rtpdec: Don't explicitly include unistd.h any longer

unistd.h used to be required for gethostname. On windows, gethostname
is provided by winsock2.h. Now network.h includes both unistd.h and
winsock2.h if they exist.

Signed-off-by: Martin Storsjö <martin@martin.st>
doc: Indicate that RTMPT is natively implemented in libavformat

Signed-off-by: Martin Storsjö <martin@martin.st>
random_seed: Only read /dev/*random if we have unistd.h

unistd.h is used for open/read/close, but if this header does not
exist, there's probably no use in trying to open /dev/*random
at all.

Signed-off-by: Martin Storsjö <martin@martin.st>
file: Only include unistd.h if it exists

It is included for the open/read/write/close functions. On
MSVC, where this header does not exist, the same functions
are provided by io.h, which is already included.

On windows, these functions are provided by io.h. Make sure
io.h is included if it exists, regardless of the setmode
function.

Signed-off-by: Martin Storsjö <martin@martin.st>
ffplay: split overly long line in audio_decode_frame()
ffplay: move assignment in else block in audio_decode_frame()

Avoid confusing and pointless double assignment of variable
resampled_data_size.
ffplay: vertially align complex if condition in audio_decode_frame()

Possibly improve readability.
ffplay: group together and vertically align correlated parameters in log function

Possibly improve readability.
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  file: Only include unistd.h if it exists
  random_seed: Only read /dev/*random if we have unistd.h
  doc: Indicate that RTMPT is natively implemented in libavformat
  rtpdec: Don't explicitly include unistd.h any longer

Conflicts:
	configure

Merged-by: Michael Niedermayer <michaelni@gmx.at>
x86: vc1: fix and enable optimised loop filter

The problem is that the ssse3 psign instruction does the wrong
thing here.  Commit ea60dfe incorrectly removed a macro emulating
this instruction for pre-ssse3 code.  However, the emulation is
incorrect, and the code relies on the behaviour of the macro.
Specifically, the psign sets destination elements to zero where
the corresponding source element is zero, whereas the emulation
only negates destination elements where the source is negative.

Furthermore, the PSIGNW_MMX macro in x86util.asm is totally bogus,
which is why the original VC-1 code had an additional right shift
when using it.  Since the psign instruction cannot be used here,
skip all the macro hell and use the working instruction sequence
directly.

None of this was noticed due a stray return statement in
ff_vc1dsp_init_mmx() which meant that only the mmx version of the
loop filter was ever used (before being removed in ea60dfe).

Signed-off-by: Mans Rullgard <mans@mansr.com>
swr: use __asm__ instead of __asm.

For consistency only.
swr: small align cosmetic.
swr: fix make checkheaders.
ffmpeg: fix parsing of -force_key_frames option.

Identical to commit 4f6a1c9 by Reimar Döffinger,
that was lost after the merge of 19ad567.
fate: add a test for the -force_key_frames option.

It broke twice in the last three months due to other changes.
lavfi: implement samples framing on links.

Links can be set up to group samples into buffers of
specified minimum and maximum size.
sink_buffer: implement fixed frame size.
ffmpeg: use the more powerful version of abuffersink.
os_support: Include all the necessary headers for the win32 open function

io.h is required for open and _wopen, and fcntl.h is required for
the O_CREAT flag. On mingw, fcntl.h is included by os_support.h (and
the mingw fcntl.h includes io.h), but include it explicitly here
since this implementation requires it.

Also move the #undef open up. open must not be defined to ff_win32_open
while including the headers that declare the open function. On mingw,
this happened in os_support.h before open was redirected.

Signed-off-by: Martin Storsjö <martin@martin.st>
os_support: Don't compare a negative number against socket descriptors

The fds are unsigned integers in the windows definition of struct
sockfds. Due to this, the comparison if (fds[i].fd > n) was always
false.

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