Merge "Explicit define getFrameAtIndex as pure virtual function."

            int index, int colorFormat, bool metaOnly) = 0;

    virtual status_t getFrameAtIndex(

            std::vector<VideoFrame*>* frames,

            int frameIndex, int numFrames, int colorFormat, bool metaOnly);

            int frameIndex, int numFrames, int colorFormat, bool metaOnly) = 0;

    virtual MediaAlbumArt* extractAlbumArt() = 0;

    virtual const char* extractMetadata(int keyCode) = 0;

};