326 lines
6.3 KiB
C++
326 lines
6.3 KiB
C++
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#include "main.h"
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#include <intsafe.h>
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#define _RIFF 'FFIR'
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#define _MThd 'dhTM'
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#define _MTrk 'krTM'
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#define _RMID 'DIMR'
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#define _data 'atad'
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//#define BLAH
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static cfg_int cfg_loop_ctrl("cfg_loop_ctrl",255),cfg_loop_meta("cfg_loop_meta",255);
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class CGetInfo
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{
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public:
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MIDI_file * mf;
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int loop;
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int nch;
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int got_notes;
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int cur_track_start;
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int c_track,s_track;
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bool is_blah,f2;
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int max_ff_track,max_ff_num;
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CTempoMap *tmap,*ttmap;
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CSysexMap *smap;
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void CleanTempo();
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int DoTrack(const BYTE* track,size_t size,string& name,int);
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bool Run(MIDI_file* mf);
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};
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static bool memicmp(char* b1,char* b2,int s)
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{
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for(int n = 0; n < s; n++)
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{
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if (tolower(b1[n]) != tolower(b2[n]))
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return 1;
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}
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return 0;
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}
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static bool is_kar(char* ptr,int siz) //hack
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{
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siz -= 7;//strlen("karaoke");
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for(int n = 0; n <= siz; n++)
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{
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// lameness to just prevent a crash on broken
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// files no idea what else it'll break though
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if ((int)(ptr+n) > siz) return 0;
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if (!memicmp(ptr+n,"karaoke",7)) return 1;
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}
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return 0;
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}
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extern cfg_int cfg_ff7loopz;
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BYTE ff7loopstart[12]={0xFF,6,9,'l','o','o','p','S','t','a','r','t'};
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BYTE ff7loopend[10]={0xFF,6,7,'l','o','o','p','E','n','d'};
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int CGetInfo::DoTrack(const BYTE* track,size_t size,string& name,int cpos)
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{
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int res=0,_res=0;
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size_t n=0;
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BYTE lc1=0,lastcom=0;
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bool run=0;
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int ff_num=0;
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while(n<size)
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{
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{
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unsigned int d=0;
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unsigned int _n=DecodeDelta(track+n,&d);
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if (_n<4) res+=d;
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n+=_n;
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}
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if (track[n]==0xFF) //meta-events
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{
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if (f2) _res=res;
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if (cfg_ff7loopz
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&& (size-n)>=sizeof(ff7loopstart) // bounds check
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&& !memcmp(&track[n],ff7loopstart,sizeof(ff7loopstart)))
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{
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if (loop==-1) loop=res;
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}
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if ((UINT)track[n+1]==(UINT)cfg_loop_meta && loop==-1) loop=res;
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if (track[n+1]==0x51 && track[n+2]==0x03) //tempo
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{
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if (ttmap) ttmap->AddEntry(cpos+res,((DWORD)track[n+3]<<16)+((DWORD)track[n+4]<<8)+((DWORD)track[n+5]));
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n+=6;
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}
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else if (track[n+1]==0x2F && track[n+2]==0x00)
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{
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if (ff_num>max_ff_num)
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{
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max_ff_num=ff_num;
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max_ff_track=cur_track_start;
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}
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return _res;
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}
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else
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{
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DWORD _l=0,l1;
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UINT n1=0;
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{
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do
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{
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_l=(_l<<7)|(track[n+2+n1++]&0x7F);
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}
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while((n+1+n1< size) && track[n+1+n1]&0x80);
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}
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if (_l>255) l1=255;
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else l1=_l;
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if (track[n+1]<0x10) ff_num++;
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switch(track[n+1])
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{
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case 6:
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// if (!cpr || *cpr) break;
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case 2:
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if (n + 1 + n1 + l1 >= size)
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return -1;
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mf->info.copyright.add_string_n((char*)(track+n+n1+2),l1);
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mf->info.copyright.add_string("\x0d\x0a");
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break;
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case 5:
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is_blah=1;
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break;
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case 3:
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case 1:
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if (is_kar((char*)track+n+n1+2,_l)) is_blah=1;
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case 4:
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if (name.length()==0)
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{
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name.add_string_n((char*)(track+n+n1+2),l1);
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}
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break;
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}
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size_t n_increment;
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if (SizeTAdd(2, n1, &n_increment) != S_OK || SizeTAdd(n_increment, _l, &n_increment) != S_OK || SizeTAdd(n_increment, n, &n) != S_OK)
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return -1;
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}
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}
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else if ((track[n]&0xF0)==0xF0)
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{
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if (track[n]==0xF0)
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{
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_res=res;
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UINT s=ReadSysex(&track[n],size-n);
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smap->AddEvent(&track[n],s,cpos+res);
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n+=s;
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if (s_track==-1) s_track=c_track;
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else if (s_track!=c_track) s_track=-2;
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}
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else //hack...
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if (track[n]==0xF7) n++;
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else
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{
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#ifdef BLAH
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char tmp[32] = {0};
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wsprintf(tmp,"invalid Fx event at %x",n);
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MessageBox(0,tmp,0,0);
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#endif
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return -1;
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}
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}
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else
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{
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lc1=track[n];
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// if (lc1 == 0) return -1;
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if ((lc1&0x80)==0)
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{
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if (lastcom==0)
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return -1;
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run=1;
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lc1=lastcom;
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n--;
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} else run=0;
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_res=res;
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switch(lc1&0xF0)
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{
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case 0x80:
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case 0x90:
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if (!(got_notes&(1<<(lc1&0xF))))
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{
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nch++;
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got_notes|=1<<(lc1&0xF);
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}
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case 0xB0:
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if (track[n+1]==cfg_loop_ctrl && loop==-1)
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loop=res;
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case 0xA0:
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case 0xE0:
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n+=3;
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lastcom=lc1;
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break;
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case 0xC0:
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case 0xD0:
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n+=2;
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lastcom=lc1;
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break;
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default:
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return -1;
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}
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}
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}
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return _res;
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}
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bool GetMidiInfo(MIDI_file* mf)
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{
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CGetInfo i;
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return i.Run(mf);
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}
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bool CGetInfo::Run(MIDI_file* _mf)
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{
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mf=_mf;
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nch=0;
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s_track=-1;
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is_blah=0;
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max_ff_track=max_ff_num=0;
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MIDIHEADER hd = *(MIDIHEADER*)(mf->data+8);
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tmap=tmap_create();
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if (!tmap) return 0;
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smap=smap_create();
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ttmap=0;
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mf->tmap=tmap;//avoid stupid memleaks
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mf->smap=smap;
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loop=-1;
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tmap->AddEntry(0,500000);
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DWORD sz = mf->size-14;
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FixHeader(hd);
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got_notes=0;
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nch=0;
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const BYTE* trax=mf->data+14;
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const BYTE* ntrak=trax;
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if (hd.trax>0x100 || hd.fmt>2) return 0;
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f2=hd.fmt==2;
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int n,tmp;
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int size=0;
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mf->info.traxnames = new string[hd.trax];
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for(c_track=0;c_track<hd.trax;c_track++)
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{
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if (!ttmap) ttmap=tmap_create();
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if ((UINT)(ntrak-trax)>=(UINT)sz || *((DWORD*)ntrak)!='krTM' || (tmp=rev32(*((DWORD*)ntrak+1)))+ntrak>sz+trax) return 0;
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cur_track_start=ntrak-mf->data;
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tmp=DoTrack(ntrak+8,tmp,mf->info.traxnames[c_track],f2 ? size : 0);
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if (tmp==-1)
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{
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/* ntrak[8]=0;
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ntrak[9]=0xFF;
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ntrak[10]=0x2F;
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ntrak[11]=0;*/
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#ifdef BLAH
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{
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char e[128] = {0};
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wsprintf(e,"Bad track #%u",c_track);
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MessageBox(0,e,ERROR,0);
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}
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#endif
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}
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else
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{
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if (f2) size+=tmp;
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else if (tmp>size) size=tmp;
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if (ttmap->pos)
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{
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mf->tmap=tmap=tmap_merge(tmap,ttmap);
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ttmap=0;
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}
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}
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ntrak+=rev32(*((DWORD*)ntrak+1))+8;
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}
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if (ttmap) delete ttmap;
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if (!tmap) return 0;
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mf->tix=MulDiv(size+50,768,hd.dtx);
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DWORDLONG res=0;
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for(n=0;n<tmap->pos-1 && tmap->data[n].pos<size;n++)
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{
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res+=UInt32x32To64(tmap->data[n].tm,tmap->data[n+1].pos-tmap->data[n].pos);
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}
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if (tmap->data[n].pos<size) res+=UInt32x32To64(tmap->data[n].tm,size-tmap->data[n].pos);
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mf->len=(DWORD)(res/(hd.dtx*1000));
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if (loop!=-1 && loop<size)
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{
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mf->loopstart=loop;
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}
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mf->info.channels=nch;
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mf->info.fmt=hd.fmt;
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mf->info.ntrax=hd.trax;
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mf->info.tix=size;
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if (mf->loopstart)
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{
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mf->loopstart_t=mf->loopstart;
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mf->loopstart=MulDiv(mf->loopstart,768,hd.dtx);
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mf->loopend=MulDiv(size+15,768,hd.dtx);
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}
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else mf->loopstart_t=-1;
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if (!f2 && smap && s_track==-2) smap->CleanUp(); //todo: optimize this shit...
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/* mf->tmap=tmap;
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mf->smap=smap;*/
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mf->info.e_type=smap->GetType();
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if (is_blah)
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{
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mf->kar_track=max_ff_track;
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}
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return 1;
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}
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