ffmpeg | branch: master | Christophe Gisquet <[email protected]> | Thu Jul 10 20:49:06 2014 +0200| [8da1defe6986aab8506203c6e12f44d4df62672e] | committer: Michael Niedermayer
libavutil: document side effects of macros Signed-off-by: Michael Niedermayer <[email protected]> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8da1defe6986aab8506203c6e12f44d4df62672e --- libavutil/intreadwrite.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/libavutil/intreadwrite.h b/libavutil/intreadwrite.h index 7ee6977..51fbe30 100644 --- a/libavutil/intreadwrite.h +++ b/libavutil/intreadwrite.h @@ -50,6 +50,14 @@ typedef union { * AV_[RW][BLN](16|24|32|48|64) and AV_(COPY|SWAP|ZERO)(64|128) macros. * Preprocessor symbols must be defined, even if these are implemented * as inline functions. + * + * R/W means read/write, B/L/N means big/little/native endianness. + * The following macros require aligned access, compared to their + * unaligned variants: AV_(COPY|SWAP|ZERO)(64|128), AV_[RW]N[8-64]A. + * Incorrect usage may range from abysmal performance to crash + * depending on the platform. + * + * The unaligned variants are AV_[RW][BLN][8-64] and AV_COPY*U. */ #ifdef HAVE_AV_CONFIG_H _______________________________________________ ffmpeg-cvslog mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
