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Martin Storsjö d7320ca3ed arm: Avoid using .dn register aliases 
clang now (in the upcoming 5.0 version) is capable of building our
arm assembly without relying on gas-preprocessor, although clang/LLVM
doesn't support .dn register aliases.

The VC1 MC assembly was only built and used if the chosen assembler
supported the .dn directives though. This was supported as long as
gas-preprocessor was used.

This means that VC1 decoding got a speed regression on clang 5.0,
unless the user manually chose using gas-preprocessor again.

By avoiding using the .dn register aliases, we can build the VC1 MC
assembly with the latest clang version.

Support for the .dn/.qn directives in clang/LLVM isn't actively planned,
see https://bugs.llvm.org/show_bug.cgi?id=18199.

This partially reverts 896a5bff64.

Signed-off-by: Martin Storsjö <martin@martin.st>
2017-05-15 09:52:18 +03:00
avbuild build: Generalize yasm/nasm-related variable names 2017-03-01 10:18:15 +01:00
avtools avconv: Support setting the hardware device to use when filtering 2017-04-30 16:13:50 +01:00
compat compat/atomics: add typecasts in atomic_compare_exchange_strong() 2016-12-08 15:53:58 -05:00
doc aac: Split function to parse ADTS header data into public and private part 2017-05-02 18:50:34 +02:00
libavcodec arm: Avoid using .dn register aliases 2017-05-15 09:52:18 +03:00
libavdevice avfoundation: update to use AVCodecParameters 2017-04-26 11:47:31 -04:00
libavfilter vf_hwmap: Add reverse mapping for hardware frames 2017-04-30 17:33:18 +01:00
libavformat mpjpeg: Use proper CR/LF in multipart headers 2017-05-11 11:05:42 +03:00
libavresample Bump major versions of all libraries 2017-03-23 09:56:20 +01:00
libavutil arm: Check for the .arch directive in configure 2017-05-08 14:21:08 +03:00
libswscale swscale-test: const correctness 2017-04-24 16:10:05 +02:00
presets
tests checkasm: hevc: Add a hevc_ prefix to the add_residual functions 2017-04-21 13:32:44 +03:00
tools build: Move entries related to building TOOLS to a subdirectory Makefile 2016-12-07 11:02:31 +01:00
.gitattributes Treat all '*.pnm' files as non-text file 2014-11-28 17:52:43 -05:00
.gitignore build: Ignore generated .version files 2017-02-03 11:37:53 +01:00
.travis.yml travis: Exclude gcc for the macOS target 2017-04-20 12:53:08 +02:00
Changelog Add ClearVideo decoder 2017-04-25 15:39:10 +02:00
configure arm: Avoid using .dn register aliases 2017-05-15 09:52:18 +03:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL
LICENSE Remove the legacy X11 screen grabber 2016-07-29 19:03:10 +02:00
Makefile build: Allow generating dependencies as a side-effect of assembling 2017-03-01 10:18:15 +01:00
README
README.md doc: Add travis badge 2015-09-14 00:19:08 +02:00
RELEASE Make the RELEASE file match with the most recent tag 2016-10-14 13:52:51 -04:00

README.md

Libav

Build Status

Libav 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.
  • libavresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • avconv is a command line toolbox to manipulate, convert and stream multimedia content.
  • avplay is a minimalistic multimedia player.
  • avprobe is a simple analisys 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

Conding examples are available in the doc/example directory.

License

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