readmidi.c
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上传日期:2022-07-21
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文件大小:28k
- /*
- TiMidity -- Experimental MIDI to WAVE converter
- Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program 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 General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <errno.h>
- #include <string.h>
- #include <SDL_rwops.h>
- #include "config.h"
- #include "common.h"
- #include "instrum.h"
- #include "playmidi.h"
- #include "readmidi.h"
- #include "output.h"
- #include "ctrlmode.h"
- int32 quietchannels=0;
- static int midi_port_number;
- char midi_name[FILENAME_MAX+1];
- static int track_info, curr_track, curr_title_track;
- static char title[128];
- #if MAXCHAN <= 16
- #define MERGE_CHANNEL_PORT(ch) ((int)(ch))
- #else
- #define MERGE_CHANNEL_PORT(ch) ((int)(ch) | (midi_port_number << 4))
- #endif
- /* to avoid some unnecessary parameter passing */
- static MidiEventList *evlist;
- static int32 event_count;
- static SDL_RWops *rw;
- static int32 at;
- /* These would both fit into 32 bits, but they are often added in
- large multiples, so it's simpler to have two roomy ints */
- static int32 sample_increment, sample_correction; /*samples per MIDI delta-t*/
- /* Computes how many (fractional) samples one MIDI delta-time unit contains */
- static void compute_sample_increment(int32 tempo, int32 divisions)
- {
- double a;
- a = (double) (tempo) * (double) (play_mode->rate) * (65536.0/1000000.0) /
- (double)(divisions);
- sample_correction = (int32)(a) & 0xFFFF;
- sample_increment = (int32)(a) >> 16;
- ctl->cmsg(CMSG_INFO, VERB_DEBUG, "Samples per delta-t: %d (correction %d)",
- sample_increment, sample_correction);
- }
- /* Read variable-length number (7 bits per byte, MSB first) */
- static int32 getvl(void)
- {
- int32 l=0;
- uint8 c;
- for (;;)
- {
- SDL_RWread(rw,&c,1,1);
- l += (c & 0x7f);
- if (!(c & 0x80)) return l;
- l<<=7;
- }
- }
- static int sysex(uint32 len, uint8 *syschan, uint8 *sysa, uint8 *sysb, SDL_RWops *rw)
- {
- unsigned char *s=(unsigned char *)safe_malloc(len);
- int id, model, ch, port, adhi, adlo, cd, dta, dtb, dtc;
- if (len != (uint32)SDL_RWread(rw, s, 1, len))
- {
- free(s);
- return 0;
- }
- if (len<5) { free(s); return 0; }
- if (curr_track == curr_title_track && track_info > 1) title[0] = ' ';
- id=s[0]; port=s[1]; model=s[2]; adhi=s[3]; adlo=s[4];
- if (id==0x7e && port==0x7f && model==0x09 && adhi==0x01)
- {
- ctl->cmsg(CMSG_TEXT, VERB_VERBOSE, "GM System On", len);
- GM_System_On=1;
- free(s);
- return 0;
- }
- ch = adlo & 0x0f;
- *syschan=(uint8)ch;
- if (id==0x7f && len==7 && port==0x7f && model==0x04 && adhi==0x01)
- {
- ctl->cmsg(CMSG_TEXT, VERB_DEBUG, "Master Volume %d", s[4]+(s[5]<<7));
- free(s);
- *sysa = s[4];
- *sysb = s[5];
- return ME_MASTERVOLUME;
- /** return s[4]+(s[5]<<7); **/
- }
- if (len<8) { free(s); return 0; }
- port &=0x0f;
- ch = (adlo & 0x0f) | ((port & 0x03) << 4);
- *syschan=(uint8)ch;
- cd=s[5]; dta=s[6];
- if (len >= 8) dtb=s[7];
- else dtb=-1;
- if (len >= 9) dtc=s[8];
- else dtc=-1;
- free(s);
- if (id==0x43 && model==0x4c)
- {
- if (!adhi && !adlo && cd==0x7e && !dta)
- {
- ctl->cmsg(CMSG_TEXT, VERB_VERBOSE, "XG System On", len);
- XG_System_On=1;
- #ifdef tplus
- vol_table = xg_vol_table;
- #endif
- }
- else if (adhi == 2 && adlo == 1)
- {
- if (dtb==8) dtb=3;
- switch (cd)
- {
- case 0x00:
- XG_System_reverb_type=(dta<<3)+dtb;
- break;
- case 0x20:
- XG_System_chorus_type=((dta-64)<<3)+dtb;
- break;
- case 0x40:
- XG_System_variation_type=dta;
- break;
- case 0x5a:
- /* dta==0 Insertion; dta==1 System */
- break;
- default: break;
- }
- }
- else if (adhi == 8 && cd <= 40)
- {
- *sysa = dta & 0x7f;
- switch (cd)
- {
- case 0x01: /* bank select MSB */
- return ME_TONE_KIT;
- break;
- case 0x02: /* bank select LSB */
- return ME_TONE_BANK;
- break;
- case 0x03: /* program number */
- /** MIDIEVENT(d->at, ME_PROGRAM, lastchan, a, 0); **/
- return ME_PROGRAM;
- break;
- case 0x08: /* */
- /* d->channel[adlo&0x0f].transpose = (char)(dta-64); */
- channel[ch].transpose = (char)(dta-64);
- ctl->cmsg(CMSG_TEXT, VERB_DEBUG, "transpose channel %d by %d",
- (adlo&0x0f)+1, dta-64);
- break;
- case 0x0b: /* volume */
- return ME_MAINVOLUME;
- break;
- case 0x0e: /* pan */
- return ME_PAN;
- break;
- case 0x12: /* chorus send */
- return ME_CHORUSDEPTH;
- break;
- case 0x13: /* reverb send */
- return ME_REVERBERATION;
- break;
- case 0x14: /* variation send */
- break;
- case 0x18: /* filter cutoff */
- return ME_BRIGHTNESS;
- break;
- case 0x19: /* filter resonance */
- return ME_HARMONICCONTENT;
- break;
- default: break;
- }
- }
- return 0;
- }
- else if (id==0x41 && model==0x42 && adhi==0x12 && adlo==0x40)
- {
- if (dtc<0) return 0;
- if (!cd && dta==0x7f && !dtb && dtc==0x41)
- {
- ctl->cmsg(CMSG_TEXT, VERB_VERBOSE, "GS System On", len);
- GS_System_On=1;
- #ifdef tplus
- vol_table = gs_vol_table;
- #endif
- }
- else if (dta==0x15 && (cd&0xf0)==0x10)
- {
- int chan=cd&0x0f;
- if (!chan) chan=9;
- else if (chan<10) chan--;
- chan = MERGE_CHANNEL_PORT(chan);
- channel[chan].kit=dtb;
- }
- else if (cd==0x01) switch(dta)
- {
- case 0x30:
- switch(dtb)
- {
- case 0: XG_System_reverb_type=16+0; break;
- case 1: XG_System_reverb_type=16+1; break;
- case 2: XG_System_reverb_type=16+2; break;
- case 3: XG_System_reverb_type= 8+0; break;
- case 4: XG_System_reverb_type= 8+1; break;
- case 5: XG_System_reverb_type=32+0; break;
- case 6: XG_System_reverb_type=8*17; break;
- case 7: XG_System_reverb_type=8*18; break;
- }
- break;
- case 0x38:
- switch(dtb)
- {
- case 0: XG_System_chorus_type= 8+0; break;
- case 1: XG_System_chorus_type= 8+1; break;
- case 2: XG_System_chorus_type= 8+2; break;
- case 3: XG_System_chorus_type= 8+4; break;
- case 4: XG_System_chorus_type= -1; break;
- case 5: XG_System_chorus_type= 8*3; break;
- case 6: XG_System_chorus_type= -1; break;
- case 7: XG_System_chorus_type= -1; break;
- }
- break;
- }
- return 0;
- }
- return 0;
- }
- /* Print a string from the file, followed by a newline. Any non-ASCII
- or unprintable characters will be converted to periods. */
- static int dumpstring(int32 len, const char *label)
- {
- signed char *s=safe_malloc(len+1);
- if (len != (int32)SDL_RWread(rw, s, 1, len))
- {
- free(s);
- return -1;
- }
- s[len]=' ';
- while (len--)
- {
- if (s[len]<32)
- s[len]='.';
- }
- ctl->cmsg(CMSG_TEXT, VERB_VERBOSE, "%s%s", label, s);
- free(s);
- return 0;
- }
- #define MIDIEVENT(at,t,ch,pa,pb)
- new=safe_malloc(sizeof(MidiEventList));
- new->event.time=at; new->event.type=t; new->event.channel=ch;
- new->event.a=pa; new->event.b=pb; new->next=0;
- return new;
- #define MAGIC_EOT ((MidiEventList *)(-1))
- /* Read a MIDI event, returning a freshly allocated element that can
- be linked to the event list */
- static MidiEventList *read_midi_event(void)
- {
- static uint8 laststatus, lastchan;
- static uint8 nrpn=0, rpn_msb[16], rpn_lsb[16]; /* one per channel */
- uint8 me, type, a,b,c;
- int32 len;
- MidiEventList *new;
- for (;;)
- {
- at+=getvl();
- if (SDL_RWread(rw,&me,1,1)!=1)
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: read_midi_event: %s",
- current_filename, strerror(errno));
- return 0;
- }
-
- if(me==0xF0 || me == 0xF7) /* SysEx event */
- {
- int32 sret;
- uint8 sysa=0, sysb=0, syschan=0;
- len=getvl();
- sret=sysex(len, &syschan, &sysa, &sysb, rw);
- if (sret)
- {
- MIDIEVENT(at, sret, syschan, sysa, sysb);
- }
- }
- else if(me==0xFF) /* Meta event */
- {
- SDL_RWread(rw,&type,1,1);
- len=getvl();
- if (type>0 && type<16)
- {
- static char *label[]={
- "Text event: ", "Text: ", "Copyright: ", "Track name: ",
- "Instrument: ", "Lyric: ", "Marker: ", "Cue point: "};
- dumpstring(len, label[(type>7) ? 0 : type]);
- }
- else
- switch(type)
- {
- case 0x21: /* MIDI port number */
- if(len == 1)
- {
- SDL_RWread(rw,&midi_port_number,1,1);
- if(midi_port_number == EOF)
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "Warning: "%s": Short midi file.",
- midi_name);
- return 0;
- }
- midi_port_number &= 0x0f;
- if (midi_port_number)
- ctl->cmsg(CMSG_INFO, VERB_VERBOSE,
- "(MIDI port number %d)", midi_port_number);
- midi_port_number &= 0x03;
- }
- else SDL_RWseek(rw, len, RW_SEEK_CUR);
- break;
- case 0x2F: /* End of Track */
- return MAGIC_EOT;
- case 0x51: /* Tempo */
- SDL_RWread(rw,&a,1,1); SDL_RWread(rw,&b,1,1); SDL_RWread(rw,&c,1,1);
- MIDIEVENT(at, ME_TEMPO, c, a, b);
-
- default:
- ctl->cmsg(CMSG_INFO, VERB_DEBUG,
- "(Meta event type 0x%02x, length %ld)", type, len);
- SDL_RWseek(rw, len, RW_SEEK_CUR);
- break;
- }
- }
- else
- {
- a=me;
- if (a & 0x80) /* status byte */
- {
- lastchan=a & 0x0F;
- laststatus=(a>>4) & 0x07;
- SDL_RWread(rw,&a, 1,1);
- a &= 0x7F;
- }
- switch(laststatus)
- {
- case 0: /* Note off */
- SDL_RWread(rw,&b, 1,1);
- b &= 0x7F;
- MIDIEVENT(at, ME_NOTEOFF, lastchan, a,b);
- case 1: /* Note on */
- SDL_RWread(rw,&b, 1,1);
- b &= 0x7F;
- if (curr_track == curr_title_track && track_info > 1) title[0] = ' ';
- MIDIEVENT(at, ME_NOTEON, lastchan, a,b);
- case 2: /* Key Pressure */
- SDL_RWread(rw,&b, 1,1);
- b &= 0x7F;
- MIDIEVENT(at, ME_KEYPRESSURE, lastchan, a, b);
- case 3: /* Control change */
- SDL_RWread(rw,&b, 1,1);
- b &= 0x7F;
- {
- int control=255;
- switch(a)
- {
- case 7: control=ME_MAINVOLUME; break;
- case 10: control=ME_PAN; break;
- case 11: control=ME_EXPRESSION; break;
- case 64: control=ME_SUSTAIN; break;
- case 71: control=ME_HARMONICCONTENT; break;
- case 72: control=ME_RELEASETIME; break;
- case 73: control=ME_ATTACKTIME; break;
- case 74: control=ME_BRIGHTNESS; break;
- case 91: control=ME_REVERBERATION; break;
- case 93: control=ME_CHORUSDEPTH; break;
- case 120: control=ME_ALL_SOUNDS_OFF; break;
- case 121: control=ME_RESET_CONTROLLERS; break;
- case 123: control=ME_ALL_NOTES_OFF; break;
- /* These should be the SCC-1 tone bank switch
- commands. I don't know why there are two, or
- why the latter only allows switching to bank 0.
- Also, some MIDI files use 0 as some sort of
- continuous controller. This will cause lots of
- warnings about undefined tone banks. */
- case 0: if (XG_System_On) control = ME_TONE_KIT; else control=ME_TONE_BANK; break;
- case 32: if (XG_System_On) control = ME_TONE_BANK; break;
- case 100: nrpn=0; rpn_msb[lastchan]=b; break;
- case 101: nrpn=0; rpn_lsb[lastchan]=b; break;
- case 99: nrpn=1; rpn_msb[lastchan]=b; break;
- case 98: nrpn=1; rpn_lsb[lastchan]=b; break;
-
- case 6:
- if (nrpn)
- {
- if (rpn_msb[lastchan]==1) switch (rpn_lsb[lastchan])
- {
- #ifdef tplus
- case 0x08: control=ME_VIBRATO_RATE; break;
- case 0x09: control=ME_VIBRATO_DEPTH; break;
- case 0x0a: control=ME_VIBRATO_DELAY; break;
- #endif
- case 0x20: control=ME_BRIGHTNESS; break;
- case 0x21: control=ME_HARMONICCONTENT; break;
- /*
- case 0x63: envelope attack rate
- case 0x64: envelope decay rate
- case 0x66: envelope release rate
- */
- }
- else switch (rpn_msb[lastchan])
- {
- /*
- case 0x14: filter cutoff frequency
- case 0x15: filter resonance
- case 0x16: envelope attack rate
- case 0x17: envelope decay rate
- case 0x18: pitch coarse
- case 0x19: pitch fine
- */
- case 0x1a: drumvolume[lastchan][0x7f & rpn_lsb[lastchan]] = b; break;
- case 0x1c:
- if (!b) b=(int) (127.0*rand()/(RAND_MAX));
- drumpanpot[lastchan][0x7f & rpn_lsb[lastchan]] = b;
- break;
- case 0x1d: drumreverberation[lastchan][0x7f & rpn_lsb[lastchan]] = b; break;
- case 0x1e: drumchorusdepth[lastchan][0x7f & rpn_lsb[lastchan]] = b; break;
- /*
- case 0x1f: variation send level
- */
- }
- ctl->cmsg(CMSG_INFO, VERB_DEBUG,
- "(Data entry (MSB) for NRPN %02x,%02x: %ld)",
- rpn_msb[lastchan], rpn_lsb[lastchan],
- b);
- break;
- }
-
- switch((rpn_msb[lastchan]<<8) | rpn_lsb[lastchan])
- {
- case 0x0000: /* Pitch bend sensitivity */
- control=ME_PITCH_SENS;
- break;
- case 0x7F7F: /* RPN reset */
- /* reset pitch bend sensitivity to 2 */
- MIDIEVENT(at, ME_PITCH_SENS, lastchan, 2, 0);
- default:
- ctl->cmsg(CMSG_INFO, VERB_DEBUG,
- "(Data entry (MSB) for RPN %02x,%02x: %ld)",
- rpn_msb[lastchan], rpn_lsb[lastchan],
- b);
- break;
- }
- break;
-
- default:
- ctl->cmsg(CMSG_INFO, VERB_DEBUG,
- "(Control %d: %d)", a, b);
- break;
- }
- if (control != 255)
- {
- MIDIEVENT(at, control, lastchan, b, 0);
- }
- }
- break;
- case 4: /* Program change */
- a &= 0x7f;
- MIDIEVENT(at, ME_PROGRAM, lastchan, a, 0);
- case 5: /* Channel pressure - NOT IMPLEMENTED */
- break;
- case 6: /* Pitch wheel */
- SDL_RWread(rw,&b, 1,1);
- b &= 0x7F;
- MIDIEVENT(at, ME_PITCHWHEEL, lastchan, a, b);
- default:
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "*** Can't happen: status 0x%02X, channel 0x%02X",
- laststatus, lastchan);
- break;
- }
- }
- }
-
- return new;
- }
- #undef MIDIEVENT
- /* Read a midi track into the linked list, either merging with any previous
- tracks or appending to them. */
- static int read_track(int append)
- {
- MidiEventList *meep;
- MidiEventList *next, *new;
- int32 len;
- char tmp[4];
- meep=evlist;
- if (append && meep)
- {
- /* find the last event in the list */
- for (; meep->next; meep=meep->next)
- ;
- at=meep->event.time;
- }
- else
- at=0;
- /* Check the formalities */
- if ((SDL_RWread(rw,tmp,1,4) != 4) || (SDL_RWread(rw,&len,4,1) != 1))
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "%s: Can't read track header.", current_filename);
- return -1;
- }
- len=BE_LONG(len);
- if (memcmp(tmp, "MTrk", 4))
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "%s: Corrupt MIDI file.", current_filename);
- return -2;
- }
- for (;;)
- {
- if (!(new=read_midi_event())) /* Some kind of error */
- return -2;
- if (new==MAGIC_EOT) /* End-of-track Hack. */
- {
- return 0;
- }
- next=meep->next;
- while (next && (next->event.time < new->event.time))
- {
- meep=next;
- next=meep->next;
- }
-
- new->next=next;
- meep->next=new;
- event_count++; /* Count the event. (About one?) */
- meep=new;
- }
- }
- /* Free the linked event list from memory. */
- static void free_midi_list(void)
- {
- MidiEventList *meep, *next;
- if (!(meep=evlist)) return;
- while (meep)
- {
- next=meep->next;
- free(meep);
- meep=next;
- }
- evlist=0;
- }
- static void xremap_percussion(int *banknumpt, int *this_notept, int this_kit) {
- int i, newmap;
- int banknum = *banknumpt;
- int this_note = *this_notept;
- int newbank, newnote;
- if (this_kit != 127 && this_kit != 126) return;
- for (i = 0; i < XMAPMAX; i++) {
- newmap = xmap[i][0];
- if (!newmap) return;
- if (this_kit == 127 && newmap != XGDRUM) continue;
- if (this_kit == 126 && newmap != SFXDRUM1) continue;
- if (xmap[i][1] != banknum) continue;
- if (xmap[i][3] != this_note) continue;
- newbank = xmap[i][2];
- newnote = xmap[i][4];
- if (newbank == banknum && newnote == this_note) return;
- if (!drumset[newbank]) return;
- *banknumpt = newbank;
- *this_notept = newnote;
- return;
- }
- }
- /* Allocate an array of MidiEvents and fill it from the linked list of
- events, marking used instruments for loading. Convert event times to
- samples: handle tempo changes. Strip unnecessary events from the list.
- Free the linked list. */
- static MidiEvent *groom_list(int32 divisions,int32 *eventsp,int32 *samplesp)
- {
- MidiEvent *groomed_list, *lp;
- MidiEventList *meep;
- int32 i, our_event_count, tempo, skip_this_event, new_value;
- int32 sample_cum, samples_to_do, at, st, dt, counting_time;
- int current_bank[MAXCHAN], current_banktype[MAXCHAN], current_set[MAXCHAN],
- current_kit[MAXCHAN], current_program[MAXCHAN];
- /* Or should each bank have its own current program? */
- int dset, dnote, drumsflag, mprog;
- for (i=0; i<MAXCHAN; i++)
- {
- current_bank[i]=0;
- current_banktype[i]=0;
- current_set[i]=0;
- current_kit[i]=channel[i].kit;
- current_program[i]=default_program;
- }
- tempo=500000;
- compute_sample_increment(tempo, divisions);
- /* This may allocate a bit more than we need */
- groomed_list=lp=safe_malloc(sizeof(MidiEvent) * (event_count+1));
- meep=evlist;
- our_event_count=0;
- st=at=sample_cum=0;
- counting_time=2; /* We strip any silence before the first NOTE ON. */
- for (i=0; i<event_count; i++)
- {
- skip_this_event=0;
- ctl->cmsg(CMSG_INFO, VERB_DEBUG_SILLY,
- "%6d: ch %2d: event %d (%d,%d)",
- meep->event.time, meep->event.channel + 1,
- meep->event.type, meep->event.a, meep->event.b);
- if (meep->event.type==ME_TEMPO)
- {
- tempo=
- meep->event.channel + meep->event.b * 256 + meep->event.a * 65536;
- compute_sample_increment(tempo, divisions);
- skip_this_event=1;
- }
- else if ((quietchannels & (1<<meep->event.channel)))
- skip_this_event=1;
- else switch (meep->event.type)
- {
- case ME_PROGRAM:
- if (current_kit[meep->event.channel])
- {
- if (current_kit[meep->event.channel]==126)
- {
- /* note request for 2nd sfx rhythm kit */
- if (meep->event.a && drumset[SFXDRUM2])
- {
- current_kit[meep->event.channel]=125;
- current_set[meep->event.channel]=SFXDRUM2;
- new_value=SFXDRUM2;
- }
- else if (!meep->event.a && drumset[SFXDRUM1])
- {
- current_set[meep->event.channel]=SFXDRUM1;
- new_value=SFXDRUM1;
- }
- else
- {
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
- "XG SFX drum set is undefined");
- skip_this_event=1;
- break;
- }
- }
- if (drumset[meep->event.a]) /* Is this a defined drumset? */
- new_value=meep->event.a;
- else
- {
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
- "Drum set %d is undefined", meep->event.a);
- if (drumset[0])
- new_value=meep->event.a=0;
- else
- {
- skip_this_event=1;
- break;
- }
- }
- if (current_set[meep->event.channel] != new_value)
- current_set[meep->event.channel]=new_value;
- else
- skip_this_event=1;
- }
- else
- {
- new_value=meep->event.a;
- if ((current_program[meep->event.channel] != SPECIAL_PROGRAM)
- && (current_program[meep->event.channel] != new_value))
- current_program[meep->event.channel] = new_value;
- else
- skip_this_event=1;
- }
- break;
- case ME_NOTEON:
- if (counting_time)
- counting_time=1;
- drumsflag = current_kit[meep->event.channel];
- if (drumsflag) /* percussion channel? */
- {
- dset = current_set[meep->event.channel];
- dnote=meep->event.a;
- if (XG_System_On) xremap_percussion(&dset, &dnote, drumsflag);
- /*if (current_config_pc42b) pcmap(&dset, &dnote, &mprog, &drumsflag);*/
- if (drumsflag)
- {
- /* Mark this instrument to be loaded */
- if (!(drumset[dset]->tone[dnote].layer))
- {
- drumset[dset]->tone[dnote].layer=
- MAGIC_LOAD_INSTRUMENT;
- }
- else drumset[dset]->tone[dnote].last_used
- = current_tune_number;
- if (!channel[meep->event.channel].name) channel[meep->event.channel].name=
- drumset[dset]->name;
- }
- }
- if (!drumsflag) /* not percussion */
- {
- int chan=meep->event.channel;
- int banknum;
- if (current_banktype[chan]) banknum=SFXBANK;
- else banknum=current_bank[chan];
- mprog = current_program[chan];
- if (mprog==SPECIAL_PROGRAM)
- break;
- if (XG_System_On && banknum==SFXBANK && !tonebank[SFXBANK] && tonebank[120])
- banknum = 120;
- /*if (current_config_pc42b) pcmap(&banknum, &dnote, &mprog, &drumsflag);*/
- if (drumsflag)
- {
- /* Mark this instrument to be loaded */
- if (!(drumset[dset]->tone[dnote].layer))
- {
- drumset[dset]->tone[dnote].layer=MAGIC_LOAD_INSTRUMENT;
- }
- else drumset[dset]->tone[dnote].last_used = current_tune_number;
- if (!channel[meep->event.channel].name) channel[meep->event.channel].name=
- drumset[dset]->name;
- }
- if (!drumsflag)
- {
- /* Mark this instrument to be loaded */
- if (!(tonebank[banknum]->tone[mprog].layer))
- {
- tonebank[banknum]->tone[mprog].layer=MAGIC_LOAD_INSTRUMENT;
- }
- else tonebank[banknum]->tone[mprog].last_used = current_tune_number;
- if (!channel[meep->event.channel].name) channel[meep->event.channel].name=
- tonebank[banknum]->tone[mprog].name;
- }
- }
- break;
- case ME_TONE_KIT:
- if (!meep->event.a || meep->event.a == 127)
- {
- new_value=meep->event.a;
- if (current_kit[meep->event.channel] != new_value)
- current_kit[meep->event.channel]=new_value;
- else
- skip_this_event=1;
- break;
- }
- else if (meep->event.a == 126)
- {
- if (drumset[SFXDRUM1]) /* Is this a defined tone bank? */
- new_value=meep->event.a;
- else
- {
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
- "XG rhythm kit %d is undefined", meep->event.a);
- skip_this_event=1;
- break;
- }
- current_set[meep->event.channel]=SFXDRUM1;
- current_kit[meep->event.channel]=new_value;
- break;
- }
- else if (meep->event.a != SFX_BANKTYPE)
- {
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
- "XG kit %d is impossible", meep->event.a);
- skip_this_event=1;
- break;
- }
- if (current_kit[meep->event.channel])
- {
- skip_this_event=1;
- break;
- }
- if (tonebank[SFXBANK] || tonebank[120]) /* Is this a defined tone bank? */
- new_value=SFX_BANKTYPE;
- else
- {
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
- "XG Sfx bank is undefined");
- skip_this_event=1;
- break;
- }
- if (current_banktype[meep->event.channel]!=new_value)
- current_banktype[meep->event.channel]=new_value;
- else
- skip_this_event=1;
- break;
- case ME_TONE_BANK:
- if (current_kit[meep->event.channel])
- {
- skip_this_event=1;
- break;
- }
- if (XG_System_On && meep->event.a > 0 && meep->event.a < 48) {
- channel[meep->event.channel].variationbank=meep->event.a;
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
- "XG variation bank %d", meep->event.a);
- new_value=meep->event.a=0;
- }
- else if (tonebank[meep->event.a]) /* Is this a defined tone bank? */
- new_value=meep->event.a;
- else
- {
- ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
- "Tone bank %d is undefined", meep->event.a);
- new_value=meep->event.a=0;
- }
- if (current_bank[meep->event.channel]!=new_value)
- current_bank[meep->event.channel]=new_value;
- else
- skip_this_event=1;
- break;
- case ME_HARMONICCONTENT:
- channel[meep->event.channel].harmoniccontent=meep->event.a;
- break;
- case ME_BRIGHTNESS:
- channel[meep->event.channel].brightness=meep->event.a;
- break;
- }
- /* Recompute time in samples*/
- if ((dt=meep->event.time - at) && !counting_time)
- {
- samples_to_do=sample_increment * dt;
- sample_cum += sample_correction * dt;
- if (sample_cum & 0xFFFF0000)
- {
- samples_to_do += ((sample_cum >> 16) & 0xFFFF);
- sample_cum &= 0x0000FFFF;
- }
- st += samples_to_do;
- }
- else if (counting_time==1) counting_time=0;
- if (!skip_this_event)
- {
- /* Add the event to the list */
- *lp=meep->event;
- lp->time=st;
- lp++;
- our_event_count++;
- }
- at=meep->event.time;
- meep=meep->next;
- }
- /* Add an End-of-Track event */
- lp->time=st;
- lp->type=ME_EOT;
- our_event_count++;
- free_midi_list();
-
- *eventsp=our_event_count;
- *samplesp=st;
- return groomed_list;
- }
- MidiEvent *read_midi_file(SDL_RWops *mrw, int32 *count, int32 *sp)
- {
- int32 len, divisions;
- int16 format, tracks, divisions_tmp;
- int i;
- char tmp[4];
- rw = mrw;
- event_count=0;
- at=0;
- evlist=0;
- GM_System_On=GS_System_On=XG_System_On=0;
- /* vol_table = def_vol_table; */
- XG_System_reverb_type=XG_System_chorus_type=XG_System_variation_type=0;
- memset(&drumvolume,-1,sizeof(drumvolume));
- memset(&drumchorusdepth,-1,sizeof(drumchorusdepth));
- memset(&drumreverberation,-1,sizeof(drumreverberation));
- memset(&drumpanpot,NO_PANNING,sizeof(drumpanpot));
- for (i=0; i<MAXCHAN; i++)
- {
- if (ISDRUMCHANNEL(i)) channel[i].kit = 127;
- else channel[i].kit = 0;
- channel[i].brightness = 64;
- channel[i].harmoniccontent = 64;
- channel[i].variationbank = 0;
- channel[i].chorusdepth = 0;
- channel[i].reverberation = 0;
- channel[i].transpose = 0;
- }
- past_riff:
- if ((SDL_RWread(rw,tmp,1,4) != 4) || (SDL_RWread(rw,&len,4,1) != 1))
- {
- /* if (ferror(fp))
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s", current_filename,
- strerror(errno));
- }
- else*/
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "%s: Not a MIDI file!", current_filename);
- return 0;
- }
- len=BE_LONG(len);
- if (!memcmp(tmp, "RIFF", 4))
- {
- SDL_RWread(rw,tmp,1,12);
- goto past_riff;
- }
- if (memcmp(tmp, "MThd", 4) || len < 6)
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "%s: Not a MIDI file!", current_filename);
- return 0;
- }
- SDL_RWread(rw,&format, 2, 1);
- SDL_RWread(rw,&tracks, 2, 1);
- SDL_RWread(rw,&divisions_tmp, 2, 1);
- format=BE_SHORT(format);
- tracks=BE_SHORT(tracks);
- track_info = tracks;
- curr_track = 0;
- curr_title_track = -1;
- divisions_tmp=BE_SHORT(divisions_tmp);
- if (divisions_tmp<0)
- {
- /* SMPTE time -- totally untested. Got a MIDI file that uses this? */
- divisions=
- (int32)(-(divisions_tmp/256)) * (int32)(divisions_tmp & 0xFF);
- }
- else divisions=(int32)(divisions_tmp);
- if (len > 6)
- {
- ctl->cmsg(CMSG_WARNING, VERB_NORMAL,
- "%s: MIDI file header size %ld bytes",
- current_filename, len);
- SDL_RWseek(rw, len-6, RW_SEEK_CUR); /* skip the excess */
- }
- if (format<0 || format >2)
- {
- ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
- "%s: Unknown MIDI file format %d", current_filename, format);
- return 0;
- }
- ctl->cmsg(CMSG_INFO, VERB_VERBOSE,
- "Format: %d Tracks: %d Divisions: %d", format, tracks, divisions);
- /* Put a do-nothing event first in the list for easier processing */
- evlist=safe_malloc(sizeof(MidiEventList));
- evlist->event.time=0;
- evlist->event.type=ME_NONE;
- evlist->next=0;
- event_count++;
- switch(format)
- {
- case 0:
- if (read_track(0))
- {
- free_midi_list();
- return 0;
- }
- else curr_track++;
- break;
- case 1:
- for (i=0; i<tracks; i++)
- if (read_track(0))
- {
- free_midi_list();
- return 0;
- }
- break;
- case 2: /* We simply play the tracks sequentially */
- for (i=0; i<tracks; i++)
- if (read_track(1))
- {
- free_midi_list();
- return 0;
- }
- else curr_track++;
- break;
- }
- return groom_list(divisions, count, sp);
- }