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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.

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))

- Fix a bunch of abuse of strncmp (memcmp rulez)

* Headers in include must contain the structures and prototypes needed
  by the plugins and should be named vlc_*.
* Headers in include/vlc must contain the structures and prototypes
  needed by external libvlc clients

* Moved and renamed some things in headers. 
   - Removed vlc_cpu.h, vlc_error.h (merged in vlc_common)
   - Removed snapshot.h (merged in vlc_vout.h)
   - Removed vlc_spu.h (merged in vlc_osd.h)
   - Removed intf_eject.h and vlc_interaction.h (merged in vlc_interface)
   - Moved all internal headers to src
   - Merged vlc_video.h and video_output.h and move private things to src
   - Removed vlc/intf.h, vlc/aout.h, vlc/vout.h, vlc/decoder.h and vlc/input.h
     (meta headers for use in modules, and often implying too large 
     dependencies)
* Removed some useless dependencies
* Unexported a bunch of functions and structures used only in src/
  (--> Still some work here)
* Finally made input_thread_t and input_source_t (mostly) private. 
  Added input_GetItem to fetch the input_item of an input_thread
* Cleaned up deprecated entries in vlc_symbols.h and bumped up symbol 
  prefix

This commit has a 99% probability of breaking the build, 0.1% of killing
your cat and 0% of getting you hot chicks.

* malloc with NULL check
* file extension check
* check if a demux was forced
* try peeking, and check what we poke
* init standard demuxer fields
* create packetizers

ogg.c : FIXME FIXME FIXME
I don't know Ogg format well, but don't we have a possible out-of-bound
read at line 1346 and following ??

(da big courmischage)

* Each module can declare a "human-readable short name" with set_name
* Modules are sorted by category (set_category, set_subcategory).
  Modules configs can be separated by set_section()
* Separated audio-filter and audio-visual
* Separated extraintf and control
* New command and widget : add_module_list() for comma-separated modules
* Vfilters now use "," as separator

implemented _only_ when it has a high precision.

* ALL: changed the prototype of module_Need() to accept a "strict" boolean argument.
If "strict" is true and a module name is provided then module_Need() will only look for the specified module
If "strict" is false, then module_Need() will first look for the specified module and if it wasn't found, will continue with the other modules with the same "capability".

 to demux2.

 field and a few BLOCK_FLAG_*.

* modules/demux/dts.c: improved detection of wav dts files.

* modules/demux/dts.c: more fixes.

* modules/video_output/directx/directx.c: fixed the "refresh" button for the --directx-device option.
* modules/demux/dts.c: implemented DEMUX_GET_TIME and DEMUX_GET_LENGTH.
* modules/access/cdda.c: got rid of the cdda demux and add a wav header at the beginning of the data.
   This allows to correctly support DTS audio cd (demux will detect what kind of CD it is).
* modules/demux/wav.c: code cleanup and fixed seeking.

* modules/demux/dts.c: should detect DTS wav files even if the data doesn't start with a DTS frame.

* modules/demux/dts.c: added detection for 14bits big endian and 16bits little endian bitstreams.
   (we still assume that the stream must begin with a new DTS frame, which doesn't always seem to be the case).

* modules/demux/dts.c: support for DTS WAV files.
* modules/codec/dts.c: support for 14bits little endian DTS bitstreams.

* ALL: fixed DTS audio support.
* modules/demux/dts.c: added raw DTS audio demuxer.

* modules/codec/flac.c: added a FLAC encoder.
* modules/mux/dummy.c, modules/mux/ogg.c: you can output "normal" flac streams with the es/dummy muxer or output them with an Ogg container.

* modules/codec/flac.c: complete rewrite of the flac decoder + new packetizer.
* modules/demux/flac.c: rewrite of the flac demuxer which makes use of the flac packetizer.

 is a generic handler)
 * avi, mp4 : begin to implement a specific pf_demux_control.

* modules/demux/flac.c: few cosmetic changes.
* modules/codec/flacdec.c: when synchronisation on the bitstream is lost, flush the flac decoder so it can synchronise again (fixes problems on seeking).

* ALL: changed the prototype of input_AddES() to include enough information so we can build an "video-es", "audio-es" and "spu-es" object variable. These variables can be used by the interfaces to navigate between the elementary streams.
* modules/gui/wxwindows/menus.cpp: use the "foo-es" object variables.

* ALL: i18n updates and fixes.

16bit per sample streams, only tested with stereo

* Reactivated the A/52 demux.
* Wrote a real full-featured float32 mixer.

    waveout, directx, qnx, beos, win32, macosx, and the AltiVec modules.
  * ALL: removed mention of AC3 in favour of A52.
  * ./configure.in, ./Makefile*: modules can now be built deeper than 1
    directory. As a consequence, the build is even slower (but I'm fixing
    this) and make clean doesn't work anymore.

    about 2000 lines of code.

    I could not test everything on every architecture, so please report
    any module breakage (especially on BeOS, OSX and QNX).