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* 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.

Also, make it clearer what is shared and instance-specific

So,
libvlc_t ==> libvlc_global_t
vlc_t ==> libvlc_int_t (internal instance)

p_object->p_libvlc ==> p_object->p_libvlc_globale
p_object->p_vlc ==> p_object->p_libvlc

VLC_OBJECT_VLC ==> VLC_OBJECT_LIBVLC

And by the way, there is some cleanup required :) (ie, some things are created in the global object instead of the instance-specific one)

* Reduce vlc_object_find calls

(da big courmischage)

* ALL: final improvements to the decoders/packetizers api.
   (There are still a few decoders/packetizers left to be converted but this shouldn't take too long).
* ALL: small improvements to the encoders api.

* src/audio_output/dec.c: moved the audio desync option out of p_vlc so it can be modified on a per input basis.

* src/audio_output/*, src/input/*: fixed the audio desync option. You can use positive as well as negative values.

* src/audio_output/dec.c, include/aout_internal.h: the aout core was
automatically discarding audio samples that were above AOUT_MAX_ADVANCE_TIME
in the future. Problem is that p_input->i_pts_delay isn't a fixed value. We
now fetch this value from the input thread when we create an aout_instance_t.
This solves problems with the http access plugin.

  available.

* modules/codec/*: reverted my previous patch that explicitly set
i_bytes_per_frame and i_frame_length in each audio decoder.
* src/audio_output/dec.c: proper fix to correctly set i_bytes_per_frame
and i_frame_length.

* ALL: fixed a f*ckage I introduced recently ;) var_Type() now returns 0 when the variable
doesn't exist, but the rest of the code wasn't updated according to this new behaviour.
* modules/audio_output/waveout.c: changed a few error messages into warning messages.

    signed/unsigned comparisons, and removed trailing spaces here and there.

and is replaced by two members : i_physical_channels and i_original_channels.
i_physical_channels describes the channels which are effectively present
in the stream (at the current point of the aout pipeline), whereas
i_original_channels represents the channels we used to constitute the
stream. For instance a mono stream (FRONT_CENTER) may emanate from a
FRONT_LEFT channel of a STEREO stream.

Additionally, this contains hooks to dynamically select the audio device
and the channels configuration. In order to do that, all aout plugins,
and all interface plug-ins need to be adapted. Currently only SDL
(partially OSS) and the rc interface have been adapted, please use them
as a guide. Other aout plug-ins have been temporarily disabled.

IMPORTANT : if you need a working sound output, DO NOT UPDATE YOUR TREE
for several days until we fix that.

* modules/misc/network/ipv4.c: Fixed a long-standing segfault when saving
  preferences and asking for multicast.

* Fixed a compile issue in s16tofloat32swab.
* Fixed a typo in demux/mpeg/ts.c.