ALG_ulawDecode音频解码函数

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本文介绍了一段用于将uLaw格式音乐转换为PCM格式的C语言代码，并提出了将其移植到Java环境中遇到的问题。主要难点在于Java不支持无符号短整型变量，寻求解决方案。

i Have a code which convert ulaw music to pcm format

The Code is programed by C , but now, i need it run in java

the Code is like this

short ALG_ulawDecode(unsigned short input)
{
unsigned short isNegative;

short nOut;

isNegative = ((input & 0x80) == 0);
if (isNegative)
    nOut = 127 - input;
else
    nOut = 255 - input;
if (nOut < 2)
    nOut *= 2;
else if (nOut < 16)
    nOut = ((nOut - 1) << 1) + 1 + 1;
else if (nOut < 32)
    nOut = ((nOut - 16) << 2) + 2 + 31;
else if (nOut < 48)
    nOut = ((nOut - 32) << 3) + 4 + 95;
else if (nOut < 64)
    nOut = ((nOut - 48) << 4) + 8 + 223;
else if (nOut < 80)
    nOut = ((nOut - 64) << 5) + 16 + 479;
else if (nOut < 96)
    nOut = ((nOut - 80) << 6) + 32 + 991;
else if (nOut < 112)
    nOut = ((nOut - 96) << 7) + 64 + 2015;
else
    nOut = ((nOut - 112) << 8) + 128 + 4063;
if (isNegative)
    nOut = -nOut;
nOut <<= 2;
return nOut;
}