mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2026-08-11 12:19:29 +00:00
Andreas Rheinhardt
78193e6490
llviddsp functions typically operate on whole lines, i.e. the pointers are aligned to STRIDE_ALIGN. They can therefore avoid tail handling by just clobbering the padding (if any). The test gets a random width via 16 * av_clip(rnd(), 16, 128); in practice, it is very unlikely for rnd() to return a value between 16 and 128, so width is typically 16*16 or 16*128. Buffers of this size are allocated later. When rnd() returns an odd number in the allowed range (this happens for the seed 4161216273), the buffers used in the test don't contain the padding that exists in actual usage, leading to invalid stores and also to segmentation faults (usage of aligned load instructions on unaligned addresses). Fix this by adding the necessary alignment to the buffers. Also don't use a static variable to store width (it is unnecessary, because since the switch to libcheckasm, rnd() always returns the same sequence of random numbers for test runs with different instruction sets) and use a really random width, not something that is mostly just one of two values and always mod 16. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides means to alter decoded audio and video through a directed graph of connected filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements 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,ismindexandqt-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.