From d007dbec5d44963b4650baf9668389ec7da944f3 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Sun, 18 Oct 2026 23:19:11 -0700
Subject: A voice call can turn video: Turn on camera in the call's bar puts
 your camera in (a renegotiation, NIP-AC's kind 25055); the other side sees
 you at once and gets the same button for theirs. The call's sound carries on
 throughout.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013ZDf1cyCQLkfjftYhymZAg
---
 src/calls.js | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

(limited to 'src/calls.js')

diff --git a/src/calls.js b/src/calls.js
index 6f18aec..e95b975 100644
--- a/src/calls.js
+++ b/src/calls.js
@@ -251,6 +251,32 @@ export function createCalls(env) {
     for (const t of call.local.getVideoTracks()) t.enabled = !on;
     changed();
   }
+  // A voice call turned video: our camera into the call, by a new offer
+  // (NIP-AC's renegotiate). Into the video transceiver their camera already
+  // came by if there is one, else a new one. The other side sees us at once
+  // and gets the same button for theirs.
+  async function addVideo() {
+    const c = call;
+    if (!c || c.state !== 'connected' || !c.pc || !c.local || c.local.getVideoTracks().length) return;
+    try {
+      const fresh = await env.media('video-only', c.facing);
+      const track = fresh.getVideoTracks()[0];
+      if (call !== c || c.state !== 'connected') { track.stop(); return; }
+      // a new stream object, so the preview picks the camera up
+      c.local = new MediaStream([...c.local.getTracks(), track]);
+      const tr = c.pc.getTransceivers().find((x) => !x.stopped && !x.sender.track && x.receiver.track && x.receiver.track.kind === 'video');
+      if (tr) { await tr.sender.replaceTrack(track); tr.direction = 'sendrecv'; try { tr.sender.setStreams && tr.sender.setStreams(c.local); } catch {} }
+      else c.pc.addTrack(track, c.local);
+      c.type = 'video'; c.camOff = false;
+      changed();
+      await renegotiate(c);
+    } catch {}
+  }
+  async function renegotiate(c) {
+    c.renegotiating = true;
+    await c.pc.setLocalDescription(await c.pc.createOffer());
+    await sendFor(c, CALL.RENEGOTIATE, c.peer, c.pc.localDescription.sdp);
+  }
   // the other camera: the sender's track swapped, no new offer needed
   async function flip() {
     const c = call;
@@ -357,6 +383,8 @@ export function createCalls(env) {
           await c.pc.setRemoteDescription({ type: 'offer', sdp: ev.content });
           await c.pc.setLocalDescription(await c.pc.createAnswer());
           await sendFor(c, CALL.ANSWER, c.peer, c.pc.localDescription.sdp);
+          // they turned their camera on: this is a video call now
+          if (c.type !== 'video' && /^m=video [1-9]/m.test(ev.content)) { c.type = 'video'; changed(); }
         } catch {}
         return;
       }
@@ -365,7 +393,7 @@ export function createCalls(env) {
 
   return {
     get call() { return call; },
-    start, accept, reject, hangup, setMuted, setCamOff, flip, handle,
+    start, accept, reject, hangup, setMuted, setCamOff, flip, addVideo, handle,
     // a sign-out or account switch: whatever was going on ends here
     stop() { if (call && call.state !== 'ended') hangup(); call = null; early.clear(); },
   };
-- 
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