Nicer media option handling

pico.css

 }
 video {
     width: 120px;
-    transform: scaleX(-1);
     background-color: black;
 }
+video.mirrored {
+    transform: scaleX(-1);
+}

pico.js

 const scrollIntoView = (vnode) => {
     vnode.dom.scrollIntoView()
 }
+const toggleFullscreen = (el) => (event) => {
+    document.fullscreenElement ? document.exitFullscreen() : el.requestFullscreen()
+}
 const prettyTime = (ts) => {
     const dt = new Date(ts)
     const H = `0${dt.getHours()}`.slice(-2)
         dom.autoplay = true
         dom.muted = (username === State.username)
         dom.srcObject = stream
+        dom.ondblclick = toggleFullscreen(dom)
     },
     view({attrs}) {
         const rpc = State.rpcs[attrs.username] || {iceConnectionState: m.trust(' ')}
         return m('.video-container',
             m('.video-source', attrs.username),
             m('.video-state', rpc.iceConnectionState),
-            m('video', {playsinline: true, oncreate: Video.appendStream(attrs)}),
+            m('video.mirrored', {playsinline: true, oncreate: Video.appendStream(attrs)}),
         )
     },
 }
+const audio = {
+    noiseSuppresion: true,
+    echoCancellation: true,
+}
 const Media = {
-    audioVideo: {audio: true, video: {width: {ideal: 320}, facingMode: 'user'}},
-    audioOnly: {audio: true, video: false},
-    turnOn: (constraints) => async () => {
+    options: {
+        video: {audio, video: {width: {ideal: 320}, facingMode: 'user'}},
+        audio: {audio, video: false},
+        screen: {audio, video: {mediaSource: 'screen'}},
+        none: {audio: false, video: false},
+    },
+    turnOn: async () => {
+        const constraints = Media.options[document.querySelector('#media-source').value]
         const media = await navigator.mediaDevices.getUserMedia(constraints)
         State.media[State.username] = media
         wire({kind: 'peerInfo', value: {type: 'request'}})
     view() {
         if(!State.media[State.username]) {
             return m('.media',
-                m('button', {onclick: Media.turnOn(Media.audioVideo)}, 'turn media on'),
-                m('button', {onclick: Media.turnOn(Media.audioOnly)}, 'turn audio on'),
+                m('button', {onclick: Media.turnOn}, 'turn on'),
+                m('select#media-source',
+                    Object.keys(Media.options).map(description => m('option', description)),
+                ),
             )
         }
         else {
             return m('.media',
-                m('button', {onclick: Media.turnOff}, 'turn media off'),
+                m('button', {onclick: Media.turnOff}, 'turn off'),
                 m('.videos',
                     Object.entries(State.media).map(([username, stream]) =>
                         m(Video, {username, stream})