48 lines
990 B
C++
48 lines
990 B
C++
#include "main.h"
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#include "cvt.h"
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bool is_cmf(const BYTE* buf,size_t s)
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{
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return s>0x20 && *(DWORD*)buf == _rv('CTMF');
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}
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static BYTE tempodat[7]={0,0xFF,0x51,0x03,0,0,0};
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bool load_cmf(MIDI_file * mf,const BYTE* ptr,size_t sz)
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{
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if (sz < 14)
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return 0;
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WORD music_offset = *(WORD*)(ptr+8);
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if ((size_t)music_offset > sz)
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return 0;
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const BYTE* _t=ptr+music_offset;
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size_t total_size=sz - music_offset;
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mf->size=14+8+7+total_size;
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BYTE* _pt=(BYTE*)malloc(mf->size);
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if (!_pt) return 0;
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mf->data=_pt;
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*(DWORD*)_pt=_rv('MThd');
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_pt+=4;
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*(DWORD*)_pt=_rv(6);
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_pt+=4;
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*(WORD*)_pt=0;
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_pt+=2;
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*(WORD*)_pt=0x0100;
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_pt+=2;
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*(WORD*)_pt=rev16(*(WORD*)(ptr+10));
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_pt+=2;
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*(DWORD*)_pt=_rv('MTrk');
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_pt+=4;
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*(DWORD*)_pt=rev32(total_size+7);
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_pt+=4;
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DWORD tm=(DWORD)(48000000/(*(WORD*)(ptr+12)));
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tempodat[4]=(BYTE)((tm>>16)&0xFF);
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tempodat[5]=(BYTE)((tm>>8)&0xFF);
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tempodat[6]=(BYTE)(tm&0xFF);
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memcpy(_pt,tempodat,7);
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_pt+=7;
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memcpy(_pt,_t,total_size);
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return 1;
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} |