+struct bt_notification;
+struct bt_notification_iterator;
+struct bt_component;
+struct bt_component_factory;
+struct bt_value;
+
+typedef enum bt_component_status (*bt_plugin_init_func)(
+ struct bt_component_factory *factory);
+typedef void (*bt_plugin_exit_func)(void);
+
+/**
+ * Component private data deallocation function type.
+ *
+ * @param component Component instance
+ */
+typedef void (*bt_component_destroy_cb)(struct bt_component *component);
+
+/**
+ * Component initialization function type.
+ *
+ * A component's private data and required callbacks must be set by this
+ * function.
+ *
+ * @param component Component instance
+ * @param params A dictionary of component parameters
+ * @returns One of #bt_component_status values
+ */
+typedef enum bt_component_status (*bt_component_init_cb)(
+ struct bt_component *component, struct bt_value *params);
+
+/**
+ * Get a component's private data.
+ *
+ * @param component Component of which to get the private data
+ * @returns Component's private data
+ */
+extern void *bt_component_get_private_data(struct bt_component *component);
+
+/**
+ * Set a component's private data.
+ *
+ * @param component Component of which to set the private data
+ * @param data Component private data
+ * @returns One of #bt_component_status values
+ */
+extern enum bt_component_status bt_component_set_private_data(
+ struct bt_component *component, void *data);
+
+/**
+ * Set a component's private data cleanup function.
+ *
+ * @param component Component of which to set the private data destruction
+ * function
+ * @param data Component private data clean-up function
+ * @returns One of #bt_component_status values
+ */
+extern enum bt_component_status bt_component_set_destroy_cb(
+ struct bt_component *component,
+ bt_component_destroy_cb destroy);
+
+/** bt_component_souce */
+/**
+ * Iterator initialization function type.
+ *
+ * A notification iterator's private data, deinitialization, next, and get
+ * callbacks must be set by this function.
+ *
+ * @param source Source component instance
+ * @param iterator Notification iterator instance
+ */
+typedef enum bt_component_status (*bt_component_source_init_iterator_cb)(
+ struct bt_component *, struct bt_notification_iterator *);
+
+/**
+ * Set a source component's iterator initialization function.
+ *
+ * @param source Source component instance
+ * @param init_iterator Notification iterator initialization callback
+ */
+extern enum bt_component_status
+bt_component_source_set_iterator_init_cb(struct bt_component *source,
+ bt_component_source_init_iterator_cb init_iterator);
+
+/** bt_component_sink */
+/**
+ * Notification consumption function type.
+ *
+ * @param sink Sink component instance
+ * @returns One of #bt_component_status values
+ */
+typedef enum bt_component_status (*bt_component_sink_consume_cb)(
+ struct bt_component *);
+
+/**
+ * Iterator addition function type.
+ *
+ * A sink component may choose to refuse the addition of an iterator
+ * by not returning BT_COMPONENT_STATUS_OK.
+ *
+ * @param sink Sink component instance
+ * @returns One of #bt_component_status values
+ */
+typedef enum bt_component_status (*bt_component_sink_add_iterator_cb)(
+ struct bt_component *, struct bt_notification_iterator *);
+
+/**
+ * Set a sink component's consumption callback.
+ *
+ * @param sink Sink component instance
+ * @param consume Consumption callback
+ * @returns One of #bt_component_status values
+ */
+extern enum bt_component_status
+bt_component_sink_set_consume_cb(struct bt_component *sink,
+ bt_component_sink_consume_cb consume);
+
+/**
+ * Set a sink component's iterator addition callback.
+ *
+ * @param sink Sink component instance
+ * @param add_iterator Iterator addition callback
+ * @returns One of #bt_component_status values
+ */
+extern enum bt_component_status
+bt_component_sink_set_add_iterator_cb(struct bt_component *sink,
+ bt_component_sink_add_iterator_cb add_iterator);
+
+/* Defaults to 1. */
+extern enum bt_component_status
+bt_component_sink_set_minimum_input_count(struct bt_component *sink,
+ unsigned int minimum);
+
+/* Defaults to 1. */
+extern enum bt_component_status
+bt_component_sink_set_maximum_input_count(struct bt_component *sink,
+ unsigned int maximum);
+
+extern enum bt_component_status
+bt_component_sink_get_input_count(struct bt_component *sink,
+ unsigned int *count);
+
+/* May return NULL after an interator has reached its end. */
+extern enum bt_component_status
+bt_component_sink_get_input_iterator(struct bt_component *sink,
+ unsigned int input, struct bt_notification_iterator **iterator);
+
+/** bt_notification_iterator */
+/**
+ * Function returning an iterator's current notification.
+ *
+ * @param iterator Notification iterator instance
+ * @returns A notification instance
+ */
+typedef struct bt_notification *(*bt_notification_iterator_get_cb)(
+ struct bt_notification_iterator *iterator);
+