96 lines
1.8 KiB
C++
96 lines
1.8 KiB
C++
#include "main.h"
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#include "cvt.h"
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bool is_mids(const BYTE* buf,size_t s)
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{
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return s>0x20 && *(DWORD*)buf==_rv('RIFF') && *(DWORD*)(buf+8)==_rv('MIDS') && *(DWORD*)(buf+12)==_rv('fmt ');
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}
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typedef struct
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{
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DWORD dwTimeFormat;
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DWORD cbMaxBuffer;
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DWORD dwFlags;
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} MIDSFMT;
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#define WRITE(X,Y) out.write(X,Y)
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#define WRITE_DELTA(X) gb_write_delta(out,X)
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#define D_WRITE {WRITE_DELTA(ct-tw);tw=ct;}
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bool load_mids(MIDI_file* mf,const BYTE* buf,size_t sz)
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{
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if (sz<*(long*)(buf+4)+8) return 0;
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MIDSFMT* fmt=(MIDSFMT*)(buf+0x14);
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DWORD ofs;
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ofs=*(DWORD*)(buf+0x10)+0x14;
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if (*(DWORD*)(buf+ofs)!=_rv('data')) return 0;
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//ofs+=8+*(DWORD*)(buf+ofs+4);
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ofs+=8;
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DWORD ss=*(DWORD*)(buf+ofs-4);
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DWORD nc=*(DWORD*)(buf+ofs);
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DWORD* ptr=(DWORD*)(buf+ofs);
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grow_buf out;
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ss>>=2;
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DWORD mhdr[2];
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mhdr[0]=_rv('MThd');
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mhdr[1]=_rv(6);
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WRITE(mhdr,8);
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WORD w=0;
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WRITE(&w,2);
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w=0x100;
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WRITE(&w,2);
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w=rev16((WORD)fmt->dwTimeFormat);
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WRITE(&w,2);
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mhdr[0]=_rv('MTrk');
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WRITE(mhdr,8);
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DWORD tw=0,ct=0;
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DWORD cc=0;
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DWORD cs;
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DWORD pos=1;
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while(cc<nc)
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{
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cs = (ptr[pos+1]>>2)+pos;
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if (cs>ss) break;
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pos+=2;
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while(pos<cs)
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{
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ct+=ptr[pos];
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pos+=2;
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DWORD e=ptr[pos];
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if (e&MEVT_F_LONG)
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{
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pos+=e&0xFFFFFF;
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}
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else
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{
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if (e>>24==MEVT_TEMPO)
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{
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D_WRITE;
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BYTE tmp[6]={0xFF,0x51,0x03,(BYTE)((e>>16)&0xFF),(BYTE)((e>>8)&0xFF),(BYTE)(e&0xFF)};
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WRITE(tmp,6);
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}
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else if (!(e>>24))
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{
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BYTE c=(BYTE)(e&0xF0);
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if (c!=0xF0)
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{
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D_WRITE;
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DWORD l=(c==0xC0 || c==0xD0) ? 2 : 3;
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WRITE(&e,l);
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}
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}
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pos++;
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}
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}
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}
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WRITE("\x00\xFF\x2F",4);
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out.write_dword_ptr(rev32(out.get_size()-(8+6+8)),8+6+4);
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mf->size = out.get_size();
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mf->data = (BYTE*)out.finish();
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return !!mf->data;
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} |