commit 93681fbd
    Author: Ronald S. Bultje <rsbultje@gmail.com>
    Date:   Thu May 26 11:32:32 2011 -0400

        swscale: fix compile on ppc.

    commit e758573a
    Author: Ronald S. Bultje <rsbultje@gmail.com>
    Date:   Thu May 26 10:36:47 2011 -0400

        swscale: fix compile on x86-32.

    commit 0f4eb8b0
    Author: Ronald S. Bultje <rsbultje@gmail.com>
    Date:   Thu May 26 09:17:52 2011 -0400

        swscale: remove VOF/VOFW.

    commit b4a224c5
    Author: Ronald S. Bultje <rsbultje@gmail.com>
    Date:   Wed May 25 14:30:09 2011 -0400

        swscale: split chroma buffers into separate U/V planes.

        Preparatory step to implement support for sizes > VOFW.

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

Floating-Point-Only section was added after the video encoders chapter
in 034fc7bf merge.

This allows to convert between formats of arbitrary width,
regardless of the value of VOF/VOFW.

Avoid a failure with the default value of "NTSC". Not all drivers
support a standard.

Improve readability.

Also deprecate avcodec_get_pix_fmt_name() in its favor.

Make ff* tools only accept opt_* functions taking two arguments.

The distinction between functions with one and two arguments is quite
pointless. Simplify parse_options() code.

Many functions have such a prefix, but do not actually use any
instructions or features from that set, thus giving the false
impression that swscale is highly optimized for a particular
system, whereas in reality it is not.

Interleave macros and code so that it's easier to find the
actual code that belongs to a function. Also reindent where
appropriate and remove dead code.

This allows cutting up the function in much smaller and easier-
to-maintain chunks.

If that flag is set, swScale() already proxies the call to
yuv2rgbXinC_full(). Therefore, this flag is never set when
yuv2packed1() is called.

with minor addition to the comment by michael

with changes by michael to simplify API

* qatar/master: (29 commits)
  ARM: disable ff_vector_fmul_vfp on VFPv3 systems
  ARM: check for VFPv3
  swscale: Remove unused variables in x86 code.
  doc: Drop DJGPP section, Libav now compiles out-of-the-box on FreeDOS.
  x86: Add appropriate ifdefs around certain AVX functions.
  cmdutils: use sws_freeContext() instead of av_freep().
  swscale: delay allocation of formatConvBuffer().
  swscale: fix build with --disable-swscale-alpha.
  movenc: Deprecate the global RTP hinting flag, use a private AVOption instead
  movenc: Add an AVClass for setting muxer specific options
  swscale: fix non-bitexact yuv2yuv[X2]() MMX/MMX2 functions.
  configure: report yasm/nasm presence properly
  tcp: make connect() timeout properly
  rawdec: factor video demuxer definitions into a macro.
  rtspdec: add initial_pause private option.
  lavf: deprecate AVFormatParameters.width/height.
  tty: add video_size private option.
  rawdec: add video_size private option.
  x11grab: add video_size private option.
  x11grab: factorize returning error codes.
  ...
Merged-by: Michael Niedermayer <michaelni@gmx.at>

This function uses old-style vector operations deprecated in VFPv3.
Some implementations, e.g. Cortex-A9, support them only through
slow software emulation.  Cortex-A8 does have this functionality
in hardware, but as it also has NEON, this function is not used
there regardless.
Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

libswscale/x86/swscale_template.c:2072: warning: unused variable ‘canMMX2BeUsed’
libswscale/x86/swscale_template.c:2145: warning: unused variable ‘canMMX2BeUsed’
libswscale/x86/swscale_template.c:2209: warning: unused variable ‘chrVPixBuf’
libswscale/x86/swscale_template.c:2237: warning: unused variable ‘chrVSrcPtr’

nasm versions prior to 2.09 have trouble assembling some of our AVX code.
Protect these sections by preprocessor macros to allow compilation to pass.

av_freep(swsContext) will leak all memory potentially
allocated within the swsContext.

That means it won't be allocated when not needed. Alongside
this, it fixes valgrind/fate-detected memory leaks.

Instead of -fflags rtphint, set -movflags rtphint instead.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Versions >= 2.0 have been around for a very long time now.

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