summaryrefslogtreecommitdiffstats
path: root/libkmid/midfile.cc
blob: baf0a2b37c86ffbaed8b804ecfba04ca68ff784f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
/**************************************************************************

    midfile.cc - function which reads a midi file,and creates the track classes
    This file is part of LibKMid 0.9.5
    Copyright (C) 1997,98,99,2000  Antonio Larrosa Jimenez
    LibKMid's homepage : http://www.arrakis.es/~rlarrosa/libkmid.html

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.

    Send comments and bug fixes to Antonio Larrosa <larrosa@kde.org>

***************************************************************************/
#include "midfile.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "sndcard.h"
#include "midispec.h"
#include "mt32togm.h"
#include "sys/stat.h"
#include <config.h>

#include <kprocess.h>
#include <qfile.h>

int fsearch(FILE *fh,const char *text,long *ptr);

/* This function gives the metronome tempo, from a tempo data as found in
   a midi file */
double tempoToMetronomeTempo(ulong x)
{
  return 60/((double)x/1000000);
}

double metronomeTempoToTempo(ulong x)
{
  return ((double)60*x)/1000000;
}

int uncompressFile(const char *gzname, char *tmpname)
  // Returns 0 if OK, 1 if error (tmpname not set)
{
  QString cmd("gzip -dc " + KProcess::quote(gzname));
  FILE *infile = popen( QFile::encodeName(cmd).data(), "r");
  if (infile==NULL) {
    fprintf(stderr,"ERROR : popen failed : %s\n",QFile::encodeName(cmd).data());
    return 1;
  }
  strcpy(tmpname, "/tmp/KMid.XXXXXXXXXX");
  int fd = mkstemp(tmpname);
  if (fd == -1)
  {
    pclose(infile);
    return 1;
  }
  FILE *outfile= fdopen(fd,"wb");
  if (outfile==NULL)
  {
    pclose(infile);
    return 1;
  }
  int n=getc(infile);
  if (n==EOF) 
  {
    pclose(infile);
    fclose(outfile);
    unlink(tmpname);
    return 1;
  }
  fputc(n,outfile);
  int buf[BUFSIZ];
  n = fread(buf, 1, BUFSIZ, infile);
  while (n>0)
  {
    fwrite(buf, 1, n, outfile);
    n = fread(buf, 1, BUFSIZ, infile);
  }

  pclose(infile);

  //if (pclose(infile) != 0) fprintf(stderr,"Error : pclose failed\n");
  // Is it right for pclose to always fail ?

  fclose(outfile);
  return 0;
}

MidiTrack **readMidiFile( const char *name, MidiFileInfo *info, int &ok)
{
  ok=1;
  MidiTrack **tracks;

  struct stat buf;
  if (stat(name,&buf) || !S_ISREG(buf.st_mode))
  {
    fprintf(stderr,"ERROR: %s is not a regular file\n",name);
    ok=-6;
    return NULL;
  }

  FILE *fh=fopen(name,"rb");
  if (fh==NULL) 
  {
    fprintf(stderr,"ERROR: Can't open file %s\n",name);
    ok=-1;
    return NULL;
  }
  char text[4];
  text[0] = 0;
  fread(text,1,4,fh);
  if ((strncmp(text,"MThd",4)!=0)&&(strcmp(&name[strlen(name)-3],".gz")==0))
  {	
    fclose(fh);
    char tempname[200];
    fprintf(stderr,"Trying to open zipped midi file...\n");
    if (uncompressFile(name,tempname)!=0)
    {
      fprintf(stderr,"ERROR: %s is not a (zipped) midi file\n",name);
      ok=-2;
      return NULL;
    }
    fh=fopen(tempname,"rb");
    fread(text,1,4,fh);
    unlink(tempname);
  }

  if (strncmp(text,"MThd",4)!=0)
  {
    fseek(fh,0,SEEK_SET);
    long pos;
    if (fsearch(fh,"MThd",&pos)==0)
    {	
      fclose(fh);
      fprintf(stderr,"ERROR: %s is not a midi file.\n",name);
      ok=-2;
      return NULL;
    }
    fseek(fh,pos,SEEK_SET);
    fread(text,1,4,fh);
  }
  long header_size=readLong(fh);
  info->format=readShort(fh);
  info->ntracks=readShort(fh);
  info->ticksPerCuarterNote=readShort(fh);
  if (info->ticksPerCuarterNote<0)
  {
    fprintf(stderr,"ERROR: Ticks per cuarter note is negative !\n");
    fprintf(stderr,"Please report this error to : larrosa@kde.org\n");
    fclose(fh);
    ok=-3;
    return NULL;
  }
  if (header_size>6) fseek(fh,header_size-6,SEEK_CUR);
  tracks=new MidiTrack*[info->ntracks];
  if (tracks==NULL)
  {
    fprintf(stderr,"ERROR: Not enough memory\n");
    fclose(fh);
    ok=-4;
    return NULL;
  }
  int i=0;
  while (i<info->ntracks)
  {
    fread(text,1,4,fh);
    if (strncmp(text,"MTrk",4)!=0)
    {
      fprintf(stderr,"ERROR: Not a well built midi file\n");
      fprintf(stderr,"%s",text);
      fclose(fh);
      ok=-5;
      return NULL;
    }
    tracks[i]=new MidiTrack(fh,info->ticksPerCuarterNote,i);
    if (tracks[i]==NULL)
    {
      fprintf(stderr,"ERROR: Not enough memory");
      fclose(fh);
      ok=-4;
      return NULL;
    }
    i++;
  }

  fclose(fh);

  return tracks;

}

void parseInfoData(MidiFileInfo *info,MidiTrack **tracks,float ratioTempo)
{

  info->ticksTotal=0;
  info->millisecsTotal=0.0;
  info->ticksPlayed=0;
  int i;
  for (i=0;i<256;i++)
  {
    info->patchesUsed[i]=0;
  }

  int parsing=1;
  int trk,minTrk;
  ulong tempo=(ulong)(500000 * ratioTempo);

#ifdef MIDFILEDEBUG
  printf("Parsing 1 ...\n");
#endif

  int pgminchannel[16];
  for (i=0;i<16;i++) 
  {
    pgminchannel[i]=0;
  }

  int j;
  for (i=0;i<info->ntracks;i++)
  {
    tracks[i]->init();
    tracks[i]->changeTempo(tempo);
  }
  double prevms=0;
  double minTime=0;
  double maxTime;
  MidiEvent *ev=new MidiEvent;
  while (parsing)
  {
    prevms=minTime;
    trk=0;
    minTrk=0;
    maxTime=minTime + 2 * 60000L;
    minTime=maxTime;
    while (trk<info->ntracks)
    {
      if (tracks[trk]->absMsOfNextEvent()<minTime)
      {
	minTrk=trk;
	minTime=tracks[minTrk]->absMsOfNextEvent();
      }
      trk++;
    }
    if ((minTime==maxTime))
    {
      parsing=0;
#ifdef MIDFILEDEBUG
      printf("END of parsing\n");
#endif
    }
    else
    {
      trk=0;
      while (trk<info->ntracks)
      {
	tracks[trk]->currentMs(minTime);
	trk++;
      }
    }
    trk=minTrk;
    tracks[trk]->readEvent(ev);

    switch (ev->command)
    {
      case (MIDI_NOTEON) : 
	if (ev->chn!=PERCUSSION_CHANNEL)
	  info->patchesUsed[pgminchannel[ev->chn]]++;
	else
	  info->patchesUsed[ev->note+128]++;
	break;
      case (MIDI_PGM_CHANGE) :
	pgminchannel[ev->chn]=(ev->patch);
	break;
      case (MIDI_SYSTEM_PREFIX) :
	if (((ev->command|ev->chn)==META_EVENT)&&(ev->d1==ME_SET_TEMPO))
	{
	  tempo=(ulong)(((ev->data[0]<<16)|(ev->data[1]<<8)|(ev->data[2])) * ratioTempo);
	  for (j=0;j<info->ntracks;j++)
	  {
	    tracks[j]->changeTempo(tempo);
	  }
	}
	break;
    }
  }

  delete ev;
  info->millisecsTotal=prevms;

  for (i=0;i<info->ntracks;i++)
  {
    tracks[i]->init();
  }

#ifdef MIDFILEDEBUG
  printf("info.ticksTotal = %ld \n",info->ticksTotal);
  printf("info.ticksPlayed= %ld \n",info->ticksPlayed);
  printf("info.millisecsTotal  = %g \n",info->millisecsTotal);
  printf("info.TicksPerCN = %d \n",info->ticksPerCuarterNote);
#endif

}


void parsePatchesUsed(MidiTrack **tracks,MidiFileInfo *info,int gm)
{
  int i;
  for (i=0;i<256;i++)
  {
    info->patchesUsed[i]=0;
  }
  int parsing=1;
  int trk,minTrk;
  ulong tempo=500000;

#ifdef MIDFILEDEBUG
  printf("Parsing for patches ...\n");
#endif

  int j;
  for (i=0;i<info->ntracks;i++)
  {
    tracks[i]->init();
  }
  double prevms=0;
  double minTime=0;
  double maxTime;
  ulong tmp;
  MidiEvent *ev=new MidiEvent;
  int pgminchannel[16];
  for (i=0;i<16;i++)
  {
    pgminchannel[i]=0;
  }

  while (parsing)
  {
    prevms=minTime;
    trk=0;
    minTrk=0;
    maxTime=minTime + 2 * 60000L;
    minTime=maxTime;
    while (trk<info->ntracks)
    {
      if (tracks[trk]->absMsOfNextEvent()<minTime)
      {
	minTrk=trk;
	minTime=tracks[minTrk]->absMsOfNextEvent();
      }
      trk++;
    }
    if ((minTime==maxTime))
    {
      parsing=0;
#ifdef MIDFILEDEBUG
      printf("END of parsing for patches\n");
#endif
    }
    else
    {
      trk=0;
      while (trk<info->ntracks)
      {
	tracks[trk]->currentMs(minTime);
	trk++;
      }
    }
    trk=minTrk;
    tracks[trk]->readEvent(ev);
    switch (ev->command)
    {
      case (MIDI_NOTEON) : 
	if (ev->chn!=PERCUSSION_CHANNEL)
	  info->patchesUsed[pgminchannel[ev->chn]]++;
	else
	  info->patchesUsed[ev->note+128]++;
	break;
      case (MIDI_PGM_CHANGE) :
	pgminchannel[ev->chn]=(gm==1)?(ev->patch):(MT32toGM[ev->patch]);
	break;
      case (MIDI_SYSTEM_PREFIX) :
	if (((ev->command|ev->chn)==META_EVENT)&&(ev->d1==ME_SET_TEMPO))
	{
	  if (tempoToMetronomeTempo(tmp=((ev->data[0]<<16)|(ev->data[1]<<8)|(ev->data[2])))>=8)
	  {
	    tempo=tmp;
	    //                   printf("setTempo %ld\n",tempo);
	    for (j=0;j<info->ntracks;j++)
	    {
	      tracks[j]->changeTempo(tempo);
	    }
	  }
	}
	break;   
    }
  }

  delete ev;

  for (i=0;i<info->ntracks;i++)
  {
    tracks[i]->init();
  }

}

int fsearch(FILE *fh,const char *text,long *ptr)
  // Search for "text" through the fh file and then returns :
  // text MUST BE smaller than 256 characters
  //   0 if not was found 
  //   1 if it was found and in ptr (if !=NULL) the position where text begins.
{
  if ((text==NULL)||(text[0]==0)) return 0;
  char buf[1024];
  char tmp[256];
  long pos;
  int l=strlen(text);
  int i,k,r;
  while (!feof(fh))
  {
    pos=ftell(fh);
    k=fread(buf,1,1024,fh);
    i=0;
    while (i<k)
    {
      if (buf[i]==text[0])
      {
	if (k-i>=l)
	  r=strncmp(text,&buf[i],l);
	else
	{
	  fseek(fh,pos+i,SEEK_SET);
	  if (fread(tmp,1,l,fh)<(uint)l) return 0;
	  fseek(fh,pos+k,SEEK_SET);
	  r=strncmp(text,tmp,l);
	}
	if (r==0)
	{
	  if (ptr!=NULL) *ptr=pos+i;
	  return 1;
	}
      }
      i++;
    }
  }
  return 0;
}