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For certain types of filters where the intermediate sum of coefficients can go above the fixed-point equivalent of 1.0 in the middle of a filter, the sum of a 31-bit calculation can overflow in both directions and can thus not be represented in a 32-bit signed or unsigned integer. To work around this, we subtract 0x40000000 from a signed integer base, so that we're halfway signed/unsigned, which makes it fit even if it overflows. After the filter finishes, we add the scaled bias back after a shift. We use the same trick for 16-bit bpc YUV output routines. Signed-off-by: Mans Rullgard <mans@mansr.com> |
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doc | ||
libavcodec | ||
libavdevice | ||
libavfilter | ||
libavformat | ||
libavutil | ||
libpostproc | ||
libswscale | ||
presets | ||
tests | ||
tools | ||
.gitignore | ||
avconv.c | ||
avplay.c | ||
avprobe.c | ||
avserver.c | ||
Changelog | ||
cmdutils_common_opts.h | ||
cmdutils.c | ||
cmdutils.h | ||
common.mak | ||
configure | ||
COPYING.GPLv2 | ||
COPYING.GPLv3 | ||
COPYING.LGPLv2.1 | ||
COPYING.LGPLv3 | ||
CREDITS | ||
Doxyfile | ||
ffmpeg.c | ||
INSTALL | ||
library.mak | ||
LICENSE | ||
Makefile | ||
README | ||
RELEASE | ||
version.sh |
Libav README ------------ 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.