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| author | Christophe Gisquet <christophe.gisquet@gmail.com> | 2014-07-10 20:49:06 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-07-19 14:55:46 +0200 |
| commit | 8da1defe6986aab8506203c6e12f44d4df62672e (patch) | |
| tree | 12185e3edf4f9653313c78c012a6b93027699b43 /libavutil/intreadwrite.h | |
| parent | 5e55c7e1bcb767e6af17c29f6aaebff4d6fd0703 (diff) | |
| download | ffmpeg-8da1defe6986aab8506203c6e12f44d4df62672e.tar.gz | |
libavutil: document side effects of macros
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavutil/intreadwrite.h')
| -rw-r--r-- | libavutil/intreadwrite.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libavutil/intreadwrite.h b/libavutil/intreadwrite.h index 7ee6977554..51fbe30a23 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 |