mirror of https://gitee.com/openkylin/qemu.git
314 lines
7.4 KiB
C
314 lines
7.4 KiB
C
/*
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* QEMU Adlib emulation
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*
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* Copyright (c) 2004 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 "vl.h"
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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 USE_YMF262
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#define HAS_YMF262 1
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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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#ifdef _WIN32
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#include <windows.h>
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#define small_delay() Sleep (1)
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#else
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#define small_delay() usleep (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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int enabled;
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int active;
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int cparam;
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int64_t ticks;
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int bufpos;
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int16_t *mixbuf;
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double interval;
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QEMUTimer *ts, *opl_ts;
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SWVoice *voice;
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int left, pos, samples, bytes_per_second, old_free;
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int refcount;
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#ifndef USE_YMF262
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FM_OPL *opl;
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#endif
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} AdlibState;
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static AdlibState adlib;
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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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int status;
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s->ticks = qemu_get_clock (vm_clock);
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s->active = 1;
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AUD_enable (s->voice, 1);
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#ifdef USE_YMF262
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status = YMF262Write (0, a, val);
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#else
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status = 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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#ifdef USE_YMF262
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(void) s;
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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 OPL_timer (void *opaque)
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{
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AdlibState *s = opaque;
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#ifdef USE_YMF262
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YMF262TimerOver (s->cparam >> 1, s->cparam & 1);
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#else
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OPLTimerOver (s->opl, s->cparam);
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#endif
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qemu_mod_timer (s->opl_ts, qemu_get_clock (vm_clock) + s->interval);
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}
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static void YMF262TimerHandler (int c, double interval_Sec)
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{
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AdlibState *s = &adlib;
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if (interval_Sec == 0.0) {
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qemu_del_timer (s->opl_ts);
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return;
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}
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s->cparam = c;
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s->interval = ticks_per_sec * interval_Sec;
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qemu_mod_timer (s->opl_ts, qemu_get_clock (vm_clock) + s->interval);
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small_delay ();
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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 ss = samples;
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while (samples) {
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int nbytes = samples << SHIFT;
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int wbytes = AUD_write (s->voice,
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s->mixbuf + (s->pos << (SHIFT - 1)),
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nbytes);
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int wsampl = wbytes >> SHIFT;
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samples -= wsampl;
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s->pos = (s->pos + wsampl) % s->samples;
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net += wsampl;
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if (!wbytes)
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break;
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}
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if (net > ss) {
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dolog ("WARNING: net > ss\n");
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}
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return net;
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}
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static void timer (void *opaque)
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{
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AdlibState *s = opaque;
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int elapsed, samples, net = 0;
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if (s->refcount)
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dolog ("refcount=%d\n", s->refcount);
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s->refcount += 1;
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if (!(s->active && s->enabled))
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goto reset;
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AUD_run ();
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while (s->left) {
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int written = write_audio (s, s->left);
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net += written;
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if (!written)
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goto reset2;
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s->left -= written;
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}
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s->pos = 0;
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elapsed = AUD_calc_elapsed (s->voice);
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if (!elapsed)
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goto reset2;
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/* elapsed = AUD_get_free (s->voice); */
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samples = elapsed >> SHIFT;
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if (!samples)
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goto reset2;
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samples = audio_MIN (samples, s->samples - s->pos);
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if (s->left)
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dolog ("left=%d samples=%d elapsed=%d free=%d\n",
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s->left, samples, elapsed, AUD_get_free (s->voice));
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if (!samples)
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goto reset2;
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#ifdef USE_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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int written = write_audio (s, samples);
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net += written;
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if (!written)
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break;
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samples -= written;
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}
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if (!samples)
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s->pos = 0;
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s->left = samples;
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reset2:
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AUD_adjust (s->voice, net << SHIFT);
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reset:
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qemu_mod_timer (s->ts, qemu_get_clock (vm_clock) + ticks_per_sec / 1024);
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s->refcount -= 1;
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}
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static void Adlib_fini (AdlibState *s)
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{
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#ifdef USE_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->opl_ts)
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qemu_free_timer (s->opl_ts);
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if (s->ts)
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qemu_free_timer (s->ts);
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#define maybe_free(p) if (p) qemu_free (p)
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maybe_free (s->mixbuf);
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#undef maybe_free
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s->active = 0;
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s->enabled = 0;
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}
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void Adlib_init (void)
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{
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AdlibState *s = &adlib;
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memset (s, 0, sizeof (*s));
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#ifdef USE_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;
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}
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else {
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YMF262SetTimerHandler (0, YMF262TimerHandler, 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;
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}
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else {
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OPLSetTimerHandler (s->opl, YMF262TimerHandler, 0);
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s->enabled = 1;
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}
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#endif
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s->opl_ts = qemu_new_timer (vm_clock, OPL_timer, s);
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if (!s->opl_ts) {
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dolog ("Can not get timer for adlib emulation\n");
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Adlib_fini (s);
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return;
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}
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s->ts = qemu_new_timer (vm_clock, timer, s);
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if (!s->opl_ts) {
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dolog ("Can not get timer for adlib emulation\n");
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Adlib_fini (s);
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return;
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}
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s->voice = AUD_open (s->voice, "adlib", conf.freq, SHIFT, AUD_FMT_S16);
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if (!s->voice) {
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Adlib_fini (s);
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return;
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}
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s->bytes_per_second = conf.freq << SHIFT;
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s->samples = AUD_get_buffer_size (s->voice) >> SHIFT;
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s->mixbuf = qemu_mallocz (s->samples << SHIFT);
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if (!s->mixbuf) {
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dolog ("not enough memory for adlib mixing buffer (%d)\n",
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s->samples << SHIFT);
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Adlib_fini (s);
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return;
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}
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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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qemu_mod_timer (s->ts, qemu_get_clock (vm_clock) + 1);
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}
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