fix: 适配16k采样率的实时音频流

src/index.tsx

@@ -491,13 +491,14 @@ export function Home() {
     const totalFrames = Math.floor((u8.length - 8) / 4);
     if (totalFrames <= 0) return [0, 0, new Uint8Array(0)];
     // 48k -> 16k，降采样因子为3
-    const downFactor = 3;
-    const outFrames = Math.floor((totalFrames + downFactor - 1) / downFactor) * 2; // 向上取整
+    const downFactor = 1;
+    const outFrames = totalFrames;
     let sumL = 0;
     let sumR = 0;
-    const mono8 = new Uint8Array(outFrames + 8);
-    let j = 0, k = 0;
-    for (let i = 8; i + 3 < u8.length; i += 4, j++)
+    const mono8 = new Uint8Array(outFrames * 2 + 8);
+    console.log('sampling', outFrames, u8.byteLength);
+    let k = 0;
+    for (let i = 8; i + 3 < u8.length; i += 4)
     {
       const a = u8[i + 0] & 0xff;
       const b = u8[i + 1] & 0xff;
@@ -513,18 +514,15 @@ export function Home() {
       const nr = r / 32768;
       sumL += nl * nl;
       sumR += nr * nr;
-      // 双声道合成为单声道（16-bit），再压缩为 Int8
-      // C = A + B - (A * B / 32767)
-      if (j % downFactor == 0)
-      {
-        let m = l + r - Math.floor((l * r) / 32767);
-        if (m > 32767) m = 32767;
-        else if (m < -32768) m = -32768;
-        let H = (m >> 8) & 0xff;
-        let L = m & 0xff;
-        mono8[8 + k++] = (L << 8);
-        mono8[8 + k++] = H;
-      }
+      // 双声道合成为单声道；双静音直接归零避免底噪，其他情况用平均叠加
+      const nearSilent = Math.abs(l) < 4 && Math.abs(r) < 4;
+      let m = nearSilent ? 0 : (l + r) / 2;
+      if (m > 32767) m = 32767;
+      else if (m < -32768) m = -32768;
+      const H = (m >> 8) & 0xff;
+      const L = m & 0xff;
+      mono8[8 + k++] = L;
+      mono8[8 + k++] = H;
     }
     const leftRms = Math.sqrt(sumL / totalFrames);
     const rightRms = Math.sqrt(sumR / totalFrames);
@@ -533,6 +531,7 @@ export function Home() {
   }
 
   const blocksRef = useRef<Uint8Array[]>([]);
+
   const scheduleLiveTick = async () => {
     let jensen = getJensen();
     if (jensen == null) return;
@@ -569,10 +568,12 @@ export function Home() {
     liveTimeoutRef.current = window.setTimeout(scheduleLiveTick, 100);
 
     // 开启发送音频定时器
+    /*
     if (sendTimeoutRef.current !== null) {  
       window.clearTimeout(sendTimeoutRef.current);
     }
     sendTimeoutRef.current = window.setTimeout(sendLiveAudio, 100);
+    */
   }
 
   function stringToUuidBytes(str: string): Uint8Array {
@@ -620,8 +621,8 @@ export function Home() {
   // 创建一个websocket实例
   const wsRef = useRef<WebSocket | null>(null);
   const startLiveSession = async () => {
-    
-    const token = 'kL5NmbPEGOptIGbt8jtR3pjXVHT9p774n7N4oQAARb0ctUMnq4bABgBPZ7QjYSUi';
+    if (new Date().getTime() > 0) return startSession();
+    const token = 'O9UkcTQg1l9HbKocNuNVplRhI3q7JdTRiQAP5j3zjSFNQ2yRd3crH0HrDfRDP7TH';
     let url = 'wss://live.test.hidock.com/ws/realtime?accesstoken=' + token + '&mode=room&language=cmn&';
     //         wss://live.test.hidock.com/ws/realtime?accesstoken=&mode=room&language=cmn
     wsRef.current = new WebSocket(url);
@@ -657,11 +658,11 @@ export function Home() {
       }
       if (data.type == 'partial')
       {
-        console.log('live', data.text);
+        console.log('live-text', data.text);
       }
       if (data.type == 'final')
       {
-        console.log('live', data.text);
+        console.log('live-text', data.text);
       }
     }
     wsRef.current.onerror = (event) => {
@@ -688,14 +689,13 @@ export function Home() {
       window.clearTimeout(liveTimeoutRef.current);
       liveTimeoutRef.current = null;
     }
-    console.log('live stopped');
-    /*
-    const totalSamples = blocksRef.current.reduce((sum, arr) => sum + arr.length, 0);
+    Logger.info('jensen', 'live', 'live stopped');
+    const totalSamples = blocksRef.current.reduce((sum, arr) => sum + arr.length - 8, 0);
     const monoAll = new Uint8Array(totalSamples);
     let offsetMono = 0;
     for (const arr of blocksRef.current) {
-      monoAll.set(arr, offsetMono);
-      offsetMono += arr.length;
+      monoAll.set(arr.slice(8), offsetMono);
+      offsetMono += arr.length - 8;
     }
     let blob = new Blob([monoAll.buffer], { type: 'audio/pcm' });
     let url = URL.createObjectURL(blob);
@@ -704,7 +704,6 @@ export function Home() {
     a.download = 'live.pcm';
     a.click();
     URL.revokeObjectURL(url);
-    */
   }
 
   return (