Allow to select sample rates.

"channels" is an int in all the other places in the libraries, and the
av_frame_*_channels() accessors return and set an int, so this should not
implicate ABI breaks.

This avoids per parameter changes in ffmpeg at the cost of making access
somewhat more annoying.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

This avoids user apps having to mangle dither scale. for pcm24
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

Based on
	commit 50f4337a
	Author: Justin Ruggles <justin.ruggles@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

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

Previously avctx->hwaccel would have been set to a dummy value,
now an explicit check is necessary instead.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

As the name indicates we can't just assume what the
"opaque" field contains.
This fixes a crash in third-party applications see e.g.:
http://bugzilla.mplayerhq.hu/show_bug.cgi?id=2126

This fixes also FFmpeg trac #2293, which is a different
third-party application.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

* qatar/master:
  configure: List external libs used using print_enabled()

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

* commit '3fc09b00':
  configure: Move list of external libs to a separate variable

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

* commit '45235ac4':
  configure: Move x11grab option to a more suitable place in the help output
  lavr: allow setting internal_sample_fmt option by string
  lavr: Add "resample_cutoff" option as a duplicate of "cutoff"

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

* commit '5c7db097':
  avconv: pass libavresample options to AVFilterGraph

Conflicts:
	cmdutils.c
	cmdutils.h
	ffmpeg_filter.c
	ffmpeg_opt.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '9f122356':
  lavfi: connect libavresample options to af_resample via AVFilterGraph

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

* commit 'd7c45043':
  ac3dec: validate channel output mode against channel count

Conflicts:
	libavcodec/ac3dec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

If you want it back (yeah i want it back too)
then you just need to volunteer to maintain the code in configure
thats related to hwaccel autodetection.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Conflicts:

	configure

* commit '82ca17ac':
  configure: Fix vaapi/vda/vdpau dependency declarations

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

* commit '215cdd35':
  configure: Refactor dxva2api.h dependency declarations

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

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

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

If there is unsupported subsampling encountered abort
early instead of failing decoding later.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

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

* commit '4cc4b33f':
  build: Add proper infrastructure for adding and checking host CPPFLAGS

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

* commit '2aac411f':
  configure: Simplify VDPAU header check

Conflicts:
	configure

Not merged as the code seems not to work
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '9840130e':
  configure: Simplify VDA header and extralibs check

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

* commit '0a8da1a3':
  configure: Do not redundantly list enabled hwaccel libs
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '7432e872':
  configure: Add print_3_columns helper function and use where appropriate
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '040c565e':
  doc: developer: Allow tabs in the vim configuration for Automake files
  Remove pointless av_cold attributes in header files

Conflicts:
	libavcodec/h264.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Using the table directly may cause problems on some platforms like msvc
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'b5f536d2':
  pnm: add high-bitdepth PGMYUV support for both encoder and decoder

Conflicts:
	libavcodec/pnm.c
	libavcodec/pnmdec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '2f325a6f':
  libx264: change i_qfactor to use x264cli's default
  qtrle: use AV_LOG_ERROR in an error message.

Conflicts:
	libavcodec/libx264.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '7b4f9115':
  qtrle: cosmetics, reformat CHECK_PIXEL_PTR() macro
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'e1065924':
  qtrle: add more checks against pixel_ptr being negative.

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

* commit '4f3b058c':
  cavs: initialize various context tables to 0
  mlpdec: do not try to allocate a zero-sized output buffer.
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '56daf10e':
  mov: use the format context for logging.
  flicvideo: avoid an infinite loop in byte run compression
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Useful for testing seek implementations.