This gets rid of virtually useless hardcoded tables hackery. The reason
it is useless is that a 320 element lut is anyway placed regardless of
--enable-hardcoded-tables, from which all necessary tables are trivially
derived at runtime at very low cost:

sample benchmark (x86-64, Haswell, GNU/Linux, single run is really
what is relevant here since looping drastically changes the bench). Fluctuations
are on the order of 10% for the single run test:
39400 decicycles in aacsbr_tableinit,       1 runs,      0 skips
25325 decicycles in aacsbr_tableinit,       2 runs,      0 skips
18475 decicycles in aacsbr_tableinit,       4 runs,      0 skips
15008 decicycles in aacsbr_tableinit,       8 runs,      0 skips
13016 decicycles in aacsbr_tableinit,      16 runs,      0 skips
12005 decicycles in aacsbr_tableinit,      32 runs,      0 skips
11546 decicycles in aacsbr_tableinit,      64 runs,      0 skips
11506 decicycles in aacsbr_tableinit,     128 runs,      0 skips
11500 decicycles in aacsbr_tableinit,     256 runs,      0 skips
11183 decicycles in aacsbr_tableinit,     509 runs,      3 skips

Tested with FATE with/without --enable-hardcoded-tables.
Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

When the interpolated value is divided by the sum of weights, no
rounding is done, which means the value is truncated. This results in
a slight bias towards dark green in the interpolated area. Rounding
properly removes the bias.

I measured this change to reduce the interpolation error by 1 to 2 %
on average on a number of sample input and logo area combinations.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

exp2 is a faster function.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

pow is a very wasteful function for this purpose. A low hanging fruit
would be simply to replace with exp2f, and that does yield some speedup.
However, there are 2 drawbacks of this:
1. It does not exploit the integer nature of the argument.
2. (minor) Some platforms lack a proper exp2f routine, making benefits available
only to non broken libm.
3. exp2f does not solve the same issue that plagues pow, namely terrible
worst case performance. This is a fundamental issue known as the
"table-maker's dilemma" recognized by Prof. Kahan himself and
subsequently elaborated and researched by many others. All this is clear from benchmarks below.

This exploits the IEEE-754 format to get very good performance even in
the worst case for integer powers of 2. This solves all the issues noted
above. Function tested with clang usan over [-1000, 1000] (beyond range of
relevance for this, which is [-255, 255]), patch itself with FATE.

Benchmarks obtained on x86-64, Haswell, GNU-Linux via 10^5 iterations of
the pow call, START/STOP, and command ffplay ~/samples/jpeg2000/chiens_dcinema2K.mxf.
Low number of runs also given to prove the point about worst case:

pow:
 216270 decicycles in pow,       1 runs,      0 skips
 110175 decicycles in pow,       2 runs,      0 skips
  56085 decicycles in pow,       4 runs,      0 skips
  29013 decicycles in pow,       8 runs,      0 skips
  15472 decicycles in pow,      16 runs,      0 skips
   8689 decicycles in pow,      32 runs,      0 skips
   5295 decicycles in pow,      64 runs,      0 skips
   3599 decicycles in pow,     128 runs,      0 skips
   2748 decicycles in pow,     256 runs,      0 skips
   2304 decicycles in pow,     511 runs,      1 skips
   2072 decicycles in pow,    1022 runs,      2 skips
   1963 decicycles in pow,    2044 runs,      4 skips
   1894 decicycles in pow,    4091 runs,      5 skips
   1860 decicycles in pow,    8184 runs,      8 skips

exp2f:
 134140 decicycles in pow,       1 runs,      0 skips
  68110 decicycles in pow,       2 runs,      0 skips
  34530 decicycles in pow,       4 runs,      0 skips
  17677 decicycles in pow,       8 runs,      0 skips
   9175 decicycles in pow,      16 runs,      0 skips
   4931 decicycles in pow,      32 runs,      0 skips
   2808 decicycles in pow,      64 runs,      0 skips
   1747 decicycles in pow,     128 runs,      0 skips
   1208 decicycles in pow,     256 runs,      0 skips
    952 decicycles in pow,     512 runs,      0 skips
    822 decicycles in pow,    1024 runs,      0 skips
    765 decicycles in pow,    2047 runs,      1 skips
    722 decicycles in pow,    4094 runs,      2 skips
    693 decicycles in pow,    8190 runs,      2 skips

exp2fi:
   2740 decicycles in pow,       1 runs,      0 skips
   1530 decicycles in pow,       2 runs,      0 skips
    955 decicycles in pow,       4 runs,      0 skips
    622 decicycles in pow,       8 runs,      0 skips
    477 decicycles in pow,      16 runs,      0 skips
    368 decicycles in pow,      32 runs,      0 skips
    317 decicycles in pow,      64 runs,      0 skips
    291 decicycles in pow,     128 runs,      0 skips
    277 decicycles in pow,     256 runs,      0 skips
    268 decicycles in pow,     512 runs,      0 skips
    265 decicycles in pow,    1024 runs,      0 skips
    263 decicycles in pow,    2048 runs,      0 skips
    263 decicycles in pow,    4095 runs,      1 skips
    260 decicycles in pow,    8191 runs,      1 skips
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

This fixes out-of-bounds reads in avoid_clipping.
Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

In the merge commit 78265fcf this behaviour
was broken and the CORRUPT flag would never ever be set on a frame. However
the flag on the AVCodecContext was taken into account properly, including
AV_CODEC_FLAG2_SHOW_ALL.

The reason for this was that the recovered field of the next output picture
was always set to TRUE whenever one of the two AVCodecContext flags was set,
which made it impossible to detect later, before outputting, if the frame was
really recovered or not. Now don't set it to TRUE unless the frame is really
recovered and check the AVCodecContext flags right before outputting.
Signed-off-by: Sebastian Dröge <sebastian@centricular.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Makes no sense to enable for high bitrates, the coder does well enough.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

With only 7 coefficients per short window at most the extra precision
makes a difference and seems to reduce crackling and stddev even
further.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

* commit '6788baeb':
  log: Use a do {} while (0) for dlog
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '7d36474d':
  imgconvert: Re-enable the deprecation warnings
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'f7edcac0':
  avpicture: Suppress warning from deprecated code
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'b805482b':
  aac: Provide more information on the failure message
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'c5eb279e':
  g723: Add missing header
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '1077d8c8':
  configure: Add -framework CoreVideo when building the avfoundation indev
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'bf12a81c':
  configure: Replace `pr` since it is not provided by busybox

Not merged as requested by Timothy Gu.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '5f3a081b':
  avi: Spin out the logic to position to the next non-interleaved stream
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

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

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

Don't print a warning when dcadec_context_filter() returns positive
warning code. Most relevant warnings are now output through the callback
function.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Take request_channel_layout as a hint and don't force 2.0 downmix by
using both the 2CH and 6CH flags together.

Remove warnings about missing coefficients because they are no longer
relevant.

Honor AV_CH_LAYOUT_NATIVE and make it possible for native DTS channel
layout to be output.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Regression since 53f2ef2c.
Fixes ticket #5017.
Signed-off-by: Marton Balint <cus@passwd.hu>

Fix regression since a8bb81a0.

Spotted-by: RiCON

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

* commit 'cb49bb10':
  build: Move -Wcast-qual to the extra_warnings
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '0fc61c6a':
  avi: Validate the stream-id for DV as well
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'd017ed87':
  avi: Use the correct data type
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '7f57ea14':
  vsrc_color: Drop unneeded variable
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'ca5f386e':
  lavf: G.723.1 muxer
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'f023d57d':
  lavc: G.723.1 encoder

Split existing FFmpeg G.723.1 encoder into a new file.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '165cc6fb':
  g723_1: Move sharable functions to a separate file
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'aac996cc':
  g723_1: Rename files to better reflect their purpose
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>