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The example of video chat with screen sharing
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To analyze the code get video-chat-and-screen-sharing.js file version with hash 456b1c7 ecbadc3 that can be found here and is available to download in build 2.0.201212.
1. API initializing.
Flashphoner.init() code
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try {
Flashphoner.init();
} catch(e) {
$("#notifyFlash").text("Your browser doesn't support WebRTC technology needed for this example");
return;
} |
2. Connection to the server
RoomApi.connect() code
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connection = RoomApi.connect({urlServer: url, username: username}).on(SESSION_STATUS.FAILED, function(session){
setStatus('#status', session.status());
onLeft();
}).on(SESSION_STATUS.DISCONNECTED, function(session) {
setStatus('#status', session.status());
onLeft();
}).on(SESSION_STATUS.ESTABLISHED, function(session) {
setStatus('#status', session.status());
joinRoom();
}); |
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ConnectionStatusEvent ESTABLISHED code
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connection = RoomApi.connect({urlServer: url, username: username}).on(SESSION_STATUS.FAILED, function(session){
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}).on(SESSION_STATUS.DISCONNECTED, function(session) {
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}).on(SESSION_STATUS.ESTABLISHED, function(session) {
setStatus('#status', session.status());
joinRoom();
}); |
4. Joining to the room
connection.join() code
To join, name of the conference room is passed to the method. (The name can be specified as parameter in the URL of the client page; otherwise, random name will be generated.)
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5. Receiving the event describing chat room state
RoomStatusEvent STATE code
On this event:
- the length of the array of Participant objects returned by method Room.getParticipants() is determined to get the number of already connected participants
- if the maximum allowed number of participants had already been reached, the user leaves the "room"
- otherwise, the user starts publishing video stream
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6. Screen streaming
room.publish() code
These parameters are passed to room.publish() method:
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7. Receiving the event notifying that other participant joined to the room
RoomStatusEvent JOINED code
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connection.join({name: getRoomName()}).on(ROOM_EVENT.STATE, function(room){
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}).on(ROOM_EVENT.JOINED, function(participant){
installParticipant(participant);
addMessage(participant.name(), "joined");
}).on(ROOM_EVENT.LEFT, function(participant){
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}).on(ROOM_EVENT.PUBLISHED, function(participant){
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}).on(ROOM_EVENT.FAILED, function(room, info){
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}).on(ROOM_EVENT.MESSAGE, function(message){
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}); |
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RoomStatusEvent PUBLISHED code
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connection.join({name: getRoomName()}).on(ROOM_EVENT.STATE, function(room){
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}).on(ROOM_EVENT.JOINED, function(participant){
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}).on(ROOM_EVENT.LEFT, function(participant){
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}).on(ROOM_EVENT.PUBLISHED, function(participant){
playParticipantsStream(participant);
}).on(ROOM_EVENT.FAILED, function(room, info){
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}).on(ROOM_EVENT.MESSAGE, function(message){
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}); |
9. Playback of video stream.
participant.play() code
<div> element, in which the video will be displayed depending on source (web camera or screen), is passed to the participant.play() method.
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10. Stop of screen sharing.
stream.stop() code
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room.publish(options).on(STREAM_STATUS.FAILED, function (stream) {
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}).on(STREAM_STATUS.PUBLISHING, function (stream) {
/*
* User can stop sharing screen capture using Chrome "stop" button.
* Catch onended video track event and stop publishing.
*/
document.getElementById(stream.id()).srcObject.getVideoTracks()[0].onended = function (e) {
stream.stop();
};
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}).on(STREAM_STATUS.UNPUBLISHED, function(stream) {
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}); |
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StreamStatusEvent UNPUBLISHED code
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room.publish(options).on(STREAM_STATUS.FAILED, function (stream) {
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}).on(STREAM_STATUS.PUBLISHING, function (stream) {
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}).on(STREAM_STATUS.UNPUBLISHED, function(stream) {
onStopSharing();
}); |
12. Leaving chat room.
room.leave() code
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function onJoined(room) {
$("#joinBtn").text("Leave").off('click').click(function(){
$(this).prop('disabled', true);
room.leave().then(onLeft, onLeft);
}).prop('disabled', false);
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} |