import 'dart:typed_data';

class G711Decoder {
  // G.711 µ-law解码
  Uint8List decodeG711uLaw(Uint8List data) {
    List<int> decodedData = [];

    for (int i = 0; i < data.length; i++) {
      int sample = _decodeG711uLawSample(data[i]);
      decodedData.add(sample);
    }

    return Uint8List.fromList(decodedData);
  }

  // G.711 µ-law样本解码
  int _decodeG711uLawSample(int uLawByte) {
    const int bias = 0x84;
    const int mask = 0x7F;

    uLawByte = ~uLawByte;
    int sign = uLawByte & 0x80;
    int exponent = (uLawByte & 0x70) >> 4;
    int mantissa = uLawByte & 0x0F;

    int sample = ((bias << exponent) + mantissa) * (sign == 0 ? 1 : -1);

    return sample & mask; // 防止溢出
  }
}

void main() {
  G711Decoder g711Decoder = G711Decoder();

  // 假设 g711Data 是G.711 µ-law编码的数据
  Uint8List g711Data =
      Uint8List.fromList([/* your G.711 µ-law encoded data */]);

  // 解码
  List<int> decodedData = g711Decoder.decodeG711uLaw(g711Data);

  // 处理解码后的数据，例如播放音频
  print(decodedData);
}