mirror of
https://github.com/FFmpeg/FFmpeg.git
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117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
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* Copyright (c) 2020
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_DNN_QUEUE_H
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#define AVFILTER_DNN_QUEUE_H
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/**
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* Linear double-ended data structure
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*/
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typedef struct Queue Queue;
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/**
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* @brief Create a Queue instance.
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* It initializes the length of the Queue as 0.
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*
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* @return Pointer to the Queue
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* @retval NULL if allocation fails
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*/
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Queue *ff_queue_create(void);
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/**
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* @brief Destroy the Queue instance.
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* It also frees all elements of the Queue.
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*/
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void ff_queue_destroy(Queue *q);
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/**
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* @brief Return the length of the Queue
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*/
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size_t ff_queue_size(Queue *q);
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/**
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* @brief Return a pointer to the data
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* at the head of the queue.
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*
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* @retval NULL if null pointer was passed
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* or queue is empty
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*/
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void *ff_queue_peek_front(Queue *q);
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/**
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* @brief Return a pointer to the data at
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* the tail of the queue.
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*
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* @retval NULL if null pointer was passed
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* or queue is empty
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*/
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void *ff_queue_peek_back(Queue *q);
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/**
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* @brief Add data to the head of the queue.
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* It increases the length of Queue by one.
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*
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* @param q pointer to the Queue.
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* @param v data to be added
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* @return The length of the Queue
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* @retval 0 if the pointer to queue is NULL
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* @retval -1 if new entry cannot be created
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*/
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int ff_queue_push_front(Queue *q, void *v);
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/**
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* @brief Add data to the tail of the queue.
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* It increases the length of Queue by one.
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*
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* @param q pointer to the Queue
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* @param v data to be added
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* @return The length of the Queue
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* @retval 0 if the pointer to queue is NULL
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* @retval -1 if new entry cannot be created
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*/
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int ff_queue_push_back(Queue *q, void *v);
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/**
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* @brief Remove and free first element from
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* the Queue. It shrinks the length of Queue
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* by one.
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*
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* @param q pointer to the Queue.
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* @return The value of first element as void.
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* If a null pointer or empty queue is passed,
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* it returns NULL
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*/
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void *ff_queue_pop_front(Queue *q);
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/**
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* @brief Remove and free last element from
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* the Queue. It shrinks the length of Queue
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* by one.
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*
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* @param q pointer to the Queue.
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* @return The value of last element as void.
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* If a null pointer or empty queue is passed,
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* it returns NULL
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*/
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void *ff_queue_pop_back(Queue *q);
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#endif
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