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Do not declare *_sys_t typedefs globally in vlc_common.h. Instead,
declare them locally in each module that provides a definition.

This paves the way to move C++ definitions into anonymous namespaces in
order to respect C++ ODR.

The picture_resource_t and sout_stream_id_sys_t typedefs will be handled
separately, since they require specific additional changes.

See #18033
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

See #17078
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

fixes regression in ts module to handle streams with proper
discontinuityies

A combined access-demux cannot be instantiated without an ES output.
This checks that the ES output is present, avoiding crashes for
instance with vlc_stream_NewURL().

For the time being, access_demux modules should have a higher priority
than access modules, so that order is maintained if/when the two
capabilities are merged. The highest access module priority is below
300 as of now.

This stems from the conversion of ES category to an enumerated type.

In order to avoid confusion with future vlc_alloc.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Regression from 740dd861

no guarantee ts will set id it to pid

Note: this can't prevent all other issues due
to stream_demux

It will never be NULL for access & access_demux, but can be
for demux_filter. However, these modules aren't demux_filter

 - use size_t, ssize_t,
 - handle const types where applicable.