[vlc-devel] [RFC 0/2] Player info to replace module tree

[Romain Vimont]

The purpose is to build and maintain a structure representing the modules used
for the current playback, to replace the module tree which has been removed
(trac #21997).

It will contain info about:
 - input sources
 - stream/demux/access
 - decoder
 - aout
 - vout
 - ...

To show how it could work, I implemented a player info for input sources and
their stream/demux/access (patch 1).

When a change occurs, a specific input event (with type INPUT_EVENT_INFO) is
sent. The player receives this event and (delegates to vlc_player_info which)
updates the info structure, and notify listeners.

To show how it is used, I implemented a listener from the Qt module (patch 2).
For now, it just print logs.

For example, I have to files:
 - big_buck_bunny.mp4
 - big_buck_bunny.srt (a fake subtitle track)

When I open big_buck_bunny.mp4, it prints:

    [PI] --> on_source_added
    [PI INPUT]
      [PI SOURCE 0]
        [PI STREAM 0]: MP4 stream demuxer (MP4): file:///home/rom/Vid%C3%A9os/big_buck_bunny.mp4
        [PI STREAM 1]: Internal stream record (record): file:///home/rom/Vid%C3%A9os/big_buck_bunny.mp4
        [PI STREAM 2]: Byte stream cache (cache_read): file:///home/rom/Vid%C3%A9os/big_buck_bunny.mp4
        [PI STREAM 3]: (null) ((null)): file:///home/rom/Vid%C3%A9os/big_buck_bunny.mp4
    [PI] --> on_source_added
    [PI INPUT]
      [PI SOURCE 0]
        [PI STREAM 0]: MP4 stream demuxer (MP4): file:///home/rom/Vid%C3%A9os/big_buck_bunny.mp4
        [PI STREAM 1]: Internal stream record (record): file:///home/rom/Vid%C3%A9os/big_buck_bunny.mp4
        [PI STREAM 2]: Byte stream cache (cache_read): file:///home/rom/Vid%C3%A9os/big_buck_bunny.mp4
        [PI STREAM 3]: (null) ((null)): file:///home/rom/Vid%C3%A9os/big_buck_bunny.mp4
      [PI SOURCE 1]
        [PI STREAM 0]: Text subtitle parser (Subtitles): file:///home/rom/Vid%C3%A9os/big_buck_bunny.srt
        [PI STREAM 1]: Internal stream record (record): file:///home/rom/Vid%C3%A9os/big_buck_bunny.srt
        [PI STREAM 2]: Byte stream cache (cache_read): file:///home/rom/Vid%C3%A9os/big_buck_bunny.srt
        [PI STREAM 3]: (null) ((null)): file:///home/rom/Vid%C3%A9os/big_buck_bunny.srt

(The goal is to update the UI instead of printing logs.)

What do you think?

Thank you for your feedbacks.

Romain Vimont (2):
  player info
  listen player info from Qt module

 include/vlc_player.h       |   3 +
 include/vlc_player_info.h  |  78 +++++++++
 modules/gui/qt/qt.cpp      |  67 ++++++++
 modules/gui/qt/qt.hpp      |   1 +
 src/Makefile.am            |   3 +
 src/input/demux.c          |   6 +
 src/input/demux.h          |   2 +
 src/input/event.h          |  12 +-
 src/input/input.c          |  17 ++
 src/input/input_internal.h |   9 +-
 src/input/player.c         |  20 +++
 src/input/player_info.c    | 337 +++++++++++++++++++++++++++++++++++++
 src/input/player_info.h    |  77 +++++++++
 src/libvlccore.sym         |  11 ++
 14 files changed, 641 insertions(+), 2 deletions(-)
 create mode 100644 include/vlc_player_info.h
 create mode 100644 src/input/player_info.c
 create mode 100644 src/input/player_info.h

-- 
2.20.1