videoio.hpp

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#ifndef __OPENCV_VIDEOIO_HPP__
#define __OPENCV_VIDEOIO_HPP__

#include "opencv2/core.hpp"

/**
  @defgroup videoio Media I/O
  @{
    @defgroup videoio_c C API
    @defgroup videoio_ios iOS glue
    @defgroup videoio_winrt WinRT glue
  @}
*/

////////////////////////////////// video io /////////////////////////////////

typedef struct CvCapture CvCapture;
typedef struct CvVideoWriter CvVideoWriter;

namespace cv
{

//! @addtogroup videoio
//! @{

/** @brief Capture API backends.

Select preferred API for a capture object.
To be used in the constructor VideoCapture::VideoCapture or VideoCapture::open

@note Backends are available only if they have been built with your OpenCV binaries.<br>
Check in <tt>cvconfig.h</tt> to know which APIs are currently available (e.g. <tt>HAVE_MSMF, HAVE_VFW, HAVE_LIBV4L</tt>).
To enable/disable APIs, you have to:
  1. re-configure OpenCV using the appropriates CMake switches
     (e.g. <tt>-DWITH_MSMF=ON -DWITH_VFW=ON ... </tt>) or checking related switch in cmake-gui
  2. rebuild OpenCV itself
*/
enum { CAP_ANY          = 0,            //!< Auto detect
       CAP_VFW          = 200,          //!< Video For Windows (platform native)
       CAP_V4L          = 200,          //!< V4L/V4L2 capturing support via libv4l
       CAP_V4L2         = CAP_V4L,      //!< Same as CAP_V4L
       CAP_FIREWIRE     = 300,          //!< IEEE 1394 drivers
       CAP_FIREWARE     = CAP_FIREWIRE, //!< Same as CAP_FIREWIRE
       CAP_IEEE1394     = CAP_FIREWIRE, //!< Same as CAP_FIREWIRE
       CAP_DC1394       = CAP_FIREWIRE, //!< Same as CAP_FIREWIRE
       CAP_CMU1394      = CAP_FIREWIRE, //!< Same as CAP_FIREWIRE
       CAP_QT           = 500,          //!< QuickTime
       CAP_UNICAP       = 600,          //!< Unicap drivers
       CAP_DSHOW        = 700,          //!< DirectShow (via videoInput)
       CAP_PVAPI        = 800,          //!< PvAPI, Prosilica GigE SDK
       CAP_OPENNI       = 900,          //!< OpenNI (for Kinect)
       CAP_OPENNI_ASUS  = 910,          //!< OpenNI (for Asus Xtion)
       CAP_ANDROID      = 1000,         //!< Android - not used
       CAP_XIAPI        = 1100,         //!< XIMEA Camera API
       CAP_AVFOUNDATION = 1200,         //!< AVFoundation framework for iOS (OS X Lion will have the same API)
       CAP_GIGANETIX    = 1300,         //!< Smartek Giganetix GigEVisionSDK
       CAP_MSMF         = 1400,         //!< Microsoft Media Foundation (via videoInput)
       CAP_WINRT        = 1410,         //!< Microsoft Windows Runtime using Media Foundation
       CAP_INTELPERC    = 1500,         //!< Intel Perceptual Computing SDK
       CAP_OPENNI2      = 1600,         //!< OpenNI2 (for Kinect)
       CAP_OPENNI2_ASUS = 1610,         //!< OpenNI2 (for Asus Xtion and Occipital Structure sensors)
       CAP_GPHOTO2      = 1700,         //!< gPhoto2 connection
       CAP_GSTREAMER    = 1800,         //!< GStreamer
       CAP_FFMPEG       = 1900,         //!< FFMPEG
       CAP_IMAGES       = 2000          //!< OpenCV Image Sequence (e.g. img_%02d.jpg)
     };

//! generic properties (based on DC1394 properties)
enum { CAP_PROP_POS_MSEC       =0, //!< Current position of the video file in milliseconds.
       CAP_PROP_POS_FRAMES     =1, //!< 0-based index of the frame to be decoded/captured next.
       CAP_PROP_POS_AVI_RATIO  =2, //!< Relative position of the video file: 0=start of the film, 1=end of the film.
       CAP_PROP_FRAME_WIDTH    =3, //!< Width of the frames in the video stream.
       CAP_PROP_FRAME_HEIGHT   =4, //!< Height of the frames in the video stream.
       CAP_PROP_FPS            =5, //!< Frame rate.
       CAP_PROP_FOURCC         =6, //!< 4-character code of codec. see VideoWriter::fourcc .
       CAP_PROP_FRAME_COUNT    =7, //!< Number of frames in the video file.
       CAP_PROP_FORMAT         =8, //!< Format of the %Mat objects returned by VideoCapture::retrieve().
       CAP_PROP_MODE           =9, //!< Backend-specific value indicating the current capture mode.
       CAP_PROP_BRIGHTNESS    =10, //!< Brightness of the image (only for cameras).
       CAP_PROP_CONTRAST      =11, //!< Contrast of the image (only for cameras).
       CAP_PROP_SATURATION    =12, //!< Saturation of the image (only for cameras).
       CAP_PROP_HUE           =13, //!< Hue of the image (only for cameras).
       CAP_PROP_GAIN          =14, //!< Gain of the image (only for cameras).
       CAP_PROP_EXPOSURE      =15, //!< Exposure (only for cameras).
       CAP_PROP_CONVERT_RGB   =16, //!< Boolean flags indicating whether images should be converted to RGB.
       CAP_PROP_WHITE_BALANCE_BLUE_U =17, //!< Currently unsupported.
       CAP_PROP_RECTIFICATION =18, //!< Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently).
       CAP_PROP_MONOCHROME    =19,
       CAP_PROP_SHARPNESS     =20,
       CAP_PROP_AUTO_EXPOSURE =21, //!< DC1394: exposure control done by camera, user can adjust reference level using this feature.
       CAP_PROP_GAMMA         =22,
       CAP_PROP_TEMPERATURE   =23,
       CAP_PROP_TRIGGER       =24,
       CAP_PROP_TRIGGER_DELAY =25,
       CAP_PROP_WHITE_BALANCE_RED_V =26,
       CAP_PROP_ZOOM          =27,
       CAP_PROP_FOCUS         =28,
       CAP_PROP_GUID          =29,
       CAP_PROP_ISO_SPEED     =30,
       CAP_PROP_BACKLIGHT     =32,
       CAP_PROP_PAN           =33,
       CAP_PROP_TILT          =34,
       CAP_PROP_ROLL          =35,
       CAP_PROP_IRIS          =36,
       CAP_PROP_SETTINGS      =37,
       CAP_PROP_BUFFERSIZE    =38,
       CAP_PROP_AUTOFOCUS     =39
     };


//! @brief Generic camera output modes.
//! @note Currently, these are supported through the libv4l interface only.
enum { CAP_MODE_BGR  = 0, //!< BGR24 (default)
       CAP_MODE_RGB  = 1, //!< RGB24
       CAP_MODE_GRAY = 2, //!< Y8
       CAP_MODE_YUYV = 3  //!< YUYV
     };


/** @brief DC1394 only

modes of the controlling registers (can be: auto, manual, auto single push, absolute Latter allowed with any other mode)
every feature can have only one mode turned on at a time
*/
enum { CAP_PROP_DC1394_OFF                = -4, //!< turn the feature off (not controlled manually nor automatically).
       CAP_PROP_DC1394_MODE_MANUAL        = -3, //!< set automatically when a value of the feature is set by the user.
       CAP_PROP_DC1394_MODE_AUTO          = -2,
       CAP_PROP_DC1394_MODE_ONE_PUSH_AUTO = -1,
       CAP_PROP_DC1394_MAX                = 31
     };


//! OpenNI map generators
enum { CAP_OPENNI_DEPTH_GENERATOR = 1 << 31,
       CAP_OPENNI_IMAGE_GENERATOR = 1 << 30,
       CAP_OPENNI_IR_GENERATOR    = 1 << 29,
       CAP_OPENNI_GENERATORS_MASK = CAP_OPENNI_DEPTH_GENERATOR + CAP_OPENNI_IMAGE_GENERATOR + CAP_OPENNI_IR_GENERATOR
     };

//! Properties of cameras available through OpenNI interfaces
enum { CAP_PROP_OPENNI_OUTPUT_MODE       = 100,
       CAP_PROP_OPENNI_FRAME_MAX_DEPTH   = 101, //!< In mm
       CAP_PROP_OPENNI_BASELINE          = 102, //!< In mm
       CAP_PROP_OPENNI_FOCAL_LENGTH      = 103, //!< In pixels
       CAP_PROP_OPENNI_REGISTRATION      = 104, //!< Flag that synchronizes the remapping depth map to image map
                                                //!< by changing depth generator's view point (if the flag is "on") or
                                                //!< sets this view point to its normal one (if the flag is "off").
       CAP_PROP_OPENNI_REGISTRATION_ON   = CAP_PROP_OPENNI_REGISTRATION,
       CAP_PROP_OPENNI_APPROX_FRAME_SYNC = 105,
       CAP_PROP_OPENNI_MAX_BUFFER_SIZE   = 106,
       CAP_PROP_OPENNI_CIRCLE_BUFFER     = 107,
       CAP_PROP_OPENNI_MAX_TIME_DURATION = 108,
       CAP_PROP_OPENNI_GENERATOR_PRESENT = 109,
       CAP_PROP_OPENNI2_SYNC             = 110,
       CAP_PROP_OPENNI2_MIRROR           = 111
     };

//! OpenNI shortcuts
enum { CAP_OPENNI_IMAGE_GENERATOR_PRESENT         = CAP_OPENNI_IMAGE_GENERATOR + CAP_PROP_OPENNI_GENERATOR_PRESENT,
       CAP_OPENNI_IMAGE_GENERATOR_OUTPUT_MODE     = CAP_OPENNI_IMAGE_GENERATOR + CAP_PROP_OPENNI_OUTPUT_MODE,
       CAP_OPENNI_DEPTH_GENERATOR_PRESENT         = CAP_OPENNI_DEPTH_GENERATOR + CAP_PROP_OPENNI_GENERATOR_PRESENT,
       CAP_OPENNI_DEPTH_GENERATOR_BASELINE        = CAP_OPENNI_DEPTH_GENERATOR + CAP_PROP_OPENNI_BASELINE,
       CAP_OPENNI_DEPTH_GENERATOR_FOCAL_LENGTH    = CAP_OPENNI_DEPTH_GENERATOR + CAP_PROP_OPENNI_FOCAL_LENGTH,
       CAP_OPENNI_DEPTH_GENERATOR_REGISTRATION    = CAP_OPENNI_DEPTH_GENERATOR + CAP_PROP_OPENNI_REGISTRATION,
       CAP_OPENNI_DEPTH_GENERATOR_REGISTRATION_ON = CAP_OPENNI_DEPTH_GENERATOR_REGISTRATION,
       CAP_OPENNI_IR_GENERATOR_PRESENT            = CAP_OPENNI_IR_GENERATOR + CAP_PROP_OPENNI_GENERATOR_PRESENT,
     };

//! OpenNI data given from depth generator
enum { CAP_OPENNI_DEPTH_MAP         = 0, //!< Depth values in mm (CV_16UC1)
       CAP_OPENNI_POINT_CLOUD_MAP   = 1, //!< XYZ in meters (CV_32FC3)
       CAP_OPENNI_DISPARITY_MAP     = 2, //!< Disparity in pixels (CV_8UC1)
       CAP_OPENNI_DISPARITY_MAP_32F = 3, //!< Disparity in pixels (CV_32FC1)
       CAP_OPENNI_VALID_DEPTH_MASK  = 4, //!< CV_8UC1

       CAP_OPENNI_BGR_IMAGE         = 5, //!< Data given from RGB image generator
       CAP_OPENNI_GRAY_IMAGE        = 6, //!< Data given from RGB image generator

       CAP_OPENNI_IR_IMAGE          = 7  //!< Data given from IR image generator
     };

//! Supported output modes of OpenNI image generator
enum { CAP_OPENNI_VGA_30HZ  = 0,
       CAP_OPENNI_SXGA_15HZ = 1,
       CAP_OPENNI_SXGA_30HZ = 2,
       CAP_OPENNI_QVGA_30HZ = 3,
       CAP_OPENNI_QVGA_60HZ = 4
     };


//! GStreamer
enum { CAP_PROP_GSTREAMER_QUEUE_LENGTH = 200 //!< Default is 1
     };


//! PVAPI
enum { CAP_PROP_PVAPI_MULTICASTIP           = 300, //!< IP for enable multicast master mode. 0 for disable multicast.
       CAP_PROP_PVAPI_FRAMESTARTTRIGGERMODE = 301, //!< FrameStartTriggerMode: Determines how a frame is initiated.
       CAP_PROP_PVAPI_DECIMATIONHORIZONTAL  = 302, //!< Horizontal sub-sampling of the image.
       CAP_PROP_PVAPI_DECIMATIONVERTICAL    = 303, //!< Vertical sub-sampling of the image.
       CAP_PROP_PVAPI_BINNINGX              = 304, //!< Horizontal binning factor.
       CAP_PROP_PVAPI_BINNINGY              = 305, //!< Vertical binning factor.
       CAP_PROP_PVAPI_PIXELFORMAT           = 306  //!< Pixel format.
     };

//! PVAPI: FrameStartTriggerMode
enum { CAP_PVAPI_FSTRIGMODE_FREERUN     = 0,    //!< Freerun
       CAP_PVAPI_FSTRIGMODE_SYNCIN1     = 1,    //!< SyncIn1
       CAP_PVAPI_FSTRIGMODE_SYNCIN2     = 2,    //!< SyncIn2
       CAP_PVAPI_FSTRIGMODE_FIXEDRATE   = 3,    //!< FixedRate
       CAP_PVAPI_FSTRIGMODE_SOFTWARE    = 4     //!< Software
     };

//! PVAPI: DecimationHorizontal, DecimationVertical
enum { CAP_PVAPI_DECIMATION_OFF       = 1,    //!< Off
       CAP_PVAPI_DECIMATION_2OUTOF4   = 2,    //!< 2 out of 4 decimation
       CAP_PVAPI_DECIMATION_2OUTOF8   = 4,    //!< 2 out of 8 decimation
       CAP_PVAPI_DECIMATION_2OUTOF16  = 8     //!< 2 out of 16 decimation
     };

//! PVAPI: PixelFormat
enum { CAP_PVAPI_PIXELFORMAT_MONO8    = 1,    //!< Mono8
       CAP_PVAPI_PIXELFORMAT_MONO16   = 2,    //!< Mono16
       CAP_PVAPI_PIXELFORMAT_BAYER8   = 3,    //!< Bayer8
       CAP_PVAPI_PIXELFORMAT_BAYER16  = 4,    //!< Bayer16
       CAP_PVAPI_PIXELFORMAT_RGB24    = 5,    //!< Rgb24
       CAP_PVAPI_PIXELFORMAT_BGR24    = 6,    //!< Bgr24
       CAP_PVAPI_PIXELFORMAT_RGBA32   = 7,    //!< Rgba32
       CAP_PVAPI_PIXELFORMAT_BGRA32   = 8,    //!< Bgra32
     };

//! Properties of cameras available through XIMEA SDK interface
enum { CAP_PROP_XI_DOWNSAMPLING                                 = 400, //!< Change image resolution by binning or skipping.
       CAP_PROP_XI_DATA_FORMAT                                  = 401, //!< Output data format.
       CAP_PROP_XI_OFFSET_X                                     = 402, //!< Horizontal offset from the origin to the area of interest (in pixels).
       CAP_PROP_XI_OFFSET_Y                                     = 403, //!< Vertical offset from the origin to the area of interest (in pixels).
       CAP_PROP_XI_TRG_SOURCE                                   = 404, //!< Defines source of trigger.
       CAP_PROP_XI_TRG_SOFTWARE                                 = 405, //!< Generates an internal trigger. PRM_TRG_SOURCE must be set to TRG_SOFTWARE.
       CAP_PROP_XI_GPI_SELECTOR                                 = 406, //!< Selects general purpose input.
       CAP_PROP_XI_GPI_MODE                                     = 407, //!< Set general purpose input mode.
       CAP_PROP_XI_GPI_LEVEL                                    = 408, //!< Get general purpose level.
       CAP_PROP_XI_GPO_SELECTOR                                 = 409, //!< Selects general purpose output.
       CAP_PROP_XI_GPO_MODE                                     = 410, //!< Set general purpose output mode.
       CAP_PROP_XI_LED_SELECTOR                                 = 411, //!< Selects camera signalling LED.
       CAP_PROP_XI_LED_MODE                                     = 412, //!< Define camera signalling LED functionality.
       CAP_PROP_XI_MANUAL_WB                                    = 413, //!< Calculates White Balance(must be called during acquisition).
       CAP_PROP_XI_AUTO_WB                                      = 414, //!< Automatic white balance.
       CAP_PROP_XI_AEAG                                         = 415, //!< Automatic exposure/gain.
       CAP_PROP_XI_EXP_PRIORITY                                 = 416, //!< Exposure priority (0.5 - exposure 50%, gain 50%).
       CAP_PROP_XI_AE_MAX_LIMIT                                 = 417, //!< Maximum limit of exposure in AEAG procedure.
       CAP_PROP_XI_AG_MAX_LIMIT                                 = 418, //!< Maximum limit of gain in AEAG procedure.
       CAP_PROP_XI_AEAG_LEVEL                                   = 419, //!< Average intensity of output signal AEAG should achieve(in %).
       CAP_PROP_XI_TIMEOUT                                      = 420, //!< Image capture timeout in milliseconds.
       CAP_PROP_XI_EXPOSURE                                     = 421, //!< Exposure time in microseconds.
       CAP_PROP_XI_EXPOSURE_BURST_COUNT                         = 422, //!< Sets the number of times of exposure in one frame.
       CAP_PROP_XI_GAIN_SELECTOR                                = 423, //!< Gain selector for parameter Gain allows to select different type of gains.
       CAP_PROP_XI_GAIN                                         = 424, //!< Gain in dB.
       CAP_PROP_XI_DOWNSAMPLING_TYPE                            = 426, //!< Change image downsampling type.
       CAP_PROP_XI_BINNING_SELECTOR                             = 427, //!< Binning engine selector.
       CAP_PROP_XI_BINNING_VERTICAL                             = 428, //!< Vertical Binning - number of vertical photo-sensitive cells to combine together.
       CAP_PROP_XI_BINNING_HORIZONTAL                           = 429, //!< Horizontal Binning - number of horizontal photo-sensitive cells to combine together.
       CAP_PROP_XI_BINNING_PATTERN                              = 430, //!< Binning pattern type.
       CAP_PROP_XI_DECIMATION_SELECTOR                          = 431, //!< Decimation engine selector.
       CAP_PROP_XI_DECIMATION_VERTICAL                          = 432, //!< Vertical Decimation - vertical sub-sampling of the image - reduces the vertical resolution of the image by the specified vertical decimation factor.
       CAP_PROP_XI_DECIMATION_HORIZONTAL                        = 433, //!< Horizontal Decimation - horizontal sub-sampling of the image - reduces the horizontal resolution of the image by the specified vertical decimation factor.
       CAP_PROP_XI_DECIMATION_PATTERN                           = 434, //!< Decimation pattern type.
       CAP_PROP_XI_TEST_PATTERN_GENERATOR_SELECTOR              = 587, //!< Selects which test pattern generator is controlled by the TestPattern feature.
       CAP_PROP_XI_TEST_PATTERN                                 = 588, //!< Selects which test pattern type is generated by the selected generator.
       CAP_PROP_XI_IMAGE_DATA_FORMAT                            = 435, //!< Output data format.
       CAP_PROP_XI_SHUTTER_TYPE                                 = 436, //!< Change sensor shutter type(CMOS sensor).
       CAP_PROP_XI_SENSOR_TAPS                                  = 437, //!< Number of taps.
       CAP_PROP_XI_AEAG_ROI_OFFSET_X                            = 439, //!< Automatic exposure/gain ROI offset X.
       CAP_PROP_XI_AEAG_ROI_OFFSET_Y                            = 440, //!< Automatic exposure/gain ROI offset Y.
       CAP_PROP_XI_AEAG_ROI_WIDTH                               = 441, //!< Automatic exposure/gain ROI Width.
       CAP_PROP_XI_AEAG_ROI_HEIGHT                              = 442, //!< Automatic exposure/gain ROI Height.
       CAP_PROP_XI_BPC                                          = 445, //!< Correction of bad pixels.
       CAP_PROP_XI_WB_KR                                        = 448, //!< White balance red coefficient.
       CAP_PROP_XI_WB_KG                                        = 449, //!< White balance green coefficient.
       CAP_PROP_XI_WB_KB                                        = 450, //!< White balance blue coefficient.
       CAP_PROP_XI_WIDTH                                        = 451, //!< Width of the Image provided by the device (in pixels).
       CAP_PROP_XI_HEIGHT                                       = 452, //!< Height of the Image provided by the device (in pixels).
       CAP_PROP_XI_REGION_SELECTOR                              = 589, //!< Selects Region in Multiple ROI which parameters are set by width, height, ... ,region mode.
       CAP_PROP_XI_REGION_MODE                                  = 595, //!< Activates/deactivates Region selected by Region Selector.
       CAP_PROP_XI_LIMIT_BANDWIDTH                              = 459, //!< Set/get bandwidth(datarate)(in Megabits).
       CAP_PROP_XI_SENSOR_DATA_BIT_DEPTH                        = 460, //!< Sensor output data bit depth.
       CAP_PROP_XI_OUTPUT_DATA_BIT_DEPTH                        = 461, //!< Device output data bit depth.
       CAP_PROP_XI_IMAGE_DATA_BIT_DEPTH                         = 462, //!< bitdepth of data returned by function xiGetImage.
       CAP_PROP_XI_OUTPUT_DATA_PACKING                          = 463, //!< Device output data packing (or grouping) enabled. Packing could be enabled if output_data_bit_depth > 8 and packing capability is available.
       CAP_PROP_XI_OUTPUT_DATA_PACKING_TYPE                     = 464, //!< Data packing type. Some cameras supports only specific packing type.
       CAP_PROP_XI_IS_COOLED                                    = 465, //!< Returns 1 for cameras that support cooling.
       CAP_PROP_XI_COOLING                                      = 466, //!< Start camera cooling.
       CAP_PROP_XI_TARGET_TEMP                                  = 467, //!< Set sensor target temperature for cooling.
       CAP_PROP_XI_CHIP_TEMP                                    = 468, //!< Camera sensor temperature.
       CAP_PROP_XI_HOUS_TEMP                                    = 469, //!< Camera housing temperature.
       CAP_PROP_XI_HOUS_BACK_SIDE_TEMP                          = 590, //!< Camera housing back side temperature.
       CAP_PROP_XI_SENSOR_BOARD_TEMP                            = 596, //!< Camera sensor board temperature.
       CAP_PROP_XI_CMS                                          = 470, //!< Mode of color management system.
       CAP_PROP_XI_APPLY_CMS                                    = 471, //!< Enable applying of CMS profiles to xiGetImage (see XI_PRM_INPUT_CMS_PROFILE, XI_PRM_OUTPUT_CMS_PROFILE).
       CAP_PROP_XI_IMAGE_IS_COLOR                               = 474, //!< Returns 1 for color cameras.
       CAP_PROP_XI_COLOR_FILTER_ARRAY                           = 475, //!< Returns color filter array type of RAW data.
       CAP_PROP_XI_GAMMAY                                       = 476, //!< Luminosity gamma.
       CAP_PROP_XI_GAMMAC                                       = 477, //!< Chromaticity gamma.
       CAP_PROP_XI_SHARPNESS                                    = 478, //!< Sharpness Strength.
       CAP_PROP_XI_CC_MATRIX_00                                 = 479, //!< Color Correction Matrix element [0][0].
       CAP_PROP_XI_CC_MATRIX_01                                 = 480, //!< Color Correction Matrix element [0][1].
       CAP_PROP_XI_CC_MATRIX_02                                 = 481, //!< Color Correction Matrix element [0][2].
       CAP_PROP_XI_CC_MATRIX_03                                 = 482, //!< Color Correction Matrix element [0][3].
       CAP_PROP_XI_CC_MATRIX_10                                 = 483, //!< Color Correction Matrix element [1][0].
       CAP_PROP_XI_CC_MATRIX_11                                 = 484, //!< Color Correction Matrix element [1][1].
       CAP_PROP_XI_CC_MATRIX_12                                 = 485, //!< Color Correction Matrix element [1][2].
       CAP_PROP_XI_CC_MATRIX_13                                 = 486, //!< Color Correction Matrix element [1][3].
       CAP_PROP_XI_CC_MATRIX_20                                 = 487, //!< Color Correction Matrix element [2][0].
       CAP_PROP_XI_CC_MATRIX_21                                 = 488, //!< Color Correction Matrix element [2][1].
       CAP_PROP_XI_CC_MATRIX_22                                 = 489, //!< Color Correction Matrix element [2][2].
       CAP_PROP_XI_CC_MATRIX_23                                 = 490, //!< Color Correction Matrix element [2][3].
       CAP_PROP_XI_CC_MATRIX_30                                 = 491, //!< Color Correction Matrix element [3][0].
       CAP_PROP_XI_CC_MATRIX_31                                 = 492, //!< Color Correction Matrix element [3][1].
       CAP_PROP_XI_CC_MATRIX_32                                 = 493, //!< Color Correction Matrix element [3][2].
       CAP_PROP_XI_CC_MATRIX_33                                 = 494, //!< Color Correction Matrix element [3][3].
       CAP_PROP_XI_DEFAULT_CC_MATRIX                            = 495, //!< Set default Color Correction Matrix.
       CAP_PROP_XI_TRG_SELECTOR                                 = 498, //!< Selects the type of trigger.
       CAP_PROP_XI_ACQ_FRAME_BURST_COUNT                        = 499, //!< Sets number of frames acquired by burst. This burst is used only if trigger is set to FrameBurstStart.
       CAP_PROP_XI_DEBOUNCE_EN                                  = 507, //!< Enable/Disable debounce to selected GPI.
       CAP_PROP_XI_DEBOUNCE_T0                                  = 508, //!< Debounce time (x * 10us).
       CAP_PROP_XI_DEBOUNCE_T1                                  = 509, //!< Debounce time (x * 10us).
       CAP_PROP_XI_DEBOUNCE_POL                                 = 510, //!< Debounce polarity (pol = 1 t0 - falling edge, t1 - rising edge).
       CAP_PROP_XI_LENS_MODE                                    = 511, //!< Status of lens control interface. This shall be set to XI_ON before any Lens operations.
       CAP_PROP_XI_LENS_APERTURE_VALUE                          = 512, //!< Current lens aperture value in stops. Examples: 2.8, 4, 5.6, 8, 11.
       CAP_PROP_XI_LENS_FOCUS_MOVEMENT_VALUE                    = 513, //!< Lens current focus movement value to be used by XI_PRM_LENS_FOCUS_MOVE in motor steps.
       CAP_PROP_XI_LENS_FOCUS_MOVE                              = 514, //!< Moves lens focus motor by steps set in XI_PRM_LENS_FOCUS_MOVEMENT_VALUE.
       CAP_PROP_XI_LENS_FOCUS_DISTANCE                          = 515, //!< Lens focus distance in cm.
       CAP_PROP_XI_LENS_FOCAL_LENGTH                            = 516, //!< Lens focal distance in mm.
       CAP_PROP_XI_LENS_FEATURE_SELECTOR                        = 517, //!< Selects the current feature which is accessible by XI_PRM_LENS_FEATURE.
       CAP_PROP_XI_LENS_FEATURE                                 = 518, //!< Allows access to lens feature value currently selected by XI_PRM_LENS_FEATURE_SELECTOR.
       CAP_PROP_XI_DEVICE_MODEL_ID                              = 521, //!< Return device model id.
       CAP_PROP_XI_DEVICE_SN                                    = 522, //!< Return device serial number.
       CAP_PROP_XI_IMAGE_DATA_FORMAT_RGB32_ALPHA                = 529, //!< The alpha channel of RGB32 output image format.
       CAP_PROP_XI_IMAGE_PAYLOAD_SIZE                           = 530, //!< Buffer size in bytes sufficient for output image returned by xiGetImage.
       CAP_PROP_XI_TRANSPORT_PIXEL_FORMAT                       = 531, //!< Current format of pixels on transport layer.
       CAP_PROP_XI_SENSOR_CLOCK_FREQ_HZ                         = 532, //!< Sensor clock frequency in Hz.
       CAP_PROP_XI_SENSOR_CLOCK_FREQ_INDEX                      = 533, //!< Sensor clock frequency index. Sensor with selected frequencies have possibility to set the frequency only by this index.
       CAP_PROP_XI_SENSOR_OUTPUT_CHANNEL_COUNT                  = 534, //!< Number of output channels from sensor used for data transfer.
       CAP_PROP_XI_FRAMERATE                                    = 535, //!< Define framerate in Hz.
       CAP_PROP_XI_COUNTER_SELECTOR                             = 536, //!< Select counter.
       CAP_PROP_XI_COUNTER_VALUE                                = 537, //!< Counter status.
       CAP_PROP_XI_ACQ_TIMING_MODE                              = 538, //!< Type of sensor frames timing.
       CAP_PROP_XI_AVAILABLE_BANDWIDTH                          = 539, //!< Calculate and return available interface bandwidth(int Megabits).
       CAP_PROP_XI_BUFFER_POLICY                                = 540, //!< Data move policy.
       CAP_PROP_XI_LUT_EN                                       = 541, //!< Activates LUT.
       CAP_PROP_XI_LUT_INDEX                                    = 542, //!< Control the index (offset) of the coefficient to access in the LUT.
       CAP_PROP_XI_LUT_VALUE                                    = 543, //!< Value at entry LUTIndex of the LUT.
       CAP_PROP_XI_TRG_DELAY                                    = 544, //!< Specifies the delay in microseconds (us) to apply after the trigger reception before activating it.
       CAP_PROP_XI_TS_RST_MODE                                  = 545, //!< Defines how time stamp reset engine will be armed.
       CAP_PROP_XI_TS_RST_SOURCE                                = 546, //!< Defines which source will be used for timestamp reset. Writing this parameter will trigger settings of engine (arming).
       CAP_PROP_XI_IS_DEVICE_EXIST                              = 547, //!< Returns 1 if camera connected and works properly.
       CAP_PROP_XI_ACQ_BUFFER_SIZE                              = 548, //!< Acquisition buffer size in buffer_size_unit. Default bytes.
       CAP_PROP_XI_ACQ_BUFFER_SIZE_UNIT                         = 549, //!< Acquisition buffer size unit in bytes. Default 1. E.g. Value 1024 means that buffer_size is in KiBytes.
       CAP_PROP_XI_ACQ_TRANSPORT_BUFFER_SIZE                    = 550, //!< Acquisition transport buffer size in bytes.
       CAP_PROP_XI_BUFFERS_QUEUE_SIZE                           = 551, //!< Queue of field/frame buffers.
       CAP_PROP_XI_ACQ_TRANSPORT_BUFFER_COMMIT                  = 552, //!< Number of buffers to commit to low level.
       CAP_PROP_XI_RECENT_FRAME                                 = 553, //!< GetImage returns most recent frame.
       CAP_PROP_XI_DEVICE_RESET                                 = 554, //!< Resets the camera to default state.
       CAP_PROP_XI_COLUMN_FPN_CORRECTION                        = 555, //!< Correction of column FPN.
       CAP_PROP_XI_ROW_FPN_CORRECTION                           = 591, //!< Correction of row FPN.
       CAP_PROP_XI_SENSOR_MODE                                  = 558, //!< Current sensor mode. Allows to select sensor mode by one integer. Setting of this parameter affects: image dimensions and downsampling.
       CAP_PROP_XI_HDR                                          = 559, //!< Enable High Dynamic Range feature.
       CAP_PROP_XI_HDR_KNEEPOINT_COUNT                          = 560, //!< The number of kneepoints in the PWLR.
       CAP_PROP_XI_HDR_T1                                       = 561, //!< Position of first kneepoint(in % of XI_PRM_EXPOSURE).
       CAP_PROP_XI_HDR_T2                                       = 562, //!< Position of second kneepoint (in % of XI_PRM_EXPOSURE).
       CAP_PROP_XI_KNEEPOINT1                                   = 563, //!< Value of first kneepoint (% of sensor saturation).
       CAP_PROP_XI_KNEEPOINT2                                   = 564, //!< Value of second kneepoint (% of sensor saturation).
       CAP_PROP_XI_IMAGE_BLACK_LEVEL                            = 565, //!< Last image black level counts. Can be used for Offline processing to recall it.
       CAP_PROP_XI_HW_REVISION                                  = 571, //!< Returns hardware revision number.
       CAP_PROP_XI_DEBUG_LEVEL                                  = 572, //!< Set debug level.
       CAP_PROP_XI_AUTO_BANDWIDTH_CALCULATION                   = 573, //!< Automatic bandwidth calculation.
       CAP_PROP_XI_FFS_FILE_ID                                  = 594, //!< File number.
       CAP_PROP_XI_FFS_FILE_SIZE                                = 580, //!< Size of file.
       CAP_PROP_XI_FREE_FFS_SIZE                                = 581, //!< Size of free camera FFS.
       CAP_PROP_XI_USED_FFS_SIZE                                = 582, //!< Size of used camera FFS.
       CAP_PROP_XI_FFS_ACCESS_KEY                               = 583, //!< Setting of key enables file operations on some cameras.
       CAP_PROP_XI_SENSOR_FEATURE_SELECTOR                      = 585, //!< Selects the current feature which is accessible by XI_PRM_SENSOR_FEATURE_VALUE.
       CAP_PROP_XI_SENSOR_FEATURE_VALUE                         = 586, //!< Allows access to sensor feature value currently selected by XI_PRM_SENSOR_FEATURE_SELECTOR.
     };


//! Properties of cameras available through AVFOUNDATION interface
enum { CAP_PROP_IOS_DEVICE_FOCUS        = 9001,
       CAP_PROP_IOS_DEVICE_EXPOSURE     = 9002,
       CAP_PROP_IOS_DEVICE_FLASH        = 9003,
       CAP_PROP_IOS_DEVICE_WHITEBALANCE = 9004,
       CAP_PROP_IOS_DEVICE_TORCH        = 9005
     };


//! Properties of cameras available through Smartek Giganetix Ethernet Vision interface
/* --- Vladimir Litvinenko (litvinenko.vladimir@gmail.com) --- */
enum { CAP_PROP_GIGA_FRAME_OFFSET_X   = 10001,
       CAP_PROP_GIGA_FRAME_OFFSET_Y   = 10002,
       CAP_PROP_GIGA_FRAME_WIDTH_MAX  = 10003,
       CAP_PROP_GIGA_FRAME_HEIGH_MAX  = 10004,
       CAP_PROP_GIGA_FRAME_SENS_WIDTH = 10005,
       CAP_PROP_GIGA_FRAME_SENS_HEIGH = 10006
     };

enum { CAP_PROP_INTELPERC_PROFILE_COUNT               = 11001,
       CAP_PROP_INTELPERC_PROFILE_IDX                 = 11002,
       CAP_PROP_INTELPERC_DEPTH_LOW_CONFIDENCE_VALUE  = 11003,
       CAP_PROP_INTELPERC_DEPTH_SATURATION_VALUE      = 11004,
       CAP_PROP_INTELPERC_DEPTH_CONFIDENCE_THRESHOLD  = 11005,
       CAP_PROP_INTELPERC_DEPTH_FOCAL_LENGTH_HORZ     = 11006,
       CAP_PROP_INTELPERC_DEPTH_FOCAL_LENGTH_VERT     = 11007
     };

//! Intel PerC streams
enum { CAP_INTELPERC_DEPTH_GENERATOR = 1 << 29,
       CAP_INTELPERC_IMAGE_GENERATOR = 1 << 28,
       CAP_INTELPERC_GENERATORS_MASK = CAP_INTELPERC_DEPTH_GENERATOR + CAP_INTELPERC_IMAGE_GENERATOR
     };

enum { CAP_INTELPERC_DEPTH_MAP              = 0, //!< Each pixel is a 16-bit integer. The value indicates the distance from an object to the camera's XY plane or the Cartesian depth.
       CAP_INTELPERC_UVDEPTH_MAP            = 1, //!< Each pixel contains two 32-bit floating point values in the range of 0-1, representing the mapping of depth coordinates to the color coordinates.
       CAP_INTELPERC_IR_MAP                 = 2, //!< Each pixel is a 16-bit integer. The value indicates the intensity of the reflected laser beam.
       CAP_INTELPERC_IMAGE                  = 3
     };

enum { VIDEOWRITER_PROP_QUALITY = 1,    //!< Current quality (0..100%) of the encoded videostream. Can be adjusted dynamically in some codecs.
       VIDEOWRITER_PROP_FRAMEBYTES = 2, //!< (Read-only): Size of just encoded video frame. Note that the encoding order may be different from representation order.
       VIDEOWRITER_PROP_NSTRIPES = 3    //!< Number of stripes for parallel encoding. -1 for auto detection.
     };

/** @brief gPhoto2 properties

if propertyId is less than 0 then work on widget with that __additive inversed__ camera setting ID
Get IDs by using CAP_PROP_GPHOTO2_WIDGET_ENUMERATE.
@see CvCaptureCAM_GPHOTO2 for more info
*/
enum { CAP_PROP_GPHOTO2_PREVIEW           = 17001, //!< Capture only preview from liveview mode.
       CAP_PROP_GPHOTO2_WIDGET_ENUMERATE  = 17002, //!< Readonly, returns (const char *).
       CAP_PROP_GPHOTO2_RELOAD_CONFIG     = 17003, //!< Trigger, only by set. Reload camera settings.
       CAP_PROP_GPHOTO2_RELOAD_ON_CHANGE  = 17004, //!< Reload all settings on set.
       CAP_PROP_GPHOTO2_COLLECT_MSGS      = 17005, //!< Collect messages with details.
       CAP_PROP_GPHOTO2_FLUSH_MSGS        = 17006, //!< Readonly, returns (const char *).
       CAP_PROP_SPEED                     = 17007, //!< Exposure speed. Can be readonly, depends on camera program.
       CAP_PROP_APERTURE                  = 17008, //!< Aperture. Can be readonly, depends on camera program.
       CAP_PROP_EXPOSUREPROGRAM           = 17009, //!< Camera exposure program.
       CAP_PROP_VIEWFINDER                = 17010  //!< Enter liveview mode.
     };

//enum {

class IVideoCapture;

/** @brief Class for video capturing from video files, image sequences or cameras. The class provides C++ API
for capturing video from cameras or for reading video files and image sequences. Here is how the
class can be used: :
@code
    #include "opencv2/opencv.hpp"

    using namespace cv;

    int main(int, char**)
    {
        VideoCapture cap(0); // open the default camera
        if(!cap.isOpened())  // check if we succeeded
            return -1;

        Mat edges;
        namedWindow("edges",1);
        for(;;)
        {
            Mat frame;
            cap >> frame; // get a new frame from camera
            cvtColor(frame, edges, COLOR_BGR2GRAY);
            GaussianBlur(edges, edges, Size(7,7), 1.5, 1.5);
            Canny(edges, edges, 0, 30, 3);
            imshow("edges", edges);
            if(waitKey(30) >= 0) break;
        }
        // the camera will be deinitialized automatically in VideoCapture destructor
        return 0;
    }
@endcode
@note In C API the black-box structure CvCapture is used instead of VideoCapture.

@note
-   A basic sample on using the VideoCapture interface can be found at
    opencv_source_code/samples/cpp/starter_video.cpp
-   Another basic video processing sample can be found at
    opencv_source_code/samples/cpp/video_dmtx.cpp
-   (Python) A basic sample on using the VideoCapture interface can be found at
    opencv_source_code/samples/python/video.py
-   (Python) Another basic video processing sample can be found at
    opencv_source_code/samples/python/video_dmtx.py
-   (Python) A multi threaded video processing sample can be found at
    opencv_source_code/samples/python/video_threaded.py
 */
class CV_EXPORTS_W VideoCapture
{
public:
    /** @brief
    @note In C API, when you finished working with video, release CvCapture structure with
    cvReleaseCapture(), or use Ptr\<CvCapture\> that calls cvReleaseCapture() automatically in the
    destructor.
     */
    CV_WRAP VideoCapture();

    /** @overload
    @param filename name of the opened video file (eg. video.avi) or image sequence (eg.
    img_%02d.jpg, which will read samples like img_00.jpg, img_01.jpg, img_02.jpg, ...)
    */
    CV_WRAP VideoCapture(const String& filename);

    /** @overload
    @param filename name of the opened video file (eg. video.avi) or image sequence (eg.
    img_%02d.jpg, which will read samples like img_00.jpg, img_01.jpg, img_02.jpg, ...)

    @param apiPreference preferred Capture API to use. Can be used to enforce a specific reader
    implementation if multiple are available: e.g. cv::CAP_FFMPEG or cv::CAP_IMAGES
    */
    CV_WRAP VideoCapture(const String& filename, int apiPreference);

    /** @overload
    @param index = camera_id + domain_offset (CAP_*). id of the video capturing device to open. If there is a single
    camera connected, just pass 0. Advanced Usage: to open Camera 1 using the MS Media Foundation API: index = 1 + cv::CAP_MSMF
    */
    CV_WRAP VideoCapture(int index);

    virtual ~VideoCapture();

    /** @brief Open video file or a capturing device for video capturing

    @param filename name of the opened video file (eg. video.avi) or image sequence (eg.
    img_%02d.jpg, which will read samples like img_00.jpg, img_01.jpg, img_02.jpg, ...)

    The methods first call VideoCapture::release to close the already opened file or camera.
     */
    CV_WRAP virtual bool open(const String& filename);

    /** @overload
    @param index = camera_id + domain_offset (CAP_*). id of the video capturing device to open. If there is a single
    camera connected, just pass 0. Advanced Usage: to open Camera 1 using the MS Media Foundation API: index = 1 + cv::CAP_MSMF
    */
    CV_WRAP virtual bool open(int index);

    /** @brief Returns true if video capturing has been initialized already.

    If the previous call to VideoCapture constructor or VideoCapture::open succeeded, the method returns
    true.
     */
    CV_WRAP virtual bool isOpened() const;

    /** @brief Closes video file or capturing device.

    The methods are automatically called by subsequent VideoCapture::open and by VideoCapture
    destructor.

    The C function also deallocates memory and clears \*capture pointer.
     */
    CV_WRAP virtual void release();

    /** @brief Grabs the next frame from video file or capturing device.

    The methods/functions grab the next frame from video file or camera and return true (non-zero) in
    the case of success.

    The primary use of the function is in multi-camera environments, especially when the cameras do not
    have hardware synchronization. That is, you call VideoCapture::grab() for each camera and after that
    call the slower method VideoCapture::retrieve() to decode and get frame from each camera. This way
    the overhead on demosaicing or motion jpeg decompression etc. is eliminated and the retrieved frames
    from different cameras will be closer in time.

    Also, when a connected camera is multi-head (for example, a stereo camera or a Kinect device), the
    correct way of retrieving data from it is to call VideoCapture::grab first and then call
    VideoCapture::retrieve one or more times with different values of the channel parameter. See
    <https://github.com/opencv/opencv/tree/master/samples/cpp/openni_capture.cpp>
     */
    CV_WRAP virtual bool grab();

    /** @brief Decodes and returns the grabbed video frame.

    The methods/functions decode and return the just grabbed frame. If no frames has been grabbed
    (camera has been disconnected, or there are no more frames in video file), the methods return false
    and the functions return NULL pointer.

    @note OpenCV 1.x functions cvRetrieveFrame and cv.RetrieveFrame return image stored inside the video
    capturing structure. It is not allowed to modify or release the image! You can copy the frame using
    :ocvcvCloneImage and then do whatever you want with the copy.
     */
    CV_WRAP virtual bool retrieve(OutputArray image, int flag = 0);
    virtual VideoCapture& operator >> (CV_OUT Mat& image);
    virtual VideoCapture& operator >> (CV_OUT UMat& image);

    /** @brief Grabs, decodes and returns the next video frame.

    The methods/functions combine VideoCapture::grab and VideoCapture::retrieve in one call. This is the
    most convenient method for reading video files or capturing data from decode and return the just
    grabbed frame. If no frames has been grabbed (camera has been disconnected, or there are no more
    frames in video file), the methods return false and the functions return NULL pointer.

    @note OpenCV 1.x functions cvRetrieveFrame and cv.RetrieveFrame return image stored inside the video
    capturing structure. It is not allowed to modify or release the image! You can copy the frame using
    :ocvcvCloneImage and then do whatever you want with the copy.
     */
    CV_WRAP virtual bool read(OutputArray image);

    /** @brief Sets a property in the VideoCapture.

    @param propId Property identifier. It can be one of the following:
    -   cv::CAP_PROP_POS_MSEC @copydoc cv::CAP_PROP_POS_MSEC
    -   cv::CAP_PROP_POS_FRAMES @copydoc CAP_PROP_POS_FRAMES
    -   cv::CAP_PROP_POS_AVI_RATIO @copydoc cv::CAP_PROP_POS_AVI_RATIO
    -   cv::CAP_PROP_FRAME_WIDTH @copydoc cv::CAP_PROP_FRAME_WIDTH
    -   cv::CAP_PROP_FRAME_HEIGHT @copydoc cv::CAP_PROP_FRAME_HEIGHT
    -   cv::CAP_PROP_FPS @copydoc cv::CAP_PROP_FPS
    -   cv::CAP_PROP_FOURCC @copydoc cv::CAP_PROP_FOURCC
    -   cv::CAP_PROP_FRAME_COUNT @copydoc cv::CAP_PROP_FRAME_COUNT
    -   cv::CAP_PROP_FORMAT @copydoc cv::CAP_PROP_FORMAT
    -   cv::CAP_PROP_MODE @copydoc cv::CAP_PROP_MODE
    -   cv::CAP_PROP_BRIGHTNESS @copydoc cv::CAP_PROP_BRIGHTNESS
    -   cv::CAP_PROP_CONTRAST @copydoc cv::CAP_PROP_CONTRAST
    -   cv::CAP_PROP_SATURATION @copydoc cv::CAP_PROP_SATURATION
    -   cv::CAP_PROP_HUE @copydoc cv::CAP_PROP_HUE
    -   cv::CAP_PROP_GAIN @copydoc cv::CAP_PROP_GAIN
    -   cv::CAP_PROP_EXPOSURE @copydoc cv::CAP_PROP_EXPOSURE
    -   cv::CAP_PROP_CONVERT_RGB @copydoc cv::CAP_PROP_CONVERT_RGB
    -   cv::CAP_PROP_WHITE_BALANCE_BLUE_U @copydoc cv::CAP_PROP_WHITE_BALANCE_BLUE_U
    -   cv::CAP_PROP_WHITE_BALANCE_RED_V @copydoc cv::CAP_PROP_WHITE_BALANCE_RED_V
    -   cv::CAP_PROP_RECTIFICATION @copydoc cv::CAP_PROP_RECTIFICATION
    @param value Value of the property.
     */
    CV_WRAP virtual bool set(int propId, double value);

    /** @brief Returns the specified VideoCapture property

    @param propId Property identifier. It can be one of the following:
    -   cv::CAP_PROP_POS_MSEC @copydoc cv::CAP_PROP_POS_MSEC
    -   cv::CAP_PROP_POS_FRAMES @copydoc CAP_PROP_POS_FRAMES
    -   cv::CAP_PROP_POS_AVI_RATIO @copydoc cv::CAP_PROP_POS_AVI_RATIO
    -   cv::CAP_PROP_FRAME_WIDTH @copydoc cv::CAP_PROP_FRAME_WIDTH
    -   cv::CAP_PROP_FRAME_HEIGHT @copydoc cv::CAP_PROP_FRAME_HEIGHT
    -   cv::CAP_PROP_FPS @copydoc cv::CAP_PROP_FPS
    -   cv::CAP_PROP_FOURCC @copydoc cv::CAP_PROP_FOURCC
    -   cv::CAP_PROP_FRAME_COUNT @copydoc cv::CAP_PROP_FRAME_COUNT
    -   cv::CAP_PROP_FORMAT @copydoc cv::CAP_PROP_FORMAT
    -   cv::CAP_PROP_MODE @copydoc cv::CAP_PROP_MODE
    -   cv::CAP_PROP_BRIGHTNESS @copydoc cv::CAP_PROP_BRIGHTNESS
    -   cv::CAP_PROP_CONTRAST @copydoc cv::CAP_PROP_CONTRAST
    -   cv::CAP_PROP_SATURATION @copydoc cv::CAP_PROP_SATURATION
    -   cv::CAP_PROP_HUE @copydoc cv::CAP_PROP_HUE
    -   cv::CAP_PROP_GAIN @copydoc cv::CAP_PROP_GAIN
    -   cv::CAP_PROP_EXPOSURE @copydoc cv::CAP_PROP_EXPOSURE
    -   cv::CAP_PROP_CONVERT_RGB @copydoc cv::CAP_PROP_CONVERT_RGB
    -   cv::CAP_PROP_WHITE_BALANCE_BLUE_U @copydoc cv::CAP_PROP_WHITE_BALANCE_BLUE_U
    -   cv::CAP_PROP_WHITE_BALANCE_RED_V @copydoc cv::CAP_PROP_WHITE_BALANCE_RED_V
    -   cv::CAP_PROP_RECTIFICATION @copydoc cv::CAP_PROP_RECTIFICATION

    @note When querying a property that is not supported by the backend used by the VideoCapture
    class, value 0 is returned.
     */
    CV_WRAP virtual double get(int propId) const;

    /** @overload

    @param filename name of the opened video file (eg. video.avi) or image sequence (eg.
    img_%02d.jpg, which will read samples like img_00.jpg, img_01.jpg, img_02.jpg, ...)

    @param apiPreference preferred Capture API to use. Can be used to enforce a specific reader
    implementation if multiple are available: e.g. cv::CAP_FFMPEG or cv::CAP_IMAGES

    The methods first call VideoCapture::release to close the already opened file or camera.
     */
    CV_WRAP virtual bool open(const String& filename, int apiPreference);

protected:
    Ptr<CvCapture> cap;
    Ptr<IVideoCapture> icap;
};

class IVideoWriter;

/** @brief Video writer class.
 */
class CV_EXPORTS_W VideoWriter
{
public:
    /** @brief VideoWriter constructors

    The constructors/functions initialize video writers. On Linux FFMPEG is used to write videos; on
    Windows FFMPEG or VFW is used; on MacOSX QTKit is used.
     */
    CV_WRAP VideoWriter();

    /** @overload
    @param filename Name of the output video file.
    @param fourcc 4-character code of codec used to compress the frames. For example,
    VideoWriter::fourcc('P','I','M','1') is a MPEG-1 codec, VideoWriter::fourcc('M','J','P','G') is a
    motion-jpeg codec etc. List of codes can be obtained at [Video Codecs by
    FOURCC](http://www.fourcc.org/codecs.php) page. FFMPEG backend with MP4 container natively uses
    other values as fourcc code: see [ObjectType](http://www.mp4ra.org/codecs.html),
    so you may receive a warning message from OpenCV about fourcc code conversion.
    @param fps Framerate of the created video stream.
    @param frameSize Size of the video frames.
    @param isColor If it is not zero, the encoder will expect and encode color frames, otherwise it
    will work with grayscale frames (the flag is currently supported on Windows only).
    */
    CV_WRAP VideoWriter(const String& filename, int fourcc, double fps,
                Size frameSize, bool isColor = true);

    virtual ~VideoWriter();

    /** @brief Initializes or reinitializes video writer.

    The method opens video writer. Parameters are the same as in the constructor
    VideoWriter::VideoWriter.
     */
    CV_WRAP virtual bool open(const String& filename, int fourcc, double fps,
                      Size frameSize, bool isColor = true);

    /** @brief Returns true if video writer has been successfully initialized.
    */
    CV_WRAP virtual bool isOpened() const;

    /** @brief Closes the video writer.

    The methods are automatically called by subsequent VideoWriter::open and by the VideoWriter
    destructor.
     */
    CV_WRAP virtual void release();
    virtual VideoWriter& operator << (const Mat& image);

    /** @brief Writes the next video frame

    @param image The written frame

    The functions/methods write the specified image to video file. It must have the same size as has
    been specified when opening the video writer.
     */
    CV_WRAP virtual void write(const Mat& image);

    /** @brief Sets a property in the VideoWriter.

     @param propId Property identifier. It can be one of the following:
     -   cv::VIDEOWRITER_PROP_QUALITY @copydoc cv::VIDEOWRITER_PROP_QUALITY
     -   cv::VIDEOWRITER_PROP_NSTRIPES @copydoc cv::VIDEOWRITER_PROP_NSTRIPES
     @param value Value of the property.
     */
    CV_WRAP virtual bool set(int propId, double value);

    /** @brief Returns the specified VideoWriter property

     @param propId Property identifier. It can be one of the following:
     -   cv::VIDEOWRITER_PROP_QUALITY @copydoc cv::VIDEOWRITER_PROP_QUALITY
     -   cv::VIDEOWRITER_PROP_FRAMEBYTES @copydoc VIDEOWRITER_PROP_FRAMEBYTES
     -   cv::VIDEOWRITER_PROP_NSTRIPES @copydoc cv::VIDEOWRITER_PROP_NSTRIPES

     @note When querying a property that is not supported by the backend used by the VideoWriter
     class, value 0 is returned.
     */
    CV_WRAP virtual double get(int propId) const;

    /** @brief Concatenates 4 chars to a fourcc code

    This static method constructs the fourcc code of the codec to be used in the constructor
    VideoWriter::VideoWriter or VideoWriter::open.
     */
    CV_WRAP static int fourcc(char c1, char c2, char c3, char c4);

protected:
    Ptr<CvVideoWriter> writer;
    Ptr<IVideoWriter> iwriter;

    static Ptr<IVideoWriter> create(const String& filename, int fourcc, double fps,
                                    Size frameSize, bool isColor = true);
};

template<> CV_EXPORTS void DefaultDeleter<CvCapture>::operator ()(CvCapture* obj) const;
template<> CV_EXPORTS void DefaultDeleter<CvVideoWriter>::operator ()(CvVideoWriter* obj) const;

//! @} videoio

} // cv

#endif //__OPENCV_VIDEOIO_HPP__