adding modplug

Original commit message from CVS:
adding modplug

1 files changed, 186 insertions, 0 deletions

diff --git a/gst/modplug/libmodplug/load_stm.cpp b/gst/modplug/libmodplug/load_stm.cpp
new file mode 100644
index 00000000..10e3d555
--- /dev/null
+++ b/gst/modplug/libmodplug/load_stm.cpp
@@ -0,0 +1,186 @@
+/*
+ * This source code is public domain.
+ *
+ * Authors: Olivier Lapicque <olivierl@jps.net>
+*/
+
+#include "stdafx.h"
+#include "sndfile.h"
+
+//#pragma warning(disable:4244)
+
+#pragma pack(1)
+
+typedef struct tagSTMNOTE
+{
+	BYTE note;
+	BYTE insvol;
+	BYTE volcmd;
+	BYTE cmdinf;
+} STMNOTE;
+
+
+// Raw STM sampleinfo struct:
+typedef struct tagSTMSAMPLE
+{
+	CHAR filename[14];	// Can't have long comments - just filename comments :)
+	WORD reserved;		// ISA in memory when in ST 2
+	WORD length;		// Sample length
+	WORD loopbeg;		// Loop start point
+	WORD loopend;		// Loop end point
+	BYTE volume;		// Volume
+	BYTE reserved2;		// More reserved crap
+	WORD c2spd;			// Good old c2spd
+	BYTE reserved3[6];	// Yet more of PSi's reserved crap
+} STMSAMPLE;
+
+
+// Raw STM header struct:
+typedef struct tagSTMHEADER
+{
+        char songname[20];      // changed from CHAR
+	char trackername[8];	// !SCREAM! for ST 2.xx  // changed from CHAR
+	CHAR unused;			// 0x1A
+	CHAR filetype;			// 1=song, 2=module (only 2 is supported, of course) :)
+	CHAR ver_major;			// Like 2
+	CHAR ver_minor;			// "ditto"
+	BYTE inittempo;			// initspeed= stm inittempo>>4
+	BYTE numpat;			// number of patterns
+	BYTE globalvol;			// <- WoW! a RiGHT TRiANGLE =8*)
+	BYTE reserved[13];		// More of PSi's internal crap
+	STMSAMPLE sample[31];	// STM sample data
+	BYTE patorder[128];		// Docs say 64 - actually 128
+} STMHEADER;
+
+#pragma pack()
+
+
+
+BOOL CSoundFile::ReadSTM(const BYTE *lpStream, DWORD dwMemLength)
+//---------------------------------------------------------------
+{
+	STMHEADER *phdr = (STMHEADER *)lpStream;
+	DWORD dwMemPos = 0;
+	
+	if ((!lpStream) || (dwMemLength < sizeof(STMHEADER))) return FALSE;
+	if ((phdr->filetype != 2) || (phdr->unused != 0x1A)
+	 || ((strnicmp(phdr->trackername, "!SCREAM!", 8))
+	  && (strnicmp(phdr->trackername, "BMOD2STM", 8)))) return FALSE;
+	memcpy(m_szNames[0], phdr->songname, 20);
+	// Read STM header
+	m_nType = MOD_TYPE_STM;
+	m_nSamples = 31;
+	m_nChannels = 4;
+	m_nInstruments = 0;
+	m_nMinPeriod = 64;
+	m_nMaxPeriod = 0x7FFF;
+	m_nDefaultSpeed = phdr->inittempo >> 4;
+	if (m_nDefaultSpeed < 1) m_nDefaultSpeed = 1;
+	m_nDefaultTempo = 125;
+	m_nDefaultGlobalVolume = phdr->globalvol << 2;
+	if (m_nDefaultGlobalVolume > 256) m_nDefaultGlobalVolume = 256;
+	memcpy(Order, phdr->patorder, 128);
+	// Setting up channels
+	for (UINT nSet=0; nSet<4; nSet++)
+	{
+		ChnSettings[nSet].dwFlags = 0;
+		ChnSettings[nSet].nVolume = 64;
+		ChnSettings[nSet].nPan = (nSet & 1) ? 0x40 : 0xC0;
+	}
+	// Reading samples
+	for (UINT nIns=0; nIns<31; nIns++)
+	{
+		MODINSTRUMENT *pIns = &Ins[nIns+1];
+		STMSAMPLE *pStm = &phdr->sample[nIns];  // STM sample data
+		memcpy(pIns->name, pStm->filename, 13);
+		memcpy(m_szNames[nIns+1], pStm->filename, 12);
+		pIns->nC4Speed = pStm->c2spd;
+		pIns->nGlobalVol = 64;
+		pIns->nVolume = pStm->volume << 2;
+		if (pIns->nVolume > 256) pIns->nVolume = 256;
+		pIns->nLength = pStm->length;
+		if ((pIns->nLength < 4) || (!pIns->nVolume)) pIns->nLength = 0;
+		pIns->nLoopStart = pStm->loopbeg;
+		pIns->nLoopEnd = pStm->loopend;
+		if ((pIns->nLoopEnd > pIns->nLoopStart) && (pIns->nLoopEnd != 0xFFFF)) pIns->uFlags |= CHN_LOOP;
+	}
+	dwMemPos = sizeof(STMHEADER);
+	for (UINT nOrd=0; nOrd<MAX_ORDERS; nOrd++) if (Order[nOrd] >= 99) Order[nOrd] = 0xFF;
+	UINT nPatterns = phdr->numpat;
+	for (UINT nPat=0; nPat<nPatterns; nPat++)
+	{
+		if (dwMemPos + 64*4*4 > dwMemLength) return TRUE;
+		PatternSize[nPat] = 64;
+		if ((Patterns[nPat] = AllocatePattern(64, m_nChannels)) == NULL) return TRUE;
+		MODCOMMAND *m = Patterns[nPat];
+		STMNOTE *p = (STMNOTE *)(lpStream + dwMemPos);
+		for (UINT n=0; n<64*4; n++, p++, m++)
+		{
+			UINT note,ins,vol,cmd;
+			// extract the various information from the 4 bytes that
+			// make up a single note
+			note = p->note;
+			ins = p->insvol >> 3;
+			vol = (p->insvol & 0x07) + (p->volcmd >> 1);
+			cmd = p->volcmd & 0x0F;
+			if ((ins) && (ins < 32)) m->instr = ins;
+			// special values of [SBYTE0] are handled here ->
+			// we have no idea if these strange values will ever be encountered
+			// but it appears as though stms sound correct.
+			if ((note == 0xFE) || (note == 0xFC)) m->note = 0xFE; else
+			// if note < 251, then all three bytes are stored in the file
+			if (note < 0xFC) m->note = (note >> 4)*12 + (note&0xf) + 37;
+			if (vol <= 64) { m->volcmd = VOLCMD_VOLUME; m->vol = vol; }
+			m->param = p->cmdinf;
+			switch(cmd)
+			{
+			// Axx set speed to xx
+			case 1:	m->command = CMD_SPEED; m->param >>= 4; break;
+			// Bxx position jump
+			case 2:	m->command = CMD_POSITIONJUMP; break;
+			// Cxx patternbreak to row xx
+			case 3:	m->command = CMD_PATTERNBREAK; m->param = (m->param & 0xF0) * 10 + (m->param & 0x0F);	break;
+			// Dxy volumeslide
+			case 4:	m->command = CMD_VOLUMESLIDE; break;
+			// Exy toneslide down
+			case 5:	m->command = CMD_PORTAMENTODOWN; break;
+			// Fxy toneslide up
+			case 6:	m->command = CMD_PORTAMENTOUP; break;
+			// Gxx Tone portamento,speed xx
+			case 7:	m->command = CMD_TONEPORTAMENTO; break;
+			// Hxy vibrato
+			case 8:	m->command = CMD_VIBRATO; break;
+			// Ixy tremor, ontime x, offtime y
+			case 9:	m->command = CMD_TREMOR; break;
+			// Jxy arpeggio
+			case 10: m->command = CMD_ARPEGGIO; break;
+			// Kxy Dual command H00 & Dxy
+			case 11: m->command = CMD_VIBRATOVOL; break;
+			// Lxy Dual command G00 & Dxy
+			case 12: m->command = CMD_TONEPORTAVOL; break;
+			// Xxx amiga command 8xx
+			case 0x18:	m->command = CMD_PANNING8; break;
+			default:
+				m->command = m->param = 0;
+			}
+		}
+		dwMemPos += 64*4*4;
+	}
+	// Reading Samples
+	for (UINT nSmp=1; nSmp<=31; nSmp++)
+	{
+		MODINSTRUMENT *pIns = &Ins[nSmp];
+		dwMemPos = (dwMemPos + 15) & (~15);
+		if (pIns->nLength)
+		{
+			UINT nPos = ((UINT)phdr->sample[nSmp-1].reserved) << 4;
+			if ((nPos >= sizeof(STMHEADER)) && (nPos+pIns->nLength <= dwMemLength)) dwMemPos = nPos;
+			if (dwMemPos < dwMemLength)
+			{
+				dwMemPos += ReadSample(pIns, RS_PCM8S, (LPSTR)(lpStream+dwMemPos),dwMemLength-dwMemPos);
+			}
+		}
+	}
+	return TRUE;
+}
+