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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 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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