mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-15 19:55:08 +00:00
175 lines
4.2 KiB
C
175 lines
4.2 KiB
C
/*
|
|
* Generic frame queue
|
|
* Copyright (c) 2016 Nicolas George
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public License
|
|
* as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVFILTER_FRAMEQUEUE_H
|
|
#define AVFILTER_FRAMEQUEUE_H
|
|
|
|
/**
|
|
* FFFrameQueue: simple AVFrame queue API
|
|
*
|
|
* Note: this API is not thread-safe. Concurrent access to the same queue
|
|
* must be protected by a mutex or any synchronization mechanism.
|
|
*/
|
|
|
|
#include "libavutil/frame.h"
|
|
|
|
typedef struct FFFrameBucket {
|
|
AVFrame *frame;
|
|
} FFFrameBucket;
|
|
|
|
/**
|
|
* Structure to hold global options and statistics for frame queues.
|
|
*
|
|
* This structure is intended to allow implementing global control of the
|
|
* frame queues, including memory consumption caps.
|
|
*
|
|
* It is currently empty.
|
|
*/
|
|
typedef struct FFFrameQueueGlobal {
|
|
char dummy; /* C does not allow empty structs */
|
|
} FFFrameQueueGlobal;
|
|
|
|
/**
|
|
* Queue of AVFrame pointers.
|
|
*/
|
|
typedef struct FFFrameQueue {
|
|
|
|
/**
|
|
* Array of allocated buckets, used as a circular buffer.
|
|
*/
|
|
FFFrameBucket *queue;
|
|
|
|
/**
|
|
* Size of the array of buckets.
|
|
*/
|
|
size_t allocated;
|
|
|
|
/**
|
|
* Tail of the queue.
|
|
* It is the index in the array of the next frame to take.
|
|
*/
|
|
size_t tail;
|
|
|
|
/**
|
|
* Number of currently queued frames.
|
|
*/
|
|
size_t queued;
|
|
|
|
/**
|
|
* Pre-allocated bucket for queues of size 1.
|
|
*/
|
|
FFFrameBucket first_bucket;
|
|
|
|
/**
|
|
* Total number of frames entered in the queue.
|
|
*/
|
|
uint64_t total_frames_head;
|
|
|
|
/**
|
|
* Total number of frames dequeued from the queue.
|
|
* queued = total_frames_head - total_frames_tail
|
|
*/
|
|
uint64_t total_frames_tail;
|
|
|
|
/**
|
|
* Total number of samples entered in the queue.
|
|
*/
|
|
uint64_t total_samples_head;
|
|
|
|
/**
|
|
* Total number of samples dequeued from the queue.
|
|
* queued_samples = total_samples_head - total_samples_tail
|
|
*/
|
|
uint64_t total_samples_tail;
|
|
|
|
} FFFrameQueue;
|
|
|
|
/**
|
|
* Init a global structure.
|
|
*/
|
|
void ff_framequeue_global_init(FFFrameQueueGlobal *fqg);
|
|
|
|
/**
|
|
* Init a frame queue and attach it to a global structure.
|
|
*/
|
|
void ff_framequeue_init(FFFrameQueue *fq, FFFrameQueueGlobal *fqg);
|
|
|
|
/**
|
|
* Free the queue and all queued frames.
|
|
*/
|
|
void ff_framequeue_free(FFFrameQueue *fq);
|
|
|
|
/**
|
|
* Add a frame.
|
|
* @return >=0 or an AVERROR code.
|
|
*/
|
|
int ff_framequeue_add(FFFrameQueue *fq, AVFrame *frame);
|
|
|
|
/**
|
|
* Take the first frame in the queue.
|
|
* Must not be used with empty queues.
|
|
*/
|
|
AVFrame *ff_framequeue_take(FFFrameQueue *fq);
|
|
|
|
/**
|
|
* Access a frame in the queue, without removing it.
|
|
* The first frame is numbered 0; the designated frame must exist.
|
|
*/
|
|
AVFrame *ff_framequeue_peek(FFFrameQueue *fq, size_t idx);
|
|
|
|
/**
|
|
* Get the number of queued frames.
|
|
*/
|
|
static inline size_t ff_framequeue_queued_frames(const FFFrameQueue *fq)
|
|
{
|
|
return fq->queued;
|
|
}
|
|
|
|
/**
|
|
* Get the number of queued samples.
|
|
*/
|
|
static inline uint64_t ff_framequeue_queued_samples(const FFFrameQueue *fq)
|
|
{
|
|
return fq->total_samples_head - fq->total_samples_tail;
|
|
}
|
|
|
|
/**
|
|
* Update the statistics after a frame accessed using ff_framequeue_peek()
|
|
* was modified.
|
|
* Currently used only as a marker.
|
|
*/
|
|
static inline void ff_framequeue_update_peeked(FFFrameQueue *fq, size_t idx)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Update the sample count in the queue.
|
|
*
|
|
* This function must be used when the first frame was accessed using
|
|
* ff_framequeue_peek() and samples were removed from it.
|
|
*/
|
|
static inline void ff_framequeue_skip_samples(FFFrameQueue *fq, size_t n)
|
|
{
|
|
fq->total_samples_tail += n;
|
|
}
|
|
|
|
#endif /* AVFILTER_FRAMEQUEUE_H */
|