app-starlock/lib/talk/call/g711.dart

import 'dart:async';
import 'package:flutter/services.dart';

class G711 {
  Future<List<int>> readAssetFile(String assetPath) async {
    final ByteData data = await rootBundle.load(assetPath);
    final List<int> bytes = data.buffer.asUint8List();
    return bytes;
  }

  int ALawToLinear(int aVal) {
    // 取反
    aVal = ~aVal;

    // 计算偏移
    int t = ((aVal & 0x0F) << 3) + 0x84;
    t <<= (aVal & 0x70) >> 4;

    // 根据符号位决定返回值的正负
    return (aVal & 0x80) != 0 ? 0x84 - t : t - 0x84;
  }

//711解码为pcm数据
  List<int> convertList(List<int> aLawList) {
    // 将 ALawToLinear 函数应用于 List<int>
    final List<int> linearList = aLawList.map(ALawToLinear).toList();
    return linearList;
  }

//List<int>转为Uint8List
  Uint8List convertToInt8ListLittleEndian(List<int> intList) {
    final List<int> int8List = [];

    for (int intValue in intList) {
      intValue = intValue * 2;
      // 将 int 拆分为两个字节，采用小端序
      int8List.add(intValue & 0xFF); // 低 8 位
      int8List.add((intValue & 0xFF00) >> 8); // 高 8 位
    }

    return Uint8List.fromList(int8List);
  }
}