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videoio: fix plugins handling if no filesystem available

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pull/20820/head
Alexander Alekhin 4 years ago
parent 13c6eb42e9
commit c49cfefe88
3 changed files with 50 additions and 31 deletions
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  1. 7
      modules/videoio/CMakeLists.txt
  2. 12
      modules/videoio/src/cap.cpp
  3. 62
      modules/videoio/src/videoio_registry.cpp

7
modules/videoio/CMakeLists.txt
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@ -1,5 +1,10 @@
set(VIDEOIO_ENABLE_PLUGINS_DEFAULT ON)
if(EMSCRIPTEN OR IOS OR WINRT)
set(VIDEOIO_ENABLE_PLUGINS_DEFAULT OFF)
endif()
set(VIDEOIO_PLUGIN_LIST "" CACHE STRING "List of videoio backends to be compiled as plugins (ffmpeg, gstreamer, mfx, msmf or special value 'all')")
set(VIDEOIO_ENABLE_PLUGINS "ON" CACHE BOOL "Allow building and using of videoio plugins")
set(VIDEOIO_ENABLE_PLUGINS "${VIDEOIO_ENABLE_PLUGINS_DEFAULT}" CACHE BOOL "Allow building and using of videoio plugins")
mark_as_advanced(VIDEOIO_PLUGIN_LIST VIDEOIO_ENABLE_PLUGINS)
string(REPLACE "," ";" VIDEOIO_PLUGIN_LIST "${VIDEOIO_PLUGIN_LIST}") # support comma-separated list (,) too

12
modules/videoio/src/cap.cpp
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@ -122,7 +122,11 @@ bool VideoCapture::open(const String& filename, int apiPreference, const std::ve
const VideoBackendInfo& info = backends[i];
if (apiPreference == CAP_ANY || apiPreference == info.id)
{
if (!info.backendFactory)
{
CV_LOG_DEBUG(NULL, "VIDEOIO(" << info.name << "): factory is not available (plugins require filesystem support)");
continue;
}
CV_CAPTURE_LOG_DEBUG(NULL,
cv::format("VIDEOIO(%s): trying capture filename='%s' ...",
info.name, filename.c_str()));
@ -232,10 +236,14 @@ bool VideoCapture::open(int cameraNum, int apiPreference, const std::vector<int>
const VideoBackendInfo& info = backends[i];
if (apiPreference == CAP_ANY || apiPreference == info.id)
{
if (!info.backendFactory)
{
CV_LOG_DEBUG(NULL, "VIDEOIO(" << info.name << "): factory is not available (plugins require filesystem support)");
continue;
}
CV_CAPTURE_LOG_DEBUG(NULL,
cv::format("VIDEOIO(%s): trying capture cameraNum=%d ...",
info.name, cameraNum));
CV_Assert(!info.backendFactory.empty());
const Ptr<IBackend> backend = info.backendFactory->getBackend();
if (!backend.empty())

62
modules/videoio/src/videoio_registry.cpp
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@ -8,6 +8,8 @@
#include "opencv2/videoio/registry.hpp"
#include "opencv2/core/utils/filesystem.private.hpp" // OPENCV_HAVE_FILESYSTEM_SUPPORT
#include "cap_librealsense.hpp"
#include "cap_dshow.hpp"
@ -34,15 +36,19 @@ namespace cv {
namespace {
#if OPENCV_HAVE_FILESYSTEM_SUPPORT && defined(ENABLE_PLUGINS)
#define DECLARE_DYNAMIC_BACKEND(cap, name, mode) \
{ \
cap, (BackendMode)(mode), 1000, name, createPluginBackendFactory(cap, name) \
}
},
#else
#define DECLARE_DYNAMIC_BACKEND(cap, name, mode) /* nothing */
#endif
#define DECLARE_STATIC_BACKEND(cap, name, mode, createCaptureFile, createCaptureCamera, createWriter) \
{ \
cap, (BackendMode)(mode), 1000, name, createBackendFactory(createCaptureFile, createCaptureCamera, createWriter) \
}
},
/** Ordering guidelines:
- modern optimized, multi-platform libraries: ffmpeg, gstreamer, Media SDK
@ -55,90 +61,90 @@ namespace {
static const struct VideoBackendInfo builtin_backends[] =
{
#ifdef HAVE_FFMPEG
DECLARE_STATIC_BACKEND(CAP_FFMPEG, "FFMPEG", MODE_CAPTURE_BY_FILENAME | MODE_WRITER, cvCreateFileCapture_FFMPEG_proxy, 0, cvCreateVideoWriter_FFMPEG_proxy),
DECLARE_STATIC_BACKEND(CAP_FFMPEG, "FFMPEG", MODE_CAPTURE_BY_FILENAME | MODE_WRITER, cvCreateFileCapture_FFMPEG_proxy, 0, cvCreateVideoWriter_FFMPEG_proxy)
#elif defined(ENABLE_PLUGINS) || defined(HAVE_FFMPEG_WRAPPER)
DECLARE_DYNAMIC_BACKEND(CAP_FFMPEG, "FFMPEG", MODE_CAPTURE_BY_FILENAME | MODE_WRITER),
DECLARE_DYNAMIC_BACKEND(CAP_FFMPEG, "FFMPEG", MODE_CAPTURE_BY_FILENAME | MODE_WRITER)
#endif
#ifdef HAVE_GSTREAMER
DECLARE_STATIC_BACKEND(CAP_GSTREAMER, "GSTREAMER", MODE_CAPTURE_ALL | MODE_WRITER, createGStreamerCapture_file, createGStreamerCapture_cam, create_GStreamer_writer),
DECLARE_STATIC_BACKEND(CAP_GSTREAMER, "GSTREAMER", MODE_CAPTURE_ALL | MODE_WRITER, createGStreamerCapture_file, createGStreamerCapture_cam, create_GStreamer_writer)
#elif defined(ENABLE_PLUGINS)
DECLARE_DYNAMIC_BACKEND(CAP_GSTREAMER, "GSTREAMER", MODE_CAPTURE_ALL | MODE_WRITER),
DECLARE_DYNAMIC_BACKEND(CAP_GSTREAMER, "GSTREAMER", MODE_CAPTURE_ALL | MODE_WRITER)
#endif
#ifdef HAVE_MFX // Media SDK
DECLARE_STATIC_BACKEND(CAP_INTEL_MFX, "INTEL_MFX", MODE_CAPTURE_BY_FILENAME | MODE_WRITER, create_MFX_capture, 0, create_MFX_writer),
DECLARE_STATIC_BACKEND(CAP_INTEL_MFX, "INTEL_MFX", MODE_CAPTURE_BY_FILENAME | MODE_WRITER, create_MFX_capture, 0, create_MFX_writer)
#elif defined(ENABLE_PLUGINS)
DECLARE_DYNAMIC_BACKEND(CAP_INTEL_MFX, "INTEL_MFX", MODE_CAPTURE_BY_FILENAME | MODE_WRITER),
DECLARE_DYNAMIC_BACKEND(CAP_INTEL_MFX, "INTEL_MFX", MODE_CAPTURE_BY_FILENAME | MODE_WRITER)
#endif
// Apple platform
#ifdef HAVE_AVFOUNDATION
DECLARE_STATIC_BACKEND(CAP_AVFOUNDATION, "AVFOUNDATION", MODE_CAPTURE_ALL | MODE_WRITER, create_AVFoundation_capture_file, create_AVFoundation_capture_cam, create_AVFoundation_writer),
DECLARE_STATIC_BACKEND(CAP_AVFOUNDATION, "AVFOUNDATION", MODE_CAPTURE_ALL | MODE_WRITER, create_AVFoundation_capture_file, create_AVFoundation_capture_cam, create_AVFoundation_writer)
#endif
// Windows
#ifdef WINRT_VIDEO
DECLARE_STATIC_BACKEND(CAP_WINRT, "WINRT", MODE_CAPTURE_BY_INDEX, 0, create_WRT_capture, 0),
DECLARE_STATIC_BACKEND(CAP_WINRT, "WINRT", MODE_CAPTURE_BY_INDEX, 0, create_WRT_capture, 0)
#endif
#ifdef HAVE_MSMF
DECLARE_STATIC_BACKEND(CAP_MSMF, "MSMF", MODE_CAPTURE_ALL | MODE_WRITER, cvCreateCapture_MSMF, cvCreateCapture_MSMF, cvCreateVideoWriter_MSMF),
DECLARE_STATIC_BACKEND(CAP_MSMF, "MSMF", MODE_CAPTURE_ALL | MODE_WRITER, cvCreateCapture_MSMF, cvCreateCapture_MSMF, cvCreateVideoWriter_MSMF)
#elif defined(ENABLE_PLUGINS) && defined(_WIN32)
DECLARE_DYNAMIC_BACKEND(CAP_MSMF, "MSMF", MODE_CAPTURE_ALL | MODE_WRITER),
DECLARE_DYNAMIC_BACKEND(CAP_MSMF, "MSMF", MODE_CAPTURE_ALL | MODE_WRITER)
#endif
#ifdef HAVE_DSHOW
DECLARE_STATIC_BACKEND(CAP_DSHOW, "DSHOW", MODE_CAPTURE_BY_INDEX, 0, create_DShow_capture, 0),
DECLARE_STATIC_BACKEND(CAP_DSHOW, "DSHOW", MODE_CAPTURE_BY_INDEX, 0, create_DShow_capture, 0)
#endif
// Linux, some Unix
#if defined HAVE_CAMV4L2
DECLARE_STATIC_BACKEND(CAP_V4L2, "V4L2", MODE_CAPTURE_ALL, create_V4L_capture_file, create_V4L_capture_cam, 0),
DECLARE_STATIC_BACKEND(CAP_V4L2, "V4L2", MODE_CAPTURE_ALL, create_V4L_capture_file, create_V4L_capture_cam, 0)
#elif defined HAVE_VIDEOIO
DECLARE_STATIC_BACKEND(CAP_V4L, "V4L_BSD", MODE_CAPTURE_ALL, create_V4L_capture_file, create_V4L_capture_cam, 0),
DECLARE_STATIC_BACKEND(CAP_V4L, "V4L_BSD", MODE_CAPTURE_ALL, create_V4L_capture_file, create_V4L_capture_cam, 0)
#endif
// RGB-D universal
#ifdef HAVE_OPENNI2
DECLARE_STATIC_BACKEND(CAP_OPENNI2, "OPENNI2", MODE_CAPTURE_ALL, create_OpenNI2_capture_file, create_OpenNI2_capture_cam, 0),
DECLARE_STATIC_BACKEND(CAP_OPENNI2, "OPENNI2", MODE_CAPTURE_ALL, create_OpenNI2_capture_file, create_OpenNI2_capture_cam, 0)
#endif
#ifdef HAVE_LIBREALSENSE
DECLARE_STATIC_BACKEND(CAP_REALSENSE, "INTEL_REALSENSE", MODE_CAPTURE_BY_INDEX, 0, create_RealSense_capture, 0),
DECLARE_STATIC_BACKEND(CAP_REALSENSE, "INTEL_REALSENSE", MODE_CAPTURE_BY_INDEX, 0, create_RealSense_capture, 0)
#endif
// OpenCV file-based only
DECLARE_STATIC_BACKEND(CAP_IMAGES, "CV_IMAGES", MODE_CAPTURE_BY_FILENAME | MODE_WRITER, create_Images_capture, 0, create_Images_writer),
DECLARE_STATIC_BACKEND(CAP_OPENCV_MJPEG, "CV_MJPEG", MODE_CAPTURE_BY_FILENAME | MODE_WRITER, createMotionJpegCapture, 0, createMotionJpegWriter),
DECLARE_STATIC_BACKEND(CAP_IMAGES, "CV_IMAGES", MODE_CAPTURE_BY_FILENAME | MODE_WRITER, create_Images_capture, 0, create_Images_writer)
DECLARE_STATIC_BACKEND(CAP_OPENCV_MJPEG, "CV_MJPEG", MODE_CAPTURE_BY_FILENAME | MODE_WRITER, createMotionJpegCapture, 0, createMotionJpegWriter)
// special interfaces / stereo cameras / other SDKs
#if defined(HAVE_DC1394_2)
DECLARE_STATIC_BACKEND(CAP_FIREWIRE, "FIREWIRE", MODE_CAPTURE_BY_INDEX, 0, create_DC1394_capture, 0),
DECLARE_STATIC_BACKEND(CAP_FIREWIRE, "FIREWIRE", MODE_CAPTURE_BY_INDEX, 0, create_DC1394_capture, 0)
#endif
// GigE
#ifdef HAVE_PVAPI
DECLARE_STATIC_BACKEND(CAP_PVAPI, "PVAPI", MODE_CAPTURE_BY_INDEX, 0, create_PvAPI_capture, 0),
DECLARE_STATIC_BACKEND(CAP_PVAPI, "PVAPI", MODE_CAPTURE_BY_INDEX, 0, create_PvAPI_capture, 0)
#endif
#ifdef HAVE_XIMEA
DECLARE_STATIC_BACKEND(CAP_XIAPI, "XIMEA", MODE_CAPTURE_ALL, create_XIMEA_capture_file, create_XIMEA_capture_cam, 0),
DECLARE_STATIC_BACKEND(CAP_XIAPI, "XIMEA", MODE_CAPTURE_ALL, create_XIMEA_capture_file, create_XIMEA_capture_cam, 0)
#endif
#ifdef HAVE_ARAVIS_API
DECLARE_STATIC_BACKEND(CAP_ARAVIS, "ARAVIS", MODE_CAPTURE_BY_INDEX, 0, create_Aravis_capture, 0),
DECLARE_STATIC_BACKEND(CAP_ARAVIS, "ARAVIS", MODE_CAPTURE_BY_INDEX, 0, create_Aravis_capture, 0)
#endif
#ifdef HAVE_UEYE // uEye
DECLARE_STATIC_BACKEND(CAP_UEYE, "UEYE", MODE_CAPTURE_BY_INDEX, 0, create_ueye_camera, 0),
DECLARE_STATIC_BACKEND(CAP_UEYE, "UEYE", MODE_CAPTURE_BY_INDEX, 0, create_ueye_camera, 0)
#elif defined(ENABLE_PLUGINS)
DECLARE_DYNAMIC_BACKEND(CAP_UEYE, "UEYE", MODE_CAPTURE_BY_INDEX),
DECLARE_DYNAMIC_BACKEND(CAP_UEYE, "UEYE", MODE_CAPTURE_BY_INDEX)
#endif
#ifdef HAVE_GPHOTO2
DECLARE_STATIC_BACKEND(CAP_GPHOTO2, "GPHOTO2", MODE_CAPTURE_ALL, createGPhoto2Capture, createGPhoto2Capture, 0),
DECLARE_STATIC_BACKEND(CAP_GPHOTO2, "GPHOTO2", MODE_CAPTURE_ALL, createGPhoto2Capture, createGPhoto2Capture, 0)
#endif
#ifdef HAVE_XINE
DECLARE_STATIC_BACKEND(CAP_XINE, "XINE", MODE_CAPTURE_BY_FILENAME, createXINECapture, 0, 0),
DECLARE_STATIC_BACKEND(CAP_XINE, "XINE", MODE_CAPTURE_BY_FILENAME, createXINECapture, 0, 0)
#endif
#if defined(HAVE_ANDROID_MEDIANDK) || defined(HAVE_ANDROID_NATIVE_CAMERA)
DECLARE_STATIC_BACKEND(CAP_ANDROID, "ANDROID_NATIVE",
@ -163,7 +169,7 @@ static const struct VideoBackendInfo builtin_backends[] =
#else
0,
#endif
0),
0)
#endif
// dropped backends: MIL, TYZX
};

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