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1 // Copyright 2013 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_MEDIA_METADATA_PARSER_H_
6 #define CHROME_UTILITY_MEDIA_GALLERIES_MEDIA_METADATA_PARSER_H_
7 
8 #include <string>
9 #include <vector>
10 
11 #include "base/callback.h"
12 #include "base/memory/scoped_ptr.h"
13 #include "chrome/common/extensions/api/media_galleries.h"
14 #include "chrome/common/media_galleries/metadata_types.h"
15 
16 namespace base {
17 class Thread;
18 }
19 
20 namespace media {
21 class DataSource;
22 }
23 
24 namespace metadata {
25 
26 // This class takes a MIME type and data source and parses its metadata. It
27 // handles audio, video, and images. It delegates its operations to FFMPEG,
28 // libexif, etc. This class lives and operates on the utility thread of the
29 // utility process, as we wish to sandbox potentially dangerous operations
30 // on user-provided data.
31 class MediaMetadataParser {
32  public:
33   typedef extensions::api::media_galleries::MediaMetadata MediaMetadata;
34   typedef base::Callback<
35       void(const MediaMetadata& metadata,
36            const std::vector<AttachedImage>& attached_images)>
37   MetadataCallback;
38 
39   // Does not take ownership of |source|. Caller is responsible for ensuring
40   // that |source| outlives this object.
41   MediaMetadataParser(media::DataSource* source, const std::string& mime_type,
42                       bool get_attached_images);
43 
44   ~MediaMetadataParser();
45 
46   // |callback| is called on same message loop.
47   void Start(const MetadataCallback& callback);
48 
49  private:
50   // Only accessed on |media_thread_| from this class.
51   media::DataSource* const source_;
52 
53   const std::string mime_type_;
54 
55   bool get_attached_images_;
56 
57   // Thread that blocking media parsing operations run on while the main thread
58   // handles messages from the browser process.
59   // TODO(tommycli): Replace with a reference to a WorkerPool if we ever use
60   // this class in batch mode.
61   scoped_ptr<base::Thread> media_thread_;
62 
63   DISALLOW_COPY_AND_ASSIGN(MediaMetadataParser);
64 };
65 
66 }  // namespace metadata
67 
68 #endif  // CHROME_UTILITY_MEDIA_GALLERIES_MEDIA_METADATA_PARSER_H_
69