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-rw-r--r--muse2/grepmidi/grepmidi.cpp348
1 files changed, 348 insertions, 0 deletions
diff --git a/muse2/grepmidi/grepmidi.cpp b/muse2/grepmidi/grepmidi.cpp
new file mode 100644
index 00000000..1d33b4ac
--- /dev/null
+++ b/muse2/grepmidi/grepmidi.cpp
@@ -0,0 +1,348 @@
+//=========================================================
+// MusE
+// Linux Music Editor
+// $Id: grepmidi.cpp,v 1.1.1.1.2.1 2009/03/09 02:05:17 terminator356 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;
+ const 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;
+ const 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;
+ }
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