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#include "main.h"
#include "cvt.h"
bool is_mus(const BYTE* buf,size_t s)
{
if (s>0x20 && *(DWORD*)buf == '\x1ASUM')
{
int ofs = ((WORD*)buf)[3];
int n_ins = ((WORD*)buf)[6];
if (ofs>=16+(n_ins<<1) && ofs<16+(n_ins<<2) && ofs<s)
{
return 1;
}
}
return 0;
}
static BYTE tempodat[] = {0x00,0xFF,0x51,0x03,0x09,0xA3,0x1A};
static BYTE controllers[15] = {0,0,1,7,10,11,91,93,64,67,120,123,126,127,121};
#define abort _abort_
struct MUS_cvt
{
public:
bool abort;
DWORD ct;
DWORD lt;
grow_buf out;
void AddEvent(DWORD ev,int l);
bool run(MIDI_file* mf,const BYTE* ptr,DWORD sz);
};
void MUS_cvt::AddEvent(DWORD ev,int l)
{
DWORD dt = ct - lt;
int tl=3;
gb_write_delta(out,dt);
lt = ct;
BYTE ec=(BYTE)(ev&0xF0);
out.write(&ev,l);
}
bool MUS_cvt::run(MIDI_file* mf,const BYTE* ptr,DWORD sz)
{
#pragma pack(push)
#pragma pack(1)
struct
{
char id[4];
WORD len;
WORD ofs;
WORD ch1,ch2;
WORD n_ins;
WORD dummy;
} hdr;
#pragma pack(pop)
DWORD _pt=0;
memcpy(&hdr,ptr,sizeof(hdr));
const BYTE* score = ptr+sizeof(hdr)+2*hdr.n_ins;
long x;
static BYTE _hd_[]={'M','T','h','d',0,0,0,6, 0,0,0,1,0,0x59,'M','T','r','k'};
out.write(_hd_,sizeof(_hd_));
DWORD ts_ofs=out.get_size();
out.write_dword(0);
lt=0;
abort = 0;
ct = 0;
out.write(tempodat,sizeof(tempodat));
x=0;
bool t;
BYTE ch;
BYTE vols[16];
ZeroMemory(vols,sizeof(vols));
union
{
BYTE b[4];
DWORD dw;
} ev;
while(x<hdr.len && score[x]!=0x60)
{
ev.dw = 0;
t=(score[x]&0x80)?1:0;
ch = score[x]&0xF;
if (ch == 0xF) ch = 9;//hdr.ch1+1;
else if (ch>=9) ch++;
switch(score[x]&0x70)
{
case 0: //release note
ev.b[0]=0x80|ch;
ev.b[1]=score[x+1];
ev.b[2]=0;//vols[ch];
AddEvent(ev.dw,3);
x+=2;
break;
case 0x10: //play note
ev.b[0]=0x90|ch;
ev.b[1]=score[x+1]&0x7F;
if (score[x+1]&0x80)
{
vols[ch]=score[x+2];
x+=3;
}
else
{
x+=2;
}
ev.b[2]=vols[ch];
AddEvent(ev.dw,3);
break;
case 0x20: //pitch wheel
ev.b[0]=0xE0|ch;
ev.b[1]=0;
ev.b[2]=score[x+1]>>1;
AddEvent(ev.dw,3);
x+=2;
break;
case 0x30: //system event
if (score[x+1]>=10 && score[x+1]<=14)
{
ev.b[0]=0xB0|ch;
ev.b[1]=controllers[score[x+1]];
ev.b[2]=1;
AddEvent(ev.dw,3);
x+=2;
break;
}
else return 0;
case 0x40: //change controller
if (score[x+1])
{
if (score[x+1]<10)
{
ev.b[0]=0xB0|ch;
ev.b[1]=controllers[score[x+1]];
ev.b[2]=score[x+2];
AddEvent(ev.dw,3);
x+=3;
}
else return 0;
}
else
{
ev.b[0]=0xC0|ch;
ev.b[1]=score[x+2];
AddEvent(ev.dw,2);
x+=3;
};
break;
case 0x50:
case 0x70:
case 0x60:
return 0;
}
if (abort) return 0;
if (t)
{
DWORD dt=0;
do
{
dt = (dt<<7) + (score[x]&0x7F);
} while(score[x++]&0x80);
ct+=dt;
}
}
out.write_dword(0x002FFF00);
out.write_dword_ptr(rev32(out.get_size()-(ts_ofs+4)),ts_ofs);
mf->size = out.get_size();
mf->data = (BYTE*)out.finish();
return !!mf->data;
}
bool load_mus(MIDI_file* mf,const BYTE* ptr,size_t sz)
{
MUS_cvt c;
return c.run(mf,ptr,sz);
}
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