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Andreas Rheinhardt 20b0d24c2f Makefile: Redo duplicating object files in shared builds In case of shared builds, some object files containing tables are currently duplicated into other libraries: log2_tab.c, golomb.c, reverse.c. The check for whether this is duplicated is simply whether CONFIG_SHARED is true. Yet this is crude: E.g. libavdevice includes reverse.c for shared builds, but only needs it for the decklink input device, which given that decklink is not enabled by default will be unused in most libavdevice.so. This commit changes this by making it more explicit about what to duplicate from other libraries. To do this, two new Makefile variables were added: SHLIBOBJS and STLIBOBJS. SHLIBOBJS contains the objects that are duplicated from other libraries in case of shared builds; STLIBOBJS contains stuff that a library has to provide for other libraries in case of static builds. These new variables provide a way to enable/disable with a finer granularity than just whether shared builds are enabled or not. E.g. lavd's Makefile now contains: SHLIBOBJS-$(CONFIG_DECKLINK_INDEV) += reverse.o Another example is provided by the golomb tables. These are provided by lavc for static builds, even if one uses a build configuration that makes only lavf use them. Therefore lavc's Makefile contains STLIBOBJS-$(CONFIG_MXF_MUXER) += golomb.o, whereas lavf's Makefile has a corresponding SHLIBOBJS-$(CONFIG_MXF_MUXER) += golomb_tab.o. E.g. in case the MXF muxer is the only component needing these tables only libavformat.so will contain them for shared builds; currently libavcodec.so does so, too. (There is currently a CONFIG_EXTRA group for golomb. But actually one would need two groups (golomb_avcodec and golomb_avformat) in order to know when and where to include these tables. Therefore this commit uses a Makefile-based approach for this and stops using these groups for the users in libavformat.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>		3 years ago
compat	Replace all occurences of av_mallocz_array() by av_calloc()	3 years ago
doc	doc/APIchanges: Fill in missing things	3 years ago
ffbuild	Makefile: Redo duplicating object files in shared builds	3 years ago
fftools	fftools: provide media type info for devices	3 years ago
libavcodec	Makefile: Redo duplicating object files in shared builds	3 years ago
libavdevice	Makefile: Redo duplicating object files in shared builds	3 years ago
libavfilter	Makefile: Redo duplicating object files in shared builds	3 years ago
libavformat	Makefile: Redo duplicating object files in shared builds	3 years ago
libavutil	lib*/version.h: Bump Versions after release/5.0 branch	3 years ago
libpostproc	lib*/version.h: Bump Versions after release/5.0 branch	3 years ago
libswresample	Makefile: Redo duplicating object files in shared builds	3 years ago
libswscale	Makefile: Redo duplicating object files in shared builds	3 years ago
presets	…
tests	fate/libswcale: add missing samples dependency to sws-slice tests	3 years ago
tools	tools/target_dec_fuzzer: Adjust threshold for prores	3 years ago
.gitattributes	fate: add SCC test	8 years ago
.gitignore	build: detect Metal.framework and build .metal files	3 years ago
.mailmap	mailmap: add entry for myself	4 years ago
.travis.yml	Merge commit '899ee03088d55152a48830df0899887f055da1de'	6 years ago
CONTRIBUTING.md	Add CONTRIBUTING.md	8 years ago
COPYING.GPLv2	…
COPYING.GPLv3	…
COPYING.LGPLv2.1	…
COPYING.LGPLv3	…
CREDITS	…
Changelog	avfilter: add anlmf filter	3 years ago
INSTALL.md	INSTALL.md: Fix Markdown formatting	6 years ago
LICENSE.md	avfilter/vf_geq: Relicense to LGPL	5 years ago
MAINTAINERS	MAINTAINERS: add my gpg fingerprint	3 years ago
Makefile	Makefile: Redo duplicating object files in shared builds	3 years ago
README.md	README: fix typo and description of libavfilter	3 years ago
RELEASE	Bump Versions before release/4.4 branch	4 years ago
configure	Makefile: Redo duplicating object files in shared builds	3 years ago

README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

libavcodec provides implementation of a wider range of codecs.
libavformat implements streaming protocols, container formats and basic I/O access.
libavutil includes hashers, decompressors and miscellaneous utility functions.
libavfilter provides means to alter decoded audio and video through a directed graph of connected filters.
libavdevice provides an abstraction to access capture and playback devices.
libswresample implements audio mixing and resampling routines.
libswscale implements color conversion and scaling routines.

Tools

ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
ffplay is a minimalistic multimedia player.
ffprobe is a simple analysis tool to inspect multimedia content.
Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Coding examples are available in the doc/examples directory.

License

FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.