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|
//=========================================================
// MusE
// Linux Music Editor
// $Id: grepmidi.cpp,v 1.1.1.1 2003/10/27 18:57:02 wschweer Exp $
//
// (C) Copyright 1999/2000 Werner Schweer (ws@seh.de)
//=========================================================
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#define XCHG_SHORT(x) ((((x)&0xFF)<<8) | (((x)>>8)&0xFF))
#ifdef __i486__
#define XCHG_LONG(x) \
({ int __value; \
asm ("bswap %1; movl %1,%0" : "=g" (__value) : "r" (x)); \
__value; })
#else
#define XCHG_LONG(x) ((((x)&0xFF)<<24) | \
(((x)&0xFF00)<<8) | \
(((x)&0xFF0000)>>8) | \
(((x)>>24)&0xFF))
#endif
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define BE_SHORT(x) XCHG_SHORT(x)
#define BE_LONG(x) XCHG_LONG(x)
#else
#define BE_SHORT(x) x
#define BE_LONG(x) x
#endif
int cpos;
bool printName = false;
const char* curName;
//---------------------------------------------------------
// readLong
//---------------------------------------------------------
int readLong(FILE* f)
{
int format;
if (fread(&format, 4, 1, f) != 1) {
printf("read long failed\n");
exit(1);
}
cpos += 4;
return BE_LONG(format);
}
//---------------------------------------------------------
// readShort
//---------------------------------------------------------
int readShort(FILE* f)
{
short format;
if (fread(&format, 2, 1, f) != 1) {
printf("read short failed\n");
exit(1);
}
cpos += 2;
return BE_SHORT(format);
}
/*---------------------------------------------------------
* getvl
* Read variable-length number (7 bits per byte, MSB first)
*---------------------------------------------------------*/
int getvl(FILE* f)
{
int l = 0;
for (int i = 0;i < 8; i++) {
int c = getc(f);
++cpos;
if (c == EOF)
break;
c &= 0xff;
l += (c & 0x7f);
if (!(c & 0x80))
return l;
l <<= 7;
}
printf("Variable Len too long\n");
return -1;
}
//---------------------------------------------------------
// skip
//---------------------------------------------------------
void skip(FILE* f, int n)
{
while (n--) {
++cpos;
if (getc(f) == EOF) {
printf("skip %d failed\n", n);
exit(1);
}
}
}
//---------------------------------------------------------
// grepTrack
//---------------------------------------------------------
int grepTrack(FILE* f, int trackno)
{
// printf("TRACK %d\n", trackno);
int mtype, mlen;
int b;
char* buffer;
char tmp[4];
fread(tmp, 4, 1, f);
if (memcmp(tmp, "MTrk", 4))
return -5;
int len = readLong(f);
int endpos = cpos + len;
int runstate = -1;
for (;;) {
/* int nclick = */ getvl(f);
int me = getc(f);
++cpos;
int a = -1;
if ((me & 0x80) == 0) {
if (runstate == -1)
return -6;
a = me;
me = runstate;
}
switch (me & 0xf0) {
case 0x80:
case 0x90:
case 0xa0:
case 0xb0:
case 0xe0:
b = getc(f);
++cpos;
case 0xc0:
case 0xd0:
if (a == -1) {
a = getc(f);
++cpos;
}
runstate = me;
break;
case 0xf0:
switch(me & 0xf) {
case 0: // SYSEX
mlen = getvl(f);
skip(f, mlen);
break;
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
if (printName)
printf("%s: ", curName);
printf("unknown Message\n");
break;
case 7: // EOX
case 8: // timing clock
case 9: // undefined
case 0xa: // start
case 0xb: // continue
case 0xc: // stop
case 0xd: // undefined
case 0xe: // active sensing
if (printName)
printf("%s: ", curName);
printf("RT Message??\n");
break;
case 0xf: // META
mtype = getc(f);
++cpos;
mlen = getvl(f);
buffer = new char[mlen+1];
if (mlen) {
if (fread(buffer, mlen, 1, f) != 1) {
if (printName)
printf("%s: ", curName);
printf("---meta %d too short (%d)\n", mtype, mlen);
exit(1);
}
cpos += mlen;
}
switch(mtype) {
case 0x2f:
delete buffer;
goto end;
case 1:
case 2:
case 3:
case 4:
case 5:
case 6: // Marker
case 7:
case 8:
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15:
buffer[mlen] = 0;
if (printName)
printf("%s: ", curName);
printf("%02d Meta %0d: <%s>\n", trackno, mtype, buffer);
default:
break;
}
delete buffer;
break;
}
break;
}
}
end:
if (cpos != endpos) {
if (printName)
printf("%s: ", curName);
printf(" %d zu kurz\n", cpos - endpos);
}
if (endpos-cpos > 0)
skip(f, endpos-cpos);
return 0;
}
//---------------------------------------------------------
// grep
//---------------------------------------------------------
int grep(FILE* f)
{
char tmp[4];
fread(tmp, 4, 1, f);
if (memcmp(tmp, "MThd", 4) != 0)
return -2;
int len = readLong(f);
if (len < 6)
return -3;
cpos += 8;
int format = readShort(f);
int ntracks = readShort(f);
readShort(f); // division
if (len > 6)
skip(f, len-6); /* skip the excess */
int rv = 0;
switch (format) {
case 0: rv = grepTrack(f, 0); break;
case 1:
for (int i = 0; i < ntracks; i++) {
rv = grepTrack(f, i);
if (rv != 0)
return rv;
}
break;
default:
return -4;
}
return 0;
}
//---------------------------------------------------------
// grep
//---------------------------------------------------------
int grepMidi(const char* name)
{
curName = name;
char*p = strrchr(name, '.');
FILE* f;
if (p && strcmp(p, ".gz") == 0) {
char buffer[512];
sprintf(buffer, "gunzip < %s", name);
f = popen(buffer, "r");
}
else {
p = 0;
f = fopen(name, "r");
}
if (f == 0)
return -1;
cpos = 0;
int rc = grep(f);
if (p)
pclose(f);
else
fclose(f);
return rc;
}
//---------------------------------------------------------
// usage
//---------------------------------------------------------
void usage(const char* fname, const char* txt)
{
fprintf(stderr, "%s: %s\n", fname, txt);
// fprintf(stderr, "usage:\n");
}
//---------------------------------------------------------
// main
//---------------------------------------------------------
int main(int argc, char* argv[])
{
int c;
while ((c = getopt(argc, argv, "f")) != EOF) {
switch (c) {
case 'f': printName = true; break;
default: usage(argv[0], "bad argument"); return -1;
}
}
argc -= optind;
++argc;
char* p = 0;
for (int i = 1; i < argc; ++i) {
switch (grepMidi(argv[i])) {
case 0: break;
case -1: p = "not found"; break;
case -2: p = "no 'MThd': not a midi file"; break;
case -3: p = "file too short"; break;
case -4: p = "bad file type"; break;
case -5: p = "no 'MTrk': not a midi file"; break;
case -6: p = "no running state"; break;
default:
printf("was??\n");
return -1;
}
}
if (p)
printf("Error: <%s>\n", p);
return 0;
}
|
