src/Tizen.Multimedia.Vision/MediaVision/PersonAppearanceDetector.cs

   1 /*
   2  * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the License);
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an AS IS BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 using System;
  18 using static Interop.MediaVision.Surveillance;
  19
  20 namespace Tizen.Multimedia.Vision
  21 {
  22     /// <summary>
  23     /// Provides the ability to detect person appearance changes on image sources.
  24     /// </summary>
  25     /// <feature>http://tizen.org/feature/vision.face_recognition</feature>
  26     /// <feature>http://tizen.org/feature/vision.image_recognition</feature>
  27     /// <seealso cref="PersonAppearanceDetectionConfiguration"/>
  28     /// <since_tizen> 4 </since_tizen>
  29     public class PersonAppearanceDetector : SurveillanceEngine
  30     {
  31         private const string KeyAppearedNumber = "NUMBER_OF_APPEARED_PERSONS";
  32         private const string KeyDisappearedNumber = "NUMBER_OF_DISAPPEARED_PERSONS";
  33         private const string KeyTrackedNumber = "NUMBER_OF_TRACKED_PERSONS";
  34         private const string KeyAppearedLocations = "APPEARED_PERSONS_LOCATIONS";
  35         private const string KeyDisappearedLocations = "DISAPPEARED_PERSONS_LOCATIONS";
  36         private const string KeyTrackedLocations = "TRACKED_PERSONS_LOCATIONS";
  37
  38         private const string PersonAppearanceEventType = "MV_SURVEILLANCE_EVENT_PERSON_APPEARED_DISAPEARED";
  39
  40         /// <summary>
  41         /// Initializes a new instance of the <see cref="PersonAppearanceDetector"/> class.
  42         /// </summary>
  43         /// <exception cref="NotSupportedException">The required features are not supported.</exception>
  44         /// <since_tizen> 4 </since_tizen>
  45         public PersonAppearanceDetector() : base(PersonAppearanceEventType)
  46         {
  47         }
  48
  49         /// <summary>
  50         /// Occurs when the any appearance changes detected.
  51         /// </summary>
  52         /// <remarks>The event handler will be executed on an internal thread.</remarks>
  53         /// <since_tizen> 4 </since_tizen>
  54         public event EventHandler<PersonAppearanceDetectedEventArgs> Detected;
  55
  56         private void RegisterEvent()
  57         {
  58             _eventDetectedCallback = (IntPtr trigger, IntPtr source, int streamId, IntPtr result, IntPtr _) =>
  59             {
  60                 Detected?.Invoke(this, CreatePersonAppearanceChangedEventArgs(result));
  61             };
  62         }
  63
  64
  65         private PersonAppearanceDetectedEventArgs CreatePersonAppearanceChangedEventArgs(IntPtr result)
  66         {
  67             return new PersonAppearanceDetectedEventArgs(
  68                 GetResultAreas(result, KeyAppearedNumber, KeyAppearedLocations),
  69                 GetResultAreas(result, KeyDisappearedNumber, KeyDisappearedLocations),
  70                 GetResultAreas(result, KeyTrackedNumber, KeyTrackedLocations)
  71                 );
  72         }
  73
  74         private static Rectangle[] GetResultAreas(IntPtr result, string countKey, string regionsKey)
  75         {
  76             int count = 0;
  77             GetResultValue(result, countKey, out count).Validate("Failed to get result");
  78
  79             var rects = new global::Interop.MediaVision.Rectangle[count];
  80             if (count > 0)
  81             {
  82                 GetResultValue(result, regionsKey, rects).Validate("Failed to get result");
  83             }
  84
  85             return global::Interop.ToApiStruct(rects);
  86         }
  87
  88         /// <summary>
  89         /// Adds <see cref="SurveillanceSource"/>.
  90         /// </summary>
  91         /// <param name="source">The source used for recognition.</param>
  92         /// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
  93         /// <exception cref="ObjectDisposedException">The <see cref="PersonAppearanceDetector"/> has already been disposed of.</exception>
  94         /// <see cref="SurveillanceSource.Push(MediaVisionSource)"/>
  95         /// <since_tizen> 4 </since_tizen>
  96         public void AddSource(SurveillanceSource source)
  97         {
  98             AddSource(source, null);
  99         }
 100
 101         /// <summary>
 102         /// Adds <see cref="SurveillanceSource"/> with the provided <see cref="PersonAppearanceDetectionConfiguration"/>.
 103         /// </summary>
 104         /// <param name="source">The source used for recognition.</param>
 105         /// <param name="config">The config for the <paramref name="source"/>. This value can be null.</param>
 106         /// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
 107         /// <exception cref="ObjectDisposedException">
 108         ///     The <see cref="PersonAppearanceDetector"/> has already been disposed of.<br/>
 109         ///     -or-<br/>
 110         ///     <paramref name="config"/> has already been disposed of.
 111         /// </exception>
 112         /// <see cref="SurveillanceSource.Push(MediaVisionSource)"/>
 113         /// <since_tizen> 4 </since_tizen>
 114         public void AddSource(SurveillanceSource source, PersonAppearanceDetectionConfiguration config)
 115         {
 116             RegisterEvent();
 117             InvokeAddSource(source, config);
 118         }
 119     }
 120 }