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 "hw/hw.h"
  28 #include "hw/audio/soundhw.h"
  29 #include "audio/audio.h"
  30 #include "hw/isa/isa.h"
  31
  32 //#define DEBUG
  33
  34 #define ADLIB_KILL_TIMERS 1
  35
  36 #define ADLIB_DESC "Yamaha YM3812 (OPL2)"
  37
  38 #ifdef DEBUG
  39 #include "qemu/timer.h"
  40 #endif
  41
  42 #define dolog(...) AUD_log ("adlib", __VA_ARGS__)
  43 #ifdef DEBUG
  44 #define ldebug(...) dolog (__VA_ARGS__)
  45 #else
  46 #define ldebug(...)
  47 #endif
  48
  49 #include "fmopl.h"
  50 #define SHIFT 1
  51
  52 #define TYPE_ADLIB "adlib"
  53 #define ADLIB(obj) OBJECT_CHECK(AdlibState, (obj), TYPE_ADLIB)
  54
  55 typedef struct {
  56     ISADevice parent_obj;
  57
  58     QEMUSoundCard card;
  59     uint32_t freq;
  60     uint32_t port;
  61     int ticking[2];
  62     int enabled;
  63     int active;
  64     int bufpos;
  65 #ifdef DEBUG
  66     int64_t exp[2];
  67 #endif
  68     int16_t *mixbuf;
  69     uint64_t dexp[2];
  70     SWVoiceOut *voice;
  71     int left, pos, samples;
  72     QEMUAudioTimeStamp ats;
  73     FM_OPL *opl;
  74     PortioList port_list;
  75 } AdlibState;
  76
  77 static void adlib_stop_opl_timer (AdlibState *s, size_t n)
  78 {
  79     OPLTimerOver (s->opl, n);
  80     s->ticking[n] = 0;
  81 }
  82
  83 static void adlib_kill_timers (AdlibState *s)
  84 {
  85     size_t i;
  86
  87     for (i = 0; i < 2; ++i) {
  88         if (s->ticking[i]) {
  89             uint64_t delta;
  90
  91             delta = AUD_get_elapsed_usec_out (s->voice, &s->ats);
  92             ldebug (
  93                 "delta = %f dexp = %f expired => %d\n",
  94                 delta / 1000000.0,
  95                 s->dexp[i] / 1000000.0,
  96                 delta >= s->dexp[i]
  97                 );
  98             if (ADLIB_KILL_TIMERS || delta >= s->dexp[i]) {
  99                 adlib_stop_opl_timer (s, i);
 100                 AUD_init_time_stamp_out (s->voice, &s->ats);
 101             }
 102         }
 103     }
 104 }
 105
 106 static void adlib_write(void *opaque, uint32_t nport, uint32_t val)
 107 {
 108     AdlibState *s = opaque;
 109     int a = nport & 3;
 110
 111     s->active = 1;
 112     AUD_set_active_out (s->voice, 1);
 113
 114     adlib_kill_timers (s);
 115
 116     OPLWrite (s->opl, a, val);
 117 }
 118
 119 static uint32_t adlib_read(void *opaque, uint32_t nport)
 120 {
 121     AdlibState *s = opaque;
 122     uint8_t data;
 123     int a = nport & 3;
 124
 125     adlib_kill_timers (s);
 126     data = OPLRead (s->opl, a);
 127
 128     return data;
 129 }
 130
 131 static void timer_handler (void *opaque, int c, double interval_Sec)
 132 {
 133     AdlibState *s = opaque;
 134     unsigned n = c & 1;
 135 #ifdef DEBUG
 136     double interval;
 137     int64_t exp;
 138 #endif
 139
 140     if (interval_Sec == 0.0) {
 141         s->ticking[n] = 0;
 142         return;
 143     }
 144
 145     s->ticking[n] = 1;
 146 #ifdef DEBUG
 147     interval = NANOSECONDS_PER_SECOND * interval_Sec;
 148     exp = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + interval;
 149     s->exp[n] = exp;
 150 #endif
 151
 152     s->dexp[n] = interval_Sec * 1000000.0;
 153     AUD_init_time_stamp_out (s->voice, &s->ats);
 154 }
 155
 156 static int write_audio (AdlibState *s, int samples)
 157 {
 158     int net = 0;
 159     int pos = s->pos;
 160
 161     while (samples) {
 162         int nbytes, wbytes, wsampl;
 163
 164         nbytes = samples << SHIFT;
 165         wbytes = AUD_write (
 166             s->voice,
 167             s->mixbuf + (pos << (SHIFT - 1)),
 168             nbytes
 169             );
 170
 171         if (wbytes) {
 172             wsampl = wbytes >> SHIFT;
 173
 174             samples -= wsampl;
 175             pos = (pos + wsampl) % s->samples;
 176
 177             net += wsampl;
 178         }
 179         else {
 180             break;
 181         }
 182     }
 183
 184     return net;
 185 }
 186
 187 static void adlib_callback (void *opaque, int free)
 188 {
 189     AdlibState *s = opaque;
 190     int samples, net = 0, to_play, written;
 191
 192     samples = free >> SHIFT;
 193     if (!(s->active && s->enabled) || !samples) {
 194         return;
 195     }
 196
 197     to_play = audio_MIN (s->left, samples);
 198     while (to_play) {
 199         written = write_audio (s, to_play);
 200
 201         if (written) {
 202             s->left -= written;
 203             samples -= written;
 204             to_play -= written;
 205             s->pos = (s->pos + written) % s->samples;
 206         }
 207         else {
 208             return;
 209         }
 210     }
 211
 212     samples = audio_MIN (samples, s->samples - s->pos);
 213     if (!samples) {
 214         return;
 215     }
 216
 217     YM3812UpdateOne (s->opl, s->mixbuf + s->pos, samples);
 218
 219     while (samples) {
 220         written = write_audio (s, samples);
 221
 222         if (written) {
 223             net += written;
 224             samples -= written;
 225             s->pos = (s->pos + written) % s->samples;
 226         }
 227         else {
 228             s->left = samples;
 229             return;
 230         }
 231     }
 232 }
 233
 234 static void Adlib_fini (AdlibState *s)
 235 {
 236     if (s->opl) {
 237         OPLDestroy (s->opl);
 238         s->opl = NULL;
 239     }
 240
 241     g_free(s->mixbuf);
 242
 243     s->active = 0;
 244     s->enabled = 0;
 245     AUD_remove_card (&s->card);
 246 }
 247
 248 static MemoryRegionPortio adlib_portio_list[] = {
 249     { 0, 4, 1, .read = adlib_read, .write = adlib_write, },
 250     { 0, 2, 1, .read = adlib_read, .write = adlib_write, },
 251     { 0x388, 4, 1, .read = adlib_read, .write = adlib_write, },
 252     PORTIO_END_OF_LIST(),
 253 };
 254
 255 static void adlib_realizefn (DeviceState *dev, Error **errp)
 256 {
 257     AdlibState *s = ADLIB(dev);
 258     struct audsettings as;
 259
 260     s->opl = OPLCreate (3579545, s->freq);
 261     if (!s->opl) {
 262         error_setg (errp, "OPLCreate %d failed", s->freq);
 263         return;
 264     }
 265     else {
 266         OPLSetTimerHandler(s->opl, timer_handler, s);
 267         s->enabled = 1;
 268     }
 269
 270     as.freq = s->freq;
 271     as.nchannels = SHIFT;
 272     as.fmt = AUD_FMT_S16;
 273     as.endianness = AUDIO_HOST_ENDIANNESS;
 274
 275     AUD_register_card ("adlib", &s->card);
 276
 277     s->voice = AUD_open_out (
 278         &s->card,
 279         s->voice,
 280         "adlib",
 281         s,
 282         adlib_callback,
 283         &as
 284         );
 285     if (!s->voice) {
 286         Adlib_fini (s);
 287         error_setg (errp, "Initializing audio voice failed");
 288         return;
 289     }
 290
 291     s->samples = AUD_get_buffer_size_out (s->voice) >> SHIFT;
 292     s->mixbuf = g_malloc0 (s->samples << SHIFT);
 293
 294     adlib_portio_list[0].offset = s->port;
 295     adlib_portio_list[1].offset = s->port + 8;
 296     portio_list_init (&s->port_list, OBJECT(s), adlib_portio_list, s, "adlib");
 297     portio_list_add (&s->port_list, isa_address_space_io(&s->parent_obj), 0);
 298 }
 299
 300 static Property adlib_properties[] = {
 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     dc->props = 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 int Adlib_init (ISABus *bus)
 324 {
 325     isa_create_simple (bus, TYPE_ADLIB);
 326     return 0;
 327 }
 328
 329 static void adlib_register_types (void)
 330 {
 331     type_register_static (&adlib_info);
 332     isa_register_soundhw("adlib", ADLIB_DESC, Adlib_init);
 333 }
 334
 335 type_init (adlib_register_types)