3 files changed, 61 insertions, 12 deletions

diff --git a/docs/specification.rst b/docs/specification.rst
index aad200c04d..ab16a0bb68 100644
--- a/docs/specification.rst
+++ b/docs/specification.rst
@@ -1182,16 +1182,16 @@ This event is sent by the caller when they wish to establish a call.
     - ``type`` : "string" - The type of session description, in this case 'offer'
     - ``sdp`` : "string" - The SDP text of the session description
 
-``m.call.candidate``
+``m.call.candidates``
 This event is sent by callers after sending an invite and by the callee after answering.
-Its purpose is to give the other party an additional ICE candidate to try using to
+Its purpose is to give the other party additional ICE candidates to try using to
 communicate.
 
   Required keys:
     - ``call_id`` : "string" - The ID of the call this event relates to
     - ``version`` : "integer" - The version of the VoIP specification this messages
                                 adheres to. his specification is version 0.
-    - ``candidate`` : "candidate object" - Object describing the candidate.
+    - ``candidates`` : "array of candidate objects" - Array of object describing the candidates.
 
 ``Candidate Object``
 
diff --git a/webclient/components/matrix/matrix-call.js b/webclient/components/matrix/matrix-call.js
index 2e3e2b0967..fd21198d24 100644
--- a/webclient/components/matrix/matrix-call.js
+++ b/webclient/components/matrix/matrix-call.js
@@ -47,6 +47,10 @@ angular.module('MatrixCall', [])
         this.call_id = "c" + new Date().getTime();
         this.state = 'fledgling';
         this.didConnect = false;
+
+        // a queue for candidates waiting to go out. We try to amalgamate candidates into a single candidate message where possible
+        this.candidateSendQueue = [];
+        this.candidateSendTries = 0;
     }
 
     MatrixCall.prototype.createPeerConnection = function() {
@@ -174,12 +178,7 @@ angular.module('MatrixCall', [])
     MatrixCall.prototype.gotLocalIceCandidate = function(event) {
         console.log(event);
         if (event.candidate) {
-            var content = {
-                version: 0,
-                call_id: this.call_id,
-                candidate: event.candidate
-            };
-            this.sendEventWithRetry('m.call.candidate', content);
+            this.sendCandidate(event.candidate);
         }
     }
 
@@ -370,5 +369,53 @@ angular.module('MatrixCall', [])
         }, delayMs);
     };
 
+    // Sends candidates with are sent in a special way because we try to amalgamate them into one message
+    MatrixCall.prototype.sendCandidate = function(content) {
+        this.candidateSendQueue.push(content);
+        var self = this;
+        if (this.candidateSendTries == 0) $timeout(function() { self.sendCandidateQueue(); }, 100);
+    };
+
+    MatrixCall.prototype.sendCandidateQueue = function(content) {
+        if (this.candidateSendQueue.length == 0) return;
+
+        var cands = this.candidateSendQueue;
+        this.candidateSendQueue = [];
+        ++this.candidateSendTries;
+        var content = {
+            version: 0,
+            call_id: this.call_id,
+            candidates: cands
+        };
+        var self = this;
+        console.log("Attempting to send "+cands.length+" candidates");
+        matrixService.sendEvent(self.room_id, 'm.call.candidates', undefined, content).then(function() { self.candsSent(); }, function(error) { self.candsSendFailed(cands, error); } );
+    };
+
+    MatrixCall.prototype.candsSent = function() {
+        this.candidateSendTries = 0;
+        this.sendCandidateQueue();
+    };
+
+    MatrixCall.prototype.candsSendFailed = function(cands, error) {
+        for (var i = 0; i < cands.length; ++i) {
+            this.candidateSendQueue.push(cands[i]);
+        }
+
+        if (this.candidateSendTries > 5) {
+            console.log("Failed to send candidates on attempt "+ev.tries+". Giving up for now.");
+            this.candidateSendTries = 0;
+            return;
+        }
+
+        var delayMs = 500 * Math.pow(2, this.candidateSendTries);
+        ++this.candidateSendTries;
+        console.log("Failed to send candidates. Retrying in "+delayMs+"ms");
+        var self = this;
+        $timeout(function() {
+            self.sendCandidateQueue();
+        }, delayMs);
+    };
+
     return MatrixCall;
 }]);
diff --git a/webclient/components/matrix/matrix-phone-service.js b/webclient/components/matrix/matrix-phone-service.js
index b0dcf19100..2d0732a8da 100644
--- a/webclient/components/matrix/matrix-phone-service.js
+++ b/webclient/components/matrix/matrix-phone-service.js
@@ -77,13 +77,15 @@ angular.module('matrixPhoneService', [])
                 return;
             }
             call.receivedAnswer(msg);
-        } else if (event.type == 'm.call.candidate') {
+        } else if (event.type == 'm.call.candidates') {
             var call = matrixPhoneService.allCalls[msg.call_id];
             if (!call) {
-                console.log("Got candidate for unknown call ID "+msg.call_id);
+                console.log("Got candidates for unknown call ID "+msg.call_id);
                 return;
             }
-            call.gotRemoteIceCandidate(msg.candidate);
+            for (var i = 0; i < msg.candidates.length; ++i) {
+                call.gotRemoteIceCandidate(msg.candidates[i]);
+            }
         } else if (event.type == 'm.call.hangup') {
             var call = matrixPhoneService.allCalls[msg.call_id];
             if (!call) {