This directory contains build files for dav1d. The actual library source is in $TOPSRCDIR/third_party/dav1d/ Any patches or additional configuration to be applied to the upstream source should be kept here in the media/libdav1d directory. To update the library source and build config files, execute ./mach vendor media/libdav1d/moz.yaml To update to a specific upstream git tag or commit, use ./mach vendor media/libdav1d/moz.yaml -r The upstream git repository is https://code.videolan.org/videolan/dav1d To update to a fork, use ./mach vendor media/libdav1d/moz.yaml --repo [-r ] The rough steps are: - Execute ./mach vendor media/libdav1d/moz.yaml -r {tag-name} # ex: ./mach vendor media/libdav1d/moz.yaml -r 0.6.0 - Update ./moz.build and ./asm/moz.build to add new files and remove deleted ones using third_party/dav1d/src/meson.build as a guide (confirm with the diff) (note the empty .asm file in x86_64) - Some assembly files (notably avx2-specific ones) will generate no code on win32 builds, leading to a nasm failure like: "panic: assertion cv8_state.source_files != NULL failed at output/codeview.c:517" These files can be identified by the `%if ARCH_X86_64` conditional around the entire contents. To work around this error, move the sources to the moz.build block with the `if CONFIG['CPU_ARCH'] == 'x86_64'` conditional. See https://bugzilla.mozilla.org/show_bug.cgi?id=1712832 and https://bugzilla.nasm.us/show_bug.cgi?id=3392658 - Some files will be automatically added to the various autovendored_sources.mozbuild files. In the case of the asm dir, these may cause build failures on particular platforms which can be resolved by moving those out of autovendored_sources.mozbuild and into the regular moz.build which has a condition on CONFIG['CPU_ARCH']. - Files ending in _tmpl.c may be automatically added to SOURCES, resulting in build failures. To fix this, the file must be moved to the appropriate bitdepth_basenames list where generate_source.py will generate the templates into buildable source files. In general, all *_tmpl.c files require BITDEPTH to be defined. - Clone the tag from the dav1d repo and build a stand-alone libdav1d following the steps here: https://code.videolan.org/videolan/dav1d#compile - Copy vcs_version.h from the local build/include/vcs_version.h to media/libdav1d/vcs_version.h - Copy version.h from local build/include/dav1d/version.h to media/libdav1d/version.h - Add new options, if any, in moz.build or config.h Tips: - If you see build failures in build-linux64-base-toolchains (or similar jobs) dav1d may now require a higher minimum nasm version than our base toolchains currently support. A bug updating the minimum nasm version will probably be necessary.