restore browser video codec defaults

README.md

@@ -24,6 +24,8 @@ PORT=8081 npm start
   and periodic packet-loss, jitter, and RTT quality diagnostics.
 - Audio input has manual gain control and a live signal/clipping meter in the
   settings dialog; microphone processing is split into `public/audio-manager.js`.
+- Screen sharing uses the browser's default codec negotiation, with selectable
+  `detail` (text/UI) or `motion` (gameplay) content hints.
 
 ## ICE configuration (server side)
 

public/app.js

@@ -37,6 +37,7 @@ const FALLBACK_ICE = { iceServers: [{ urls: ['stun:turn.k6n.net:3478', 'stun:stu
 const LS_NAME = 'voicepoc.nick';
 const LS_ICE = 'voicepoc.iceOverride';
 const LS_AUDIO_INPUT = 'voicepoc.audioInput';
+const LS_SCREEN_HINT = 'voicepoc.screenHint';
 
 const S = {
   ws: null,
@@ -159,26 +160,6 @@ function preferOpus(pc) {
   }
 }
 
-function preferH264(pc) {
-  const capabilities = globalThis.RTCRtpReceiver?.getCapabilities?.('video');
-  const codecs = capabilities?.codecs || [];
-  const rank = (codec) => {
-    const mime = codec.mimeType?.toLowerCase() || '';
-    if (mime === 'video/h264') return 0;
-    if (mime === 'video/vp8') return 1;
-    if (mime === 'video/vp9') return 2;
-    return 3;
-  };
-  const ordered = [...codecs].sort((a, b) => rank(a) - rank(b));
-  for (const transceiver of pc.getTransceivers()) {
-    if (transceiver.receiver?.track?.kind === 'video' || transceiver.sender?.track?.kind === 'video') {
-      try { transceiver.setCodecPreferences(ordered); } catch (err) {
-        captureRumIssue('Could not prefer H.264 video codec', 'WARNING', { error: err?.message || String(err) });
-      }
-    }
-  }
-}
-
 function monitorPeerQuality(peer) {
   if (peer.qualityTimer) clearInterval(peer.qualityTimer);
   peer.qualityTimer = setInterval(async () => {
@@ -1035,6 +1016,8 @@ async function startScreenShare() {
   for (const peer of S.peers.values()) addScreenToPeer(peer);
   const videoTrack = stream.getVideoTracks()[0];
   if (videoTrack) {
+    const screenHint = localStorage.getItem(LS_SCREEN_HINT) || '';
+    if ('contentHint' in videoTrack) videoTrack.contentHint = screenHint;
     videoTrack.addEventListener('ended', () => stopScreenShare(stream));
   }
   renderScreens();
@@ -1057,7 +1040,6 @@ function addScreenToPeer(peer) {
     }
     peerSenders.set(streamId, senders);
   }
-  preferH264(peer.pc);
   S.screenSenders.set(peer.id, peerSenders); // renegotiation fires automatically
 }
 
@@ -2199,6 +2181,8 @@ function openSettings() {
   const gain = $('#mic-gain');
   if (gain) gain.value = S.audioManager.gain;
   updateMicGainUi();
+  const screenHint = $('#screen-hint');
+  if (screenHint) screenHint.value = localStorage.getItem(LS_SCREEN_HINT) || '';
   const override = localStorage.getItem(LS_ICE);
   $('#override-enabled').checked = !!override;
   const current = override ? JSON.parse(override) : effectiveIce();
@@ -2220,6 +2204,10 @@ $('#mic-gain').oninput = (ev) => {
   S.audioManager.setGain(ev.target.value);
   updateMicGainUi();
 };
+$('#screen-hint').onchange = (ev) => {
+  localStorage.setItem(LS_SCREEN_HINT, ev.target.value);
+  toast('Screen-share hint saved — applies next time you share', 'ok');
+};
 $('#audio-input').onchange = (ev) => switchAudioInput(ev.target.value);
 $('#ice-cancel').onclick = () => $('#modal-backdrop').classList.add('hidden');
 $('#modal-backdrop').onclick = (ev) => {

public/index.html

@@ -150,6 +150,14 @@
     </div>
     <p id="mic-clipping" class="hint hidden">Clipping detected — reduce microphone gain.</p>
     <p class="hint">Changes apply immediately when connected, or the next time you join.</p>
+    <h3>Screen sharing</h3>
+    <label class="field-label" for="screen-hint">Optimization</label>
+    <select id="screen-hint" class="settings-select">
+      <option value="">Browser default</option>
+      <option value="detail">Details / text editor / terminal</option>
+      <option value="motion">Gameplay / motion</option>
+    </select>
+    <p class="hint">Details favors sharp text; motion favors smoother movement.</p>
     <p class="hint">Overrides the server-provided ICE configuration (stored in <code>localStorage</code>, applied on next join).</p>
     <label class="toggle-row">
       <input type="checkbox" id="override-enabled" />