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A lot of playlist probe only check the file extension that returns true for a
directory too.

Re-license almost all the playback modules to LGPLv2.1+ with
authorization from their respective contributors (230+)

This includes:
 - access, codec, packetizers, demux
 - audio filters, audio mixers, audio output
 - video filters, video chroma, video output
 - text renderers
 - XML parser
 - ARM NEON and SSE2 optimisations (mostly for chromas and filters)

Some modules are not concerned:
 - BDA and DShow access modules because Manol Manolov is AWOL
 - Real RTSP, because it is derived from Xine
 - x264 and t140 because they are encoders only
 - DLL Loader, because it is derived from MPlayer
 - DTS packetizer, because Jon Lech Johansen is AWOL
 - Shine and WMAfixed, because they are derived from Rockbox
 - Real demuxer, as it is derived from MPlayer and Wang Bo is AWOL
 - MPC demuxer, as Yavor Doganov is AWOL
 - Tivo demuxer, because it is derived from an MPlayer fork
 - Playlist demuxer, (WPL and ZPL parts missing), because suheaven is AWOL
 - iOS audio output and video display, because author refuses the license change
 - Equalizer and compressor, because Ronald Wright is AWOL
 - Mono, Headphone and Dolby, because author refuses the license change
 - hqdn3d and yadif, because they are from MPlayer/libavfilter
 - remoteosd, because it derives from RealVNC code
 - MMX optimisations, because Ollie Lho, from SiS, is AWOL
 - Rotate, because it depends on GPL motion

Nota Bene:
 - Some modules depend on GPL-only libraries, a LGPL module does not mean
   that the resulting binary module will be LGPL.
   Libraries affected would include liba52, libdvdcss, libdvdnav, libdvdread,
   faad2, libdca, libmad, libmpeg2, libpostproc, SRC, sid, zvbi and probably others.

 - add support for DVB-S and ATSC
 - add new parameter values
 - fix code rates for DVB-T ("fec" != "code-rate-{h,l}p")

This reverts commit 3cb4988a.

Conflicts:

	modules/demux/playlist/dvb.c

input_item: compress two functions into one and rename "Add" into "Post" for clarity and consistency

input_item: Remove input_item_AddSubItem2 and send subitem_added event from input_item_node_AppendNode().

This means that we don't need input_item_AddSubItem if there is an input_item_node_Append*().
input_item_AddSubItem now send the subitem_tree_added event as well.

It previously assumed TRUSTED.
No functionnal/security changes in this commit.

 This will force people to use VLC_INPUT_OPTION_TRUSTED flag when they
need it and ease security review.
 This commit has no functionnal/security changes.

Without this I needed to give --dvb-srate=6875000 to vlc with
channels.conf file for it to work proberly, please review that it
doesn't cause any funky issues to other than dvb-c stuff.

Signed-off-by: Rémi Denis-Courmont <rdenis@simphalempin.com>

This improves readability a lot and prevent us from reinventing the wheel.

Missing some cases that I could not test.
Also ffmpeg/chroma.c is locked, so I can but leave it broken.
Fix is for the remaining modules is obvious and the issue is easy to detect.

You can not change a playlist_item_t to be a node, when you previously registered events on it, using input_item_t sub items adding event, because the pointer will be destroyed.
If you want to use nodes anyway, you have to explicitely create them.
Note: we were lucky that xspf did work so far, because we were EXCLUSIVELY using invalid pointers, except for the 1st item being added to each playlist_item_t (it did happen before the conversion obviously).

playlist demuxers: return -1 in case of error, 0 in case of eof, 1 else; like any correct demuxer. (we always return eof since playlists don't need 2 successive demuxing).
fix a corner case bug in ifo.c

Made demux2_IsPathExtension case insensitive.
Used demux2_IsPathExtension/p_demux->b_force when appropriate
Fixed a regression in flac demuxer (segfault when reading meta data)
Added a VLC_UNUSED(x) macro to avoid seeing ugly (void)x around the code.
Improved a bit a few vlc_common.h macro (do {} while(0))

	Use decoder_GetInputAttachment to get attachment from a decoder module.
    You need to release the memory with vlc_input_attachment_Delete.
	Untested...

modules/playlist/* cosmetic.