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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
* FITS implementation of common functions
* Copyright (c) 2017 Paras Chadha
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "libavutil/dict.h"
#include "fits.h"
int avpriv_fits_header_init(FITSHeader *header, FITSHeaderState state)
{
header->state = state;
header->naxis_index = 0;
header->blank_found = 0;
header->pcount = 0;
header->gcount = 1;
header->groups = 0;
header->rgb = 0;
header->image_extension = 0;
header->bscale = 1.0;
header->bzero = 0;
header->data_min_found = 0;
header->data_max_found = 0;
return 0;
}
static int dict_set_if_not_null(AVDictionary ***metadata, char *keyword, char *value)
{
if (metadata)
av_dict_set(*metadata, keyword, value, 0);
return 0;
}
/**
* Extract keyword and value from a header line (80 bytes) and store them in keyword and value strings respectively
* @param ptr8 pointer to the data
* @param keyword pointer to the char array in which keyword is to be stored
* @param value pointer to the char array in which value is to be stored
* @return 0 if calculated successfully otherwise AVERROR_INVALIDDATA
*/
static int read_keyword_value(const uint8_t *ptr8, char *keyword, char *value)
{
int i;
for (i = 0; i < 8 && ptr8[i] != ' '; i++) {
keyword[i] = ptr8[i];
}
keyword[i] = '\0';
if (ptr8[8] == '=') {
i = 10;
while (i < 80 && ptr8[i] == ' ') {
i++;
}
if (i < 80) {
*value++ = ptr8[i];
i++;
if (ptr8[i-1] == '\'') {
for (; i < 80 && ptr8[i] != '\''; i++) {
*value++ = ptr8[i];
}
*value++ = '\'';
} else if (ptr8[i-1] == '(') {
for (; i < 80 && ptr8[i] != ')'; i++) {
*value++ = ptr8[i];
}
*value++ = ')';
} else {
for (; i < 80 && ptr8[i] != ' ' && ptr8[i] != '/'; i++) {
*value++ = ptr8[i];
}
}
}
}
*value = '\0';
return 0;
}
#define CHECK_KEYWORD(key) \
if (strcmp(keyword, key)) { \
av_log(avcl, AV_LOG_ERROR, "expected %s keyword, found %s = %s\n", key, keyword, value); \
return AVERROR_INVALIDDATA; \
}
#define CHECK_VALUE(key, val) \
if (sscanf(value, "%d", &header->val) != 1) { \
av_log(avcl, AV_LOG_ERROR, "invalid value of %s keyword, %s = %s\n", key, keyword, value); \
return AVERROR_INVALIDDATA; \
}
int avpriv_fits_header_parse_line(void *avcl, FITSHeader *header, const uint8_t line[80], AVDictionary ***metadata)
{
int dim_no, ret;
int64_t t;
double d;
char keyword[10], value[72], c;
read_keyword_value(line, keyword, value);
switch (header->state) {
case STATE_SIMPLE:
CHECK_KEYWORD("SIMPLE");
if (value[0] == 'F') {
av_log(avcl, AV_LOG_WARNING, "not a standard FITS file\n");
} else if (value[0] != 'T') {
av_log(avcl, AV_LOG_ERROR, "invalid value of SIMPLE keyword, SIMPLE = %c\n", value[0]);
return AVERROR_INVALIDDATA;
}
header->state = STATE_BITPIX;
break;
case STATE_XTENSION:
CHECK_KEYWORD("XTENSION");
if (!strcmp(value, "'IMAGE '")) {
header->image_extension = 1;
}
header->state = STATE_BITPIX;
break;
case STATE_BITPIX:
CHECK_KEYWORD("BITPIX");
CHECK_VALUE("BITPIX", bitpix);
dict_set_if_not_null(metadata, keyword, value);
header->state = STATE_NAXIS;
break;
case STATE_NAXIS:
CHECK_KEYWORD("NAXIS");
CHECK_VALUE("NAXIS", naxis);
dict_set_if_not_null(metadata, keyword, value);
if (header->naxis) {
header->state = STATE_NAXIS_N;
} else {
header->state = STATE_REST;
}
break;
case STATE_NAXIS_N:
ret = sscanf(keyword, "NAXIS%d", &dim_no);
if (ret != 1 || dim_no != header->naxis_index + 1) {
av_log(avcl, AV_LOG_ERROR, "expected NAXIS%d keyword, found %s = %s\n", header->naxis_index + 1, keyword, value);
return AVERROR_INVALIDDATA;
}
if (sscanf(value, "%d", &header->naxisn[header->naxis_index]) != 1) {
av_log(avcl, AV_LOG_ERROR, "invalid value of NAXIS%d keyword, %s = %s\n", header->naxis_index + 1, keyword, value);
return AVERROR_INVALIDDATA;
}
dict_set_if_not_null(metadata, keyword, value);
header->naxis_index++;
if (header->naxis_index == header->naxis) {
header->state = STATE_REST;
}
break;
case STATE_REST:
if (!strcmp(keyword, "BLANK") && sscanf(value, "%"SCNd64"", &t) == 1) {
header->blank = t;
header->blank_found = 1;
} else if (!strcmp(keyword, "BSCALE") && sscanf(value, "%lf", &d) == 1) {
header->bscale = d;
} else if (!strcmp(keyword, "BZERO") && sscanf(value, "%lf", &d) == 1) {
header->bzero = d;
} else if (!strcmp(keyword, "CTYPE3") && !strncmp(value, "'RGB", 4)) {
header->rgb = 1;
} else if (!strcmp(keyword, "DATAMAX") && sscanf(value, "%lf", &d) == 1) {
header->data_max_found = 1;
header->data_max = d;
} else if (!strcmp(keyword, "DATAMIN") && sscanf(value, "%lf", &d) == 1) {
header->data_min_found = 1;
header->data_min = d;
} else if (!strcmp(keyword, "END")) {
return 1;
} else if (!strcmp(keyword, "GROUPS") && sscanf(value, "%c", &c) == 1) {
header->groups = (c == 'T');
} else if (!strcmp(keyword, "GCOUNT") && sscanf(value, "%"SCNd64"", &t) == 1) {
header->gcount = t;
} else if (!strcmp(keyword, "PCOUNT") && sscanf(value, "%"SCNd64"", &t) == 1) {
header->pcount = t;
}
dict_set_if_not_null(metadata, keyword, value);
break;
}
return 0;
}
|
