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-rw-r--r--libkmid/midfile.cc460
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diff --git a/libkmid/midfile.cc b/libkmid/midfile.cc
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-/**************************************************************************
-
- 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 <tqfile.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)
-{
- TQString cmd("gzip -dc " + TDEProcess::quote(gzname));
- FILE *infile = popen( TQFile::encodeName(cmd).data(), "r");
- if (infile==NULL) {
- fprintf(stderr,"ERROR : popen failed : %s\n",TQFile::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;
-}
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