+int _mmplayer_get_streaming_buffering_time(MMHandleType hplayer, int *prebuffer_ms, int *rebuffer_ms);
+int _mmplayer_set_codec_type(MMHandleType hplayer, mmplayer_stream_type_e stream_type, mmplayer_codec_type_e codec_type);
+int _mmplayer_set_replaygain_enabled(MMHandleType hplayer, bool enabled);
+int _mmplayer_is_replaygain_enabled(MMHandleType hplayer, bool *enabled);
+int _mmplayer_set_video_roi_area(MMHandleType hplayer, double scale_x, double scale_y, double scale_width, double scale_height);
+int _mmplayer_get_video_roi_area(MMHandleType hplayer, double *scale_x, double *scale_y, double *scale_width, double *scale_height);
+int _mmplayer_audio_offload_is_activated(MMHandleType hplayer, bool *activated);
+int _mmplayer_is_audio_control_available(MMHandleType hplayer, mmplayer_audio_control_opt_e opt, bool *available);
+
+/* internal */
+void _mmplayer_bus_msg_thread_destroy(MMHandleType hplayer);
+void _mmplayer_bus_watcher_remove(MMHandleType hplayer);
+void _mmplayer_watcher_removed_notify(gpointer data);
+void _mmplayer_set_state(mmplayer_t *player, int state);
+int _mmplayer_check_state(mmplayer_t *player, mmplayer_command_state_e command);
+gboolean _mmplayer_update_content_attrs(mmplayer_t *player, enum content_attr_flag flag);
+void _mmplayer_cancel_eos_timer(mmplayer_t *player);
+void _mmplayer_audio_stream_clear_buffer(mmplayer_t *player, gboolean send_all);
+MMStreamingType _mmplayer_get_stream_service_type(mmplayer_t *player);
+int _mmplayer_get_video_angle(mmplayer_t *player, int *display_angle, int *orientations);
+gboolean _mmplayer_gst_remove_fakesink(mmplayer_t *player, mmplayer_gst_element_t *fakesink);
+void _mmplayer_add_signal_connection(mmplayer_t *player, GObject *object, mmplayer_signal_type_e type, const gchar *signal, GCallback cb_funct, gpointer u_data);
+void _mmplayer_gst_decode_pad_added(GstElement *elem, GstPad *pad, gpointer data);
+gint _mmplayer_gst_decode_autoplug_select(GstElement *bin, GstPad *pad, GstCaps *caps, GstElementFactory *factory, gpointer data);
+GValueArray *_mmplayer_gst_decode_autoplug_sort(GstElement *bin, GstPad *pad, GstCaps *caps, GValueArray *factories, gpointer data);
+gboolean _mmplayer_gst_create_decoder(mmplayer_t *player, GstPad *srcpad, const GstCaps *caps);
+void _mmplayer_gst_element_added(GstElement *bin, GstElement *element, gpointer data);
+GstElement *_mmplayer_gst_make_decodebin(mmplayer_t *player);
+int _mmplayer_gst_element_add_bucket_to_bin(GstBin *bin, GList *element_bucket);
+int _mmplayer_gst_element_link_bucket(GList *element_bucket);
+void _mmplayer_typefind_have_type(GstElement *tf, guint probability, GstCaps *caps, gpointer data);
+int _mmplayer_parse_profile(const char *uri, void *param, mmplayer_parse_profile_t *data);
+int _mmplayer_set_client_pid(MMHandleType hplayer, int pid);
+void _mmplayer_set_reconfigure_state(mmplayer_t *player, gboolean state);
+void _mmplayer_gst_decode_pad_removed(GstElement *elem, GstPad *new_pad, gpointer data);
+void _mmplayer_gst_decode_no_more_pads(GstElement *elem, gpointer data);
+void _mmplayer_gst_decode_drained(GstElement *bin, gpointer data);
+void _mmplayer_gst_about_to_finish(GstElement *bin, gpointer data);
+int _mmplayer_update_not_supported_codec_info(mmplayer_t *player, const gchar *factory_class, const gchar *mime);
+void _mmplayer_gst_decode_unknown_type(GstElement *elem, GstPad *pad, GstCaps *caps, gpointer data);
+gboolean _mmplayer_gst_decode_autoplug_continue(GstElement *bin, GstPad *pad, GstCaps *caps, gpointer data);
+void _mmplayer_pipeline_complete(GstElement *decodebin, gpointer data);
+void _mmplayer_set_audio_attrs(mmplayer_t *player, GstCaps *caps);
+int _mmplayer_acquire_hw_resource(mmplayer_t *player, mmplayer_resource_type_e type);