framequeue.h

/*
 * 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

#include "libavutil/frame.h"

typedef struct FFFrameBucket {
    AVFrame *frame;
} FFFrameBucket;

typedef struct FFFrameQueueGlobal {
    char dummy; /* C does not allow empty structs */
} FFFrameQueueGlobal;

typedef struct FFFrameQueue {

    FFFrameBucket *queue;

    size_t allocated;

    size_t tail;

    size_t queued;

    FFFrameBucket first_bucket;

    uint64_t total_frames_head;

    uint64_t total_frames_tail;

    uint64_t total_samples_head;

    uint64_t total_samples_tail;

    int samples_skipped;

} FFFrameQueue;

void ff_framequeue_global_init(FFFrameQueueGlobal *fqg);

void ff_framequeue_init(FFFrameQueue *fq, FFFrameQueueGlobal *fqg);

void ff_framequeue_free(FFFrameQueue *fq);

int ff_framequeue_add(FFFrameQueue *fq, AVFrame *frame);

AVFrame *ff_framequeue_take(FFFrameQueue *fq);

AVFrame *ff_framequeue_peek(FFFrameQueue *fq, size_t idx);

static inline size_t ff_framequeue_queued_frames(const FFFrameQueue *fq)
{
    return fq->queued;
}

static inline uint64_t ff_framequeue_queued_samples(const FFFrameQueue *fq)
{
    return fq->total_samples_head - fq->total_samples_tail;
}

static inline void ff_framequeue_update_peeked(FFFrameQueue *fq, size_t idx)
{
}

void ff_framequeue_skip_samples(FFFrameQueue *fq, size_t samples, AVRational time_base);

#endif /* AVFILTER_FRAMEQUEUE_H */