mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-30 12:10:37 +00:00
606 lines
16 KiB
C++
606 lines
16 KiB
C++
/*
|
|
* This source code is public domain.
|
|
*
|
|
* Authors: Olivier Lapicque <olivierl@jps.net>
|
|
*/
|
|
|
|
///////////////////////////////////////////////////////
|
|
// DMF DELUSION DIGITAL MUSIC FILEFORMAT (X-Tracker) //
|
|
///////////////////////////////////////////////////////
|
|
#include "stdafx.h"
|
|
#include "sndfile.h"
|
|
|
|
//#define DMFLOG
|
|
|
|
//#pragma warning(disable:4244)
|
|
|
|
#pragma pack(1)
|
|
|
|
typedef struct DMFHEADER
|
|
{
|
|
DWORD id; // "DDMF" = 0x464d4444
|
|
BYTE version; // 4
|
|
CHAR trackername[8]; // "XTRACKER"
|
|
CHAR songname[30];
|
|
CHAR composer[20];
|
|
BYTE date[3];
|
|
} DMFHEADER;
|
|
|
|
typedef struct DMFINFO
|
|
{
|
|
DWORD id; // "INFO"
|
|
DWORD infosize;
|
|
} DMFINFO;
|
|
|
|
typedef struct DMFSEQU
|
|
{
|
|
DWORD id; // "SEQU"
|
|
DWORD seqsize;
|
|
WORD loopstart;
|
|
WORD loopend;
|
|
WORD sequ[2];
|
|
} DMFSEQU;
|
|
|
|
typedef struct DMFPATT
|
|
{
|
|
DWORD id; // "PATT"
|
|
DWORD patsize;
|
|
WORD numpat; // 1-1024
|
|
BYTE tracks;
|
|
BYTE firstpatinfo;
|
|
} DMFPATT;
|
|
|
|
typedef struct DMFTRACK
|
|
{
|
|
BYTE tracks;
|
|
BYTE beat; // [hi|lo] -> hi=ticks per beat, lo=beats per measure
|
|
WORD ticks; // max 512
|
|
DWORD jmpsize;
|
|
} DMFTRACK;
|
|
|
|
typedef struct DMFSMPI
|
|
{
|
|
DWORD id;
|
|
DWORD size;
|
|
BYTE samples;
|
|
} DMFSMPI;
|
|
|
|
typedef struct DMFSAMPLE
|
|
{
|
|
DWORD len;
|
|
DWORD loopstart;
|
|
DWORD loopend;
|
|
WORD c3speed;
|
|
BYTE volume;
|
|
BYTE flags;
|
|
} DMFSAMPLE;
|
|
|
|
#pragma pack()
|
|
|
|
|
|
#ifdef DMFLOG
|
|
extern void Log(LPCSTR s, ...);
|
|
#endif
|
|
|
|
|
|
BOOL CSoundFile::ReadDMF(const BYTE *lpStream, DWORD dwMemLength)
|
|
//---------------------------------------------------------------
|
|
{
|
|
DMFHEADER *pfh = (DMFHEADER *)lpStream;
|
|
DMFINFO *psi;
|
|
DMFSEQU *sequ;
|
|
DWORD dwMemPos;
|
|
BYTE infobyte[32];
|
|
BYTE smplflags[MAX_SAMPLES];
|
|
|
|
if ((!lpStream) || (dwMemLength < 1024)) return FALSE;
|
|
if ((pfh->id != 0x464d4444) || (!pfh->version) || (pfh->version & 0xF0)) return FALSE;
|
|
dwMemPos = 66;
|
|
memcpy(m_szNames[0], pfh->songname, 30);
|
|
m_szNames[0][30] = 0;
|
|
m_nType = MOD_TYPE_DMF;
|
|
m_nChannels = 0;
|
|
#ifdef DMFLOG
|
|
Log("DMF version %d: \"%s\": %d bytes (0x%04X)\n", pfh->version, m_szNames[0], dwMemLength, dwMemLength);
|
|
#endif
|
|
while (dwMemPos + 7 < dwMemLength)
|
|
{
|
|
DWORD id = *((LPDWORD)(lpStream+dwMemPos));
|
|
|
|
switch(id)
|
|
{
|
|
// "INFO"
|
|
case 0x4f464e49:
|
|
// "CMSG"
|
|
case 0x47534d43:
|
|
psi = (DMFINFO *)(lpStream+dwMemPos);
|
|
if (id == 0x47534d43) dwMemPos++;
|
|
if ((psi->infosize > dwMemLength) || (psi->infosize + dwMemPos + 8 > dwMemLength)) goto dmfexit;
|
|
if ((psi->infosize >= 8) && (!m_lpszSongComments))
|
|
{
|
|
m_lpszSongComments = new char[psi->infosize]; // changed from CHAR
|
|
if (m_lpszSongComments)
|
|
{
|
|
for (UINT i=0; i<psi->infosize-1; i++)
|
|
{
|
|
CHAR c = lpStream[dwMemPos+8+i];
|
|
if ((i % 40) == 39)
|
|
m_lpszSongComments[i] = 0x0d;
|
|
else
|
|
m_lpszSongComments[i] = (c < ' ') ? ' ' : c;
|
|
}
|
|
m_lpszSongComments[psi->infosize-1] = 0;
|
|
}
|
|
}
|
|
dwMemPos += psi->infosize + 8 - 1;
|
|
break;
|
|
|
|
// "SEQU"
|
|
case 0x55514553:
|
|
sequ = (DMFSEQU *)(lpStream+dwMemPos);
|
|
if ((sequ->seqsize >= dwMemLength) || (dwMemPos + sequ->seqsize + 12 > dwMemLength)) goto dmfexit;
|
|
{
|
|
UINT nseq = sequ->seqsize >> 1;
|
|
if (nseq >= MAX_ORDERS-1) nseq = MAX_ORDERS-1;
|
|
if (sequ->loopstart < nseq) m_nRestartPos = sequ->loopstart;
|
|
for (UINT i=0; i<nseq; i++) Order[i] = (BYTE)sequ->sequ[i];
|
|
}
|
|
dwMemPos += sequ->seqsize + 8;
|
|
break;
|
|
|
|
// "PATT"
|
|
case 0x54544150:
|
|
if (!m_nChannels)
|
|
{
|
|
DMFPATT *patt = (DMFPATT *)(lpStream+dwMemPos);
|
|
UINT numpat;
|
|
DWORD dwPos = dwMemPos + 11;
|
|
if ((patt->patsize >= dwMemLength) || (dwMemPos + patt->patsize + 8 > dwMemLength)) goto dmfexit;
|
|
numpat = patt->numpat;
|
|
if (numpat > MAX_PATTERNS) numpat = MAX_PATTERNS;
|
|
m_nChannels = patt->tracks;
|
|
if (m_nChannels < patt->firstpatinfo) m_nChannels = patt->firstpatinfo;
|
|
if (m_nChannels > 32) m_nChannels = 32;
|
|
if (m_nChannels < 4) m_nChannels = 4;
|
|
for (UINT npat=0; npat<numpat; npat++)
|
|
{
|
|
DMFTRACK *pt = (DMFTRACK *)(lpStream+dwPos);
|
|
#ifdef DMFLOG
|
|
Log("Pattern #%d: %d tracks, %d rows\n", npat, pt->tracks, pt->ticks);
|
|
#endif
|
|
UINT tracks = pt->tracks;
|
|
if (tracks > 32) tracks = 32;
|
|
UINT ticks = pt->ticks;
|
|
if (ticks > 256) ticks = 256;
|
|
if (ticks < 16) ticks = 16;
|
|
dwPos += 8;
|
|
if ((pt->jmpsize >= dwMemLength) || (dwPos + pt->jmpsize + 4 >= dwMemLength)) break;
|
|
PatternSize[npat] = (WORD)ticks;
|
|
MODCOMMAND *m = AllocatePattern(PatternSize[npat], m_nChannels);
|
|
if (!m) goto dmfexit;
|
|
Patterns[npat] = m;
|
|
DWORD d = dwPos;
|
|
dwPos += pt->jmpsize;
|
|
UINT ttype = 1;
|
|
UINT tempo = 125;
|
|
UINT glbinfobyte = 0;
|
|
UINT pbeat = (pt->beat & 0xf0) ? pt->beat>>4 : 8;
|
|
BOOL tempochange = (pt->beat & 0xf0) ? TRUE : FALSE;
|
|
memset(infobyte, 0, sizeof(infobyte));
|
|
for (UINT row=0; row<ticks; row++)
|
|
{
|
|
MODCOMMAND *p = &m[row*m_nChannels];
|
|
// Parse track global effects
|
|
if (!glbinfobyte)
|
|
{
|
|
BYTE info = lpStream[d++];
|
|
BYTE infoval = 0;
|
|
if ((info & 0x80) && (d < dwPos)) glbinfobyte = lpStream[d++];
|
|
info &= 0x7f;
|
|
if ((info) && (d < dwPos)) infoval = lpStream[d++];
|
|
switch(info)
|
|
{
|
|
case 1: ttype = 0; tempo = infoval; tempochange = TRUE; break;
|
|
case 2: ttype = 1; tempo = infoval; tempochange = TRUE; break;
|
|
case 3: pbeat = infoval>>4; tempochange = ttype; break;
|
|
#ifdef DMFLOG
|
|
default: if (info) Log("GLB: %02X.%02X\n", info, infoval);
|
|
#endif
|
|
}
|
|
} else
|
|
{
|
|
glbinfobyte--;
|
|
}
|
|
// Parse channels
|
|
for (UINT i=0; i<tracks; i++) if (!infobyte[i])
|
|
{
|
|
MODCOMMAND cmd = {0,0,0,0,0,0};
|
|
BYTE info = lpStream[d++];
|
|
if (info & 0x80) infobyte[i] = lpStream[d++];
|
|
// Instrument
|
|
if (info & 0x40)
|
|
{
|
|
cmd.instr = lpStream[d++];
|
|
}
|
|
// Note
|
|
if (info & 0x20)
|
|
{
|
|
cmd.note = lpStream[d++];
|
|
if ((cmd.note) && (cmd.note < 0xfe)) cmd.note &= 0x7f;
|
|
if ((cmd.note) && (cmd.note < 128)) cmd.note += 24;
|
|
}
|
|
// Volume
|
|
if (info & 0x10)
|
|
{
|
|
cmd.volcmd = VOLCMD_VOLUME;
|
|
cmd.vol = (lpStream[d++]+3)>>2;
|
|
}
|
|
// Effect 1
|
|
if (info & 0x08)
|
|
{
|
|
BYTE efx = lpStream[d++];
|
|
BYTE eval = lpStream[d++];
|
|
switch(efx)
|
|
{
|
|
// 1: Key Off
|
|
case 1: if (!cmd.note) cmd.note = 0xFE; break;
|
|
// 2: Set Loop
|
|
// 4: Sample Delay
|
|
case 4: if (eval&0xe0) { cmd.command = CMD_S3MCMDEX; cmd.param = (eval>>5)|0xD0; } break;
|
|
// 5: Retrig
|
|
case 5: if (eval&0xe0) { cmd.command = CMD_RETRIG; cmd.param = (eval>>5); } break;
|
|
// 6: Offset
|
|
case 6: cmd.command = CMD_OFFSET; cmd.param = eval; break;
|
|
#ifdef DMFLOG
|
|
default: Log("FX1: %02X.%02X\n", efx, eval);
|
|
#endif
|
|
}
|
|
}
|
|
// Effect 2
|
|
if (info & 0x04)
|
|
{
|
|
BYTE efx = lpStream[d++];
|
|
BYTE eval = lpStream[d++];
|
|
switch(efx)
|
|
{
|
|
// 1: Finetune
|
|
case 1: if (eval&0xf0) { cmd.command = CMD_S3MCMDEX; cmd.param = (eval>>4)|0x20; } break;
|
|
// 2: Note Delay
|
|
case 2: if (eval&0xe0) { cmd.command = CMD_S3MCMDEX; cmd.param = (eval>>5)|0xD0; } break;
|
|
// 3: Arpeggio
|
|
case 3: if (eval) { cmd.command = CMD_ARPEGGIO; cmd.param = eval; } break;
|
|
// 4: Portamento Up
|
|
case 4: cmd.command = CMD_PORTAMENTOUP; cmd.param = (eval >= 0xe0) ? 0xdf : eval; break;
|
|
// 5: Portamento Down
|
|
case 5: cmd.command = CMD_PORTAMENTODOWN; cmd.param = (eval >= 0xe0) ? 0xdf : eval; break;
|
|
// 6: Tone Portamento
|
|
case 6: cmd.command = CMD_TONEPORTAMENTO; cmd.param = eval; break;
|
|
// 8: Vibrato
|
|
case 8: cmd.command = CMD_VIBRATO; cmd.param = eval; break;
|
|
// 12: Note cut
|
|
case 12: if (eval & 0xe0) { cmd.command = CMD_S3MCMDEX; cmd.param = (eval>>5)|0xc0; }
|
|
else if (!cmd.note) { cmd.note = 0xfe; } break;
|
|
#ifdef DMFLOG
|
|
default: Log("FX2: %02X.%02X\n", efx, eval);
|
|
#endif
|
|
}
|
|
}
|
|
// Effect 3
|
|
if (info & 0x02)
|
|
{
|
|
BYTE efx = lpStream[d++];
|
|
BYTE eval = lpStream[d++];
|
|
switch(efx)
|
|
{
|
|
// 1: Vol Slide Up
|
|
case 1: if (eval == 0xff) break;
|
|
eval = (eval+3)>>2; if (eval > 0x0f) eval = 0x0f;
|
|
cmd.command = CMD_VOLUMESLIDE; cmd.param = eval<<4; break;
|
|
// 2: Vol Slide Down
|
|
case 2: if (eval == 0xff) break;
|
|
eval = (eval+3)>>2; if (eval > 0x0f) eval = 0x0f;
|
|
cmd.command = CMD_VOLUMESLIDE; cmd.param = eval; break;
|
|
// 7: Set Pan
|
|
case 7: if (!cmd.volcmd) { cmd.volcmd = VOLCMD_PANNING; cmd.vol = (eval+3)>>2; }
|
|
else { cmd.command = CMD_PANNING8; cmd.param = eval; } break;
|
|
// 8: Pan Slide Left
|
|
case 8: eval = (eval+3)>>2; if (eval > 0x0f) eval = 0x0f;
|
|
cmd.command = CMD_PANNINGSLIDE; cmd.param = eval<<4; break;
|
|
// 9: Pan Slide Right
|
|
case 9: eval = (eval+3)>>2; if (eval > 0x0f) eval = 0x0f;
|
|
cmd.command = CMD_PANNINGSLIDE; cmd.param = eval; break;
|
|
#ifdef DMFLOG
|
|
default: Log("FX3: %02X.%02X\n", efx, eval);
|
|
#endif
|
|
|
|
}
|
|
}
|
|
// Store effect
|
|
if (i < m_nChannels) p[i] = cmd;
|
|
if (d > dwPos)
|
|
{
|
|
#ifdef DMFLOG
|
|
Log("Unexpected EOP: row=%d\n", row);
|
|
#endif
|
|
break;
|
|
}
|
|
} else
|
|
{
|
|
infobyte[i]--;
|
|
}
|
|
|
|
// Find free channel for tempo change
|
|
if (tempochange)
|
|
{
|
|
tempochange = FALSE;
|
|
UINT speed=6, modtempo=tempo;
|
|
UINT rpm = ((ttype) && (pbeat)) ? tempo*pbeat : (tempo+1)*15;
|
|
for (speed=30; speed>1; speed--)
|
|
{
|
|
modtempo = rpm*speed/24;
|
|
if (modtempo <= 200) break;
|
|
if ((speed < 6) && (modtempo < 256)) break;
|
|
}
|
|
#ifdef DMFLOG
|
|
Log("Tempo change: ttype=%d pbeat=%d tempo=%3d -> speed=%d tempo=%d\n",
|
|
ttype, pbeat, tempo, speed, modtempo);
|
|
#endif
|
|
for (UINT ich=0; ich<m_nChannels; ich++) if (!p[ich].command)
|
|
{
|
|
if (speed)
|
|
{
|
|
p[ich].command = CMD_SPEED;
|
|
p[ich].param = (BYTE)speed;
|
|
speed = 0;
|
|
} else
|
|
if ((modtempo >= 32) && (modtempo < 256))
|
|
{
|
|
p[ich].command = CMD_TEMPO;
|
|
p[ich].param = (BYTE)modtempo;
|
|
modtempo = 0;
|
|
} else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (d >= dwPos) break;
|
|
}
|
|
#ifdef DMFLOG
|
|
Log(" %d/%d bytes remaining\n", dwPos-d, pt->jmpsize);
|
|
#endif
|
|
if (dwPos + 8 >= dwMemLength) break;
|
|
}
|
|
dwMemPos += patt->patsize + 8;
|
|
}
|
|
break;
|
|
|
|
// "SMPI": Sample Info
|
|
case 0x49504d53:
|
|
{
|
|
DMFSMPI *pds = (DMFSMPI *)(lpStream+dwMemPos);
|
|
if (pds->size <= dwMemLength - dwMemPos)
|
|
{
|
|
DWORD dwPos = dwMemPos + 9;
|
|
m_nSamples = pds->samples;
|
|
if (m_nSamples >= MAX_SAMPLES) m_nSamples = MAX_SAMPLES-1;
|
|
for (UINT iSmp=1; iSmp<=m_nSamples; iSmp++)
|
|
{
|
|
UINT namelen = lpStream[dwPos];
|
|
smplflags[iSmp] = 0;
|
|
if (dwPos+namelen+1+sizeof(DMFSAMPLE) > dwMemPos+pds->size+8) break;
|
|
if (namelen)
|
|
{
|
|
UINT rlen = (namelen < 32) ? namelen : 31;
|
|
memcpy(m_szNames[iSmp], lpStream+dwPos+1, rlen);
|
|
m_szNames[iSmp][rlen] = 0;
|
|
}
|
|
dwPos += namelen + 1;
|
|
DMFSAMPLE *psh = (DMFSAMPLE *)(lpStream+dwPos);
|
|
MODINSTRUMENT *psmp = &Ins[iSmp];
|
|
psmp->nLength = psh->len;
|
|
psmp->nLoopStart = psh->loopstart;
|
|
psmp->nLoopEnd = psh->loopend;
|
|
psmp->nC4Speed = psh->c3speed;
|
|
psmp->nGlobalVol = 64;
|
|
psmp->nVolume = (psh->volume) ? ((WORD)psh->volume)+1 : (WORD)256;
|
|
psmp->uFlags = (psh->flags & 2) ? CHN_16BIT : 0;
|
|
if (psmp->uFlags & CHN_16BIT) psmp->nLength >>= 1;
|
|
if (psh->flags & 1) psmp->uFlags |= CHN_LOOP;
|
|
smplflags[iSmp] = psh->flags;
|
|
dwPos += (pfh->version < 8) ? 22 : 30;
|
|
#ifdef DMFLOG
|
|
Log("SMPI %d/%d: len=%d flags=0x%02X\n", iSmp, m_nSamples, psmp->nLength, psh->flags);
|
|
#endif
|
|
}
|
|
}
|
|
dwMemPos += pds->size + 8;
|
|
}
|
|
break;
|
|
|
|
// "SMPD": Sample Data
|
|
case 0x44504d53:
|
|
{
|
|
DWORD dwPos = dwMemPos + 8;
|
|
UINT ismpd = 0;
|
|
for (UINT iSmp=1; iSmp<=m_nSamples; iSmp++)
|
|
{
|
|
ismpd++;
|
|
DWORD pksize;
|
|
if (dwPos + 4 >= dwMemLength)
|
|
{
|
|
#ifdef DMFLOG
|
|
Log("Unexpected EOF at sample %d/%d! (pos=%d)\n", iSmp, m_nSamples, dwPos);
|
|
#endif
|
|
break;
|
|
}
|
|
pksize = *((LPDWORD)(lpStream+dwPos));
|
|
#ifdef DMFLOG
|
|
Log("sample %d: pos=0x%X pksize=%d ", iSmp, dwPos, pksize);
|
|
Log("len=%d flags=0x%X [%08X]\n", Ins[iSmp].nLength, smplflags[ismpd], *((LPDWORD)(lpStream+dwPos+4)));
|
|
#endif
|
|
dwPos += 4;
|
|
if (pksize > dwMemLength - dwPos)
|
|
{
|
|
#ifdef DMFLOG
|
|
Log("WARNING: pksize=%d, but only %d bytes left\n", pksize, dwMemLength-dwPos);
|
|
#endif
|
|
pksize = dwMemLength - dwPos;
|
|
}
|
|
if ((pksize) && (iSmp <= m_nSamples))
|
|
{
|
|
UINT flags = (Ins[iSmp].uFlags & CHN_16BIT) ? RS_PCM16S : RS_PCM8S;
|
|
if (smplflags[ismpd] & 4) flags = (Ins[iSmp].uFlags & CHN_16BIT) ? RS_DMF16 : RS_DMF8;
|
|
ReadSample(&Ins[iSmp], flags, (LPSTR)(lpStream+dwPos), pksize);
|
|
}
|
|
dwPos += pksize;
|
|
}
|
|
dwMemPos = dwPos;
|
|
}
|
|
break;
|
|
|
|
// "ENDE": end of file
|
|
case 0x45444e45:
|
|
goto dmfexit;
|
|
|
|
// Unrecognized id, or "ENDE" field
|
|
default:
|
|
dwMemPos += 4;
|
|
break;
|
|
}
|
|
}
|
|
dmfexit:
|
|
if (!m_nChannels)
|
|
{
|
|
if (!m_nSamples)
|
|
{
|
|
m_nType = MOD_TYPE_NONE;
|
|
return FALSE;
|
|
}
|
|
m_nChannels = 4;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
// DMF Compression
|
|
|
|
#pragma pack(1)
|
|
|
|
typedef struct DMF_HNODE
|
|
{
|
|
short int left, right;
|
|
BYTE value;
|
|
} DMF_HNODE;
|
|
|
|
typedef struct DMF_HTREE
|
|
{
|
|
LPBYTE ibuf, ibufmax;
|
|
DWORD bitbuf;
|
|
UINT bitnum;
|
|
UINT lastnode, nodecount;
|
|
DMF_HNODE nodes[256];
|
|
} DMF_HTREE;
|
|
|
|
#pragma pack()
|
|
|
|
|
|
// DMF Huffman ReadBits
|
|
BYTE DMFReadBits(DMF_HTREE *tree, UINT nbits)
|
|
//-------------------------------------------
|
|
{
|
|
BYTE x = 0, bitv = 1;
|
|
while (nbits--)
|
|
{
|
|
if (tree->bitnum)
|
|
{
|
|
tree->bitnum--;
|
|
} else
|
|
{
|
|
tree->bitbuf = (tree->ibuf < tree->ibufmax) ? *(tree->ibuf++) : 0;
|
|
tree->bitnum = 7;
|
|
}
|
|
if (tree->bitbuf & 1) x |= bitv;
|
|
bitv <<= 1;
|
|
tree->bitbuf >>= 1;
|
|
}
|
|
return x;
|
|
}
|
|
|
|
//
|
|
// tree: [8-bit value][12-bit index][12-bit index] = 32-bit
|
|
//
|
|
|
|
void DMFNewNode(DMF_HTREE *tree)
|
|
//------------------------------
|
|
{
|
|
BYTE isleft, isright;
|
|
UINT actnode;
|
|
|
|
actnode = tree->nodecount;
|
|
if (actnode > 255) return;
|
|
tree->nodes[actnode].value = DMFReadBits(tree, 7);
|
|
isleft = DMFReadBits(tree, 1);
|
|
isright = DMFReadBits(tree, 1);
|
|
actnode = tree->lastnode;
|
|
if (actnode > 255) return;
|
|
tree->nodecount++;
|
|
tree->lastnode = tree->nodecount;
|
|
if (isleft)
|
|
{
|
|
tree->nodes[actnode].left = tree->lastnode;
|
|
DMFNewNode(tree);
|
|
} else
|
|
{
|
|
tree->nodes[actnode].left = -1;
|
|
}
|
|
tree->lastnode = tree->nodecount;
|
|
if (isright)
|
|
{
|
|
tree->nodes[actnode].right = tree->lastnode;
|
|
DMFNewNode(tree);
|
|
} else
|
|
{
|
|
tree->nodes[actnode].right = -1;
|
|
}
|
|
}
|
|
|
|
|
|
int DMFUnpack(LPBYTE psample, LPBYTE ibuf, LPBYTE ibufmax, UINT maxlen)
|
|
//----------------------------------------------------------------------
|
|
{
|
|
DMF_HTREE tree;
|
|
UINT actnode;
|
|
BYTE value, sign, delta = 0;
|
|
|
|
memset(&tree, 0, sizeof(tree));
|
|
tree.ibuf = ibuf;
|
|
tree.ibufmax = ibufmax;
|
|
DMFNewNode(&tree);
|
|
value = 0;
|
|
for (UINT i=0; i<maxlen; i++)
|
|
{
|
|
actnode = 0;
|
|
sign = DMFReadBits(&tree, 1);
|
|
do
|
|
{
|
|
if (DMFReadBits(&tree, 1))
|
|
actnode = tree.nodes[actnode].right;
|
|
else
|
|
actnode = tree.nodes[actnode].left;
|
|
if (actnode > 255) break;
|
|
delta = tree.nodes[actnode].value;
|
|
if ((tree.ibuf >= tree.ibufmax) && (!tree.bitnum)) break;
|
|
} while ((tree.nodes[actnode].left >= 0) && (tree.nodes[actnode].right >= 0));
|
|
if (sign) delta ^= 0xFF;
|
|
value += delta;
|
|
psample[i] = (i) ? value : 0;
|
|
}
|
|
#ifdef DMFLOG
|
|
// Log("DMFUnpack: %d remaining bytes\n", tree.ibufmax-tree.ibuf);
|
|
#endif
|
|
return tree.ibuf - ibuf;
|
|
}
|
|
|
|
|