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So far, the input was attached after it inherited quite a bunch of
variables. This did not quite work. The problem lies in the dual use
of object attachment: variables inheritance and tree search.

Nowadays, the input object should not be looked for before it is
initialized. Only children objects use vlc_object_find anymore, and
they can only exist while the input is fully initialized. Other code
paths use playlist_CurrentInput() or such, which only ever return an
already initialized input (from input.c:Create()).

(N.B.: I wonder if there aren't similar issues in VOUT and AOUT)

Else, this results in triggering the timeshift module.

Introduce realloc_or_free() to src/*, and add assert() to mark unhandled ENOMEM error conditions. Allocation shrinking or otherwise handled allocations don't need realloc_or_free.

The execution of a seek command will be postpone until the decoder has finished
its bufferisation (or until 125ms has elapsed since the last seek).

core: create two variables at initialization (for var_AddCallback to get a higher chance to succeed!)

For the moment, it is only deactivated when using input_Read
and input_Preparse (it was making blocking vlc at start-up).

It is unused and not correctly implemented (!b_block case).

The pause must be done when the fifo of the decoder gets empty otherwise
the pause occurs too soon (especially with large caching).

It avoids to quit the pause state.

p_input->b_eof cannot be true at this stage.

Elliot Murphy authored Jul 27, 2009 and Rémi Denis-Courmont committed Sep 14, 2009

Added a new option, play-and-pause. When this option is set, the input thread is automatically paused when each item reaches the end of the file.

This option is intended to make it easier to use VLC during live
productions featuring instructors and speakers working
with American Sign Language (ASL), or really any Sign Language, where
it is common for a lecturer to refer to video clips during a
presentation. The automatic pausing provides a smooth pause for the
video operator to switch the projection system back to the camera
with the live speaker once a clip has finished playing.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

This try to avoid vlc_object_find() as much as possible.
This is conservative, because where there is no associated parent input, we'll try to find in certain cases the parent input. This will probably be
 removed later on. Because yes, there is not necessarily a parent input for access and demux, especially if created from stream_UrlNew().

Deeper code can cope with too overly large values.
We need to accept seemingly too far start times because the length is
typically not known at startup (and hence set to zero).

 It will allows to control the moment at which the meta are updated
to fix the delay introduced by timeshift and buffering.
 It will also simplify the way meta data are read by demuxers.

It would be the proper thing to do to convert real time access_demux
to work without pf_demux callback (it includes oss,alsa,rtp,screen
at least).

 It allows to decrease the number of input thread wakeup and to
improve its reactiveness at user commands in case of data starvation.