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FFmpeg git repo
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Nil Admirari cc5844da98 libavutil: Add wchartoutf8(), wchartoansi(), utf8toansi(), getenv_utf8(), freeenv_utf8() and getenv_dup() 
wchartoutf8() converts strings returned by WinAPI into UTF-8,
which is FFmpeg's preffered encoding.

Some external dependencies, such as AviSynth, are still
not Unicode-enabled. utf8toansi() converts UTF-8 strings
into ANSI in two steps: UTF-8 -> wchar_t -> ANSI.
wchartoansi() is responsible for the second step of the conversion.
Conversion in just one step is not supported by WinAPI.

Since these character converting functions allocate the buffer
of necessary size, they also facilitate the removal of MAX_PATH limit
in places where fixed-size ANSI/WCHAR strings were used
as filename buffers.

On Windows, getenv_utf8() wraps _wgetenv() converting its input from
and its output to UTF-8. Strings returned by getenv_utf8()
must be freed by freeenv_utf8().

On all other platforms getenv_utf8() is a wrapper around getenv(),
and freeenv_utf8() is a no-op.

The value returned by plain getenv() cannot be modified;
av_strdup() is usually used when modifications are required.
However, on Windows, av_strdup() after getenv_utf8() leads to
unnecessary allocation. getenv_dup() is introduced to avoid
such an allocation. Value returned by getenv_dup() must be freed
by av_free().

Because of cleanup complexities, in places that only test the existence
of an environment variable or compare its value with a string
consisting entirely of ASCII characters, the use of plain getenv()
is still preferred. (libavutil/log.c check_color_terminal()
is an example of such a place.)

Plain getenv() is also preffered in UNIX-only code,
such as bktr.c, fbdev_common.c, oss.c in libavdevice
or af_ladspa.c in libavfilter.

Signed-off-by: Martin Storsjö <martin@martin.st>
2022-06-21 13:27:46 +03:00
compat
doc doc/decoders: add docs for v210 decoder 2022-06-20 22:56:50 +02:00
ffbuild ffbuild/common: Fix CPPFLAGS applied for compiling C++ files 2022-05-24 21:30:52 +02:00
fftools fftools/ffprobe: report avio errors 2022-06-20 23:51:54 +02:00
libavcodec avcodec/v210dec: add support for strideless v210 as in BOXX files 2022-06-20 22:56:50 +02:00
libavdevice avdevice/oss_dec: account for sample size when computing timestamp 2022-06-19 23:01:20 +02:00
libavfilter lavfi/drawutils: improve colorspace support 2022-06-19 19:18:34 -05:00
libavformat avformat/matroskaenc: Don't check twice whether to write tags 2022-06-20 23:42:28 +02:00
libavutil libavutil: Add wchartoutf8(), wchartoansi(), utf8toansi(), getenv_utf8(), freeenv_utf8() and getenv_dup() 2022-06-21 13:27:46 +03:00
libpostproc lib*/version: Move library version functions into files of their own 2022-05-10 06:49:32 +02:00
libswresample swresample/noise_shaping_data: Remove unused tables 2022-06-15 04:58:14 +02:00
libswscale all: Replace if (ARCH_FOO) checks by #if ARCH_FOO 2022-06-15 04:56:37 +02:00
presets
tests avformat/matroskaenc: Don't waste bytes to Write Tag length fields 2022-06-20 23:42:28 +02:00
tools tools/target_dec_fuzzer: add a custom get_buffer2() implementation 2022-06-06 09:40:44 -03:00
.gitattributes
.gitignore gitignore: add config_components.h 2022-03-17 18:35:41 -03:00
.mailmap
.travis.yml
Changelog avfilter: add virtualbass filter 2022-06-16 10:23:30 +02:00
configure libavutil: Add wchartoutf8(), wchartoansi(), utf8toansi(), getenv_utf8(), freeenv_utf8() and getenv_dup() 2022-06-21 13:27:46 +03:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md
MAINTAINERS MAINTAINERS: add myself as maintainer for LoongArch. 2022-06-08 18:29:30 +02:00
Makefile Makefile: avoid cp-ing over existing executable files 2022-06-01 19:38:50 -05:00
README.md
RELEASE

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.