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Open Source Computer Vision Library https://opencv.org/
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opencv/modules/videoio/src/cap.cpp

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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// Intel License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000, Intel Corporation, all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of Intel Corporation may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
#include "precomp.hpp"
#include <iostream>
using namespace std;
#include "cap_intelperc.hpp"
#include "cap_dshow.hpp"
#ifdef HAVE_MFX
#include "cap_mfx_reader.hpp"
#include "cap_mfx_writer.hpp"
#endif
// All WinRT versions older than 8.0 should provide classes used for video support
#if defined(WINRT) && !defined(WINRT_8_0) && defined(__cplusplus_winrt)
# include "cap_winrt_capture.hpp"
# include "cap_winrt_bridge.hpp"
# define WINRT_VIDEO
#endif
#if defined _M_X64 && defined _MSC_VER && !defined CV_ICC
#pragma optimize("",off)
#pragma warning(disable: 4748)
#endif
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wimplicit-fallthrough"
#endif
#if defined(__GNUC__) && __GNUC__ >= 7
#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
#endif
using namespace cv;
namespace cv
{
template<> void DefaultDeleter<CvCapture>::operator ()(CvCapture* obj) const
{ cvReleaseCapture(&obj); }
template<> void DefaultDeleter<CvVideoWriter>::operator ()(CvVideoWriter* obj) const
{ cvReleaseVideoWriter(&obj); }
}
/************************* Reading AVIs & Camera data **************************/
static inline double icvGetCaptureProperty( const CvCapture* capture, int id )
{
return capture ? capture->getProperty(id) : 0;
}
CV_IMPL void cvReleaseCapture( CvCapture** pcapture )
{
if( pcapture && *pcapture )
{
delete *pcapture;
*pcapture = 0;
}
}
CV_IMPL IplImage* cvQueryFrame( CvCapture* capture )
{
if(!capture)
return 0;
if(!capture->grabFrame())
return 0;
return capture->retrieveFrame(0);
}
CV_IMPL int cvGrabFrame( CvCapture* capture )
{
return capture ? capture->grabFrame() : 0;
}
CV_IMPL IplImage* cvRetrieveFrame( CvCapture* capture, int idx )
{
return capture ? capture->retrieveFrame(idx) : 0;
}
CV_IMPL double cvGetCaptureProperty( CvCapture* capture, int id )
{
return icvGetCaptureProperty(capture, id);
}
CV_IMPL int cvSetCaptureProperty( CvCapture* capture, int id, double value )
{
return capture ? capture->setProperty(id, value) : 0;
}
CV_IMPL int cvGetCaptureDomain( CvCapture* capture)
{
return capture ? capture->getCaptureDomain() : 0;
}
static bool get_capture_debug_flag()
{
static bool initialized = false;
static bool flag = false;
if (!initialized)
{
#ifndef NO_GETENV
flag = getenv("OPENCV_VIDEOCAPTURE_DEBUG") ? true : false; // TODO Use getBoolParameter
#endif
initialized = true;
}
return flag;
}
#define TRY_OPEN(capture, backend_func) \
{ \
if (!capture) \
CV_TRY { \
if (get_capture_debug_flag()) fprintf(stderr, "VIDEOIO(%s): trying ...\n", #backend_func); \
capture = backend_func; \
if (get_capture_debug_flag()) fprintf(stderr, "VIDEOIO(%s): result=%p ...\n", #backend_func, capture); \
} CV_CATCH (cv::Exception, e) { \
fprintf(stderr, "VIDEOIO(%s): raised OpenCV exception:\n\n%s\n", #backend_func, e.what()); \
} CV_CATCH (std::exception, e) { \
fprintf(stderr, "VIDEOIO(%s): raised C++ exception:\n\n%s\n", #backend_func, e.what()); \
} CV_CATCH_ALL { \
fprintf(stderr, "VIDEOIO(%s): raised unknown C++ exception!\n\n", #backend_func); \
} \
}
/**
* Camera dispatching method: index is the camera number.
* If given an index from 0 to 99, it tries to find the first
* API that can access a given camera index.
* Add multiples of 100 to select an API.
*/
CV_IMPL CvCapture * cvCreateCameraCapture (int index)
{
// interpret preferred interface (0 = autodetect)
int pref = (index / 100) * 100;
// remove pref from index
index -= pref;
// local variable to memorize the captured device
CvCapture *capture = 0;
switch (pref)
{
default:
// user specified an API we do not know
// bail out to let the user know that it is not available
if (pref) break;
#ifdef HAVE_MSMF
case CAP_MSMF:
TRY_OPEN(capture, cvCreateCameraCapture_MSMF(index))
if (pref) break;
#endif
case CAP_VFW: // or CAP_V4L or CAP_V4L2
#ifdef HAVE_VFW
TRY_OPEN(capture, cvCreateCameraCapture_VFW(index))
#endif
#if defined HAVE_LIBV4L || defined HAVE_CAMV4L || defined HAVE_CAMV4L2 || defined HAVE_VIDEOIO
TRY_OPEN(capture, cvCreateCameraCapture_V4L(index))
#endif
if (pref) break; // CAP_VFW or CAP_V4L or CAP_V4L2
case CAP_FIREWIRE:
#ifdef HAVE_DC1394_2
TRY_OPEN(capture, cvCreateCameraCapture_DC1394_2(index))
#endif
#ifdef HAVE_DC1394
TRY_OPEN(capture, cvCreateCameraCapture_DC1394(index))
#endif
#ifdef HAVE_CMU1394
TRY_OPEN(capture, cvCreateCameraCapture_CMU(index))
#endif
if (pref) break; // CAP_FIREWIRE
#ifdef HAVE_MIL
case CAP_MIL:
TRY_OPEN(capture, cvCreateCameraCapture_MIL(index))
if (pref) break;
#endif
#if defined(HAVE_QUICKTIME) || defined(HAVE_QTKIT)
case CAP_QT:
TRY_OPEN(capture, cvCreateCameraCapture_QT(index))
if (pref) break;
#endif
#ifdef HAVE_UNICAP
case CAP_UNICAP:
TRY_OPEN(capture, cvCreateCameraCapture_Unicap(index))
if (pref) break;
#endif
#ifdef HAVE_PVAPI
case CAP_PVAPI:
TRY_OPEN(capture, cvCreateCameraCapture_PvAPI(index))
if (pref) break;
#endif
#ifdef HAVE_OPENNI
case CAP_OPENNI:
TRY_OPEN(capture, cvCreateCameraCapture_OpenNI(index))
if (pref) break;
#endif
#ifdef HAVE_OPENNI2
case CAP_OPENNI2:
TRY_OPEN(capture, cvCreateCameraCapture_OpenNI2(index))
if (pref) break;
#endif
#ifdef HAVE_XIMEA
case CAP_XIAPI:
TRY_OPEN(capture, cvCreateCameraCapture_XIMEA(index))
if (pref) break;
#endif
#ifdef HAVE_AVFOUNDATION
case CAP_AVFOUNDATION:
TRY_OPEN(capture, cvCreateCameraCapture_AVFoundation(index))
if (pref) break;
#endif
#ifdef HAVE_GIGE_API
case CAP_GIGANETIX:
TRY_OPEN(capture, cvCreateCameraCapture_Giganetix(index))
if (pref) break; // CAP_GIGANETIX
#endif
#ifdef HAVE_ARAVIS_API
case CAP_ARAVIS:
TRY_OPEN(capture, cvCreateCameraCapture_Aravis(index))
if (pref) break;
#endif
}
return capture;
}
/**
* Videoreader dispatching method: it tries to find the first
* API that can access a given filename.
*/
CV_IMPL CvCapture * cvCreateFileCaptureWithPreference (const char * filename, int apiPreference)
{
CvCapture * result = 0;
switch(apiPreference) {
default:
// user specified an API we do not know
// bail out to let the user know that it is not available
if (apiPreference) break;
#ifdef HAVE_FFMPEG
case CAP_FFMPEG:
TRY_OPEN(result, cvCreateFileCapture_FFMPEG_proxy (filename))
if (apiPreference) break;
#endif
#if defined HAVE_LIBV4L || defined HAVE_CAMV4L || defined HAVE_CAMV4L2 || defined HAVE_VIDEOIO
case CAP_V4L:
TRY_OPEN(result, cvCreateCameraCapture_V4L(filename))
if (apiPreference) break;
#endif
#ifdef HAVE_MSMF
case CAP_MSMF:
TRY_OPEN(result, cvCreateFileCapture_MSMF (filename))
if (apiPreference) break;
#endif
#ifdef HAVE_VFW
case CAP_VFW:
TRY_OPEN(result, cvCreateFileCapture_VFW (filename))
if (apiPreference) break;
#endif
#if defined(HAVE_QUICKTIME) || defined(HAVE_QTKIT)
case CAP_QT:
TRY_OPEN(result, cvCreateFileCapture_QT (filename))
if (apiPreference) break;
#endif
#ifdef HAVE_AVFOUNDATION
case CAP_AVFOUNDATION:
TRY_OPEN(result, cvCreateFileCapture_AVFoundation (filename))
if (apiPreference) break;
#endif
#ifdef HAVE_OPENNI
case CAP_OPENNI:
TRY_OPEN(result, cvCreateFileCapture_OpenNI (filename))
if (apiPreference) break;
#endif
#ifdef HAVE_OPENNI2
case CAP_OPENNI2:
TRY_OPEN(result, cvCreateFileCapture_OpenNI2 (filename))
if (apiPreference) break;
#endif
#ifdef HAVE_XIMEA
case CAP_XIAPI:
TRY_OPEN(result, cvCreateCameraCapture_XIMEA(filename))
if (apiPreference) break;
#endif
case CAP_IMAGES:
TRY_OPEN(result, cvCreateFileCapture_Images (filename))
}
return result;
}
CV_IMPL CvCapture * cvCreateFileCapture (const char * filename)
{
return cvCreateFileCaptureWithPreference(filename, CAP_ANY);
}
/**
* Videowriter dispatching method: it tries to find the first
* API that can write a given stream.
*/
static CvVideoWriter* cvCreateVideoWriterWithPreference(const char* filename, int apiPreference, int fourcc,
double fps, CvSize frameSize, int is_color )
{
CV_UNUSED(frameSize);
CV_UNUSED(is_color);
CvVideoWriter *result = 0;
if(!fourcc || !fps)
TRY_OPEN(result, cvCreateVideoWriter_Images(filename))
CV_Assert(result || fps != 0);
switch(apiPreference)
{
default:
//exit if the specified API is unavaliable
if (apiPreference != CAP_ANY) break;
#ifdef HAVE_FFMPEG
case CAP_FFMPEG:
TRY_OPEN(result, cvCreateVideoWriter_FFMPEG_proxy (filename, fourcc, fps, frameSize, is_color))
if (apiPreference != CAP_ANY) break;
#endif
#ifdef HAVE_MSMF
case CAP_MSMF:
TRY_OPEN(result, cvCreateVideoWriter_MSMF(filename, fourcc, fps, frameSize, is_color))
if (apiPreference != CAP_ANY) break;
#endif
#ifdef HAVE_VFW
case CAP_VFW:
TRY_OPEN(result, cvCreateVideoWriter_VFW(filename, fourcc, fps, frameSize, is_color))
if (apiPreference != CAP_ANY) break;
#endif
#ifdef HAVE_AVFOUNDATION
case CAP_AVFOUNDATION:
TRY_OPEN(result, cvCreateVideoWriter_AVFoundation(filename, fourcc, fps, frameSize, is_color))
if (apiPreference != CAP_ANY) break;
#endif
#if defined(HAVE_QUICKTIME) || defined(HAVE_QTKIT)
case(CAP_QT):
TRY_OPEN(result, cvCreateVideoWriter_QT(filename, fourcc, fps, frameSize, is_color))
if (apiPreference != CAP_ANY) break;
#endif
#ifdef HAVE_GSTREAMER
case CAP_GSTREAMER:
TRY_OPEN(result, cvCreateVideoWriter_GStreamer (filename, fourcc, fps, frameSize, is_color))
if (apiPreference != CAP_ANY) break;
#endif
case CAP_IMAGES:
TRY_OPEN(result, cvCreateVideoWriter_Images(filename))
if (apiPreference != CAP_ANY) break;
}
return result;
}
CV_IMPL CvVideoWriter* cvCreateVideoWriter( const char* filename, int fourcc,
double fps, CvSize frameSize, int is_color )
{
return cvCreateVideoWriterWithPreference(filename, CAP_ANY, fourcc, fps, frameSize, is_color);
}
CV_IMPL int cvWriteFrame( CvVideoWriter* writer, const IplImage* image )
{
return writer ? writer->writeFrame(image) : 0;
}
CV_IMPL void cvReleaseVideoWriter( CvVideoWriter** pwriter )
{
if( pwriter && *pwriter )
{
delete *pwriter;
*pwriter = 0;
}
}
namespace cv
{
static Ptr<IVideoCapture> IVideoCapture_create(int index)
{
int domains[] =
{
#ifdef HAVE_GSTREAMER
CAP_GSTREAMER,
#endif
#ifdef HAVE_DSHOW
CAP_DSHOW,
#endif
#ifdef HAVE_INTELPERC
CAP_INTELPERC,
#endif
#ifdef WINRT_VIDEO
CAP_WINRT,
#endif
#ifdef HAVE_GPHOTO2
CAP_GPHOTO2,
#endif
-1, -1
};
// interpret preferred interface (0 = autodetect)
int pref = (index / 100) * 100;
if (pref)
{
domains[0]=pref;
index %= 100;
domains[1]=-1;
}
// try every possibly installed camera API
for (int i = 0; domains[i] >= 0; i++)
{
#if defined(HAVE_GSTREAMER) || \
defined(HAVE_DSHOW) || \
defined(HAVE_INTELPERC) || \
defined(WINRT_VIDEO) || \
defined(HAVE_GPHOTO2) || \
(0)
Ptr<IVideoCapture> capture;
switch (domains[i])
{
#ifdef HAVE_GSTREAMER
case CAP_GSTREAMER:
capture = createGStreamerCapture(index);
break;
#endif
#ifdef HAVE_DSHOW
case CAP_DSHOW:
capture = makePtr<VideoCapture_DShow>(index);
break; // CAP_DSHOW
#endif
#ifdef HAVE_INTELPERC
case CAP_INTELPERC:
capture = makePtr<VideoCapture_IntelPerC>();
break; // CAP_INTEL_PERC
#endif
#ifdef WINRT_VIDEO
case CAP_WINRT:
capture = Ptr<IVideoCapture>(new cv::VideoCapture_WinRT(index));
if (capture)
return capture;
break; // CAP_WINRT
#endif
#ifdef HAVE_GPHOTO2
case CAP_GPHOTO2:
capture = createGPhoto2Capture(index);
break;
#endif
}
if (capture && capture->isOpened())
return capture;
#endif
}
// failed open a camera
return Ptr<IVideoCapture>();
}
static Ptr<IVideoCapture> IVideoCapture_create(const String& filename, int apiPreference)
{
bool useAny = (apiPreference == CAP_ANY);
Ptr<IVideoCapture> capture;
#ifdef HAVE_GSTREAMER
if (useAny || apiPreference == CAP_GSTREAMER)
{
capture = createGStreamerCapture(filename);
if (capture && capture->isOpened())
return capture;
}
#endif
#ifdef HAVE_XINE
if (useAny || apiPreference == CAP_XINE)
{
capture = createXINECapture(filename.c_str());
if (capture && capture->isOpened())
return capture;
}
#endif
#ifdef HAVE_GPHOTO2
if (useAny || apiPreference == CAP_GPHOTO2)
{
capture = createGPhoto2Capture(filename);
if (capture && capture->isOpened())
return capture;
}
#endif
#ifdef HAVE_MFX
if (useAny || apiPreference == CAP_INTEL_MFX)
{
capture = makePtr<VideoCapture_IntelMFX>(filename);
if (capture && capture->isOpened())
return capture;
}
#endif
if (useAny || apiPreference == CAP_OPENCV_MJPEG)
{
capture = createMotionJpegCapture(filename);
if (capture && capture->isOpened())
return capture;
}
if (capture && !capture->isOpened())
capture.release();
return capture;
}
static Ptr<IVideoWriter> IVideoWriter_create(const String& filename, int apiPreference, int _fourcc, double fps, Size frameSize, bool isColor)
{
Ptr<IVideoWriter> iwriter;
#ifdef HAVE_MFX
if (apiPreference == CAP_INTEL_MFX || apiPreference == CAP_ANY)
{
iwriter = VideoWriter_IntelMFX::create(filename, _fourcc, fps, frameSize, isColor);
if (!iwriter.empty())
return iwriter;
}
#endif
if( (apiPreference == CAP_OPENCV_MJPEG || apiPreference == CAP_ANY)
&& _fourcc == CV_FOURCC('M', 'J', 'P', 'G') )
iwriter = createMotionJpegWriter(filename, fps, frameSize, isColor);
return iwriter;
}
VideoCapture::VideoCapture()
{}
VideoCapture::VideoCapture(const String& filename, int apiPreference)
{
CV_TRACE_FUNCTION();
open(filename, apiPreference);
}
VideoCapture::VideoCapture(const String& filename)
{
CV_TRACE_FUNCTION();
open(filename, CAP_ANY);
}
VideoCapture::VideoCapture(int index)
{
CV_TRACE_FUNCTION();
open(index);
}
VideoCapture::~VideoCapture()
{
CV_TRACE_FUNCTION();
icap.release();
cap.release();
}
bool VideoCapture::open(const String& filename, int apiPreference)
{
CV_TRACE_FUNCTION();
if (isOpened()) release();
icap = IVideoCapture_create(filename, apiPreference);
if (!icap.empty())
return true;
cap.reset(cvCreateFileCaptureWithPreference(filename.c_str(), apiPreference));
return isOpened();
}
bool VideoCapture::open(const String& filename)
{
CV_TRACE_FUNCTION();
return open(filename, CAP_ANY);
}
bool VideoCapture::open(int index)
{
CV_TRACE_FUNCTION();
if (isOpened()) release();
icap = IVideoCapture_create(index);
if (!icap.empty())
return true;
cap.reset(cvCreateCameraCapture(index));
return isOpened();
}
bool VideoCapture::open(int cameraNum, int apiPreference)
{
CV_TRACE_FUNCTION();
cameraNum = cameraNum + apiPreference;
return open(cameraNum);
}
bool VideoCapture::isOpened() const
{
return (!cap.empty() || !icap.empty());
}
void VideoCapture::release()
{
CV_TRACE_FUNCTION();
icap.release();
cap.release();
}
bool VideoCapture::grab()
{
CV_INSTRUMENT_REGION()
if (!icap.empty())
return icap->grabFrame();
return cvGrabFrame(cap) != 0;
}
bool VideoCapture::retrieve(OutputArray image, int channel)
{
CV_INSTRUMENT_REGION()
if (!icap.empty())
return icap->retrieveFrame(channel, image);
IplImage* _img = cvRetrieveFrame(cap, channel);
if( !_img )
{
image.release();
return false;
}
if(_img->origin == IPL_ORIGIN_TL)
cv::cvarrToMat(_img).copyTo(image);
else
{
Mat temp = cv::cvarrToMat(_img);
flip(temp, image, 0);
}
return true;
}
bool VideoCapture::read(OutputArray image)
{
CV_INSTRUMENT_REGION()
if(grab())
retrieve(image);
else
image.release();
return !image.empty();
}
VideoCapture& VideoCapture::operator >> (Mat& image)
{
#ifdef WINRT_VIDEO
if (grab())
{
if (retrieve(image))
{
std::lock_guard<std::mutex> lock(VideoioBridge::getInstance().inputBufferMutex);
VideoioBridge& bridge = VideoioBridge::getInstance();
// double buffering
bridge.swapInputBuffers();
auto p = bridge.frontInputPtr;
bridge.bIsFrameNew = false;
// needed here because setting Mat 'image' is not allowed by OutputArray in read()
Mat m(bridge.getHeight(), bridge.getWidth(), CV_8UC3, p);
image = m;
}
}
#else
read(image);
#endif
return *this;
}
VideoCapture& VideoCapture::operator >> (UMat& image)
{
CV_INSTRUMENT_REGION()
read(image);
return *this;
}
bool VideoCapture::set(int propId, double value)
{
if (!icap.empty())
return icap->setProperty(propId, value);
return cvSetCaptureProperty(cap, propId, value) != 0;
}
double VideoCapture::get(int propId) const
{
if (!icap.empty())
return icap->getProperty(propId);
return icvGetCaptureProperty(cap, propId);
}
VideoWriter::VideoWriter()
{}
VideoWriter::VideoWriter(const String& filename, int _fourcc, double fps, Size frameSize, bool isColor)
{
open(filename, _fourcc, fps, frameSize, isColor);
}
VideoWriter::VideoWriter(const String& filename, int apiPreference, int _fourcc, double fps, Size frameSize, bool isColor)
{
open(filename, apiPreference, _fourcc, fps, frameSize, isColor);
}
void VideoWriter::release()
{
iwriter.release();
writer.release();
}
VideoWriter::~VideoWriter()
{
release();
}
bool VideoWriter::open(const String& filename, int _fourcc, double fps, Size frameSize, bool isColor)
{
return open(filename, CAP_ANY, _fourcc, fps, frameSize, isColor);
}
bool VideoWriter::open(const String& filename, int apiPreference, int _fourcc, double fps, Size frameSize, bool isColor)
{
CV_INSTRUMENT_REGION()
if (isOpened()) release();
iwriter = IVideoWriter_create(filename, apiPreference, _fourcc, fps, frameSize, isColor);
if (!iwriter.empty())
return true;
writer.reset(cvCreateVideoWriterWithPreference(filename.c_str(), apiPreference, _fourcc, fps, frameSize, isColor));
return isOpened();
}
bool VideoWriter::isOpened() const
{
return !iwriter.empty() || !writer.empty();
}
bool VideoWriter::set(int propId, double value)
{
if (!iwriter.empty())
return iwriter->setProperty(propId, value);
return false;
}
double VideoWriter::get(int propId) const
{
if (!iwriter.empty())
return iwriter->getProperty(propId);
return 0.;
}
void VideoWriter::write(const Mat& image)
{
CV_INSTRUMENT_REGION()
if( iwriter )
iwriter->write(image);
else
{
IplImage _img = image;
cvWriteFrame(writer, &_img);
}
}
VideoWriter& VideoWriter::operator << (const Mat& image)
{
CV_INSTRUMENT_REGION()
write(image);
return *this;
}
int VideoWriter::fourcc(char c1, char c2, char c3, char c4)
{
return (c1 & 255) + ((c2 & 255) << 8) + ((c3 & 255) << 16) + ((c4 & 255) << 24);
}
}