updates chapters in media information object, improves #196

Author: tanersener

flutter/flutter/lib/chapter.dart

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019-2021 Taner Sener
+ * Copyright (c) 2021 Taner Sener
  *
  * This file is part of FFmpegKit.
  *
@@ -17,21 +17,51 @@
  * along with FFmpegKit.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+/// Chapter class.
 class Chapter {
-  int id;
-  String timeBase;
-  int start;
-  int end;
-  String startTime;
-  String endTime;
-  Tags tags;
-
-  Chapter(this.id, this.timeBase, this.start, this.end, this.startTime,
-      this.endTime, this.tags);
-}
+  static const keyId = "id";
+  static const keyTimeBase = "time_base";
+  static const keyStart = "start";
+  static const keyStartTime = "start_time";
+  static const keyEnd = "end";
+  static const keyEndTime = "end_time";
+  static const keyTags = "tags";
+
+  Map<dynamic, dynamic>? _allProperties;
+
+  /// Creates a new [Chapter] instance
+  Chapter(this._allProperties);
+
+  /// Returns id.
+  int? getId() => this.getNumberProperty(Chapter.keyId)?.toInt();
+
+  /// Returns time base.
+  String? getTimeBase() => this.getStringProperty(Chapter.keyTimeBase);
+
+  /// Returns start.
+  int? getStart() => this.getNumberProperty(Chapter.keyStart)?.toInt();
+
+  /// Returns start time.
+  String? getStartTime() => this.getStringProperty(Chapter.keyStartTime);
+
+  /// Returns end.
+  int? getEnd() => this.getNumberProperty(Chapter.keyEnd)?.toInt();
+
+  /// Returns end time.
+  String? getEndTime() => this.getStringProperty(Chapter.keyEndTime);
+
+  /// Returns all tags.
+  Map<dynamic, dynamic>? getTags() => this.getProperties(Chapter.keyTags);
+
+  /// Returns the chapter property associated with the key.
+  String? getStringProperty(String key) => this._allProperties?[key];
+
+  /// Returns the chapter property associated with the key.
+  num? getNumberProperty(String key) => this._allProperties?[key];
 
-class Tags {
-  String title;
+  /// Returns the chapter properties associated with the key.
+  dynamic getProperties(String key) => this._allProperties?[key];
 
-  Tags(this.title);
+  /// Returns all properties found.
+  Map<dynamic, dynamic>? getAllProperties() => this._allProperties;
 }

flutter/flutter/lib/ffprobe_kit.dart

@@ -76,6 +76,7 @@ class FFprobeKit {
       "json",
       "-show_format",
       "-show_streams",
+      "-show_chapters",
       "-i",
       path
     ];

flutter/flutter/lib/media_information.dart

@@ -88,25 +88,17 @@ class MediaInformation {
     return list;
   }
 
-  /// Returns all chapters
+  /// Returns all chapters found as a list.
   List<Chapter> getChapters() {
     final List<Chapter> list = List<Chapter>.empty(growable: true);
-    List<Chapter> chapters = List.empty(growable: true);
-    if (_allProperties?["chapters"] != null) {
-      chapters = <Chapter>[];
-      _allProperties!['chapters'].forEach((dynamic chapter) {
-        final int id = chapter['id'];
-        final String timeBase = chapter['time_base'];
-        final int start = chapter['start'];
-        final int end = chapter['end'];
-        final String startTime = chapter['start_time'];
-        final String endTime = chapter['end_time'];
-        final Tags tags = Tags(chapter['tags']['title'] ?? "");
-        chapters.add(
-            new Chapter(id, timeBase, start, end, startTime, endTime, tags));
-      });
-    }
-    list.addAll(chapters);
+
+    dynamic createChapter(Map<dynamic, dynamic> chapterProperties) =>
+        list.add(new Chapter(chapterProperties));
+
+    this._allProperties?["chapters"]?.forEach((Object? chapter) {
+      createChapter(chapter as Map<dynamic, dynamic>);
+    });
+
     return list;
   }
 

flutter/flutter/lib/stream_information.dart

@@ -119,6 +119,6 @@ class StreamInformation {
   /// Returns the stream properties associated with the key.
   dynamic getProperties(String key) => this._allProperties?[key];
 
-  /// Returns all properties found.d
+  /// Returns all properties found.
   Map<dynamic, dynamic>? getAllProperties() => this._allProperties;
 }