Hacker Guide/How To Write a Module

This guide is being written by a VLC media player novice. Please check all statements below.
Using dvdread.c as the template.

Module Descriptor

A VLC media player Module must include a description of itself, and the parameters it accepts.

The module descriptor begins with:

vlc_module_being();

You should set some category information on your module:

    set_shortname( _("DVD without menus") );
    set_description( _("DVDRead Input (DVD without menu support)") );
    set_category( CAT_INPUT );

Note the use of _("") to create a string that needs to be translated.

Predefined Categories include:

    set_subcategory( SUBCAT_INPUT_ACCESS );

See include/vlc_configuration.h for definition of all categories and sub-categories.

All macros take the following argument list:

 add_integer(name, value, p_callback, text, longtext, advc)

name is the string that identifies this parameter in the configuration. This name may be used at the command prompt to set the configuration value.
value is the default value for this parameter,
p_callback is a function pointer that will be called when the value of this parameter is changed.
- p_callback is called with the following arguments:
```
( p_this, psz_name, oldval, val, p_config->p_callback_data )
```
  - p_this is a pointer to a vlc_object_t struct,
  - psz_name is the name of your parameter that is being changed,
  - oldval is the old value of the parameter,
  - val is the new value of the parameter,
  - p_call_back_data is void* data that you can assign for each parameter. Usually NULL.
text A short description of the parameter,
longtext A complete description of the parameter,
advc Boolean, ADVanced Configuration. If TRUE, this parameter will only be displayed when using the --advanced flag. e.g.

vlc -p dvdread --advanced

e.g.

 add_integer("dvdread-angle", 1, NULL, "DVD Angle", "Default DVD Angle", NULL")

You may add the following parameters to your module:

For complete definitions, see include/vlc_configuration.h