sys/msdos/sound.c

   1 /* aNetHack 0.0.1       sound.c $ANH-Date: 1432512792 2015/05/25 00:13:12 $  $ANH-Branch: master $:$ANH-Revision: 1.8 $ */
   2 /*   Copyright (c) aNetHack PC Development Team 1993,1995            */
   3 /*   aNetHack may be freely redistributed.  See license for details. */
   4 /*                                                                  */
   5 /*
   6  * sound.c - Hardware sound support
   7  *
   8  *Edit History:
   9  *     Initial Creation                              93/10/01
  10  *     Added PC Speaker Support for BC compilers     95/06/14
  11  *     Completed various fixes                       96/02/19
  12  *
  13  */
  14
  15 #include "hack.h"
  16 #include <stdio.h>
  17 #include "portio.h"
  18
  19 #include <dos.h>
  20 #include <ctype.h>
  21
  22 #ifndef TESTING
  23
  24 #define printf pline
  25
  26 int
  27 assign_soundcard(sopt)
  28 char *sopt;
  29 {
  30     iflags.hassound = 0;
  31 #ifdef PCMUSIC
  32     iflags.usepcspeaker = 0;
  33 #endif
  34
  35     if (strncmpi(sopt, "def", 3) == 0) { /* default */
  36                                          /* do nothing - default */
  37     }
  38 #ifdef PCMUSIC
  39     else if (strncmpi(sopt, "speaker", 7) == 0) { /* pc speaker */
  40         iflags.usepcspeaker = 1;
  41     }
  42 #endif
  43     else if (strncmpi(sopt, "auto", 4) == 0) { /* autodetect */
  44                                                /*
  45                                                 * Auto-detect Priorities (arbitrary for now):
  46                                                 *       Just pcspeaker
  47                                                 */
  48         if (0)
  49             ;
  50 #ifdef PCMUSIC
  51         else
  52             iflags.usepcspeaker = 1;
  53 #endif
  54     } else {
  55         return 0;
  56     }
  57     return 1;
  58 }
  59 #endif
  60
  61 #ifdef PCMUSIC
  62
  63 /* 8254/3 Control Word Defines */
  64
  65 #define CTR0SEL (0 << 6)
  66 #define CTR1SEL (1 << 6)
  67 #define CTR2SEL (2 << 6)
  68 #define RDBACK (3 << 6)
  69
  70 #define LATCH (0 << 4)
  71 #define RW_LSB (1 << 4)
  72 #define RW_MSB (2 << 4) /* If both LSB and MSB are read, LSB is done first \
  73                            */
  74
  75 #define MODE0 (0 << 1) /* Interrupt on terminal count */
  76 #define MODE1 (1 << 1) /* Hardware One-Shot */
  77 #define MODE2 (2 << 1) /* Pulse Generator */
  78 #define MODE3 (3 << 1) /* Square Wave Generator */
  79 #define MODE4 (4 << 1) /* Software Triggered Strobe */
  80 #define MODE5 (5 << 1) /* Hardware Triggered Strobe */
  81
  82 #define BINARY (0 << 0) /* Binary counter (16 bits) */
  83 #define BCD (1 << 0)    /* Binary Coded Decimal (BCD) Counter (4 Decades) */
  84
  85 /* Misc 8254/3 Defines */
  86
  87 #define TIMRFRQ (1193180UL) /* Input frequency to the clock (Hz) */
  88
  89 /* Speaker Defines */
  90
  91 #define TIMER (1 << 0)   /* Timer 2 Output connected to Speaker */
  92 #define SPKR_ON (1 << 1) /* Turn on/off Speaker */
  93
  94 /* Port Definitions */
  95
  96 /* 8254/3 Ports */
  97
  98 #define CTR0 0x40
  99 #define CTR1 0x41
 100 #define CTR2 0x42
 101 #define CTRL 0x43
 102
 103 /* Speaker Port */
 104
 105 #define SPEAKER 0x61
 106
 107 void
 108 startsound(unsigned freq)
 109 {
 110     /* To start a sound on the PC:
 111      *
 112      * First, set the second counter to have the correct frequency:
 113      */
 114
 115     unsigned count;
 116
 117     if (freq == 0)
 118         freq = 523;
 119
 120     count = TIMRFRQ / freq; /* Divide frequencies to get count. */
 121
 122 #ifdef TESTING
 123     printf("freq = %u, count = %u\n", freq, count);
 124 #endif
 125
 126     outportb(CTRL, CTR2SEL | RW_LSB | RW_MSB | MODE3 | BINARY);
 127     outportb(CTR2, count & 0x0FF);
 128     outportb(CTR2, count / 0x100);
 129
 130     /* Next, turn on the speaker */
 131
 132     outportb(SPEAKER, inportb(SPEAKER) | TIMER | SPKR_ON);
 133 }
 134
 135 void
 136 stopsound(void)
 137 {
 138     outportb(SPEAKER, inportb(SPEAKER) & ~(TIMER | SPKR_ON));
 139 }
 140
 141 static unsigned tempo, length, octave, mtype;
 142
 143 /* The important numbers here are 287700UL for the factors and 4050816000UL
 144  * which gives the 440 Hz for the A below middle C. "middle C" is assumed to
 145  * be the C at octave 3. The rest are computed by multiplication/division of
 146  * 2^(1/12) which came out to 1.05946 on my calculator.  It is assumed that
 147  * no one will request an octave beyond 6 or below 0.  (At octave 7, some
 148  * notes still come out ok, but by the end of the octave, the "notes" that
 149  * are produced are just ticks.
 150
 151  * These numbers were chosen by a process based on the C64 tables (which
 152  * weren't standardized) and then were 'standardized' by giving them the
 153  * closest value.  That's why they don't seem to be based on any sensible
 154  * number.
 155  */
 156
 157 unsigned long notefactors[12] = { 483852, 456695, 431063, 406869,
 158                                   384033, 362479, 342135, 322932,
 159                                   304808, 287700, 271553, 256312 };
 160
 161 void
 162 note(long notenum)
 163 {
 164     startsound((unsigned) (4050816000UL / notefactors[notenum % 12]
 165                            >> (7 - notenum / 12)));
 166 }
 167
 168 int notes[7] = { 9, 11, 0, 2, 4, 5, 7 };
 169
 170 char *
 171 startnote(char *c)
 172 {
 173     long n;
 174
 175     n = notes[toupper(*c++) - 'A'] + octave * 12;
 176     if (*c == '#' || *c == '+') {
 177         n++;
 178         c++;
 179     } else if (*c == '-') {
 180         if (n)
 181             n--;
 182         c++;
 183     }
 184
 185     note(n);
 186
 187     return --c;
 188 }
 189
 190 void
 191 delaytime(unsigned time)
 192 {
 193     /* time and twait are in units of milliseconds */
 194
 195     unsigned twait;
 196
 197     switch (toupper(mtype)) {
 198     case 'S':
 199         twait = time / 4;
 200         break;
 201     case 'L':
 202         twait = 0;
 203         break;
 204     default:
 205         twait = time / 8;
 206         break;
 207     }
 208
 209     msleep(time - twait);
 210     stopsound();
 211     msleep(twait);
 212 }
 213
 214 char *
 215 delaynote(char *c)
 216 {
 217     unsigned time = 0;
 218
 219     while (isdigit(*c))
 220         time = time * 10 + (*c++ - '0');
 221
 222     if (!time)
 223         time = length;
 224
 225     time = (unsigned) (240000 / time / tempo);
 226
 227     while (*c == '.') {
 228         time = time * 3 / 2;
 229         c++;
 230     }
 231
 232     delaytime(time);
 233
 234     return c;
 235 }
 236
 237 void
 238 initspeaker(void)
 239 {
 240     tempo = 120, length = 4, octave = 3, mtype = 'N';
 241 }
 242
 243 void
 244 play(char *tune)
 245 {
 246     char *c, *n;
 247     unsigned num;
 248
 249     for (c = tune; *c;) {
 250         sscanf(c + 1, "%u", &num);
 251         for (n = c + 1; isdigit(*n); n++) /* do nothing */
 252             ;
 253         if (isspace(*c))
 254             c++;
 255         else
 256             switch (toupper(*c)) {
 257             case 'A':
 258             case 'B':
 259             case 'C':
 260             case 'D':
 261             case 'E':
 262             case 'F':
 263             case 'G':
 264                 c = startnote(c);
 265             case 'P':
 266                 c = delaynote(++c);
 267                 break;
 268 #if 0
 269                 case 'M': c++; mtype = *c; c++; break;
 270                 case 'T':
 271                     if (num) tempo = num;
 272                     else printf ("Zero Tempo (%s)!\n", c);
 273                     c = n;
 274                     break;
 275                 case 'L':
 276                     if (num) length = num;
 277                     else printf ("Zero Length (%s)!\n", c);
 278                     c = n;
 279                     break;
 280                 case 'O':
 281                     if (num <= 7)
 282                         octave = num;
 283                     c = n;
 284                     break;
 285                 case 'N':
 286                     note (num);
 287                     delaytime ((240000/length/tempo));
 288                     c = n;
 289                     break;
 290                 case '>': if (octave < 7) octave++; c++; break;
 291                 case '<': if (octave) octave--; c++; break;
 292 #endif
 293             case ' ':
 294                 c++;
 295                 break;
 296             default:
 297                 printf("Unrecognized play value (%s)!\n", c);
 298                 return;
 299             }
 300     }
 301 }
 302
 303 #ifndef TESTING
 304 void
 305 pc_speaker(struct obj *instr, char *tune)
 306 {
 307     if (!iflags.usepcspeaker)
 308         return;
 309     initspeaker();
 310     switch (instr->otyp) {
 311     case WOODEN_FLUTE:
 312     case MAGIC_FLUTE:
 313         octave = 5; /* up one octave */
 314         break;
 315     case TOOLED_HORN:
 316     case FROST_HORN:
 317     case FIRE_HORN:
 318         octave = 2; /* drop two octaves */
 319         break;
 320     case BUGLE:
 321         break;
 322     case WOODEN_HARP:
 323     case MAGIC_HARP:
 324         length = 8;
 325         mtype = 'L'; /* fast, legato */
 326         break;
 327     }
 328     play(tune);
 329 }
 330
 331 #else
 332
 333 main()
 334 {
 335     char s[80];
 336     int tool;
 337
 338     initspeaker();
 339     printf("1) flute\n2) horn\n3) harp\n4) other\n");
 340     fgets(s, 80, stdin);
 341     sscanf(s, "%d", &tool);
 342     switch (tool) {
 343     case 1:
 344         octave = 5;
 345         break;
 346     case 2:
 347         octave = 2;
 348         break;
 349     case 3:
 350         length = 8;
 351         mtype = 'L';
 352         break;
 353     default:
 354         break;
 355     }
 356     printf("Enter tune:");
 357     fgets(s, 80, stdin);
 358     play(s);
 359 }
 360 #endif
 361
 362 #endif /* PCMUSIC */
 363
 364 /* sound.c */