28 lines
694 B
C++
28 lines
694 B
C++
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#include "main.h"
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#include "cvt.h"
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bool is_gmf(const BYTE* p,size_t s)
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{
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return s>0x20 && *(DWORD*)p==_rv('GMF\x01');
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}
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bool load_gmf(MIDI_file * mf,const BYTE* buf,size_t siz)
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{
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grow_buf wb;
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wb.write_dword(_rv('MThd'));
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wb.write_dword(_rv(6));
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MIDIHEADER h={0x000,0x100,0xC000};
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wb.write(&h,6);
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wb.write_dword(_rv('MTrk'));
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int tempo=100000*rev16(*(WORD*)(buf+4));
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wb.write_dword(rev32(siz-9+8+3));//MTrk size
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BYTE tempo_event[8]={0,0xFF,0x51,0x03,(BYTE)((tempo>>16)&0xFF),(BYTE)((tempo>>8)&0xFF),(BYTE)(tempo&0xFF),0};
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wb.write(tempo_event,8);
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wb.write(buf+8,siz-9);
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wb.write("\xFF\x2F\x00",3);
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mf->size = wb.get_size();
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mf->data = (BYTE*)wb.finish();
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return !!mf->data;
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}
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