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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)