/*
 * Internal filter link API
 *
 * 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_LINK_INTERNAL_H
#define AVFILTER_LINK_INTERNAL_H

#include <stdint.h>

#include "avfilter.h"
#include "framequeue.h"

typedef struct FilterLinkInternal {
    AVFilterLink l;

    /**
     * Queue of frames waiting to be filtered.
     */
    FFFrameQueue fifo;

    /**
     * If set, the source filter can not generate a frame as is.
     * The goal is to avoid repeatedly calling the request_frame() method on
     * the same link.
     */
    int frame_blocked_in;

    /**
     * Link input status.
     * If not zero, all attempts of filter_frame will fail with the
     * corresponding code.
     */
    int status_in;

    /**
     * Timestamp of the input status change.
     */
    int64_t status_in_pts;

    /**
     * Link output status.
     * If not zero, all attempts of request_frame will fail with the
     * corresponding code.
     */
    int status_out;
} FilterLinkInternal;

static inline FilterLinkInternal *ff_link_internal(AVFilterLink *link)
{
    return (FilterLinkInternal*)link;
}

#endif /* AVFILTER_LINK_INTERNAL_H */