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77753f874a
This is a bugfix for ARMv4 assembly implementation of 'j_rev_dct'
function.
The problem was in the incorrect partially empty row detection. Even
if the first two coefficients in the row were nonzero, it handled this
just like the case with only the first nonzero coefficient.
Now this function produces exactly the same output as the stripped
down reference C version of 'j_rev_dct' (with the nested checks like
'if (d6) { if (d2) { ...' always evaluated as true, avoiding shortcut
branches).
Originally committed as revision 15805 to svn://svn.ffmpeg.org/ffmpeg/trunk
FFmpeg README ------------- 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * Read the file COPYING.LGPL. FFmpeg and the associated libraries EXCEPT for libpostproc and libswscale are licensed under the GNU Lesser General Public License. * libpostproc and libswscale are distributed under the GNU General Public License, see the file COPYING.GPL for details. Their compilation and use in FFmpeg is optional. * The file libavcodec/i386/idct_mmx.c is distributed under the GNU General Public License. It is strictly an optimization and its use is optional. * The file libavcodec/ac3dec.c is distributed under the GNU General Public License. In order for (E-)AC-3 decoding to work you need to enable GPL components. * The file libavdevice/x11grab.c is distributed under the GNU General Public License. X11 grabbing is optional. * The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c are taken from libjpeg, see the top of the files for licensing details. * The file libavcodec/fdctref.c is copyrighted by the MPEG Software Simulation Group with all rights reserved. It is only used to create a DCT test program and not compiled into libavcodec.