diff options
Diffstat (limited to 'qmpmidiread.cpp')
| -rw-r--r-- | qmpmidiread.cpp | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/qmpmidiread.cpp b/qmpmidiread.cpp new file mode 100644 index 0000000..dff91a1 --- /dev/null +++ b/qmpmidiread.cpp @@ -0,0 +1,217 @@ +//CLI Midi file player based on libfluidsynth +//Midi file reading module +//Written by Chris Xiong, 2015 +#include <cstdio> +#include <cstring> +#include <cstdlib> +#include <cstdint> +#include <cstdarg> +#include <algorithm> +#include "qmpmidiplay.hpp" +bool cmp(SEvent *a,SEvent *b){return a->time-b->time?a->time<b->time:a->iid<b->iid;} +void CMidiFile::error(int fatal,const char* format,...) +{ + va_list ap; + va_start(ap,format);vfprintf(stderr,format,ap);va_end(ap); + fprintf(stderr," at %#lx\n",ftell(f)); + if(fatal)exit(2); +} +uint32_t CMidiFile::readSW() +{ + byteread+=2; + uint32_t ret=0; + for(int i=0;i<2;++i){ret<<=8;ret|=((uint32_t)fgetc(f))&0xFF;} + return ret; +} +uint32_t CMidiFile::readDW() +{ + byteread+=4; + uint32_t ret=0; + for(int i=0;i<4;++i){ret<<=8;ret|=((uint32_t)fgetc(f))&0xFF;} + return ret; +} +uint32_t CMidiFile::readVL() +{ + uint32_t ret=0,t,c=0; + do + { + t=fgetc(f); + if(++c>4)error(1,"E: Variable length type overflow."); + ret<<=7;ret|=(t&0x7F); + }while(t&0x80); + byteread+=c; + return ret; +} +int CMidiFile::eventReader()//returns 0 if End of Track encountered +{ + uint32_t delta=readVL();curt+=delta; + //printf("event@%#lx, delta %u: ",ftell(f),delta); + char type=fgetc(f);++byteread;uint32_t p1,p2; + static char lasttype; +retry: + switch(type&0xF0) + { + case 0x80://Note Off + p1=fgetc(f);p2=fgetc(f);byteread+=2; + eventList[eventc++]=new SEvent(curid,curt,type,p1,p2); + //printf("Note off at ch#%d, note #%d, vel %d.\n",ch,p1,p2); + break; + case 0x90://Note On + p1=fgetc(f);p2=fgetc(f);byteread+=2; + if(p2) + { + ++notes; + eventList[eventc++]=new SEvent(curid,curt,type,p1,p2); + } + else + eventList[eventc++]=new SEvent(curid,curt,(type&0x0F)|0x80,p1,p2); + //printf("Note on at ch#%d, note #%d, vel %d.\n",ch,p1,p2); + break; + case 0xA0://Note Aftertouch + p1=fgetc(f);p2=fgetc(f);byteread+=2; + eventList[eventc++]=new SEvent(curid,curt,type,p1,p2); + //printf("Note aftertouch at ch#%d, note #%d, vel %d.\n",ch,p1,p2); + break; + case 0xB0://Controller Change + p1=fgetc(f);p2=fgetc(f);byteread+=2; + eventList[eventc++]=new SEvent(curid,curt,type,p1,p2); + //printf("Controller change at ch#%d, cc #%d, val %d.\n",ch,p1,p2); + break; + case 0xC0://Patch Change + p1=fgetc(f);++byteread; + eventList[eventc++]=new SEvent(curid,curt,type,p1,0); + //printf("Patch change at ch#%d, pc #%d.\n",ch,p1); + break; + case 0xD0://Channel Aftertouch + p1=fgetc(f);++byteread; + eventList[eventc++]=new SEvent(curid,curt,type,p1,0); + //printf("Channel aftertouch at ch#%d, vel #%d.\n",ch,p1); + break; + case 0xE0://Pitch wheel + p1=fgetc(f);p2=fgetc(f);byteread+=2; + eventList[eventc++]=new SEvent(curid,curt,type,(p1|(p2<<7))&0x3FFF,0); + //printf("Pitch wheel at ch#%d, val %u.\n",type&0x0F,(p1|(p2<<7))&0x3FFF); + break; + case 0xF0: + if((type&0x0F)==0x0F)//Meta Event + { + char metatype=fgetc(f);++byteread; + switch(metatype) + { + case 0x00://Sequence Number + fgetc(f);fgetc(f);fgetc(f); + byteread+=3; + //printf("seqence number.\n"); + break; + case 0x20://Channel Prefix + fgetc(f);fgetc(f);byteread+=2; + //printf("channel prefix.\n"); + break; + case 0x2F://End of Track + fgetc(f);++byteread; + //printf("end of track.\n"); + return 0; + break; + case 0x51://Set Tempo + //fgetc(f);fgetc(f);fgetc(f);fgetc(f); + p1=readDW();p1&=0x00FFFFFF; + eventList[eventc++]=new SEvent(curid,curt,type,metatype,p1); + //byteread+=4; + break; + case 0x54://SMTPE offset, not handled. + fgetc(f);fgetc(f);fgetc(f); + fgetc(f);fgetc(f);fgetc(f); + byteread+=6; + break; + case 0x58://Time signature + fgetc(f);++byteread; + p1=readDW(); + eventList[eventc++]=new SEvent(curid,curt,type,metatype,p1); + break; + case 0x59://Key signature + fgetc(f);++byteread; + p1=readSW(); + eventList[eventc++]=new SEvent(curid,curt,type,metatype,p1); + break; + case 0x01:case 0x02:case 0x03: + case 0x04:case 0x05:case 0x06: + case 0x07:case 0x7F:default://text-like meta + { + uint32_t len=readVL(),c;char* str=NULL; + if(len<=1024&&len>0)str=new char[len+8]; + for(c=0;c<len;++c) + { + ++byteread;if(str)str[c]=fgetc(f);else fgetc(f); + } + eventList[eventc++]=new SEvent(curid,curt,type,metatype,0,str); + if(len<=1024&&len>0)delete[] str; + } + } + } + else if((type&0x0F)==0x00||(type&0x0F)==0x07)//SysEx + { + uint32_t len=readVL(); + while(len--){++byteread;fgetc(f);} + } + else error(0,"W: Unknown event type %#x",type); + break; + default: + fseek(f,-1,SEEK_CUR);--byteread;type=lasttype;goto retry; + } + lasttype=type;++curid; + return 1; +} +void CMidiFile::trackChunkReader() +{ + int chnklen=readDW();byteread=0;curt=0;curid=0; + while(/*byteread<chnklen&&*/eventReader()); + if(byteread<chnklen) + { + error(0,"W: Extra bytes after EOT event."); + while(byteread<chnklen){fgetc(f);++byteread;} + } + /*if(byteread>chnklen) + { + error(1,"E: Read past end of track."); + }*/ +} +void CMidiFile::headerChunkReader() +{ + int chnklen=readDW();byteread=0; + if(chnklen<6)error(1,"E: Header chunk too short."); + if(chnklen>6)error(0,"W: Header chunk length longer than expected. Ignoring extra bytes."); + fmt=readSW();trk=readSW();divs=readSW(); + if(divs&0x8000)error(1,"E: SMTPE format is not supported."); + for(;byteread<chnklen;++byteread){fgetc(f);} +} +void CMidiFile::chunkReader(int hdrXp) +{ + char hdr[6]; + if(!fgets(hdr,5,f))error(1,"E: Unexpected EOF."); + if(hdrXp) + if(strncmp(hdr,"MThd",4))error(1,"E: Wrong MIDI header."); + else headerChunkReader(); + else + if(strncmp(hdr,"MTrk",4)) + { + error(0,"W: Wrong track chunk header. Ignoring the whole chunk."); + for(int chnklen=readDW();chnklen>0;--chnklen)fgetc(f); + } + else trackChunkReader(); +} +CMidiFile::CMidiFile(const char* fn) +{ + if(!(f=fopen(fn,"rb")))exit((printf("E: file %s doesn't exist!\n",fn),2)); + chunkReader(1); + for(uint32_t i=0;i<trk;++i)chunkReader(0); + printf("%d note(s)\n",notes); + fclose(f); + std::sort(eventList,eventList+eventc,cmp); +} +CMidiFile::~CMidiFile() +{ + for(uint32_t i=0;i<eventc;++i)delete eventList[i]; +} +const SEvent* CMidiFile::getEvent(uint32_t id){return id<eventc?eventList[id]:NULL;} +uint32_t CMidiFile::getEventCount(){return eventc;} +uint32_t CMidiFile::getDivision(){return divs;} |