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readmidi.c
1072 lines (968 loc) · 27.2 KB
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readmidi.c
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/*
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 Perl Artistic License, available in COPYING.
*/
#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] = '\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));
*sysa = s[4];
*sysb = s[5];
free(s);
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]='\0';
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] = '\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, next_pos, pos;
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);
next_pos = SDL_RWtell(rw) + 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. */
{
pos = SDL_RWtell(rw);
if (pos < next_pos)
SDL_RWseek(rw, next_pos - pos, RW_SEEK_CUR);
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 (meep->event.channel >= MAXCHAN)
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);