Difference between revisions of "Documentation:WebPlugin"

Revision as of 16:11, 7 February 2010

Building HTML pages for Mozilla/Firefox/Internet Explorer/Safari

The following description works for any of the browsers VLC supports. The JavaScript API has been unified between Mozilla/Firefox/IE (ActiveX) and Safari, thus targetting at all of the major OS out there.

This is only valid for VLC media player version 0.8.6 and above.

Additionally to viewing video on all pages, you can build custom pages that will use the advanced features of the plugin, using Javascript functions to control playback or extract information from the plugin.

API description

The vlc plugin exports serveral objects that can be accessed for setting and getting information. When used improperly the API's will throw an exception that includes a string that explains what happened. For example when asking for vlc.input.length when there is no playlist item playing.

The vlc plugin knows the following objects:

audio: Access audio properties.
input: Access input properties.
playlist: Access playlist properties.
subtitle: Access subtitle properties.
video: Access video properties.
video.marquee: Access marquee video filter properties.
video.logo: Access logo video filter properties.
log: Access log properties.
messages: Access to log message properties.
iterator: Access to log iterator properties.

The following JavaScript code shows howto get a reference to the vlc plugin. This reference can then be used to access the objects of the vlc plugin.

<html>
<title>VLC Mozilla plugin test page</title>
<body>
<embed type="application/x-vlc-plugin" pluginspage="http://www.videolan.org" version="VideoLAN.VLCPlugin.2"
    width="640"
    height="480"
    id="vlc">
</embed>
<script language="Javascript">
<!--
var vlc = document.getElementById("vlc");
vlc.audio.toggleMute();
!-->
</script>
</body>
</html>

Root object

readonly properties

VersionInfo: returns version information string

read/write properties

none

methods

vlc.versionInfo(): returns version information string (same as VersionInfo)

vlc.addEventListener(eventname, callback, bubble): (only for Mozilla) add a listener for mentioned event name, callback expects a function and bubble influences the order of eventhandling by JS (usually it is set to false).
vlc.removeEventListener(eventname, callback, bubble): (only for Mozilla) remove listener for mentioned event name, callback expects a function and bubble influences the order of eventhandling by JS (usually it is set to false).

vlc.attachEvent(eventname, callback): ( only for ActiveX) add listener for mentioned event name, callback expects a function
vlc.removeEvent(eventname, callback): ( only for ActiveX) remove listener for mentioned event name, callback expects a function

events

NothingSpecial: vlc is in idle state doing nothing but waiting for a command to be issued
Opening: vlc is opening an media resource locator (MRL)
Buffering: vlc is buffering
Playing: vlc is playing a media
Paused: vlc is in paused state
Forward: vlc is fastforwarding through the media (works only when an input supports forward playback)
Backward: vlc is going backwards through the media (works only when an input supports backwards playback)
EncounteredError: vlc has encountered an error and is unable to continue
EndReached: vlc has reached the end of current playlist
TimeChanged: time has changed
PositionChanged: media position has changed
SeekableChanged: media seekable flag has changed (true means media is seekable, false means it is not)
PausableChanged: media pausable flag has changed (true means media is pausaable, false means it is not)
MouseMoved: vlc detected a mouse movement in its video window
MouseButton: vlc detected a mouse button event in its video window
MouseClick: vlc detected a mouse click in its video window
MouseObject: vlc filter (eg: logo) detected a object movement in its video window

The following code snippit provides easy functions to register and unregister event callbacks on all supported platforms (currently only Linux mozilla based browsers and windows activeX objects for Internet Explorer).

<SCRIPT language="javascript">
<!--
function registerVLCEvent(event, handler)
{
   var vlc = getVLC("vlc");
   if (vlc) {
       if (vlc.attachEvent) {
           // Microsoft
           vlc.attachEvent (event, handler);
       } else if (vlc.addEventListener) {
           // Mozilla: DOM level 2
           vlc.addEventListener (event, handler, false);
       } else {
           // DOM level 0
           eval("vlc.on" + event + " = handler");
       }
   }
}
// stop listening to event
function unregisterVLCEvent(event, handler)
{
   var vlc = getVLC("vlc");
   if (vlc) {
       if (vlc.detachEvent) {
           // Microsoft
           vlc.detachEvent (event, handler);
       } else if (vlc.removeEventListener) {
           // Mozilla: DOM level 2
           vlc.removeEventListener (event, handler, false);
       } else {
           // DOM level 0
           eval("vlc.on" + event + " = null");
       }
   }
}
// event callback function for testing
function handleEvents(event)
{
   if (!event)
       event = window.event;
   if (event.target) {
       // Netscape based browser
       targ = event.target;
   } else if (event.srcElement) {
       // ActiveX
       targ = event.srcElement;
   } else {
       // No event object, just the value
       alert("Event value" + event );
       return;
   }
   if (targ.nodeType == 3) // defeat Safari bug
       targ = targ.parentNode;
   alert("Event " + event.type + " has fired from " + targ );
}
// Register a bunch of callbacks.
registerVLCEvent('NothingSpecial', handleEvents);
registerVLCEvent('Opening', handleEvents);
registerVLCEvent('Buffering', handleEvents);
registerVLCEvent('Playing', handleEvents);
registerVLCEvent('Paused', handleEvents);
registerVLCEvent('Forward', handleEvents);
registerVLCEvent('Backward', handleEvents);
registerVLCEvent('EncounteredError', handleEvents);
registerVLCEvent('EndReached', handleEvents);
registerVLCEvent('TimeChanged', handleEvents);
registerVLCEvent('PositionChanged', handleEvents);
registerVLCEvent('SeekableChanged', handleEvents);
registerVLCEvent('PausableChanged', handleEvents);
registerVLCEvent('MouseMove', handleEvents);
registerVLCEvent('MouseButton', handleEvents);
registerVLCEvent('MouseClick', handleEvents);
registerVLCEvent('MouseObject', handleEvents);
</script>
-->

Audio object

readonly properties

vlc.audio.count: (supported in vlc version >= 1.1.0) returns the number of audio track available.

read/write properties

vlc.audio.mute: boolean value to mute and ummute the audio.
vlc.audio.volume: a value between [0-200] which indicates a percentage of the volume.
vlc.audio.track: (supported in vlc version > 0.8.6) a value between [1-65535] which indicates the audio track to play or that is playing. a value of 0 means the audio is/will be disabled.
vlc.audio.channel: (supported in vlc version > 0.8.6) integer value between [1-5] that indicates which audio channel mode is used, values can be: "1=stereo", "2=reverse stereo", "3=left", "4=right", "5=dolby". Use vlc.audio.channel to check if setting of the audio channel mode has succeeded.

Audio Channel:
<SELECT readonly onChange='doAudioChannel(this.value)'>
   <OPTION value=1>Stereo</OPTION>
   <OPTION value=2>Reverse stereo</OPTION>
   <OPTION value=3>Left</OPTION>
   <OPTION value=4>Right</OPTION>
   <OPTION value=5>Dolby</OPTION>
</SELECT>

<SCRIPT language="javascript">
<!--
function doAudioChannel(value)
{
   var vlc = getVLC("vlc");
   vlc.audio.channel = parseInt(value);
   alert(vlc.audio.channel);
};
-->

methods

vlc.audio.toggleMute(): boolean toggle that mutes and unmutes the audio based upon the previous state.
vlc.audio.description(int i): (supported in vlc version >= 1.1.0) give the i-th audio track name. 0 corresponds to disable and 1 to the first audio track.

Input object

readonly properties

vlc.input.length: length of the input file in number of milliseconds. 0 is returned for 'live' streams or clips whose length cannot be determined by VLC. It returns -1 if no input is playing.
vlc.input.fps: frames per second returned as a float (typically 60.0, 50.0, 23.976, etc...)
vlc.input.hasVout: a boolean that returns true when the video is being displayed, it returns false when video is not displayed

read/write properties

vlc.input.position: normalized position in multimedia stream item given as a float value between [0.0 - 1.0]
vlc.input.time: the absolute position in time given in milliseconds, this property can be used to seek through the stream

<!-- absolute seek in stream !-->
vlc.input.time = <absolute seek>
<!-- relative seek in stream !-->
vlc.input.time = vlc.input.time + <relative seek>

vlc.input.state: current state of the input chain given as enumeration (IDLE=0, OPENING=1, BUFFERING=2, PLAYING=3, PAUSED=4, STOPPING=5, ENDED=6, ERROR=7). Note: Test for ENDED=6 to catch end of playback. Checking for STOPPING=5 is NOT ENOUGH.
vlc.input.rate: input speed given as float (1.0 for normal speed, 0.5 for half speed, 2.0 for twice as fast, etc.).

rate > 1              : is fastforward
rate > 0 and rate < 1 : is slow motion
rate < 0              : is rewind

methods

none

Playlist object

readonly properties

vlc.playlist.itemCount: number that returns the amount of items currently in the playlist (deprecated, do not use, see Playlist items)
vlc.playlist.isPlaying: a boolean that returns true if the current playlist item is playing and false when it is not playing
vlc.playlist.items: return the playlist items collection, see Playlist items

read/write properties

none

methods

vlc.playlist.add(mrl): add a playlist item as MRL. The MRL must be given as a string. Returns a number as an item identifier in playlist (this is not a position in playlist).
vlc.playlist.add(mrl,name,options): add a playlist item as MRL, with metaname 'name' and options 'options'. options are text arguments which can be provided either as a single string containing space separated values, akin to VLC command line, or as an array of string values. Returns a number as an item identifier in playlist (this is not a position in playlist).

 var options = new Array(":aspect-ratio=4:3", "--rtsp-tcp");
 var id = vlc.playlist.add("rtsp://servername/item/to/play", "fancy name", options);
 vlc.playlist.playItem(id);

vlc.playlist.play(): start playing the current playlist item
vlc.playlist.playItem(number): start playing the item whose identifier is number
vlc.playlist.togglePause(): toggle the pause state for the current playlist item
vlc.playlist.stop(): stop playing the current playlist item
vlc.playlist.next(): iterate to the next playlist item
vlc.playlist.prev(): iterate to the previous playlist item
vlc.playlist.clear(): empty the current playlist, all items will be deleted from the playlist (deprecated, do not use, see Playlist items)
vlc.playlist.removeItem(number): remove the item from playlist whose identifier is number (deprecated, do not use, see Playlist items)

Playlist items object

readonly properties

vlc.playlist.items.count: number of items currently in the playlist

read/write properties

none

methods

vlc.playlist.items.clear(): empty the current playlist, all items will be deleted from the playlist. If a movie is playing, it stop. Note that when this method returns, playlist may not have been entirely been cleared as this operation is performed asynchronously; use the count property to verify/wait until the playlist is empty.
vlc.playlist.items.remove(number): remove the item whose identifier is number from playlist. (note: this number isn't the position in the playlist, but the number given by vlc.playlist.add() )

Subtitle object

readonly properties

vlc.subtitle.count: (supported in vlc version >= 1.1.0) returns the number of subtitle available.

read/write properties

vlc.subtitle.track: (supported in vlc version >= 1.1.0) get and set the subtitle track to show on the video screen. The property takes an integer as input value [1..65535]. If subtitle track is set to 0, the subtitles will be disabled. If set to a value outside the current subtitle tracks range, then it will return -1 and display an error message.

methods

vlc.subtitle.description(int i): (supported in vlc version >= 1.1.0) give the i-th subtitle name. 0 correspond to disable and 1 to the first subtitle.

Video object

readonly properties

vlc.video.width: returns the horizontal size of the video
vlc.video.height: returns the vertical size of the video

read/write properties

vlc.video.fullscreen: when set to true the video will be displayed in fullscreen mode, when set to false the video will be shown inside the video output size. The property takes a boolean as input.
vlc.video.aspectRatio: get and set the aspect ratio to use in the video screen. The property takes a string as input value. Typical values are: "1:1", "4:3", "16:9", "16:10", "221:100" and "5:4"
vlc.video.subtitle: (supported in vlc version > 0.8.6a) get and set the subtitle track to show on the video screen. The property takes an integer as input value [1..65535]. If subtitle track is set to 0, the subtitles will be disabled. If set to a value outside the current subtitle tracks range, then it will return -1 and display an error message.
vlc.video.teletext: (supported in vlc version >= 0.9.0) get and set teletext page to show on the video stream. This will only work if a teletext elementary stream is available in the video stream. The property takes an integer as input value [0..999] for indicating the teletext page to view, setting the value to 0 means hide teletext. On error it will return -1 and display an error message.

methods

vlc.video.toggleFullscreen(): toggle the fullscreen mode based on the previous setting
vlc.video.toggleTeletext(): (supported in vlc version >= 0.9.0) toggle the teletext page to overlay transparent or not, based on the previous setting

Deinterlace Object

readonly properties

none

read/write properties

none

methods

vlc.video.deinterlace.enable("my_mode"): (supported in vlc version >= 1.1.0) enable deinterlacing with my_mode. You can enable it with "blend", "bob", "discard", "linear", "mean" or "x" mode. Enabling too soon deinterlacing may cause some problems. You have to wait that all variable are available before enabling it.
vlc.video.deinterlace.disable(): (supported in vlc version >= 1.1.0) disable deinterlacing.

Marquee Object

readonly properties

none

read/write properties

vlc.video.marquee.text: (supported in vlc version >= 1.1.0) display my text on the screen.
vlc.video.marquee.color: (supported in vlc version >= 1.1.0) change the text color. val is the new color to use (WHITE=0x000000, BLACK=0xFFFFFF, RED=0xFF0000, GREEN=0x00FF00, BLUE=0x0000FF...).
vlc.video.marquee.opacity: (supported in vlc version >= 1.1.0) change the text opacity, val is defined from 0 (completely transparent) to 255 (completely opaque).
vlc.video.marquee.position: (supported in vlc version >= 1.1.0) change the text position (CENTER=0, LEFT=1, RIGHT=2, TOP=4, TOP-LEFT=5, TOP-RIGHT=6, BOTTOM=8, BOTTOM-LEFT=9, BOTTOM_RIGHT=10).
vlc.video.marquee.refresh: (supported in vlc version >= 1.1.0) change the marquee refresh period.
vlc.video.marquee.size: (supported in vlc version >= 1.1.0) val define the new size for the text displayed on the screen. If the text is bigger than the screen then the text is not displayed.
vlc.video.marquee.timeout: (supported in vlc version >= 1.1.0) change the timeout value. val is defined in ms, but 0 value correspond to unlimited.
vlc.video.marquee.x: (supported in vlc version >= 1.1.0) change text abscissa.
vlc.video.marquee.y: (supported in vlc version >= 1.1.0) change text ordinate.

methods

vlc.video.marquee.enable(): (supported in vlc version >= 1.1.0) enable marquee filter.
vlc.video.marquee.disable(): (supported in vlc version >= 1.1.0) disable marquee filter.

Some problems may happen (option like color or text will not be applied) because of the VLC asynchronous functioning. To avoid it, after enabling marquee, you have to wait a little time before changing an option. But it should be fixed by the new vout implementation.

Logo Object

readonly properties

none

read/write properties

vlc.video.logo.opacity: (supported in vlc version >= 1.1.0) change the picture opacity, val is defined from 0 (completely transparent) to 255 (completely opaque).
vlc.video.logo.position: (supported in vlc version >= 1.1.0) change the text position ("center", "left", "right", "top", "top-left", "top-right", "bottom", "bottom-left", "bottom-right").
vlc.video.logo.delay: (supported in vlc version >= 1.1.0) display each picture for a duration of 1000 ms (default) before displaying the next picture.
vlc.video.logo.repeat: (supported in vlc version >= 1.1.0) number of loops for picture animation (-1=continuous, 0=disabled, n=n-times). The default is -1 (continuous).
vlc.video.logo.x: (supported in vlc version >= 1.1.0) change the x-offset for displaying the picture counting from top-left on the screen.
vlc.video.logo.y: (supported in vlc version >= 1.1.0) change the y-offset for displaying the picture counting from top-left on the screen.
vlc.video.logo.width: (supported in vlc version >= 1.1.0) change the picture width.
vlc.video.logo.height: (supported in vlc version >= 1.1.0) change the picture height.

methods

vlc.video.logo.enable(): (supported in vlc version >= 1.1.0) enable logo video filter.
vlc.video.logo.disable(): (supported in vlc version >= 1.1.0) disable logo video filter.
vlc.video.logo.file("file.png"): (supported in vlc version >= 1.1.0) display my file.png as logo on the screen.

Some problems may happen because of the VLC asynchronous functioning. To avoid it, after enabling logo video filter, you have to wait a little time before changing an option. But it should be fixed by the new vout implementation.

Log object

CAUTION: For security concern, VLC 1.0.0-rc1 is the latest (near-to-stable) version in which this object and its children are supported.

This object allows accessing VLC main message logging queue. Typically this queue capacity is very small (no nore than 256 entries) and can easily overflow, therefore messages should be read and cleared as often as possible.

readonly properties

vlc.log.messages: returns the message collection, see Messages object

read/write properties

vlc.log.verbosity: write number [-1,0,1,2,3] for changing the verbosity level of the log messages; messages whose verbosity is higher than set will be not be logged in the queue. The numbers have the following meaning: -1 disable, 0 info, 1 error, 2 warning, 3 debug.

methods

none

Messages object

CAUTION: For security concern, VLC 1.0.0-rc1 is the latest (near-to-stable) version in which this object and its children are supported.

readonly properties

messages.count: returns number of messages in the log

read/write properties

none

methods

messages.clear(): clear the current log buffer. It should be called as frequently as possible to not overflow the message queue. Call this method after the log messages of interest are read.
messages.iterator(): creates and returns an iterator object, used to iterate over the messages in the log. Don't clear the log buffer while holding an iterator object.

Messages Iterator object

CAUTION: For security concern, VLC 1.0.0-rc1 is the latest (near-to-stable) version in which this object and its children are supported.

readonly properties

iterator.hasNext: returns a boolean that indicates whether vlc.log.messages.next() will return the next message.

read/write properties

none

methods

iterator.next(): returns the next message object in the log, see Message object

Message object

CAUTION: For security concern, VLC 1.0.0-rc1 is the latest (near-to-stable) version in which this object and its children are supported.

message.severity: number that indicates the severity of the log message (0 = info, 1 = error, 2 = warning, 3 = debug)
message.name: name of VLC module that printed the log message (e.g: main, http, directx, etc...)
message.type: type of VLC module that printed the log message (eg: input, access, vout, sout, etc...)
message.message: the message text

Build HTML pages that use the plugin (VLC version up to 0.8.5)

WARNING: the APIs described in this section are deprecated, do not use. They no longer work on recent VLC version (> 0.8.5), either it being the ActiveX (Internet Explorer)/ Safari or Mozilla based browsers.

The following API description is only valid uptill version 0.8.5 of the mozilla plugin.

Additionally to viewing video on all pages, you can build custom pages that will use the advanced features of the plugin, using Javascript functions to control playback or extract information from the plugin.

The vlc plugin supports the following function calls:

play(): Start playing media in the plugin.
pause(): Pause playback.
stop(): Stop media playback.
fullscreen(): Switch the video to full screen.
set_volume(vol): Set the volume. vol has to be an int in the 0-200 range.
get_volume(): Get the current volume setting.
mute(): Toggle volume muting.
set_int_variable(var_name, value):
set_bool_variable(var_name, value):
set_str_variable(var_name, value):
get_int_variable(var_name):
get_bool_variable(var_name):
get_str_variable(var_name):
clear_playlist(): Clear the playlist.
add_item(mrl): Append an item whose location is given by the media resource locator to the playlist.
next()
previous()
isplaying(): return true if the plugin is playing something.
get_length(): Get the media's length in seconds.
get_position(): Get the current position in the media in percent.
get_time(): Get the current position in the media in seconds.
seek(seconds,is_relative): If is_relative is true, seek relatively to current time, else seek from beginning of the stream. Seek time is specified in seconds.

Here are a few examples of HTML pages that use the Mozilla plugin.

Example 1

In this example, the plugin will read an HTTP stream inside the web page. If the user goes fullscreen, he will have to press f or double-click on the video to go back in normal view.

<html>
<head><title>Demo of VLC mozilla plugin</title></head>

<body>

<h1>Demo of VLC mozilla plugin - Example 1</h1>

<embed type="application/x-vlc-plugin"
         name="video1"
         autoplay="no" loop="yes" width="400" height="300"
         target="http://server.example.org/video1.vob" />
<br />
  <a href="javascript:;" onclick='document.video1.play()'>Play video1</a>
  <a href="javascript:;" onclick='document.video1.pause()'>Pause video1</a>
  <a href="javascript:;" onclick='document.video1.stop()'>Stop video1</a>
  <a href="javascript:;" onclick='document.video1.fullscreen()'>Fullscreen</a>

</body>
</html>

Example 2

In this example, the plugin will read a multicast UDP/RTP stream in a dedicated video output window.

<html>
<head><title>Demo of VLC mozilla plugin</title></head>

<body>

<h1>Demo of VLC mozilla plugin - Example 2</h1>

<embed type="application/x-vlc-plugin"
         name="video2"
         autoplay="no" loop="no" hidden="yes"
         target="rtp://@239.255.12.42:5004" />
<br />
  <a href="javascript:;" onclick='document.video2.play()'>Play video2</a>
  <a href="javascript:;" onclick='document.video2.stop()'>Stop video2</a>
  <a href="javascript:;" onclick='document.video2.fullscreen()'>Fullscreen</a>

</body>
</html>

This page is part of official VLC media player Documentation (User Guide • Streaming HowTo • Hacker Guide • Modules)
Please read the Documentation Editing Guidelines before you edit the documentation

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

Difference between revisions of "Documentation:WebPlugin"

Revision as of 16:11, 7 February 2010

Contents

Building HTML pages for Mozilla/Firefox/Internet Explorer/Safari

API description

Root object

Audio object

Input object

Playlist object

Playlist items object

Subtitle object

Video object

Deinterlace Object

Marquee Object

Logo Object

Log object

Messages object

Messages Iterator object

Message object

Build HTML pages that use the plugin (VLC version up to 0.8.5)

Example 1

Example 2

Navigation menu

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