How to compile opencv gstreamer plugins for android?

[evaluat0r]

Lulek wrote
> Hi, i am trying to compile opencv gstreamer plugins from gst-plugins-bad
> for
> android. I followed the instructions on
> https://gstreamer.freedesktop.org/documentation/installing/building-from-source-using-cerbero.html?gi-language=c
> and built gstreamer with cerbero. I downloaded and compiled opencv v3.4.6
> (i
> also tried with many other versions, but its always the same problem) for
> android and added the generated opencv.pc to pkg config path (and also
> opencv2 directory to the standard path .../arm64/include/gstreamer-1.0).
> To
> save some time i also modified makefile.am to compile only one plugin
> gstcvdilate.cpp:
> 
> plugin_LTLIBRARIES = libgstopencv.la
> CXXFLAGS += -frtti -fexceptions
> 
> # sources used to compile this plug-in
>             
> libgstopencv_la_SOURCES = gstcvdilate.cpp #gstopencv.cpp
> 
> libgstopencv_la_CXXFLAGS = \
>     -I$(top_srcdir)/gst-libs \
>     -I$(top_builddir)/gst-libs \
>     $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CXXFLAGS)
> $(OPENCV_CFLAGS) \
>    
> -DGST_HAAR_CASCADES_DIR=\"$(pkgdatadir)/@GST_API_VERSION@/opencv_haarcascades\"
> 
> # flags used to compile this facedetect
> # add other _CFLAGS and _LIBS as needed
> #
> # override CV_INLINE: GLib will take care of defining 'inline'
> sufficiently
> and
> # OpenCV's define isn't good enough to avoid 'unused' gcc warnings (at
> v2.1.0)
> libgstopencv_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) \
>     $(GST_CFLAGS) $(OPENCV_CFLAGS) \
>     -DCV_INLINE="static inline" \
>     -DCV_NO_BACKWARD_COMPATIBILITY
> 
> libgstopencv_la_LIBADD = \
>     $(top_builddir)/gst-libs/gst/opencv/libgstopencv-$(GST_API_VERSION).la
> \
>     $(GST_LIBS) $(GST_BASE_LIBS) $(OPENCV_LIBS) \
>     $(GSTPB_BASE_LIBS) -lgstvideo-$(GST_API_VERSION) -lstdc++
> 
> libgstopencv_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
> libgstopencv_la_LIBTOOLFLAGS = --tag=disable-static
> 
> # headers we need but don't want installed
> noinst_HEADERS = gstcvdilate.h gstcvdilateerode.h
> 
> 
> opencv_haarcascadesdir =
> $(pkgdatadir)/$(GST_API_VERSION)/opencv_haarcascades
> opencv_haarcascades_DATA = fist.xml palm.xml
> 
> EXTRA_DIST = $(opencv_haarcascades_DATA) 
> 
> but when i try to compile this plugin with make it always gives this error
> (and many more linker errors if i try more plugins):
> 
> <http://gstreamer-devel.966125.n4.nabble.com/file/t379578/VirtualBoxVM_XJmc7gU6vR.png> 
> 
> Can anyone help me? I've been trying to compile opencv plugins for a month
> now but no luck. Thanks in advance.
> 
> 
> 
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You need to provide a visible definition of your dilate erode function that
can't be found. That's why compilation fails.



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