summaryrefslogtreecommitdiffstats
path: root/libtdemid/midfile.cc
diff options
context:
space:
mode:
Diffstat (limited to 'libtdemid/midfile.cc')
-rw-r--r--libtdemid/midfile.cc460
1 files changed, 460 insertions, 0 deletions
diff --git a/libtdemid/midfile.cc b/libtdemid/midfile.cc
new file mode 100644
index 000000000..f8222b3f8
--- /dev/null
+++ b/libtdemid/midfile.cc
@@ -0,0 +1,460 @@
+/**************************************************************************
+
+ 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/libtdemid.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;
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-04 21:17:27 +0000