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.

the number of streams can change after we find the stream info

Set the options correctly in this case.
This happens with some .ts files for example.

bbcallen authored Jul 12, 2012 and Jean-Baptiste Kempf committed Jul 12, 2012

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

show the invalid options for the first stream only (following dictionaries are identical)
free all the options array

Obsolete "ffmpeg" prefix
Use "avformat" or "avcodec" prefix
avio has no options (yet)
switcher uses "sout-switcher" prefix
Use "sout-avformat" for muxer

Avoid repeating the same implementation several times:
 incorrectly (switcher and mux didn't lock)
 redundantly (avcodec_register_all can be called several times)

Move libavXXX init at the top of a few functions, just in case.

Check uses of vlc_avcodec_(un)lock and factorize

This simplifies the code, and allows resizing non-standard blocks.

Allocate avformat context and set its I/O context before using it
This is the correct way to it (and is documented in avformat.h)

- Use AVIOContext instead of ByteIOContext
- Use avformat_open_input instead of av_open_input_stream
- Use avio_alloc_context instead of init_put_byte, allocate context on the heap
- Use AVIOContext.seekable

print avformat_open_input errors

avformat_open_input is the most recent and is documented as available since
libavformat 53.2.0 (other changes happened in 52.105)
avformat_open_input was introduced in 52.94 in FFmpeg

print avformat_find_stream_info errors

Palette data is now transmitted as a side data in AVPacket

They were copied verbatim to AVDictionary equivalents some time ago

They were only used to hold one opaque pointer

Edward Wang authored Dec 15, 2011 and Jean-Baptiste Kempf committed Dec 15, 2011

Ref #4030

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Ref: #5204

Laurent Aimar authored Jun 07, 2011 and Jean-Baptiste Kempf committed Jun 07, 2011

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Suggested-by: elenril on #libav-devel

Konstantin Pavlov authored Apr 19, 2011 and Jean-Baptiste Kempf committed Apr 19, 2011

Tested on current libav and ffmpeg @ 25846 svn revision playback only.

No need to bump current lavc/lavf requirements (52.25.0 and 52.45.0), as
all the "new" functions used arrived earlier than abovementioned
versions were published.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>