1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/*
* sap2ntsc.c - convert PAL SAP files to NTSC
*
* Copyright (C) 2012-2019 Piotr Fusik
*
* This file is part of ASAP (Another Slight Atari Player),
* see http://asap.sourceforge.net
*
* ASAP 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.
*
* ASAP 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 ASAP; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* public API doesn't allow us to set NTSC or FASTPLAY */
#include "asap.c"
static void fatal_error(const char *format, ...)
{
va_list args;
va_start(args, format);
fprintf(stderr, "sap2ntsc: ");
vfprintf(stderr, format, args);
fputc('\n', stderr);
va_end(args);
exit(1);
}
static void process_file(const char *filename)
{
/* check filename */
const char *ext = strrchr(filename, '.');
if (ext == NULL || strcasecmp(ext, ".sap") != 0)
fatal_error("%s: filename must be *.sap", filename);
/* read file */
FILE *fp = fopen(filename, "rb");
if (fp == NULL)
fatal_error("cannot open %s", filename);
static unsigned char module[ASAPInfo_MAX_MODULE_LENGTH];
int module_len = fread(module, 1, sizeof(module), fp);
fclose(fp);
/* parse file */
ASAPInfo *info = ASAPInfo_New();
if (info == NULL)
fatal_error("out of memory");
if (!ASAPInfo_Load(info, filename, module, module_len))
fatal_error("%s: unsupported file", filename);
/* check if conversion possible */
if (ASAPInfo_IsNtsc(info))
fatal_error("%s: is already NTSC", filename);
if (ASAPInfo_GetPlayerRateScanlines(info) != 312)
fatal_error("%s: uses FASTPLAY", filename);
/* do the conversion */
ASAPWriter *writer = ASAPWriter_New();
if (writer == NULL)
fatal_error("out of memory");
info->ntsc = true;
info->fastplay = 262;
for (int i = 0; i < ASAPInfo_GetSongs(info); i++) {
int duration = ASAPInfo_GetDuration(info, i);
if (duration > 0)
ASAPInfo_SetDuration(info, i, (int) (duration * (1773447 / 1789772.5 * 262 / 312)));
}
static unsigned char output[ASAPInfo_MAX_MODULE_LENGTH];
ASAPWriter_SetOutput(writer, output, 0, sizeof(output));
int output_len = ASAPWriter_Write(writer, filename, info, module, module_len, true);
ASAPWriter_Delete(writer);
if (output_len < 0)
fatal_error("%s: conversion error", filename);
/* write file */
fp = fopen(filename, "wb");
if (fp == NULL)
fatal_error("cannot write %s", filename);
if (fwrite(output, output_len, 1, fp) != 1) {
fclose(fp);
remove(filename); /* "unlink" is less portable */
fatal_error("%s: write error", filename);
}
fclose(fp);
/* print summary */
printf("%s: ", filename);
int warnings = 0;
/* issue a warning for samples - they may break on NTSC */
/* TYPE S has FASTPLAY!=312, so it has been rejected earlier */
if (ASAPInfo_GetTypeLetter(info) == 'D') {
printf("WARNING: TYPE D");
warnings++;
}
/* issue a warning if the 6502 code possibly reads the PAL/NTSC flag of GTIA
(LDA/LDX/LDY $D014, e.g. Ghostbusters.sap).
This is just a guess - false positives are possible and other code may be used for NTSC detection. */
for (int i = 0; i < module_len - 2; i++) {
if (module[i] >= 0xac && module[i] <= 0xae && module[i + 1] == 0x14 && module[i + 2] == 0xd0) {
if (warnings++ > 0)
printf(", ");
printf("WARNING: possible PAL/NTSC detection code");
break;
}
}
ASAPInfo_Delete(info);
if (warnings == 0)
printf("ok");
printf("\n");
}
int main(int argc, char **argv)
{
bool usage = true;
for (int i = 1; i < argc; i++) {
const char *arg = argv[i];
if (strcmp(arg, "--help") == 0) {
usage = true;
break;
}
if (strcmp(arg, "--version") == 0) {
printf("sap2ntsc " ASAPInfo_VERSION "\n");
return 0;
}
process_file(arg);
usage = false;
}
if (usage) {
printf(
"Usage: sap2ntsc FILE.sap...\n"
"Replaces FILE.sap with an NTSC version\n"
);
}
return 0;
}
|
