音声の周波数データを取得する不要なコードを削除

frontend/src/app/voice-chat/_components/VoiceChatForm.tsx

@@ -226,23 +226,6 @@
     }
   };
 
-  const setupAudioVisualization = (stream: MediaStream) => {
-    const audioContext = new AudioContext();
-    const source = audioContext.createMediaStreamSource(stream);
-    const analyser = audioContext.createAnalyser();
-    analyser.fftSize = 256;
-    source.connect(analyser);
-
-    const bufferLength = analyser.frequencyBinCount;
-    const dataArray = new Uint8Array(bufferLength);
-
-    const updateIndicator = () => {
-      analyser.getByteFrequencyData(dataArray);
-      requestAnimationFrame(updateIndicator);
-    };
-    updateIndicator();
-  };
-
   let newResponseMessage = '';
 
   // Handle incoming messages from the data channel
@@ -324,12 +307,19 @@
 
   const startSession = async () => {
     try {
-      const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
-      setupAudioVisualization(stream);
+      const stream = await navigator.mediaDevices.getUserMedia(
+        {
+          audio: {
+            channelCount: 1,
+            sampleRate: 16000,
+          },
+        },
+      );
 
       // 音声トラックの参照を保持し、初期状態を設定
       audioTrackRef.current = stream.getTracks()[0];
-      audioTrackRef.current.enabled = !isMicMuted; // 初期状態をisMicMutedの逆に設定
+      // 初期状態をisMicMutedの逆に設定
+      audioTrackRef.current.enabled = !isMicMuted;
 
       const ephemeralToken = await createEphemeralToken();
 
@@ -348,6 +338,27 @@
 
       dataChannel.onopen = () => {
         setIsDataChannelReady(true);
+        // 自動的に「こんにちは」メッセージを送信
+        const message = {
+          type: 'conversation.item.create',
+          item: {
+            type: 'message',
+            role: 'user',
+            content: [
+              {
+                type: 'input_text',
+                text: 'こんにちは',
+              },
+            ],
+          },
+        };
+
+        const response = {
+          type: 'response.create',
+        };
+
+        dataChannel.send(JSON.stringify(message));
+        dataChannel.send(JSON.stringify(response));
       };
 
       dataChannel.onclose = () => {
@@ -523,7 +534,7 @@
           if (conversation.role === 'user') {
             return (
               <MessageCard
                 key={index}
                 message={conversation.message}
                 showFeedback={false}
               />
@@ -532,7 +543,7 @@
 
           return (
             <MessageCard
               key={index}
               avatar="/omochi.png"
               message={conversation.message}
             />