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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/*
* FITS demuxer
* 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
*/
/**
* @file
* FITS demuxer.
*/
#include "libavutil/avassert.h"
#include "libavutil/intreadwrite.h"
#include "internal.h"
#include "libavutil/opt.h"
#include "libavcodec/fits.h"
#include "libavutil/bprint.h"
#define FITS_BLOCK_SIZE 2880
typedef struct FITSContext {
const AVClass *class;
AVRational framerate;
int first_image;
} FITSContext;
static int fits_probe(const AVProbeData *p)
{
const uint8_t *b = p->buf;
if (!memcmp(b, "SIMPLE = T", 30))
return AVPROBE_SCORE_MAX - 1;
return 0;
}
static int fits_read_header(AVFormatContext *s)
{
AVStream *st;
FITSContext * fits = s->priv_data;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_FITS;
avpriv_set_pts_info(st, 64, fits->framerate.den, fits->framerate.num);
fits->first_image = 1;
return 0;
}
/**
* Parses header and checks that the current HDU contains image or not
* It also stores the header in the avbuf and stores the size of data part in data_size
* @param s pointer to AVFormat Context
* @param fits pointer to FITSContext
* @param header pointer to FITSHeader
* @param avbuf pointer to AVBPrint to store the header
* @param data_size to store the size of data part
* @return 1 if image found, 0 if any other extension and AVERROR_INVALIDDATA otherwise
*/
static int64_t is_image(AVFormatContext *s, FITSContext *fits, FITSHeader *header,
AVBPrint *avbuf, uint64_t *data_size)
{
int i, ret, image = 0;
char buf[FITS_BLOCK_SIZE] = { 0 };
int64_t buf_size = 0, size = 0, t;
do {
ret = avio_read(s->pb, buf, FITS_BLOCK_SIZE);
if (ret < 0) {
return ret;
} else if (ret < FITS_BLOCK_SIZE) {
return AVERROR_INVALIDDATA;
}
av_bprint_append_data(avbuf, buf, FITS_BLOCK_SIZE);
ret = 0;
buf_size = 0;
while(!ret && buf_size < FITS_BLOCK_SIZE) {
ret = avpriv_fits_header_parse_line(s, header, buf + buf_size, NULL);
buf_size += 80;
}
} while (!ret);
if (ret < 0)
return ret;
image = fits->first_image || header->image_extension;
fits->first_image = 0;
if (header->groups) {
image = 0;
if (header->naxis > 1)
size = 1;
} else if (header->naxis) {
size = header->naxisn[0];
} else {
image = 0;
}
for (i = 1; i < header->naxis; i++) {
if(size && header->naxisn[i] > UINT64_MAX / size)
return AVERROR_INVALIDDATA;
size *= header->naxisn[i];
}
if(header->pcount > UINT64_MAX - size)
return AVERROR_INVALIDDATA;
size += header->pcount;
t = (abs(header->bitpix) >> 3) * ((int64_t) header->gcount);
if(size && t > INT64_MAX / size)
return AVERROR_INVALIDDATA;
size *= t;
if (!size) {
image = 0;
} else {
if(FITS_BLOCK_SIZE - 1 > INT64_MAX - size)
return AVERROR_INVALIDDATA;
size = ((size + FITS_BLOCK_SIZE - 1) / FITS_BLOCK_SIZE) * FITS_BLOCK_SIZE;
}
*data_size = size;
return image;
}
static int fits_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int64_t pos, ret;
uint64_t size;
FITSContext *fits = s->priv_data;
FITSHeader header;
AVBPrint avbuf;
char *buf;
if (fits->first_image) {
avpriv_fits_header_init(&header, STATE_SIMPLE);
} else {
avpriv_fits_header_init(&header, STATE_XTENSION);
}
av_bprint_init(&avbuf, FITS_BLOCK_SIZE, AV_BPRINT_SIZE_UNLIMITED);
while ((ret = is_image(s, fits, &header, &avbuf, &size)) == 0) {
av_bprint_finalize(&avbuf, NULL);
pos = avio_skip(s->pb, size);
if (pos < 0)
return pos;
av_bprint_init(&avbuf, FITS_BLOCK_SIZE, AV_BPRINT_SIZE_UNLIMITED);
avpriv_fits_header_init(&header, STATE_XTENSION);
}
if (ret < 0)
goto fail;
if (!av_bprint_is_complete(&avbuf)) {
ret = AVERROR(ENOMEM);
goto fail;
}
av_assert0(avbuf.len <= INT64_MAX && size <= INT64_MAX);
if (avbuf.len + size > INT_MAX - 80) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
// Header is sent with the first line removed...
ret = av_new_packet(pkt, avbuf.len - 80 + size);
if (ret < 0)
goto fail;
pkt->stream_index = 0;
pkt->flags |= AV_PKT_FLAG_KEY;
ret = av_bprint_finalize(&avbuf, &buf);
if (ret < 0) {
return ret;
}
memcpy(pkt->data, buf + 80, avbuf.len - 80);
pkt->size = avbuf.len - 80;
av_freep(&buf);
ret = avio_read(s->pb, pkt->data + pkt->size, size);
if (ret < 0)
return ret;
pkt->size += ret;
pkt->duration = 1;
return 0;
fail:
av_bprint_finalize(&avbuf, NULL);
return ret;
}
static const AVOption fits_options[] = {
{ "framerate", "set the framerate", offsetof(FITSContext, framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "1"}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM},
{ NULL },
};
static const AVClass fits_demuxer_class = {
.class_name = "FITS demuxer",
.option = fits_options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEMUXER,
};
const AVInputFormat ff_fits_demuxer = {
.name = "fits",
.long_name = NULL_IF_CONFIG_SMALL("Flexible Image Transport System"),
.priv_data_size = sizeof(FITSContext),
.read_probe = fits_probe,
.read_header = fits_read_header,
.read_packet = fits_read_packet,
.priv_class = &fits_demuxer_class,
.flags = AVFMT_NOTIMESTAMPS,
};
|
