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/*
* Filters implementation helper functions
*
* 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_FILTERS_H
#define AVFILTER_FILTERS_H
/**
* Filters implementation helper functions
*/
#include "avfilter.h"
/**
* Test and acknowledge the change of status on the link.
*
* Status means EOF or an error condition; a change from the normal (0)
* status to a non-zero status can be queued in a filter's input link, it
* becomes relevant after the frames queued in the link's FIFO are
* processed. This function tests if frames are still queued and if a queued
* status change has not yet been processed. In that case it performs basic
* treatment (updating the link's timestamp) and returns a positive value to
* let the filter do its own treatments (flushing...).
*
* Filters implementing the activate callback should call this function when
* they think it might succeed (usually after checking unsuccessfully for a
* queued frame).
* Filters implementing the filter_frame and request_frame callbacks do not
* need to call that since the same treatment happens in ff_filter_frame().
*
* @param[out] rstatus new or current status
* @param[out] rpts current timestamp of the link in link time base
* @return >0 if status changed, <0 if status already acked, 0 otherwise
*/
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts);
#endif /* AVFILTER_FILTERS_H */
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