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Previously, we read elements from ff_aac_pow34sf_tab; however that table is initialized to zero; one needs to call ff_aac_float_common_init() to make sure that the table is initialized. However, given the range of the input values, a large number of entries in ff_aac_pow34sf_tab would give results outside of the range for signed 32 bit integers. As the largest aac_cb_maxval entry is 16, it seems more reasonable to produce values within an order of mangitude of that value. (When hitting INT_MIN, implementations may end up with different results depending on whether the value is negated as a float or as an int. This corner case is irrelevant in practice as this is way outside of the expected value range here.) Coincidentally, this fixes linking checkasm with Apple's older linker. (In Xcode 15, Apple switched to a new linker. The one in older toolchains seems to have a bug where it won't figure out to load object files from a static library, if the only symbol referenced in the object file is a "common" symbol, i.e. one for a zero-initialized variable. This issue can also be reproduced with newer Apple toolchains by passing -Wl,-ld_classic to the linker.) Signed-off-by: Martin Storsjö <martin@martin.st>
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.