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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CHROME_UTILITY_MEDIA_GALLERIES_IMAGE_METADATA_EXTRACTOR_H_ | |
6 #define CHROME_UTILITY_MEDIA_GALLERIES_IMAGE_METADATA_EXTRACTOR_H_ | |
7 | |
8 #include <string> | |
9 | |
10 #include "base/callback_forward.h" | |
11 #include "base/macros.h" | |
12 #include "base/memory/ref_counted.h" | |
13 | |
14 namespace media { | |
15 class DataSource; | |
16 } | |
17 | |
18 namespace net { | |
19 class DrainableIOBuffer; | |
20 } | |
21 | |
22 namespace metadata { | |
23 | |
24 // Extracts a basic set of image metadata tags. Users must initialize the | |
25 // library before use. Each class instance is 'one-time-use', and cannot be used | |
26 // to extract metadata from multiple images. | |
27 class ImageMetadataExtractor { | |
28 public: | |
29 typedef base::Callback<void(bool)> DoneCallback; | |
30 | |
31 // One of these two is required before use of this class. | |
32 static bool InitializeLibrary(); | |
33 static bool InitializeLibraryForTesting(); | |
34 | |
35 ImageMetadataExtractor(); | |
36 ~ImageMetadataExtractor(); | |
37 | |
38 // |callback| called with whether or not the extraction succeeded. Should | |
39 // only be called once. | |
40 void Extract(media::DataSource* source, const DoneCallback& callback); | |
41 | |
42 // All below methods require Extract to have already succeeded. | |
43 // Returns -1 if file does not define a width or height. | |
44 int width() const; | |
45 int height() const; | |
46 | |
47 // In degrees. | |
48 int rotation() const; | |
49 | |
50 // In pixels per inch. | |
51 double x_resolution() const; | |
52 double y_resolution() const; | |
53 | |
54 // In the same string form as the original file. | |
55 const std::string& date() const; | |
56 | |
57 const std::string& camera_make() const; | |
58 const std::string& camera_model() const; | |
59 double exposure_time_sec() const; | |
60 bool flash_fired() const; | |
61 double f_number() const; | |
62 double focal_length_mm() const; | |
63 int iso_equivalent() const; | |
64 | |
65 private: | |
66 // Second half of the Extract method. | |
67 void FinishExtraction(const DoneCallback& callback, | |
68 const scoped_refptr<net::DrainableIOBuffer>& buffer); | |
69 | |
70 bool extracted_; | |
71 | |
72 int width_; | |
73 int height_; | |
74 | |
75 int rotation_; | |
76 | |
77 double x_resolution_; | |
78 double y_resolution_; | |
79 | |
80 std::string date_; | |
81 | |
82 std::string camera_make_; | |
83 std::string camera_model_; | |
84 double exposure_time_sec_; | |
85 bool flash_fired_; | |
86 double f_number_; | |
87 double focal_length_mm_; | |
88 int iso_equivalent_; | |
89 | |
90 DISALLOW_COPY_AND_ASSIGN(ImageMetadataExtractor); | |
91 }; | |
92 | |
93 } // namespace metadata | |
94 | |
95 #endif // CHROME_UTILITY_MEDIA_GALLERIES_IMAGE_METADATA_EXTRACTOR_H_ | |
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