Without this exception files with ".gif" extension by default
recognized as input suitable for image2 demuxer rather than gif.
In order to pass image through gif demuxer it was necessary
to use -f gif option.
This change affected 'make fate' test results because previously
image2 demuxer and gif decoder took only first frame of multiframe
test data, which is no longer true with gif demuxer.
Signed-off-by: Vitaliy E Sugrobov <vsugrob@hotmail.com>

Gif demuxer is capable of extracting multiple frames from gif file.
In conjunction with gif decoder it implements support for reading
animated gifs.
Demuxer has two options available to user: default_delay and min_delay.
These options are for protection from too rapid gif animations. In practice
it is standard approach to slow down rendering of this kind of gifs. If you try to
play gif with delay between frames of one hundredth of second (100fps) using
one of major web browsers, you get significantly slower playback,
around 10 fps. This is because browser detects that delay value is less than some
threshold (usually 2 hundredths of second) and reset it to default value (usually 10
hundredths of second, which corresponds to 10fps). Manipulating these options user
can achieve the same effect during conversion to some video format. Otherwise user
can set them to not protect from rapid animations at all.
The other case when these options necessary is for gif images encoded according to
gif87a standard since prior to gif89a there was no delay information included in file.
Bump lavf minor version.
Signed-off-by: Vitaliy E Sugrobov <vsugrob@hotmail.com>

Share them with upcoming demuxer module.
Signed-off-by: Vitaliy E Sugrobov <vsugrob@hotmail.com>

Check for availability of some required amount of bytes in buffer before
reading further.
Signed-off-by: Vitaliy E Sugrobov <vsugrob@hotmail.com>

Add capability of reading multiple frames instead of only first.
Implement support for different gif frame 'disposal methods'.
Add option that allows to change background color resulting from
conversion of gif with transparency to any other format which
not support it.
Also bump lavc minor version.
Signed-off-by: Vitaliy E Sugrobov <vsugrob@hotmail.com>

Replace literals with named constants in several pieces of code
like 'return -1' and 'case 0xab'.
Change the way decoder handles absence of image data in a file:
notify gif_decode_frame() caller with got_picture set to zero
instead of returning -1.
Signed-off-by: Vitaliy E Sugrobov <vsugrob@hotmail.com>

* qatar/master:
  avutil: Include io.h with a separate condition from MapViewOfFile
  cmdutils: Use a configure check for enabling CommandLineToArgvW
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '9d46eaec':
  build: The FLAC encoder also depends on the flacdsp code
  img2: K&R formatting cosmetics
  h264: check context state before decoding slice data partitions
  flashsv: make sure data for zlib priming is available

Conflicts:
	libavcodec/Makefile
	libavformat/img2.c
	libavformat/img2dec.c
	libavformat/img2enc.c
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>

Based on patch by Piotr Bandurski
Signed-off-by: Paul B Mahol <onemda@gmail.com>

Fixes ticket #1797.

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

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

This also fixes a long standing comment in the code.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Use the i64 field rather than the string value. Using a string to set a
default sample/pixel format is weird, also the new interface is more
consistent with the rest of the API.

This is technically an API break, but hopefully there are no applications
using this feature outside of FFmpeg. In order to save backward
compatibility with mixed libraries in case libavutil is updated but not
the other libraries, some ifdeffery hacks are added.

Note that the version check is only performed when class->version != 0,
since if it is not defined then we assume that no version was defined and
the class is not affected by the change.

We will luckily get rid of the hack at the next major bump.

Fixes null pointer dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

The existence of MapViewOfFile isn't linked to the existence of
io.h.

Not all versions of windows have MapViewOfFile (in particular,
Windows Phone 8 and the "metro" windows 8 API subset don't),
while they still have io.h (and need it for open/read/close).
Signed-off-by: Martin Storsjö <martin@martin.st>

This simplifies the condition to avoid hardcoding the systems
where the function exists. This also simplifies support for
newer Windows API subsets where this function doesn't exist,
such as Windows Phone 8 and the "metro" API subset of Windows 8.
Signed-off-by: Martin Storsjö <martin@martin.st>

Fixes linking with only the FLAC encoder enabled.

Also introduce local img_ namespace to simplify debugging.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes mov_h264_aac__Demo_FlagOfOurFathers.mov.SIGSEGV.4e9.656.

Found-by: Mateusz "j00ru" Jurczyk
CC: libav-stable@libav.org

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

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

* qatar/master:
  avplay: Do not use removed av_get_int()
  avconv: fix variable shadowing in configure_input_audio_filter()

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

* commit 'e4d349b4':
  fate: h264: Add dependencies
  fate: ea: Add dependencies
  fate: Do not unconditionally run libavutil tests
  rtpenc_chain: Remove unused variable
  nuv: check for malloc failure when allocating extradata
  nuv: use the stream indices generated by avformat_new_stream()

Conflicts:
	tests/fate/ea.mak
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Fixes a segfault in the fuzzed sample resolutionchange.flv_s314809.

CC: libav-stable@libav.org

* commit 'c74f8178':
  nuv: cosmetics: pretty-printing

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

* commit '5c7bf2dd':
  lavf: move nuv fourcc audio tags from riff to nuv
  lavf: add a common function for selecting a pcm codec from parameters

Conflicts:
	libavformat/internal.h
	libavformat/mov.c
	libavformat/riff.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'bfe5454c':
  lavf: move ff_codec_get_tag() and ff_codec_get_id() definitions to internal.h
  lavf: move "MP3 " fourcc from riff to nut
  fate: vpx: Add dependencies
  fate: Fix wavpack-matroskamode test dependencies
  x86: dsputilenc: port to cpuflags

Conflicts:
	libavformat/internal.h
	libavformat/nut.c
	tests/fate/vpx.mak
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '1f3f8965':
  fate: Add dependencies for Vorbis, ProRes, QTRLE, utvideo tests
  fate: real: Add dependencies
  fate: lossless-audio: Add dependencies
  x86: h264dsp: Fix linking with yasm and optimizations disabled

Conflicts:
	libavcodec/x86/h264dsp_init.c
	tests/fate/lossless-audio.mak
	tests/fate/real.mak
Merged-by: Michael Niedermayer <michaelni@gmx.at>