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# ifndef __OPENCV_VIDEOIO_HPP__
# define __OPENCV_VIDEOIO_HPP__
# include "opencv2/core.hpp"
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/**
@ defgroup videoio Media I / O
@ {
@ defgroup videoio_c C API
@ defgroup videoio_ios iOS glue
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@ defgroup videoio_winrt WinRT glue
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@ }
*/
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////////////////////////////////// video io /////////////////////////////////
typedef struct CvCapture CvCapture ;
typedef struct CvVideoWriter CvVideoWriter ;
namespace cv
{
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//! @addtogroup videoio
//! @{
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// Camera API
enum { CAP_ANY = 0 , // autodetect
CAP_VFW = 200 , // platform native
CAP_V4L = 200 ,
CAP_V4L2 = CAP_V4L ,
CAP_FIREWARE = 300 , // IEEE 1394 drivers
CAP_FIREWIRE = CAP_FIREWARE ,
CAP_IEEE1394 = CAP_FIREWARE ,
CAP_DC1394 = CAP_FIREWARE ,
CAP_CMU1394 = CAP_FIREWARE ,
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)
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CAP_ANDROID = 1000 , // Android - not used
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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)
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CAP_WINRT = 1410 , // Microsoft Windows Runtime using Media Foundation
CAP_INTELPERC = 1500 , // Intel Perceptual Computing SDK
CAP_OPENNI2 = 1600 , // OpenNI2 (for Kinect)
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CAP_OPENNI2_ASUS = 1610 , // OpenNI2 (for Asus Xtion and Occipital Structure sensors)
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CAP_GPHOTO2 = 1700 , // gPhoto2 connection
CAP_GSTREAMER = 1800 , // GStreamer
CAP_FFMPEG = 1900 , // FFMPEG
CAP_IMAGES = 2000 // OpenCV Image Sequence (e.g. img_%02d.jpg)
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} ;
// generic properties (based on DC1394 properties)
enum { CAP_PROP_POS_MSEC = 0 ,
CAP_PROP_POS_FRAMES = 1 ,
CAP_PROP_POS_AVI_RATIO = 2 ,
CAP_PROP_FRAME_WIDTH = 3 ,
CAP_PROP_FRAME_HEIGHT = 4 ,
CAP_PROP_FPS = 5 ,
CAP_PROP_FOURCC = 6 ,
CAP_PROP_FRAME_COUNT = 7 ,
CAP_PROP_FORMAT = 8 ,
CAP_PROP_MODE = 9 ,
CAP_PROP_BRIGHTNESS = 10 ,
CAP_PROP_CONTRAST = 11 ,
CAP_PROP_SATURATION = 12 ,
CAP_PROP_HUE = 13 ,
CAP_PROP_GAIN = 14 ,
CAP_PROP_EXPOSURE = 15 ,
CAP_PROP_CONVERT_RGB = 16 ,
CAP_PROP_WHITE_BALANCE_BLUE_U = 17 ,
CAP_PROP_RECTIFICATION = 18 ,
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CAP_PROP_MONOCHROME = 19 ,
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CAP_PROP_SHARPNESS = 20 ,
CAP_PROP_AUTO_EXPOSURE = 21 , // DC1394: exposure control done by camera, user can adjust refernce 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 ,
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CAP_PROP_SETTINGS = 37 ,
CAP_PROP_BUFFERSIZE = 38 ,
CAP_PROP_AUTOFOCUS = 39
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} ;
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// Generic camera output modes.
// Currently, these are supported through the libv4l interface only.
enum { CAP_MODE_BGR = 0 , // BGR24 (default)
CAP_MODE_RGB = 1 , // RGB24
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CAP_MODE_GRAY = 2 , // Y8
CAP_MODE_YUYV = 3 // YUYV
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} ;
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// 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_GENERATORS_MASK = CAP_OPENNI_DEPTH_GENERATOR + CAP_OPENNI_IMAGE_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 ,
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CAP_PROP_OPENNI_GENERATOR_PRESENT = 109 ,
CAP_PROP_OPENNI2_SYNC = 110 ,
CAP_PROP_OPENNI2_MIRROR = 111
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} ;
// OpenNI shortcats
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_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
} ;
// 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
// Data given from RGB image generator
CAP_OPENNI_BGR_IMAGE = 5 ,
CAP_OPENNI_GRAY_IMAGE = 6
} ;
// 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
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enum { CAP_PROP_PVAPI_MULTICASTIP = 300 , // ip for anable 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
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CAP_PROP_PVAPI_BINNINGY = 305 , // Vertical binning factor
CAP_PROP_PVAPI_PIXELFORMAT = 306 // Pixel format
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} ;
// 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
} ;
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// PVAPI: DecimationHorizontal, DecimationVertical
enum { CAP_PVAPI_DECIMATION_OFF = 1 , // Off
CAP_PVAPI_DECIMATION_2OUTOF4 = 2 , // 2 out of 4 decimation
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CAP_PVAPI_DECIMATION_2OUTOF8 = 4 , // 2 out of 8 decimation
CAP_PVAPI_DECIMATION_2OUTOF16 = 8 // 2 out of 16 decimation
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} ;
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// 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
} ;
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// 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
} ;
// 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
} ;
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enum { VIDEOWRITER_PROP_QUALITY = 1 , // Quality (0..100%) of the videostream encoded
VIDEOWRITER_PROP_FRAMEBYTES = 2 , // (Read-only): Size of just encoded video frame
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VIDEOWRITER_PROP_NSTRIPES = 3 // Number of stripes for parallel encoding. -1 for auto detection
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} ;
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// 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 {
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class IVideoCapture ;
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/** @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
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opencv_source_code / samples / cpp / starter_video . cpp
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- Another basic video processing sample can be found at
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opencv_source_code / samples / cpp / video_dmtx . cpp
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- ( Python ) A basic sample on using the VideoCapture interface can be found at
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opencv_source_code / samples / python / video . py
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- ( Python ) Another basic video processing sample can be found at
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opencv_source_code / samples / python / video_dmtx . py
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- ( Python ) A multi threaded video processing sample can be found at
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opencv_source_code / samples / python / video_threaded . py
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*/
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class CV_EXPORTS_W VideoCapture
{
public :
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/** @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 .
*/
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CV_WRAP VideoCapture ( ) ;
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/** @overload
@ param filename name of the opened video file ( eg . video . avi ) or image sequence ( eg .
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img_ % 02 d . jpg , which will read samples like img_00 . jpg , img_01 . jpg , img_02 . jpg , . . . )
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*/
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CV_WRAP VideoCapture ( const String & filename ) ;
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/** @overload
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@ param filename name of the opened video file ( eg . video . avi ) or image sequence ( eg .
img_ % 02 d . 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 . CAP_FFMPEG or 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 + CAP_MSMF
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*/
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CV_WRAP VideoCapture ( int index ) ;
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virtual ~ VideoCapture ( ) ;
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/** @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 .
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img_ % 02 d . jpg , which will read samples like img_00 . jpg , img_01 . jpg , img_02 . jpg , . . . )
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The methods first call VideoCapture : : release to close the already opened file or camera .
*/
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CV_WRAP virtual bool open ( const String & filename ) ;
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/** @overload
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@ 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 + CAP_MSMF
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*/
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CV_WRAP virtual bool open ( int index ) ;
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/** @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 .
*/
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CV_WRAP virtual bool isOpened ( ) const ;
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/** @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 .
*/
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CV_WRAP virtual void release ( ) ;
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/** @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/Itseez/opencv/tree/master/samples/cpp/openni_capture.cpp>
*/
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CV_WRAP virtual bool grab ( ) ;
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/** @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 .
*/
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CV_WRAP virtual bool retrieve ( OutputArray image , int flag = 0 ) ;
virtual VideoCapture & operator > > ( CV_OUT Mat & image ) ;
virtual VideoCapture & operator > > ( CV_OUT UMat & image ) ;
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/** @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 .
*/
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CV_WRAP virtual bool read ( OutputArray image ) ;
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/** @brief Sets a property in the VideoCapture.
@ param propId Property identifier . It can be one of the following :
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- * * CAP_PROP_POS_MSEC * * Current position of the video file in milliseconds .
- * * CAP_PROP_POS_FRAMES * * 0 - based index of the frame to be decoded / captured next .
- * * CAP_PROP_POS_AVI_RATIO * * Relative position of the video file : 0 - start of the
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film , 1 - end of the film .
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- * * CAP_PROP_FRAME_WIDTH * * Width of the frames in the video stream .
- * * CAP_PROP_FRAME_HEIGHT * * Height of the frames in the video stream .
- * * CAP_PROP_FPS * * Frame rate .
- * * CAP_PROP_FOURCC * * 4 - character code of codec .
- * * CAP_PROP_FRAME_COUNT * * Number of frames in the video file .
- * * CAP_PROP_FORMAT * * Format of the Mat objects returned by retrieve ( ) .
- * * CAP_PROP_MODE * * Backend - specific value indicating the current capture mode .
- * * CAP_PROP_BRIGHTNESS * * Brightness of the image ( only for cameras ) .
- * * CAP_PROP_CONTRAST * * Contrast of the image ( only for cameras ) .
- * * CAP_PROP_SATURATION * * Saturation of the image ( only for cameras ) .
- * * CAP_PROP_HUE * * Hue of the image ( only for cameras ) .
- * * CAP_PROP_GAIN * * Gain of the image ( only for cameras ) .
- * * CAP_PROP_EXPOSURE * * Exposure ( only for cameras ) .
- * * CAP_PROP_CONVERT_RGB * * Boolean flags indicating whether images should be converted
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to RGB .
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- * * CAP_PROP_WHITE_BALANCE * * Currently unsupported
- * * CAP_PROP_RECTIFICATION * * Rectification flag for stereo cameras ( note : only supported
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by DC1394 v 2. x backend currently )
@ param value Value of the property .
*/
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CV_WRAP virtual bool set ( int propId , double value ) ;
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/** @brief Returns the specified VideoCapture property
@ param propId Property identifier . It can be one of the following :
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- * * CAP_PROP_POS_MSEC * * Current position of the video file in milliseconds or video
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capture timestamp .
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- * * CAP_PROP_POS_FRAMES * * 0 - based index of the frame to be decoded / captured next .
- * * CAP_PROP_POS_AVI_RATIO * * Relative position of the video file : 0 - start of the
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film , 1 - end of the film .
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- * * CAP_PROP_FRAME_WIDTH * * Width of the frames in the video stream .
- * * CAP_PROP_FRAME_HEIGHT * * Height of the frames in the video stream .
- * * CAP_PROP_FPS * * Frame rate .
- * * CAP_PROP_FOURCC * * 4 - character code of codec .
- * * CAP_PROP_FRAME_COUNT * * Number of frames in the video file .
- * * CAP_PROP_FORMAT * * Format of the Mat objects returned by retrieve ( ) .
- * * CAP_PROP_MODE * * Backend - specific value indicating the current capture mode .
- * * CAP_PROP_BRIGHTNESS * * Brightness of the image ( only for cameras ) .
- * * CAP_PROP_CONTRAST * * Contrast of the image ( only for cameras ) .
- * * CAP_PROP_SATURATION * * Saturation of the image ( only for cameras ) .
- * * CAP_PROP_HUE * * Hue of the image ( only for cameras ) .
- * * CAP_PROP_GAIN * * Gain of the image ( only for cameras ) .
- * * CAP_PROP_EXPOSURE * * Exposure ( only for cameras ) .
- * * CAP_PROP_CONVERT_RGB * * Boolean flags indicating whether images should be converted
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to RGB .
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- * * CAP_PROP_WHITE_BALANCE * * Currently not supported
- * * CAP_PROP_RECTIFICATION * * Rectification flag for stereo cameras ( note : only supported
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by DC1394 v 2. x backend currently )
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@ note When querying a property that is not supported by the backend used by the VideoCapture
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class , value 0 is returned .
*/
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CV_WRAP virtual double get ( int propId ) const ;
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/** @overload
@ param filename name of the opened video file ( eg . video . avi ) or image sequence ( eg .
img_ % 02 d . 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 . CAP_FFMPEG or 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 ) ;
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protected :
Ptr < CvCapture > cap ;
Ptr < IVideoCapture > icap ;
} ;
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class IVideoWriter ;
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/** @brief Video writer class.
*/
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class CV_EXPORTS_W VideoWriter
{
public :
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/** @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 .
*/
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CV_WRAP VideoWriter ( ) ;
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/** @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
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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 .
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@ 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 ) .
*/
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CV_WRAP VideoWriter ( const String & filename , int fourcc , double fps ,
Size frameSize , bool isColor = true ) ;
virtual ~ VideoWriter ( ) ;
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/** @brief Initializes or reinitializes video writer.
The method opens video writer . Parameters are the same as in the constructor
VideoWriter : : VideoWriter .
*/
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CV_WRAP virtual bool open ( const String & filename , int fourcc , double fps ,
Size frameSize , bool isColor = true ) ;
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/** @brief Returns true if video writer has been successfully initialized.
*/
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CV_WRAP virtual bool isOpened ( ) const ;
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/** @brief Closes the video writer.
The methods are automatically called by subsequent VideoWriter : : open and by the VideoWriter
destructor .
*/
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CV_WRAP virtual void release ( ) ;
virtual VideoWriter & operator < < ( const Mat & image ) ;
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/** @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 .
*/
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CV_WRAP virtual void write ( const Mat & image ) ;
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/** @brief Sets a property in the VideoWriter.
@ param propId Property identifier . It can be one of the following :
- * * VIDEOWRITER_PROP_QUALITY * * Quality ( 0. .100 % ) of the videostream encoded . Can be adjusted dynamically in some codecs .
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- * * VIDEOWRITER_PROP_NSTRIPES * * Number of stripes for parallel encoding
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@ 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 :
- * * VIDEOWRITER_PROP_QUALITY * * Current quality of the encoded videostream .
- * * VIDEOWRITER_PROP_FRAMEBYTES * * ( Read - only ) Size of just encoded video frame ; note that the encoding order may be different from representation order .
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- * * VIDEOWRITER_PROP_NSTRIPES * * Number of stripes for parallel encoding
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@ note When querying a property that is not supported by the backend used by the VideoWriter
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class , value 0 is returned .
*/
CV_WRAP virtual double get ( int propId ) const ;
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/** @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 .
*/
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CV_WRAP static int fourcc ( char c1 , char c2 , char c3 , char c4 ) ;
protected :
Ptr < CvVideoWriter > writer ;
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Ptr < IVideoWriter > iwriter ;
static Ptr < IVideoWriter > create ( const String & filename , int fourcc , double fps ,
Size frameSize , bool isColor = true ) ;
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} ;
template < > CV_EXPORTS void DefaultDeleter < CvCapture > : : operator ( ) ( CvCapture * obj ) const ;
template < > CV_EXPORTS void DefaultDeleter < CvVideoWriter > : : operator ( ) ( CvVideoWriter * obj ) const ;
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//! @} videoio
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} // cv
# endif //__OPENCV_VIDEOIO_HPP__