* modules/audio_filter/channel_mixer/trivial.c: Fixed reverse stereo mode
  with MPEG files,
* src/audio_output/output.c: Fixed dual-mono handling.

* Fixed bugs regarding Dolby Surround downmixing.

* src/audio_output/output.c: don't forget to free the audio buffer when
we are trashing it.

  warnings than real ones.
* audio output: New intf-change variable to know when audio-channels
  and audio-device have changed.
* video output: New intf-change variable and vout_VarCallback, to know
  when video-device has changed (OS X port).
* modules/gui/macosx/*: Menus for audio channels, implemented volume
  management, added a menu for screen selection.

* ALL: a few updates to the variables API:
  - got rid of the VLC_VAR_COMMAND variable type and introduced the VLC_VAR_ISCOMMAND flag
instead. This simplifies things and avoid the strange command variables behaviour. Command
variables will now trigger their callback on var_Set() like any other variables (look in
modules/control/rc/rc.c for an example).
  - Renamed the VLC_VAR_ISLIST flag into VLC_VAR_HASCHOICE.
  - Added a new VLC_VAR_VOID variable type. This can be useful in conjunction with
VLC_VAR_ISCOMMAND for instance.

    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.

* src/audio_output/output.c: fixed another quality affecting bug.

* include/aout_internal.h src/audio_output/input.c: major change to the
   resampling algorithm. When resampling is requested to keep the audio stream
   synchronised to the main clock, we trigger it but we change the resampling
   rate only progressively so it doesn't get noticed too much by the listener.

* ALL: using "%ll" in printf format strings is not portable (notably on win32) so
   we now use the I64Fx familly of macros to print 64 bits numbers (x being
   replaced by d,i,o,u,x or X).
   eg: msg_Dbg( p_this, "sample is "I64Fi" late", ll_time );

* src/misc/messages.c: got rid of ConvertPrintfFormatString().

* src/audio_output/common.c, include/aout_internal.h: added a new function
   aout_FifoFirstDate() that allows the aout plugin to schedule the first
   play.
* src/audio_output/output.c: fixed another problem affecting the audio quality.
* modules/audio_output/directx.c: improvements. The buffering scheme has been
   changed to be less affected by temporary starving. We also schedule the first   sample to play.

* modules/codec/spudec/spudec.c, modules/codec/spudec/parse.c: fixed a couple
   of problems introduced with the recent changes to the bitstream facility.
* src/audio_output/output.c: fixed a quite annoying bug in aout3 that was
   triggering unnecessary trashing of audio frames.

  messages,
* Updated BeOS and QNX outputs with respect to i_channels policy.

* include/vlc_threads.h: Avoid locking the interface,
* ALL: reworked all audio output plug-ins to correctly take into account
  i_channels. At present this is known to break OSS, probably others.

    locales breakage.
  * ./src/libvlc.c: libvlc understands the VLC_VERBOSE environment variable,
    to be set between 0 and 4. Default value is 0 for a program using libvlc,
    but vlc sets it to 1 by default.
  * ./src/misc/configuration.c: -v now works the old way (-v, -vv, -vvv) as
    well as the new way (-v0, -v1, -v4). -v1 is the same as -v, and -v0 is
    the same as -q (quiet). Hope it's all understandable.

new ones.

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

pf_setformat disappears (it was never called independantly of Open). If
the format needs to be changed, we will have Close/Open. This is much
simpler than before. Please check that I didn't break some plug-ins.

  (see my last mail).
* aout: Rewrote our whole lock policy. The output thread now doesn't require
  the mixer_lock, which might avoid delays. We will also be able to change
  the filter pipelines at runtime.

    sound synchronization.
  * ./src/audio_output/output.c: reverted another change I previously did :-)

    prototype change; it looks like we won't need it after all.
  * ./src/audio_output/output.c: if audio output is too slow, but we
    know there is no next packet, then we play it anyway. Rationale behind
    this is: better play a slightly wrongly dated packet than play silence,
    because it might be wrongly dated but there are chances it won't break
    audio continuity.
  * ./modules/audio_output/sdl.c: workaround for SDL's crap audio output
    system (callback gets called at random times, and no way to know the
    latency of the samples being played). Audio output is now rather good
    here, but please give feedback.
  * ./modules/audio_output/oss.c: we delay a bit before asking for a new
    buffer to avoid starvation.

    which lets the audio output module give a timeout value for buffer
    delivery. This fixes a few issues with aout modules which were calling
    aout_OutputNextBuffer way too early.

* Audio and video should now _always_ be perfectly in sync.
* Changes in a52.c (end_date management) must be ported to other codecs,
  otherwise mixer errors will appear.
* Audio output plug-in can now tell whether they can handle a little
  clock drift (for instance, inserting zeroes after a pause).

pause/play and change of audio channel.

* Major changes in the handling of dates in the audio output ; still buggy,
but differently.
* Fixed a major bug in the aout pre-filters, preventing to run any other
decoder than liba52.
* p_aout->output.pf_play now has only one argument.

  received does not start exactly at the given date, it indicates if the
  output plug-in is able to compensate for the drift (for instance on
  startup, or with S/PDIF packets), or if we need the aout core to
  resample the coming buffers. It is currently unimplemented.

  p_buffer now has a i_nb_bytes member. It is possible to indicate for a
  format its byterate (necessary for AC3 and SPDIF).
* S/PDIF output seems to be working at last (tested with the file output).

* Prepared for some advances in the aout3 clock management.
* Added the first stone of the forthcoming stream output.

* Begun writing some hooks for forthcoming S/PDIF support
* ./modules/access/vcd/cdrom.c: compile fix for Darwin