fix: 前端录音改用WAV格式（PCM 16kHz），兼容模型端

static/index.html

@@ -304,6 +304,9 @@
         let audioChunks = [];
         let conversationId = null;
         let audioContext = null;
+        let audioStream = null;
+        let scriptProcessor = null;
+        let recordedBuffers = [];
         
         // 元素
         const recordBtn = document.getElementById('recordBtn');
@@ -333,10 +336,58 @@
             }
         }
         
+        // 创建 WAV 文件
+        function createWavFile(audioBuffer, sampleRate = 16000) {
+            const numChannels = 1;
+            const bitsPerSample = 16;
+            const bytesPerSample = bitsPerSample / 8;
+            const blockAlign = numChannels * bytesPerSample;
+            const byteRate = sampleRate * blockAlign;
+            const dataSize = audioBuffer.length * bytesPerSample;
+            const headerSize = 44;
+            const totalSize = headerSize + dataSize;
+            
+            const buffer = new ArrayBuffer(totalSize);
+            const view = new DataView(buffer);
+            
+            // WAV header
+            writeString(view, 0, 'RIFF');
+            view.setUint32(4, totalSize - 8, true);
+            writeString(view, 8, 'WAVE');
+            writeString(view, 12, 'fmt ');
+            view.setUint32(16, 16, true); // fmt chunk size
+            view.setUint16(20, 1, true); // audio format (PCM)
+            view.setUint16(22, numChannels, true);
+            view.setUint32(24, sampleRate, true);
+            view.setUint32(28, byteRate, true);
+            view.setUint16(32, blockAlign, true);
+            view.setUint16(34, bitsPerSample, true);
+            writeString(view, 36, 'data');
+            view.setUint32(40, dataSize, true);
+            
+            // 写入音频数据
+            floatTo16BitPCM(view, 44, audioBuffer);
+            
+            return new Blob([buffer], { type: 'audio/wav' });
+        }
+        
+        function writeString(view, offset, string) {
+            for (let i = 0; i < string.length; i++) {
+                view.setUint8(offset + i, string.charCodeAt(i));
+            }
+        }
+        
+        function floatTo16BitPCM(view, offset, input) {
+            for (let i = 0; i < input.length; i++, offset += 2) {
+                const s = Math.max(-1, Math.min(1, input[i]));
+                view.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
+            }
+        }
+        
         // 初始化录音
         async function initAudio() {
             try {
-                const stream = await navigator.mediaDevices.getUserMedia({ 
+                audioStream = await navigator.mediaDevices.getUserMedia({ 
                     audio: {
                         echoCancellation: true,
                         noiseSuppression: true,
@@ -344,22 +395,21 @@
                     }
                 });
                 
-                audioContext = new (window.AudioContext || window.webkitAudioContext)();
-                
-                // 创建 MediaRecorder
-                mediaRecorder = new MediaRecorder(stream, {
-                    mimeType: 'audio/webm'
+                audioContext = new (window.AudioContext || window.webkitAudioContext)({
+                    sampleRate: 16000
                 });
                 
-                mediaRecorder.ondataavailable = (e) => {
-                    audioChunks.push(e.data);
+                const source = audioContext.createMediaStreamSource(audioStream);
+                scriptProcessor = audioContext.createScriptProcessor(4096, 1, 1);
+                
+                scriptProcessor.onaudioprocess = (e) => {
+                    if (isRecording) {
+                        recordedBuffers.push(e.inputBuffer.getChannelData(0).slice());
+                    }
                 };
                 
-                mediaRecorder.onstop = async () => {
-                    const audioBlob = new Blob(audioChunks, { type: 'audio/webm' });
-                    audioChunks = [];
-                    await sendAudio(audioBlob);
-                };
+                source.connect(scriptProcessor);
+                scriptProcessor.connect(audioContext.destination);
                 
                 return true;
             } catch (e) {
@@ -371,13 +421,12 @@
         
         // 开始录音
         async function startRecording() {
-            if (!mediaRecorder) {
+            if (!audioContext) {
                 const success = await initAudio();
                 if (!success) return;
             }
             
-            audioChunks = [];
-            mediaRecorder.start();
+            recordedBuffers = [];
             isRecording = true;
             
             recordBtn.classList.add('recording');
@@ -390,16 +439,29 @@
         
         // 停止录音
         function stopRecording() {
-            if (mediaRecorder && isRecording) {
-                mediaRecorder.stop();
+            if (isRecording) {
                 isRecording = false;
                 
+                // 合并所有缓冲区
+                const totalLength = recordedBuffers.reduce((acc, buf) => acc + buf.length, 0);
+                const mergedBuffer = new Float32Array(totalLength);
+                let offset = 0;
+                for (const buf of recordedBuffers) {
+                    mergedBuffer.set(buf, offset);
+                    offset += buf.length;
+                }
+                
+                // 创建 WAV 文件
+                const wavBlob = createWavFile(mergedBuffer, 16000);
+                
                 recordBtn.classList.remove('recording');
                 recordBtn.querySelector('.icon').textContent = '🎤';
                 recordBtn.querySelector('.text').textContent = '点击录音';
                 recordStatus.textContent = '处理中...';
                 recordStatus.classList.remove('recording');
                 waveform.style.display = 'none';
+                
+                sendAudio(wavBlob);
             }
         }
         
@@ -409,7 +471,7 @@
                 showLoading();
                 
                 const formData = new FormData();
-                formData.append('audio', audioBlob, 'recording.webm');
+                formData.append('audio', audioBlob, 'recording.wav');
                 if (conversationId) {
                     formData.append('conversation_id', conversationId);
                 }