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Copy pathwebRTC.js
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Copy pathwebRTC.js
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384 lines (321 loc) · 10.9 KB
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'use strict';
var messageCounter = 0;
var peerConnection;
var localTestingUrl = "ws://10.0.0.11:8889/rws/ws";
var pcConfig = { "iceServers": [{ "urls": "stun:stun.l.google.com:19302" }] };
var pcOptions = { optional: [{ DtlsSrtpKeyAgreement: true }] };
var mediaConstraints = { 'mandatory': { 'OfferToReceiveAudio': true, 'OfferToReceiveVideo': true } };
var remoteStream;
var remoteVideo;
function trace(arg) {
var now = (window.performance.now() / 1000).toFixed(3);
console.log(now + ': ', arg);
}
function isPrivateIP(ip) {
var parts = ip.split('.');
return parts[0] === '10' ||
(parts[0] === '172' && (parseInt(parts[1], 10) >= 16 && parseInt(parts[1], 10) <= 31)) ||
(parts[0] === '192' && parts[1] === '168');
}
///////////////////////////////////////////////////////////////////////////////
//
// PeerConnection
//
///////////////////////////////////////////////////////////////////////////////
function createPeerConnection() {
try {
peerConnection = new RTCPeerConnection(pcConfig, pcOptions);
peerConnection.onicecandidate = function(event) {
if (event.candidate) {
var candidate = {
type: 'candidate',
label: event.candidate.sdpMLineIndex,
id: event.candidate.sdpMid,
candidate: event.candidate.candidate
};
doSend(JSON.stringify(candidate));
} else {
trace("End of candidates.");
}
};
peerConnection.onconnecting = onSessionConnecting;
peerConnection.onopen = onSessionOpened;
peerConnection.onaddstream = onRemoteStreamAdded;
peerConnection.onremovestream = onRemoteStreamRemoved;
trace("Created RTCPeerConnnection with config: " + JSON.stringify(pcConfig));
} catch (e) {
trace("Failed to create PeerConnection exception: " + e.message);
}
}
function onRemoteStreamAdded(event) {
trace("Remote stream added:", event.stream);
remoteVideo.srcObject = event.stream;
}
function sld_success_cb() {
trace("setLocalDescription success");
}
function sld_failure_cb() {
trace("setLocalDescription failed");
}
function aic_success_cb() {
trace("addIceCandidate success");
}
function aic_failure_cb() {
trace("addIceCandidate failed");
}
function doHandlePeerMessage(data) {
++messageCounter;
var dataJson = JSON.parse(data);
trace("Handle Message :", JSON.stringify(dataJson));
if (dataJson["type"] == "offer") { // Processing offer
trace("Offer from PeerConnection");
var sdp_returned = forceChosenVideoCodec(dataJson.sdp, 'H264/90000');
dataJson.sdp = sdp_returned;
// Creating PeerConnection
createPeerConnection();
peerConnection.setRemoteDescription(new RTCSessionDescription(dataJson),
onRemoteSdpSucces, onRemoteSdpError);
peerConnection.createAnswer(function(sessionDescription) {
trace("Create answer:", sessionDescription);
peerConnection.setLocalDescription(sessionDescription, sld_success_cb, sld_failure_cb);
var data = JSON.stringify(sessionDescription);
trace("Sending Answer: " + data);
doSend(data);
}, function(error) { // error
trace("Create answer error:", error);
}, mediaConstraints); // type error
} else if (dataJson["type"] == "candidate") { // Processing candidate
trace("Adding ICE candiate " + dataJson.candidate);
trace("Adding mLineIndex " + dataJson.label);
var ice_candidate = new RTCIceCandidate({
sdpMLineIndex: dataJson.label,
sdpMid: dataJson.id,
candidate: dataJson.candidate
});
peerConnection.addIceCandidate(ice_candidate, aic_success_cb, aic_failure_cb);
}
}
function onSessionConnecting(message) {
trace("Session connecting.");
}
function onSessionOpened(message) {
trace("Session opened.");
}
function onRemoteStreamRemoved(event) {
trace("Remote stream removed.");
}
function onRemoteSdpError(event) {
console.error('onRemoteSdpError', event.name, event.message);
}
function onRemoteSdpSucces() {
trace('onRemoteSdpSucces');
}
function forceChosenVideoCodec(sdp, codec) {
return maybePreferCodec(sdp, 'video', 'send', codec);
}
function forceChosenAudioCodec(sdp, codec) {
return maybePreferCodec(sdp, 'audio', 'send', codec);
}
// Copied from AppRTC's sdputils.js:
// Sets |codec| as the default |type| codec if it's present.
// The format of |codec| is 'NAME/RATE', e.g. 'opus/48000'.
function maybePreferCodec(sdp, type, dir, codec) {
var str = type + ' ' + dir + ' codec';
if (codec === '') {
trace('No preference on ' + str + '.');
return sdp;
}
trace('Prefer ' + str + ': ' + codec); // kclyu
var sdpLines = sdp.split('\r\n');
// Search for m line.
var mLineIndex = findLine(sdpLines, 'm=', type);
if (mLineIndex === null) {
trace('* not found error: ' + str + ': ' + codec); // kclyu
return sdp;
}
// If the codec is available, set it as the default in m line.
var codecIndex = findLine(sdpLines, 'a=rtpmap', codec);
trace('mLineIndex Line: ' + sdpLines[mLineIndex]);
trace('found Prefered Codec in : ' + codecIndex + ': ' + sdpLines[codecIndex]);
trace('codecIndex', codecIndex);
if (codecIndex) {
var payload = getCodecPayloadType(sdpLines[codecIndex]);
if (payload) {
sdpLines[mLineIndex] = setDefaultCodec(sdpLines[mLineIndex], payload);
//sdpLines[mLineIndex] = setDefaultCodecAndRemoveOthers(sdpLines, sdpLines[mLineIndex], payload);
}
}
// delete id 100(VP8) and 101(VP8)
trace('** Modified LineIndex Line: ' + sdpLines[mLineIndex]);
sdp = sdpLines.join('\r\n');
return sdp;
}
// Find the line in sdpLines that starts with |prefix|, and, if specified,
// contains |substr| (case-insensitive search).
function findLine(sdpLines, prefix, substr) {
return findLineInRange(sdpLines, 0, -1, prefix, substr);
}
// Find the line in sdpLines[startLine...endLine - 1] that starts with |prefix|
// and, if specified, contains |substr| (case-insensitive search).
function findLineInRange(sdpLines, startLine, endLine, prefix, substr) {
var realEndLine = endLine !== -1 ? endLine : sdpLines.length;
for (var i = startLine; i < realEndLine; ++i) {
if (sdpLines[i].indexOf(prefix) === 0) {
if (!substr ||
sdpLines[i].toLowerCase().indexOf(substr.toLowerCase()) !== -1) {
return i;
}
}
}
return null;
}
// Gets the codec payload type from an a=rtpmap:X line.
function getCodecPayloadType(sdpLine) {
var pattern = new RegExp('a=rtpmap:(\\d+) \\w+\\/\\d+');
var result = sdpLine.match(pattern);
return (result && result.length === 2) ? result[1] : null;
}
// Returns a new m= line with the specified codec as the first one.
function setDefaultCodec(mLine, payload) {
var elements = mLine.split(' ');
// Just copy the first three parameters; codec order starts on fourth.
var newLine = elements.slice(0, 3);
// Put target payload first and copy in the rest.
newLine.push(payload);
for (var i = 3; i < elements.length; i++) {
if (elements[i] !== payload) {
newLine.push(elements[i]);
}
}
return newLine.join(' ');
}
function setDefaultCodecAndRemoveOthers(sdpLines, mLine, payload) {
var elements = mLine.split(' ');
// Just copy the first three parameters; codec order starts on fourth.
var newLine = elements.slice(0, 3);
// Put target payload first and copy in the rest.
newLine.push(payload);
for (var i = 3; i < elements.length; i++) {
if (elements[i] !== payload) {
// continue to remove all matching lines
for (var line_removed = true; line_removed;) {
line_removed = RemoveLineInRange(sdpLines, 0, -1, "a=rtpmap", elements[i]);
}
// continue to remove all matching lines
for (var line_removed = true; line_removed;) {
line_removed = RemoveLineInRange(sdpLines, 0, -1, "a=rtcp-fb", elements[i]);
}
}
}
return newLine.join(' ');
}
function RemoveLineInRange(sdpLines, startLine, endLine, prefix, substr) {
var realEndLine = endLine !== -1 ? endLine : sdpLines.length;
for (var i = startLine; i < realEndLine; ++i) {
if (sdpLines[i].indexOf(prefix) === 0) {
if (!substr ||
sdpLines[i].toLowerCase().indexOf(substr.toLowerCase()) !== -1) {
var str = "Deleting(index: " + i + ") : " + sdpLines[i];
trace(str);
sdpLines.splice(i, 1);
return true;
}
}
}
return false;
}
///////////////////////////////////////////////////////////////////////////////
//
// WebSocket
//
///////////////////////////////////////////////////////////////////////////////
// TODO refactoring is reqquired
var websocket;
function ConnectWebSocket(websocket_url) {
trace("WebSocket URL : " + websocket_url);
websocket = new WebSocket(websocket_url);
websocket.onopen = function(event) { onOpen(event) };
websocket.onclose = function(event) { onClose(event) };
websocket.onmessage = function(event) { onMessage(event) };
websocket.onerror = function(event) { onError(event) };
}
function onOpen(event) {
trace("Websocket connnected: " + websocket.url);
doRegister();
}
function onClose(event) {
trace("Websocket Disconnected");
doDisconnect();
}
function onMessage(event) {
trace("WSS -> C: " + event.data);
var dataJson = JSON.parse(event.data);
if (dataJson["cmd"] == "send") {
doHandlePeerMessage(dataJson["msg"]);
}
}
function onError(event) {
trace("An error occured while connecting : " + event.data);
}
// window.addEventListener("load", init, false);
function WebSocketSend(message) {
if (websocket.readyState == WebSocket.OPEN ||
websocket.readyState == WebSocket.CONNECTING) {
trace("C --> WSS: " + message);
websocket.send(message);
// var data = new ArrayBuffer(message);
//var byteArray = new Uint8Array(message);
//websocket.send(byteArray.buffer);
return true;
}
trace("failed to send :" + message);
return false;
}
// Return a random numerical string.
function randomString(strLength) {
var result = [];
strLength = strLength || 5;
var charSet = '0123456789';
while (strLength--) {
result.push(charSet.charAt(Math.floor(Math.random() * charSet.length)));
}
return result.join('');
}
function doConnect(url, video, cbDone) {
// check whether WebSocket is suppored in this browser.
if (window.WebSocket) {
video.onloadeddata = cbDone;
remoteVideo = video;
ConnectWebSocket(url);
} else {
trace("doConnect: WebSocket is not suppported in this platform!");
}
}
function doRegister() {
// No Room concept, random generate room and client id.
var register = {
cmd: 'register',
roomid: randomString(9),
clientid: randomString(8)
};
var register_message = JSON.stringify(register);
WebSocketSend(register_message);
}
function doSend(data) {
var message = {
cmd: "send",
msg: data,
error: ""
};
var data_message = JSON.stringify(message);
if (WebSocketSend(data_message) == false) {
trace("Failed to send data: " + data_message);
return false;
};
return true;
}
function doDisconnect() {
if (websocket.readyState == 1) {
websocket.close();
};
}
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