查表法aLaw編解碼算法

aLaw.h源碼文件：

//==============================================================================
//  Copyright (C) 2019 王小康. All rights reserved.
//
//  作者: 王小康
//  描述: A-LAW編解碼
//  日期: 2019-04-29
//
//==============================================================================

/*
0000000abcd-  000abcd
0000001abcd-  001abcd
000001abcd--  010abcd
00001abcd---  011abcd
0001abcd----  100abcd
001abcd-----  101abcd
01abcd------  110abcd
1abcd-------  111abcd
*/
#ifndef _A_LAW_H_
#define _A_LAW_H_

void aLaw_encode(unsigned char *output, signed short *input, int number);
void aLaw_decode(signed short *output, unsigned char *input, int number);

#endif

aLaw_encode()用于編碼扮宠，output是輸出地址滥沫，input是輸入地址懂缕，number是采樣點(diǎn)個(gè)數(shù)允跑。
aLaw_decode()用于解碼，output是輸出地址搪柑，input是輸入地址吮蛹，number是采樣點(diǎn)個(gè)數(shù)。

aLaw.c源碼文件：

//==============================================================================
//  Copyright (C) 2019 王小康. All rights reserved.
//
//  作者: 王小康
//  描述: A-LAW編解碼
//  日期: 2019-04-29
//
//==============================================================================

#include "aLaw.h"

 //PCM16 -> A-LAW 
static unsigned char table1[2048] = {
    0x55, 0x54, 0x57, 0x56, 0x51, 0x50, 0x53, 0x52,
    0x5d, 0x5c, 0x5f, 0x5e, 0x59, 0x58, 0x5b, 0x5a,
    0x45, 0x44, 0x47, 0x46, 0x41, 0x40, 0x43, 0x42,
    0x4d, 0x4c, 0x4f, 0x4e, 0x49, 0x48, 0x4b, 0x4a,
    0x75, 0x75, 0x74, 0x74, 0x77, 0x77, 0x76, 0x76,
    0x71, 0x71, 0x70, 0x70, 0x73, 0x73, 0x72, 0x72,
    0x7d, 0x7d, 0x7c, 0x7c, 0x7f, 0x7f, 0x7e, 0x7e,
    0x79, 0x79, 0x78, 0x78, 0x7b, 0x7b, 0x7a, 0x7a,
    0x65, 0x65, 0x65, 0x65, 0x64, 0x64, 0x64, 0x64,
    0x67, 0x67, 0x67, 0x67, 0x66, 0x66, 0x66, 0x66,
    0x61, 0x61, 0x61, 0x61, 0x60, 0x60, 0x60, 0x60,
    0x63, 0x63, 0x63, 0x63, 0x62, 0x62, 0x62, 0x62,
    0x6d, 0x6d, 0x6d, 0x6d, 0x6c, 0x6c, 0x6c, 0x6c,
    0x6f, 0x6f, 0x6f, 0x6f, 0x6e, 0x6e, 0x6e, 0x6e,
    0x69, 0x69, 0x69, 0x69, 0x68, 0x68, 0x68, 0x68,
    0x6b, 0x6b, 0x6b, 0x6b, 0x6a, 0x6a, 0x6a, 0x6a,
    0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15,
    0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14,
    0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17, 0x17,
    0x16, 0x16, 0x16, 0x16, 0x16, 0x16, 0x16, 0x16,
    0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
    0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
    0x13, 0x13, 0x13, 0x13, 0x13, 0x13, 0x13, 0x13,
    0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12,
    0x1d, 0x1d, 0x1d, 0x1d, 0x1d, 0x1d, 0x1d, 0x1d,
    0x1c, 0x1c, 0x1c, 0x1c, 0x1c, 0x1c, 0x1c, 0x1c,
    0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
    0x1e, 0x1e, 0x1e, 0x1e, 0x1e, 0x1e, 0x1e, 0x1e,
    0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19,
    0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
    0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b,
    0x1a, 0x1a, 0x1a, 0x1a, 0x1a, 0x1a, 0x1a, 0x1a,
    0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
    0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
    0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
    0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
    0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
    0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
    0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
    0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
    0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
    0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
    0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
    0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d,
    0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d,
    0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
    0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
    0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
    0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
    0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e,
    0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e,
    0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
    0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
    0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
    0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
    0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
    0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
    0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
    0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
    0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35,
    0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35,
    0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35,
    0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35,
    0x34, 0x34, 0x34, 0x34, 0x34, 0x34, 0x34, 0x34,
    0x34, 0x34, 0x34, 0x34, 0x34, 0x34, 0x34, 0x34,
    0x34, 0x34, 0x34, 0x34, 0x34, 0x34, 0x34, 0x34,
    0x34, 0x34, 0x34, 0x34, 0x34, 0x34, 0x34, 0x34,
    0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37,
    0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37,
    0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37,
    0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
    0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
    0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
    0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
    0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
    0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
    0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
    0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
    0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
    0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
    0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
    0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
    0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
    0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,
    0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,
    0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,
    0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,
    0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d,
    0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d,
    0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d,
    0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d, 0x3d,
    0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c,
    0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c,
    0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c,
    0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c, 0x3c,
    0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f,
    0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f,
    0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f,
    0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f,
    0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e,
    0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e,
    0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e,
    0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e,
    0x39, 0x39, 0x39, 0x39, 0x39, 0x39, 0x39, 0x39,
    0x39, 0x39, 0x39, 0x39, 0x39, 0x39, 0x39, 0x39,
    0x39, 0x39, 0x39, 0x39, 0x39, 0x39, 0x39, 0x39,
    0x39, 0x39, 0x39, 0x39, 0x39, 0x39, 0x39, 0x39,
    0x38, 0x38, 0x38, 0x38, 0x38, 0x38, 0x38, 0x38,
    0x38, 0x38, 0x38, 0x38, 0x38, 0x38, 0x38, 0x38,
    0x38, 0x38, 0x38, 0x38, 0x38, 0x38, 0x38, 0x38,
    0x38, 0x38, 0x38, 0x38, 0x38, 0x38, 0x38, 0x38,
    0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b,
    0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b,
    0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b,
    0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b, 0x3b,
    0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a,
    0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a,
    0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a,
    0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a, 0x3a,
    0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25,
    0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25,
    0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25,
    0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25,
    0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25,
    0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25,
    0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25,
    0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25, 0x25,
    0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24,
    0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24,
    0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24,
    0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24,
    0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24,
    0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24,
    0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24,
    0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24, 0x24,
    0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27,
    0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27,
    0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27,
    0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27,
    0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27,
    0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27,
    0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27,
    0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27, 0x27,
    0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26,
    0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26,
    0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26,
    0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26,
    0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26,
    0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26,
    0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26,
    0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26,
    0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,
    0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,
    0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,
    0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,
    0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,
    0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,
    0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,
    0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
    0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
    0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
    0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
    0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
    0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
    0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
    0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23, 0x23,
    0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
    0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
    0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
    0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
    0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
    0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
    0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
    0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,
    0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d,
    0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d,
    0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d,
    0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d,
    0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d,
    0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d,
    0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d,
    0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d,
    0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c,
    0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c,
    0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c,
    0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c,
    0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c,
    0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c,
    0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c,
    0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c, 0x2c,
    0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f,
    0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f,
    0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f,
    0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f,
    0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f,
    0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f,
    0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f,
    0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f,
    0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
    0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
    0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
    0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
    0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
    0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
    0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
    0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
    0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29,
    0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29,
    0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29,
    0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29,
    0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29,
    0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29,
    0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29,
    0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29, 0x29,
    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
    0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
    0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
    0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
    0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
    0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
    0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
    0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
    0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
    0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
    0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
    0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
    0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
    0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
    0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
    0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
    0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
    0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a
};

 //A-LAW -> PCM16
static signed  short table2[128] = {
    0x157f, 0x147f, 0x177f, 0x167f, 0x117f, 0x107f, 0x137f, 0x127f,
    0x1d7f, 0x1c7f, 0x1f7f, 0x1e7f, 0x197f, 0x187f, 0x1b7f, 0x1a7f,
    0x0abf, 0x0a3f, 0x0bbf, 0x0b3f, 0x08bf, 0x083f, 0x09bf, 0x093f,
    0x0ebf, 0x0e3f, 0x0fbf, 0x0f3f, 0x0cbf, 0x0c3f, 0x0dbf, 0x0d3f,
    0x55ff, 0x51ff, 0x5dff, 0x59ff, 0x45ff, 0x41ff, 0x4dff, 0x49ff,
    0x75ff, 0x71ff, 0x7dff, 0x79ff, 0x65ff, 0x61ff, 0x6dff, 0x69ff,
    0x2aff, 0x28ff, 0x2eff, 0x2cff, 0x22ff, 0x20ff, 0x26ff, 0x24ff,
    0x3aff, 0x38ff, 0x3eff, 0x3cff, 0x32ff, 0x30ff, 0x36ff, 0x34ff,
    0x0157, 0x0147, 0x0177, 0x0167, 0x0117, 0x0107, 0x0137, 0x0127,
    0x01d7, 0x01c7, 0x01f7, 0x01e7, 0x0197, 0x0187, 0x01b7, 0x01a7,
    0x0057, 0x0047, 0x0077, 0x0067, 0x0017, 0x0007, 0x0037, 0x0027,
    0x00d7, 0x00c7, 0x00f7, 0x00e7, 0x0097, 0x0087, 0x00b7, 0x00a7,
    0x055f, 0x051f, 0x05df, 0x059f, 0x045f, 0x041f, 0x04df, 0x049f,
    0x075f, 0x071f, 0x07df, 0x079f, 0x065f, 0x061f, 0x06df, 0x069f,
    0x02af, 0x028f, 0x02ef, 0x02cf, 0x022f, 0x020f, 0x026f, 0x024f,
    0x03af, 0x038f, 0x03ef, 0x03cf, 0x032f, 0x030f, 0x036f, 0x034f
};

void aLaw_encode(unsigned char *output, signed short *input, int number){
    while(number-- > 0){
        if(input[0] >= 0) output[0] = table1[input[0] >> 4] | 0x80;
        else              output[0] = table1[(-input[0]) >> 4];
        output += 1;
        input += 1;
    }
}

void aLaw_decode(signed short *output, unsigned char *input, int number){
    while(number-- > 0){
        if(input[0]&0x80) output[0] = table2[input[0]&0x7f];
        else              output[0] = -table2[input[0]];
        output += 1;
        input += 1;
    }
}

最后編輯于：2021.03.05 15:43:36

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