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/*****************************************************************************/
/* adpcm.cpp Copyright (c) Ladislav Zezula 2003 */
/*---------------------------------------------------------------------------*/
/* This module contains implementation of adpcm decompression method used by */
/* Storm.dll to decompress WAVE files. Thanks to Tom Amigo for releasing */
/* his sources. */
/*---------------------------------------------------------------------------*/
/* Date Ver Who Comment */
/* -------- ---- --- ------- */
/* 11.03.03 1.00 Lad Splitted from Pkware.cpp */
/* 20.05.03 2.00 Lad Added compression */
/* 19.11.03 2.01 Dan Big endian handling */
/*****************************************************************************/
#include "adpcm.h"
//------------------------------------------------------------------------------
// Structures
typedef union _BYTE_AND_WORD_PTR
{
short * pw;
unsigned char * pb;
} BYTE_AND_WORD_PTR;
typedef union _WORD_AND_BYTE_ARRAY
{
short w;
unsigned char b[2];
} WORD_AND_BYTE_ARRAY;
//-----------------------------------------------------------------------------
// Tables necessary dor decompression
static long Table1503F120[] =
{
0xFFFFFFFF, 0x00000000, 0xFFFFFFFF, 0x00000004, 0xFFFFFFFF, 0x00000002, 0xFFFFFFFF, 0x00000006,
0xFFFFFFFF, 0x00000001, 0xFFFFFFFF, 0x00000005, 0xFFFFFFFF, 0x00000003, 0xFFFFFFFF, 0x00000007,
0xFFFFFFFF, 0x00000001, 0xFFFFFFFF, 0x00000005, 0xFFFFFFFF, 0x00000003, 0xFFFFFFFF, 0x00000007,
0xFFFFFFFF, 0x00000002, 0xFFFFFFFF, 0x00000004, 0xFFFFFFFF, 0x00000006, 0xFFFFFFFF, 0x00000008
};
static long step_table[] =
{
0x00000007, 0x00000008, 0x00000009, 0x0000000A, 0x0000000B, 0x0000000C, 0x0000000D, 0x0000000E,
0x00000010, 0x00000011, 0x00000013, 0x00000015, 0x00000017, 0x00000019, 0x0000001C, 0x0000001F,
0x00000022, 0x00000025, 0x00000029, 0x0000002D, 0x00000032, 0x00000037, 0x0000003C, 0x00000042,
0x00000049, 0x00000050, 0x00000058, 0x00000061, 0x0000006B, 0x00000076, 0x00000082, 0x0000008F,
0x0000009D, 0x000000AD, 0x000000BE, 0x000000D1, 0x000000E6, 0x000000FD, 0x00000117, 0x00000133,
0x00000151, 0x00000173, 0x00000198, 0x000001C1, 0x000001EE, 0x00000220, 0x00000256, 0x00000292,
0x000002D4, 0x0000031C, 0x0000036C, 0x000003C3, 0x00000424, 0x0000048E, 0x00000502, 0x00000583,
0x00000610, 0x000006AB, 0x00000756, 0x00000812, 0x000008E0, 0x000009C3, 0x00000ABD, 0x00000BD0,
0x00000CFF, 0x00000E4C, 0x00000FBA, 0x0000114C, 0x00001307, 0x000014EE, 0x00001706, 0x00001954,
0x00001BDC, 0x00001EA5, 0x000021B6, 0x00002515, 0x000028CA, 0x00002CDF, 0x0000315B, 0x0000364B,
0x00003BB9, 0x000041B2, 0x00004844, 0x00004F7E, 0x00005771, 0x0000602F, 0x000069CE, 0x00007462,
0x00007FFF
};
//----------------------------------------------------------------------------
// CompressWave
// 1500EF70
int CompressADPCM(unsigned char * pbOutBuffer, int dwOutLength, short * pwInBuffer, int dwInLength, int nChannels, int nCmpLevel)
// ECX EDX
{
WORD_AND_BYTE_ARRAY Wcmp;
BYTE_AND_WORD_PTR out; // Pointer to the output buffer
long SInt32Array1[2];
long SInt32Array2[2];
long SInt32Array3[2];
long nBytesRemains = dwOutLength; // Number of bytes remaining
long nWordsRemains; // Number of words remaining
// unsigned char * pbSaveOutBuffer; // Copy of output buffer (actually not used)
unsigned long dwBitBuff;
unsigned long dwStopBit;
unsigned long dwBit;
unsigned long ebx;
unsigned long esi;
long nTableValue;
long nOneWord;
long var_1C;
long var_2C;
int nLength;
int nIndex;
int nValue;
int i, chnl;
// If less than 2 bytes remain, don't decompress anything
// pbSaveOutBuffer = pbOutBuffer;
out.pb = pbOutBuffer;
if(nBytesRemains < 2)
return 2;
Wcmp.b[1] = (unsigned char)(nCmpLevel - 1);
Wcmp.b[0] = (unsigned char)0;
*out.pw++ = BSWAP_INT16_SIGNED(Wcmp.w);
if((out.pb - pbOutBuffer + (nChannels * 2)) > nBytesRemains)
return (int)(out.pb - pbOutBuffer + (nChannels * 2));
SInt32Array1[0] = SInt32Array1[1] = 0x2C;
for(i = 0; i < nChannels; i++)
{
nOneWord = BSWAP_INT16_SIGNED(*pwInBuffer++);
*out.pw++ = BSWAP_INT16_SIGNED((short)nOneWord);
SInt32Array2[i] = nOneWord;
}
// Weird. But it's there
nLength = dwInLength;
if(nLength < 0) // mov eax, dwInLength; cdq; sub eax, edx;
nLength++;
nLength = (nLength / 2) - (int)(out.pb - pbOutBuffer);
nLength = (nLength < 0) ? 0 : nLength;
nIndex = nChannels - 1; // edi
nWordsRemains = dwInLength / 2; // eax
// ebx - nChannels
// ecx - pwOutPos
for(chnl = nChannels; chnl < nWordsRemains; chnl++)
{
// 1500F030
if((out.pb - pbOutBuffer + 2) > nBytesRemains)
return (int)(out.pb - pbOutBuffer + 2);
// Switch index
if(nChannels == 2)
nIndex = (nIndex == 0) ? 1 : 0;
// Load one word from the input stream
nOneWord = BSWAP_INT16_SIGNED(*pwInBuffer++); // ecx - nOneWord
SInt32Array3[nIndex] = nOneWord;
// esi - SInt32Array2[nIndex]
// eax - nValue
nValue = nOneWord - SInt32Array2[nIndex];
nValue = (nValue < 0) ? ((nValue ^ 0xFFFFFFFF) + 1) : nValue;
ebx = (nOneWord >= SInt32Array2[nIndex]) ? 0 : 0x40;
// esi - SInt32Array2[nIndex]
// edx - step_table[SInt32Array2[nIndex]]
// edi - (step_table[SInt32Array1[nIndex]] >> nCmpLevel)
nTableValue = step_table[SInt32Array1[nIndex]];
dwStopBit = (unsigned long)nCmpLevel;
// edi - nIndex;
if(nValue < (nTableValue >> nCmpLevel))
{
if(SInt32Array1[nIndex] != 0)
SInt32Array1[nIndex]--;
*out.pb++ = 0x80;
}
else
{
while(nValue > nTableValue * 2)
{
if(SInt32Array1[nIndex] >= 0x58 || nLength == 0)
break;
SInt32Array1[nIndex] += 8;
if(SInt32Array1[nIndex] > 0x58)
SInt32Array1[nIndex] = 0x58;
nTableValue = step_table[SInt32Array1[nIndex]];
*out.pb++ = 0x81;
nLength--;
}
var_2C = nTableValue >> Wcmp.b[1];
dwBitBuff = 0;
esi = (1 << (dwStopBit - 2));
dwStopBit = (esi <= 0x20) ? esi : 0x20;
for(var_1C = 0, dwBit = 1; ; dwBit <<= 1)
{
// esi = var_1C + nTableValue;
if((var_1C + nTableValue) <= nValue)
{
var_1C += nTableValue;
dwBitBuff |= dwBit;
}
if(dwBit == dwStopBit)
break;
nTableValue >>= 1;
}
nValue = SInt32Array2[nIndex];
if(ebx != 0)
{
nValue -= (var_1C + var_2C);
if(nValue < -32768)
nValue = -32768;
}
else
{
nValue += (var_1C + var_2C);
if(nValue > 32767)
nValue = 32767;
}
SInt32Array2[nIndex] = nValue;
*out.pb++ = (unsigned char)(dwBitBuff | ebx);
nTableValue = Table1503F120[dwBitBuff & 0x1F];
SInt32Array1[nIndex] = SInt32Array1[nIndex] + nTableValue;
if(SInt32Array1[nIndex] < 0)
SInt32Array1[nIndex] = 0;
else if(SInt32Array1[nIndex] > 0x58)
SInt32Array1[nIndex] = 0x58;
}
}
return (int)(out.pb - pbOutBuffer);
}
//----------------------------------------------------------------------------
// DecompressADPCM
// 1500F230
int DecompressADPCM(unsigned char * pbOutBuffer, int dwOutLength, unsigned char * pbInBuffer, int dwInLength, int nChannels)
{
BYTE_AND_WORD_PTR out; // Output buffer
BYTE_AND_WORD_PTR in;
unsigned char * pbInBufferEnd = (pbInBuffer + dwInLength);
long SInt32Array1[2];
long SInt32Array2[2];
long nOneWord;
int nIndex;
int i;
SInt32Array1[0] = SInt32Array1[1] = 0x2C;
out.pb = pbOutBuffer;
in.pb = pbInBuffer;
in.pw++;
// Fill the Uint32Array2 array by channel values.
for(i = 0; i < nChannels; i++)
{
nOneWord = BSWAP_INT16_SIGNED(*in.pw++);
SInt32Array2[i] = nOneWord;
if(dwOutLength < 2)
return (int)(out.pb - pbOutBuffer);
*out.pw++ = BSWAP_INT16_SIGNED((short)nOneWord);
dwOutLength -= sizeof(short);
}
// Get the initial index
nIndex = nChannels - 1;
// Perform the decompression
while(in.pb < pbInBufferEnd)
{
unsigned char nOneByte = *in.pb++;
// Switch index
if(nChannels == 2)
nIndex = (nIndex == 0) ? 1 : 0;
// 1500F2A2: Get one byte from input buffer
if(nOneByte & 0x80)
{
switch(nOneByte & 0x7F)
{
case 0: // 1500F315
if(SInt32Array1[nIndex] != 0)
SInt32Array1[nIndex]--;
if(dwOutLength < 2)
return (int)(out.pb - pbOutBuffer);
*out.pw++ = BSWAP_INT16_SIGNED((unsigned short)SInt32Array2[nIndex]);
dwOutLength -= sizeof(unsigned short);
break;
case 1: // 1500F2E8
SInt32Array1[nIndex] += 8;
if(SInt32Array1[nIndex] > 0x58)
SInt32Array1[nIndex] = 0x58;
if(nChannels == 2)
nIndex = (nIndex == 0) ? 1 : 0;
break;
case 2: // 1500F41E
break;
default: // 1500F2C4
SInt32Array1[nIndex] -= 8;
if(SInt32Array1[nIndex] < 0)
SInt32Array1[nIndex] = 0;
if(nChannels == 2)
nIndex = (nIndex == 0) ? 1 : 0;
break;
}
}
else
{
// 1500F349
long temp1 = step_table[SInt32Array1[nIndex]]; // EDI
long temp2 = temp1 >> pbInBuffer[1]; // ESI
long temp3 = SInt32Array2[nIndex]; // ECX
if(nOneByte & 0x01) // EBX = nOneByte
temp2 += (temp1 >> 0);
if(nOneByte & 0x02)
temp2 += (temp1 >> 1);
if(nOneByte & 0x04)
temp2 += (temp1 >> 2);
if(nOneByte & 0x08)
temp2 += (temp1 >> 3);
if(nOneByte & 0x10)
temp2 += (temp1 >> 4);
if(nOneByte & 0x20)
temp2 += (temp1 >> 5);
if(nOneByte & 0x40)
{
temp3 = temp3 - temp2;
if(temp3 <= -32768)
temp3 = -32768;
}
else
{
temp3 = temp3 + temp2;
if(temp3 >= 32767)
temp3 = 32767;
}
SInt32Array2[nIndex] = temp3;
if(dwOutLength < 2)
break;
// Store the output 16-bit value
*out.pw++ = BSWAP_INT16_SIGNED((short)SInt32Array2[nIndex]);
dwOutLength -= 2;
SInt32Array1[nIndex] += Table1503F120[nOneByte & 0x1F];
if(SInt32Array1[nIndex] < 0)
SInt32Array1[nIndex] = 0;
else if(SInt32Array1[nIndex] > 0x58)
SInt32Array1[nIndex] = 0x58;
}
}
return (int)(out.pb - pbOutBuffer);
}
|
