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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>

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().

CID #1048724

Rename i_original_channels to i_chan_mode. For now, chan modes can be
DOLBYSTEREO or DUALMONO.

This new value, i_chan_mode, should only be set by demuxes/codecs/packetizers
if there is a special stereo mode to handle.

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

VLC_CODEC_RAW_PCM + 16 bits = VLC_CODEC_S16L
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

snprintf() always adds a nul terminator (unless the buffer has zero
bytes, obviously).

 * modules/access/linsys/*: add support for SDI and HD-SDI cards of
   Linear Systems/Computer Modules
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>