commit | 2ffd68b0bcd5839a079c65b3d59985a0553f266f | [log] [tgz] |
---|---|---|
author | Vignesh Venkatasubramanian <vigneshv@google.com> | Mon Nov 14 11:17:41 2022 -0800 |
committer | Vignesh Venkatasubramanian <vigneshvg@users.noreply.github.com> | Mon Nov 14 13:26:07 2022 -0800 |
tree | abbb79190c126b417747db9d33237d6349d61de2 | |
parent | a5b5714605709eaabc0d9d27cb685d535a8b8f2b [diff] |
Re-order the boxes within "stbl" The ISO-BMFF spec has a "recommendation" for how the boxes within the "stbl" box should be ordered. Text from Section 6.2.3 of the spec: It is *recommended* that the boxes within the Sample Table Box be in the following order: Sample Description, Time to Sample, Sample to Chunk, Sample Size, Chunk Offset. Change the writer code to update the order of these boxes to match what is recommended in the spec. Old order: stco, stsc, stsz, stss, stts, stsd. New order: stsd, stts, stsc, stsz, stco, stss. This also matches the box ordering used by other tools like ffmpeg. Motivation behind this change: The MP4 reader in the Android platform fails if this ordering is not followed. While that is not the right behavior (since the spec does not mandate the order, it is simply a "recommendation"), there is no harm in fixing libavif to produce AVIF animations that are consumable on Android. Verification: * Compliance warden has no issues with the new ordering. * Files are playing back on Chrome like before.
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 check out/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), NASMThese 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.
A few tests written in C can be built by enabling the AVIF_BUILD_TESTS
CMake option.
The remaining tests can be built by enabling the AVIF_BUILD_TESTS
and AVIF_ENABLE_GTEST
CMake options. They require GoogleTest to be built locally with ext/googletest.cmd or installed on the system.
If you're building on Windows with Visual Studio 2022 and want to try out libavif without going through the build process, static library builds for both Debug and Release are available on AppVeyor.
libavif is written in C99.
Use clang-format to format the C sources from the top-level folder:
clang-format -style=file -i \ apps/*.c apps/shared/avifexif.* apps/shared/avifjpeg.* \ apps/shared/avifpng.* apps/shared/avifutil.* apps/shared/y4m.* \ examples/*.c include/avif/*.h src/*.c tests/*.c \ tests/gtest/*.h tests/gtest/*.cc tests/oss-fuzz/*.cc
Use cmake-format to format the CMakeLists.txt files from the top-level folder:
cmake-format -i \ CMakeLists.txt \ tests/CMakeLists.txt \ cmake/Modules/Find*.cmake \ contrib/CMakeLists.txt \ contrib/gdk-pixbuf/CMakeLists.txt \ android_jni/avifandroidjni/src/main/jni/CMakeLists.txt
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. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.