mirror of
https://git.code.sf.net/p/quake/quakeforge-old
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653 lines
13 KiB
C
653 lines
13 KiB
C
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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.
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See the GNU General Public License for more details.
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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 "quakedef.h"
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#include "dosisms.h"
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int BLASTER_GetDMAPos(void);
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/*
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===============================================================================
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GUS SUPPORT
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===============================================================================
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*/
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qboolean GUS_Init (void);
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int GUS_GetDMAPos (void);
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void GUS_Shutdown (void);
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/*
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===============================================================================
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BLASTER SUPPORT
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===============================================================================
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*/
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short *dma_buffer=0;
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static int dma_size;
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static int dma;
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static int dsp_port;
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static int irq;
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static int low_dma;
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static int high_dma;
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static int mixer_port;
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static int mpu401_port;
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int dsp_version;
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int dsp_minor_version;
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int timeconstant=-1;
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void PrintBits (byte b)
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{
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int i;
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char str[9];
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for (i=0 ; i<8 ; i++)
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str[i] = '0' + ((b & (1<<(7-i))) > 0);
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str[8] = 0;
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Con_Printf ("%s (%i)", str, b);
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}
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void SB_Info_f(void)
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{
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Con_Printf ("BLASTER=%s\n", getenv("BLASTER"));
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Con_Printf("dsp version=%d.%d\n", dsp_version, dsp_minor_version);
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Con_Printf("dma=%d\n", dma);
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if (timeconstant != -1)
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Con_Printf("timeconstant=%d\n", timeconstant);
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Con_Printf("dma position:%i\n", BLASTER_GetDMAPos ());
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}
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// =======================================================================
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// Interprets BLASTER variable
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// =======================================================================
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int GetBLASTER(void)
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{
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char *BLASTER;
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char *param;
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BLASTER = getenv("BLASTER");
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if (!BLASTER)
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return 0;
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param = strchr(BLASTER, 'A');
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if (!param)
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param = strchr(BLASTER, 'a');
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if (!param)
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return 0;
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sscanf(param+1, "%x", &dsp_port);
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param = strchr(BLASTER, 'I');
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if (!param)
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param = strchr(BLASTER, 'i');
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if (!param)
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return 0;
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sscanf(param+1, "%d", &irq);
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param = strchr(BLASTER, 'D');
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if (!param)
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param = strchr(BLASTER, 'd');
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if (!param)
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return 0;
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sscanf(param+1, "%d", &low_dma);
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param = strchr(BLASTER, 'H');
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if (!param)
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param = strchr(BLASTER, 'h');
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if (param)
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sscanf(param+1, "%d", &high_dma);
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param = strchr(BLASTER, 'M');
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if (!param)
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param = strchr(BLASTER, 'm');
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if (param)
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sscanf(param+1, "%x", &mixer_port);
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else
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mixer_port = dsp_port;
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param = strchr(BLASTER, 'P');
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if (!param)
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param = strchr(BLASTER, 'p');
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if (param)
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sscanf(param+1, "%x", &mpu401_port);
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return 1;
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}
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// ==================================================================
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// Resets DSP. Returns 0 on success.
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// ==================================================================
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int ResetDSP(void)
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{
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volatile int i;
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dos_outportb(dsp_port + 6, 1);
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for (i=65536 ; i ; i--) ;
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dos_outportb(dsp_port + 6, 0);
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for (i=65536 ; i ; i--)
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{
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if (!(dos_inportb(dsp_port + 0xe) & 0x80)) continue;
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if (dos_inportb(dsp_port + 0xa) == 0xaa) break;
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}
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if (i) return 0;
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else return 1;
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}
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int ReadDSP(void)
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{
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while (!(dos_inportb(dsp_port+0xe)&0x80)) ;
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return dos_inportb(dsp_port+0xa);
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}
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void WriteDSP(int val)
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{
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while ((dos_inportb(dsp_port+0xc)&0x80)) ;
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dos_outportb(dsp_port+0xc, val);
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}
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int ReadMixer(int addr)
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{
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dos_outportb(mixer_port+4, addr);
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return dos_inportb(mixer_port+5);
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}
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void WriteMixer(int addr, int val)
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{
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dos_outportb(mixer_port+4, addr);
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dos_outportb(mixer_port+5, val);
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}
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int oldmixervalue;
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/*
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================
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StartSB
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================
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*/
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void StartSB(void)
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{
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int i;
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// version 4.xx startup code
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if (dsp_version >= 4)
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{
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Con_Printf("Version 4 SB startup\n");
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WriteDSP(0xd1); // turn on speaker
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WriteDSP(0x41);
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WriteDSP(shm->speed>>8);
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WriteDSP(shm->speed&0xff);
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WriteDSP(0xb6); // 16-bit output
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WriteDSP(0x30); // stereo
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WriteDSP((shm->samples-1) & 0xff); // # of samples - 1
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WriteDSP((shm->samples-1) >> 8);
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}
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// version 3.xx startup code
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else if (dsp_version == 3)
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{
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Con_Printf("Version 3 SB startup\n");
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WriteDSP(0xd1); // turn on speaker
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oldmixervalue = ReadMixer (0xe);
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WriteMixer (0xe, oldmixervalue | 0x2);// turn on stereo
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WriteDSP(0x14); // send one byte
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WriteDSP(0x0);
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WriteDSP(0x0);
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for (i=0 ; i<0x10000 ; i++)
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dos_inportb(dsp_port+0xe); // ack the dsp
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timeconstant = 65536-(256000000/(shm->channels*shm->speed));
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WriteDSP(0x40);
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WriteDSP(timeconstant>>8);
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WriteMixer (0xe, ReadMixer(0xe) | 0x20);// turn off filter
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WriteDSP(0x48);
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WriteDSP((shm->samples-1) & 0xff); // # of samples - 1
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WriteDSP((shm->samples-1) >> 8);
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WriteDSP(0x90); // high speed 8 bit stereo
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}
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// normal speed mono
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else
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{
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Con_Printf("Version 2 SB startup\n");
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WriteDSP(0xd1); // turn on speaker
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timeconstant = 65536-(256000000/(shm->channels*shm->speed));
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WriteDSP(0x40);
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WriteDSP(timeconstant>>8);
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WriteDSP(0x48);
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WriteDSP((shm->samples-1) & 0xff); // # of samples - 1
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WriteDSP((shm->samples-1) >> 8);
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WriteDSP(0x1c); // normal speed 8 bit mono
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}
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}
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static int page_reg[] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
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static int addr_reg[] = { 0, 2, 4, 6, 0xc0, 0xc4, 0xc8, 0xcc };
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static int count_reg[] = { 1, 3, 5, 7, 0xc2, 0xc6, 0xca, 0xce };
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static int mode_reg;
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static int flipflop_reg;
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static int disable_reg;
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static int clear_reg;
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/*
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================
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StartDMA
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================
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*/
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void StartDMA(void)
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{
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int mode;
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int realaddr;
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realaddr = ptr2real(dma_buffer);
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// use a high dma channel if specified
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if (high_dma && dsp_version >= 4) // 8 bit snd can never use 16 bit dma
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dma = high_dma;
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else
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dma = low_dma;
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Con_Printf ("Using DMA channel %i\n", dma);
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if (dma > 3)
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{
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mode_reg = 0xd6;
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flipflop_reg = 0xd8;
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disable_reg = 0xd4;
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clear_reg = 0xdc;
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}
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else
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{
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mode_reg = 0xb;
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flipflop_reg = 0xc;
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disable_reg = 0xa;
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clear_reg = 0xe;
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}
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dos_outportb(disable_reg, dma|4); // disable channel
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// set mode- see "undocumented pc", p.876
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mode = (1<<6) // single-cycle
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+(0<<5) // address increment
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+(1<<4) // auto-init dma
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+(2<<2) // read
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+(dma&3); // channel #
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dos_outportb(mode_reg, mode);
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// set address
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// set page
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dos_outportb(page_reg[dma], realaddr >> 16);
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if (dma > 3)
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{ // address is in words
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dos_outportb(flipflop_reg, 0); // prepare to send 16-bit value
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dos_outportb(addr_reg[dma], (realaddr>>1) & 0xff);
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dos_outportb(addr_reg[dma], (realaddr>>9) & 0xff);
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dos_outportb(flipflop_reg, 0); // prepare to send 16-bit value
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dos_outportb(count_reg[dma], ((dma_size>>1)-1) & 0xff);
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dos_outportb(count_reg[dma], ((dma_size>>1)-1) >> 8);
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}
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else
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{ // address is in bytes
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dos_outportb(flipflop_reg, 0); // prepare to send 16-bit value
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dos_outportb(addr_reg[dma], realaddr & 0xff);
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dos_outportb(addr_reg[dma], (realaddr>>8) & 0xff);
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dos_outportb(flipflop_reg, 0); // prepare to send 16-bit value
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dos_outportb(count_reg[dma], (dma_size-1) & 0xff);
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dos_outportb(count_reg[dma], (dma_size-1) >> 8);
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}
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dos_outportb(clear_reg, 0); // clear write mask
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dos_outportb(disable_reg, dma&~4);
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}
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/*
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==================
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BLASTER_Init
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Returns false if nothing is found.
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==================
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*/
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qboolean BLASTER_Init(void)
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{
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int size;
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int realaddr;
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int rc;
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int p;
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shm = 0;
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rc = 0;
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//
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// must have a blaster variable set
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//
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if (!GetBLASTER())
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{
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Con_NotifyBox (
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"The BLASTER environment variable\n"
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"is not set, sound effects are\n"
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"disabled. See README.TXT for help.\n"
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);
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return 0;
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}
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if (ResetDSP())
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{
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Con_Printf("Could not reset SB");
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return 0;
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}
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//
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// get dsp version
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//
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WriteDSP(0xe1);
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dsp_version = ReadDSP();
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dsp_minor_version = ReadDSP();
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// we need at least v2 for auto-init dma
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if (dsp_version < 2)
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{
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Con_Printf ("Sound blaster must be at least v2.0\n");
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return 0;
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}
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// allow command line parm to set quality down
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p = COM_CheckParm ("-dsp");
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if (p && p < com_argc - 1)
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{
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p = Q_atoi (com_argv[p+1]);
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if (p < 2 || p > 4)
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Con_Printf ("-dsp parameter can only be 2, 3, or 4\n");
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else if (p > dsp_version)
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Con_Printf ("Can't -dsp %i on v%i hardware\n", p, dsp_version);
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else
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dsp_version = p;
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}
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// everyone does 11khz sampling rate unless told otherwise
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shm = &sn;
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shm->speed = 11025;
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rc = COM_CheckParm("-sspeed");
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if (rc)
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shm->speed = Q_atoi(com_argv[rc+1]);
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// version 4 cards (sb 16) do 16 bit stereo
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if (dsp_version >= 4)
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{
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shm->channels = 2;
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shm->samplebits = 16;
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}
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// version 3 cards (sb pro) do 8 bit stereo
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else if (dsp_version == 3)
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{
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shm->channels = 2;
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shm->samplebits = 8;
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}
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// v2 cards do 8 bit mono
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else
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{
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shm->channels = 1;
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shm->samplebits = 8;
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}
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Cmd_AddCommand("sbinfo", SB_Info_f);
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size = 4096;
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// allocate 8k and get a 4k-aligned buffer from it
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dma_buffer = dos_getmemory(size*2);
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if (!dma_buffer)
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{
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Con_Printf("Couldn't allocate sound dma buffer");
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return false;
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}
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realaddr = ptr2real(dma_buffer);
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realaddr = (realaddr + size) & ~(size-1);
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dma_buffer = (short *) real2ptr(realaddr);
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dma_size = size;
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memset(dma_buffer, 0, dma_size);
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shm->soundalive = true;
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shm->splitbuffer = false;
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shm->samples = size/(shm->samplebits/8);
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shm->samplepos = 0;
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shm->submission_chunk = 1;
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shm->buffer = (unsigned char *) dma_buffer;
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shm->samples = size/(shm->samplebits/8);
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StartDMA();
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StartSB();
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return true;
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}
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/*
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==============
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BLASTER_GetDMAPos
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return the current sample position (in mono samples read)
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inside the recirculating dma buffer, so the mixing code will know
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how many sample are required to fill it up.
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===============
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*/
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int BLASTER_GetDMAPos(void)
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{
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int count;
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// this function is called often. acknowledge the transfer completions
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// all the time so that it loops
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if (dsp_version >= 4)
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dos_inportb(dsp_port+0xf); // 16 bit audio
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else
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dos_inportb(dsp_port+0xe); // 8 bit audio
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// clear 16-bit reg flip-flop
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// load the current dma count register
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if (dma < 4)
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{
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dos_outportb(0xc, 0);
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count = dos_inportb(dma*2+1);
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count += dos_inportb(dma*2+1) << 8;
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if (shm->samplebits == 16)
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count /= 2;
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count = shm->samples - (count+1);
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}
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else
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{
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dos_outportb(0xd8, 0);
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count = dos_inportb(0xc0+(dma-4)*4+2);
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count += dos_inportb(0xc0+(dma-4)*4+2) << 8;
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if (shm->samplebits == 8)
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count *= 2;
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count = shm->samples - (count+1);
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}
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// Con_Printf("DMA pos = 0x%x\n", count);
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shm->samplepos = count & (shm->samples-1);
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return shm->samplepos;
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}
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/*
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==============
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BLASTER_Shutdown
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Reset the sound device for exiting
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===============
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*/
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void BLASTER_Shutdown(void)
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{
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if (dsp_version >= 4)
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{
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}
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else if (dsp_version == 3)
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{
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ResetDSP (); // stop high speed mode
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WriteMixer (0xe, oldmixervalue); // turn stereo off and filter on
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}
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else
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{
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}
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WriteDSP(0xd3); // turn off speaker
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ResetDSP ();
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dos_outportb(disable_reg, dma|4); // disable dma channel
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}
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/*
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===============================================================================
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INTERFACE
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===============================================================================
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*/
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typedef enum
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{
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dma_none,
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dma_blaster,
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dma_gus
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} dmacard_t;
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dmacard_t dmacard;
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/*
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==================
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SNDDM_Init
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Try to find a sound device to mix for.
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Returns false if nothing is found.
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Returns true and fills in the "shm" structure with information for the mixer.
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==================
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*/
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qboolean SNDDMA_Init(void)
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{
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if (GUS_Init ())
|
|
{
|
|
dmacard = dma_gus;
|
|
return true;
|
|
}
|
|
if (BLASTER_Init ())
|
|
{
|
|
dmacard = dma_blaster;
|
|
return true;
|
|
}
|
|
|
|
dmacard = dma_none;
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/*
|
|
==============
|
|
SNDDMA_GetDMAPos
|
|
|
|
return the current sample position (in mono samples, not stereo)
|
|
inside the recirculating dma buffer, so the mixing code will know
|
|
how many sample are required to fill it up.
|
|
===============
|
|
*/
|
|
int SNDDMA_GetDMAPos(void)
|
|
{
|
|
switch (dmacard)
|
|
{
|
|
case dma_blaster:
|
|
return BLASTER_GetDMAPos ();
|
|
case dma_gus:
|
|
return GUS_GetDMAPos ();
|
|
case dma_none:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
==============
|
|
SNDDMA_Shutdown
|
|
|
|
Reset the sound device for exiting
|
|
===============
|
|
*/
|
|
void SNDDMA_Shutdown(void)
|
|
{
|
|
switch (dmacard)
|
|
{
|
|
case dma_blaster:
|
|
BLASTER_Shutdown ();
|
|
break;
|
|
case dma_gus:
|
|
GUS_Shutdown ();
|
|
break;
|
|
case dma_none:
|
|
break;
|
|
}
|
|
|
|
dmacard = dma_none;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
==============
|
|
SNDDMA_Submit
|
|
|
|
Send sound to device if buffer isn't really the dma buffer
|
|
===============
|
|
*/
|
|
void SNDDMA_Submit(void)
|
|
{
|
|
}
|
|
|