aarch64: add darwin style PAGE/PAGEOFF relocations
aarch64: remove optional :pg_hi21: for adrp instruction

Clang's integrated assembler does not support it.
aarch64: use '#' for whole line asm comments

Both gnu as and clang treat lines starting with '#' as comments if they
aren't consumed by the C-style preprocessor.
Using '//' does not work with clang since comments are removed before
macro expansion.
arm: check if AS supports .dn

Move the GNU as check before the arch specific asm checks since the .dn
check requires gas compatible assembler.

Disable the VC-1 motion compensation NEON asm which is the only part
using that directive. The integrated assembler in the upcoming clang 3.5
does not support .dn/.qn without plans to change that. Too much effort
to implement it while it is rarely used.

http://llvm.org/bugs/show_bug.cgi?id=18199.
build: check if AS supports the '.func' directive

Not supported by Clang's integrated assembler. Since it just adds
debug information it can safely omitted.
oggenc: Support flushing the muxer

This allows the caller to write all buffered data to disk, allowing
the caller to know at what byte position in the file a certain
packet starts (any packet written after the flush will be located
after that byte position).

Signed-off-by: Martin Storsjö <martin@martin.st>
avconv: Report the codec and the encoder separately

Bug-Id: 694
dict: const correctness for av_dict_get() and av_dict_copy()
mov: Export geotag metadata fields

The '?xyz' form is used by android devices (and according to apple
mailing list archives, also by older iOS devices). The 'loci' field
(defined in 3GPP 26.244) is used by recent iOS devices.

Even though the loci field can contain an altitude, it was plain
0 in my sample. Just export longitude and latitude, in a string
format matching the one used by the '?xyz' metadata field.

Signed-off-by: Martin Storsjö <martin@martin.st>
libfdk-aac: Relicense the library wrappers to the ISC license

This reduces the number of different licenses used within libav,
and is preferrable since it has less ambiguous wordings than
the BSD license with respect to the duties of the user of the code.

Fraunhofer have now indicated that they're allowed to contribute
code under this license as well.

Signed-off-by: Martin Storsjö <martin@martin.st>
mpeg2: add sequence display extension information

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
avcodec options: add enum option for color_primaries

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
avcodec options: add enum option for color_trc

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
avcodec options: add enum option for colorspace

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
avcodec options: add enum option for color_range

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>