ref: cd8c8d416b4245458460cfe8e3c00bcb69c3c45b
dir: /u/snd_dos.c/
/*
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "quakedef.h"
#include "dosisms.h"
int BLASTER_GetDMAPos(void);
/*
===============================================================================
GUS SUPPORT
===============================================================================
*/
qboolean GUS_Init (void);
int GUS_GetDMAPos (void);
void GUS_Shutdown (void);
/*
===============================================================================
BLASTER SUPPORT
===============================================================================
*/
short *dma_buffer=0;
static int dma_size;
static int dma;
static int dsp_port;
static int irq;
static int low_dma;
static int high_dma;
static int mixer_port;
static int mpu401_port;
int dsp_version;
int dsp_minor_version;
int timeconstant=-1;
void PrintBits (byte b)
{
int i;
char str[9];
for (i=0 ; i<8 ; i++)
str[i] = '0' + ((b & (1<<(7-i))) > 0);
str[8] = 0;
Con_Printf ("%s (%i)", str, b);
}
void SB_Info_f(void)
{
Con_Printf ("BLASTER=%s\n", getenv("BLASTER"));
Con_Printf("dsp version=%d.%d\n", dsp_version, dsp_minor_version);
Con_Printf("dma=%d\n", dma);
if (timeconstant != -1)
Con_Printf("timeconstant=%d\n", timeconstant);
Con_Printf("dma position:%i\n", BLASTER_GetDMAPos ());
}
// =======================================================================
// Interprets BLASTER variable
// =======================================================================
int GetBLASTER(void)
{
char *BLASTER;
char *param;
BLASTER = getenv("BLASTER");
if (!BLASTER)
return 0;
param = strchr(BLASTER, 'A');
if (!param)
param = strchr(BLASTER, 'a');
if (!param)
return 0;
sscanf(param+1, "%x", &dsp_port);
param = strchr(BLASTER, 'I');
if (!param)
param = strchr(BLASTER, 'i');
if (!param)
return 0;
sscanf(param+1, "%d", &irq);
param = strchr(BLASTER, 'D');
if (!param)
param = strchr(BLASTER, 'd');
if (!param)
return 0;
sscanf(param+1, "%d", &low_dma);
param = strchr(BLASTER, 'H');
if (!param)
param = strchr(BLASTER, 'h');
if (param)
sscanf(param+1, "%d", &high_dma);
param = strchr(BLASTER, 'M');
if (!param)
param = strchr(BLASTER, 'm');
if (param)
sscanf(param+1, "%x", &mixer_port);
else
mixer_port = dsp_port;
param = strchr(BLASTER, 'P');
if (!param)
param = strchr(BLASTER, 'p');
if (param)
sscanf(param+1, "%x", &mpu401_port);
return 1;
}
// ==================================================================
// Resets DSP. Returns 0 on success.
// ==================================================================
int ResetDSP(void)
{
volatile int i;
dos_outportb(dsp_port + 6, 1);
for (i=65536 ; i ; i--) ;
dos_outportb(dsp_port + 6, 0);
for (i=65536 ; i ; i--)
{
if (!(dos_inportb(dsp_port + 0xe) & 0x80)) continue;
if (dos_inportb(dsp_port + 0xa) == 0xaa) break;
}
if (i) return 0;
else return 1;
}
int ReadDSP(void)
{
while (!(dos_inportb(dsp_port+0xe)&0x80)) ;
return dos_inportb(dsp_port+0xa);
}
void WriteDSP(int val)
{
while ((dos_inportb(dsp_port+0xc)&0x80)) ;
dos_outportb(dsp_port+0xc, val);
}
int ReadMixer(int addr)
{
dos_outportb(mixer_port+4, addr);
return dos_inportb(mixer_port+5);
}
void WriteMixer(int addr, int val)
{
dos_outportb(mixer_port+4, addr);
dos_outportb(mixer_port+5, val);
}
int oldmixervalue;
/*
================
StartSB
================
*/
void StartSB(void)
{
int i;
// version 4.xx startup code
if (dsp_version >= 4)
{
Con_Printf("Version 4 SB startup\n");
WriteDSP(0xd1); // turn on speaker
WriteDSP(0x41);
WriteDSP(shm->speed>>8);
WriteDSP(shm->speed&0xff);
WriteDSP(0xb6); // 16-bit output
WriteDSP(0x30); // stereo
WriteDSP((shm->samples-1) & 0xff); // # of samples - 1
WriteDSP((shm->samples-1) >> 8);
}
// version 3.xx startup code
else if (dsp_version == 3)
{
Con_Printf("Version 3 SB startup\n");
WriteDSP(0xd1); // turn on speaker
oldmixervalue = ReadMixer (0xe);
WriteMixer (0xe, oldmixervalue | 0x2);// turn on stereo
WriteDSP(0x14); // send one byte
WriteDSP(0x0);
WriteDSP(0x0);
for (i=0 ; i<0x10000 ; i++)
dos_inportb(dsp_port+0xe); // ack the dsp
timeconstant = 65536-(256000000/(shm->channels*shm->speed));
WriteDSP(0x40);
WriteDSP(timeconstant>>8);
WriteMixer (0xe, ReadMixer(0xe) | 0x20);// turn off filter
WriteDSP(0x48);
WriteDSP((shm->samples-1) & 0xff); // # of samples - 1
WriteDSP((shm->samples-1) >> 8);
WriteDSP(0x90); // high speed 8 bit stereo
}
// normal speed mono
else
{
Con_Printf("Version 2 SB startup\n");
WriteDSP(0xd1); // turn on speaker
timeconstant = 65536-(256000000/(shm->channels*shm->speed));
WriteDSP(0x40);
WriteDSP(timeconstant>>8);
WriteDSP(0x48);
WriteDSP((shm->samples-1) & 0xff); // # of samples - 1
WriteDSP((shm->samples-1) >> 8);
WriteDSP(0x1c); // normal speed 8 bit mono
}
}
static int page_reg[] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
static int addr_reg[] = { 0, 2, 4, 6, 0xc0, 0xc4, 0xc8, 0xcc };
static int count_reg[] = { 1, 3, 5, 7, 0xc2, 0xc6, 0xca, 0xce };
static int mode_reg;
static int flipflop_reg;
static int disable_reg;
static int clear_reg;
/*
================
StartDMA
================
*/
void StartDMA(void)
{
int mode;
int realaddr;
realaddr = ptr2real(dma_buffer);
// use a high dma channel if specified
if (high_dma && dsp_version >= 4) // 8 bit snd can never use 16 bit dma
dma = high_dma;
else
dma = low_dma;
Con_Printf ("Using DMA channel %i\n", dma);
if (dma > 3)
{
mode_reg = 0xd6;
flipflop_reg = 0xd8;
disable_reg = 0xd4;
clear_reg = 0xdc;
}
else
{
mode_reg = 0xb;
flipflop_reg = 0xc;
disable_reg = 0xa;
clear_reg = 0xe;
}
dos_outportb(disable_reg, dma|4); // disable channel
// set mode- see "undocumented pc", p.876
mode = (1<<6) // single-cycle
+(0<<5) // address increment
+(1<<4) // auto-init dma
+(2<<2) // read
+(dma&3); // channel #
dos_outportb(mode_reg, mode);
// set address
// set page
dos_outportb(page_reg[dma], realaddr >> 16);
if (dma > 3)
{ // address is in words
dos_outportb(flipflop_reg, 0); // prepare to send 16-bit value
dos_outportb(addr_reg[dma], (realaddr>>1) & 0xff);
dos_outportb(addr_reg[dma], (realaddr>>9) & 0xff);
dos_outportb(flipflop_reg, 0); // prepare to send 16-bit value
dos_outportb(count_reg[dma], ((dma_size>>1)-1) & 0xff);
dos_outportb(count_reg[dma], ((dma_size>>1)-1) >> 8);
}
else
{ // address is in bytes
dos_outportb(flipflop_reg, 0); // prepare to send 16-bit value
dos_outportb(addr_reg[dma], realaddr & 0xff);
dos_outportb(addr_reg[dma], (realaddr>>8) & 0xff);
dos_outportb(flipflop_reg, 0); // prepare to send 16-bit value
dos_outportb(count_reg[dma], (dma_size-1) & 0xff);
dos_outportb(count_reg[dma], (dma_size-1) >> 8);
}
dos_outportb(clear_reg, 0); // clear write mask
dos_outportb(disable_reg, dma&~4);
}
/*
==================
BLASTER_Init
Returns false if nothing is found.
==================
*/
qboolean BLASTER_Init(void)
{
int size;
int realaddr;
int rc;
int p;
shm = 0;
rc = 0;
//
// must have a blaster variable set
//
if (!GetBLASTER())
{
Con_NotifyBox (
"The BLASTER environment variable\n"
"is not set, sound effects are\n"
"disabled. See README.TXT for help.\n"
);
return 0;
}
if (ResetDSP())
{
Con_Printf("Could not reset SB");
return 0;
}
//
// get dsp version
//
WriteDSP(0xe1);
dsp_version = ReadDSP();
dsp_minor_version = ReadDSP();
// we need at least v2 for auto-init dma
if (dsp_version < 2)
{
Con_Printf ("Sound blaster must be at least v2.0\n");
return 0;
}
// allow command line parm to set quality down
p = COM_CheckParm ("-dsp");
if (p && p < com_argc - 1)
{
p = Q_atoi (com_argv[p+1]);
if (p < 2 || p > 4)
Con_Printf ("-dsp parameter can only be 2, 3, or 4\n");
else if (p > dsp_version)
Con_Printf ("Can't -dsp %i on v%i hardware\n", p, dsp_version);
else
dsp_version = p;
}
// everyone does 11khz sampling rate unless told otherwise
shm = &sn;
shm->speed = 11025;
rc = COM_CheckParm("-sspeed");
if (rc)
shm->speed = Q_atoi(com_argv[rc+1]);
// version 4 cards (sb 16) do 16 bit stereo
if (dsp_version >= 4)
{
shm->channels = 2;
shm->samplebits = 16;
}
// version 3 cards (sb pro) do 8 bit stereo
else if (dsp_version == 3)
{
shm->channels = 2;
shm->samplebits = 8;
}
// v2 cards do 8 bit mono
else
{
shm->channels = 1;
shm->samplebits = 8;
}
Cmd_AddCommand("sbinfo", SB_Info_f);
size = 4096;
// allocate 8k and get a 4k-aligned buffer from it
dma_buffer = dos_getmemory(size*2);
if (!dma_buffer)
{
Con_Printf("Couldn't allocate sound dma buffer");
return false;
}
realaddr = ptr2real(dma_buffer);
realaddr = (realaddr + size) & ~(size-1);
dma_buffer = (short *) real2ptr(realaddr);
dma_size = size;
memset(dma_buffer, 0, dma_size);
shm->soundalive = true;
shm->splitbuffer = false;
shm->samples = size/(shm->samplebits/8);
shm->samplepos = 0;
shm->submission_chunk = 1;
shm->buffer = (unsigned char *) dma_buffer;
shm->samples = size/(shm->samplebits/8);
StartDMA();
StartSB();
return true;
}
/*
==============
BLASTER_GetDMAPos
return the current sample position (in mono samples read)
inside the recirculating dma buffer, so the mixing code will know
how many sample are required to fill it up.
===============
*/
int BLASTER_GetDMAPos(void)
{
int count;
// this function is called often. acknowledge the transfer completions
// all the time so that it loops
if (dsp_version >= 4)
dos_inportb(dsp_port+0xf); // 16 bit audio
else
dos_inportb(dsp_port+0xe); // 8 bit audio
// clear 16-bit reg flip-flop
// load the current dma count register
if (dma < 4)
{
dos_outportb(0xc, 0);
count = dos_inportb(dma*2+1);
count += dos_inportb(dma*2+1) << 8;
if (shm->samplebits == 16)
count /= 2;
count = shm->samples - (count+1);
}
else
{
dos_outportb(0xd8, 0);
count = dos_inportb(0xc0+(dma-4)*4+2);
count += dos_inportb(0xc0+(dma-4)*4+2) << 8;
if (shm->samplebits == 8)
count *= 2;
count = shm->samples - (count+1);
}
// Con_Printf("DMA pos = 0x%x\n", count);
shm->samplepos = count & (shm->samples-1);
return shm->samplepos;
}
/*
==============
BLASTER_Shutdown
Reset the sound device for exiting
===============
*/
void BLASTER_Shutdown(void)
{
if (dsp_version >= 4)
{
}
else if (dsp_version == 3)
{
ResetDSP (); // stop high speed mode
WriteMixer (0xe, oldmixervalue); // turn stereo off and filter on
}
else
{
}
WriteDSP(0xd3); // turn off speaker
ResetDSP ();
dos_outportb(disable_reg, dma|4); // disable dma channel
}
/*
===============================================================================
INTERFACE
===============================================================================
*/
typedef enum
{
dma_none,
dma_blaster,
dma_gus
} dmacard_t;
dmacard_t dmacard;
/*
==================
SNDDM_Init
Try to find a sound device to mix for.
Returns false if nothing is found.
Returns true and fills in the "shm" structure with information for the mixer.
==================
*/
qboolean SNDDMA_Init(void)
{
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)
{
}