From 70fd2d85c1bd6fb8732e680e8fda9d36c317c732 Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Wed, 6 Apr 2016 16:54:29 +0800
Subject: Too young too simple.

---
 qmidiplayer-lite/qmpmidiread.cpp | 240 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 240 insertions(+)
 create mode 100644 qmidiplayer-lite/qmpmidiread.cpp

(limited to 'qmidiplayer-lite/qmpmidiread.cpp')

diff --git a/qmidiplayer-lite/qmpmidiread.cpp b/qmidiplayer-lite/qmpmidiread.cpp
new file mode 100644
index 0000000..0bcf597
--- /dev/null
+++ b/qmidiplayer-lite/qmpmidiread.cpp
@@ -0,0 +1,240 @@
+//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 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)throw 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;
+	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);
+		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);
+		break;
+		case 0xA0://Note Aftertouch
+			p1=fgetc(f);p2=fgetc(f);byteread+=2;
+			eventList[eventc++]=new SEvent(curid,curt,type,p1,p2);
+		break;
+		case 0xB0://Controller Change
+			p1=fgetc(f);p2=fgetc(f);byteread+=2;
+			eventList[eventc++]=new SEvent(curid,curt,type,p1,p2);
+		break;
+		case 0xC0://Patch Change
+			p1=fgetc(f);++byteread;
+			eventList[eventc++]=new SEvent(curid,curt,type,p1,0);
+		break;
+		case 0xD0://Channel Aftertouch
+			p1=fgetc(f);++byteread;
+			eventList[eventc++]=new SEvent(curid,curt,type,p1,0);
+		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);
+		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;
+						eventList[eventc++]=new 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();
+						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);
+						}
+						if(str)str[c]='\0';eventList[eventc++]=new SEvent(curid,curt,type,metatype,0,str);
+						if(str&&metatype==0x03&&!title)
+						{
+							title=new char[len+8];
+							strcpy(title,str);
+						}
+						if(str&&metatype==0x02&&!copyright)
+						{
+							copyright=new char[len+8];
+							strcpy(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);}
+				eventList[eventc++]=new SEvent(curid,curt,type,len,0,str);
+				if(!strcmp(str,GM1SysX))std=1;
+				if(!strcmp(str,GM2SysX))std=2;
+				if(!strcmp(str,GSSysEx))std=3;
+				if(!strcmp(str,XGSysEx))std=4;
+			}
+			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);}
+}
+int 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.");throw;}
+		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;
+}
+CMidiFile::CMidiFile(const char* fn)
+{
+	title=copyright=NULL;notes=eventc=0;std=0;valid=1;
+	try
+	{
+		if(!(f=fopen(fn,"rb")))throw (fprintf(stderr,"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);
+	}
+	catch(int){fprintf(stderr,"E: %s is not a supported file.\n",fn);valid=0;}
+}
+CMidiFile::~CMidiFile()
+{
+	for(uint32_t i=0;i<eventc;++i)delete eventList[i];
+	if(title)delete[] title;if(copyright)delete[] copyright;
+}
+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;}
+uint32_t CMidiFile::getNoteCount(){return notes;}
+uint32_t CMidiFile::getStandard(){return std;}
+bool CMidiFile::isValid(){return valid;}
+const char* CMidiFile::getTitle(){return title;}
+const char* CMidiFile::getCopyright(){return copyright;}
-- 
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