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 #include <assert.h>
  25 #include "vl.h"
  26
  27 #define ADLIB_KILL_TIMERS 1
  28
  29 #define dolog(...) AUD_log ("adlib", __VA_ARGS__)
  30 #ifdef DEBUG
  31 #define ldebug(...) dolog (__VA_ARGS__)
  32 #else
  33 #define ldebug(...)
  34 #endif
  35
  36 #ifdef HAS_YMF262
  37 #include "ymf262.h"
  38 void YMF262UpdateOneQEMU (int which, INT16 *dst, int length);
  39 #define SHIFT 2
  40 #else
  41 #include "fmopl.h"
  42 #define SHIFT 1
  43 #endif
  44
  45 #define IO_READ_PROTO(name) \
  46     uint32_t name (void *opaque, uint32_t nport)
  47 #define IO_WRITE_PROTO(name) \
  48     void name (void *opaque, uint32_t nport, uint32_t val)
  49
  50 static struct {
  51     int port;
  52     int freq;
  53 } conf = {0x220, 44100};
  54
  55 typedef struct {
  56     QEMUSoundCard card;
  57     int ticking[2];
  58     int enabled;
  59     int active;
  60     int bufpos;
  61 #ifdef DEBUG
  62     int64_t exp[2];
  63 #endif
  64     int16_t *mixbuf;
  65     uint64_t dexp[2];
  66     SWVoiceOut *voice;
  67     int left, pos, samples;
  68     QEMUAudioTimeStamp ats;
  69 #ifndef HAS_YMF262
  70     FM_OPL *opl;
  71 #endif
  72 } AdlibState;
  73
  74 static AdlibState glob_adlib;
  75
  76 static void adlib_stop_opl_timer (AdlibState *s, size_t n)
  77 {
  78 #ifdef HAS_YMF262
  79     YMF262TimerOver (0, n);
  80 #else
  81     OPLTimerOver (s->opl, n);
  82 #endif
  83     s->ticking[n] = 0;
  84 }
  85
  86 static void adlib_kill_timers (AdlibState *s)
  87 {
  88     size_t i;
  89
  90     for (i = 0; i < 2; ++i) {
  91         if (s->ticking[i]) {
  92             uint64_t delta;
  93
  94             delta = AUD_get_elapsed_usec_out (s->voice, &s->ats);
  95             ldebug (
  96                 "delta = %f dexp = %f expired => %d\n",
  97                 delta / 1000000.0,
  98                 s->dexp[i] / 1000000.0,
  99                 delta >= s->dexp[i]
 100                 );
 101             if (ADLIB_KILL_TIMERS || delta >= s->dexp[i]) {
 102                 adlib_stop_opl_timer (s, i);
 103                 AUD_init_time_stamp_out (s->voice, &s->ats);
 104             }
 105         }
 106     }
 107 }
 108
 109 static IO_WRITE_PROTO(adlib_write)
 110 {
 111     AdlibState *s = opaque;
 112     int a = nport & 3;
 113     int status;
 114
 115     s->active = 1;
 116     AUD_set_active_out (s->voice, 1);
 117
 118     adlib_kill_timers (s);
 119
 120 #ifdef HAS_YMF262
 121     status = YMF262Write (0, a, val);
 122 #else
 123     status = OPLWrite (s->opl, a, val);
 124 #endif
 125 }
 126
 127 static IO_READ_PROTO(adlib_read)
 128 {
 129     AdlibState *s = opaque;
 130     uint8_t data;
 131     int a = nport & 3;
 132
 133     adlib_kill_timers (s);
 134
 135 #ifdef HAS_YMF262
 136     data = YMF262Read (0, a);
 137 #else
 138     data = OPLRead (s->opl, a);
 139 #endif
 140     return data;
 141 }
 142
 143 static void timer_handler (int c, double interval_Sec)
 144 {
 145     AdlibState *s = &glob_adlib;
 146     unsigned n = c & 1;
 147 #ifdef DEBUG
 148     double interval;
 149     int64_t exp;
 150 #endif
 151
 152     if (interval_Sec == 0.0) {
 153         s->ticking[n] = 0;
 154         return;
 155     }
 156
 157     s->ticking[n] = 1;
 158 #ifdef DEBUG
 159     interval = ticks_per_sec * interval_Sec;
 160     exp = qemu_get_clock (vm_clock) + interval;
 161     s->exp[n] = exp;
 162 #endif
 163
 164     s->dexp[n] = interval_Sec * 1000000.0;
 165     AUD_init_time_stamp_out (s->voice, &s->ats);
 166 }
 167
 168 static int write_audio (AdlibState *s, int samples)
 169 {
 170     int net = 0;
 171     int pos = s->pos;
 172
 173     while (samples) {
 174         int nbytes, wbytes, wsampl;
 175
 176         nbytes = samples << SHIFT;
 177         wbytes = AUD_write (
 178             s->voice,
 179             s->mixbuf + (pos << (SHIFT - 1)),
 180             nbytes
 181             );
 182
 183         if (wbytes) {
 184             wsampl = wbytes >> SHIFT;
 185
 186             samples -= wsampl;
 187             pos = (pos + wsampl) % s->samples;
 188
 189             net += wsampl;
 190         }
 191         else {
 192             break;
 193         }
 194     }
 195
 196     return net;
 197 }
 198
 199 static void adlib_callback (void *opaque, int free)
 200 {
 201     AdlibState *s = opaque;
 202     int samples, net = 0, to_play, written;
 203
 204     samples = free >> SHIFT;
 205     if (!(s->active && s->enabled) || !samples) {
 206         return;
 207     }
 208
 209     to_play = audio_MIN (s->left, samples);
 210     while (to_play) {
 211         written = write_audio (s, to_play);
 212
 213         if (written) {
 214             s->left -= written;
 215             samples -= written;
 216             to_play -= written;
 217             s->pos = (s->pos + written) % s->samples;
 218         }
 219         else {
 220             return;
 221         }
 222     }
 223
 224     samples = audio_MIN (samples, s->samples - s->pos);
 225     if (!samples) {
 226         return;
 227     }
 228
 229 #ifdef HAS_YMF262
 230     YMF262UpdateOneQEMU (0, s->mixbuf + s->pos * 2, samples);
 231 #else
 232     YM3812UpdateOne (s->opl, s->mixbuf + s->pos, samples);
 233 #endif
 234
 235     while (samples) {
 236         written = write_audio (s, samples);
 237
 238         if (written) {
 239             net += written;
 240             samples -= written;
 241             s->pos = (s->pos + written) % s->samples;
 242         }
 243         else {
 244             s->left = samples;
 245             return;
 246         }
 247     }
 248 }
 249
 250 static void Adlib_fini (AdlibState *s)
 251 {
 252 #ifdef HAS_YMF262
 253     YMF262Shutdown ();
 254 #else
 255     if (s->opl) {
 256         OPLDestroy (s->opl);
 257         s->opl = NULL;
 258     }
 259 #endif
 260
 261     if (s->mixbuf) {
 262         qemu_free (s->mixbuf);
 263     }
 264
 265     s->active = 0;
 266     s->enabled = 0;
 267     AUD_remove_card (&s->card);
 268 }
 269
 270 int Adlib_init (AudioState *audio)
 271 {
 272     AdlibState *s = &glob_adlib;
 273     audsettings_t as;
 274
 275     if (!audio) {
 276         dolog ("No audio state\n");
 277         return -1;
 278     }
 279
 280 #ifdef HAS_YMF262
 281     if (YMF262Init (1, 14318180, conf.freq)) {
 282         dolog ("YMF262Init %d failed\n", conf.freq);
 283         return -1;
 284     }
 285     else {
 286         YMF262SetTimerHandler (0, timer_handler, 0);
 287         s->enabled = 1;
 288     }
 289 #else
 290     s->opl = OPLCreate (OPL_TYPE_YM3812, 3579545, conf.freq);
 291     if (!s->opl) {
 292         dolog ("OPLCreate %d failed\n", conf.freq);
 293         return -1;
 294     }
 295     else {
 296         OPLSetTimerHandler (s->opl, timer_handler, 0);
 297         s->enabled = 1;
 298     }
 299 #endif
 300
 301     as.freq = conf.freq;
 302     as.nchannels = SHIFT;
 303     as.fmt = AUD_FMT_S16;
 304     as.endianness = AUDIO_HOST_ENDIANNESS;
 305
 306     AUD_register_card (audio, "adlib", &s->card);
 307
 308     s->voice = AUD_open_out (
 309         &s->card,
 310         s->voice,
 311         "adlib",
 312         s,
 313         adlib_callback,
 314         &as
 315         );
 316     if (!s->voice) {
 317         Adlib_fini (s);
 318         return -1;
 319     }
 320
 321     s->samples = AUD_get_buffer_size_out (s->voice) >> SHIFT;
 322     s->mixbuf = qemu_mallocz (s->samples << SHIFT);
 323
 324     if (!s->mixbuf) {
 325         dolog ("Could not allocate mixing buffer, %d samples (each %d bytes)\n",
 326                s->samples, 1 << SHIFT);
 327         Adlib_fini (s);
 328         return -1;
 329     }
 330
 331     register_ioport_read (0x388, 4, 1, adlib_read, s);
 332     register_ioport_write (0x388, 4, 1, adlib_write, s);
 333
 334     register_ioport_read (conf.port, 4, 1, adlib_read, s);
 335     register_ioport_write (conf.port, 4, 1, adlib_write, s);
 336
 337     register_ioport_read (conf.port + 8, 2, 1, adlib_read, s);
 338     register_ioport_write (conf.port + 8, 2, 1, adlib_write, s);
 339
 340     return 0;
 341 }