GStreamer on Android

ramajd

I build the GStreamer library including the Qt bindings, using the GStreamer's documents. and the QT5 plugin became available in the provided bundle.

now when I try to build the libgstreamer_android.so using the NDK, when I add the GSTREAMER_PLUGINS_QT5 plugin to the Android.mk I receive a series of undefined reference linker issues about missing the Qt libraries.

...
../gstqsgtexture.cc:36: error: undefined reference to 'QSGTexture::QSGTexture()'
../gstqsgtexture.cc:36: error: undefined reference to 'QOpenGLFunctions::QOpenGLFunctions()'
../gstqsgtexture.cc:40: error: undefined reference to 'QOpenGLFunctions::initializeOpenGLFunctions()'
../gstqsgtexture.cc:55: error: undefined reference to 'QSGTexture::~QSGTexture()'
../gstqsgtexture.cc:64: error: undefined reference to 'QOpenGLContext::functions() const'
../gstqsgtexture.cc:67: error: undefined reference to 'QSGTexture::~QSGTexture()'
../gstqsgtexture.cc:67: error: undefined reference to 'QSGTexture::~QSGTexture()'
../gstqsgtexture.cc:172: error: undefined reference to 'QOpenGLContext::functions() const'
armeabi-v7a/moc_gstqsgtexture.cpp:88: error: undefined reference to 'QSGTexture::qt_metacast(char const*)'
armeabi-v7a/moc_gstqsgtexture.cpp:93: error: undefined reference to 'QSGTexture::qt_metacall(QMetaObject::Call, int, void**)'
/home/reza/QtProjects/GStreamerTest/gstreamer-1.0/armv7/lib/gstreamer-1.0/libgstqmlgl.a(moc_gstqsgtexture.o):moc_gstqsgtexture.cpp:GstQSGTexture::staticMetaObject: error: undefined reference to 'QSGTexture::staticMetaObject'
/home/reza/QtProjects/GStreamerTest/gstreamer-1.0/armv7/lib/gstreamer-1.0/libgstqmlgl.a(moc_gstqsgtexture.o):moc_gstqsgtexture.cpp:vtable for GstQSGTexture: error: undefined reference to 'QSGTexture::normalizedTextureSubRect() const'
/home/reza/QtProjects/GStreamerTest/gstreamer-1.0/armv7/lib/gstreamer-1.0/libgstqmlgl.a(moc_gstqsgtexture.o):moc_gstqsgtexture.cpp:vtable for GstQSGTexture: error: undefined reference to 'QSGTexture::isAtlasTexture() const'
/home/reza/QtProjects/GStreamerTest/gstreamer-1.0/armv7/lib/gstreamer-1.0/libgstqmlgl.a(moc_gstqsgtexture.o):moc_gstqsgtexture.cpp:vtable for GstQSGTexture: error: undefined reference to 'QSGTexture::removedFromAtlas() const'
/home/reza/QtProjects/GStreamerTest/gstreamer-1.0/armv7/lib/gstreamer-1.0/libgstqmlgl.a(moc_gstqsgtexture.o):moc_gstqsgtexture.cpp:typeinfo for GstQSGTexture: error: undefined reference to 'typeinfo for QSGTexture'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

does anyone guide me on how I can resolve these linker issues?

reference to the Makefile that I'm using: https://github.com/ramajd/gstreamer-qt-android/blob/f7a3b3088fa16f255e5d0ba9972639447f0c91d8/android/jni/Android.mk

Liffu

Hello,

I am having same issue and spend 2 whole days trying to solve this, did you manage to get some sort of solution in the end?

JoeCFD

@Liffu Did you build gstreamer for Android? If yes, it may not be necessary. You can download any prebuilt version from here.
https://gstreamer.freedesktop.org/data/pkg/android/

Show how you add gstreamer libs and plugins to your build.
QSGTexture is in module quick from here:
https://doc.qt.io/qt-5/qsgtexture.html
Add quick module into your build and the problem could be gone. I guess the module is needed by qml 5/6 sink inside gstreamer.

make sure this module is wrapped into the pkg file.