ICC versions older than atleast 12.1.6 dont have the tzcnt intrinsics.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Matt Oliver <protogonoi@gmail.com>

Chapter-indexing can be expensive since chapters may be interspersed
throughout the entire file and may require many seeks - especially
costly when consuming a video over a remote protocol like http.
Furthermore it is often unnecessary, especially when only trying to get
video info (e.g. via ffprobe).
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Also support disabling them as they seem to cause problems to some
Users. They are also not allowed in IRT D-10 thus the default for
mxf_d10 is not to write them

This also decreases the filesize when no user comment are stored
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

this fixes the return code of avcodec_decode_video2 for gif decoding
and the gif frame data buffer is skipped properly
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

A negative sample rate causes assertion failures in av_rescale_rnd.
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

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

Remove loops, output is also more interesting.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

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

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

* commit 'aeda1121':
  lavf: factor out freeing an AVStream
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '3efd71b4':
  avconv: set packet duration for CFR video streams
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'a0c71a57':
  lavf: initialize cur_dts to AV_NOPTS_VALUE for muxing
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'cc96018c':
  libopenh264enc: Set AVOption data type
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'fcc49924':
  vdpau: Remove a spurious CONFIG_H263_VDPAU_HWACCEL
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '563e6d86':
  segafilm: drop the "song and dance" for cinepak
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '1e791ee3':
  segafilm: set video and audio stream duration
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'c012c6f1':
  segafilm: implement seeking
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '2ec112f7':
  vf_pad: fix x, y option expression evaluation
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'e2854e73':
  avresample: Document avresample_open() a little better
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'f128b8e1':
  mov: detect cover art pictures by content
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '50d2a3b5':
  flashsv: Initialize the block array

Not merged, blocks are already zeroed when appropriate.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'de41b555':
  truemotion2: Fix the buffer check
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '4a326923':
  mimic: Always return on failure
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '452d659a':
  msnwc_tcp: Use the correct return values
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'f8d10511':
  cosmetics: msnwc_tcp: Reformat
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '4dfbc7a7':
  msnwc_tcp: Correctly report failure
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '60f50374':
  rpza: Check the blocks left before processing one
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '0b699920':
  lagarith: Correctly compute hash_shift
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit '1e7ff5ac':
  nut: Use the correct codec_tag when multiple are available

Not merged since ffnutenc handles the codec_tag differently
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

Fixes compilation of host tool aacps_fixed_tablegen.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>

This avoid double calling functions
Found-by: Muhammad Faiz <mfcc64@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes apparent mmal_port_disable() freezes in ffmmal_stop_decoder() when
calling ffmmal_decode() with flush semantics a large number of times in
a row.

Found-by: Hendrik Leppkes <h.leppkes@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Allows one to do:

    ffmpeg -s 1920x1080          -i blah.v210 ...
    ffmpeg -s 1920x1080 -f v210x -i blah.yuv10 ...

Fixes #1869.
Reviewed-by: James Almer <jamrial@gmail.com>
Reviewed-by: Kieran Kunhya <kierank@obe.tv>

The CMP variable seems to have been inherited from fate-api-seek which set it to null

the mxf reference needed a change due to c7e14a27Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This is similar to commit ec38a1ba for aac_decode_frame_int.
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>

This fixes a SIGFPE crash in the aac_fixed decoder.
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com>

Somewhat ironic that this "safe" interface is actually being used
unsafely here. This fixes the usage preventing potential null pointer
dereference, where the old code was doubly broken: ctime can return
NULL, and ctime can return an arbitrarily long buffer.
Reviewed-by: Mark Harris <mark.hsj@gmail.com>
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

This may be a slightly surprising optimization, but is actually based on
an understanding of how math libraries compute trigonometric functions.
Explanation is given here so that future development uses libm more effectively
across the codebase.

All libm's essentially compute transcendental functions via some kind of
polynomial approximation, be it Taylor-Maclaurin or Chebyshev.
Correction terms are added via polynomial correction factors when needed
to squeeze out the last bits of accuracy. Lookup tables are also
inserted strategically.

In the case of trigonometric functions, periodicity is exploited via
first doing a range reduction to an interval around zero, and then using
some polynomial approximation.

This range reduction is the most natural way of doing things - else one
would need polynomials for ranges in different periods which makes no
sense whatsoever.

To avoid the need for the range reduction, it is helpful to feed in
arguments as close to the origin as possible for the trigonometric
functions. In fact, this also makes sense from an accuracy point of view:
IEEE floating point has far more resolution for small numbers than big ones.

This patch does this for the Blackman-Nuttall filter, and yields a
non-negligible speedup.

Sample benchmark (x86-64, Haswell, GNU/Linux)
test: fate-swr-resample-dblp-2626-44100
old:
18893514 decicycles in build_filter (loop 1000),     256 runs,      0 skips
18599863 decicycles in build_filter (loop 1000),     512 runs,      0 skips
18445574 decicycles in build_filter (loop 1000),    1000 runs,     24 skips

new:
16290697 decicycles in build_filter (loop 1000),     256 runs,      0 skips
16267172 decicycles in build_filter (loop 1000),     512 runs,      0 skips
16251105 decicycles in build_filter (loop 1000),    1000 runs,     24 skips
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>