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

Originally committed as revision 23891 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23890 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23889 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23888 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23887 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23886 to svn://svn.ffmpeg.org/ffmpeg/trunk

I'm not sure if this is supposed to be here, but it can't hurt.

Originally committed as revision 23885 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23884 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23883 to svn://svn.ffmpeg.org/ffmpeg/trunk

anything added

Originally committed as revision 23882 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23881 to svn://svn.ffmpeg.org/ffmpeg/trunk

Much faster VP8 C DSP functions; ~5-10% faster overall with asm off.

Originally committed as revision 23880 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23879 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23878 to svn://svn.ffmpeg.org/ffmpeg/trunk

Strip out most x264-specific stuff (not used anywhere in ffmpeg).

Originally committed as revision 23877 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23876 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23875 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23874 to svn://svn.ffmpeg.org/ffmpeg/trunk

Also add predict_4x4_dc MMXEXT function for vp8/h264.

Originally committed as revision 23873 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23872 to svn://svn.ffmpeg.org/ffmpeg/trunk

Short windows are of length 256 and begin at sample 448.

Originally committed as revision 23871 to svn://svn.ffmpeg.org/ffmpeg/trunk

This keeps the encoder from switching away from an wight short sequence
prematurely when attacks are detected two frames in a row. It also allows for
the legal and useful LONG_STOP_SEQUENCE to LONG_START_SEQUENCE transition.

Originally committed as revision 23870 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23869 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23868 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23867 to svn://svn.ffmpeg.org/ffmpeg/trunk

This fixes a valgrind error when encoding to ADTS.

Originally committed as revision 23866 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23865 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23864 to svn://svn.ffmpeg.org/ffmpeg/trunk