147 lines
3.5 KiB
C++
147 lines
3.5 KiB
C++
/*
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* Copyright (C) 2002 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 Library 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <math.h>
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#include "dosbox.h"
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#include "mixer.h"
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#include "timer.h"
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#include "setup.h"
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#ifndef PI
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#define PI 3.14159265358979323846
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#endif
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#define SPKR_BUF 4096
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#define SPKR_RATE 22050
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#define SPKR_VOLUME 5000
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#define SPKR_SHIFT 16
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#define SIN_ENT 1024
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#define SIN_MAX (SIN_ENT << SPKR_SHIFT)
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#define FREQ_MAX (2 << SPKR_SHIFT)
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#define FREQ_HALF (FREQ_MAX >> 1)
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struct Speaker {
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Bitu freq_add;
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Bitu freq_pos;
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Bit16s volume;
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MIXER_Channel * chan;
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bool enabled;
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bool realsound;
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bool sinewave;
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Bitu mode;
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Bit16u buffer[SPKR_BUF];
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Bit16s table[SIN_ENT];
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Bitu buf_pos;
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};
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static Speaker spkr;
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void PCSPEAKER_SetCounter(Bitu cntr,Bitu mode) {
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spkr.mode=mode;
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switch (mode) {
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case 0:
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if (cntr>72) cntr=72;
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spkr.realsound=true;
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if (spkr.buf_pos<SPKR_BUF) spkr.buffer[spkr.buf_pos++]=(cntr-36)*600;
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break;
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case 3:
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if (spkr.sinewave) {
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spkr.freq_add=(Bitu)(SIN_MAX/((float)SPKR_RATE/(PIT_TICK_RATE/(float)cntr)));
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} else {
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spkr.freq_add=(Bitu)(FREQ_MAX/((float)SPKR_RATE/(PIT_TICK_RATE/(float)cntr)));
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}
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break;
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case 4:
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spkr.freq_pos=(Bitu)(SPKR_RATE/(PIT_TICK_RATE/(float)cntr));
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}
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}
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void PCSPEAKER_Enable(bool enable) {
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spkr.enabled=enable;
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MIXER_Enable(spkr.chan,enable);
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}
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static void PCSPEAKER_CallBack(Bit8u * stream,Bit32u len) {
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switch (spkr.mode) {
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case 0:
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/* Generate the "RealSound" */
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{
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Bitu buf_add=(spkr.buf_pos<<16)/len;
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Bitu buf_pos=0;
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spkr.buf_pos=0;spkr.realsound=0;
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while (len-->0) {
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*(Bit16s*)(stream)=spkr.buffer[buf_pos >> 16];
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buf_pos+=buf_add;
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stream+=2;
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}
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break;
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}
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case 3:
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if (spkr.sinewave) while (len-->0) {
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spkr.freq_pos+=spkr.freq_add;
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spkr.freq_pos&=(SIN_MAX-1);
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*(Bit16s*)(stream)=spkr.table[spkr.freq_pos>>SPKR_SHIFT];
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stream+=2;
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} else while (len-->0) {
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spkr.freq_pos+=spkr.freq_add;
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if (spkr.freq_pos>=FREQ_MAX) spkr.freq_pos-=FREQ_MAX;
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if (spkr.freq_pos>=FREQ_HALF) {
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*(Bit16s*)(stream)=spkr.volume;
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} else {
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*(Bit16s*)(stream)=-spkr.volume;
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}
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stream+=2;
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}
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break;
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case 4:
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while (len-->0) {
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if (spkr.freq_pos) {
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*(Bit16s*)(stream)=spkr.volume;
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spkr.freq_pos--;
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} else {
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*(Bit16s*)(stream)=-spkr.volume;
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}
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stream+=2;
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}
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break;
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}
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}
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void PCSPEAKER_Init(Section* sec) {
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MSG_Add("SPEAKER_CONFIGFILE_HELP","pcspeaker related options.\n");
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Section_prop * section=static_cast<Section_prop *>(sec);
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if(!section->Get_bool("enabled")) return;
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spkr.sinewave=section->Get_bool("sinewave");
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spkr.chan=MIXER_AddChannel(&PCSPEAKER_CallBack,SPKR_RATE,"PC-SPEAKER");
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MIXER_Enable(spkr.chan,false);
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MIXER_SetMode(spkr.chan,MIXER_16MONO);
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spkr.volume=SPKR_VOLUME;
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spkr.enabled=false;
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spkr.realsound=false;
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spkr.buf_pos=0;
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/* Generate the sine wave */
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for (Bitu i=0;i<SIN_ENT;i++) {
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spkr.table[i]=(Bit16s)(sin(2*PI/SIN_ENT*i)*SPKR_VOLUME*1.5);
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}
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}
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