it to make a static libavif library.
If you want to build/install shared libraries for AV1 codecs, you can still peek inside of each script to see where the current known-good SHA is for each codec.
If you're building on Windows with Visual Studio 2019 and want to try out libavif without going through the build process, static library builds for both Debug and Release are available on AppVeyor.
Released under the BSD License.
Copyright 2019 Joe Drago. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
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