VLC流媒体播放器

Instructions to code your own VLC Lua scripts. $Id$ 1 - About Lua ============= Lua documentation is available on http://www.lua.org . The reference manual is very useful: http://www.lua.org/manual/5.1/ . VLC uses Lua 5.1 All the Lua standard libraries are available. 2 - Lua in VLC ============== Several types of VLC Lua scripts can currently be coded: * Playlist (see playlist/README.txt) * Art fetcher (see meta/README.txt) * Interface (see intf/README.txt) * Extensions (see extensions/README.txt) * Services Discovery (see sd/README.txt) Lua scripts are tried in alphabetical order in the user's VLC config directory lua/{playlist,meta,intf}/ subdirectory on Windows and Mac OS X or in the user's local share directory (~/.local/share/vlc/lua/... on linux), then in the global VLC lua/{playlist,meta,intf}/ directory. 3 - VLC specific Lua modules ============================ All VLC specifics modules are in the "vlc" object. For example, if you want to use the "info" function of the "msg" VLC specific Lua module: vlc.msg.info( "This is an info message and will be displayed in the console" ) Note: availability of the different VLC specific Lua modules depends on the type of VLC Lua script your are in. Access lists ------------ local a = vlc.acl(true) -> new ACL with default set to allow a:check("10.0.0.1") -> 0 == allow, 1 == deny, -1 == error a("10.0.0.1") -> same as a:check("10.0.0.1") a:duplicate() -> duplicate ACL object a:add_host("10.0.0.1",true) -> allow 10.0.0.1 a:add_net("10.0.0.0",24,true) -> allow 10.0.0.0/24 (not sure) a:load_file("/path/to/acl") -> load ACL from file Configuration ------------- config.get( name ): Get the VLC configuration option "name"'s value. config.set( name, value ): Set the VLC configuration option "name"'s value. Dialog ------ local d = vlc.dialog( "My VLC Extension" ): Create a new UI dialog, with a human-readable title: "My VLC Extension" d:show(): Show this dialog. d:hide(): Hide (but not close) this dialog. d:delete(): Close and delete this dialog. d:set_title( title ): set the title of this dialog. d:update(): Update the dialog immediately (don't wait for the current function to return) d:del_widget( widget ): Delete 'widget'. It disappears from the dialog and repositioning may occur. In the following functions, you can always add some optional parameters: col, row, col_span, row_span, width, height. They define the position of a widget in the dialog: - row, col are the absolute positions on a grid of widgets. First row, col are 1. - row_span, col_span represent the relative size of a widget on the grid. A widget with col_span = 4 will be displayed as wide as 4 widgets of col_span = 1. - width and height are size hints (in pixels) but may be discarded by the GUI module Example: w = d:add_label( "My Label", 2, 3, 4, 5 ) will create a label at row 3, col 2, with a relative width of 4, height of 5. d:add_button( text, func, ... ): Create a button with caption "text" (string). When clicked, call function "func". func is a function reference. d:add_label( text, ... ): Create a text label with caption "text" (string). d:add_html( text, ... ): Create a rich text label with caption "text" (string), that supports basic HTML formatting (such as <i> or <h1> for instance). d:add_text_input( text, ... ): Create an editable text field, in order to read user input. d:add_password( text, ... ): Create an editable text field, in order to read user input. Text entered in this box will not be readable (replaced by asterisks). d:add_check_box( text, ... ): Create a check box with a text. They have a boolean state (true/false). d:add_dropdown( ... ): Create a drop-down widget. Only 1 element can be selected the same time. d:add_list( ... ): Create a list widget. Allows multiple or empty selections. d:add_image( path, ... ): Create an image label. path is a relative or absolute path to the image on the local computer. Some functions can also be applied on widgets: w:set_text( text ): Change text displayed by the widget. Applies to: button, label, html, text_input, password, check_box. w:get_text(): Read text displayed by the widget. Returns a string. Applies to: button, label, html, text_input, password, check_box. w:set_checked( bool ): Set check state of a check box. Applies to: check_box. w:get_checked(): Read check state of a check box. Returns a boolean. Applies to: check_box. w:add_value( text, id ): Add a value with identifier 'id' (integer) and text 'text'. It's always best to have unique identifiers. Applies to: drop_down. w:get_value(): Return identifier of the selected item. Corresponds to the text value chosen by the user. Applies to: drop_down. w:clear(): Clear a list or drop_down widget. After that, all values previously added are lost. w:get_selection(): Retrieve a table representing the current selection. Keys are the ids, values are the texts associated. Applies to: list. Extension --------- deactivate(): Deactivate current extension (after the end of the current function). HTTPd ----- http( host, port, [cert, key, ca, crl]): create a new HTTP (SSL) daemon. local h = vlc.httpd( "localhost", 8080 ) h:handler( url, user, password, acl, callback, data ) -- add a handler for given url. If user and password are non nil, they will be used to authenticate connecting clients. If acl is non nil, it will be used to restrict access. callback will be called to handle connections. The callback function takes 7 arguments: data, url, request, type, in, addr, host. It returns the reply as a string. h:file( url, mime, user, password, acl, callback, data ) -- add a file for given url with given mime type. If user and password are non nil, they will be used to authenticate connecting clients. If acl is non nil, it will be used to restrict access. callback will be called to handle connections. The callback function takes 2 arguments: data and request. It returns the reply as a string. h:redirect( url_dst, url_src ): Redirect all connections from url_src to url_dst. Input ----- input.is_playing(): Return true if input exists. input.add_subtitle(url): Add a subtitle to the current input input.item(): Get the current input item. Input item methods are: :uri(): Get item's URI. :name(): Get item's name. :duration(): Get item's duration in seconds or negative value if unavailable. :is_preparsed(): Return true if meta data has been preparsed :metas(): Get meta data as a table. :set_meta(key, value): Set meta data. :info(): Get the current input's info. Return value is a table of tables. Keys of the top level table are info category labels. :stats(): Get statistics about the input. This is a table with the following fields: .read_packets .read_bytes .input_bitrate .average_input_bitrate .demux_read_packets .demux_read_bytes .demux_bitrate .average_demux_bitrate .demux_corrupted .demux_discontinuity .decoded_audio .decoded_video .displayed_pictures .lost_pictures .sent_packets .sent_bytes .send_bitrate .played_abuffers .lost_abuffers MD5 --- md5( str ): return the string's hash md5(): create an md5 object with the following methods: :add( str ): add a string to the hash :end_(): finish hashing :hash(): return the hash Messages -------- msg.dbg( [str1, [str2, [...]]] ): Output debug messages (-vv). msg.warn( [str1, [str2, [...]]] ): Output warning messages (-v). msg.err( [str1, [str2, [...]]] ): Output error messages. msg.info( [str1, [str2, [...]]] ): Output info messages. Misc ---- misc.version(): Get the VLC version string. misc.copyright(): Get the VLC copyright statement. misc.license(): Get the VLC license. misc.datadir(): Get the VLC data directory. misc.userdatadir(): Get the user's VLC data directory. misc.homedir(): Get the user's home directory. misc.configdi