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