ref: bd6ef57ac4785f70c58d02feb627407c73a2b909
dir: /src/gusconf.c/
//
// Copyright(C) 2005-2014 Simon Howard
//
// 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.
//
// DESCRIPTION:
// GUS emulation code.
//
// Actually emulating a GUS is far too much work; fortunately
// GUS "emulation" already exists in the form of Timidity, which
// supports GUS patch files. This code therefore converts Doom's
// DMXGUS lump into an equivalent Timidity configuration file.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "m_misc.h"
#include "w_wad.h"
#include "z_zone.h"
#define MAX_INSTRUMENTS 256
typedef struct
{
char *patch_names[MAX_INSTRUMENTS];
int used[MAX_INSTRUMENTS];
int mapping[MAX_INSTRUMENTS];
unsigned int count;
} gus_config_t;
char *gus_patch_path = "";
int gus_ram_kb = 1024;
static unsigned int MappingIndex(void)
{
unsigned int result = gus_ram_kb / 256;
if (result < 1)
{
return 1;
}
else if (result > 4)
{
return 4;
}
else
{
return result;
}
}
static int SplitLine(char *line, char **fields, unsigned int max_fields)
{
unsigned int num_fields;
char *p;
fields[0] = line;
num_fields = 1;
for (p = line; *p != '\0'; ++p)
{
if (*p == ',')
{
*p = '\0';
// Skip spaces following the comma.
do
{
++p;
} while (*p != '\0' && isspace(*p));
fields[num_fields] = p;
++num_fields;
--p;
if (num_fields >= max_fields)
{
break;
}
}
else if (*p == '#')
{
*p = '\0';
break;
}
}
// Strip off trailing whitespace from the end of the line.
p = fields[num_fields - 1] + strlen(fields[num_fields - 1]);
while (p > fields[num_fields - 1] && isspace(*(p - 1)))
{
--p;
*p = '\0';
}
return num_fields;
}
static void ParseLine(gus_config_t *config, char *line)
{
char *fields[6];
unsigned int i;
unsigned int num_fields;
unsigned int instr_id, mapped_id;
num_fields = SplitLine(line, fields, 6);
if (num_fields < 6)
{
return;
}
instr_id = atoi(fields[0]);
// Skip non GM percussions.
if ((instr_id >= 128 && instr_id < 128 + 35) || instr_id > 128 + 81)
{
return;
}
mapped_id = atoi(fields[MappingIndex()]);
for (i = 0; i < config->count; i++)
{
if (config->used[i] == mapped_id)
{
break;
}
}
if (i == config->count)
{
// DMX uses wrong patch name (we should use name of 'mapped_id'
// instrument, but DMX uses name of 'instr_id' instead).
free(config->patch_names[i]);
config->patch_names[i] = M_StringDuplicate(fields[5]);
config->used[i] = mapped_id;
config->count++;
}
config->mapping[instr_id] = i;
}
static void ParseDMXConfig(char *dmxconf, gus_config_t *config)
{
char *p, *newline;
unsigned int i;
memset(config, 0, sizeof(gus_config_t));
for (i = 0; i < MAX_INSTRUMENTS; ++i)
{
config->mapping[i] = -1;
config->used[i] = -1;
}
config->count = 0;
p = dmxconf;
for (;;)
{
newline = strchr(p, '\n');
if (newline != NULL)
{
*newline = '\0';
}
ParseLine(config, p);
if (newline == NULL)
{
break;
}
else
{
p = newline + 1;
}
}
}
static void FreeDMXConfig(gus_config_t *config)
{
unsigned int i;
for (i = 0; i < MAX_INSTRUMENTS; ++i)
{
free(config->patch_names[i]);
}
}
static char *ReadDMXConfig(void)
{
int lumpnum;
unsigned int len;
char *data;
// TODO: This should be chosen based on gamemode == commercial:
lumpnum = W_CheckNumForName("DMXGUS");
if (lumpnum < 0)
{
lumpnum = W_GetNumForName("DMXGUSC");
}
len = W_LumpLength(lumpnum);
data = Z_Malloc(len + 1, PU_STATIC, NULL);
W_ReadLump(lumpnum, data);
data[len] = '\0';
return data;
}
static boolean WriteTimidityConfig(char *path, gus_config_t *config)
{
FILE *fstream;
unsigned int i;
fstream = M_fopen(path, "w");
if (fstream == NULL)
{
return false;
}
fprintf(fstream, "# Autogenerated Timidity config.\n\n");
fprintf(fstream, "dir %s\n", gus_patch_path);
fprintf(fstream, "\nbank 0\n\n");
for (i = 0; i < 128; ++i)
{
if (config->mapping[i] >= 0 && config->mapping[i] < MAX_INSTRUMENTS
&& config->patch_names[config->mapping[i]] != NULL)
{
fprintf(fstream, "%u %s\n",
i, config->patch_names[config->mapping[i]]);
}
}
fprintf(fstream, "\ndrumset 0\n\n");
for (i = 128 + 35; i <= 128 + 81; ++i)
{
if (config->mapping[i] >= 0 && config->mapping[i] < MAX_INSTRUMENTS
&& config->patch_names[config->mapping[i]] != NULL)
{
fprintf(fstream, "%u %s\n",
i - 128, config->patch_names[config->mapping[i]]);
}
}
fprintf(fstream, "\n");
fclose(fstream);
return true;
}
boolean GUS_WriteConfig(char *path)
{
boolean result;
char *dmxconf;
gus_config_t config;
if (!strcmp(gus_patch_path, ""))
{
printf("You haven't configured gus_patch_path.\n");
printf("gus_patch_path needs to point to the location of "
"your GUS patch set.\n"
"To get a copy of the \"standard\" GUS patches, "
"download a copy of dgguspat.zip.\n");
return false;
}
dmxconf = ReadDMXConfig();
ParseDMXConfig(dmxconf, &config);
result = WriteTimidityConfig(path, &config);
FreeDMXConfig(&config);
Z_Free(dmxconf);
return result;
}