synapse/webclient/components/matrix/matrix-call.js

/*
Copyright 2014 matrix.org

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

'use strict';

angular.module('MatrixCall', [])
.factory('MatrixCall', ['matrixService', 'matrixPhoneService', function MatrixCallFactory(matrixService, matrixPhoneService) {
    var MatrixCall = function(room_id) {
        this.room_id = room_id;
        this.call_id = "c" + new Date().getTime();
        this.state = 'fledgling';
    }

    navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia;

    window.RTCPeerConnection = window.RTCPeerConnection || window.webkitRTCPeerConnection || window.mozRTCPeerConnection;

    MatrixCall.prototype.placeCall = function() {
        self = this;
        matrixPhoneService.callPlaced(this);
        navigator.getUserMedia({audio: true, video: false}, function(s) { self.gotUserMediaForInvite(s); }, function(e) { self.getUserMediaFailed(e); });
        self.state = 'wait_local_media';
    };

    MatrixCall.prototype.initWithInvite = function(msg) {
        this.msg = msg;
        this.peerConn = new window.RTCPeerConnection({"iceServers":[{"urls":"stun:stun.l.google.com:19302"}]})
        self= this;
        this.peerConn.oniceconnectionstatechange = function() { self.onIceConnectionStateChanged(); };
        this.peerConn.onicecandidate = function(c) { self.gotLocalIceCandidate(c); };
        this.peerConn.onsignalingstatechange = function() { self.onSignallingStateChanged(); };
        this.peerConn.onaddstream = function(s) { self.onAddStream(s); };
        this.peerConn.setRemoteDescription(new RTCSessionDescription(this.msg.offer), self.onSetRemoteDescriptionSuccess, self.onSetRemoteDescriptionError);
        this.state = 'ringing';
    };

    MatrixCall.prototype.answer = function() {
        console.trace("Answering call "+this.call_id);
        self = this;
        navigator.getUserMedia({audio: true, video: false}, function(s) { self.gotUserMediaForAnswer(s); }, function(e) { self.getUserMediaFailed(e); });
        this.state = 'wait_local_media';
    };

    MatrixCall.prototype.hangup = function() {
        console.trace("Rejecting call "+this.call_id);
        var content = {
            msgtype: "m.call.hangup",
            version: 0,
            call_id: this.call_id,
        };
        matrixService.sendMessage(this.room_id, undefined, content).then(this.messageSent, this.messageSendFailed);
        this.state = 'ended';
    };

    MatrixCall.prototype.gotUserMediaForInvite = function(stream) {
        var audioTracks = stream.getAudioTracks();
        for (var i = 0; i < audioTracks.length; i++) {
            audioTracks[i].enabled = true;
        }
        this.peerConn = new window.RTCPeerConnection({"iceServers":[{"urls":"stun:stun.l.google.com:19302"}]})
        self = this;
        this.peerConn.oniceconnectionstatechange = function() { self.onIceConnectionStateChanged(); };
        this.peerConn.onsignalingstatechange = function() { self.onSignallingStateChanged(); };
        this.peerConn.onicecandidate = function(c) { self.gotLocalIceCandidate(c); };
        this.peerConn.onaddstream = function(s) { self.onAddStream(s); };
        this.peerConn.addStream(stream);
        this.peerConn.createOffer(function(d) {
            self.gotLocalOffer(d);
        }, function(e) {
            self.getLocalOfferFailed(e);
        });
        this.state = 'create_offer';
    };

    MatrixCall.prototype.gotUserMediaForAnswer = function(stream) {
        var audioTracks = stream.getAudioTracks();
        for (var i = 0; i < audioTracks.length; i++) {
            audioTracks[i].enabled = true;
        }
        this.peerConn.addStream(stream);
        self = this;
        var constraints = {
            'mandatory': {
                'OfferToReceiveAudio': true,
                'OfferToReceiveVideo': false
            },
        };
        this.peerConn.createAnswer(function(d) { self.createdAnswer(d); }, function(e) {}, constraints);
        this.state = 'create_answer';
    };

    MatrixCall.prototype.gotLocalIceCandidate = function(event) {
        console.trace(event);
        if (event.candidate) {
            var content = {
                msgtype: "m.call.candidate",
                version: 0,
                call_id: this.call_id,
                candidate: event.candidate
            };
            matrixService.sendMessage(this.room_id, undefined, content).then(this.messageSent, this.messageSendFailed);
        }
    }

    MatrixCall.prototype.gotRemoteIceCandidate = function(cand) {
        console.trace("Got ICE candidate from remote: "+cand);
        var candidateObject = new RTCIceCandidate({
            sdpMLineIndex: cand.label,
            candidate: cand.candidate
        });
        this.peerConn.addIceCandidate(candidateObject, function() {}, function(e) {});
    };

    MatrixCall.prototype.receivedAnswer = function(msg) {
        this.peerConn.setRemoteDescription(new RTCSessionDescription(msg.answer), self.onSetRemoteDescriptionSuccess, self.onSetRemoteDescriptionError);
        this.state = 'connecting';
    };

    MatrixCall.prototype.gotLocalOffer = function(description) {
        console.trace("Created offer: "+description);
        this.peerConn.setLocalDescription(description);

        var content = {
            msgtype: "m.call.invite",
            version: 0,
            call_id: this.call_id,
            offer: description
        };
        matrixService.sendMessage(this.room_id, undefined, content).then(this.messageSent, this.messageSendFailed);
        this.state = 'invite_sent';
    };

    MatrixCall.prototype.createdAnswer = function(description) {
        console.trace("Created answer: "+description);
        this.peerConn.setLocalDescription(description);
        var content = {
            msgtype: "m.call.answer",
            version: 0,
            call_id: this.call_id,
            answer: description
        };
        matrixService.sendMessage(this.room_id, undefined, content).then(this.messageSent, this.messageSendFailed);
        this.state = 'connecting';
    };

    MatrixCall.prototype.messageSent = function() {
    };
    
    MatrixCall.prototype.messageSendFailed = function(error) {
    };

    MatrixCall.prototype.getLocalOfferFailed = function(error) {
        this.onError("Failed to start audio for call!");
    };

    MatrixCall.prototype.getUserMediaFailed = function() {
        this.onError("Couldn't start capturing audio! Is your microphone set up?");
    };

    MatrixCall.prototype.onIceConnectionStateChanged = function() {
        console.trace("Ice connection state changed to: "+this.peerConn.iceConnectionState);
        if (this.peerConn.iceConnectionState == 'completed') {
            this.state = 'connected';
        }
    };

    MatrixCall.prototype.onSignallingStateChanged = function() {
        console.trace("Signalling state changed to: "+this.peerConn.signalingState);
    };

    MatrixCall.prototype.onSetRemoteDescriptionSuccess = function() {
        console.trace("Set remote description");
    };
    
    MatrixCall.prototype.onSetRemoteDescriptionError = function(e) {
        console.trace("Failed to set remote description"+e);
    };

    MatrixCall.prototype.onAddStream = function(event) {
        console.trace("Stream added"+event);
        var player = new Audio();
        player.src = URL.createObjectURL(event.stream);
        player.play();
    };

    return MatrixCall;
}]);