TT#145001 Call - Implement Stage-3-WebRTC-API

- Audio call (Chrome => Chrome)
- Audio call (Firefox => Firefox)
- Audio call (Chrome => Firefox)
- Audio call (Firefox => Chrome)

- Video call (Chrome => Chrome)
- Video call (Firefox => Firefox)

- Error message if JsSIP connection error occurs
- Fix error visibility timer

Change-Id: I20d55ba4a4f217fde0b5d46a2615314915ba81f0

src/api/ngcp-call.js

@@ -8,30 +8,68 @@ let $baseWebSocketUrl = null
 let $subscriber = null
 let $socket = null
 let $userAgent = null
+let $isVideoScreen = false
 let $outgoingRtcSession = null
 let $incomingRtcSession = null
 let $localMediaStream = null
 let $remoteMediaStream = null
-let $isVideoScreen = false
+let $videoTransceiver = null
+let $audioTransceiver = null
 
 const TERMINATION_OPTIONS = {
     status_code: 603,
     reason_phrase: 'Decline'
 }
 
+const MEDIA_VIDEO_DEFAULT_CONFIG = {
+    width: {
+        ideal: 4096
+    },
+    height: {
+        ideal: 2160
+    }
+}
+
 export const callEvent = new EventEmitter()
 
-function handleRemoteMediaStream (trackEvent) {
+function callTrackMuteHandler () {
-    const stream = trackEvent.streams[0]
+    if ($audioTransceiver) {
-    if (!$remoteMediaStream) {
+        $remoteMediaStream = new MediaStream([
-        $remoteMediaStream = stream
+            $audioTransceiver.receiver.track
+        ])
         callEvent.emit('remoteStream', $remoteMediaStream)
-    } else if ($remoteMediaStream && $remoteMediaStream.id !== stream.id) {
+    }
-        $remoteMediaStream = stream
+}
+
+function callTrackUnMuteHandler () {
+    if ($audioTransceiver && $videoTransceiver) {
+        $remoteMediaStream = new MediaStream([
+            $audioTransceiver.receiver.track,
+            $videoTransceiver.receiver.track
+        ])
         callEvent.emit('remoteStream', $remoteMediaStream)
     }
 }
 
+function handleRemoteMediaStream ({ transceiver }) {
+    if (!$audioTransceiver && transceiver.receiver.track.kind === 'audio') {
+        $audioTransceiver = transceiver
+    } else if (!$videoTransceiver && transceiver.receiver.track.kind === 'video') {
+        $videoTransceiver = transceiver
+        $videoTransceiver.receiver.track.onmute = callTrackMuteHandler
+        $videoTransceiver.receiver.track.onunmute = callTrackUnMuteHandler
+    }
+    const tracks = []
+    if ($audioTransceiver) {
+        tracks.push($audioTransceiver.receiver.track)
+    }
+    if ($videoTransceiver) {
+        tracks.push($videoTransceiver.receiver.track)
+    }
+    $remoteMediaStream = new MediaStream(tracks)
+    callEvent.emit('remoteStream', $remoteMediaStream)
+}
+
 function getSubscriberUri () {
     return 'sip:' + $subscriber.username + '@' + $subscriber.domain
 }
@@ -118,10 +156,6 @@ export async function callStart ({ number }) {
         mediaStream: $localMediaStream
     })
     $outgoingRtcSession.connection.ontrack = handleRemoteMediaStream
-    const delegateEvent = (eventName, newName) => {
-        $outgoingRtcSession.on(eventName, (event) => callEvent.emit(newName, event))
-    }
-    delegateEvent('failed', 'outgoingFailed')
 }
 
 export async function callAccept () {
@@ -165,56 +199,58 @@ export function callGetRtcSession () {
     }
 }
 
-export async function callChangeVideoStream (stream) {
+export function callGetRtcConnection () {
-    if ($localMediaStream && callGetRtcSession()) {
+    return callGetRtcSession().connection
-        callGetRtcSession().connection.getSenders().forEach(
+}
-            sender => callGetRtcSession().connection.removeTrack(sender)
+
-        )
+async function callStopVideo () {
-        $localMediaStream.getTracks().forEach(track => track.stop())
+    if ($videoTransceiver && $localMediaStream) {
-        $localMediaStream = stream
+        $localMediaStream.removeTrack($videoTransceiver.sender.track)
-        $localMediaStream.getTracks().forEach(
+        $videoTransceiver.sender.track.stop()
-            track => callGetRtcSession().connection.addTrack(track, $localMediaStream)
+        $videoTransceiver.direction = 'recvonly'
-        )
+        await $videoTransceiver.sender.replaceTrack(null)
         await callRenegotiate()
     }
 }
 
-export async function callAddCamera () {
+export async function callSendVideo (stream, audioMuted) {
-    await callChangeVideoStream(await navigator.mediaDevices.getUserMedia({
+    const videoTrack = stream.getVideoTracks()[0]
-        video: {
+    if ($videoTransceiver?.sender?.track) {
-            width: {
+        $localMediaStream.removeTrack($videoTransceiver.sender.track)
-                ideal: 4096
+        $videoTransceiver.sender.track.stop()
-            },
-            height: {
-                ideal: 2160
     }
-        },
+    $localMediaStream.addTrack(videoTrack)
-        audio: true
+    callEvent.emit('localStream', $localMediaStream)
-    }))
+    if (!$videoTransceiver) {
+        $videoTransceiver = callGetRtcConnection().addTransceiver(videoTrack, { direction: 'sendrecv' })
+        $videoTransceiver.receiver.track.onmute = callTrackMuteHandler
+        $videoTransceiver.receiver.track.onunmute = callTrackUnMuteHandler
+    } else {
+        $videoTransceiver.direction = 'sendrecv'
+        await $videoTransceiver.sender.replaceTrack(videoTrack)
+    }
+    await callRenegotiate()
+}
+
+export async function callAddCamera () {
     $isVideoScreen = false
+    await callSendVideo(await navigator.mediaDevices.getUserMedia({
+        video: MEDIA_VIDEO_DEFAULT_CONFIG,
+        audio: false
+    }))
 }
 
 export async function callAddScreen () {
     $isVideoScreen = true
-    await callChangeVideoStream(await navigator.mediaDevices.getDisplayMedia({
+    await callSendVideo(await navigator.mediaDevices.getDisplayMedia({
-        video: {
+        video: MEDIA_VIDEO_DEFAULT_CONFIG,
-            width: {
+        audio: false
-                ideal: 4096
-            },
-            height: {
-                ideal: 2160
-            }
-        },
-        audio: true
     }))
 }
 
 export async function callRemoveVideo () {
     $isVideoScreen = false
-    await callChangeVideoStream(await navigator.mediaDevices.getUserMedia({
+    await callStopVideo()
-        video: false,
-        audio: true
-    }))
 }
 
 export async function callRenegotiate () {
@@ -226,11 +262,11 @@ export async function callRenegotiate () {
 }
 
 export function callHasRemoteVideo () {
-    return $remoteMediaStream?.getVideoTracks?.()?.length > 0
+    return $videoTransceiver?.receiver?.track?.enabled
 }
 
 export function callHasLocalVideo () {
-    return $localMediaStream?.getVideoTracks?.()?.length > 0
+    return $videoTransceiver?.sender?.track?.enabled
 }
 
 export function callHasLocalCamera () {
@@ -242,21 +278,24 @@ export function callHasLocalScreen () {
 }
 
 export function callToggleMicrophone () {
-    const config = {
+    if ($audioTransceiver?.sender?.track) {
-        audio: true,
+        $audioTransceiver.sender.track.enabled = !$audioTransceiver.sender.track.enabled
-        video: false
-    }
-    const rtcSession = callGetRtcSession()
-    const muted = rtcSession?.isMuted()
-    if (muted.audio) {
-        rtcSession.unmute(config)
-    } else {
-        rtcSession.mute(config)
     }
 }
 
+export function callMute () {
+    return callGetRtcSession()?.mute()
+}
+
+export function callUnMute () {
+    return callGetRtcSession()?.unmute()
+}
+
 export function callIsMuted () {
-    return callGetRtcSession()?.isMuted()?.audio
+    if ($audioTransceiver?.sender?.track) {
+        return !$audioTransceiver.sender.track.enabled
+    }
+    return false
 }
 
 export function callSendDTMF (tone, transport = 'RFC2833') {
@@ -268,31 +307,59 @@ export function callSendDTMF (tone, transport = 'RFC2833') {
     }
 }
 
+/**
+ * Enables or disables the remote audio depending on the current state.
+ */
 export function callToggleRemoteAudio () {
-    if ($remoteMediaStream && $remoteMediaStream.getAudioTracks()[0]) {
+    if ($audioTransceiver?.receiver?.track) {
-        $remoteMediaStream.getAudioTracks()[0].enabled = !$remoteMediaStream?.getAudioTracks()[0]?.enabled
+        $audioTransceiver.receiver.track.enabled = !$audioTransceiver.receiver.track.enabled
     }
 }
 
-export function callIsRemoteAudioMuted () {
+export function callMuteRemote () {
-    return !$remoteMediaStream?.getAudioTracks()[0]?.enabled
+    if ($audioTransceiver?.receiver?.track) {
+        $audioTransceiver.receiver.track.enabled = false
+    }
 }
 
-export function callEnd () {
+export function callUnMuteRemote () {
-    if ($outgoingRtcSession && !$outgoingRtcSession.isEnded()) {
+    if ($audioTransceiver?.receiver?.track) {
-        $outgoingRtcSession.terminate(TERMINATION_OPTIONS)
+        $audioTransceiver.receiver.track.enabled = true
-        $outgoingRtcSession = null
     }
-    if ($incomingRtcSession && !$incomingRtcSession.isEnded()) {
+}
-        $incomingRtcSession.terminate(TERMINATION_OPTIONS)
+
-        $incomingRtcSession = null
+/**
+ * Checks whether remote audio is muted or not.
+ * @returns {boolean}
+ */
+export function callIsRemoteMuted () {
+    return !$audioTransceiver?.receiver?.track?.enabled
+}
+
+/**
+ * Terminates the call if not ended and cleans up all related resources.
+ */
+export function callEnd () {
+    const rtcSession = callGetRtcSession()
+    if (rtcSession && !rtcSession.isEnded()) {
+        rtcSession.terminate(TERMINATION_OPTIONS)
     }
+    try {
         if ($localMediaStream) {
             $localMediaStream.getTracks().forEach(track => track.stop())
+        }
+    } finally {
         $localMediaStream = null
     }
+    try {
         if ($remoteMediaStream) {
             $remoteMediaStream.getTracks().forEach(track => track.stop())
+        }
+    } finally {
         $remoteMediaStream = null
     }
+    $outgoingRtcSession = null
+    $incomingRtcSession = null
+    $audioTransceiver = null
+    $videoTransceiver = null
 }

src/boot/ngcp-call.js

@@ -1,19 +1,16 @@
 
-import {
-    v4
-} from 'uuid'
 import _ from 'lodash'
 import {
     callConfigure,
-    callEnd,
     callEvent,
     callHasLocalCamera,
     callHasLocalScreen,
     callHasRemoteVideo,
-    callIsMuted,
+    callMute,
-    callIsRemoteAudioMuted
+    callMuteRemote,
+    callUnMute,
+    callUnMuteRemote
 } from 'src/api/ngcp-call'
-import { errorVisibilityTimeout } from 'src/store/call/common'
 
 export default async ({ Vue, app, store }) => {
     callConfigure({
@@ -25,19 +22,21 @@ export default async ({ Vue, app, store }) => {
         if (reason?.text) {
             cause = reason.text
         }
-        if (event.originator !== 'local') {
+        store.dispatch('call/end', { cause })
-            callEnd()
-            store.commit('call/endCall', cause)
-            setTimeout(() => {
-                store.commit('call/inputNumber')
-            }, errorVisibilityTimeout)
-        }
     }
     callEvent.on('connected', () => {
         store.commit('call/enableCall')
     })
-    callEvent.on('disconnected', () => {
+    callEvent.on('disconnected', ({ error, code }) => {
-        store.commit('call/disableCall')
+        let errorMessage = null
+        if (error) {
+            errorMessage = app.i18n.t('WebSocket connection to kamailio lb failed with code {code}', {
+                code: code
+            })
+        }
+        store.commit('call/disableCall', {
+            error: errorMessage
+        })
     })
     callEvent.on('outgoingProgress', (event) => {
         store.commit('call/startRinging')
@@ -51,17 +50,25 @@ export default async ({ Vue, app, store }) => {
             number: _.get(session, 'remote_identity.uri.user', 'Unknown')
         })
     })
-    callEvent.on('localStream', () => {
+    callEvent.on('localStream', (stream) => {
-        store.commit('call/toggleMicrophone', !callIsMuted())
+        if (store.state.call.microphoneEnabled) {
+            callUnMute()
+        } else {
+            callMute()
+        }
+        store.commit('call/localMediaSuccess', stream.id)
     })
-    callEvent.on('remoteStream', () => {
+    callEvent.on('remoteStream', (stream) => {
+        if (store.state.call.remoteAudioEnabled) {
+            callUnMuteRemote()
+        } else {
+            callMuteRemote()
+        }
         store.commit('call/establishCall', {
-            mediaStreamId: v4(),
+            mediaStreamId: stream.id,
-            isLocalAudioMuted: callIsMuted(),
             hasLocalCamera: callHasLocalCamera(),
             hasLocalScreen: callHasLocalScreen(),
-            hasRemoteVideo: callHasRemoteVideo(),
+            hasRemoteVideo: callHasRemoteVideo()
-            isRemoteAudioMuted: callIsRemoteAudioMuted()
         })
     })
 }

src/components/CscInlineAlert.vue

@@ -2,7 +2,11 @@
     <q-banner
         :class="bannerClasses"
         inline-actions
+        rounded
+        v-bind="$attrs"
+        v-on="$listeners"
     >
+        <slot />
         <template
             v-if="icon !== null && icon !== undefined"
             v-slot:avatar
@@ -13,7 +17,6 @@
                 size="24px"
             />
         </template>
-        <slot />
         <template
             v-slot:action
         >
@@ -39,7 +42,7 @@ export default {
     },
     computed: {
         bannerClasses () {
-            return ['text-dark', 'bg-' + this.color]
+            return ['text-weight-bold', 'text-dark', 'bg-' + this.color, 'content-start']
         }
     }
 }

src/components/CscInlineAlertAlert.vue

@@ -1,6 +1,6 @@
 <template>
     <csc-inline-alert
-        icon="alert"
+        icon="error"
         color="negative"
         v-bind="$attrs"
         v-on="$listeners"

src/i18n/en.json

@@ -471,6 +471,7 @@
     "We": "We",
     "Web Password": "Web Password",
     "Web Password confirm": "Web Password confirm",
+    "WebSocket connection to kamailio lb failed with code {code}": "WebSocket connection to kamailio lb failed with code {code}",
     "Wednesday": "Wednesday",
     "Weekly": "Weekly",
     "When I dial {slot} ...": "When I dial {slot} ...",

src/pages/CscPageHome.vue

@@ -6,12 +6,19 @@
         <div
             class="col-xs-10 col-sm-8 col-md-4 csc-opt-center"
         >
+            <csc-inline-alert-alert
+                v-if="connectionError"
+                class="q-mb-md"
+            >
+                {{ connectionError }}
+            </csc-inline-alert-alert>
             <csc-input
                 id="csc-call-number-input"
                 :label="$t('Enter a number to dial')"
                 :value="callNumberInput"
                 :readonly="dialpadOpened"
                 clearable
+                :disable="!isCallEnabled"
                 @keypress.space.prevent
                 @keydown.space.prevent
                 @keyup.space.prevent
@@ -47,6 +54,7 @@ import {
 import CscCallDialpad from 'components/CscCallDialpad'
 import CscPage from 'components/CscPage'
 import CscInput from 'components/form/CscInput'
+import CscInlineAlertAlert from 'components/CscInlineAlertAlert'
 
 export default {
     name: 'CscPageHome',
@@ -56,6 +64,7 @@ export default {
         }
     },
     components: {
+        CscInlineAlertAlert,
         CscInput,
         CscPage,
         CscCallDialpad
@@ -75,7 +84,8 @@ export default {
             'callNumberInput',
             'isCallEnabled',
             'callStateTitle',
-            'callStateSubtitle'
+            'callStateSubtitle',
+            'connectionError'
         ]),
         dialpadOpened () {
             return this.callState === 'input' && this.isMobile

src/store/call/actions.js

@@ -11,8 +11,13 @@ import {
     callIsMuted,
     callSendDTMF,
     callToggleRemoteAudio,
-    callIsRemoteAudioMuted, callHasLocalScreen, callHasLocalCamera
+    callIsRemoteMuted,
+    callHasLocalScreen,
+    callHasLocalCamera
 } from 'src/api/ngcp-call'
+import { errorVisibilityTimeout } from 'src/store/call/common'
+
+let errorVisibilityTimer = null
 
 export default {
     async start (context, localMedia) {
@@ -37,6 +42,10 @@ export default {
         callToggleMicrophone()
         context.commit('toggleMicrophone', !callIsMuted())
     },
+    toggleRemoteAudio (context) {
+        callToggleRemoteAudio()
+        context.commit('toggleRemoteAudio', !callIsRemoteMuted())
+    },
     async toggleCamera (context) {
         if (!callHasLocalVideo() || callHasLocalScreen()) {
             await callAddCamera()
@@ -46,7 +55,6 @@ export default {
             await callRemoveVideo()
             context.commit('disableVideo')
         }
-        context.commit('localMediaSuccess', callGetLocalMediaStreamId())
     },
     async toggleScreen (context) {
         if (!callHasLocalVideo() || callHasLocalCamera()) {
@@ -57,17 +65,24 @@ export default {
             await callRemoveVideo()
             context.commit('disableVideo')
         }
-        context.commit('localMediaSuccess', callGetLocalMediaStreamId())
     },
-    end (context) {
+    end (context, options = { cause: null }) {
         callEnd()
+        if (!options.cause) {
+            if (errorVisibilityTimer) {
+                clearTimeout(errorVisibilityTimer)
+            }
+            context.commit('endCall')
+            context.commit('hangUpCall')
+        } else if (options.cause && !errorVisibilityTimer) {
+            context.commit('endCall', options.cause)
+            errorVisibilityTimer = setTimeout(() => {
                 context.commit('hangUpCall')
+                errorVisibilityTimer = null
+            }, errorVisibilityTimeout)
+        }
     },
     sendDTMF (context, tone) {
         callSendDTMF(tone)
-    },
-    toggleRemoteAudio (context) {
-        callToggleRemoteAudio()
-        context.commit('toggleRemoteAudio', !callIsRemoteAudioMuted())
     }
 }

src/store/call/getters.js

@@ -134,5 +134,8 @@ export default {
         } else {
             return ''
         }
+    },
+    connectionError (state) {
+        return state.connectionError
     }
 }

src/store/call/mutations.js

@@ -30,18 +30,14 @@ export default {
     },
     establishCall (state, {
         mediaStreamId,
-        isLocalAudioMuted = false,
         hasLocalCamera = false,
         hasLocalScreen = false,
-        hasRemoteVideo = false,
+        hasRemoteVideo = false
-        isRemoteAudioMuted = false
     }) {
-        state.remoteMediaStream = mediaStreamId
         state.callState = CallState.established
-        state.microphoneEnabled = !isLocalAudioMuted
+        state.remoteMediaStream = mediaStreamId
         state.cameraEnabled = hasLocalCamera
         state.screenEnabled = hasLocalScreen
-        state.remoteAudioEnabled = !isRemoteAudioMuted
         state.remoteVideoEnabled = hasRemoteVideo
     },
     incomingCall (state, options) {
@@ -52,37 +48,36 @@ export default {
         state.endedReason = null
     },
     hangUpCall (state) {
+        if (state.callState !== CallState.input) {
             state.callState = CallState.input
             state.number = ''
             state.numberInput = ''
             state.endedReason = null
+        }
     },
     endCall (state, reason) {
-        if (state.endedReason === null) {
+        if (reason) {
             state.callState = CallState.ended
             state.endedReason = reason
+        }
+        state.dialpadOpened = false
+        state.microphoneEnabled = true
+        state.cameraEnabled = false
+        state.screenEnabled = false
+        state.remoteAudioEnabled = true
+        state.remoteVideoEnabled = false
         state.localMediaStream = null
         state.remoteMediaStream = null
-        }
-    },
-    sendDTMF (state, value) {
-        state.dtmf = value
     },
     toggleMicrophone (state, enabled) {
         state.microphoneEnabled = enabled
     },
-    setCamera (state, enabled) {
-        state.cameraEnabled = enabled
-    },
     enableCamera (state) {
         state.cameraEnabled = true
     },
     enableScreen (state) {
         state.screenEnabled = true
     },
-    setScreen (state, enabled) {
-        state.screenEnabled = enabled
-    },
     disableVideo (state) {
         state.cameraEnabled = false
         state.screenEnabled = false
@@ -103,8 +98,10 @@ export default {
     },
     enableCall (state) {
         state.callEnabled = true
+        state.connectionError = null
     },
-    disableCall (state) {
+    disableCall (state, options = { error: null }) {
         state.callEnabled = false
+        state.connectionError = options.error
     }
 }

src/store/call/state.js

@@ -4,6 +4,7 @@ import {
 } from 'src/store/call/common'
 
 export default {
+    connectionError: null,
     callEnabled: false,
     endedReason: null,
     callState: CallState.input,