video attachments from camera

nodejs/public/javascripts/mediarecorder.js

@@ -0,0 +1,176 @@
+/// @class MediaRecorder
+/** Provides a recorder to record fotos, audio and video from a web
+    browser client using the JavaScript getUserMedia feature.
+
+    @param constraints The constraints as JSON data:
+           @code
+           {
+             video: true, // true if you want to record video
+             audio: true  // true if you want to record audio
+           }
+           @endcode
+           You can record video or audio only or both together.
+           if not specified, defaults to @ref defaultconstraints.
+
+    @note Special thanks to the following projects:
+     - For the basics regarding getUserMedia:
+       http://www.html5rocks.com/en/tutorials/getusermedia/intro/
+     - For a simple example of a media recorder:
+       https://github.com/samdutton/simpl/blob/gh-pages/mediarecorder
+
+    @note Supported browsers are:
+     - Firefox 29 or later
+     - Chrome 47 or later, with @c "Enable experimental Web Platform
+       features" enabled from @c "chrome://flags"
+
+    @note This class must be used from within a secure context. A
+    secure context is an encrypted SSL connection through HTTPS, or
+    the special address @c localhost.
+
+    @todo Why are mediaSource and sourceBuffer needed? They are not
+          further referenced.
+*/
+function MediaStreamRecorder(constraints) {
+
+    /// @name private variables
+    ///@{
+    var events = [];
+    var mediaSource = new MediaSource();
+    var stream;
+    var mediaRecorder;
+    var recordedBlobs = [];
+    var sourceBuffer;
+    var defaultconstraints = {
+        audio: true,
+        video: true
+    };
+    ///@}
+    
+    /// @name internal event handlers
+    ///@{
+
+    /// Create Source Buffer on Event Source Open
+    function handleSourceOpen(event) {
+        sourceBuffer = mediaSource.addSourceBuffer('video/webm; codecs="vp8"');
+    }
+
+    /// Store Data in local Binary Large Object
+    function handleDataAvailable(event) {
+        if (event.data && event.data.size > 0) {
+            recordedBlobs.push(event.data);
+        }
+    }
+
+    /// Propagate @c ready Event to Registered Handler
+    function handleReady() {
+        if (events['ready']) events['ready']();
+    }
+
+    /// Propagate @c start Event to Registered Handler
+    function handleStart() {
+        if (events['stop']) events['start']();
+    }
+
+    /// Propagate @c stop Event to Registered Handler
+    function handleStop(event) {
+        if (events['stop']) events['stop'](event);
+    }
+
+    ///@}
+
+    /// @name public methods
+    ///@{
+
+    /// Register Eventhandler
+    /** @param eventname The following events are available:
+          - @c ready Video preview stream is ready for use
+          - @c stop Recording has stopped, parameter: @event
+          - @c start Recording has started
+          
+        @param eventhandler callback function to be called when the
+               event occurs.
+    */
+    this.on = function(eventname, eventhandler) {
+        events[eventname] = eventhandler;
+    }
+
+    /// Get Stream to the Preview
+    /** @return Stream prepared to be used in a HTML @c src attribute
+                within a @c audio or @c video tag. */
+    this.preview = function() {
+        return window.URL ? window.URL.createObjectURL(stream) : stream;
+    }
+
+    /// Get Stream to the Recording
+    /** @return Stream prepared to be used in a HTML @c src attribute
+                within a @c audio or @c video tag, or to be used in a
+                HTML @c href attribute in a @c a tag for downloading
+                the recording. */
+    this.recording = function() {
+        var buff = new Blob(recordedBlobs, {type: 'video/webm'});
+        return window.URL ? window.URL.createObjectURL(buff) : buff;
+    }
+
+    /// Start Stream Recording
+    /** @throws Exception if browser is not supported */
+    this.start = function() {
+        // The nested try blocks will be simplified when Chrome 47 moves to Stable
+        var options = {mimeType: 'video/webm'};
+        recordedBlobs = [];
+        try {
+            mediaRecorder = new MediaRecorder(stream, options);
+        } catch (e0) {
+            try {
+                options = {mimeType: 'video/webm,codecs=vp9'};
+                mediaRecorder = new MediaRecorder(stream, options);
+            } catch (e1) {
+                try {
+                    options = 'video/vp8'; // Chrome 47
+                    mediaRecorder = new MediaRecorder(stream, options);
+                } catch (e2) {
+                    throw {
+                        text: 'MediaRecorder is not supported by browser',
+                        e0: e0,
+                        e1: e1,
+                        e2: e2
+                    };
+                }
+            }
+        }
+        mediaRecorder.onstop = handleStop;
+        mediaRecorder.ondataavailable = handleDataAvailable;
+        mediaRecorder.start(10); // collect 10ms of data
+        handleStart();
+    }
+
+    /// Stop Stream Recording
+    /** Use recording() to get access to the result. */
+    this.stop = function () {
+        if (mediaRecorder) mediaRecorder.stop();
+        delete mediaRecorder; mediaRecorder = null;
+    }
+
+    /// Close Preview Stream
+    /** Closes the stream and releases the camera. This should always
+        be called to cleanup, when the camera is no more needed. */
+    this.release = function() {
+        stop();
+        stream.getTracks().forEach(function(track) {track.stop()});
+        delete stream; stream = null;
+    }
+
+    ///@}
+
+    /// @name initialization
+    ///@{
+    mediaSource.addEventListener('sourceopen', handleSourceOpen, false);
+    if (!constraints) constraints = defaultconstraints;
+    navigator.mediaDevices.getUserMedia(constraints)
+        .then(function(s) {
+            stream = s;
+            handleReady();
+        }).catch(function(error) {
+            throw error;
+        });
+    ///@}
+}

nodejs/public/javascripts/safechat.js

@@ -343,67 +343,72 @@ function guessfilename(mimetype, user, date) {
 function attachments(files, id, from, date) {
     if (files) files.forEach(function(file) {
         if (!file.name) file.name = guessfilename(file.type, from, date);
+        var a = document.createElement('a');
+        a.href = file.content;
+        a.download = file.name;
+        a.target = '_blank';
+        if (file.type.match('^image/')) {
             var img = document.createElement('img');
             img.title = file.name;
-        if (file.type.match('^image/')) {
             img.src = file.content;
+            a.appendChild(img);
+        } else if (file.type.match('^video/')) {
+            var video = document.createElement('video');
+            video.controls = true;
+            video.title = file.name;
+            video.src = file.content;
+            a.appendChild(video);
         } else {
+            var img = document.createElement('img');
+            img.title = file.name;
             img.src = "images/Document_sans_PICOL-PIctorial-COmmunication-Language.svg";
-        }
-        var a = document.createElement('a');
-        a.href = file.content;
-        a.download = file.name;
-        a.target = '_blank';
             a.appendChild(img);
+        }
         $(id).append(a);            
     });
 }
 
-// function getUserMedia() {
-//     return navigator.mediaDevices.getUserMedia || navigator.getUserMedia
-//         || navigator.webkitGetUserMedia || navigator.mozGetUserMedia
-//         || navigator.msGetUserMedia;
-// }
+var recorder;
 
-var mediarecorder = null;
-var mediastream = null;
-function record() {
-    mediarecorder = mediastream.record();
-}
 function done() {
-    mediarecorder.getRecordedData(function(videoblob) {
-        previewfile(videoblob, "video/webm");
-    });
-    mediarecorder = null;
+    if (recorder) {
+        recorder.stop();
+        previewfile(recorder.recording(), "video/webm");
+        abort();
+    }
 }
 
 function abort() {
-    mediarecorder = null;
-    mediastream.getTracks().forEach(function(track) {track.stop()});
-    mediastream = null;
+    if (recorder) {
+        $("#videorecorder").hide();
+        recorder.release();
+        delete recorder; recorder = null;
+    }
 }
 
 /// Record Video from builtin camera
 function recordvideo() {
-    $("#videorecorder").show();
-    if (mediastream) {
-        mediarecorder = mediastream.record();
-    }
     try {
-        navigator.mediaDevices.getUserMedia({audio: true, video: true})
-            .then(function(stream) {
-                console.log(stream);
-                mediastream = stream;
-                var video = $("#videorecorder video");
-                video.attr("src", window.URL.createObjectURL(mediastream));
-            }).catch(function() {
-                error("capture video failed", false);
+        abort();
+        $("#videorecorder").show();
+        recorder = new MediaStreamRecorder({
+            video: {
+                mandatory: {
+                    maxWidth: 400,
+                    maxHeight: 400
+                }
+            },
+            audio: true
+        });
+        recorder.on("ready", function() {
+            $("#videorecorder video").attr("src", recorder.preview());
+            recorder.start();
         });
+        recorder.on('')
     } catch (e) {
         console.log(e);
         error("cannot access camera", true);
     }
-
 }
 
 function previewfile(content, type, name) {
@@ -440,6 +445,7 @@ function previewfile(content, type, name) {
         filecontent.push({name: name, type: type, content: content});
         var video = document.createElement("video");
         video.setAttribute("controls", "controls");
+        video.setAttribute("loop", "loop");
         video.setAttribute("src", content);
         video.setAttribute("title", name);
         $("#preview").append(video);

nodejs/public/stylesheets/safechat.css

@@ -255,6 +255,21 @@ label[for=send] img {
   width: 100%;
 }
 
-#preview img {
+#msgs .msg .text video {
+  border-radius: 2ex;
+  -moz-border-radius: 2ex;
+  -webkit-border-radius: 2ex;
+  display: block;
+  width: 100%;
+}
+
+#videorecorder {
+  max-width: 100%;
+  width: auto;
+  height: auto;
+  text-align: center;
+}
+
+#preview img, #preview video {
   height: 4em;
 }

nodejs/views/index.ejs

@@ -7,6 +7,7 @@
     <script type="text/javascript" src="javascripts/jquery.js"></script>
     <script type="text/javascript" src="javascripts/openpgp.js"></script>
     <script type="text/javascript" src="/socket.io/socket.io.js"></script>
+    <script type="text/javascript" src="javascripts/mediarecorder.js"></script>
     <script type="text/javascript" src="javascripts/safechat.js"></script>
     <link href="stylesheets/jquery.cssemoticons.css" media="screen" rel="stylesheet" type="text/css" />
     <script src="javascripts/jquery.cssemoticons.js" type="text/javascript"></script>
@@ -143,13 +144,12 @@
               </span>
             </div>
           </form>
-          <div id="preview"></div>
           <div id="videorecorder" style="display: none">
-            <video autoplay muted></video>
-            <button id="record" onclick="record()">record</button>
+            <video autoplay muted></video><br/>
             <button id="done" onclick="done()">done</button>
             <button id="abort" onclick="abort()">abort</button>
           </div>
+          <div id="preview"></div>
         </div>
         <div id="msgs"></div>
         <script>