doc: Fit the graph in 80 cols

Some man pagers do not reflow the text/graphs on resize
and the graphs did not fit the traditional 80cols due
the pod2man excessive indent.
dict: const pointers to dictionary where possible

This avoids temporaries or ugly casting in the calling code where
const dictionaries are used. Esp. helpful when writing C++ wrappers
for an AVDictionary having const member functions and CTORs with const
references.

Signed-off-by: Roman Fietze <roman.fietze@telemotive.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
libavformat/utils.c: av_pkt_dump_log2: use const pointers

Use const pointers to AVPacket and AVStream.

Signed-off-by: Roman Fietze <roman.fietze@telemotive.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter.h, buffer.c: use const src pointer in avfilter_copy_buffer_ref_props

Signed-off-by: Roman Fietze <roman.fietze@telemotive.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
log: Support for 256color terminals

And provide extended coloring capabilities for debugging.
The default colors do not change in 256 more to keep
supporting people using Black on White, White on Black and
Solarized terminals.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Merge commit 'lukaszmluki/master^'

* commit 'lukaszmluki/master^':
  lavu/opt: extend AVOptionRange by extra values

Merged-by: Michael Niedermayer <michaelni@gmx.at>
log: Remove undefined behaviour
log: Document AV_LOG_C usage

And move outside the wrong doxygen group.
log: Do not assume the TERM variable is always set
lavu/opt: dont crash on freeing NULL AVOptionRanges

Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '006c253346d90f4abaf69d78083c8ba031628598'

* commit '006c253346d90f4abaf69d78083c8ba031628598':
  doc: Fit the graph in 80 cols

Merged-by: Michael Niedermayer <michaelni@gmx.at>
doc/ffmpeg: restore ascii arrows in Simple filtergraphs

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
log: Factorize check_color_terminal() out
Merge commit '7763118cae4eb468b032dbd29af15a011c2c233b'

* commit '7763118cae4eb468b032dbd29af15a011c2c233b':
  log: Support for 256color terminals

Conflicts:
	doc/APIchanges
	libavutil/log.c
	libavutil/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '28b9ac4e48f3405a82e8e87ead336188215cf1e6'

* commit '28b9ac4e48f3405a82e8e87ead336188215cf1e6':
  log: Remove undefined behaviour

Conflicts:
	libavutil/log.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '42ba1c51d9e843135772a3b9e5cf036a37b28bdb'

* commit '42ba1c51d9e843135772a3b9e5cf036a37b28bdb':
  log: Document AV_LOG_C usage

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  log: Do not assume the TERM variable is always set

Conflicts:
	libavutil/log.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avutil/log: add code to test av_log()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/log: fix negative log levels

These where broken by 7763118cae4eb468b032dbd29af15a011c2c233b

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/log: remove stray ;

regression since  5a18b215f7138c0bd59f27389050b0311fa4a549

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