Originally committed as revision 23931 to svn://svn.ffmpeg.org/ffmpeg/trunk

If both /dev/random and /dev/urandom failed to return data, an
uninitialised value might be returned.  Since most systems have a
non-blocking /dev/urandom or have /dev/random with similar properties,
the chance of blocking is minimal, and the alternative of returning
non-random data is worse.

Originally committed as revision 23930 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23929 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23928 to svn://svn.ffmpeg.org/ffmpeg/trunk

Whose idea was it to have a CPU that didn't SIGILL on an invalid instruction?

Originally committed as revision 23927 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Rafaël Carré (rafael <dot> carre <at> gmail).

Originally committed as revision 23926 to svn://svn.ffmpeg.org/ffmpeg/trunk

This fixes a stack overflow.

Originally committed as revision 23925 to svn://svn.ffmpeg.org/ffmpeg/trunk

Necessary because of this GCC bug:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44474
To do this, convert some, but not all (!) of the variables in VP56RangeCoder
into local variables.
If we convert c->high into a local variable, gcc gets the stupids and refuses
to use a conditional move for the unpredictable main branch.

TODO: dispense with this bullshit and write an asm version.

Originally committed as revision 23924 to svn://svn.ffmpeg.org/ffmpeg/trunk

other filters.

Originally committed as revision 23923 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23922 to svn://svn.ffmpeg.org/ffmpeg/trunk

This incantation causes gcc 4.3 to generate cmov on x86, a vastly better option
than a completely unpredictable branch.
Hopefully this carries over to newer versions and other CPUs with conditionals.
~5 cycles saved per call on a Core i7.

Originally committed as revision 23921 to svn://svn.ffmpeg.org/ffmpeg/trunk

Negate "bits" to eliminate a negate in cache refilling.

Originally committed as revision 23920 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by XBMC

Originally committed as revision 23919 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Mike Scheutzow, scheutzow alcatel-lucent com

Originally committed as revision 23918 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Mike Scheutzow, scheutzow alcatel-lucent com

Originally committed as revision 23917 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23916 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23915 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Daniel Kristjansson, danielk cuymedia net

Originally committed as revision 23914 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23913 to svn://svn.ffmpeg.org/ffmpeg/trunk

Should allow for future SIMD optimizations.

Originally committed as revision 23912 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23911 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23910 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23909 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23908 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23907 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23906 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23905 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23904 to svn://svn.ffmpeg.org/ffmpeg/trunk

Attempt to read from /dev/urandom and /dev/random with O_NONBLOCK set.
If neither succeeds, proceed with fallbacks.

Originally committed as revision 23903 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23902 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23901 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23900 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23899 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23898 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Eli Friedman (at gmail).

Originally committed as revision 23897 to svn://svn.ffmpeg.org/ffmpeg/trunk

Makes it give correct results with e.g. gcc 4.4.
For unknown reasons the generate asm code also changes
on e.g. gcc 4.3, making the code a bit larger but also
a bit faster.

Originally committed as revision 23896 to svn://svn.ffmpeg.org/ffmpeg/trunk

"passing argument 1 of ‘av_memcpy_backptr’ from incompatible pointer type"

Patch by Eli Friedman, eli D friedman A gmail

Originally committed as revision 23895 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Eli Friedman, eli D friedman A gmail

Originally committed as revision 23894 to svn://svn.ffmpeg.org/ffmpeg/trunk

This function is called from the rv40_[hv]_loop_filter() wrappers
with some arguments constant, so it really needs to be inlined.

3% faster overall on Cortex-A8.

Originally committed as revision 23893 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23892 to svn://svn.ffmpeg.org/ffmpeg/trunk