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videoio: CAP_PROP_BACKEND property interface

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This commit is contained in:
Alexander Alekhin 2018-09-18 16:25:01 +00:00
parent 51f7eb3a3c
commit d3eed2cf23
2 changed files with 27 additions and 0 deletions
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1
modules/videoio/include/opencv2/videoio.hpp
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@ -169,6 +169,7 @@ enum VideoCaptureProperties {
CAP_PROP_AUTOFOCUS =39,
CAP_PROP_SAR_NUM =40, //!< Sample aspect ratio: num/den (num)
CAP_PROP_SAR_DEN =41, //!< Sample aspect ratio: num/den (den)
CAP_PROP_BACKEND =42, //!< current backend (enum VideoCaptureAPIs). Read-only property
#ifndef CV_DOXYGEN
CV__CAP_PROP_LATEST
#endif

26
modules/videoio/src/cap.cpp
View File

@ -272,6 +272,8 @@ VideoCapture& VideoCapture::operator >> (UMat& image)
bool VideoCapture::set(int propId, double value)
{
CV_CheckNE(propId, (int)CAP_PROP_BACKEND, "Can set read-only property");
if (!icap.empty())
return icap->setProperty(propId, value);
return cvSetCaptureProperty(cap, propId, value) != 0;
@ -279,6 +281,17 @@ bool VideoCapture::set(int propId, double value)
double VideoCapture::get(int propId) const
{
if (propId == CAP_PROP_BACKEND)
{
int api = 0;
if (icap)
api = icap->isOpened() ? icap->getCaptureDomain() : 0;
else if (cap)
api = cap->getCaptureDomain();
if (api <= 0)
return -1.0;
return (double)api;
}
if (!icap.empty())
return icap->getProperty(propId);
return cap ? cap->getProperty(propId) : 0;
@ -358,6 +371,8 @@ bool VideoWriter::isOpened() const
bool VideoWriter::set(int propId, double value)
{
CV_CheckNE(propId, (int)CAP_PROP_BACKEND, "Can set read-only property");
if (!iwriter.empty())
return iwriter->setProperty(propId, value);
return false;
@ -365,6 +380,17 @@ bool VideoWriter::set(int propId, double value)
double VideoWriter::get(int propId) const
{
if (propId == CAP_PROP_BACKEND)
{
int api = 0;
if (iwriter)
api = iwriter->getCaptureDomain();
else if (writer)
api = writer->getCaptureDomain();
if (api <= 0)
return -1.0;
return (double)api;
}
if (!iwriter.empty())
return iwriter->getProperty(propId);
return 0.;