1 - About Lua
=============
-Lua documenation is available on http://www.lua.org . The reference manual
-is very usefull: http://www.lua.org/manual/5.1/ .
+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
==============
-3 types of VLC Lua scripts can currently be coded:
+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
3 - VLC specific Lua modules
============================
-All VLC specifc modules are in the "vlc" object. For example, if you want
+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" )
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.
Input
-----
-input.info(): Get the current input's info. Return value is a table of tables. Keys of the top level table are info category labels.
input.is_playing(): Return true if input exists.
-input.get_title(): Get the input's name.
-input.stats(): Get statistics about the input. This is a table with the following fields:
+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
- .decoded_audio
- .played_abuffers
- .lost_abuffers
.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
--------
misc.cachedir(): Get the user's VLC cache directory.
misc.datadir_list( name ): FIXME: write description ... or ditch function
- if it isn't usefull anymore, we have datadir and userdatadir :)
+ if it isn't useful anymore, we have datadir and userdatadir :)
-misc.mdate(): Get the current date (in milliseconds).
-misc.mwait(): Wait for the given date (in milliseconds).
+misc.action_id( name ): get the id of the given action.
+
+misc.mdate(): Get the current date (in microseconds).
+misc.mwait(): Wait for the given date (in microseconds).
misc.lock_and_wait(): Lock our object thread and wait for a wake up signal.
fields "protocol", "username", "password", "host", "port", path" and
"option".
net.listen_tcp( host, port ): Listen to TCP connections. This returns an
- object with an accept and an fds method. The accept takes an optional timeout
- argument (in milliseconds). The fds method returns a list of fds you can call
- select on before using the accept method. For example:
+ object with an accept and an fds method. accept is blocking (Poll on the
+ fds with the net.POLLIN flag if you want to be non blocking).
+ The fds method returns a list of fds you can call poll on before using
+ the accept method. For example:
local l = vlc.net.listen_tcp( "localhost", 1234 )
while true do
- local fd = l:accept( 500 )
+ local fd = l:accept()
if fd >= 0 do
net.send( fd, "blabla" )
net.close( fd )
end
end
+net.connect_tcp( host, port ): open a connection to the given host:port (TCP).
net.close( fd ): Close file descriptor.
net.send( fd, string, [length] ): Send data on fd.
net.recv( fd, [max length] ): Receive data from fd.
net.poll( { fd = events }, [timeout in seconds] ): Implement poll function.
- Retruns the numbers of file descriptors with a non 0 revent. The function
+ Returns the numbers of file descriptors with a non 0 revent. The function
modifies the input table to { fd = revents }. See "man poll".
net.POLLIN/POLLPRI/POLLOUT/POLLRDHUP/POLLERR/POLLHUP/POLLNVAL: poll event flags
-net.select( nfds, fds_read, fds_write, timeout ): Monitor a bunch of file
- descriptors. Returns number of fds to handle. See "man select".
-net.fd_set_new(): Create a new fd_set.
-local fds = vlc.net.fd_set_new()
-fds:clr( fd ) -- remove fd from set
-fds:isset( fd ) -- check if fd is set
-fds:set( fd ) -- add fd to set
-fds:zero() -- clear the set
-net.fd_read( fd, [max length] ): Read data from fd.
-net.fd_write( fd, string, [length] ): Write data to fd.
+net.read( fd, [max length] ): Read data from fd.
+net.write( fd, string, [length] ): Write data to fd.
net.stat( path ): Stat a file. Returns a table with the following fields:
.type
.mode
osd.icon( type, [id] ): Display an icon on the given OSD channel. Uses the
default channel is none is given. Icon types are: "pause", "play",
"speaker" and "mute".
-osd.message( string, [id] ): Display text message on the given OSD channel.
+osd.message( string, [id], [position], [duration]: Display the text message on
+ the given OSD channel. Position types are: "center", "left", "right", "top",
+ "bottom", "top-left", "top-right", "bottom-left" or "bottom-right". The
+ duration is set in microseconds.
osd.slider( position, type, [id] ): Display slider. Position is an integer
from 0 to 100. Type can be "horizontal" or "vertical".
osd.channel_register(): Register a new OSD channel. Returns the channel id.
--------
playlist.prev(): Play previous track.
playlist.next(): Play next track.
-playlist.skip( n ): Skip n tracs.
+playlist.skip( n ): Skip n tracks.
playlist.play(): Play.
playlist.pause(): Pause.
playlist.stop(): Stop.
playlist.clear(): Clear the playlist.
playlist.repeat_( [status] ): Toggle item repeat or set to specified value.
playlist.loop( [status] ): Toggle playlist loop or set to specified value.
-playlist.random( [status] ): Toggle playlsit random or set to specified value.
+playlist.random( [status] ): Toggle playlist random or set to specified value.
playlist.goto( id ): Go to specified track.
playlist.add( ... ): Add a bunch of items to the playlist.
The playlist is a table of playlist objects.
example: .meta = { ["Google video"] = { ["docid"] = "-5784010886294950089"; ["GVP version"] = "1.1" }; ["misc"] = { "Hello" = "World!" } }
Invalid playlist items will be discarded by VLC.
playlist.enqueue( ... ): like playlist.add() except that track isn't played.
-playlist.get( [what, [tree]] ): Get the playist.
+playlist.get( [what, [tree]] ): Get the playlist.
If "what" is a number, then this will return the corresponding playlist
item's playlist hierarchy. If it is "normal" or "playlist", it will
return the normal playlist. If it is "ml" or "media library", it will
return the media library. If it is "root" it will return the full playlist.
If it is a service discovery module's name, it will return that service
discovery's playlist. If it is any other string, it won't return anything.
- Else it will return the fullplaylist.
+ Else it will return the full playlist.
The second argument, "tree", is optional. If set to true or unset, the
playlist will be returned in a tree layout. If set to false, the playlist
will be returned using the flat layout.
Each playlist item returned will have the following members:
.id: The item's id.
- .flags: a table with the following members if the corresponing flag is
+ .flags: a table with the following members if the corresponding flag is
set:
.save
.skip
.duration: (-1 if unknown)
.nb_played:
.children: A table of children playlist items.
+playlist.search( name ): filter the playlist items with the given string
+playlist.current(): return the current input item
+playlist.sort( key ): sort the playlist according to the key.
+ Key must be one of the followings values: 'id', 'title', 'title nodes first',
+ 'artist', 'genre', 'random', 'duration',
+ 'title numeric' or 'album'.
+playlist.status(): return the playlist status: 'stopped', 'playing', 'paused' or 'unknown'.
FIXME: add methods to get an item's meta, options, es ...
sd.add( name ): Add service discovery.
sd.remove( name ): Remove service discovery.
sd.is_loaded( name ): Check if service discovery is loaded.
+sd.add_node( ... ): Add a node to the service discovery.
+ The node object has the following members:
+ .title: the node's name
+ .arturl: the node's ArtURL (OPTIONAL)
+sd.add_item( ... ): Add an item to the service discovery.
+ The item object has the same members as the one in playlist.add().
+ Returns the input item.
+sd.remove_item( item ): remove the item.
+
+n = vlc.sd.add_node( {title="Node"} )
+n:add_subitem( ... ): Same as sd.add_item(), but as a subitem of n.
+n:add_node( ... ): Same as sd.add_node(), but as a subnode of n.
Stream
------
stream( url ): Instantiate a stream object for specific url.
+memory_stream( string ): Instantiate a stream object containing a specific string.
+ Those two functions return the stream object upon success and nil if an
+ error occurred, in that case, the second return value will be an error message.
s = vlc.stream( "http://www.videolan.org/" )
s:read( 128 ) -- read up to 128 characters. Return 0 if no more data is available (FIXME?).
variables as it had arguments.
strings.convert_xml_special_chars( [str1, [str2, [...]]] ): Do the inverse
operation.
+strings.iconv( str1 to, str2 from, str ): use vlc_iconv to convert string
+ from encoding to another
Variables
---------
var.get( object, name ): Get the object's variable "name"'s value.
-var.set( object, name, value ): Set the object's variable "name" to "value".
var.get_list( object, name ): Get the object's variable "name"'s value list.
1st return value is the value list, 2nd return value is the text list.
+var.set( object, name, value ): Set the object's variable "name" to "value".
var.create( object, name, value ): Create and set the object's variable "name"
to "value". Created vars can be of type float, string or bool.
var.command( object name, name, argument ): Issue "object name"'s "name"
command with argument "argument".
-var.libvlc_command( name, arguement ): Issue libvlc's "name" command with
+var.libvlc_command( name, argument ): Issue libvlc's "name" command with
argument "argument".
Video
Volume
------
+volume.get(): Get volume.
volume.set( level ): Set volume to an absolute level between 0 and 1024.
256 is 100%.
-volume.get(): Get volume.
volume.up( [n] ): Increment volume by n steps of 32. n defaults to 1.
volume.down( [n] ): Decrement volume by n steps of 32. n defaults to 1.
+XML
+---
+xml = vlc.xml(): Create an xml object.
+reader = xml:create_reader( stream ): create an xml reader that use the given stream.
+reader:read(): read some data
+reader:node_type(): return the type of the curret node: 'none', 'startelem', 'endelem' or 'text'.
+reader:name(): name of the element
+reader:value(): value of the element
+reader:next_attr(): next attribute of the element
+
+The simplexml module can also be used to parse XML documents easily.
projects / vlc / blobdiff