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//
// This file is auto-generated. Please don't modify it!
//
package org.opencv.videoio;
import org.opencv.core.Mat;
// C++: class VideoCapture
/**
* 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:
* INCLUDE: samples/cpp/videocapture_basic.cpp
*
* Note: In REF: videoio_c "C API" the black-box structure {@code CvCapture} is used instead of %VideoCapture.
* Note:
*
*
* (C++) A basic sample on using the %VideoCapture interface can be found at
* {@code OPENCV_SOURCE_CODE/samples/cpp/videocapture_starter.cpp}
*
*
* (Python) A basic sample on using the %VideoCapture interface can be found at
* {@code OPENCV_SOURCE_CODE/samples/python/video.py}
*
*
* (Python) A multi threaded video processing sample can be found at
* {@code OPENCV_SOURCE_CODE/samples/python/video_threaded.py}
*
*
* (Python) %VideoCapture sample showcasing some features of the Video4Linux2 backend
* {@code OPENCV_SOURCE_CODE/samples/python/video_v4l2.py}
*
*
*/
public class VideoCapture {
protected final long nativeObj;
protected VideoCapture(long addr) { nativeObj = addr; }
public long getNativeObjAddr() { return nativeObj; }
// internal usage only
public static VideoCapture __fromPtr__(long addr) { return new VideoCapture(addr); }
//
// C++: cv::VideoCapture::VideoCapture()
//
/**
* Default constructor
* Note: In REF: videoio_c "C API", when you finished working with video, release CvCapture structure with
* cvReleaseCapture(), or use Ptr<CvCapture> that calls cvReleaseCapture() automatically in the
* destructor.
*/
public VideoCapture() {
nativeObj = VideoCapture_0();
}
//
// C++: explicit cv::VideoCapture::VideoCapture(String filename, int apiPreference = CAP_ANY)
//
// Return type 'explicit' is not supported, skipping the function
//
// C++: explicit cv::VideoCapture::VideoCapture(int index, int apiPreference = CAP_ANY)
//
// Return type 'explicit' is not supported, skipping the function
//
// C++: String cv::VideoCapture::getBackendName()
//
/**
* Returns used backend API name
*
* Note: Stream should be opened.
* @return automatically generated
*/
public String getBackendName() {
return getBackendName_0(nativeObj);
}
//
// C++: bool cv::VideoCapture::getExceptionMode()
//
public boolean getExceptionMode() {
return getExceptionMode_0(nativeObj);
}
//
// C++: bool cv::VideoCapture::grab()
//
/**
* Grabs the next frame from video file or capturing device.
*
* @return {@code true} (non-zero) in the case of success.
*
* The method/function grabs the next frame from video file or camera and returns 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.
*
* REF: tutorial_kinect_openni
*/
public boolean grab() {
return grab_0(nativeObj);
}
//
// C++: bool cv::VideoCapture::isOpened()
//
/**
* Returns true if video capturing has been initialized already.
*
* If the previous call to VideoCapture constructor or VideoCapture::open() succeeded, the method returns
* true.
* @return automatically generated
*/
public boolean isOpened() {
return isOpened_0(nativeObj);
}
//
// C++: bool cv::VideoCapture::open(String filename, int apiPreference = CAP_ANY)
//
/**
* Opens a video file or a capturing device or an IP video stream for video capturing.
*
*
*
* Parameters are same as the constructor VideoCapture(const String& filename, int apiPreference = CAP_ANY)
* @return {@code true} if the file has been successfully opened
*
* The method first calls VideoCapture::release to close the already opened file or camera.
* @param filename automatically generated
* @param apiPreference automatically generated
*/
public boolean open(String filename, int apiPreference) {
return open_0(nativeObj, filename, apiPreference);
}
/**
* Opens a video file or a capturing device or an IP video stream for video capturing.
*
*
*
* Parameters are same as the constructor VideoCapture(const String& filename, int apiPreference = CAP_ANY)
* @return {@code true} if the file has been successfully opened
*
* The method first calls VideoCapture::release to close the already opened file or camera.
* @param filename automatically generated
*/
public boolean open(String filename) {
return open_1(nativeObj, filename);
}
//
// C++: bool cv::VideoCapture::open(int index, int apiPreference = CAP_ANY)
//
/**
* Opens a camera for video capturing
*
*
*
* Parameters are same as the constructor VideoCapture(int index, int apiPreference = CAP_ANY)
* @return {@code true} if the camera has been successfully opened.
*
* The method first calls VideoCapture::release to close the already opened file or camera.
* @param index automatically generated
* @param apiPreference automatically generated
*/
public boolean open(int index, int apiPreference) {
return open_2(nativeObj, index, apiPreference);
}
/**
* Opens a camera for video capturing
*
*
*
* Parameters are same as the constructor VideoCapture(int index, int apiPreference = CAP_ANY)
* @return {@code true} if the camera has been successfully opened.
*
* The method first calls VideoCapture::release to close the already opened file or camera.
* @param index automatically generated
*/
public boolean open(int index) {
return open_3(nativeObj, index);
}
//
// C++: bool cv::VideoCapture::read(Mat& image)
//
/**
* Grabs, decodes and returns the next video frame.
*
* @return {@code false} if no frames has been grabbed
*
* The method/function combines VideoCapture::grab() and VideoCapture::retrieve() in one call. This is the
* most convenient method for reading video files or capturing data from decode and returns the just
* grabbed frame. If no frames has been grabbed (camera has been disconnected, or there are no more
* frames in video file), the method returns false and the function returns empty image (with %cv::Mat, test it with Mat::empty()).
*
* Note: In REF: videoio_c "C API", 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
* cvCloneImage and then do whatever you want with the copy.
* @param image automatically generated
*/
public boolean read(Mat image) {
return read_0(nativeObj, image.nativeObj);
}
//
// C++: bool cv::VideoCapture::retrieve(Mat& image, int flag = 0)
//
/**
* Decodes and returns the grabbed video frame.
*
* @param flag it could be a frame index or a driver specific flag
* @return {@code false} if no frames has been grabbed
*
* The method decodes and returns the just grabbed frame. If no frames has been grabbed
* (camera has been disconnected, or there are no more frames in video file), the method returns false
* and the function returns an empty image (with %cv::Mat, test it with Mat::empty()).
*
* SEE: read()
*
* Note: In REF: videoio_c "C API", 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
* cvCloneImage and then do whatever you want with the copy.
* @param image automatically generated
*/
public boolean retrieve(Mat image, int flag) {
return retrieve_0(nativeObj, image.nativeObj, flag);
}
/**
* Decodes and returns the grabbed video frame.
*
* @return {@code false} if no frames has been grabbed
*
* The method decodes and returns the just grabbed frame. If no frames has been grabbed
* (camera has been disconnected, or there are no more frames in video file), the method returns false
* and the function returns an empty image (with %cv::Mat, test it with Mat::empty()).
*
* SEE: read()
*
* Note: In REF: videoio_c "C API", 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
* cvCloneImage and then do whatever you want with the copy.
* @param image automatically generated
*/
public boolean retrieve(Mat image) {
return retrieve_1(nativeObj, image.nativeObj);
}
//
// C++: bool cv::VideoCapture::set(int propId, double value)
//
/**
* Sets a property in the VideoCapture.
*
* @param propId Property identifier from cv::VideoCaptureProperties (eg. cv::CAP_PROP_POS_MSEC, cv::CAP_PROP_POS_FRAMES, ...)
* or one from REF: videoio_flags_others
* @param value Value of the property.
* @return {@code true} if the property is supported by backend used by the VideoCapture instance.
* Note: Even if it returns {@code true} this doesn't ensure that the property
* value has been accepted by the capture device. See note in VideoCapture::get()
*/
public boolean set(int propId, double value) {
return set_0(nativeObj, propId, value);
}
//
// C++: double cv::VideoCapture::get(int propId)
//
/**
* Returns the specified VideoCapture property
*
* @param propId Property identifier from cv::VideoCaptureProperties (eg. cv::CAP_PROP_POS_MSEC, cv::CAP_PROP_POS_FRAMES, ...)
* or one from REF: videoio_flags_others
* @return Value for the specified property. Value 0 is returned when querying a property that is
* not supported by the backend used by the VideoCapture instance.
*
* Note: Reading / writing properties involves many layers. Some unexpected result might happens
* along this chain.
*
* VideoCapture -> API Backend -> Operating System -> Device Driver -> Device Hardware
*
* The returned value might be different from what really used by the device or it could be encoded
* using device dependent rules (eg. steps or percentage). Effective behaviour depends from device
* driver and API Backend
*/
public double get(int propId) {
return get_0(nativeObj, propId);
}
//
// C++: void cv::VideoCapture::release()
//
/**
* Closes video file or capturing device.
*
* The method is automatically called by subsequent VideoCapture::open and by VideoCapture
* destructor.
*
* The C function also deallocates memory and clears \*capture pointer.
*/
public void release() {
release_0(nativeObj);
}
//
// C++: void cv::VideoCapture::setExceptionMode(bool enable)
//
/**
* Switches exceptions mode
*
* methods raise exceptions if not successful instead of returning an error code
* @param enable automatically generated
*/
public void setExceptionMode(boolean enable) {
setExceptionMode_0(nativeObj, enable);
}
@Override
protected void finalize() throws Throwable {
delete(nativeObj);
}
// C++: cv::VideoCapture::VideoCapture()
private static native long VideoCapture_0();
// C++: String cv::VideoCapture::getBackendName()
private static native String getBackendName_0(long nativeObj);
// C++: bool cv::VideoCapture::getExceptionMode()
private static native boolean getExceptionMode_0(long nativeObj);
// C++: bool cv::VideoCapture::grab()
private static native boolean grab_0(long nativeObj);
// C++: bool cv::VideoCapture::isOpened()
private static native boolean isOpened_0(long nativeObj);
// C++: bool cv::VideoCapture::open(String filename, int apiPreference = CAP_ANY)
private static native boolean open_0(long nativeObj, String filename, int apiPreference);
private static native boolean open_1(long nativeObj, String filename);
// C++: bool cv::VideoCapture::open(int index, int apiPreference = CAP_ANY)
private static native boolean open_2(long nativeObj, int index, int apiPreference);
private static native boolean open_3(long nativeObj, int index);
// C++: bool cv::VideoCapture::read(Mat& image)
private static native boolean read_0(long nativeObj, long image_nativeObj);
// C++: bool cv::VideoCapture::retrieve(Mat& image, int flag = 0)
private static native boolean retrieve_0(long nativeObj, long image_nativeObj, int flag);
private static native boolean retrieve_1(long nativeObj, long image_nativeObj);
// C++: bool cv::VideoCapture::set(int propId, double value)
private static native boolean set_0(long nativeObj, int propId, double value);
// C++: double cv::VideoCapture::get(int propId)
private static native double get_0(long nativeObj, int propId);
// C++: void cv::VideoCapture::release()
private static native void release_0(long nativeObj);
// C++: void cv::VideoCapture::setExceptionMode(bool enable)
private static native void setExceptionMode_0(long nativeObj, boolean enable);
// native support for java finalize()
private static native void delete(long nativeObj);
}
