hw/adlib.c

   1 /*
   2  * QEMU Proxy for OPL2/3 emulation by MAME team
   3  *
   4  * Copyright (c) 2004-2005 Vassili Karpov (malc)
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "hw.h"
  26 #include "audiodev.h"
  27 #include "audio/audio.h"
  28 #include "isa.h"
  29
  30 //#define DEBUG
  31
  32 #define ADLIB_KILL_TIMERS 1
  33
  34 #ifdef DEBUG
  35 #include "qemu-timer.h"
  36 #endif
  37
  38 #define dolog(...) AUD_log ("adlib", __VA_ARGS__)
  39 #ifdef DEBUG
  40 #define ldebug(...) dolog (__VA_ARGS__)
  41 #else
  42 #define ldebug(...)
  43 #endif
  44
  45 #ifdef HAS_YMF262
  46 #include "ymf262.h"
  47 void YMF262UpdateOneQEMU (int which, INT16 *dst, int length);
  48 #define SHIFT 2
  49 #else
  50 #include "fmopl.h"
  51 #define SHIFT 1
  52 #endif
  53
  54 #define IO_READ_PROTO(name) \
  55     uint32_t name (void *opaque, uint32_t nport)
  56 #define IO_WRITE_PROTO(name) \
  57     void name (void *opaque, uint32_t nport, uint32_t val)
  58
  59 static struct {
  60     int port;
  61     int freq;
  62 } conf = {0x220, 44100};
  63
  64 typedef struct {
  65     QEMUSoundCard card;
  66     int ticking[2];
  67     int enabled;
  68     int active;
  69     int bufpos;
  70 #ifdef DEBUG
  71     int64_t exp[2];
  72 #endif
  73     int16_t *mixbuf;
  74     uint64_t dexp[2];
  75     SWVoiceOut *voice;
  76     int left, pos, samples;
  77     QEMUAudioTimeStamp ats;
  78 #ifndef HAS_YMF262
  79     FM_OPL *opl;
  80 #endif
  81 } AdlibState;
  82
  83 static AdlibState glob_adlib;
  84
  85 static void adlib_stop_opl_timer (AdlibState *s, size_t n)
  86 {
  87 #ifdef HAS_YMF262
  88     YMF262TimerOver (0, n);
  89 #else
  90     OPLTimerOver (s->opl, n);
  91 #endif
  92     s->ticking[n] = 0;
  93 }
  94
  95 static void adlib_kill_timers (AdlibState *s)
  96 {
  97     size_t i;
  98
  99     for (i = 0; i < 2; ++i) {
 100         if (s->ticking[i]) {
 101             uint64_t delta;
 102
 103             delta = AUD_get_elapsed_usec_out (s->voice, &s->ats);
 104             ldebug (
 105                 "delta = %f dexp = %f expired => %d\n",
 106                 delta / 1000000.0,
 107                 s->dexp[i] / 1000000.0,
 108                 delta >= s->dexp[i]
 109                 );
 110             if (ADLIB_KILL_TIMERS || delta >= s->dexp[i]) {
 111                 adlib_stop_opl_timer (s, i);
 112                 AUD_init_time_stamp_out (s->voice, &s->ats);
 113             }
 114         }
 115     }
 116 }
 117
 118 static IO_WRITE_PROTO (adlib_write)
 119 {
 120     AdlibState *s = opaque;
 121     int a = nport & 3;
 122     int status;
 123
 124     s->active = 1;
 125     AUD_set_active_out (s->voice, 1);
 126
 127     adlib_kill_timers (s);
 128
 129 #ifdef HAS_YMF262
 130     status = YMF262Write (0, a, val);
 131 #else
 132     status = OPLWrite (s->opl, a, val);
 133 #endif
 134 }
 135
 136 static IO_READ_PROTO (adlib_read)
 137 {
 138     AdlibState *s = opaque;
 139     uint8_t data;
 140     int a = nport & 3;
 141
 142     adlib_kill_timers (s);
 143
 144 #ifdef HAS_YMF262
 145     data = YMF262Read (0, a);
 146 #else
 147     data = OPLRead (s->opl, a);
 148 #endif
 149     return data;
 150 }
 151
 152 static void timer_handler (int c, double interval_Sec)
 153 {
 154     AdlibState *s = &glob_adlib;
 155     unsigned n = c & 1;
 156 #ifdef DEBUG
 157     double interval;
 158     int64_t exp;
 159 #endif
 160
 161     if (interval_Sec == 0.0) {
 162         s->ticking[n] = 0;
 163         return;
 164     }
 165
 166     s->ticking[n] = 1;
 167 #ifdef DEBUG
 168     interval = get_ticks_per_sec() * interval_Sec;
 169     exp = qemu_get_clock (vm_clock) + interval;
 170     s->exp[n] = exp;
 171 #endif
 172
 173     s->dexp[n] = interval_Sec * 1000000.0;
 174     AUD_init_time_stamp_out (s->voice, &s->ats);
 175 }
 176
 177 static int write_audio (AdlibState *s, int samples)
 178 {
 179     int net = 0;
 180     int pos = s->pos;
 181
 182     while (samples) {
 183         int nbytes, wbytes, wsampl;
 184
 185         nbytes = samples << SHIFT;
 186         wbytes = AUD_write (
 187             s->voice,
 188             s->mixbuf + (pos << (SHIFT - 1)),
 189             nbytes
 190             );
 191
 192         if (wbytes) {
 193             wsampl = wbytes >> SHIFT;
 194
 195             samples -= wsampl;
 196             pos = (pos + wsampl) % s->samples;
 197
 198             net += wsampl;
 199         }
 200         else {
 201             break;
 202         }
 203     }
 204
 205     return net;
 206 }
 207
 208 static void adlib_callback (void *opaque, int free)
 209 {
 210     AdlibState *s = opaque;
 211     int samples, net = 0, to_play, written;
 212
 213     samples = free >> SHIFT;
 214     if (!(s->active && s->enabled) || !samples) {
 215         return;
 216     }
 217
 218     to_play = audio_MIN (s->left, samples);
 219     while (to_play) {
 220         written = write_audio (s, to_play);
 221
 222         if (written) {
 223             s->left -= written;
 224             samples -= written;
 225             to_play -= written;
 226             s->pos = (s->pos + written) % s->samples;
 227         }
 228         else {
 229             return;
 230         }
 231     }
 232
 233     samples = audio_MIN (samples, s->samples - s->pos);
 234     if (!samples) {
 235         return;
 236     }
 237
 238 #ifdef HAS_YMF262
 239     YMF262UpdateOneQEMU (0, s->mixbuf + s->pos * 2, samples);
 240 #else
 241     YM3812UpdateOne (s->opl, s->mixbuf + s->pos, samples);
 242 #endif
 243
 244     while (samples) {
 245         written = write_audio (s, samples);
 246
 247         if (written) {
 248             net += written;
 249             samples -= written;
 250             s->pos = (s->pos + written) % s->samples;
 251         }
 252         else {
 253             s->left = samples;
 254             return;
 255         }
 256     }
 257 }
 258
 259 static void Adlib_fini (AdlibState *s)
 260 {
 261 #ifdef HAS_YMF262
 262     YMF262Shutdown ();
 263 #else
 264     if (s->opl) {
 265         OPLDestroy (s->opl);
 266         s->opl = NULL;
 267     }
 268 #endif
 269
 270     if (s->mixbuf) {
 271         qemu_free (s->mixbuf);
 272     }
 273
 274     s->active = 0;
 275     s->enabled = 0;
 276     AUD_remove_card (&s->card);
 277 }
 278
 279 int Adlib_init (qemu_irq *pic)
 280 {
 281     AdlibState *s = &glob_adlib;
 282     struct audsettings as;
 283
 284 #ifdef HAS_YMF262
 285     if (YMF262Init (1, 14318180, conf.freq)) {
 286         dolog ("YMF262Init %d failed\n", conf.freq);
 287         return -1;
 288     }
 289     else {
 290         YMF262SetTimerHandler (0, timer_handler, 0);
 291         s->enabled = 1;
 292     }
 293 #else
 294     s->opl = OPLCreate (OPL_TYPE_YM3812, 3579545, conf.freq);
 295     if (!s->opl) {
 296         dolog ("OPLCreate %d failed\n", conf.freq);
 297         return -1;
 298     }
 299     else {
 300         OPLSetTimerHandler (s->opl, timer_handler, 0);
 301         s->enabled = 1;
 302     }
 303 #endif
 304
 305     as.freq = conf.freq;
 306     as.nchannels = SHIFT;
 307     as.fmt = AUD_FMT_S16;
 308     as.endianness = AUDIO_HOST_ENDIANNESS;
 309
 310     AUD_register_card ("adlib", &s->card);
 311
 312     s->voice = AUD_open_out (
 313         &s->card,
 314         s->voice,
 315         "adlib",
 316         s,
 317         adlib_callback,
 318         &as
 319         );
 320     if (!s->voice) {
 321         Adlib_fini (s);
 322         return -1;
 323     }
 324
 325     s->samples = AUD_get_buffer_size_out (s->voice) >> SHIFT;
 326     s->mixbuf = qemu_mallocz (s->samples << SHIFT);
 327
 328     register_ioport_read (0x388, 4, 1, adlib_read, s);
 329     register_ioport_write (0x388, 4, 1, adlib_write, s);
 330
 331     register_ioport_read (conf.port, 4, 1, adlib_read, s);
 332     register_ioport_write (conf.port, 4, 1, adlib_write, s);
 333
 334     register_ioport_read (conf.port + 8, 2, 1, adlib_read, s);
 335     register_ioport_write (conf.port + 8, 2, 1, adlib_write, s);
 336
 337     return 0;
 338 }