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load_mtm.cpp
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load_mtm.cpp
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/*
* This source code is public domain.
*
* Authors: Olivier Lapicque <[email protected]>
*/
#include "stdafx.h"
#include "sndfile.h"
//#pragma warning(disable:4244)
//////////////////////////////////////////////////////////
// MTM file support (import only)
#pragma pack(1)
typedef struct tagMTMSAMPLE
{
char samplename[22]; // changed from CHAR
DWORD length;
DWORD reppos;
DWORD repend;
CHAR finetune;
BYTE volume;
BYTE attribute;
} MTMSAMPLE;
typedef struct tagMTMHEADER
{
char id[4]; // MTM file marker + version // changed from CHAR
char songname[20]; // ASCIIZ songname // changed from CHAR
WORD numtracks; // number of tracks saved
BYTE lastpattern; // last pattern number saved
BYTE lastorder; // last order number to play (songlength-1)
WORD commentsize; // length of comment field
BYTE numsamples; // number of samples saved
BYTE attribute; // attribute byte (unused)
BYTE beatspertrack;
BYTE numchannels; // number of channels used
BYTE panpos[32]; // voice pan positions
} MTMHEADER;
#pragma pack()
BOOL CSoundFile::ReadMTM(LPCBYTE lpStream, DWORD dwMemLength)
//-----------------------------------------------------------
{
MTMHEADER *pmh = (MTMHEADER *)lpStream;
DWORD dwMemPos = 66;
if ((!lpStream) || (dwMemLength < 0x100)) return FALSE;
if ((strncmp(pmh->id, "MTM", 3)) || (pmh->numchannels > 32)
|| (pmh->numsamples >= MAX_SAMPLES) || (!pmh->numsamples)
|| (!pmh->numtracks) || (!pmh->numchannels)
|| (!pmh->lastpattern) || (pmh->lastpattern > MAX_PATTERNS))
return FALSE;
strncpy(m_szNames[0], pmh->songname, 20);
m_szNames[0][20] = 0;
if (dwMemPos + 37*pmh->numsamples + 128 + 192*pmh->numtracks
+ 64 * (pmh->lastpattern+1) + pmh->commentsize >= dwMemLength)
return FALSE;
m_nType = MOD_TYPE_MTM;
m_nSamples = pmh->numsamples;
m_nChannels = pmh->numchannels;
// Reading instruments
for (UINT i=1; i<=m_nSamples; i++)
{
MTMSAMPLE *pms = (MTMSAMPLE *)(lpStream + dwMemPos);
strncpy(m_szNames[i], pms->samplename, 22);
m_szNames[i][22] = 0;
Ins[i].nVolume = pms->volume << 2;
Ins[i].nGlobalVol = 64;
DWORD len = pms->length;
if ((len > 4) && (len <= MAX_SAMPLE_LENGTH))
{
Ins[i].nLength = len;
Ins[i].nLoopStart = pms->reppos;
Ins[i].nLoopEnd = pms->repend;
if (Ins[i].nLoopEnd > Ins[i].nLength)
Ins[i].nLoopEnd = Ins[i].nLength;
if (Ins[i].nLoopStart + 4 >= Ins[i].nLoopEnd)
Ins[i].nLoopStart = Ins[i].nLoopEnd = 0;
if (Ins[i].nLoopEnd) Ins[i].uFlags |= CHN_LOOP;
Ins[i].nFineTune = MOD2XMFineTune(pms->finetune);
if (pms->attribute & 0x01)
{
Ins[i].uFlags |= CHN_16BIT;
Ins[i].nLength >>= 1;
Ins[i].nLoopStart >>= 1;
Ins[i].nLoopEnd >>= 1;
}
Ins[i].nPan = 128;
}
dwMemPos += 37;
}
// Setting Channel Pan Position
for (UINT ich=0; ich<m_nChannels; ich++)
{
ChnSettings[ich].nPan = ((pmh->panpos[ich] & 0x0F) << 4) + 8;
ChnSettings[ich].nVolume = 64;
}
// Reading pattern order
memcpy(Order, lpStream + dwMemPos, pmh->lastorder+1);
dwMemPos += 128;
// Reading Patterns
LPCBYTE pTracks = lpStream + dwMemPos;
dwMemPos += 192 * pmh->numtracks;
LPWORD pSeq = (LPWORD)(lpStream + dwMemPos);
for (UINT pat=0; pat<=pmh->lastpattern; pat++)
{
PatternSize[pat] = 64;
if ((Patterns[pat] = AllocatePattern(64, m_nChannels)) == NULL) break;
for (UINT n=0; n<32; n++) if ((pSeq[n]) && (pSeq[n] <= pmh->numtracks) && (n < m_nChannels))
{
LPCBYTE p = pTracks + 192 * (pSeq[n]-1);
MODCOMMAND *m = Patterns[pat] + n;
for (UINT i=0; i<64; i++, m+=m_nChannels, p+=3)
{
if (p[0] & 0xFC) m->note = (p[0] >> 2) + 37;
m->instr = ((p[0] & 0x03) << 4) | (p[1] >> 4);
UINT cmd = p[1] & 0x0F;
UINT param = p[2];
if (cmd == 0x0A)
{
if (param & 0xF0) param &= 0xF0; else param &= 0x0F;
}
m->command = cmd;
m->param = param;
if ((cmd) || (param)) ConvertModCommand(m);
}
}
pSeq += 32;
}
dwMemPos += 64*(pmh->lastpattern+1);
if ((pmh->commentsize) && (dwMemPos + pmh->commentsize < dwMemLength))
{
UINT n = pmh->commentsize;
m_lpszSongComments = new char[n+1];
if (m_lpszSongComments)
{
memcpy(m_lpszSongComments, lpStream+dwMemPos, n);
m_lpszSongComments[n] = 0;
for (UINT i=0; i<n; i++)
{
if (!m_lpszSongComments[i])
{
m_lpszSongComments[i] = ((i+1) % 40) ? 0x20 : 0x0D;
}
}
}
}
dwMemPos += pmh->commentsize;
// Reading Samples
for (UINT ismp=1; ismp<=m_nSamples; ismp++)
{
if (dwMemPos >= dwMemLength) break;
dwMemPos += ReadSample(&Ins[ismp], (Ins[ismp].uFlags & CHN_16BIT) ? RS_PCM16U : RS_PCM8U,
(LPSTR)(lpStream + dwMemPos), dwMemLength - dwMemPos);
}
m_nMinPeriod = 64;
m_nMaxPeriod = 32767;
return TRUE;
}