media/base/audio_video_metadata_extractor.h

   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 MEDIA_BASE_AUDIO_VIDEO_METADATA_EXTRACTOR_H_
   6 #define MEDIA_BASE_AUDIO_VIDEO_METADATA_EXTRACTOR_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "media/base/media_export.h"
  12
  13 struct AVDictionary;
  14
  15 namespace media {
  16
  17 class DataSource;
  18
  19 // This class extracts a string dictionary of metadata tags for audio and video
  20 // files. It also provides the format name.
  21 class MEDIA_EXPORT AudioVideoMetadataExtractor {
  22  public:
  23   AudioVideoMetadataExtractor();
  24   ~AudioVideoMetadataExtractor();
  25
  26   // Returns whether or not the fields were successfully extracted. Should only
  27   // be called once.
  28   bool Extract(DataSource* source);
  29
  30   // Returns -1 if we cannot extract the duration. In seconds.
  31   double duration() const;
  32
  33   // Returns -1 for containers without video.
  34   int width() const;
  35   int height() const;
  36
  37   // Returns -1 or an empty string if the value is undefined.
  38   const std::string& album() const;
  39   const std::string& artist() const;
  40   const std::string& comment() const;
  41   const std::string& copyright() const;
  42   const std::string& date() const;
  43   int disc() const;
  44   const std::string& encoder() const;
  45   const std::string& encoded_by() const;
  46   const std::string& genre() const;
  47   const std::string& language() const;
  48   const std::string& title() const;
  49   int track() const;
  50
  51  private:
  52   void ExtractDictionary(AVDictionary* metadata);
  53
  54   bool extracted_;
  55
  56   int duration_;
  57   int width_;
  58   int height_;
  59
  60   std::string album_;
  61   std::string artist_;
  62   std::string comment_;
  63   std::string copyright_;
  64   std::string date_;
  65   int disc_;
  66   std::string encoder_;
  67   std::string encoded_by_;
  68   std::string genre_;
  69   std::string language_;
  70   std::string title_;
  71   int track_;
  72
  73   DISALLOW_COPY_AND_ASSIGN(AudioVideoMetadataExtractor);
  74 };
  75
  76 }  // namespace media
  77
  78 #endif  // MEDIA_BASE_AUDIO_VIDEO_METADATA_EXTRACTOR_H_