mirror of
https://github.com/retro100/dosbox-wii.git
synced 2024-06-28 15:16:11 +02:00
400 lines
11 KiB
C++
400 lines
11 KiB
C++
/*
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* Copyright (C) 2002-2019 The DOSBox Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <string.h>
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#include "dosbox.h"
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#include "inout.h"
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#include "mixer.h"
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#include "pic.h"
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#include "setup.h"
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#define DISNEY_BASE 0x0378
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#define DISNEY_SIZE 128
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typedef struct _dac_channel {
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Bit8u buffer[DISNEY_SIZE]; // data buffer
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Bitu used; // current data buffer level
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double speedcheck_sum;
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double speedcheck_last;
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bool speedcheck_failed;
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bool speedcheck_init;
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} dac_channel;
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static struct {
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// parallel port stuff
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Bit8u data;
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Bit8u status;
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Bit8u control;
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// the D/A channels
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dac_channel da[2];
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Bitu last_used;
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MixerObject * mo;
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MixerChannel * chan;
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bool stereo;
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// which channel do we use for mono output?
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// and the channel used for stereo
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dac_channel* leader;
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Bitu state;
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Bitu interface_det;
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Bitu interface_det_ext;
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} disney;
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#define DS_IDLE 0
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#define DS_RUNNING 1
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#define DS_FINISH 2
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#define DS_ANALYZING 3
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static void DISNEY_CallBack(Bitu len);
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static void DISNEY_disable(Bitu) {
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if(disney.mo) {
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disney.chan->AddSilence();
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disney.chan->Enable(false);
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}
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disney.leader = 0;
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disney.last_used = 0;
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disney.state = DS_IDLE;
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disney.interface_det = 0;
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disney.interface_det_ext = 0;
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disney.stereo = false;
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}
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static void DISNEY_enable(Bitu freq) {
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if(freq < 500 || freq > 100000) {
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// try again..
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disney.state = DS_IDLE;
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return;
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} else {
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#if 0
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if(disney.stereo) LOG(LOG_MISC,LOG_NORMAL)("disney enable %d Hz, stereo",freq);
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else LOG(LOG_MISC,LOG_NORMAL)("disney enable %d Hz, mono",freq);
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#endif
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disney.chan->SetFreq(freq);
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disney.chan->Enable(true);
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disney.state = DS_RUNNING;
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}
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}
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static void DISNEY_analyze(Bitu channel){
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switch(disney.state) {
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case DS_RUNNING: // should not get here
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break;
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case DS_IDLE:
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// initialize channel data
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for(int i = 0; i < 2; i++) {
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disney.da[i].used = 0;
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disney.da[i].speedcheck_sum = 0;
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disney.da[i].speedcheck_failed = false;
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disney.da[i].speedcheck_init = false;
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}
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disney.da[channel].speedcheck_last = PIC_FullIndex();
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disney.da[channel].speedcheck_init = true;
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disney.state = DS_ANALYZING;
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break;
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case DS_FINISH:
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{
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// detect stereo: if we have about the same data amount in both channels
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Bits st_diff = disney.da[0].used - disney.da[1].used;
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// find leader channel (the one with higher rate) [this good for the stereo case?]
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if(disney.da[0].used > disney.da[1].used) {
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//disney.monochannel=0;
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disney.leader = &disney.da[0];
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} else {
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//disney.monochannel=1;
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disney.leader = &disney.da[1];
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}
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if((st_diff < 5) && (st_diff > -5)) disney.stereo = true;
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else disney.stereo = false;
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// calculate rate for both channels
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Bitu ch_speed[2];
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for(Bitu i = 0; i < 2; i++) {
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ch_speed[i] = (Bitu)(1.0/((disney.da[i].speedcheck_sum/1000.0) /
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(float)(((float)disney.da[i].used)-1.0))); // -1.75
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}
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// choose the larger value
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DISNEY_enable(ch_speed[0] > ch_speed[1]?
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ch_speed[0]:ch_speed[1]); // TODO
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break;
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}
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case DS_ANALYZING:
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{
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double current = PIC_FullIndex();
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dac_channel* cch = &disney.da[channel];
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if(!cch->speedcheck_init) {
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cch->speedcheck_init = true;
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cch->speedcheck_last = current;
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break;
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}
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cch->speedcheck_sum += current - cch->speedcheck_last;
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//LOG_MSG("t=%f",current - cch->speedcheck_last);
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// sanity checks (printer...)
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if((current - cch-> speedcheck_last) < 0.01 ||
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(current - cch-> speedcheck_last) > 2)
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cch->speedcheck_failed = true;
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// if both are failed we are back at start
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if(disney.da[0].speedcheck_failed && disney.da[1].speedcheck_failed) {
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disney.state=DS_IDLE;
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break;
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}
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cch->speedcheck_last = current;
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// analyze finish condition
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if(disney.da[0].used > 30 || disney.da[1].used > 30)
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disney.state = DS_FINISH;
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break;
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}
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}
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}
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static void disney_write(Bitu port,Bitu val,Bitu iolen) {
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//LOG_MSG("write disney time %f addr%x val %x",PIC_FullIndex(),port,val);
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disney.last_used=PIC_Ticks;
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switch (port-DISNEY_BASE) {
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case 0: /* Data Port */
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{
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disney.data=val;
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// if data is written here too often without using the stereo
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// mechanism we use the simple DAC machanism.
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if(disney.state != DS_RUNNING) {
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disney.interface_det++;
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if(disney.interface_det > 5)
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DISNEY_analyze(0);
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}
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if(disney.interface_det > 5) {
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if(disney.da[0].used < DISNEY_SIZE) {
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disney.da[0].buffer[disney.da[0].used] = disney.data;
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disney.da[0].used++;
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} //else LOG_MSG("disney overflow 0");
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}
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break;
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}
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case 1: /* Status Port */
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LOG(LOG_MISC,LOG_NORMAL)("DISNEY:Status write %x",val);
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break;
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case 2: /* Control Port */
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if((disney.control & 0x2) && !(val & 0x2)) {
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if(disney.state != DS_RUNNING) {
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disney.interface_det = 0;
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disney.interface_det_ext = 0;
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DISNEY_analyze(1);
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}
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// stereo channel latch
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if(disney.da[1].used < DISNEY_SIZE) {
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disney.da[1].buffer[disney.da[1].used] = disney.data;
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disney.da[1].used++;
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} //else LOG_MSG("disney overflow 1");
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}
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if((disney.control & 0x1) && !(val & 0x1)) {
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if(disney.state != DS_RUNNING) {
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disney.interface_det = 0;
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disney.interface_det_ext = 0;
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DISNEY_analyze(0);
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}
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// stereo channel latch
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if(disney.da[0].used < DISNEY_SIZE) {
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disney.da[0].buffer[disney.da[0].used] = disney.data;
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disney.da[0].used++;
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} //else LOG_MSG("disney overflow 0");
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}
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if((disney.control & 0x8) && !(val & 0x8)) {
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// emulate a device with 16-byte sound FIFO
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if(disney.state != DS_RUNNING) {
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disney.interface_det_ext++;
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disney.interface_det = 0;
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if(disney.interface_det_ext > 5) {
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disney.leader = &disney.da[0];
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DISNEY_enable(7000);
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}
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}
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if(disney.interface_det_ext > 5) {
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if(disney.da[0].used < DISNEY_SIZE) {
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disney.da[0].buffer[disney.da[0].used] = disney.data;
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disney.da[0].used++;
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}
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}
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}
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// LOG_WARN("DISNEY:Control write %x",val);
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if (val&0x10) LOG(LOG_MISC,LOG_ERROR)("DISNEY:Parallel IRQ Enabled");
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disney.control=val;
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break;
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}
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}
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static Bitu disney_read(Bitu port,Bitu iolen) {
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Bitu retval;
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switch (port-DISNEY_BASE) {
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case 0: /* Data Port */
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// LOG(LOG_MISC,LOG_NORMAL)("DISNEY:Read from data port");
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return disney.data;
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break;
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case 1: /* Status Port */
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// LOG(LOG_MISC,"DISNEY:Read from status port %X",disney.status);
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retval = 0x07;//0x40; // Stereo-on-1 and (or) New-Stereo DACs present
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if(disney.interface_det_ext > 5) {
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if (disney.leader && disney.leader->used >= 16){
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retval |= 0x40; // ack
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retval &= ~0x4; // interrupt
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}
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}
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if(!(disney.data&0x80)) retval |= 0x80; // pin 9 is wired to pin 11
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return retval;
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break;
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case 2: /* Control Port */
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LOG(LOG_MISC,LOG_NORMAL)("DISNEY:Read from control port");
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return disney.control;
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break;
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}
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return 0xff;
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}
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static void DISNEY_PlayStereo(Bitu len, Bit8u* l, Bit8u* r) {
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static Bit8u stereodata[DISNEY_SIZE*2];
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for(Bitu i = 0; i < len; i++) {
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stereodata[i*2] = l[i];
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stereodata[i*2+1] = r[i];
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}
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disney.chan->AddSamples_s8(len,stereodata);
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}
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static void DISNEY_CallBack(Bitu len) {
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if (!len) return;
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// get the smaller used
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Bitu real_used;
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if(disney.stereo) {
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real_used = disney.da[0].used;
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if(disney.da[1].used < real_used) real_used = disney.da[1].used;
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} else
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real_used = disney.leader->used;
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if (real_used >= len) { // enough data for now
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if(disney.stereo) DISNEY_PlayStereo(len, disney.da[0].buffer, disney.da[1].buffer);
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else disney.chan->AddSamples_m8(len,disney.leader->buffer);
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// put the rest back to start
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for(int i = 0; i < 2; i++) {
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// TODO for mono only one
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memmove(disney.da[i].buffer,&disney.da[i].buffer[len],DISNEY_SIZE/*real_used*/-len);
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disney.da[i].used -= len;
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}
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// TODO: len > DISNEY
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} else { // not enough data
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if(disney.stereo) {
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Bit8u gapfiller0 = 128;
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Bit8u gapfiller1 = 128;
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if(real_used) {
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gapfiller0 = disney.da[0].buffer[real_used-1];
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gapfiller1 = disney.da[1].buffer[real_used-1];
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};
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memset(disney.da[0].buffer+real_used,
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gapfiller0,len-real_used);
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memset(disney.da[1].buffer+real_used,
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gapfiller1,len-real_used);
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DISNEY_PlayStereo(len, disney.da[0].buffer, disney.da[1].buffer);
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len -= real_used;
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} else { // mono
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Bit8u gapfiller = 128; //Keep the middle
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if(real_used) {
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// fix for some stupid game; it outputs 0 at the end of the stream
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// causing a click. So if we have at least two bytes availible in the
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// buffer and the last one is a 0 then ignore that.
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if(disney.leader->buffer[real_used-1]==0)
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real_used--;
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}
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// do it this way because AddSilence sounds like a gnawing mouse
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if(real_used)
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gapfiller = disney.leader->buffer[real_used-1];
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//LOG_MSG("gapfiller %x, fill len %d, realused %d",gapfiller,len-real_used,real_used);
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memset(disney.leader->buffer+real_used, gapfiller, len-real_used);
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disney.chan->AddSamples_m8(len, disney.leader->buffer);
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}
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disney.da[0].used =0;
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disney.da[1].used =0;
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//LOG_MSG("disney underflow %d",len - real_used);
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}
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if (disney.last_used+100<PIC_Ticks) {
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// disable sound output
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PIC_AddEvent(DISNEY_disable,0.0001f); // I think we shouldn't delete the
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// mixer while we are inside it
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}
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}
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class DISNEY: public Module_base {
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private:
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IO_ReadHandleObject ReadHandler;
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IO_WriteHandleObject WriteHandler;
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//MixerObject MixerChan;
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public:
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DISNEY(Section* configuration):Module_base(configuration) {
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Section_prop * section=static_cast<Section_prop *>(configuration);
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if(!section->Get_bool("disney")) return;
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WriteHandler.Install(DISNEY_BASE,disney_write,IO_MB,3);
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ReadHandler.Install(DISNEY_BASE,disney_read,IO_MB,3);
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disney.status=0x84;
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disney.control=0;
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disney.last_used=0;
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disney.mo = new MixerObject();
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disney.chan=disney.mo->Install(&DISNEY_CallBack,10000,"DISNEY");
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DISNEY_disable(0);
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}
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~DISNEY(){
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DISNEY_disable(0);
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if (disney.mo)
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delete disney.mo;
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}
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};
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static DISNEY* test;
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static void DISNEY_ShutDown(Section* sec){
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delete test;
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}
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void DISNEY_Init(Section* sec) {
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test = new DISNEY(sec);
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sec->AddDestroyFunction(&DISNEY_ShutDown,true);
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}
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