Reduce diff with Libav.

Based on 19be5fb7 by Luca Barbato.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Found-by: Luca Barbato
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

It is used to select functions that work with 9-15bits.

Make sure the scaling functions for the 9-15bits are used for
9-15bits bit depths correctly.

It is an internal swscale symbol and thus should not be exported.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Diego Biurrun <diego@biurrun.de>

This reverts commit 1df908f33f. The expected
performance improvements are essentially non-existent.

This patch addresses Trac ticket #5570. The optimized functions are in file
libswscale/ppc/input_vsx.c. Each optimized function name is a concatenation of the
corresponding name in libswscale/input.c with suffix _vsx.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

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

Removed previous swscale code under '#ifndef NEW_FILTER'
and removed unused fields of SwsContext

./ffmpeg -nostats -f lavfi -i testsrc2=4k:d=2 -vf bench=start,scale=1024x1024,bench=stop -f null -

    before: t:0.489726 avg:0.489883 max:0.491852 min:0.489482
    after:  t:0.256515 avg:0.256458 max:0.256999 min:0.253755

Signed-off-by: Lou Logan <lou@lrcd.com>

Fixes: out of array reads
Fixes: 07e8b9c5d348ccdf7add0f37de20cf6c/asan_heap-oob_27e8df7_6849_e56653f768070ec8cb52f587048444c2.mov

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This makes SWS more robust
Fixes: 07650a772d98aa63b0fed6370dc89037/asan_heap-oob_27ddeaf_2657_2c81ff264dee5d9712cb3251fb9c3bbb.264
Fixes: out of array read

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

It is an internal swscale symbol and thus should not be exported.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

When scaling only a slice of a frame the output was written always
in the first lines leaving the rest of the frame black.

The first just does the blending and wouldnt do anything with the colorspace values

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

The new fields can be accessed directly and are more intelligible.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

+added gamma conversion to refactored code

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Process more lines in a single pass to improve performance

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

+ split color conversion from scaling
- disabled gamma correction, until it's refactored too

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes Ticket4746

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This simplifies allocating and initializing swscale contexts with custom options.
The function is internal currently but could be moved into the public header

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

This avoids using up a bit of the public flags

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

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

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

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

Fixes out of array access
Fixes: case2_bad_read_yuv2rgbx32.mp4
Found-by: Michal Zalewski <lcamtuf@coredump.cx>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes Ticket3170

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

Signed-off-by: James Almer <jamrial@gmail.com>