diff options
Diffstat (limited to 'lib/libmodplug/src/load_mtm.cpp')
| -rw-r--r-- | lib/libmodplug/src/load_mtm.cpp | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/lib/libmodplug/src/load_mtm.cpp b/lib/libmodplug/src/load_mtm.cpp new file mode 100644 index 0000000000..f5f0299e23 --- /dev/null +++ b/lib/libmodplug/src/load_mtm.cpp @@ -0,0 +1,168 @@ +/* + * This source code is public domain. + * + * Authors: Olivier Lapicque <olivierl@jps.net> +*/ + +#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; +} + |