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