From 4988c8fea81261d342318921ba3497723c353dd9 Mon Sep 17 00:00:00 2001
From: Pierre HUBERT <pierre.git@communiquons.org>
Date: Tue, 21 Apr 2020 13:26:58 +0200
Subject: [PATCH] Get user media

---
 lib/ui/screens/call_screen.dart | 114 +++++++++++++++++++++++++++++---
 1 file changed, 103 insertions(+), 11 deletions(-)

diff --git a/lib/ui/screens/call_screen.dart b/lib/ui/screens/call_screen.dart
index 285f6a2..edfc303 100644
--- a/lib/ui/screens/call_screen.dart
+++ b/lib/ui/screens/call_screen.dart
@@ -45,6 +45,10 @@ class _CallScreenState extends SafeState<CallScreen> {
   UsersList _usersList;
   final _peersConnections = Map<int, RTCPeerConnection>();
   final _renderers = Map<int, RTCVideoRenderer>();
+  MediaStream _localStream;
+
+  bool get isStreamingVideo =>
+      _localStream != null && _localStream.getVideoTracks().length > 0;
 
   @override
   void initState() {
@@ -130,12 +134,15 @@ class _CallScreenState extends SafeState<CallScreen> {
   /// Do clean up operations when call screen is destroyed
   void _endCall() async {
     try {
-      // Leave the call
-      await CallsHelper.leave(convID);
-
       // Close all ready members
       for (final member in _membersList.readyPeers)
         await _removeMember(member.userID);
+
+      // Close local stream
+      await _stopStreaming();
+
+      // Leave the call
+      await CallsHelper.leave(convID);
     } catch (e, stack) {
       print("Could not end call properly! $e\n$stack");
     }
@@ -151,6 +158,53 @@ class _CallScreenState extends SafeState<CallScreen> {
     MainController.of(context).popPage();
   }
 
+  /// Start streaming on our end
+  Future<void> _startStreaming(bool includeVideo) async {
+    try {
+      await _stopStreaming();
+
+      // Request user media
+      _localStream = await navigator.getUserMedia({
+        "audio": true,
+        "video": !includeVideo
+            ? false
+            : {
+                "mandatory": {
+                  "maxWidth": '320',
+                  "maxHeight": '240',
+                  "minFrameRate": '24',
+                },
+                "facingMode": "user",
+                "optional": [],
+              }
+      });
+
+      // Start renderer
+      _renderers[userID()] = RTCVideoRenderer();
+      await _renderers[userID()].initialize();
+      _renderers[userID()].srcObject = _localStream;
+      setState(() {});
+    } catch (e, stack) {
+      print("Could not start streaming! $e\n$stack");
+      showSimpleSnack(context, tr("Could not start streaming!"));
+    }
+  }
+
+  /// Stop local streaming
+  Future<void> _stopStreaming() async {
+    // Stop local stream
+    if (_localStream != null) {
+      await _localStream.dispose();
+      _localStream = null;
+    }
+
+    // Close renderer
+    if (_renderers.containsKey(userID())) {
+      await _renderers[userID()].dispose();
+      _renderers.remove(userID());
+    }
+  }
+
   /// Call this when a user started to stream media
   Future<void> _memberReady(int memberID) async {
     try {
@@ -170,7 +224,8 @@ class _CallScreenState extends SafeState<CallScreen> {
       _peersConnections[memberID] = peerConnection;
 
       // Create a renderer
-      _renderers[memberID] = RTCVideoRenderer()..initialize();
+      _renderers[memberID] = RTCVideoRenderer()
+        ..initialize(); // TODO Use await instead for initialize
 
       // Register callbacks
       peerConnection.onIceCandidate =
@@ -305,10 +360,19 @@ class _CallScreenState extends SafeState<CallScreen> {
   /// Videos area
   Widget _buildVideosArea() {
     return Expanded(
-        child: Column(
-      children: _membersList.readyPeers
-          .map((f) => _buildMemberVideo(f.userID))
-          .toList(),
+        child: Stack(
+      fit: StackFit.expand,
+      children: [
+        // Remove peers videos
+        Column(
+          children: _membersList.readyPeers
+              .map((f) => _buildMemberVideo(f.userID))
+              .toList(),
+        ),
+
+        // Local peer video
+        isStreamingVideo ? _buildLocalVideo() : Container(),
+      ],
     ));
   }
 
@@ -316,6 +380,16 @@ class _CallScreenState extends SafeState<CallScreen> {
     return Expanded(child: RTCVideoView(_renderers[peerID]));
   }
 
+  Widget _buildLocalVideo() {
+    return Positioned(
+      child: RTCVideoView(_renderers[userID()]),
+      height: 50,
+      width: 50,
+      right: 10,
+      bottom: 10,
+    );
+  }
+
   /// Footer area
   Widget _buildFooterArea() {
     return Material(
@@ -323,10 +397,28 @@ class _CallScreenState extends SafeState<CallScreen> {
       child: Row(
         mainAxisAlignment: MainAxisAlignment.center,
         children: <Widget>[
+          // Toggle audio button
+          Expanded(
+            child: IconButton(
+              icon: Icon(Icons.mic_off),
+              onPressed: () => _startStreaming(false),
+            ),
+          ),
+
           // Hang up call
-          IconButton(
-            icon: Icon(Icons.phone, color: Colors.red),
-            onPressed: () => _leaveCall(),
+          Expanded(
+            child: IconButton(
+              icon: Icon(Icons.phone, color: Colors.red),
+              onPressed: () => _leaveCall(),
+            ),
+          ),
+
+          // Toggle video button
+          Expanded(
+            child: IconButton(
+              icon: Icon(Icons.videocam_off),
+              onPressed: () => _startStreaming(true),
+            ),
           ),
         ],
       ),