lavfi/dnn/queue.h: Add Documentation to Queue

Documentation for Queue

Signed-off-by: Shubhanshu Saxena <shubhanshu.e01@gmail.com>

libavfilter/dnn/queue.h

@@ -22,20 +22,95 @@
 #ifndef AVFILTER_DNN_QUEUE_H
 #define AVFILTER_DNN_QUEUE_H
 
+/**
+ * Linear double-ended data structure
+ */
 typedef struct Queue Queue;
 
+/**
+ * @brief Create a Queue instance.
+ * It initializes the length of the Queue as 0.
+ *
+ * @return Pointer to the Queue
+ * @retval NULL if allocation fails
+ */
 Queue *ff_queue_create(void);
+
+/**
+ * @brief Destroy the Queue instance.
+ * It also frees all elements of the Queue.
+ */
 void ff_queue_destroy(Queue *q);
 
+/**
+ * @brief Return the length of the Queue
+ */
 size_t ff_queue_size(Queue *q);
 
+/**
+ * @brief Return a pointer to the data
+ * at the head of the queue.
+ *
+ * @retval NULL if null pointer was passed
+ * or queue is empty
+ */
 void *ff_queue_peek_front(Queue *q);
+
+/**
+ * @brief Return a pointer to the data at
+ * the tail of the queue.
+ *
+ * @retval NULL if null pointer was passed
+ * or queue is empty
+ */
 void *ff_queue_peek_back(Queue *q);
 
+/**
+ * @brief Add data to the head of the queue.
+ * It increases the length of Queue by one.
+ *
+ * @param q pointer to the Queue.
+ * @param v data to be added
+ * @return The length of the Queue
+ * @retval 0 if the pointer to queue is NULL
+ * @retval -1 if new entry cannot be created
+ */
 int ff_queue_push_front(Queue *q, void *v);
+
+/**
+ * @brief Add data to the tail of the queue.
+ * It increases the length of Queue by one.
+ *
+ * @param q pointer to the Queue
+ * @param v data to be added
+ * @return The length of the Queue
+ * @retval 0 if the pointer to queue is NULL
+ * @retval -1 if new entry cannot be created
+ */
 int ff_queue_push_back(Queue *q, void *v);
 
+/**
+ * @brief Remove and free first element from
+ * the Queue. It shrinks the length of Queue
+ * by one.
+ *
+ * @param q pointer to the Queue.
+ * @return The value of first element as void.
+ * If a null pointer or empty queue is passed,
+ * it returns NULL
+ */
 void *ff_queue_pop_front(Queue *q);
+
+/**
+ * @brief Remove and free last element from
+ * the Queue. It shrinks the length of Queue
+ * by one.
+ *
+ * @param q pointer to the Queue.
+ * @return The value of last element as void.
+ * If a null pointer or empty queue is passed,
+ * it returns NULL
+ */
 void *ff_queue_pop_back(Queue *q);
 
 #endif