jiti-meet/data_channels.js

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/* global connection, Strophe, updateLargeVideo, focusedVideoSrc*/
// cache datachannels to avoid garbage collection
// https://code.google.com/p/chromium/issues/detail?id=405545
var _dataChannels = [];
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/**
* Callback triggered by PeerConnection when new data channel is opened
* on the bridge.
* @param event the event info object.
*/
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function onDataChannel(event)
{
var dataChannel = event.channel;
dataChannel.onopen = function ()
{
console.info("Data channel opened by the Videobridge!", dataChannel);
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// Code sample for sending string and/or binary data
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// Sends String message to the bridge
//dataChannel.send("Hello bridge!");
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// Sends 12 bytes binary message to the bridge
//dataChannel.send(new ArrayBuffer(12));
// when the data channel becomes available, tell the bridge about video
// selections so that it can do adaptive simulcast,
var largeVideoSrc = $('#largeVideo').attr('src');
var userJid = getJidFromVideoSrc(largeVideoSrc);
// we want the notification to trigger even if userJid is undefined,
// or null.
onSelectedEndpointChanged(userJid);
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};
dataChannel.onerror = function (error)
{
console.error("Data Channel Error:", error, dataChannel);
};
dataChannel.onmessage = function (event)
{
var data = event.data;
// JSON
var obj;
try
{
obj = JSON.parse(data);
}
catch (e)
{
console.error(
"Failed to parse data channel message as JSON: ",
data,
dataChannel);
}
if (('undefined' !== typeof(obj)) && (null !== obj))
{
var colibriClass = obj.colibriClass;
if ("DominantSpeakerEndpointChangeEvent" === colibriClass)
{
// Endpoint ID from the Videobridge.
var dominantSpeakerEndpoint = obj.dominantSpeakerEndpoint;
console.info(
"Data channel new dominant speaker event: ",
dominantSpeakerEndpoint);
$(document).trigger(
'dominantspeakerchanged',
[dominantSpeakerEndpoint]);
}
else if ("LastNEndpointsChangeEvent" === colibriClass)
{
// The new/latest list of last-n endpoint IDs.
var lastNEndpoints = obj.lastNEndpoints;
/*
* The list of endpoint IDs which are entering the list of
* last-n at this time i.e. were not in the old list of last-n
* endpoint IDs.
*/
var endpointsEnteringLastN = obj.endpointsEnteringLastN;
var stream = obj.stream;
console.log(
"Data channel new last-n event: ",
lastNEndpoints, endpointsEnteringLastN, obj);
$(document).trigger(
'lastnchanged',
[lastNEndpoints, endpointsEnteringLastN, stream]);
}
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else if ("SimulcastLayersChangedEvent" === colibriClass)
{
var endpointSimulcastLayers = obj.endpointSimulcastLayers;
$(document).trigger('simulcastlayerschanged', [endpointSimulcastLayers]);
}
else if ("StartSimulcastLayerEvent" === colibriClass)
{
var simulcastLayer = obj.simulcastLayer;
$(document).trigger('startsimulcastlayer', simulcastLayer);
}
else if ("StopSimulcastLayerEvent" === colibriClass)
{
var simulcastLayer = obj.simulcastLayer;
$(document).trigger('stopsimulcastlayer', simulcastLayer);
}
else
{
console.debug("Data channel JSON-formatted message: ", obj);
}
}
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};
dataChannel.onclose = function ()
{
console.info("The Data Channel closed", dataChannel);
var idx = _dataChannels.indexOf(dataChannel);
if (idx > -1)
_dataChannels = _dataChannels.splice(idx, 1);
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};
_dataChannels.push(dataChannel);
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}
/**
* Binds "ondatachannel" event listener to given PeerConnection instance.
* @param peerConnection WebRTC peer connection instance.
*/
function bindDataChannelListener(peerConnection)
{
peerConnection.ondatachannel = onDataChannel;
// Sample code for opening new data channel from Jitsi Meet to the bridge.
// Although it's not a requirement to open separate channels from both bridge
// and peer as single channel can be used for sending and receiving data.
// So either channel opened by the bridge or the one opened here is enough
// for communication with the bridge.
/*var dataChannelOptions =
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{
reliable: true
};
var dataChannel
= peerConnection.createDataChannel("myChannel", dataChannelOptions);
// Can be used only when is in open state
dataChannel.onopen = function ()
{
dataChannel.send("My channel !!!");
};
dataChannel.onmessage = function (event)
{
var msgData = event.data;
console.info("Got My Data Channel Message:", msgData, dataChannel);
};*/
}