338 lines
7.4 KiB
C
338 lines
7.4 KiB
C
/*
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* QEMU Proxy for OPL2/3 emulation by MAME team
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*
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* Copyright (c) 2004-2005 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw.h"
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#include "audiodev.h"
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#include "audio/audio.h"
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#include "isa.h"
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//#define DEBUG
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#define ADLIB_KILL_TIMERS 1
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#ifdef DEBUG
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#include "qemu-timer.h"
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#endif
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#define dolog(...) AUD_log ("adlib", __VA_ARGS__)
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#ifdef DEBUG
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#define ldebug(...) dolog (__VA_ARGS__)
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#else
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#define ldebug(...)
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#endif
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#ifdef HAS_YMF262
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#include "ymf262.h"
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void YMF262UpdateOneQEMU (int which, INT16 *dst, int length);
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#define SHIFT 2
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#else
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#include "fmopl.h"
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#define SHIFT 1
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#endif
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#define IO_READ_PROTO(name) \
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uint32_t name (void *opaque, uint32_t nport)
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#define IO_WRITE_PROTO(name) \
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void name (void *opaque, uint32_t nport, uint32_t val)
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static struct {
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int port;
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int freq;
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} conf = {0x220, 44100};
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typedef struct {
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QEMUSoundCard card;
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int ticking[2];
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int enabled;
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int active;
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int bufpos;
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#ifdef DEBUG
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int64_t exp[2];
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#endif
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int16_t *mixbuf;
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uint64_t dexp[2];
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SWVoiceOut *voice;
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int left, pos, samples;
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QEMUAudioTimeStamp ats;
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#ifndef HAS_YMF262
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FM_OPL *opl;
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#endif
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} AdlibState;
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static AdlibState glob_adlib;
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static void adlib_stop_opl_timer (AdlibState *s, size_t n)
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{
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#ifdef HAS_YMF262
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YMF262TimerOver (0, n);
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#else
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OPLTimerOver (s->opl, n);
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#endif
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s->ticking[n] = 0;
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}
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static void adlib_kill_timers (AdlibState *s)
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{
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size_t i;
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for (i = 0; i < 2; ++i) {
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if (s->ticking[i]) {
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uint64_t delta;
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delta = AUD_get_elapsed_usec_out (s->voice, &s->ats);
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ldebug (
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"delta = %f dexp = %f expired => %d\n",
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delta / 1000000.0,
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s->dexp[i] / 1000000.0,
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delta >= s->dexp[i]
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);
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if (ADLIB_KILL_TIMERS || delta >= s->dexp[i]) {
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adlib_stop_opl_timer (s, i);
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AUD_init_time_stamp_out (s->voice, &s->ats);
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}
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}
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}
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}
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static IO_WRITE_PROTO (adlib_write)
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{
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AdlibState *s = opaque;
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int a = nport & 3;
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s->active = 1;
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AUD_set_active_out (s->voice, 1);
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adlib_kill_timers (s);
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#ifdef HAS_YMF262
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YMF262Write (0, a, val);
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#else
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OPLWrite (s->opl, a, val);
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#endif
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}
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static IO_READ_PROTO (adlib_read)
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{
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AdlibState *s = opaque;
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uint8_t data;
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int a = nport & 3;
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adlib_kill_timers (s);
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#ifdef HAS_YMF262
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data = YMF262Read (0, a);
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#else
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data = OPLRead (s->opl, a);
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#endif
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return data;
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}
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static void timer_handler (int c, double interval_Sec)
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{
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AdlibState *s = &glob_adlib;
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unsigned n = c & 1;
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#ifdef DEBUG
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double interval;
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int64_t exp;
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#endif
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if (interval_Sec == 0.0) {
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s->ticking[n] = 0;
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return;
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}
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s->ticking[n] = 1;
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#ifdef DEBUG
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interval = get_ticks_per_sec() * interval_Sec;
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exp = qemu_get_clock_ns (vm_clock) + interval;
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s->exp[n] = exp;
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#endif
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s->dexp[n] = interval_Sec * 1000000.0;
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AUD_init_time_stamp_out (s->voice, &s->ats);
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}
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static int write_audio (AdlibState *s, int samples)
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{
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int net = 0;
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int pos = s->pos;
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while (samples) {
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int nbytes, wbytes, wsampl;
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nbytes = samples << SHIFT;
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wbytes = AUD_write (
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s->voice,
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s->mixbuf + (pos << (SHIFT - 1)),
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nbytes
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);
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if (wbytes) {
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wsampl = wbytes >> SHIFT;
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samples -= wsampl;
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pos = (pos + wsampl) % s->samples;
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net += wsampl;
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}
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else {
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break;
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}
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}
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return net;
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}
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static void adlib_callback (void *opaque, int free)
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{
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AdlibState *s = opaque;
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int samples, net = 0, to_play, written;
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samples = free >> SHIFT;
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if (!(s->active && s->enabled) || !samples) {
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return;
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}
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to_play = audio_MIN (s->left, samples);
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while (to_play) {
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written = write_audio (s, to_play);
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if (written) {
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s->left -= written;
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samples -= written;
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to_play -= written;
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s->pos = (s->pos + written) % s->samples;
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}
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else {
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return;
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}
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}
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samples = audio_MIN (samples, s->samples - s->pos);
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if (!samples) {
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return;
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}
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#ifdef HAS_YMF262
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YMF262UpdateOneQEMU (0, s->mixbuf + s->pos * 2, samples);
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#else
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YM3812UpdateOne (s->opl, s->mixbuf + s->pos, samples);
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#endif
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while (samples) {
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written = write_audio (s, samples);
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if (written) {
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net += written;
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samples -= written;
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s->pos = (s->pos + written) % s->samples;
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}
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else {
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s->left = samples;
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return;
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}
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}
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}
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static void Adlib_fini (AdlibState *s)
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{
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#ifdef HAS_YMF262
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YMF262Shutdown ();
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#else
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if (s->opl) {
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OPLDestroy (s->opl);
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s->opl = NULL;
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}
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#endif
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if (s->mixbuf) {
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g_free (s->mixbuf);
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}
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s->active = 0;
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s->enabled = 0;
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AUD_remove_card (&s->card);
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}
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int Adlib_init (qemu_irq *pic)
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{
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AdlibState *s = &glob_adlib;
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struct audsettings as;
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#ifdef HAS_YMF262
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if (YMF262Init (1, 14318180, conf.freq)) {
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dolog ("YMF262Init %d failed\n", conf.freq);
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return -1;
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}
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else {
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YMF262SetTimerHandler (0, timer_handler, 0);
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s->enabled = 1;
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}
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#else
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s->opl = OPLCreate (OPL_TYPE_YM3812, 3579545, conf.freq);
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if (!s->opl) {
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dolog ("OPLCreate %d failed\n", conf.freq);
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return -1;
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}
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else {
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OPLSetTimerHandler (s->opl, timer_handler, 0);
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s->enabled = 1;
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}
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#endif
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as.freq = conf.freq;
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as.nchannels = SHIFT;
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as.fmt = AUD_FMT_S16;
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as.endianness = AUDIO_HOST_ENDIANNESS;
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AUD_register_card ("adlib", &s->card);
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s->voice = AUD_open_out (
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&s->card,
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s->voice,
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"adlib",
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s,
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adlib_callback,
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&as
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);
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if (!s->voice) {
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Adlib_fini (s);
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return -1;
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}
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s->samples = AUD_get_buffer_size_out (s->voice) >> SHIFT;
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s->mixbuf = g_malloc0 (s->samples << SHIFT);
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register_ioport_read (0x388, 4, 1, adlib_read, s);
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register_ioport_write (0x388, 4, 1, adlib_write, s);
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register_ioport_read (conf.port, 4, 1, adlib_read, s);
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register_ioport_write (conf.port, 4, 1, adlib_write, s);
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register_ioport_read (conf.port + 8, 2, 1, adlib_read, s);
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register_ioport_write (conf.port + 8, 2, 1, adlib_write, s);
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return 0;
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}
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