FFmpeg

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Tag: Branch: Tree: 4cb06874c7

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Author	SHA1	Message	Date
Diego Pettenò	3fc548df28	Make ff_inverse stay with libavutil, and optional copy it to libavcodec. The ff_inverse table is used by FASTDIV macro, defined in libavutil, but up to now the table was defined only in libavcodec. After this change, the main copy of ff_inverse is part of libavutil (just like FASTDIV), but if CONFIG_SMALL is unset, then a different copy is made available to libavcodec, to avoid the performance penalty of using an external look up table. Dynamic linking works, because the libraries are linked with -Bsymbolic, so the local copy of the symbol has priority over the external; static linking works because the table is on a standalone object file in both libraries, so the linker is able to discard one of the two. Tested on Linux/x86-64 and Mac OS X/x86-64. Originally committed as revision 24383 to svn://svn.ffmpeg.org/ffmpeg/trunk	15 years ago

Author

SHA1

Message

Date

Diego Pettenò

3fc548df28

Make ff_inverse stay with libavutil, and optional copy it to libavcodec.

The ff_inverse table is used by FASTDIV macro, defined in libavutil, but up
to now the table was defined only in libavcodec.

After this change, the main copy of ff_inverse is part of libavutil (just
like FASTDIV), but if CONFIG_SMALL is unset, then a different copy is made
available to libavcodec, to avoid the performance penalty of using an
external look up table.

Dynamic linking works, because the libraries are linked with -Bsymbolic, so
the local copy of the symbol has priority over the external; static linking
works because the table is on a standalone object file in both libraries,
so the linker is able to discard one of the two.

Tested on Linux/x86-64 and Mac OS X/x86-64.

Originally committed as revision 24383 to svn://svn.ffmpeg.org/ffmpeg/trunk

15 years ago

1 Commits (4cb06874c7c5f69685c391e599f0c1f7194e2ad7)