+
+ /** Audio class driver callback for the setting and retrieval of streaming endpoint properties. This callback must be implemented
+ * in the user application to handle property manipulations on streaming audio endpoints.
+ *
+ * When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for
+ * the given endpoint index, and should return as fast as possible. When non-NULL, this value may be altered for GET operations
+ * to indicate the size of the retreived data.
+ *
+ * \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value
+ * of the \c DataLength parameter.
+ *
+ * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
+ * \param[in] EndpointProperty Property of the endpoint to get or set, a value from \ref Audio_ClassRequests_t.
+ * \param[in] EndpointAddress Address of the streaming endpoint whose property is being referenced.
+ * \param[in] EndpointControl Parameter of the endpoint to get or set, a value from \ref Audio_EndpointControls_t.
+ * \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum
+ * length of the retrieved data. When NULL, the function should return whether the given property
+ * and parameter is valid for the requested endpoint without reading or modifying the Data buffer.
+ * \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where
+ * the retrieved data is to be stored for GET operations.
+ *
+ * \return Boolean true if the property get/set was successful, false otherwise
+ */
+ bool CALLBACK_Audio_Device_GetSetEndpointProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
+ const uint8_t EndpointProperty,
+ const uint8_t EndpointAddress,
+ const uint8_t EndpointControl,
+ uint16_t* const DataLength,
+ uint8_t* Data);
+
+ /** Audio class driver event for an Audio Stream start/stop change. This event fires each time the device receives a stream enable or
+ * disable control request from the host, to start and stop the audio stream. The current state of the stream can be determined by the
+ * State.InterfaceEnabled value inside the Audio interface structure passed as a parameter.
+ *
+ * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
+ */
+ void EVENT_Audio_Device_StreamStartStop(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo);