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//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"
const char* GM1SysX={"\xF0\x7E\x7F\x09\x01\xF7"};
const char* GM2SysX={"\xF0\x7E\x7F\x09\x03\xF7"};
const char* GSSysEx={"\xF0\x41\x10\x42\x12\x40\x00\x7F\x00\x41\xF7"};
const char* XGSysEx={"\xF0\x43\x10\x4C\x00\x00\x7E\x00\xF7"};
bool cmp(SEvent a,SEvent b){return a.time-b.time?a.time<b.time:a.iid<b.iid;}
void CSMFReader::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)throw std::runtime_error("fatal error");
}
uint32_t CSMFReader::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 CSMFReader::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 CSMFReader::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 CSMFReader::eventReader()//returns 0 if End of Track encountered
{
uint32_t delta=readVL();curt+=delta;
char type=fgetc(f);++byteread;uint32_t p1,p2;
static char lasttype;eventdiscarded=0;
if(!(type&0x80)){fseek(f,-1,SEEK_CUR);--byteread;type=lasttype;}
switch(type&0xF0)
{
case 0x80://Note Off
p1=fgetc(f);p2=fgetc(f);byteread+=2;
ret->eventList.push_back(SEvent(curid,curt,type,p1,p2));
break;
case 0x90://Note On
p1=fgetc(f);p2=fgetc(f);byteread+=2;
if(p2)
ret->eventList.push_back(SEvent(curid,curt,type,p1,p2));
else
ret->eventList.push_back(SEvent(curid,curt,(type&0x0F)|0x80,p1,p2));
break;
case 0xA0://Note Aftertouch
p1=fgetc(f);p2=fgetc(f);byteread+=2;
ret->eventList.push_back(SEvent(curid,curt,type,p1,p2));
break;
case 0xB0://Controller Change
p1=fgetc(f);p2=fgetc(f);byteread+=2;
ret->eventList.push_back(SEvent(curid,curt,type,p1,p2));
break;
case 0xC0://Patch Change
p1=fgetc(f);++byteread;
ret->eventList.push_back(SEvent(curid,curt,type,p1,0));
break;
case 0xD0://Channel Aftertouch
p1=fgetc(f);++byteread;
ret->eventList.push_back(SEvent(curid,curt,type,p1,0));
break;
case 0xE0://Pitch wheel
p1=fgetc(f);p2=fgetc(f);byteread+=2;
ret->eventList.push_back(SEvent(curid,curt,type,(p1|(p2<<7))&0x3FFF,0));
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;
break;
case 0x20://Channel Prefix
fgetc(f);fgetc(f);byteread+=2;
break;
case 0x2F://End of Track
fgetc(f);++byteread;
return 0;
break;
case 0x51://Set Tempo
p1=readDW();p1&=0x00FFFFFF;
ret->eventList.push_back(SEvent(curid,curt,type,metatype,p1));
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();
ret->eventList.push_back(SEvent(curid,curt,type,metatype,p1));
break;
case 0x59://Key signature
fgetc(f);++byteread;
p1=readSW();
ret->eventList.push_back(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);
}
if(str)str[c]='\0';ret->eventList.push_back(SEvent(curid,curt,type,metatype,0,str));
if(str&&metatype==0x03&&!ret->title)
{
ret->title=new char[len+8];
strcpy(ret->title,str);
}
if(str&&metatype==0x02&&!ret->copyright)
{
ret->copyright=new char[len+8];
strcpy(ret->copyright,str);
}
if(len<=1024&&len>0)delete[] str;
}
}
}
else if((type&0x0F)==0x00||(type&0x0F)==0x07)//SysEx
{
uint32_t len=readVL(),c;char* str=NULL;
str=new char[len+8];
if((type&0x0F)==0x00)
{
str[0]=0xF0;++len;
for(c=1;c<len;++c){++byteread;str[c]=fgetc(f);}
}
else for(c=0;c<len;++c){++byteread;str[c]=fgetc(f);}
ret->eventList.push_back(SEvent(curid,curt,type,len,0,str));
if(!strcmp(str,GM1SysX))ret->std=1;
if(!strcmp(str,GM2SysX))ret->std=2;
if(!strcmp(str,GSSysEx))ret->std=3;
if(!strcmp(str,XGSysEx))ret->std=4;
delete[] str;
}
else error(0,"W: Unknown event type %#x",type);
break;
default:
error(0,"W: Unknown event type %#x",type);
}
lasttype=type;++curid;
if(ret->eventList.size())
{
SEvent& le=ret->eventList[ret->eventList.size()-1];
SEventCallBackData cbd(le.type,le.p1,le.p2,le.time);
CMidiPlayer::getInstance()->callEventReaderCB(cbd);
}
return 1;
}
void CSMFReader::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 CSMFReader::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();ret->divs=readSW();
if(ret->divs&0x8000)error(1,"E: SMTPE format is not supported.");
for(;byteread<chnklen;++byteread){fgetc(f);}
}
int CSMFReader::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.");throw std::runtime_error("Wrong MIDI header");}
else return headerChunkReader(),0;
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);return 0;
}
else return trackChunkReader(),1;
}
CSMFReader::CSMFReader()
{
f=NULL;
}
CMidiFile* CSMFReader::readFile(const char* fn)
{
ret=new CMidiFile;
ret->title=ret->copyright=NULL;ret->std=0;ret->valid=1;
try
{
if(!(f=fopen(fn,"rb")))throw (fprintf(stderr,"E: file %s doesn't exist!\n",fn),std::runtime_error("File doesn't exist"));
chunkReader(1);
for(uint32_t i=0;i<trk;i+=chunkReader(0));
fclose(f);f=NULL;
std::sort(ret->eventList.begin(),ret->eventList.end(),cmp);
}
catch(std::runtime_error&){fprintf(stderr,"E: %s is not a supported file.\n",fn);ret->valid=0;fclose(f);f=NULL;}
return ret;
}
CSMFReader::~CSMFReader()
{
}
void CSMFReader::discardCurrentEvent()
{
if(eventdiscarded)return;eventdiscarded=1;
ret->eventList.pop_back();
}
void CSMFReader::commitEventChange(SEventCallBackData d)
{
ret->eventList[ret->eventList.size()-1].time=d.time;
ret->eventList[ret->eventList.size()-1].type=d.type;
ret->eventList[ret->eventList.size()-1].p1=d.p1;
ret->eventList[ret->eventList.size()-1].p2=d.p2;
}
void CMidiFileReaderCollection::destructFile(CMidiFile*& f)
{
if(!f)return;
if(f->copyright)delete[] f->copyright;
if(f->title)delete[] f->title;
delete f;
f=NULL;
}
CMidiFileReaderCollection::CMidiFileReaderCollection()
{
file=NULL;readers.clear();currentReader=NULL;
registerReader(new CSMFReader(),"Default SMF Reader");
}
CMidiFileReaderCollection::~CMidiFileReaderCollection()
{
if(file)destructFile(file);
delete readers[0].first;
}
void CMidiFileReaderCollection::registerReader(IMidiFileReader* reader,std::string name)
{
for(unsigned i=0;i<readers.size();++i)
if(readers[i].second==name)return;
readers.push_back(std::make_pair(reader,name));
}
void CMidiFileReaderCollection::unregisterReader(std::string name)
{
for(auto i=readers.begin();i!=readers.end();++i)
if(i->second==name)
{
readers.erase(i);
return;
}
}
void CMidiFileReaderCollection::readFile(const char* fn)
{
if(file)destructFile(file);
for(unsigned i=0;i<readers.size();++i)
{
currentReader=readers[i].first;
CMidiFile* t=readers[i].first->readFile(fn);
if(t->valid){file=t;break;}
else destructFile(t);
}
currentReader=NULL;
if(file)
maxtk=file->eventList[file->eventList.size()-1].time;
}
void CMidiFileReaderCollection::destructFile()
{destructFile(file);}
IMidiFileReader* CMidiFileReaderCollection::getCurrentReader()
{return currentReader;}
bool CMidiFileReaderCollection::isValid()
{return file&&file->valid;}
const char* CMidiFileReaderCollection::getTitle()
{return file?file->title:NULL;}
const char* CMidiFileReaderCollection::getCopyright()
{return file?file->copyright:NULL;}
const SEvent* CMidiFileReaderCollection::getEvent(uint32_t id)
{return file?&(file->eventList[id]):NULL;}
uint32_t CMidiFileReaderCollection::getEventCount()
{return file?file->eventList.size():0;}
uint32_t CMidiFileReaderCollection::getDivision()
{return file?file->divs:0;}
uint32_t CMidiFileReaderCollection::getMaxTick()
{return maxtk;}
uint32_t CMidiFileReaderCollection::getStandard()
{return file?file->std:0;}
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