feat: add silent check

package.json

@@ -1,14 +1,17 @@
 {
   "name": "@kevisual/video",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "description": "",
   "scripts": {
     "build": "tsup"
   },
+  "files": [
+    "dist"
+  ],
   "keywords": [],
   "author": "abearxiong <xiongxiao@xiongxiao.me> (https://www.xiongxiao.me)",
   "license": "MIT",
-  "packageManager": "pnpm@10.6.2",
+  "packageManager": "pnpm@10.8.1",
   "type": "module",
   "devDependencies": {
     "@types/node": "^22.14.1",
@@ -16,7 +19,10 @@
     "typescript": "^5.8.3"
   },
   "exports": {
-    ".": "./dist/index.mjs"
+    ".": {
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.js"
+    }
   },
   "publishConfig": {
     "access": "public"

src/index.ts

@@ -1,3 +1,4 @@
 import { encodeWav, decodeWav } from './wav-converter/index.ts';
+import { isSilentNoLength, isChunkSilent } from './silent/index.ts';
 
-export { encodeWav, decodeWav };
+export { encodeWav, decodeWav, isSilentNoLength, isChunkSilent };

src/silent/index.ts

@@ -0,0 +1,27 @@
+/**
+ * 判断是否为无声,
+ * 方法 1：检查 Buffer 是否全 0（适用于原始 PCM 数据）
+ * @param chunk
+ * @returns
+ */
+export const isSilentNoLength = (chunk: Buffer) => {
+  const isSilent = Buffer.compare(chunk, Buffer.alloc(chunk.length)) === 0;
+  return isSilent;
+};
+
+/**
+ * 判断是否为无声, 统计振幅（更通用）
+ * 方法 2：检查每个样本是否低于阈值
+ * @param chunk
+ * @param threshold
+ * @returns
+ */
+export function isChunkSilent(chunk: Buffer, threshold = 0.01) {
+  const floats = new Float32Array(chunk.buffer);
+  for (let i = 0; i < floats.length; i++) {
+    if (Math.abs(floats[i]) > threshold) {
+      return false; // 发现非静音样本
+    }
+  }
+  return true; // 所有样本均低于阈值
+}