hw/audio/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 "qemu/osdep.h"
  26 #include "qapi/error.h"
  27 #include "qemu/module.h"
  28 #include "hw/audio/soundhw.h"
  29 #include "audio/audio.h"
  30 #include "hw/isa/isa.h"
  31 #include "hw/qdev-properties.h"
  32 #include "qom/object.h"
  33
  34 //#define DEBUG
  35
  36 #define ADLIB_KILL_TIMERS 1
  37
  38 #define ADLIB_DESC "Yamaha YM3812 (OPL2)"
  39
  40 #ifdef DEBUG
  41 #include "qemu/timer.h"
  42 #endif
  43
  44 #define dolog(...) AUD_log ("adlib", __VA_ARGS__)
  45 #ifdef DEBUG
  46 #define ldebug(...) dolog (__VA_ARGS__)
  47 #else
  48 #define ldebug(...)
  49 #endif
  50
  51 #include "fmopl.h"
  52 #define SHIFT 1
  53
  54 #define TYPE_ADLIB "adlib"
  55 OBJECT_DECLARE_SIMPLE_TYPE(AdlibState, ADLIB)
  56
  57 struct AdlibState {
  58     ISADevice parent_obj;
  59
  60     QEMUSoundCard card;
  61     uint32_t freq;
  62     uint32_t port;
  63     int ticking[2];
  64     int enabled;
  65     int active;
  66     int bufpos;
  67 #ifdef DEBUG
  68     int64_t exp[2];
  69 #endif
  70     int16_t *mixbuf;
  71     uint64_t dexp[2];
  72     SWVoiceOut *voice;
  73     int left, pos, samples;
  74     QEMUAudioTimeStamp ats;
  75     FM_OPL *opl;
  76     PortioList port_list;
  77 };
  78
  79 static void adlib_stop_opl_timer (AdlibState *s, size_t n)
  80 {
  81     OPLTimerOver (s->opl, n);
  82     s->ticking[n] = 0;
  83 }
  84
  85 static void adlib_kill_timers (AdlibState *s)
  86 {
  87     size_t i;
  88
  89     for (i = 0; i < 2; ++i) {
  90         if (s->ticking[i]) {
  91             uint64_t delta;
  92
  93             delta = AUD_get_elapsed_usec_out (s->voice, &s->ats);
  94             ldebug (
  95                 "delta = %f dexp = %f expired => %d\n",
  96                 delta / 1000000.0,
  97                 s->dexp[i] / 1000000.0,
  98                 delta >= s->dexp[i]
  99                 );
 100             if (ADLIB_KILL_TIMERS || delta >= s->dexp[i]) {
 101                 adlib_stop_opl_timer (s, i);
 102                 AUD_init_time_stamp_out (s->voice, &s->ats);
 103             }
 104         }
 105     }
 106 }
 107
 108 static void adlib_write(void *opaque, uint32_t nport, uint32_t val)
 109 {
 110     AdlibState *s = opaque;
 111     int a = nport & 3;
 112
 113     s->active = 1;
 114     AUD_set_active_out (s->voice, 1);
 115
 116     adlib_kill_timers (s);
 117
 118     OPLWrite (s->opl, a, val);
 119 }
 120
 121 static uint32_t adlib_read(void *opaque, uint32_t nport)
 122 {
 123     AdlibState *s = opaque;
 124     int a = nport & 3;
 125
 126     adlib_kill_timers (s);
 127     return OPLRead (s->opl, a);
 128 }
 129
 130 static void timer_handler (void *opaque, int c, double interval_Sec)
 131 {
 132     AdlibState *s = opaque;
 133     unsigned n = c & 1;
 134 #ifdef DEBUG
 135     double interval;
 136     int64_t exp;
 137 #endif
 138
 139     if (interval_Sec == 0.0) {
 140         s->ticking[n] = 0;
 141         return;
 142     }
 143
 144     s->ticking[n] = 1;
 145 #ifdef DEBUG
 146     interval = NANOSECONDS_PER_SECOND * interval_Sec;
 147     exp = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + interval;
 148     s->exp[n] = exp;
 149 #endif
 150
 151     s->dexp[n] = interval_Sec * 1000000.0;
 152     AUD_init_time_stamp_out (s->voice, &s->ats);
 153 }
 154
 155 static int write_audio (AdlibState *s, int samples)
 156 {
 157     int net = 0;
 158     int pos = s->pos;
 159
 160     while (samples) {
 161         int nbytes, wbytes, wsampl;
 162
 163         nbytes = samples << SHIFT;
 164         wbytes = AUD_write (
 165             s->voice,
 166             s->mixbuf + (pos << (SHIFT - 1)),
 167             nbytes
 168             );
 169
 170         if (wbytes) {
 171             wsampl = wbytes >> SHIFT;
 172
 173             samples -= wsampl;
 174             pos = (pos + wsampl) % s->samples;
 175
 176             net += wsampl;
 177         }
 178         else {
 179             break;
 180         }
 181     }
 182
 183     return net;
 184 }
 185
 186 static void adlib_callback (void *opaque, int free)
 187 {
 188     AdlibState *s = opaque;
 189     int samples, net = 0, to_play, written;
 190
 191     samples = free >> SHIFT;
 192     if (!(s->active && s->enabled) || !samples) {
 193         return;
 194     }
 195
 196     to_play = MIN (s->left, samples);
 197     while (to_play) {
 198         written = write_audio (s, to_play);
 199
 200         if (written) {
 201             s->left -= written;
 202             samples -= written;
 203             to_play -= written;
 204             s->pos = (s->pos + written) % s->samples;
 205         }
 206         else {
 207             return;
 208         }
 209     }
 210
 211     samples = MIN (samples, s->samples - s->pos);
 212     if (!samples) {
 213         return;
 214     }
 215
 216     YM3812UpdateOne (s->opl, s->mixbuf + s->pos, samples);
 217
 218     while (samples) {
 219         written = write_audio (s, samples);
 220
 221         if (written) {
 222             net += written;
 223             samples -= written;
 224             s->pos = (s->pos + written) % s->samples;
 225         }
 226         else {
 227             s->left = samples;
 228             return;
 229         }
 230     }
 231 }
 232
 233 static void Adlib_fini (AdlibState *s)
 234 {
 235     if (s->opl) {
 236         OPLDestroy (s->opl);
 237         s->opl = NULL;
 238     }
 239
 240     g_free(s->mixbuf);
 241
 242     s->active = 0;
 243     s->enabled = 0;
 244     AUD_remove_card (&s->card);
 245 }
 246
 247 static MemoryRegionPortio adlib_portio_list[] = {
 248     { 0, 4, 1, .read = adlib_read, .write = adlib_write, },
 249     { 0, 2, 1, .read = adlib_read, .write = adlib_write, },
 250     { 0x388, 4, 1, .read = adlib_read, .write = adlib_write, },
 251     PORTIO_END_OF_LIST(),
 252 };
 253
 254 static void adlib_realizefn (DeviceState *dev, Error **errp)
 255 {
 256     AdlibState *s = ADLIB(dev);
 257     struct audsettings as;
 258
 259     s->opl = OPLCreate (3579545, s->freq);
 260     if (!s->opl) {
 261         error_setg (errp, "OPLCreate %d failed", s->freq);
 262         return;
 263     }
 264     else {
 265         OPLSetTimerHandler(s->opl, timer_handler, s);
 266         s->enabled = 1;
 267     }
 268
 269     as.freq = s->freq;
 270     as.nchannels = SHIFT;
 271     as.fmt = AUDIO_FORMAT_S16;
 272     as.endianness = AUDIO_HOST_ENDIANNESS;
 273
 274     AUD_register_card ("adlib", &s->card);
 275
 276     s->voice = AUD_open_out (
 277         &s->card,
 278         s->voice,
 279         "adlib",
 280         s,
 281         adlib_callback,
 282         &as
 283         );
 284     if (!s->voice) {
 285         Adlib_fini (s);
 286         error_setg (errp, "Initializing audio voice failed");
 287         return;
 288     }
 289
 290     s->samples = AUD_get_buffer_size_out (s->voice) >> SHIFT;
 291     s->mixbuf = g_malloc0 (s->samples << SHIFT);
 292
 293     adlib_portio_list[0].offset = s->port;
 294     adlib_portio_list[1].offset = s->port + 8;
 295     portio_list_init (&s->port_list, OBJECT(s), adlib_portio_list, s, "adlib");
 296     portio_list_add (&s->port_list, isa_address_space_io(&s->parent_obj), 0);
 297 }
 298
 299 static Property adlib_properties[] = {
 300     DEFINE_AUDIO_PROPERTIES(AdlibState, card),
 301     DEFINE_PROP_UINT32 ("iobase",  AdlibState, port, 0x220),
 302     DEFINE_PROP_UINT32 ("freq",    AdlibState, freq,  44100),
 303     DEFINE_PROP_END_OF_LIST (),
 304 };
 305
 306 static void adlib_class_initfn (ObjectClass *klass, void *data)
 307 {
 308     DeviceClass *dc = DEVICE_CLASS (klass);
 309
 310     dc->realize = adlib_realizefn;
 311     set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
 312     dc->desc = ADLIB_DESC;
 313     device_class_set_props(dc, adlib_properties);
 314 }
 315
 316 static const TypeInfo adlib_info = {
 317     .name          = TYPE_ADLIB,
 318     .parent        = TYPE_ISA_DEVICE,
 319     .instance_size = sizeof (AdlibState),
 320     .class_init    = adlib_class_initfn,
 321 };
 322
 323 static void adlib_register_types (void)
 324 {
 325     type_register_static (&adlib_info);
 326     deprecated_register_soundhw("adlib", ADLIB_DESC, 1, TYPE_ADLIB);
 327 }
 328
 329 type_init (adlib_register_types)