+/**
+ * Determines the socket stream path
+ */
+#define MMCAM_DISPLAY_SOCKET_PATH "display-socket-path"
+
+/**
+ * Client PID
+ */
+#define MMCAM_CLIENT_PID "client-pid"
+
+/**
+ * Root directory of application
+ */
+#define MMCAM_ROOT_DIRECTORY "root-directory"
+
+/**
+ * Bitrate for encoded preview stream
+ */
+#define MMCAM_ENCODED_PREVIEW_BITRATE "encoded-preview-bitrate"
+
+/**
+ * GOP interval for encoded preview stream
+ */
+#define MMCAM_ENCODED_PREVIEW_GOP_INTERVAL "encoded-preview-gop-interval"
+
+/**
+ * The distance to move the camera horizontally and physically
+ */
+#define MMCAM_CAMERA_PAN_MECHA "camera-pan-mecha"
+
+/**
+ * The distance to move the camera horizontally
+ */
+#define MMCAM_CAMERA_PAN_ELEC "camera-pan-elec"
+
+/**
+ * The distance to move the camera vertically and physically
+ */
+#define MMCAM_CAMERA_TILT_MECHA "camera-tilt-mecha"
+
+/**
+ * The distance to move the camera vertically
+ */
+#define MMCAM_CAMERA_TILT_ELEC "camera-tilt-elec"
+
+/**
+ * The type of PTZ(Pan Tilt Zoom). Mechanical or Electonic PTZ.
+ */
+#define MMCAM_CAMERA_PTZ_TYPE "camera-ptz-type"
+
+/**
+ * Stream type and index for sound route
+ */
+#define MMCAM_SOUND_STREAM_TYPE "sound-stream-type"
+#define MMCAM_SOUND_STREAM_INDEX "sound-stream-index"
+
+/**
+ * The display reuse flag and sink element pointer
+ */
+#define MMCAM_DISPLAY_REUSE_HINT "display-reuse-hint"
+#define MMCAM_DISPLAY_REUSE_ELEMENT "display-reuse-element"
+
+/**
+ * The GBbus connection from outside
+ */
+#define MMCAM_GDBUS_CONNECTION "gdbus-connection"
+
+/**
+ * Replay gain enable
+ */
+#define MMCAM_AUDIO_REPLAY_GAIN_ENABLE "audio-replay-gain-enable"
+
+/**
+ * Reference level for replay gain
+ */
+#define MMCAM_AUDIO_REPLAY_GAIN_REFERENCE_LEVEL "audio-replay-gain-reference-level"