blob: ca72cecb447ea31ae6bb71eae7ac7fdd946d7373 (
plain) (
blame)
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
|
// SPDX-License-Identifier: GPL-2.0
#include "metadata.h"
#include "exif.h"
#include "qthelper.h"
#include <QString>
#include <QFile>
#include <QDateTime>
// Fetch quint16 in big endian mode from QFile and return 0 on error.
// This is a very specialized function for parsing JPEGs, therefore we can get away with such an in-band error code.
static inline quint16 getShortBE(QFile &f)
{
unsigned char buf[2];
if (f.read(reinterpret_cast<char *>(buf), 2) != 2)
return 0;
return (buf[0] << 8) | buf[1];
}
static bool parseExif(QFile &f, struct metadata *metadata)
{
if (getShortBE(f) != 0xffd8)
return false;
for (;;) {
switch (getShortBE(f)) {
case 0xffc0:
case 0xffc2:
case 0xffc4:
case 0xffd0 ... 0xffd7:
case 0xffdb:
case 0xffdd:
case 0xffe0:
case 0xffe2 ... 0xffef:
case 0xfffe: {
quint16 len = getShortBE(f);
if (len < 2)
return false;
f.seek(f.pos() + len - 2); // TODO: switch to QFile::skip()
break;
}
case 0xffe1: {
quint16 len = getShortBE(f);
if (len < 2)
return false;
len -= 2;
QByteArray data = f.read(len);
if (data.size() != len)
return false;
easyexif::EXIFInfo exif;
if (exif.parseFromEXIFSegment(reinterpret_cast<const unsigned char *>(data.constData()), len) != PARSE_EXIF_SUCCESS)
return false;
metadata->longitude.udeg = lrint(1000000.0 * exif.GeoLocation.Longitude);
metadata->latitude.udeg = lrint(1000000.0 * exif.GeoLocation.Latitude);
metadata->timestamp = exif.epoch();
return true;
}
case 0xffda:
case 0xffd9:
// We expect EXIF data before any scan data
return false;
default:
return false;
}
}
}
static bool parseMP4(QFile &, metadata *)
{
// TODO: Implement MP4 parsing
return false;
}
extern "C" mediatype_t get_metadata(const char *filename_in, metadata *data)
{
data->timestamp = 0;
data->latitude.udeg = 0;
data->longitude.udeg = 0;
QString filename = localFilePath(QString(filename_in));
QFile f(filename);
if (!f.open(QIODevice::ReadOnly))
return MEDIATYPE_IO_ERROR;
if (parseExif(f, data)) {
return MEDIATYPE_PICTURE;
} else if(parseMP4(f, data)) {
return MEDIATYPE_VIDEO;
} else {
// If we couldn't parse EXIF or MP4 data, use file creation date.
// TODO: QFileInfo::created is deprecated in newer Qt versions.
data->timestamp = QFileInfo(filename).created().toMSecsSinceEpoch() / 1000;
return MEDIATYPE_UNKNOWN;
}
}
extern "C" timestamp_t picture_get_timestamp(const char *filename)
{
struct metadata data;
get_metadata(filename, &data);
return data.timestamp;
}
|
