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annotate dictation/web/dictation.js @ 280:49e9e591c9bb

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Add persistent dictation, prewarmed WebRTC speech input, Copilot SDK routing, animated conversation lifecycle controls, parking, and architecture coverage.
author MrJuneJune <me@mrjunejune.com>
date Tue, 18 Aug 2026 19:14:53 -0700
parents 78699f810817
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 const startButton = document.querySelector("[data-start]");
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2 const stopButton = document.querySelector("[data-stop]");
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3 const status = document.querySelector("[data-status]");
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4 const partial = document.querySelector("[data-partial]");
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5 const finalText = document.querySelector("[data-final]");
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6
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7 let peer = null;
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8 let channel = null;
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9 let stream = null;
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10 let sessionId = null;
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11 let stopResolver = null;
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12 let captureActive = false;
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13 let connectionPromise = null;
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14 const canvasTransport =
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15 new URLSearchParams(window.location.search).get("canvas") === "1";
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16
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17 function publishDictation(kind, text) {
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18 const payload = {
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19 type: "zenbu.dictation.event",
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20 kind,
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21 text,
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22 };
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23 window.parent?.postMessage(payload, "*");
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24 document.title =
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25 `Zenbu Dictation|${Date.now()}|${kind}|${encodeURIComponent(text)}`;
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26 }
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27
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28 function setStatus(message, state = "") {
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29 status.textContent = message;
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30 status.dataset.state = state;
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31 publishDictation("status", message);
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32 }
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33
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34 function waitForIceGathering(connection) {
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35 if (connection.iceGatheringState === "complete") return Promise.resolve();
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36 return new Promise(resolve => {
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37 const listener = () => {
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38 if (connection.iceGatheringState !== "complete") return;
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39 connection.removeEventListener("icegatheringstatechange", listener);
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40 resolve();
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41 };
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42 connection.addEventListener("icegatheringstatechange", listener);
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43 });
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44 }
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45
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46 function waitForTranscriptChannel(transcriptChannel) {
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47 if (transcriptChannel.readyState === "open") return Promise.resolve();
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48 return new Promise((resolve, reject) => {
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49 const timeout = window.setTimeout(
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50 () => reject(new Error("Transcript channel readiness timed out")),
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51 10000,
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52 );
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53 transcriptChannel.addEventListener("open", () => {
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54 window.clearTimeout(timeout);
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55 resolve();
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56 }, { once: true });
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57 transcriptChannel.addEventListener("close", () => {
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58 window.clearTimeout(timeout);
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59 reject(new Error("Transcript channel closed during startup"));
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60 }, { once: true });
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61 });
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62 }
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63
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64 function handleTranscript(message) {
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65 let event;
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66 try {
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67 event = JSON.parse(message.data);
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68 } catch {
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69 setStatus("Received an invalid server event", "error");
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70 return;
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71 }
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72 switch (event.type) {
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73 case "ready":
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74 setStatus(captureActive ? "Listening" : "Idle", "ready");
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75 break;
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76 case "speech.started":
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77 setStatus("Speech detected", "working");
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78 break;
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79 case "transcript.partial":
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80 partial.textContent = event.text;
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81 publishDictation("partial", event.text);
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82 break;
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83 case "transcript.final":
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84 finalText.value += `${finalText.value ? " " : ""}${event.text}`;
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85 publishDictation("final", event.text);
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86 partial.textContent = "Waiting for speech...";
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87 break;
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88 case "speech.ended":
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89 setStatus(captureActive ? "Listening" : "Idle", "ready");
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90 stopResolver?.();
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91 stopResolver = null;
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92 break;
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93 case "error":
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94 setStatus(event.message || "Transcription failed", "error");
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95 break;
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96 }
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97 }
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98
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99 async function createConnection() {
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100 if (peer && !["closed", "failed"].includes(peer.connectionState)) return;
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101 if (!stream) {
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102 stream = await navigator.mediaDevices.getUserMedia({
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103 audio: {
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104 channelCount: 1,
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105 echoCancellation: true,
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106 noiseSuppression: true,
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107 },
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108 video: false,
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109 });
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110 }
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111 for (const track of stream.getTracks()) track.enabled = false;
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112 try {
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113 peer = new RTCPeerConnection();
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114 channel = peer.createDataChannel("transcripts", { ordered: true });
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115 channel.addEventListener("message", handleTranscript);
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116 channel.addEventListener("close", () => {
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117 if (peer) setStatus("Transcript channel closed", "error");
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118 });
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119 peer.addEventListener("connectionstatechange", () => {
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120 if (peer?.connectionState === "failed") {
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121 setStatus("WebRTC connection failed", "error");
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122 void stop(false, true);
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123 }
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124 });
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125 for (const track of stream.getTracks()) peer.addTrack(track, stream);
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126
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127 const offer = await peer.createOffer();
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128 await peer.setLocalDescription(offer);
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129 await waitForIceGathering(peer);
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130 const response = await fetch("/api/webrtc/offer", {
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131 method: "POST",
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132 headers: { "Content-Type": "application/json" },
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133 body: JSON.stringify(peer.localDescription),
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134 });
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135 if (!response.ok) {
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136 const detail = await response.text();
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137 throw new Error(`Signaling failed (${response.status}): ${detail}`);
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138 }
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139 const answer = await response.json();
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140 sessionId = answer.sessionId;
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141 await peer.setRemoteDescription({
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142 sdp: answer.sdp,
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143 type: answer.type,
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144 });
280
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145 await waitForTranscriptChannel(channel);
275
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146 stopButton.disabled = false;
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147 } catch (error) {
280
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148 await stop(false, true);
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149 throw error;
275
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150 }
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151 }
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152
280
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153 async function ensureConnection() {
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154 if (peer && ["connected", "completed"].includes(peer.connectionState)) return;
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155 if (!connectionPromise) {
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156 connectionPromise = createConnection().finally(() => {
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157 connectionPromise = null;
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158 });
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159 }
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160 await connectionPromise;
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161 }
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162
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163 async function start() {
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164 captureActive = true;
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165 startButton.disabled = true;
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166 setStatus("Starting microphone...", "working");
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167 try {
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168 await ensureConnection();
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169 for (const track of stream.getTracks()) track.enabled = true;
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170 setStatus(
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171 channel?.readyState === "open" ? "Listening" : "Connecting...",
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172 channel?.readyState === "open" ? "ready" : "working",
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173 );
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174 } catch (error) {
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175 captureActive = false;
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176 setStatus(error.message || "Unable to start dictation", "error");
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177 }
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178 }
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179
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180 async function stop(waitForFinal = true, releaseStream = !canvasTransport) {
275
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181 const closingSession = sessionId;
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182 const tracks = stream?.getTracks() || [];
280
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183 captureActive = false;
275
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184 if (channel?.readyState === "open" && waitForFinal) {
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185 const ended = new Promise(resolve => {
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186 stopResolver = resolve;
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187 });
280
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188 channel.send(releaseStream ? "stop" : "pause");
275
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189 for (const track of tracks) track.enabled = false;
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190 await Promise.race([
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191 ended,
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192 new Promise(resolve => window.setTimeout(resolve, 10000)),
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193 ]);
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194 stopResolver = null;
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195 }
280
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196 for (const track of tracks) {
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197 track.enabled = false;
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diff changeset
198 if (releaseStream) track.stop();
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199 }
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200 if (!releaseStream) {
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201 startButton.disabled = false;
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202 stopButton.disabled = true;
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203 setStatus("Idle");
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204 return;
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205 }
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diff changeset
206 sessionId = null;
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diff changeset
207 if (releaseStream) stream = null;
275
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208 channel?.close();
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209 channel = null;
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210 peer?.close();
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211 peer = null;
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212 if (closingSession) {
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213 await fetch(`/api/webrtc/session/${encodeURIComponent(closingSession)}/close`, {
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214 method: "POST",
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215 keepalive: true,
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216 }).catch(() => {});
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217 }
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218 startButton.disabled = false;
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219 stopButton.disabled = true;
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220 setStatus("Idle");
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221 }
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222
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223 startButton.addEventListener("click", () => void start());
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224 stopButton.addEventListener("click", () => void stop());
280
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225 window.ZenbuDictationStart = () => start();
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226 window.ZenbuDictationStop = () => stop();
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227 window.ZenbuDictationCommit = () => {
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228 if (channel?.readyState === "open") channel.send("commit");
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229 };
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230 window.ZenbuDictationToggle = () => captureActive ? stop() : start();
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diff changeset
231 window.addEventListener("message", event => {
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232 if (event.data?.type === "zenbu.dictation.set-active") {
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233 void (event.data.active ? start() : stop());
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234 } else if (event.data?.type === "zenbu.dictation.commit") {
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235 window.ZenbuDictationCommit();
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236 }
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237 });
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238 window.addEventListener("pagehide", () => void stop(false, true));
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diff changeset
239
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diff changeset
240 async function prepareCanvasMicrophone() {
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diff changeset
241 if (!canvasTransport || peer) return;
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diff changeset
242 try {
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diff changeset
243 await ensureConnection();
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244 for (const track of stream.getTracks()) track.enabled = false;
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diff changeset
245 setStatus("Idle");
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diff changeset
246 } catch (error) {
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247 setStatus(error.message || "Unable to prepare microphone", "error");
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parents: 275
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248 }
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parents: 275
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249 }
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parents: 275
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250
49e9e591c9bb Add persistent dictation, prewarmed WebRTC speech input, Copilot SDK routing, animated conversation lifecycle controls, parking, and architecture coverage.
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parents: 275
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251 void prepareCanvasMicrophone();