lavfi: switch to AVFrame.

Deprecate AVFilterBuffer/AVFilterBufferRef and everything related to it
and use AVFrame instead.
mpegvideo_enc: drop support for reusing the input motion vectors.

This misfeature is most likely completely useless and conflicts with
removing the mpegvideo-specific fields from AVFrame. In the improbable
case it is actually useful, it should be reimplemented in a better way.
Add some fate dependencies to fix make fate with --disable-avdevice.
Add some fate dependencies to fix make fate with --disable-everything.
lavd/v4l2: correctly handle error conditions in mmap_read_frame()

In particular:

1) save errno before it (possibly) gets overwritten by other calls
2) do not forget to enqueue the buffer again in case of error

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavd/v4l2: simplify code

struct buff_data contains a pointer to struct video_data, so passing the
file descriptor again is redundant.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
dsputil: make square put/avg_pixels functions local to h264qpel.

Put a copy of the 8bit functions only in dsputil, where they are used
for some other things (e.g. mpeg4qpel, mspel, cavsqpel). We could perhaps
also try to share specifically the 8bit functions from h264qpel between
it and the others, but that will be slightly more complicated. H264qpel
already had these functions, so we can simply remove the duplicates.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
x86/qpel: move fullpel and l2 functions to separate file.

This way, they can be shared between mpeg4qpel and h264qpel without
requiring either one to be compiled unconditionally.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavfi/showspectrum: fix outpicref initialization.

In 81f2549, output pixel format was changed from rgb24 to planar yuv,
but the initialization was left unchanged. As a result, the chroma
planes were left uninitalized. This was not noticed since the current
ff_get_video_buffer() seems to be initializing the buffer. This won't be
the case anymore after the Evil Plan.
lavu/frame: copy the channels field.
port FFmpeg lavc frame specificities to lavu functions.
Revert "build: disable iconv by default."

This reverts commit 9ad3cd5b5f848eb3cd033be515d34296f099148b.

The misdetection on OS X should be fixed, we will only get
problem reports if auto-detection is enabled.
Merge commit '7e350379f87e7f74420b4813170fe808e2313911'

* commit '7e350379f87e7f74420b4813170fe808e2313911':
  lavfi: switch to AVFrame.

Conflicts:
	doc/filters.texi
	libavfilter/af_ashowinfo.c
	libavfilter/audio.c
	libavfilter/avfilter.c
	libavfilter/avfilter.h
	libavfilter/buffersink.c
	libavfilter/buffersrc.c
	libavfilter/buffersrc.h
	libavfilter/f_select.c
	libavfilter/f_setpts.c
	libavfilter/fifo.c
	libavfilter/split.c
	libavfilter/src_movie.c
	libavfilter/version.h
	libavfilter/vf_aspect.c
	libavfilter/vf_bbox.c
	libavfilter/vf_blackframe.c
	libavfilter/vf_delogo.c
	libavfilter/vf_drawbox.c
	libavfilter/vf_drawtext.c
	libavfilter/vf_fade.c
	libavfilter/vf_fieldorder.c
	libavfilter/vf_fps.c
	libavfilter/vf_frei0r.c
	libavfilter/vf_gradfun.c
	libavfilter/vf_hqdn3d.c
	libavfilter/vf_lut.c
	libavfilter/vf_overlay.c
	libavfilter/vf_pad.c
	libavfilter/vf_scale.c
	libavfilter/vf_showinfo.c
	libavfilter/vf_transpose.c
	libavfilter/vf_vflip.c
	libavfilter/vf_yadif.c
	libavfilter/video.c
	libavfilter/vsrc_testsrc.c
	libavfilter/yadif.h

Following are notes about the merge authorship and various technical details.

Michael Niedermayer:
  * Main merge operation, notably avfilter.c and video.c
  * Switch to AVFrame:
    - afade
    - anullsrc
    - apad
    - aresample
    - blackframe
    - deshake
    - idet
    - il
    - mandelbrot
    - mptestsrc
    - noise
    - setfield
    - smartblur
    - tinterlace
  * various merge changes and fixes in:
    - ashowinfo
    - blackdetect
    - field
    - fps
    - select
    - testsrc
    - yadif

Nicolas George:
  * Switch to AVFrame:
    - make rawdec work with refcounted frames. Adapted from commit
      759001c534287a96dc96d1e274665feb7059145d by Anton Khirnov.
      Also, fix the use of || instead of | in a flags check.
    - make buffer sink and src, audio and video work all together

Clément Bœsch:
  * Switch to AVFrame:
    - aevalsrc
    - alphaextract
    - blend
    - cellauto
    - colormatrix
    - concat
    - earwax
    - ebur128
    - edgedetect
    - geq
    - histeq
    - histogram
    - hue
    - kerndeint
    - life
    - movie
    - mp (with the help of Michael)
    - overlay
    - pad
    - pan
    - pp
    - pp
    - removelogo
    - sendcmd
    - showspectrum
    - showwaves
    - silencedetect
    - stereo3d
    - subtitles
    - super2xsai
    - swapuv
    - thumbnail
    - tile

Hendrik Leppkes:
  * Switch to AVFrame:
    - aconvert
    - amerge
    - asetnsamples
    - atempo
    - biquads

Matthieu Bouron:
  * Switch to AVFrame
    - alphamerge
    - decimate
    - volumedetect

Stefano Sabatini:
  * Switch to AVFrame:
    - astreamsync
    - flite
    - framestep

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Clément Bœsch <ubitux@gmail.com>
Signed-off-by: Hendrik Leppkes <h.leppkes@gmail.com>
Signed-off-by: Matthieu Bouron <matthieu.bouron@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

Merged-by: Michael Niedermayer <michaelni@gmx.at>
rawdec: work with refcounted frames.

Adapted from commit 759001c534287a96dc96d1e274665feb7059145d
by Anton Khirnov.

Also, fix the use of || instead of | in a flags check.
lavc/rawdec: set field order on decoded frame.
ffmpeg: do not give away our reference to the frame.

Note: the logic here is temporary until the updates to
ffmpeg.c are merged.
fate: disable sub2video

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
doc: fix examples.
lavu/frame: fix not/note typo in doxy.
Merge commit '6e7b50b4270116ded8b874d76cb7c5b1a0341827'

* commit '6e7b50b4270116ded8b874d76cb7c5b1a0341827':
  mpegvideo_enc: drop support for reusing the input motion vectors.

Conflicts:
	libavcodec/motion_est.c

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