src/Tizen.Multimedia.Camera/Camera/Camera.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 System.Collections.Generic;
  19 using System.Diagnostics;
  20 using System.Linq;
  21 using System.Runtime.InteropServices;
  22 using System.Threading;
  23 using static Interop;
  24 using Native = Interop.Camera;
  25
  26 namespace Tizen.Multimedia
  27 {
  28     static internal class CameraLog
  29     {
  30         internal const string Tag = "Tizen.Multimedia.Camera";
  31         internal const string Enter = "[Enter]";
  32         internal const string Leave = "[Leave]";
  33     }
  34
  35     /// <summary>
  36     /// This camera class provides methods to capture photos and supports setting up notifications
  37     /// for state changes of capturing, previewing, focusing, and informing about the resolution and the binary format,
  38     /// and functions for picture manipulations like sepia, negative, and many more.
  39     /// It also notifies you when a significant picture parameter changes, (For example, focus).
  40     /// </summary>
  41     /// <since_tizen> 3 </since_tizen>
  42     /// <feature> http://tizen.org/feature/camera </feature>
  43     public class Camera : IDisposable, IDisplayable<CameraError>
  44     {
  45         private IntPtr _handle = IntPtr.Zero;
  46         private bool _disposed = false;
  47         private CameraState _state = CameraState.None;
  48
  49         /// <summary>
  50         /// Initializes a new instance of the <see cref="Camera"/> class.
  51         /// </summary>
  52         /// <param name="device">The camera device to access.</param>
  53         /// <exception cref="ArgumentException">Invalid CameraDevice type.</exception>
  54         /// <exception cref="NotSupportedException">The camera feature is not supported.</exception>
  55         /// <since_tizen> 3 </since_tizen>
  56         /// <feature> http://tizen.org/feature/camera </feature>
  57         public Camera(CameraDevice device)
  58         {
  59             if (!Features.IsSupported(CameraFeatures.Camera))
  60             {
  61                 throw new NotSupportedException("Camera feature is not supported.");
  62             }
  63
  64             Native.Create(device, out _handle).ThrowIfFailed("Failed to create camera instance");
  65
  66             Capabilities = new CameraCapabilities(this);
  67             Settings = new CameraSettings(this);
  68             DisplaySettings = new CameraDisplaySettings(this);
  69
  70             RegisterCallbacks();
  71
  72             SetState(CameraState.Created);
  73         }
  74
  75         /// <summary>
  76         /// Finalizes an instance of the Camera class.
  77         /// </summary>
  78         ~Camera()
  79         {
  80             Dispose(false);
  81         }
  82
  83         /// <summary>
  84         /// Gets the native handle of the camera.
  85         /// </summary>
  86         /// <since_tizen> 3 </since_tizen>
  87         /// <feature> http://tizen.org/feature/camera </feature>
  88         public IntPtr Handle => GetHandle();
  89
  90         internal IntPtr GetHandle()
  91         {
  92             ValidateNotDisposed();
  93             return _handle;
  94         }
  95
  96         #region Dispose support
  97         /// <summary>
  98         /// Releases the unmanaged resources used by the camera.
  99         /// </summary>
 100         /// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
 101         /// <since_tizen> 3 </since_tizen>
 102         protected virtual void Dispose(bool disposing)
 103         {
 104             if (!_disposed)
 105             {
 106                 if (disposing)
 107                 {
 108                     // to be used if there are any other disposable objects
 109                 }
 110
 111                 if (_handle != IntPtr.Zero)
 112                 {
 113                     Native.Destroy(_handle);
 114                     _handle = IntPtr.Zero;
 115                 }
 116
 117                 _disposed = true;
 118             }
 119         }
 120
 121         /// <summary>
 122         /// Releases all resources used by the camera.
 123         /// </summary>
 124         /// <since_tizen> 3 </since_tizen>
 125         /// <feature> http://tizen.org/feature/camera </feature>
 126         public void Dispose()
 127         {
 128             ReplaceDisplay(null);
 129             Dispose(true);
 130             GC.SuppressFinalize(this);
 131         }
 132
 133         internal void ValidateNotDisposed()
 134         {
 135             if (_disposed)
 136             {
 137                 Log.Error(CameraLog.Tag, "Camera handle is disposed.");
 138                 throw new ObjectDisposedException(nameof(Camera));
 139             }
 140         }
 141         #endregion Dispose support
 142
 143         #region Check camera state
 144         internal void ValidateState(params CameraState[] required)
 145         {
 146             ValidateNotDisposed();
 147
 148             Debug.Assert(required.Length > 0);
 149
 150             var curState = _state;
 151             if (!required.Contains(curState))
 152             {
 153                 throw new InvalidOperationException($"The camera is not in a valid state. " +
 154                     $"Current State : { curState }, Valid State : { string.Join(", ", required) }.");
 155             }
 156         }
 157
 158         internal void SetState(CameraState state)
 159         {
 160             _state = state;
 161         }
 162         #endregion Check camera state
 163
 164         #region EventHandlers
 165         /// <summary>
 166         /// An event that occurs when the camera interrupt is started by the policy.
 167         /// </summary>
 168         /// <since_tizen> 4 </since_tizen>
 169         public event EventHandler<CameraInterruptStartedEventArgs> InterruptStarted;
 170         private Native.InterruptStartedCallback _interruptStartedCallback;
 171
 172         /// <summary>
 173         /// An event that occurs when an camera is interrupted by the policy.
 174         /// </summary>
 175         /// <since_tizen> 3 </since_tizen>
 176         public event EventHandler<CameraInterruptedEventArgs> Interrupted;
 177         private Native.InterruptedCallback _interruptedCallback;
 178
 179         /// <summary>
 180         /// An event that occurs when there is an asynchronous error.
 181         /// </summary>
 182         /// <since_tizen> 3 </since_tizen>
 183         public event EventHandler<CameraErrorOccurredEventArgs> ErrorOccurred;
 184         private Native.ErrorCallback _errorCallback;
 185
 186         /// <summary>
 187         /// An event that occurs when the auto focus state is changed.
 188         /// </summary>
 189         /// <since_tizen> 3 </since_tizen>
 190         public event EventHandler<CameraFocusStateChangedEventArgs> FocusStateChanged;
 191         private Native.FocusStateChangedCallback _focusStateChangedCallback;
 192
 193         /// <summary>
 194         /// An event that occurs when a face is detected in the preview frame.
 195         /// </summary>
 196         /// <since_tizen> 3 </since_tizen>
 197         public event EventHandler<FaceDetectedEventArgs> FaceDetected;
 198         private Native.FaceDetectedCallback _faceDetectedCallback;
 199
 200         /// <summary>
 201         /// An event that occurs during capture of an image.
 202         /// </summary>
 203         /// <since_tizen> 3 </since_tizen>
 204         public event EventHandler<CameraCapturingEventArgs> Capturing;
 205         private Native.CapturingCallback _capturingCallback;
 206
 207         /// <summary>
 208         /// An event that occurs after the capture of the image.
 209         /// </summary>
 210         /// <since_tizen> 3 </since_tizen>
 211         public event EventHandler<EventArgs> CaptureCompleted;
 212         private Native.CaptureCompletedCallback _captureCompletedCallback;
 213
 214         private Native.HdrCaptureProgressCallback _hdrCaptureProgressCallback;
 215         private event EventHandler<HdrCaptureProgressEventArgs> _hdrCaptureProgress;
 216         private object _hdrCaptureProgressEventLock = new object();
 217
 218         /// <summary>
 219         /// An event that occurs when there is a change in the HDR capture progress.
 220         /// Checks whether the <see cref="CameraCapabilities.IsHdrCaptureSupported"/> is supported or not before adding this EventHandler.
 221         /// </summary>
 222         /// <since_tizen> 3 </since_tizen>
 223         /// <exception cref="NotSupportedException">In case of HDR feature is not supported.</exception>
 224         public event EventHandler<HdrCaptureProgressEventArgs> HdrCaptureProgress
 225         {
 226             add
 227             {
 228                 lock (_hdrCaptureProgressEventLock)
 229                 {
 230                     if (_hdrCaptureProgress == null)
 231                     {
 232                         RegisterHdrCaptureProgress();
 233                     }
 234
 235                     _hdrCaptureProgress += value;
 236                 }
 237             }
 238
 239             remove
 240             {
 241                 lock (_hdrCaptureProgressEventLock)
 242                 {
 243                     _hdrCaptureProgress -= value;
 244
 245                     if (_hdrCaptureProgress == null)
 246                     {
 247                         UnregisterHdrCaptureProgress();
 248                     }
 249                 }
 250             }
 251         }
 252
 253         /// <summary>
 254         /// An event that occurs when the camera state is changed.
 255         /// </summary>
 256         /// <since_tizen> 3 </since_tizen>
 257         public event EventHandler<CameraStateChangedEventArgs> StateChanged;
 258         private Native.StateChangedCallback _stateChangedCallback;
 259
 260         private static Native.DeviceStateChangedCallback _deviceStateChangedCallback;
 261         private static event EventHandler<CameraDeviceStateChangedEventArgs> _deviceStateChanged;
 262         private static object _deviceStateChangedEventLock = new object();
 263         private static int _deviceStateCallbackId;
 264
 265         /// <summary>
 266         /// An event that occurs after the <see cref="CameraDeviceState"/> is changed.
 267         /// </summary>
 268         /// <since_tizen> 3 </since_tizen>
 269         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 270         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 271         /// <exception cref="ArgumentException">In case of invalid parameters.</exception>
 272         public static event EventHandler<CameraDeviceStateChangedEventArgs> DeviceStateChanged
 273         {
 274             add
 275             {
 276                 lock (_deviceStateChangedEventLock)
 277                 {
 278                     if (_deviceStateChanged == null)
 279                     {
 280                         RegisterDeviceStateChangedCallback();
 281                     }
 282
 283                     _deviceStateChanged += value;
 284                 }
 285             }
 286
 287             remove
 288             {
 289                 lock (_deviceStateChangedEventLock)
 290                 {
 291                     _deviceStateChanged -= value;
 292
 293                     if (_deviceStateChanged == null)
 294                     {
 295                         UnregisterDeviceStateChangedCallback();
 296                     }
 297                 }
 298             }
 299         }
 300
 301         private Native.PreviewCallback _previewCallback;
 302         private event EventHandler<PreviewEventArgs> _preview;
 303         private object _previewEventLock = new object();
 304         /// <summary>
 305         /// An event that occurs once per frame when previewing.
 306         /// Preview callback is registered when an user adds a callback explicitly to avoid useless P/Invoke.
 307         /// </summary>
 308         /// <since_tizen> 3 </since_tizen>
 309         public event EventHandler<PreviewEventArgs> Preview
 310         {
 311             add
 312             {
 313                 lock (_previewEventLock)
 314                 {
 315                     if (_preview == null)
 316                     {
 317                         RegisterPreviewCallback();
 318                     }
 319
 320                     _preview += value;
 321                 }
 322             }
 323
 324             remove
 325             {
 326                 lock (_previewEventLock)
 327                 {
 328                     _preview -= value;
 329
 330                     if (_preview == null)
 331                     {
 332                         UnregisterPreviewCallback();
 333                     }
 334                 }
 335             }
 336         }
 337
 338         private Native.MediaPacketPreviewCallback _mediaPacketPreviewCallback;
 339         private EventHandler<MediaPacketPreviewEventArgs> _mediaPacketPreview;
 340         private object _mediaPacketPreviewEventLock = new object();
 341
 342         /// <summary>
 343         /// An event that occurs once per frame when previewing.
 344         /// Preview callback is registered when an user adds a callback explicitly to avoid useless P/Invoke.
 345         /// </summary>
 346         /// <since_tizen> 3 </since_tizen>
 347         public event EventHandler<MediaPacketPreviewEventArgs> MediaPacketPreview
 348         {
 349             add
 350             {
 351                 lock (_mediaPacketPreviewEventLock)
 352                 {
 353                     if (_mediaPacketPreview == null)
 354                     {
 355                         RegisterMediaPacketPreviewCallback();
 356                     }
 357
 358                     _mediaPacketPreview += value;
 359                 }
 360             }
 361
 362             remove
 363             {
 364                 lock (_mediaPacketPreviewEventLock)
 365                 {
 366                     _mediaPacketPreview -= value;
 367
 368                     if (_mediaPacketPreview == null)
 369                     {
 370                         UnregisterMediaPacketPreviewCallback();
 371                     }
 372                 }
 373             }
 374         }
 375         #endregion EventHandlers
 376
 377         #region Properties
 378         /// <summary>
 379         /// Gets or sets the various camera settings.
 380         /// </summary>
 381         /// <since_tizen> 4 </since_tizen>
 382         public CameraSettings Settings { get; }
 383
 384         /// <summary>
 385         /// Gets the various camera capabilities.
 386         /// </summary>
 387         /// <since_tizen> 4 </since_tizen>
 388         public CameraCapabilities Capabilities { get; }
 389
 390         /// <summary>
 391         /// Get/set various camera display properties.
 392         /// </summary>
 393         /// <since_tizen> 3 </since_tizen>
 394         public CameraDisplaySettings DisplaySettings { get; }
 395
 396         private Display _display;
 397
 398         private CameraError SetDisplay(Display display)
 399         {
 400             if (display == null)
 401             {
 402                 return CameraDisplay.SetTarget(GetHandle(), DisplayType.None, IntPtr.Zero);
 403             }
 404
 405             return display.ApplyTo(this);
 406         }
 407
 408         private void ReplaceDisplay(Display newDisplay)
 409         {
 410             _display?.SetOwner(null);
 411             _display = newDisplay;
 412             _display?.SetOwner(this);
 413         }
 414
 415         /// <summary>
 416         /// Sets or gets the display type and handle to show preview images.
 417         /// The camera must be in the <see cref="CameraState.Created"/> state.
 418         /// </summary>
 419         /// <since_tizen> 3 </since_tizen>
 420         /// <remarks>
 421         /// This must be set before the StartPreview() method.
 422         /// In custom ROI display mode, DisplayRoiArea property must be set before calling this method.
 423         /// </remarks>
 424         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 425         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 426         /// <exception cref="ObjectDisposedException" > The camera already has been disposed of.</exception>
 427         /// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
 428         public Display Display
 429         {
 430             get
 431             {
 432                 return _display;
 433             }
 434
 435             set
 436             {
 437                 ValidateState(CameraState.Created);
 438
 439                 if (value?.Owner != null)
 440                 {
 441                     if (ReferenceEquals(this, value.Owner))
 442                     {
 443                         return;
 444                     }
 445
 446                     throw new ArgumentException("The display has already been assigned to another.");
 447                 }
 448
 449                 SetDisplay(value).ThrowIfFailed("Failed to set the camera display");
 450
 451                 ReplaceDisplay(value);
 452             }
 453         }
 454
 455         CameraError IDisplayable<CameraError>.ApplyEvasDisplay(DisplayType type, ElmSharp.EvasObject evasObject)
 456         {
 457             Debug.Assert(_disposed == false);
 458             ValidationUtil.ValidateEnum(typeof(DisplayType), type, nameof(type));
 459
 460             return CameraDisplay.SetTarget(GetHandle(), type, evasObject);
 461         }
 462
 463         CameraError IDisplayable<CameraError>.ApplyEcoreWindow(IntPtr windowHandle)
 464         {
 465             throw new NotSupportedException("Camera does not support NUI.Window display.");
 466         }
 467
 468         /// <summary>
 469         /// Gets the state of the camera.
 470         /// </summary>
 471         /// <since_tizen> 3 </since_tizen>
 472         /// <value> None, Created, Preview, Capturing, Captured.</value>
 473         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 474         public CameraState State
 475         {
 476             get
 477             {
 478                 ValidateNotDisposed();
 479
 480                 CameraState val = CameraState.None;
 481
 482                 Native.GetState(_handle, out val).ThrowIfFailed("Failed to get camera state");
 483
 484                 return val;
 485             }
 486         }
 487
 488         /// <summary>
 489         /// The hint for the display reuse.
 490         /// If the hint is set to true, the display will be reused when the camera device is changed with
 491         /// the ChangeDevice method.
 492         /// </summary>
 493         /// <since_tizen> 3 </since_tizen>
 494         /// <exception cref="ArgumentException">In case of invalid parameters.</exception>
 495         /// <exception cref="InvalidOperationException">An invalid state.</exception>
 496         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 497         public bool DisplayReuseHint
 498         {
 499             get
 500             {
 501                 ValidateNotDisposed();
 502
 503                 Native.GetDisplayReuseHint(_handle, out bool val).ThrowIfFailed("Failed to get camera display reuse hint");
 504
 505                 return val;
 506             }
 507
 508             set
 509             {
 510                 ValidateState(CameraState.Preview);
 511
 512                 Native.SetDisplayReuseHint(_handle, value).ThrowIfFailed("Failed to set display reuse hint.");
 513             }
 514         }
 515
 516         /// <summary>
 517         /// Gets the facing direction of the camera module.
 518         /// </summary>
 519         /// <since_tizen> 3 </since_tizen>
 520         /// <value>A <see cref="CameraFacingDirection"/> that specifies the facing direction of the camera device.</value>
 521         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 522         public CameraFacingDirection Direction
 523         {
 524             get
 525             {
 526                 ValidateNotDisposed();
 527
 528                 Native.GetFacingDirection(_handle, out var val).ThrowIfFailed("Failed to get camera direction");
 529
 530                 return val;
 531             }
 532         }
 533
 534         /// <summary>
 535         /// Gets the camera device count.
 536         /// </summary>
 537         /// <since_tizen> 3 </since_tizen>
 538         /// <value>This returns 2, if the device supports primary and secondary cameras.
 539         /// Otherwise 1, if the device only supports primary camera.</value>
 540         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 541         public int CameraCount
 542         {
 543             get
 544             {
 545                 ValidateNotDisposed();
 546
 547                 Native.GetDeviceCount(_handle, out int val).ThrowIfFailed("Failed to get camera device count");
 548
 549                 return val;
 550             }
 551         }
 552         #endregion Properties
 553
 554         #region Methods
 555         /// <summary>
 556         /// Changes the camera device.
 557         /// </summary>
 558         /// <param name="device">The hardware camera to access.</param>
 559         /// <since_tizen> 3 </since_tizen>
 560         /// <feature> http://tizen.org/feature/camera </feature>
 561         /// <remarks>
 562         /// If display reuse is set using <see cref="DisplayReuseHint"/>
 563         /// before stopping the preview, the display will be reused and last frame on the display
 564         /// can be kept even though camera device is changed.
 565         /// The camera must be in the <see cref="CameraState.Created"/>.
 566         /// </remarks>
 567         /// <exception cref="ArgumentException">In case of invalid parameters.</exception>
 568         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 569         /// <exception cref="NotSupportedException">In case of the ChangeDevice feature is not supported.</exception>
 570         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 571         public void ChangeDevice(CameraDevice device)
 572         {
 573             ValidateState(CameraState.Created);
 574             ValidationUtil.ValidateEnum(typeof(CameraDevice), device, nameof(device));
 575
 576             Native.ChangeDevice(_handle, device).ThrowIfFailed("Failed to change the camera device");
 577         }
 578
 579         /// <summary>
 580         /// Gets the device state.
 581         /// </summary>
 582         /// <param name="device">The device to get the state.</param>
 583         /// <returns>Returns the state of the camera device.</returns>
 584         /// <since_tizen> 4 </since_tizen>
 585         /// <feature> http://tizen.org/feature/camera </feature>
 586         /// <exception cref="ArgumentException">In case of invalid parameters.</exception>
 587         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 588         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 589         public static CameraDeviceState GetDeviceState(CameraDevice device)
 590         {
 591             ValidationUtil.ValidateEnum(typeof(CameraDevice), device, nameof(device));
 592
 593             Native.GetDeviceState(device, out var val).ThrowIfFailed("Failed to get the camera device state.");
 594
 595             return val;
 596         }
 597
 598         /// <summary>
 599         /// Gets the flash state.
 600         /// </summary>
 601         /// <param name="device">The device to get the state.</param>
 602         /// <returns>Returns the flash state of the camera device.</returns>
 603         /// <since_tizen> 3 </since_tizen>
 604         /// <feature> http://tizen.org/feature/camera </feature>
 605         /// <exception cref="ArgumentException">In case of invalid parameters.</exception>
 606         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 607         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 608         public static CameraFlashState GetFlashState(CameraDevice device)
 609         {
 610             ValidationUtil.ValidateEnum(typeof(CameraDevice), device, nameof(device));
 611
 612             Native.GetFlashState(device, out var val).ThrowIfFailed("Failed to get camera flash state");
 613
 614             return val;
 615         }
 616
 617         /// <summary>
 618         /// Starts capturing and drawing preview frames on the screen.
 619         /// The display property must be set using <see cref="Display"/> before using this method.
 620         /// If needed set fps <see cref="CameraSettings.PreviewFps"/>, preview resolution
 621         /// <see cref="CameraSettings.PreviewResolution"/>, or preview format <see cref="CameraSettings.PreviewPixelFormat"/>
 622         /// before using this method.
 623         /// The camera must be in the <see cref="CameraState.Created"/> or the <see cref="CameraState.Captured"/> state.
 624         /// </summary>
 625         /// <since_tizen> 3 </since_tizen>
 626         /// <privilege> http://tizen.org/privilege/camera </privilege>
 627         /// <feature> http://tizen.org/feature/camera </feature>
 628         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 629         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 630         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 631         /// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
 632         public void StartPreview()
 633         {
 634             ValidateState(CameraState.Created, CameraState.Captured);
 635
 636             Native.StartPreview(_handle).ThrowIfFailed("Failed to start the camera preview.");
 637
 638             // Update by StateChangedCallback can be delayed for dozens of milliseconds.
 639             SetState(CameraState.Preview);
 640         }
 641
 642         /// <summary>
 643         /// Stops capturing and drawing preview frames on the screen.
 644         /// The camera must be in the <see cref="CameraState.Preview"/> state.
 645         /// </summary>
 646         /// <since_tizen> 3 </since_tizen>
 647         /// <privilege> http://tizen.org/privilege/camera </privilege>
 648         /// <feature> http://tizen.org/feature/camera </feature>
 649         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 650         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 651         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 652         /// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
 653         public void StopPreview()
 654         {
 655             ValidateState(CameraState.Preview);
 656
 657             Native.StopPreview(_handle).ThrowIfFailed("Failed to stop the camera preview.");
 658
 659             SetState(CameraState.Created);
 660         }
 661
 662         /// <summary>
 663         /// Starts capturing of still images.
 664         /// EventHandler must be set for capturing using <see cref="Capturing"/>
 665         /// and for completed using <see cref="CaptureCompleted"/> before calling this method.
 666         /// The camera must be in the <see cref="CameraState.Preview"/> state.
 667         /// </summary>
 668         /// <since_tizen> 3 </since_tizen>
 669         /// <privilege> http://tizen.org/privilege/camera </privilege>
 670         /// <feature> http://tizen.org/feature/camera </feature>
 671         /// <remarks>
 672         /// This function causes the transition of the camera state from capturing to captured
 673         /// automatically and the corresponding EventHandlers will be invoked.
 674         /// The preview should be restarted by calling the <see cref="StartPreview"/> method after capture is completed.
 675         /// </remarks>
 676         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 677         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 678         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 679         /// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
 680         public void StartCapture()
 681         {
 682             ValidateState(CameraState.Preview);
 683
 684             Native.StartCapture(_handle, _capturingCallback, _captureCompletedCallback, IntPtr.Zero).
 685                 ThrowIfFailed("Failed to start the camera capture.");
 686
 687             SetState(CameraState.Capturing);
 688         }
 689
 690         /// <summary>
 691         /// Starts continuously capturing still images.
 692         /// EventHandler must be set for capturing using <see cref="Capturing"/>
 693         /// and for completed using <see cref="CaptureCompleted"/> before calling this method.
 694         /// The camera must be in the <see cref="CameraState.Preview"/> state.
 695         /// </summary>
 696         /// <param name="count">The number of still images.</param>
 697         /// <param name="interval">The interval of the capture(milliseconds).</param>
 698         /// <param name="cancellationToken">The cancellation token to cancel capturing.</param>
 699         /// <seealso cref="CancellationToken"/>
 700         /// <since_tizen> 3 </since_tizen>
 701         /// <privilege> http://tizen.org/privilege/camera </privilege>
 702         /// <feature> http://tizen.org/feature/camera </feature>
 703         /// <remarks>
 704         /// If this is not supported, zero shutter lag occurs. The capture resolution could be
 705         /// changed to the preview resolution. This function causes the transition of the camera state
 706         /// from capturing to captured automatically and the corresponding Eventhandlers will be invoked.
 707         /// Each captured image will be delivered through Eventhandler set using the <see cref="Capturing"/> event.
 708         /// The preview should be restarted by calling the <see cref="StartPreview"/> method after capture is completed.
 709         /// </remarks>
 710         /// <exception cref="ArgumentOutOfRangeException">In case of invalid parameters.</exception>
 711         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 712         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 713         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 714         /// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
 715         public void StartCapture(int count, int interval, CancellationToken cancellationToken)
 716         {
 717             ValidateState(CameraState.Preview);
 718
 719             if (count < 2)
 720             {
 721                 throw new ArgumentOutOfRangeException(nameof(count), count, $"{nameof(count)} should be greater than one.");
 722             }
 723
 724             if (interval < 0)
 725             {
 726                 throw new ArgumentOutOfRangeException(nameof(interval), interval, $"{nameof(interval)} should be greater than or equal to zero.");
 727             }
 728
 729             //Handle CancellationToken
 730             if (cancellationToken != CancellationToken.None)
 731             {
 732                 cancellationToken.Register(() =>
 733                 {
 734                     Native.StopContinuousCapture(_handle).ThrowIfFailed("Failed to cancel the continuous capture");
 735                     SetState(CameraState.Captured);
 736                 });
 737             }
 738
 739             Native.StartContinuousCapture(_handle, count, interval, _capturingCallback, _captureCompletedCallback, IntPtr.Zero).
 740                 ThrowIfFailed("Failed to start the continuous capture.");
 741
 742             SetState(CameraState.Capturing);
 743         }
 744
 745         /// <summary>
 746         /// Starts camera auto-focusing, asynchronously.
 747         /// The camera must be in the <see cref="CameraState.Preview"/> or the <see cref="CameraState.Captured"/> state.
 748         /// </summary>
 749         /// <param name="continuous">Continuous auto focus.</param>
 750         /// <since_tizen> 3 </since_tizen>
 751         /// <privilege> http://tizen.org/privilege/camera </privilege>
 752         /// <feature> http://tizen.org/feature/camera </feature>
 753         /// <remarks>
 754         /// If continuous status is true, the camera continuously tries to focus.
 755         /// </remarks>
 756         /// <exception cref="ArgumentException">In case of invalid parameters.</exception>
 757         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 758         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 759         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 760         /// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
 761         public void StartFocusing(bool continuous)
 762         {
 763             ValidateState(CameraState.Preview, CameraState.Captured);
 764
 765             Native.StartFocusing(_handle, continuous).ThrowIfFailed("Failed to cancel the camera focus.");
 766         }
 767
 768         /// <summary>
 769         /// Stops camera auto focusing.
 770         /// The camera must be in the <see cref="CameraState.Preview"/> or the <see cref="CameraState.Captured"/> state.
 771         /// </summary>
 772         /// <since_tizen> 3 </since_tizen>
 773         /// <privilege> http://tizen.org/privilege/camera </privilege>
 774         /// <feature> http://tizen.org/feature/camera </feature>
 775         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 776         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 777         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 778         /// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
 779         public void StopFocusing()
 780         {
 781             ValidateState(CameraState.Preview, CameraState.Captured);
 782
 783             Native.CancelFocusing(_handle).ThrowIfFailed("Failed to cancel the camera focus.");
 784         }
 785
 786         /// <summary>
 787         /// Starts face detection.
 788         /// The camera must be in the <see cref="CameraState.Preview"/> state.
 789         /// </summary>
 790         /// <since_tizen> 3 </since_tizen>
 791         /// <privilege> http://tizen.org/privilege/camera </privilege>
 792         /// <feature> http://tizen.org/feature/camera </feature>
 793         /// <remarks>
 794         /// This should be called after <see cref="StartPreview"/> is started.
 795         /// The Eventhandler set using <see cref="FaceDetected"/> is invoked when the face is detected in the preview frame.
 796         /// Internally, it starts continuously focus and focusing on the detected face.
 797         /// </remarks>
 798         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 799         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 800         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 801         /// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
 802         public void StartFaceDetection()
 803         {
 804             ValidateState(CameraState.Preview);
 805
 806             _faceDetectedCallback = (IntPtr faces, int count, IntPtr userData) =>
 807             {
 808                 var result = new List<FaceDetectionData>();
 809                 IntPtr current = faces;
 810
 811                 for (int i = 0; i < count; i++)
 812                 {
 813                     result.Add(new FaceDetectionData(current));
 814                     current = IntPtr.Add(current, Marshal.SizeOf<Native.DetectedFaceStruct>());
 815                 }
 816
 817                 FaceDetected?.Invoke(this, new FaceDetectedEventArgs(result));
 818             };
 819
 820             Native.StartFaceDetection(_handle, _faceDetectedCallback, IntPtr.Zero).
 821                 ThrowIfFailed("Failed to start face detection");
 822         }
 823
 824         /// <summary>
 825         /// Stops face detection.
 826         /// </summary>
 827         /// <since_tizen> 3 </since_tizen>
 828         /// <privilege> http://tizen.org/privilege/camera </privilege>
 829         /// <feature> http://tizen.org/feature/camera </feature>
 830         /// <exception cref="InvalidOperationException">In case of any invalid operations.</exception>
 831         /// <exception cref="NotSupportedException">In case of this feature is not supported.</exception>
 832         /// <exception cref="ObjectDisposedException">The camera already has been disposed of.</exception>
 833         /// <exception cref="UnauthorizedAccessException">In case of access to the resources cannot be granted.</exception>
 834         public void StopFaceDetection()
 835         {
 836             ValidateNotDisposed();
 837
 838             if (_faceDetectedCallback == null)
 839             {
 840                 throw new InvalidOperationException("The face detection is not started.");
 841             }
 842
 843             Native.StopFaceDetection(_handle).ThrowIfFailed("Failed to stop the face detection.");
 844
 845             _faceDetectedCallback = null;
 846         }
 847         #endregion Methods
 848
 849         #region Callback registrations
 850         private void RegisterCallbacks()
 851         {
 852             RegisterErrorCallback();
 853             RegisterFocusStateChanged();
 854             RegisterInterruptStartedCallback();
 855             RegisterInterruptedCallback();
 856             RegisterStateChangedCallback();
 857
 858             //Define capturing callback
 859             _capturingCallback = (IntPtr main, IntPtr postview, IntPtr thumbnail, IntPtr userData) =>
 860             {
 861                 Capturing?.Invoke(this, new CameraCapturingEventArgs(new StillImage(main),
 862                     postview == IntPtr.Zero ? null : new StillImage(postview),
 863                     thumbnail == IntPtr.Zero ? null : new StillImage(thumbnail)));
 864             };
 865
 866             //Define captureCompleted callback
 867             _captureCompletedCallback = _ =>
 868             {
 869                 SetState(CameraState.Captured);
 870                 CaptureCompleted?.Invoke(this, EventArgs.Empty);
 871             };
 872         }
 873
 874         private void RegisterInterruptStartedCallback()
 875         {
 876             _interruptStartedCallback = (CameraPolicy policy, CameraState state, IntPtr userData) =>
 877             {
 878                 InterruptStarted?.Invoke(this, new CameraInterruptStartedEventArgs(policy, state));
 879             };
 880
 881             Native.SetInterruptStartedCallback(_handle, _interruptStartedCallback, IntPtr.Zero).
 882                 ThrowIfFailed("Failed to set interrupt callback");
 883         }
 884
 885         private void RegisterInterruptedCallback()
 886         {
 887             _interruptedCallback = (CameraPolicy policy, CameraState previous, CameraState current, IntPtr userData) =>
 888             {
 889                 Interrupted?.Invoke(this, new CameraInterruptedEventArgs(policy, previous, current));
 890             };
 891
 892             Native.SetInterruptedCallback(_handle, _interruptedCallback, IntPtr.Zero).
 893                 ThrowIfFailed("Failed to set interrupt callback");
 894         }
 895
 896         private void RegisterErrorCallback()
 897         {
 898             _errorCallback = (CameraErrorCode error, CameraState current, IntPtr userData) =>
 899             {
 900                 ErrorOccurred?.Invoke(this, new CameraErrorOccurredEventArgs(error, current));
 901             };
 902
 903             Native.SetErrorCallback(_handle, _errorCallback, IntPtr.Zero).ThrowIfFailed("Setting error callback failed");
 904         }
 905
 906         private void RegisterStateChangedCallback()
 907         {
 908             _stateChangedCallback = (CameraState previous, CameraState current, bool byPolicy, IntPtr _) =>
 909             {
 910                 SetState(current);
 911                 Log.Info(CameraLog.Tag, "Camera state changed " + previous.ToString() + " -> " + current.ToString());
 912                 StateChanged?.Invoke(this, new CameraStateChangedEventArgs(previous, current, byPolicy));
 913             };
 914
 915             Native.SetStateChangedCallback(_handle, _stateChangedCallback, IntPtr.Zero).
 916                 ThrowIfFailed("Setting state changed callback failed");
 917         }
 918
 919         private static void RegisterDeviceStateChangedCallback()
 920         {
 921             _deviceStateChangedCallback = (CameraDevice device, CameraDeviceState state, IntPtr userData) =>
 922             {
 923                 _deviceStateChanged?.Invoke(null, new CameraDeviceStateChangedEventArgs(device, state));
 924             };
 925
 926             Native.SetDeviceStateChangedCallback(_deviceStateChangedCallback, IntPtr.Zero, out _deviceStateCallbackId).
 927                 ThrowIfFailed("Failed to set device state changed callback");
 928
 929             Log.Info(CameraLog.Tag, "add callbackId " + _deviceStateCallbackId.ToString());
 930         }
 931
 932         private static void UnregisterDeviceStateChangedCallback()
 933         {
 934             Native.UnsetDeviceStateChangedCallback(_deviceStateCallbackId).
 935                 ThrowIfFailed("Unsetting device state changed callback failed");
 936
 937             _deviceStateChangedCallback = null;
 938             _deviceStateCallbackId = 0;
 939         }
 940
 941         private void RegisterFocusStateChanged()
 942         {
 943             _focusStateChangedCallback = (CameraFocusState state, IntPtr userData) =>
 944             {
 945                 FocusStateChanged?.Invoke(this, new CameraFocusStateChangedEventArgs(state));
 946             };
 947
 948             Native.SetFocusStateChangedCallback(_handle, _focusStateChangedCallback, IntPtr.Zero).
 949                 ThrowIfFailed("Setting focus changed callback failed");
 950         }
 951
 952         private void RegisterHdrCaptureProgress()
 953         {
 954             _hdrCaptureProgressCallback = (int percent, IntPtr userData) =>
 955             {
 956                 _hdrCaptureProgress?.Invoke(this, new HdrCaptureProgressEventArgs(percent));
 957             };
 958
 959             Native.SetHdrCaptureProgressCallback(_handle, _hdrCaptureProgressCallback, IntPtr.Zero).
 960                 ThrowIfFailed("Setting Hdr capture progress callback failed");
 961         }
 962
 963         private void UnregisterHdrCaptureProgress()
 964         {
 965             Native.UnsetHdrCaptureProgressCallback(_handle).
 966                 ThrowIfFailed("Unsetting hdr capture progress is failed");
 967
 968             _hdrCaptureProgressCallback = null;
 969         }
 970
 971         private void RegisterPreviewCallback()
 972         {
 973             _previewCallback = (IntPtr frame, IntPtr userData) =>
 974             {
 975                 _preview?.Invoke(this, new PreviewEventArgs(new PreviewFrame(frame)));
 976             };
 977
 978             Native.SetPreviewCallback(_handle, _previewCallback, IntPtr.Zero).
 979                 ThrowIfFailed("Setting preview callback failed");
 980         }
 981
 982         private void UnregisterPreviewCallback()
 983         {
 984             Native.UnsetPreviewCallback(_handle).ThrowIfFailed("Unsetting preview callback failed");
 985
 986             _previewCallback = null;
 987         }
 988
 989         private void RegisterMediaPacketPreviewCallback()
 990         {
 991             _mediaPacketPreviewCallback = (IntPtr mediaPacket, IntPtr userData) =>
 992             {
 993                 MediaPacket packet = MediaPacket.From(mediaPacket);
 994
 995                 var eventHandler = _mediaPacketPreview;
 996
 997                 if (eventHandler != null)
 998                 {
 999                     eventHandler.Invoke(this, new MediaPacketPreviewEventArgs(packet));
1000                 }
1001
1002                 packet.Dispose();
1003             };
1004
1005             Native.SetMediaPacketPreviewCallback(_handle, _mediaPacketPreviewCallback, IntPtr.Zero).
1006                 ThrowIfFailed("Setting media packet preview callback failed");
1007         }
1008
1009         private void UnregisterMediaPacketPreviewCallback()
1010         {
1011             Native.UnsetMediaPacketPreviewCallback(_handle).
1012                 ThrowIfFailed("Unsetting media packet preview callback failed");
1013
1014             _mediaPacketPreviewCallback = null;
1015         }
1016         #endregion Callback registrations
1017     }
1018 }