src/imfplay.c

   1 /* midi.c
   2  *
   3  * Adlib OPL2/OPL3 FM synthesizer chipset test program.
   4  * Play MIDI file using the OPLx synthesizer (well, poorly anyway)
   5  * (C) 2010-2012 Jonathan Campbell.
   6  * Hackipedia DOS library.
   7  *
   8  * This code is licensed under the LGPL.
   9  * <insert LGPL legal text here>
  10  *
  11  * Compiles for intended target environments:
  12  *   - MS-DOS [pure DOS mode, or Windows or OS/2 DOS Box]
  13  */
  14
  15 #include "src/lib/16_head.h"
  16 #include "src/lib/16_tail.h"
  17 #include "src/lib/16_pm.h"
  18 #include "src/lib/16_ca.h"
  19 #include "src/lib/16_mm.h"
  20 #include "src/lib/16_hc.h"
  21 #include "src/lib/16_dbg.h"
  22 #include "src/lib/16_sd.h"
  23
  24 // #include <stdio.h>
  25 // #include <conio.h> /* this is where Open Watcom hides the outp() etc. functions */
  26 // #include <stdlib.h>
  27 // #include <string.h>
  28 // #include <unistd.h>
  29 // #include <malloc.h>
  30 // #include <ctype.h>
  31 // #include <fcntl.h>
  32 // #include <math.h>
  33 // #include <dos.h>
  34
  35 extern struct glob_game_vars    *ggvv;
  36
  37 /*static void (interrupt *old_irq0)();
  38 static volatile unsigned long irq0_ticks=0;
  39 static volatile unsigned int irq0_cnt=0,irq0_add=0,irq0_max=0;
  40
  41 #pragma pack(push,1)
  42 struct imf_entry {
  43         uint8_t         reg,data;
  44         uint16_t        delay;
  45 };
  46 #pragma pack(pop)
  47
  48 static struct imf_entry*        imf_music=NULL;
  49 static struct imf_entry*        imf_play_ptr=NULL;
  50 static struct imf_entry*        imf_music_end=NULL;
  51 static uint16_t                 imf_delay_countdown=0;
  52
  53 #define PRINTBB {\
  54         printf("-------------------------------------------------------------------------------\n");\
  55         printf("buffer:\n");\
  56         printf("bigbuffer       %Fp\t", gvar->ca.audiosegs[0]);\
  57         printf("&%Fp\n", MEMPTR gvar->ca.audiosegs[0]);\
  58         printf("imf_music       %Fp\t", imf_music);\
  59         printf("&%Fp\n", imf_music);\
  60         printf("imf_play_ptr    %Fp\t", imf_play_ptr);\
  61         printf("&%Fp\n", imf_play_ptr);\
  62         printf("imf_music_end   %Fp\t", imf_music_end);\
  63         printf("&%Fp\n", imf_music_end);\
  64         printf("-------------------------------------------------------------------------------\n");\
  65 }
  66
  67 void imf_free_music(global_game_variables_t *gvar) {
  68         if (imf_music) free(imf_music);
  69         MM_FreePtr(MEMPTR gvar->ca.audiosegs[0], gvar);
  70         imf_music = imf_play_ptr = imf_music_end = NULL;
  71         imf_delay_countdown = 0;
  72 }
  73
  74 int imf_load_music(const char *path, global_game_variables_t *gvar) {
  75         unsigned long len;
  76         unsigned char buf[8];
  77         int fd;
  78
  79         imf_free_music(gvar);
  80
  81         fd = open(path,O_RDONLY|O_BINARY);
  82         if (fd < 0) return 0;
  83
  84         len = lseek(fd,0,SEEK_END);
  85         lseek(fd,0,SEEK_SET);
  86         read(fd,buf,2);
  87         if (buf[0] != 0 || buf[1] != 0) // type 1 IMF
  88                 len = *((uint16_t*)buf);
  89         else
  90                 lseek(fd,0,SEEK_SET);
  91
  92         if (len == 0 || len > 65535UL) {
  93                 close(fd);
  94                 return 0;
  95         }
  96         len -= len & 3;
  97
  98 //      imf_music = malloc(len);
  99         MM_GetPtr(MEMPTR gvar->ca.audiosegs[0],len, gvar);
 100         imf_music = (struct imf_entry *)gvar->ca.audiosegs[0];
 101         if (imf_music == NULL) {
 102                 close(fd);
 103                 return 0;
 104         }
 105         read(fd,imf_music,len);
 106         close(fd);
 107
 108         imf_play_ptr = imf_music;
 109         imf_music_end = imf_music + (len >> 2UL);
 110         PRINTBB;
 111         return 1;
 112 }
 113
 114 // WARNING: subroutine call in interrupt handler. make sure you compile with -zu flag for large/compact memory models
 115 void interrupt irq0()
 116 {
 117         ggvv->ca.sd.irq0_ticks++;
 118         if ((ggvv->ca.sd.irq0_cnt += ggvv->ca.sd.irq0_add) >= ggvv->ca.sd.irq0_max) {
 119                 ggvv->ca.sd.irq0_cnt -= ggvv->ca.sd.irq0_max;
 120                 old_irq0();
 121         }
 122         else {
 123                 p8259_OCW2(0,P8259_OCW2_NON_SPECIFIC_EOI);
 124         }
 125 }
 126
 127 void imf_tick() {
 128         if (imf_delay_countdown == 0) {
 129                 do {
 130                         adlib_write(imf_play_ptr->reg,imf_play_ptr->data);
 131                         imf_delay_countdown = imf_play_ptr->delay;
 132                         imf_play_ptr++;
 133                         if (imf_play_ptr == imf_music_end)
 134                         {
 135                                 printf("replay\n");
 136                                 imf_play_ptr = imf_music;
 137                         }
 138                 } while (imf_delay_countdown == 0);
 139         }
 140         else {
 141                 imf_delay_countdown--;
 142         }
 143 }
 144
 145 void adlib_shut_up() {
 146         int i;
 147
 148         memset(adlib_fm,0,sizeof(adlib_fm));
 149         memset(&adlib_reg_bd,0,sizeof(adlib_reg_bd));
 150         for (i=0;i < adlib_fm_voices;i++) {
 151                 struct adlib_fm_operator *f;
 152                 f = &adlib_fm[i].mod;
 153                 f->ch_a = f->ch_b = f->ch_c = f->ch_d = 1;
 154                 f = &adlib_fm[i].car;
 155                 f->ch_a = f->ch_b = f->ch_c = f->ch_d = 1;
 156         }
 157
 158         for (i=0;i < adlib_fm_voices;i++) {
 159                 struct adlib_fm_operator *f;
 160
 161                 f = &adlib_fm[i].mod;
 162                 f->mod_multiple = 1;
 163                 f->total_level = 63 - 16;
 164                 f->attack_rate = 15;
 165                 f->decay_rate = 4;
 166                 f->sustain_level = 0;
 167                 f->release_rate = 8;
 168                 f->f_number = 400;
 169                 f->sustain = 1;
 170                 f->octave = 4;
 171                 f->key_on = 0;
 172
 173                 f = &adlib_fm[i].car;
 174                 f->mod_multiple = 1;
 175                 f->total_level = 63 - 16;
 176                 f->attack_rate = 15;
 177                 f->decay_rate = 4;
 178                 f->sustain_level = 0;
 179                 f->release_rate = 8;
 180                 f->f_number = 0;
 181                 f->sustain = 1;
 182                 f->octave = 0;
 183                 f->key_on = 0;
 184         }
 185
 186         adlib_apply_all();
 187 }*/
 188
 189 void main(int argc,char **argv) {
 190         static global_game_variables_t gvar;
 191         unsigned long ptick, tickrate = 700;
 192         int c;
 193 #ifdef __DEBUG_CA__
 194         dbg_debugca=1;
 195 #endif
 196 #ifdef __DEBUG_MM_
 197         dbg_debugmm=1;
 198 #endif
 199         ggvv=&gvar;
 200         StartupCAMMPM(&gvar);
 201         printf("ADLIB FM test program IMFPLAY\n");
 202         if (argc < 2) {
 203                 printf("You must specify an IMF file to play\n");
 204 //              return;
 205         }
 206
 207         SD_Initimf(&gvar);
 208
 209         if (!SD_imf_load_music(argv[1], &gvar)) {
 210                 printf("Failed to load IMF Music\n");
 211 //              return;
 212         }
 213
 214         write_8254_system_timer(T8254_REF_CLOCK_HZ / tickrate);
 215         old_irq0 = _dos_getvect(8);     /*IRQ0*/
 216         _dos_setvect(8,irq0);
 217
 218         _cli();
 219         gvar.ca.sd.irq0_ticks = ptick = 0;
 220         _sti();
 221
 222         while (1) {
 223                 unsigned long adv;
 224
 225                 _cli();
 226                 adv = gvar.ca.sd.irq0_ticks - ptick;
 227                 if (adv >= 100UL) adv = 100UL;
 228                 ptick = gvar.ca.sd.irq0_ticks;
 229                 _sti();
 230
 231                 while (adv != 0) {
 232                         SD_imf_tick(&gvar);
 233                         adv--;
 234                 }
 235
 236                 if (kbhit()) {
 237                         c = getch();
 238                         if (c == 0) c = getch() << 8;
 239
 240                         if (c == 27) {
 241                                 break;
 242                         }
 243                 }
 244         }
 245 //      printf("contents of the imf_music\n[\n%s\n]\n", imf_music);
 246
 247         SD_imf_free_music(&gvar);
 248         SD_adlib_shut_up();
 249         shutdown_adlib();
 250         _dos_setvect(8,old_irq0);
 251         write_8254_system_timer(0);     /* back to normal 18.2Hz */
 252         ShutdownCAMMPM(&gvar);
 253 }