2 * QEMU Proxy for OPL2/3 emulation by MAME team
4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
27 #define ADLIB_KILL_TIMERS 1
29 #define dolog(...) AUD_log ("adlib", __VA_ARGS__)
31 #define ldebug(...) dolog (__VA_ARGS__)
38 void YMF262UpdateOneQEMU (int which, INT16 *dst, int length);
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)
53 } conf = {0x220, 44100};
66 int left, pos, samples;
67 QEMUAudioTimeStamp ats;
73 static AdlibState adlib;
75 static void adlib_stop_opl_timer (AdlibState *s, size_t n)
78 YMF262TimerOver (0, n);
80 OPLTimerOver (s->opl, n);
85 static void adlib_kill_timers (AdlibState *s)
89 for (i = 0; i < 2; ++i) {
93 delta = AUD_time_stamp_get_elapsed_usec_out (s->voice, &s->ats);
95 "delta = %f dexp = %f expired => %d\n",
97 s->dexp[i] / 1000000.0,
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);
108 static IO_WRITE_PROTO(adlib_write)
110 AdlibState *s = opaque;
115 AUD_set_active_out (s->voice, 1);
117 adlib_kill_timers (s);
120 status = YMF262Write (0, a, val);
122 status = OPLWrite (s->opl, a, val);
126 static IO_READ_PROTO(adlib_read)
128 AdlibState *s = opaque;
132 adlib_kill_timers (s);
135 data = YMF262Read (0, a);
137 data = OPLRead (s->opl, a);
142 static void timer_handler (int c, double interval_Sec)
144 AdlibState *s = &adlib;
150 if (interval_Sec == 0.0) {
157 interval = ticks_per_sec * interval_Sec;
158 exp = qemu_get_clock (vm_clock) + interval;
162 s->dexp[n] = interval_Sec * 1000000.0;
163 AUD_init_time_stamp_out (s->voice, &s->ats);
166 static int write_audio (AdlibState *s, int samples)
172 int nbytes, wbytes, wsampl;
174 nbytes = samples << SHIFT;
177 s->mixbuf + (pos << (SHIFT - 1)),
182 wsampl = wbytes >> SHIFT;
185 pos = (pos + wsampl) % s->samples;
197 static void adlib_callback (void *opaque, int free)
199 AdlibState *s = opaque;
200 int samples, net = 0, to_play, written;
202 samples = free >> SHIFT;
203 if (!(s->active && s->enabled) || !samples) {
207 to_play = audio_MIN (s->left, samples);
209 written = write_audio (s, to_play);
215 s->pos = (s->pos + written) % s->samples;
222 samples = audio_MIN (samples, s->samples - s->pos);
228 YMF262UpdateOneQEMU (0, s->mixbuf + s->pos * 2, samples);
230 YM3812UpdateOne (s->opl, s->mixbuf + s->pos, samples);
234 written = write_audio (s, samples);
239 s->pos = (s->pos + written) % s->samples;
248 static void Adlib_fini (AdlibState *s)
260 qemu_free (s->mixbuf);
267 void Adlib_init (void)
269 AdlibState *s = &adlib;
272 if (YMF262Init (1, 14318180, conf.freq)) {
273 dolog ("YMF262Init %d failed\n", conf.freq);
277 YMF262SetTimerHandler (0, timer_handler, 0);
281 s->opl = OPLCreate (OPL_TYPE_YM3812, 3579545, conf.freq);
283 dolog ("OPLCreate %d failed\n", conf.freq);
287 OPLSetTimerHandler (s->opl, timer_handler, 0);
292 s->voice = AUD_open_out (
306 s->samples = AUD_get_buffer_size_out (s->voice) >> SHIFT;
307 s->mixbuf = qemu_mallocz (s->samples << SHIFT);
310 dolog ("not enough memory for adlib mixing buffer (%d)\n",
311 s->samples << SHIFT);
316 register_ioport_read (0x388, 4, 1, adlib_read, s);
317 register_ioport_write (0x388, 4, 1, adlib_write, s);
319 register_ioport_read (conf.port, 4, 1, adlib_read, s);
320 register_ioport_write (conf.port, 4, 1, adlib_write, s);
322 register_ioport_read (conf.port + 8, 2, 1, adlib_read, s);
323 register_ioport_write (conf.port + 8, 2, 1, adlib_write, s);