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quakeforge/libs/audio/targets/snd_gus.c

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/*
snd_gus.c
@description@
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "dosisms.h"
//=============================================================================
// Author(s): Jayeson Lee-Steere
#define INI_STRING_SIZE 0x100
QFile *ini_fopen (const char *filename, const char *modes);
int ini_fclose (QFile *f);
void ini_fgets (QFile *f, const char *section, const char *field,
char *s);
// Routines for reading from .INI files
// The read routines are fairly efficient.
//
// Author(s): Jayeson Lee-Steere
#define MAX_SECTION_WIDTH 20
#define MAX_FIELD_WIDTH 20
#define NUM_SECTION_BUFFERS 10
#define NUM_FIELD_BUFFERS 20
struct section_buffer {
long offset;
char name[MAX_SECTION_WIDTH + 1];
};
struct field_buffer {
long offset;
int section;
char name[MAX_FIELD_WIDTH + 1];
};
static QFile *current_file = NULL;
static int current_section;
static int current_section_buffer = 0;
static int current_field_buffer = 0;
static struct section_buffer section_buffers[NUM_SECTION_BUFFERS];
static struct field_buffer field_buffers[NUM_FIELD_BUFFERS];
//***************************************************************************
// Internal routines
//***************************************************************************
static char
toupper (char c)
{
if (c >= 'a' && c <= 'z')
c -= ('a' - 'A');
return (c);
}
static void
reset_buffer (QFile *f)
{
int i;
for (i = 0; i < NUM_SECTION_BUFFERS; i++)
section_buffers[i].name[0] = 0;
for (i = 0; i < NUM_FIELD_BUFFERS; i++)
field_buffers[i].name[0] = 0;
current_file = f;
}
// Sees if the current string is section "name" (i.e. ["name"]).
// If "name"=="*", sees if the current string is any section
// (i.e. [....]). Returns 1 if true else 0 if false.
static int
is_section (char *s, const char *name)
{
int wild = 0;
// See if wild search
if (strcmp ("*", name) == 0)
wild = 1;
// Skip leading spaces
while (s[0] == ' ')
s++;
// Look for leading "["
if (s[0] != '[')
return (0);
s++;
// Make sure name matches
while (s[0] != ']' && s[0] != 13 && s[0] != 10 && s[0] != 0 && name[0] != 0) {
if (!wild)
if (toupper (s[0]) != toupper (name[0]))
return (0);
s++;
if (!wild)
name++;
}
if (!wild)
if (name[0] != 0)
return (0);
// Skip trailing spaces
while (s[0] == ' ')
s++;
// Make sure we have trailing "]"
if (s[0] != ']')
return (0);
return (1);
}
// Sees if the current string is field "name" (i.e. "name"=...).
// If "name"=="*", sees if the current string is any field
// (i.e. ...=...). Returns 1 if true else 0 if false.
static int
is_field (char *s, const char *name)
{
int wild = 0;
// See if wild search
if (strcmp ("*", name) == 0)
wild = 1;
// Skip leading spaces
while (s[0] == ' ')
s++;
// Make sure name matches
while (s[0] != '=' && s[0] != 13 && s[0] != 10 && s[0] != 0 && name[0] != 0) {
if (!wild)
if (toupper (s[0]) != toupper (name[0]))
return (0);
s++;
if (!wild)
name++;
}
if (!wild)
if (name[0] != 0)
return (0);
// Skip trailing spaces
while (s[0] == ' ')
s++;
// Make sure we have an "="
if (s[0] != '=')
return (0);
return (1);
}
// Extracts the section name from a section heading
// e.g. in="[hey man]" gives out="hey man"
static void
get_section_name (char *out, char *in)
{
int i = 0;
// Skip spaces before '['
while (in[0] == ' ')
in++;
// Make sure there is a '['
if (in[0] != '[') {
out[0] = 0;
return;
}
// Skip past '['
in++;
// Copy string if any to output string.
while (in[0] != ']' && in[0] != 13 && in[0] != 10 && in[0] != 0) {
if (i < MAX_SECTION_WIDTH) {
out[i] = in[0];
i++;
}
in++;
}
// Make sure string was terminated with ']'
if (in[0] != ']') {
out[0] = 0;
return;
}
// Remove trailing spaces
while (i > 0 && out[i - 1] == ' ')
i--;
// Null terminate the output string.
out[i] = 0;
}
// Extracts the field name from a field line
// e.g. in="sooty=life be in it" gives out="sooty"
static void
get_field_name (char *out, char *in)
{
int i = 0;
// Skip leading spaces
while (in[0] == ' ')
in++;
// Copy name to output string
while (in[0] != '=' && in[0] != 13 && in[0] != 10 && in[0] != 0) {
if (i < MAX_FIELD_WIDTH) {
out[i] = in[0];
i++;
}
in++;
}
// Make sure we stopped on "="
if (in[0] != '=') {
out[0] = 0;
return;
}
// Remove trailing spaces
while (i > 0 && out[i - 1] == ' ')
i--;
// Null terminate the output string.
out[i] = 0;
}
// Returns the field data from string s.
// e.g. in="wally = golly man" gives out="golly man"
static void
get_field_string (char *out, char *in)
{
int i = 0;
// Find '=' if it exists
while (in[0] != '=' && in[0] != 13 && in[0] != 10 && in[0] != 0)
in++;
// If there is an '=', skip past it.
if (in[0] == '=')
in++;
// Skip any spaces between the '=' and string.
while (in[0] == ' ' || in[0] == '[')
in++;
// Copy string, if there is one, to the output string.
while (in[0] != 13 && in[0] != 10 && in[0] != 0
&& i < (INI_STRING_SIZE - 1)) {
out[i] = in[0];
in++;
i++;
}
// Null terminate the output string.
out[i] = 0;
}
// Adds a section to the buffer
static int
add_section (char *instring, long offset)
{
int i;
char section[MAX_SECTION_WIDTH + 1];
// Extract section name
get_section_name (section, instring);
// See if section already exists.
for (i = 0; i < NUM_SECTION_BUFFERS; i++)
if (strcasecmp (section, section_buffers[i].name) == 0)
return (i);
// Increment current_section_buffer
current_section_buffer++;
if (current_section_buffer > NUM_SECTION_BUFFERS)
current_section_buffer = 0;
// Delete any field buffers that correspond to this section
for (i = 0; i < NUM_FIELD_BUFFERS; i++)
if (field_buffers[i].section == current_section_buffer)
field_buffers[i].name[0] = 0;
// Set buffer information
strcpy (section_buffers[current_section_buffer].name, section);
section_buffers[current_section_buffer].offset = offset;
return (current_section_buffer);
}
// Adds a field to the buffer
static void
add_field (char *instring, int section, long offset)
{
int i;
char field[MAX_FIELD_WIDTH + 1];
// Extract field name
get_field_name (field, instring);
// See if field already exists
for (i = 0; i < NUM_FIELD_BUFFERS; i++)
if (field_buffers[i].section == section)
if (strcasecmp (field_buffers[i].name, field) == 0)
return;
// Increment current_field_buffer
current_field_buffer++;
if (current_field_buffer > NUM_FIELD_BUFFERS)
current_field_buffer = 0;
// Set buffer information
strcpy (field_buffers[current_field_buffer].name, field);
field_buffers[current_field_buffer].section = section;
field_buffers[current_field_buffer].offset = offset;
}
// Identical to fgets except the string is trucated at the first ';',
// carriage return or line feed.
static char *
stripped_fgets (char *s, int n, QFile *f)
{
int i = 0;
if (fgets (s, n, f) == NULL)
return (NULL);
while (s[i] != ';' && s[i] != 13 && s[i] != 10 && s[i] != 0)
i++;
s[i] = 0;
return (s);
}
//***************************************************************************
// Externally accessable routines
//***************************************************************************
// Opens an .INI file. Works like fopen
QFile *
ini_fopen (const char *filename, const char *modes)
{
return (Qopen (filename, modes));
}
// Closes a .INI file. Works like fclose
int
ini_fclose (QFile *f)
{
if (f == current_file)
reset_buffer (NULL);
return (Qclose (f));
}
// Puts "field" from "section" from .ini file "f" into "s".
// If "section" does not exist or "field" does not exist in
// section then s="";
void
ini_fgets (QFile *f, const char *section, const char *field, char *s)
{
int i;
long start_pos, string_start_pos;
char ts[INI_STRING_SIZE * 2];
if (f != current_file)
reset_buffer (f);
// Default to "Not found"
s[0] = 0;
// See if section is in buffer
for (i = 0; i < NUM_SECTION_BUFFERS; i++)
if (strnicmp (section_buffers[i].name, section, MAX_SECTION_WIDTH) == 0)
break;
// If section is in buffer, seek to it if necessary
if (i < NUM_SECTION_BUFFERS) {
if (i != current_section) {
current_section = i;
fseek (f, section_buffers[i].offset, SEEK_SET);
}
}
// else look through .ini file for it.
else {
// Make sure we are not at eof or this will cause trouble.
if (feof (f))
rewind (f);
start_pos = ftell (f);
while (1) {
stripped_fgets (ts, INI_STRING_SIZE * 2, f);
// If it is a section, add it to the section buffer
if (is_section (ts, "*"))
current_section = add_section (ts, ftell (f));
// If it is the section we are looking for, break.
if (is_section (ts, section))
break;
// If we reach the end of the file, rewind to the start.
if (feof (f))
rewind (f);
if (ftell (f) == start_pos)
return;
}
}
// See if field is in buffer
for (i = 0; i < NUM_FIELD_BUFFERS; i++)
if (field_buffers[i].section == current_section)
if (strnicmp (field_buffers[i].name, field, MAX_FIELD_WIDTH) == 0)
break;
// If field is in buffer, seek to it and read it
if (i < NUM_FIELD_BUFFERS) {
fseek (f, field_buffers[i].offset, SEEK_SET);
stripped_fgets (ts, INI_STRING_SIZE * 2, f);
get_field_string (s, ts);
} else
// else search through section for field.
{
// Make sure we do not start at eof or this will cause problems.
if (feof (f))
fseek (f, section_buffers[current_section].offset, SEEK_SET);
start_pos = ftell (f);
while (1) {
string_start_pos = ftell (f);
stripped_fgets (ts, INI_STRING_SIZE * 2, f);
// If it is a field, add it to the buffer
if (is_field (ts, "*"))
add_field (ts, current_section, string_start_pos);
// If it is the field we are looking for, save it
if (is_field (ts, field)) {
get_field_string (s, ts);
break;
}
// If we reach the end of the section, start over
if (feof (f) || is_section (ts, "*"))
fseek (f, section_buffers[current_section].offset, SEEK_SET);
if (ftell (f) == start_pos)
return;
}
}
}
//=============================================================================
#define BYTE unsigned char
#define WORD unsigned short
#define DWORD unsigned long
#define BUFFER_SIZE 4096
#define CODEC_ADC_INPUT_CONTROL_LEFT 0x00
#define CODEC_ADC_INPUT_CONTROL_RIGHT 0x01
#define CODEC_AUX1_INPUT_CONTROL_LEFT 0x02
#define CODEC_AUX1_INPUT_CONTROL_RIGHT 0x03
#define CODEC_AUX2_INPUT_CONTROL_LEFT 0x04
#define CODEC_AUX2_INPUT_CONTROL_RIGHT 0x05
#define CODEC_DAC_OUTPUT_CONTROL_LEFT 0x06
#define CODEC_DAC_OUTPUT_CONTROL_RIGHT 0x07
#define CODEC_FS_FORMAT 0x08
#define CODEC_INTERFACE_CONFIG 0x09
#define CODEC_PIN_CONTROL 0x0A
#define CODEC_ERROR_STATUS_AND_INIT 0x0B
#define CODEC_MODE_AND_ID 0x0C
#define CODEC_LOOPBACK_CONTROL 0x0D
#define CODEC_PLAYBACK_UPPER_BASE_COUNT 0x0E
#define CODEC_PLAYBACK_LOWER_BASE_COUNT 0x0F
#define SET_CONTROL 0x00
#define SET_FREQUENCY 0x01
#define SET_START_HIGH 0x02
#define SET_START_LOW 0x03
#define SET_END_HIGH 0x04
#define SET_END_LOW 0x05
#define SET_VOLUME_RATE 0x06
#define SET_VOLUME_START 0x07
#define SET_VOLUME_END 0x08
#define SET_CURR_VOLUME 0x09
#define SET_VOLUME 0x09
#define SET_ACC_HIGH 0x0A
#define SET_ACC_LOW 0x0B
#define SET_BALANCE 0x0C
#define SET_VOLUME_CONTROL 0x0D
#define SET_VOICES 0x0E
#define DMA_CONTROL 0x41
#define SET_DMA_ADDRESS 0x42
#define SET_DRAM_LOW 0x43
#define SET_DRAM_HIGH 0x44
#define ADLIB_CONTROL 0x45
#define ADLIB_TIMER1 0x46
#define ADLIB_TIMER2 0x47
#define SET_RECORD_RATE 0x48
#define RECORD_CONTROL 0x49
#define SET_JOYSTICK 0x4B
#define MASTER_RESET 0x4C
#define GET_CONTROL 0x80
#define GET_FREQUENCY 0x81
#define GET_START_HIGH 0x82
#define GET_START_LOW 0x83
#define GET_END_HIGH 0x84
#define GET_END_LOW 0x85
#define GET_VOLUME_RATE 0x86
#define GET_VOLUME_START 0x87
#define GET_VOLUME_END 0x88
#define GET_VOLUME 0x89
#define GET_ACC_HIGH 0x8A
#define GET_ACC_LOW 0x8B
#define GET_BALANCE 0x8C
#define GET_VOLUME_CONTROL 0x8D
#define GET_VOICES 0x8E
#define GET_IRQV 0x8F
struct CodecRateStruct {
WORD Rate;
BYTE FSVal;
};
struct Gf1RateStruct {
WORD Rate;
BYTE Voices;
};
//=============================================================================
// Reference variables in SND_DOS.C
//=============================================================================
extern short *dma_buffer;
//=============================================================================
// GUS-only variables
//=============================================================================
static BYTE HaveCodec = 0;
static WORD CodecRegisterSelect;
static WORD CodecData;
static WORD CodecStatus;
static WORD Gf1TimerControl;
static WORD Gf1PageRegister;
static WORD Gf1RegisterSelect;
static WORD Gf1DataLow;
static WORD Gf1DataHigh;
static BYTE DmaChannel;
static BYTE PageRegs[] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
static BYTE AddrRegs[] = { 0, 2, 4, 6, 0xc0, 0xc4, 0xc8, 0xcc };
static BYTE CountRegs[] = { 1, 3, 5, 7, 0xc2, 0xc6, 0xca, 0xce };
static WORD AddrReg;
static WORD CountReg;
static WORD ModeReg;
static WORD DisableReg;
static WORD ClearReg;
static struct CodecRateStruct CodecRates[] = {
{5512, 0x01},
{6620, 0x0F},
{8000, 0x00},
{9600, 0x0E},
{11025, 0x03},
{16000, 0x02},
{18900, 0x05},
{22050, 0x07},
{27420, 0x04},
{32000, 0x06},
{33075, 0x0D},
{37800, 0x09},
{44100, 0x0B},
{48000, 0x0C},
{0, 0x00} // End marker
};
static struct Gf1RateStruct Gf1Rates[] = {
{19293, 32},
{19916, 31},
{20580, 30},
{21289, 29},
{22050, 28},
{22866, 27},
{23746, 26},
{24696, 25},
{25725, 24},
{26843, 23},
{28063, 22},
{29400, 21},
{30870, 20},
{32494, 19},
{34300, 18},
{36317, 17},
{38587, 16},
{41160, 15},
{44100, 14},
{0, 0}
};
//=============================================================================
// Basic GF1 functions
//=============================================================================
void
SetGf18 (BYTE reg, BYTE data)
{
dos_outportb (Gf1RegisterSelect, reg);
dos_outportb (Gf1DataHigh, data);
}
void
SetGf116 (BYTE reg, WORD data)
{
dos_outportb (Gf1RegisterSelect, reg);
dos_outportw (Gf1DataLow, data);
}
BYTE
GetGf18 (BYTE reg)
{
dos_outportb (Gf1RegisterSelect, reg);
return (dos_inportb (Gf1DataHigh));
}
WORD
GetGf116 (BYTE reg)
{
dos_outportb (Gf1RegisterSelect, reg);
return (dos_inportw (Gf1DataLow));
}
void
Gf1Delay (void)
{
int i;
for (i = 0; i < 27; i++)
dos_inportb (Gf1TimerControl);
}
DWORD
ConvertTo16 (DWORD Address)
{
return (((Address >> 1) & 0x0001FFFF) | (Address & 0x000C0000L));
}
void
ClearGf1Ints (void)
{
int i;
SetGf18 (DMA_CONTROL, 0x00);
SetGf18 (ADLIB_CONTROL, 0x00);
SetGf18 (RECORD_CONTROL, 0x00);
GetGf18 (DMA_CONTROL);
GetGf18 (RECORD_CONTROL);
for (i = 0; i < 32; i++);
GetGf18 (GET_IRQV);
}
//=============================================================================
// Get Interwave (UltraSound PnP) configuration if any
//=============================================================================
static qboolean
GUS_GetIWData (void)
{
char *Interwave, s[INI_STRING_SIZE];
QFile *IwFile;
int CodecBase, CodecDma, i;
Interwave = getenv ("INTERWAVE");
if (Interwave == NULL)
return (false);
// Open IW.INI
IwFile = ini_fopen (Interwave, "rt");
if (IwFile == NULL)
return (false);
// Read codec base and codec DMA
ini_fgets (IwFile, "setup 0", "CodecBase", s);
sscanf (s, "%X", &CodecBase);
ini_fgets (IwFile, "setup 0", "DMA2", s);
sscanf (s, "%i", &CodecDma);
ini_fclose (IwFile);
// Make sure numbers OK
if (CodecBase == 0 || CodecDma == 0)
return (false);
CodecRegisterSelect = CodecBase;
CodecData = CodecBase + 1;
CodecStatus = CodecBase + 2;
DmaChannel = CodecDma;
// Make sure there is a CODEC at the CODEC base
// Clear any pending IRQs
dos_inportb (CodecStatus);
dos_outportb (CodecStatus, 0);
// Wait for 'INIT' bit to clear
for (i = 0; i < 0xFFFF; i++)
if ((dos_inportb (CodecRegisterSelect) & 0x80) == 0)
break;
if (i == 0xFFFF)
return (false);
// Get chip revision - can not be zero
dos_outportb (CodecRegisterSelect, CODEC_MODE_AND_ID);
if ((dos_inportb (CodecRegisterSelect) & 0x7F) != CODEC_MODE_AND_ID)
return (false);
if ((dos_inportb (CodecData) & 0x0F) == 0)
return (false);
HaveCodec = 1;
Con_Printf ("Sound Card is UltraSound PnP\n");
return (true);
}
//=============================================================================
// Get UltraSound MAX configuration if any
//=============================================================================
static qboolean
GUS_GetMAXData (void)
{
char *Ultrasnd, *Ultra16;
int i;
int GusBase, Dma1, Dma2, Irq1, Irq2;
int CodecBase, CodecDma, CodecIrq, CodecType;
BYTE MaxVal;
Ultrasnd = getenv ("ULTRASND");
Ultra16 = getenv ("ULTRA16");
if (Ultrasnd == NULL || Ultra16 == NULL)
return (false);
sscanf (Ultrasnd, "%x,%i,%i,%i,%i", &GusBase, &Dma1, &Dma2, &Irq1, &Irq2);
sscanf (Ultra16, "%x,%i,%i,%i", &CodecBase, &CodecDma, &CodecIrq,
&CodecType);
if (CodecType == 0 && CodecDma != 0)
DmaChannel = CodecDma & 0x07;
else
DmaChannel = Dma2 & 0x07;
// Make sure there is a GUS at GUS base
dos_outportb (GusBase + 0x08, 0x55);
if (dos_inportb (GusBase + 0x0A) != 0x55)
return (false);
dos_outportb (GusBase + 0x08, 0xAA);
if (dos_inportb (GusBase + 0x0A) != 0xAA)
return (false);
// Program CODEC control register
MaxVal = ((CodecBase & 0xF0) >> 4) | 0x40;
if (Dma1 > 3)
MaxVal |= 0x10;
if (Dma2 > 3)
MaxVal |= 0x20;
dos_outportb (GusBase + 0x106, MaxVal);
CodecRegisterSelect = CodecBase;
CodecData = CodecBase + 1;
CodecStatus = CodecBase + 2;
// Make sure there is a CODEC at the CODEC base
// Clear any pending IRQs
dos_inportb (CodecStatus);
dos_outportb (CodecStatus, 0);
// Wait for 'INIT' bit to clear
for (i = 0; i < 0xFFFF; i++)
if ((dos_inportb (CodecRegisterSelect) & 0x80) == 0)
break;
if (i == 0xFFFF)
return (false);
// Get chip revision - can not be zero
dos_outportb (CodecRegisterSelect, CODEC_MODE_AND_ID);
if ((dos_inportb (CodecRegisterSelect) & 0x7F) != CODEC_MODE_AND_ID)
return (false);
if ((dos_inportb (CodecData) & 0x0F) == 0)
return (false);
HaveCodec = 1;
Con_Printf ("Sound Card is UltraSound MAX\n");
return (true);
}
//=============================================================================
// Get regular UltraSound configuration if any
//=============================================================================
static qboolean
GUS_GetGUSData (void)
{
char *Ultrasnd;
int GusBase, Dma1, Dma2, Irq1, Irq2, i;
Ultrasnd = getenv ("ULTRASND");
if (Ultrasnd == NULL)
return (false);
sscanf (Ultrasnd, "%x,%i,%i,%i,%i", &GusBase, &Dma1, &Dma2, &Irq1, &Irq2);
DmaChannel = Dma1 & 0x07;
// Make sure there is a GUS at GUS base
dos_outportb (GusBase + 0x08, 0x55);
if (dos_inportb (GusBase + 0x0A) != 0x55)
return (false);
dos_outportb (GusBase + 0x08, 0xAA);
if (dos_inportb (GusBase + 0x0A) != 0xAA)
return (false);
Gf1TimerControl = GusBase + 0x008;
Gf1PageRegister = GusBase + 0x102;
Gf1RegisterSelect = GusBase + 0x103;
Gf1DataLow = GusBase + 0x104;
Gf1DataHigh = GusBase + 0x105;
// Reset the GUS
SetGf18 (MASTER_RESET, 0x00);
Gf1Delay ();
Gf1Delay ();
SetGf18 (MASTER_RESET, 0x01);
Gf1Delay ();
Gf1Delay ();
// Set to max (32) voices
SetGf18 (SET_VOICES, 0xDF);
// Clear any pending IRQ's
ClearGf1Ints ();
// Set all registers to known values
for (i = 0; i < 32; i++) {
dos_outportb (Gf1PageRegister, i);
SetGf18 (SET_CONTROL, 0x03);
SetGf18 (SET_VOLUME_CONTROL, 0x03);
Gf1Delay ();
SetGf18 (SET_CONTROL, 0x03);
SetGf18 (SET_VOLUME_CONTROL, 0x03);
SetGf116 (SET_START_HIGH, 0);
SetGf116 (SET_START_LOW, 0);
SetGf116 (SET_END_HIGH, 0);
SetGf116 (SET_END_LOW, 0);
SetGf116 (SET_ACC_HIGH, 0);
SetGf116 (SET_ACC_LOW, 0);
SetGf18 (SET_VOLUME_RATE, 63);
SetGf18 (SET_VOLUME_START, 5);
SetGf18 (SET_VOLUME_END, 251);
SetGf116 (SET_VOLUME, 5 << 8);
}
// Clear any pending IRQ's
ClearGf1Ints ();
// Enable DAC etc.
SetGf18 (MASTER_RESET, 0x07);
// Enable line output so we can hear something
dos_outportb (GusBase, 0x08);
HaveCodec = 0;
Con_Printf ("Sound Card is UltraSound\n");
return (true);
}
//=============================================================================
// Programs the DMA controller to start DMAing in Auto-init mode
//=============================================================================
static void
GUS_StartDMA (BYTE DmaChannel, short *dma_buffer, int count)
{
int mode;
int RealAddr;
RealAddr = ptr2real (dma_buffer);
if (DmaChannel <= 3) {
ModeReg = 0x0B;
DisableReg = 0x0A;
ClearReg = 0x0E;
} else {
ModeReg = 0xD6;
DisableReg = 0xD4;
ClearReg = 0xDC;
}
CountReg = CountRegs[DmaChannel];
AddrReg = AddrRegs[DmaChannel];
dos_outportb (DisableReg, DmaChannel | 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
+ (DmaChannel & 0x03); // channel #
dos_outportb (ModeReg, mode);
// set page
dos_outportb (PageRegs[DmaChannel], RealAddr >> 16);
if (DmaChannel <= 3) { // address is in bytes
dos_outportb (0x0C, 0); // prepare to send 16-bit value
dos_outportb (AddrReg, RealAddr & 0xff);
dos_outportb (AddrReg, (RealAddr >> 8) & 0xff);
dos_outportb (0x0C, 0); // prepare to send 16-bit value
dos_outportb (CountReg, (count - 1) & 0xff);
dos_outportb (CountReg, (count - 1) >> 8);
} else { // address is in words
dos_outportb (0xD8, 0); // prepare to send 16-bit value
dos_outportb (AddrReg, (RealAddr >> 1) & 0xff);
dos_outportb (AddrReg, (RealAddr >> 9) & 0xff);
dos_outportb (0xD8, 0); // prepare to send 16-bit value
dos_outportb (CountReg, ((count >> 1) - 1) & 0xff);
dos_outportb (CountReg, ((count >> 1) - 1) >> 8);
}
dos_outportb (ClearReg, 0); // clear write mask
dos_outportb (DisableReg, DmaChannel & ~4);
}
//=============================================================================
// Starts the CODEC playing
//=============================================================================
static void
GUS_StartCODEC (int count, BYTE FSVal)
{
int i, j;
// Clear any pending IRQs
dos_inportb (CodecStatus);
dos_outportb (CodecStatus, 0);
// Set mode to 2
dos_outportb (CodecRegisterSelect, CODEC_MODE_AND_ID);
dos_outportb (CodecData, 0xC0);
// Stop any playback or capture which may be happening
dos_outportb (CodecRegisterSelect, CODEC_INTERFACE_CONFIG);
dos_outportb (CodecData, dos_inportb (CodecData) & 0xFC);
// Set FS
dos_outportb (CodecRegisterSelect, CODEC_FS_FORMAT | 0x40);
dos_outportb (CodecData, FSVal | 0x50); // Or in stereo and 16 bit bits
// Wait a bit
for (i = 0; i < 10; i++)
dos_inportb (CodecData);
// Routine 1 to counter CODEC bug - wait for init bit to clear and then a
// bit longer (i=min loop count, j=timeout
for (i = 0, j = 0; i < 1000 && j < 0x7FFFF; j++)
if ((dos_inportb (CodecRegisterSelect) & 0x80) == 0)
i++;
// Routine 2 to counter CODEC bug - this is from Forte's code. For me it
// does not seem to cure the problem, but is added security
// Waits till we can modify index register
for (j = 0; j < 0x7FFFF; j++) {
dos_outportb (CodecRegisterSelect, CODEC_INTERFACE_CONFIG | 0x40);
if (dos_inportb (CodecRegisterSelect) ==
(CODEC_INTERFACE_CONFIG | 0x40)) break;
}
// Perform ACAL
dos_outportb (CodecRegisterSelect, CODEC_INTERFACE_CONFIG | 0x40);
dos_outportb (CodecData, 0x08);
// Clear MCE bit - this makes ACAL happen
dos_outportb (CodecRegisterSelect, CODEC_INTERFACE_CONFIG);
// Wait for ACAL to finish
for (j = 0; j < 0x7FFFF; j++) {
if ((dos_inportb (CodecRegisterSelect) & 0x80) != 0)
continue;
dos_outportb (CodecRegisterSelect, CODEC_ERROR_STATUS_AND_INIT);
if ((dos_inportb (CodecData) & 0x20) == 0)
break;
}
// Clear ACAL bit
dos_outportb (CodecRegisterSelect, CODEC_INTERFACE_CONFIG | 0x40);
dos_outportb (CodecData, 0x00);
dos_outportb (CodecRegisterSelect, CODEC_INTERFACE_CONFIG);
// Set some other junk
dos_outportb (CodecRegisterSelect, CODEC_LOOPBACK_CONTROL);
dos_outportb (CodecData, 0x00);
dos_outportb (CodecRegisterSelect, CODEC_PIN_CONTROL);
dos_outportb (CodecData, 0x08); // IRQ is disabled in PIN control
// Set count (it doesn't really matter what value we stuff in here
dos_outportb (CodecRegisterSelect, CODEC_PLAYBACK_LOWER_BASE_COUNT);
dos_outportb (CodecData, count & 0xFF);
dos_outportb (CodecRegisterSelect, CODEC_PLAYBACK_UPPER_BASE_COUNT);
dos_outportb (CodecData, count >> 8);
// Start playback
dos_outportb (CodecRegisterSelect, CODEC_INTERFACE_CONFIG);
dos_outportb (CodecData, 0x01);
}
//=============================================================================
// Starts the GF1 playing
//=============================================================================
static void
GUS_StartGf1 (int count, BYTE Voices)
{
DWORD StartAddressL, EndAddressL, StartAddressR, EndAddressR;
// Set number of voices to give us the sampling rate we want
SetGf18 (SET_VOICES, 0xC0 | (Voices - 1));
// Figure out addresses
StartAddressL = ConvertTo16 (0);
EndAddressL = ConvertTo16 (count - 2 - 2);
StartAddressR = ConvertTo16 (2);
EndAddressR = ConvertTo16 (count - 2);
// Set left voice addresses
dos_outportb (Gf1PageRegister, 0);
SetGf116 (SET_START_LOW, StartAddressL << 9);
SetGf116 (SET_START_HIGH, StartAddressL >> 7);
SetGf116 (SET_ACC_LOW, StartAddressL << 9);
SetGf116 (SET_ACC_HIGH, StartAddressL >> 7);
SetGf116 (SET_END_LOW, EndAddressL << 9);
SetGf116 (SET_END_HIGH, EndAddressL >> 7);
// Set balance to full left
SetGf18 (SET_BALANCE, 0);
// Set volume to full
SetGf116 (SET_VOLUME, 0xFFF0);
// Set FC to 2 (so we play every second sample)
SetGf116 (SET_FREQUENCY, 0x0800);
// Set right voice addresses
dos_outportb (Gf1PageRegister, 1);
SetGf116 (SET_START_LOW, StartAddressR << 9);
SetGf116 (SET_START_HIGH, StartAddressR >> 7);
SetGf116 (SET_ACC_LOW, StartAddressR << 9);
SetGf116 (SET_ACC_HIGH, StartAddressR >> 7);
SetGf116 (SET_END_LOW, EndAddressR << 9);
SetGf116 (SET_END_HIGH, EndAddressR >> 7);
// Set balance to full right
SetGf18 (SET_BALANCE, 15);
// Set volume to full
SetGf116 (SET_VOLUME, 0xFFF0);
// Set FC to 2 (so we play every second sample)
SetGf116 (SET_FREQUENCY, 0x0800);
// Start voices
dos_outportb (Gf1PageRegister, 0);
SetGf18 (SET_CONTROL, 0x0C);
dos_outportb (Gf1PageRegister, 1);
SetGf18 (SET_CONTROL, 0x0C);
Gf1Delay ();
dos_outportb (Gf1PageRegister, 0);
SetGf18 (SET_CONTROL, 0x0C);
dos_outportb (Gf1PageRegister, 1);
SetGf18 (SET_CONTROL, 0x0C);
}
//=============================================================================
// Figures out what kind of UltraSound we have, if any, and starts it playing
//=============================================================================
qboolean
GUS_Init (void)
{
int rc;
int RealAddr;
BYTE FSVal, Voices;
struct CodecRateStruct *CodecRate;
struct Gf1RateStruct *Gf1Rate;
// See what kind of UltraSound we have, if any
if (GUS_GetIWData () == false)
if (GUS_GetMAXData () == false)
if (GUS_GetGUSData () == false)
return (false);
shm = &sn;
if (HaveCodec) {
// do 11khz sampling rate unless command line parameter wants
// different
shm->speed = 11025;
FSVal = 0x03;
rc = COM_CheckParm ("-sspeed");
if (rc) {
shm->speed = Q_atoi (com_argv[rc + 1]);
// Make sure rate not too high
if (shm->speed > 48000)
shm->speed = 48000;
// Adjust speed to match one of the possible CODEC rates
for (CodecRate = CodecRates; CodecRate->Rate != 0; CodecRate++) {
if (shm->speed <= CodecRate->Rate) {
shm->speed = CodecRate->Rate;
FSVal = CodecRate->FSVal;
break;
}
}
}
// Always do 16 bit stereo
shm->channels = 2;
shm->samplebits = 16;
// allocate buffer twice the size we need so we can get aligned
// buffer
dma_buffer = dos_getmemory (BUFFER_SIZE * 2);
if (dma_buffer == NULL) {
Con_Printf ("Couldn't allocate sound dma buffer");
return false;
}
RealAddr = ptr2real (dma_buffer);
RealAddr = (RealAddr + BUFFER_SIZE) & ~(BUFFER_SIZE - 1);
dma_buffer = (short *) real2ptr (RealAddr);
// Zero off DMA buffer
memset (dma_buffer, 0, BUFFER_SIZE);
shm->soundalive = true;
shm->splitbuffer = false;
shm->samplepos = 0;
shm->submission_chunk = 1;
shm->buffer = (unsigned char *) dma_buffer;
shm->samples = BUFFER_SIZE / (shm->samplebits / 8);
GUS_StartDMA (DmaChannel, dma_buffer, BUFFER_SIZE);
GUS_StartCODEC (BUFFER_SIZE, FSVal);
} else {
// do 19khz sampling rate unless command line parameter wants
// different
shm->speed = 19293;
Voices = 32;
rc = COM_CheckParm ("-sspeed");
if (rc) {
shm->speed = Q_atoi (com_argv[rc + 1]);
// Make sure rate not too high
if (shm->speed > 44100)
shm->speed = 44100;
// Adjust speed to match one of the possible GF1 rates
for (Gf1Rate = Gf1Rates; Gf1Rate->Rate != 0; Gf1Rate++) {
if (shm->speed <= Gf1Rate->Rate) {
shm->speed = Gf1Rate->Rate;
Voices = Gf1Rate->Voices;
break;
}
}
}
// Always do 16 bit stereo
shm->channels = 2;
shm->samplebits = 16;
// allocate buffer twice the size we need so we can get aligned
// buffer
dma_buffer = dos_getmemory (BUFFER_SIZE * 2);
if (dma_buffer == NULL) {
Con_Printf ("Couldn't allocate sound dma buffer");
return false;
}
RealAddr = ptr2real (dma_buffer);
RealAddr = (RealAddr + BUFFER_SIZE) & ~(BUFFER_SIZE - 1);
dma_buffer = (short *) real2ptr (RealAddr);
// Zero off DMA buffer
memset (dma_buffer, 0, BUFFER_SIZE);
shm->soundalive = true;
shm->splitbuffer = false;
shm->samplepos = 0;
shm->submission_chunk = 1;
shm->buffer = (unsigned char *) dma_buffer;
shm->samples = BUFFER_SIZE / (shm->samplebits / 8);
GUS_StartDMA (DmaChannel, dma_buffer, BUFFER_SIZE);
SetGf116 (SET_DMA_ADDRESS, 0x0000);
if (DmaChannel <= 3)
SetGf18 (DMA_CONTROL, 0x41);
else
SetGf18 (DMA_CONTROL, 0x45);
GUS_StartGf1 (BUFFER_SIZE, Voices);
}
return (true);
}
//=============================================================================
// Returns the current playback position
//=============================================================================
int
GUS_GetDMAPos (void)
{
int count;
if (HaveCodec) {
// clear 16-bit reg flip-flop
// load the current dma count register
if (DmaChannel < 4) {
dos_outportb (0x0C, 0);
count = dos_inportb (CountReg);
count += dos_inportb (CountReg) << 8;
if (shm->samplebits == 16)
count /= 2;
count = shm->samples - (count + 1);
} else {
dos_outportb (0xD8, 0);
count = dos_inportb (CountReg);
count += dos_inportb (CountReg) << 8;
if (shm->samplebits == 8)
count *= 2;
count = shm->samples - (count + 1);
}
} else {
// Read current position from GF1
dos_outportb (Gf1PageRegister, 0);
count = (GetGf116 (GET_ACC_HIGH) << 7) & 0xFFFF;
// See which half of buffer we are in. Note that since this is 16 bit
// data we are playing, position is in 16 bit samples
if (GetGf18 (DMA_CONTROL) & 0x40) {
GUS_StartDMA (DmaChannel, dma_buffer, BUFFER_SIZE);
SetGf116 (SET_DMA_ADDRESS, 0x0000);
if (DmaChannel <= 3)
SetGf18 (DMA_CONTROL, 0x41);
else
SetGf18 (DMA_CONTROL, 0x45);
}
}
shm->samplepos = count & (shm->samples - 1);
return (shm->samplepos);
}
//=============================================================================
// Stops the UltraSound playback
//=============================================================================
void
GUS_Shutdown (void)
{
if (HaveCodec) {
// Stop CODEC
dos_outportb (CodecRegisterSelect, CODEC_INTERFACE_CONFIG);
dos_outportb (CodecData, 0x01);
} else {
// Stop Voices
dos_outportb (Gf1PageRegister, 0);
SetGf18 (SET_CONTROL, 0x03);
dos_outportb (Gf1PageRegister, 1);
SetGf18 (SET_CONTROL, 0x03);
Gf1Delay ();
dos_outportb (Gf1PageRegister, 0);
SetGf18 (SET_CONTROL, 0x03);
dos_outportb (Gf1PageRegister, 1);
SetGf18 (SET_CONTROL, 0x03);
// Stop any DMA
SetGf18 (DMA_CONTROL, 0x00);
GetGf18 (DMA_CONTROL);
}
dos_outportb (DisableReg, DmaChannel | 4); // disable dma channel
}
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