Its useful to support the official decoder for comparission and debugging.

This reverts commit f9def9ccc6.

Conflicts:

	Changelog
	configure
	libavcodec/allcodecs.c
	libavcodec/libvorbis.c

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Code mostly inspired by vp8's MC, however:
- its MMX2 horizontal filter is worse because it can't take advantage of
  the coefficient redundancy
- that same coefficient redundancy allows better code for non-SSSE3 versions

Benchmark (rounded to tens of unit):
        V8x8  H8x8  2D8x8  V16x16  H16x16  2D16x16
C       445    358   985    1785    1559    3280
MMX*    219    271   478     714     929    1443
SSE2    131    158   294     425     515     892
SSSE3   120    122   248     387     390     763

End result is overall around a 15% speedup for SSSE3 version (on 6 sequences);
all loop filter functions now take around 55% of decoding time, while luma MC
dsp functions are around 6%, chroma ones are 1.3% and biweight around 2.3%.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This involves a division that should be a shift.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

The vertically interpolating variants of these functions read
ahead one line to optimise the loop.  On the last line processed,
this might be outside the buffer.  Fix these invalid reads by
processing the last line outside the loop.

Signed-off-by: Mans Rullgard <mans@mansr.com>

This allows compiling the Xvid rate control code without the encoder.

libavcodec/jpeglsdec.c:54:9: warning: variable ‘len’ set but not used

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Using release_buffer and get_buffer as currently might
not prefer the previous frame contents which the
decoder relies on.
This leads to horrible playback in players using direct
rendering like MPlayer.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes Ticket1250

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Diego Biurrun <diego@biurrun.de>

Fixes Ticket1232

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes ticket #1190.

Reviewed-by: Paul B Mahol

Unlike other variants, for YUY2 we need to use different prediction:
* on line 0 for luma we should left predict starting from the second pixel
* on line 1 we should left predict first 4 pixels for luma and 2 for chroma
* median prediction employed here is taken directly from HuffYUV

Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Also update libav->ffmpeg as theres pretty much no code left from libav.
The new code is faster, requires fewer mallocs and less memory. Its
also half the number of lines of code.

This code is not 100% identical in behavior to the previous, but the
differences appear to be rather limitations of the previous design
than intended though i could be wrong of course.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

16 seems a bit tight for current high end and expected near term future boxes.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Prevents subsequent overreads when these numbers are used as indices
in arrays.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>

See Ticket420

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Reviewed-by: Benjamin Larsson <benjamin@southpole.se>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

It is already set to 0 by av_free_packet()

We no longer have any audio encoders using AVCodec.encode().

This also involves making some function static and changing the name
prefixes of some functions and structures.

libavcodec/txd.c:49:60: warning: variable ‘mipmap_count’ set but not used

libavcodec/mmvideo.c:87:9: warning: variable ‘i’ set but not used