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1998d1d6af
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Andreas Rheinhardt 1998d1d6af avformat/au: Avoid allocation for metadata string 
When there are potentially annotation (i.e. metadata) fields to write,
au_get_annotations() is called to produce a string with them. To do so,
it uses an AVBPrint which is finalized to create the string. This is
wasteful, because it always leads to an allocation even if the string
actually fits into the internal buffer of the AVBPrint. This commit
changes this by making au_get_annotations() modify an AVBPrint that
resides on the stack of the caller (i.e. of au_write_header()).

Furthermore, the AVBPrint is now checked for truncation; limiting
the allocations implicit in the AVBPrint allowed to offload the overflow
checks. Notice that these were not correct before: The size parameter of
avio_write() is an int, yet the string in the AVBPrint was allowed to
grow bigger than INT_MAX. And if the length of the string was so near
UINT_MAX that the length + 32 overflowed, the old code would write the
first eight bytes of the string and nothing more, leading to an invalid
file.

Finally, the special case in which the metadata dictionary of the
AVFormatContext is empty (in which case one still has to write eight
binary zeroes) is now no longer treated specially, because this case
no longer incurs any allocation.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-07-18 18:18:41 +02:00
compat
doc avfilter/avf_showwavespic: add filter mode 2020-07-17 14:26:48 +02:00
ffbuild
fftools ffprobe: Allow unknown format private AVOptions 2020-07-02 19:24:56 +01:00
libavcodec avcodec/libaomenc: use pix_fmt descriptors where useful 2020-07-17 18:23:45 -03:00
libavdevice avdevice/decklink_dec: export timecode with s12m side data 2020-07-15 05:47:14 +08:00
libavfilter avfilter/vf_bilateral: simplify code a little 2020-07-18 10:22:12 +02:00
libavformat avformat/au: Avoid allocation for metadata string 2020-07-18 18:18:41 +02:00
libavresample
libavutil avutil/timecode: add description for SMPTE binary format 2020-07-15 05:47:14 +08:00
libpostproc
libswresample
libswscale swscale/tests/swscale: use 1 for indicating erros 2020-07-16 17:44:53 +02:00
presets
tests checkasm/vf_blend: use the correct depth parameters to initialize the blend modes 2020-07-12 11:30:23 -03:00
tools dnn_backend_native_layer_mathunary: add atanh support 2020-07-06 12:45:14 +08:00
.gitattributes
.gitignore
.mailmap mailmap: add entry for myself 2020-07-13 11:24:04 +08:00
.travis.yml
Changelog avcodec/hevcdec: Add VDPAU to list of supported formats 2020-07-09 20:54:11 -07:00
configure avdevice/decklink_dec: add support for extracting and outputing klv from vanc 2020-07-03 00:24:59 +02:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
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CREDITS
INSTALL.md
LICENSE.md
MAINTAINERS MAINTAINERS: add myself and gpg fingerprint 2020-07-17 21:57:18 +02:00
Makefile
README.md
RELEASE RELEASE: We are after the 4.3 branch point, update for that 2020-06-10 00:20:24 +02:00

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 a mean to alter decoded Audio and Video through chain of 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.