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175 lines
4.2 KiB
C
175 lines
4.2 KiB
C
/*
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* Generic frame queue
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* Copyright (c) 2016 Nicolas George
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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 License
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* 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
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* GNU 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 License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_FRAMEQUEUE_H
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#define AVFILTER_FRAMEQUEUE_H
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/**
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* FFFrameQueue: simple AVFrame queue API
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*
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* Note: this API is not thread-safe. Concurrent access to the same queue
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* must be protected by a mutex or any synchronization mechanism.
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*/
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#include "libavutil/frame.h"
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typedef struct FFFrameBucket {
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AVFrame *frame;
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} FFFrameBucket;
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/**
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* Structure to hold global options and statistics for frame queues.
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*
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* This structure is intended to allow implementing global control of the
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* frame queues, including memory consumption caps.
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*
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* It is currently empty.
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*/
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typedef struct FFFrameQueueGlobal {
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char dummy; /* C does not allow empty structs */
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} FFFrameQueueGlobal;
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/**
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* Queue of AVFrame pointers.
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*/
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typedef struct FFFrameQueue {
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/**
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* Array of allocated buckets, used as a circular buffer.
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*/
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FFFrameBucket *queue;
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/**
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* Size of the array of buckets.
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*/
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size_t allocated;
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/**
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* Tail of the queue.
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* It is the index in the array of the next frame to take.
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*/
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size_t tail;
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/**
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* Number of currently queued frames.
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*/
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size_t queued;
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/**
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* Pre-allocated bucket for queues of size 1.
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*/
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FFFrameBucket first_bucket;
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/**
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* Total number of frames entered in the queue.
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*/
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uint64_t total_frames_head;
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/**
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* Total number of frames dequeued from the queue.
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* queued = total_frames_head - total_frames_tail
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*/
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uint64_t total_frames_tail;
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/**
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* Total number of samples entered in the queue.
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*/
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uint64_t total_samples_head;
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/**
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* Total number of samples dequeued from the queue.
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* queued_samples = total_samples_head - total_samples_tail
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*/
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uint64_t total_samples_tail;
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} FFFrameQueue;
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/**
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* Init a global structure.
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*/
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void ff_framequeue_global_init(FFFrameQueueGlobal *fqg);
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/**
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* Init a frame queue and attach it to a global structure.
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*/
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void ff_framequeue_init(FFFrameQueue *fq, FFFrameQueueGlobal *fqg);
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/**
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* Free the queue and all queued frames.
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*/
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void ff_framequeue_free(FFFrameQueue *fq);
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/**
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* Add a frame.
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* @return >=0 or an AVERROR code.
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*/
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int ff_framequeue_add(FFFrameQueue *fq, AVFrame *frame);
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/**
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* Take the first frame in the queue.
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* Must not be used with empty queues.
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*/
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AVFrame *ff_framequeue_take(FFFrameQueue *fq);
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/**
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* Access a frame in the queue, without removing it.
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* The first frame is numbered 0; the designated frame must exist.
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*/
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AVFrame *ff_framequeue_peek(FFFrameQueue *fq, size_t idx);
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/**
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* Get the number of queued frames.
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*/
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static inline size_t ff_framequeue_queued_frames(const FFFrameQueue *fq)
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{
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return fq->queued;
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}
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/**
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* Get the number of queued samples.
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*/
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static inline uint64_t ff_framequeue_queued_samples(const FFFrameQueue *fq)
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{
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return fq->total_samples_head - fq->total_samples_tail;
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}
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/**
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* Update the statistics after a frame accessed using ff_framequeue_peek()
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* was modified.
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* Currently used only as a marker.
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*/
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static inline void ff_framequeue_update_peeked(FFFrameQueue *fq, size_t idx)
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{
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}
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/**
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* Update the sample count in the queue.
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*
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* This function must be used when the first frame was accessed using
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* ff_framequeue_peek() and samples were removed from it.
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*/
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static inline void ff_framequeue_skip_samples(FFFrameQueue *fq, size_t n)
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{
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fq->total_samples_tail += n;
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}
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#endif /* AVFILTER_FRAMEQUEUE_H */
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