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
  21 {
  22     /// <summary>
  23     /// Provides the ability to detect person appearance changes on image sources.
  24     /// </summary>
  25     /// <seealso cref="PersonAppearanceDetectionConfiguration"/>
  26     /// <since_tizen> 3</since_tizen>
  27     public class PersonAppearanceDetector : SurveillanceEngine
  28     {
  29         private const string KeyAppearedNumber = "NUMBER_OF_APPEARED_PERSONS";
  30         private const string KeyDisappearedNumber = "NUMBER_OF_DISAPPEARED_PERSONS";
  31         private const string KeyTrackedNumber = "NUMBER_OF_TRACKED_PERSONS";
  32         private const string KeyAppearedLocations = "APPEARED_PERSONS_LOCATIONS";
  33         private const string KeyDisappearedLocations = "DISAPPEARED_PERSONS_LOCATIONS";
  34         private const string KeyTrackedLocations = "TRACKED_PERSONS_LOCATIONS";
  35
  36         private const string PersonAppearanceEventType = "MV_SURVEILLANCE_EVENT_PERSON_APPEARED_DISAPEARED";
  37
  38         /// <summary>
  39         /// Initializes a new instance of the <see cref="PersonAppearanceDetector"/> class.
  40         /// </summary>
  41         /// <exception cref="NotSupportedException">The feature is not supported.</exception>
  42         /// <since_tizen> 3</since_tizen>
  43         public PersonAppearanceDetector() : base(PersonAppearanceEventType)
  44         {
  45         }
  46
  47         /// <summary>
  48         /// Occurs when the any appearance changes detected.
  49         /// </summary>
  50         /// <remarks>The event handler will be executed on an internal thread.</remarks>
  51         /// <since_tizen> 3</since_tizen>
  52         public event EventHandler<PersonAppearanceDetectedEventArgs> Detected;
  53
  54         internal override void OnEventDetected(IntPtr trigger, IntPtr source, int streamId,
  55             IntPtr result, IntPtr _)
  56         {
  57             try
  58             {
  59                 Detected?.Invoke(this, CreatePersonAppearanceChangedEventArgs(result));
  60             }
  61             catch (Exception e)
  62             {
  63                 MultimediaLog.Error(MediaVisionLog.Tag, "Failed to invoke Recognized event.", e);
  64             }
  65         }
  66
  67
  68         private PersonAppearanceDetectedEventArgs CreatePersonAppearanceChangedEventArgs(IntPtr result)
  69         {
  70             return new PersonAppearanceDetectedEventArgs(
  71                 GetResultAreas(result, KeyAppearedNumber, KeyAppearedLocations),
  72                 GetResultAreas(result, KeyDisappearedNumber, KeyDisappearedLocations),
  73                 GetResultAreas(result, KeyTrackedNumber, KeyTrackedLocations)
  74                 );
  75         }
  76
  77         private static Rectangle[] GetResultAreas(IntPtr result, string countKey, string regionsKey)
  78         {
  79             int count = 0;
  80             GetResultValue(result, countKey, out count).Validate("Failed to get result");
  81
  82             var rects = new global::Interop.MediaVision.Rectangle[count];
  83             if (count > 0)
  84             {
  85                 GetResultValue(result, regionsKey, rects).Validate("Failed to get result");
  86             }
  87
  88             return global::Interop.ToApiStruct(rects);
  89         }
  90
  91         /// <summary>
  92         /// Adds <see cref="SurveillanceSource"/>.
  93         /// </summary>
  94         /// <param name="source">The source used for recognition.</param>
  95         /// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
  96         /// <exception cref="ObjectDisposedException">The <see cref="PersonAppearanceDetector"/> has already been disposed of.</exception>
  97         /// <see cref="SurveillanceSource.Push(MediaVisionSource)"/>
  98         /// <since_tizen> 3</since_tizen>
  99         public void AddSource(SurveillanceSource source)
 100         {
 101             AddSource(source, null);
 102         }
 103
 104         /// <summary>
 105         /// Adds <see cref="SurveillanceSource"/> with the provided <see cref="PersonAppearanceDetectionConfiguration"/>.
 106         /// </summary>
 107         /// <param name="source">The source used for recognition.</param>
 108         /// <param name="config">The config for the <paramref name="source"/>. This value can be null.</param>
 109         /// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
 110         /// <exception cref="ObjectDisposedException">
 111         ///     The <see cref="PersonAppearanceDetector"/> has already been disposed of.\n
 112         ///     -or-\n
 113         ///     <paramref name="config"/> has already been disposed of.
 114         /// </exception>
 115         /// <see cref="SurveillanceSource.Push(MediaVisionSource)"/>
 116         /// <since_tizen> 3</since_tizen>
 117         public void AddSource(SurveillanceSource source, PersonAppearanceDetectionConfiguration config)
 118         {
 119             InvokeAddSource(source, config);
 120         }
 121     }
 122 }