Warning note suggested by Reimar.

The functions which actually drive the filter graph by pushing
frames through it need to ensure an aligned stack for SIMD functions.

This fixes a crash in YADIF filter when using a mingw build in a MSVC application.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Regression since de3e0ab3.

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

The filter already checks that width (and height) are greater than 3.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

These smaller samples do not need to be unpacked to double words
allowing the code to process more pixels every iteration (still 2 in MMX
but 6 in SSE2).  It also avoids emulating the missing double word
instructions on older instruction sets.

Like with the previous code for 16-bit samples this has been tested on
an Athlon64 and a Core2Quad.

Athlon64:
1809275 decicycles in C,    32718 runs, 50 skips
 911675 decicycles in mmx,  32727 runs, 41 skips, 2.0x faster
 495284 decicycles in sse2, 32747 runs, 21 skips, 3.7x faster

Core2Quad:
 921363 decicycles in C,     32756 runs, 12 skips
 486537 decicycles in mmx,   32764 runs,  4 skips, 1.9x faster
 293296 decicycles in sse2,  32759 runs,  9 skips, 3.1x faster
 284910 decicycles in ssse3, 32759 runs,  9 skips, 3.2x faster
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This is a fairly dumb copy of the assembly for 8-bit samples but it
works and produces identical output to the C version.  The options have
been tested on an Athlon64 and a Core2Quad.

Athlon64:
1810385 decicycles in C,    32726 runs, 42 skips
1080744 decicycles in mmx,  32744 runs, 24 skips, 1.7x faster
 818315 decicycles in sse2, 32735 runs, 33 skips, 2.2x faster

Core2Quad:
 924025 decicycles in C,     32750 runs, 18 skips
 623995 decicycles in mmx,   32767 runs,  1 skips, 1.5x faster
 406223 decicycles in sse2,  32764 runs,  4 skips, 2.3x faster
 387842 decicycles in ssse3, 32767 runs,  1 skips, 2.4x faster
 307726 decicycles in sse4,  32763 runs,  5 skips, 3.0x faster
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Reconfiguring can break x264 lossless encoding.

Fixes ticket #2165.

Since lavfi works natively with AVFrame now, these functions are no longer
necessary and can be removed in a future bump.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

* qatar/master:
  af_join: do not leak input frames.
  asrc_anullsrc: return EOF, not -1

Conflicts:
	libavfilter/asrc_anullsrc.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'f4281f45':
  asrc_anullsrc: do not set samplerate and channel layout explicitly

Conflicts:
	libavfilter/asrc_anullsrc.c

No change to FFmpeg due to semantic difference between the filter sources
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'e4a7b217':
  vf_showinfo: remove its useless init function
  AVOptions: fix using named constants with child contexts.

Conflicts:
	libavutil/opt.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '9676b9a2':
  AVOption: remove an unused function parameter.
  filters.texi: restore mistakenly removed section name for noformat
  avfiltergraph: use sizeof(var) instead of sizeof(type)
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '42c7c61a':
  avfiltergraph: replace AVFilterGraph.filter_count with nb_filters

Conflicts:
	doc/APIchanges
	libavfilter/avfiltergraph.c
	libavfilter/avfiltergraph.h
	libavfilter/graphparser.c
	libavfilter/version.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '556aab8f':
  lavfi: use designated initializers in avfilter_class

Conflicts:
	libavfilter/avfilter.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'aa3c7799':
  lavf: sanity check size in av_get/append_packet().

Conflicts:
	libavformat/utils.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'ca6c3f2c':
  lzo: fix overflow checking in copy_backptr()
  flacdec: simplify bounds checking in flac_probe()
  atrac3: avoid oversized shifting in decode_bytes()

Conflicts:
	libavformat/flacdec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

This is admittedly kind of pointless since usually -f image2pipe
can be used for the purpose, but this is more user-friendly.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

Otherwise ffmpeg -formats claims that we only support demuxing
of that format.
To keep compatibility the struct could be duplicated instead,
but this seems almost like overkill for such a rare format.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

- Make MultiByteToWideChar fail when it encounters invalid encoding.
  Without this, invalid characters might just be skipped
- When MultiByteToWideChar fails, assume the file name is in CP_ACP
  and open it via normal open function, even when the file will be
  written
- When malloc fails return error instead of crashing
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

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

They are auto-negotiated.

Filter private data is memset to 0 so there is no point in explicitly
initing anything to 0.

The named constant needs to be searched for in the same object on which
the option is set, i.e. target_obj.