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- This is needed for proper seek/pause/fast forward/...
- The decoder/packetizer do not need to scale packet length anymore as the
decoder thread do it.

It will avoid useless picture copy.

I removed:
 i_x/i_y: redondant with region i_x/i_y. Now a subpicture always represent the
 whole video.
 i_flags: unused anywhere in the core.

 I may have broken a few video filters (osdmenu mainly). I will fix it if you
report the problem and the way to reproduce it.

Sorry, I forgot 2 files.

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.

When no start display time is found in a subpicture then return with an error message. Problem reported by: Hytham Alihassan.

* 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.

subpicture_t now has a b_pausable attribute. When set to VLC_TRUE (default value is VLC_FALSE), this will keep displaying the subpicture_t when the parent input is paused. This means that subtitles should now be paused when clicking on pause. (refs #29)

    paved the way for private SPU commands.

(da big courmischage)

Aspect ration in subtitle means use underlying video aspect ratio.

WARNING: Since this parameter was ignored before probably there are a
number of image subtitle that have set this incorrectly. DVD's seemed
to be a case in point and that'd been fixed. Fixing other subtitles
should just be a matter of setting the i_aspect parameter correctly.

* 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

* modules/codec/spudec/*: automatic cropping of fullscreen subpictures (most of them contain large transparent areas).
* src/video_output/vout_subpictures.c: more correct cropping (cropping coordinates are relative to the video size, not subpicture size).
* include/vlc_es.h, modules/video_filter/blend.c: use the i_entries member of video_palette_t.
* include/vlc_common.h: added SetWBE()/SetDWBE()/SetQWBE() facility.

  (expect some breakage).
* modules/video_filter/blend.c: new alpha-blending module.

When you want to use OSD, you have to register an OSD channel, by calling
vout_RegisterOSDChannel, then pass it to vout_CreateSubPicture.
There is a particular channel, DEFAULT_CHANNEL that can be used for
general purpose.
See modules/control/hotkeys.c for an example.

* added i_channel and i_content properties to subpicture_t
* p_last_osd_message is no more used

An OSD channel can contain simultaneously an OSD text and an OSD widget.