For learning language repeat playback media files.

• only support Qt4 with Phonon

mkdir build
cmake ../
make
make install

1. Download Qt4.8 compiled by MinGW from qt-project
2. Download CMake
3. Download GCC4.4, Qt4.8 compiled by MinGW only support MinGW 4.4

4. Install above toolchain and compile.

   Run in Window:

   ``cmake -G"MinGW Makefiles" ../``

5. copy below dlls from MinGW and QT directory into running directory:

• libgcc_s_dw2-1.dll
• mingwm10.dll
• phonon4.dll
• QtCore4.dll
• QtGui4.dll
• QtNetwork4.dll
• QtWebKit4.dll
• phonon_backend
• imageformats
• iconengines

Catching a message "WARNING: bool Phonon::FactoryPrivate::createBackend() phonon backend plugin could not be loaded", phonon don't find its backend.

To check phonon backend path, set enviroment various:

export PHONON_DEBUG=5

and run application in console. It will show phonon searching path, such as:

bool Phonon::FactoryPrivate::createBackend() "/usr/lib/qt/plugins/phonon_backend" does not exist

It said it is invalid path of phonon backend. To correct it, set:

export QT_PLUGIN_PATH=${QT_PLUGIN_PATH}:/usr/lib/your_path/plugins

such as:

export QT_PLUGIN_PATH=${QT_PLUGIN_PATH}:/usr/lib/kde4/plugins

export PHONON_BACKEND=phonon_gstreamer
export PHONON_BACKEND=phonon_mplayer
export PHONON_BACKEND=phonon_xine

• Use QtMultimedia to support Qt5
• Add sound wave window for audio output and input

Please follow GPLv3. Thanks.