avfiltergraph.h 2.57 KB
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/*
 * Filter graphs
 * copyright (c) 2007 Bobby Bingham
 *
 * 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
 */

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#ifndef AVFILTER_AVFILTERGRAPH_H
#define AVFILTER_AVFILTERGRAPH_H
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#include "avfilter.h"

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typedef struct AVFilterGraph {
    unsigned filter_count;
    AVFilterContext **filters;
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    char *scale_sws_opts; ///< sws options to use for the auto-inserted scale filters
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} AVFilterGraph;
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/**
 * Allocate a filter graph.
 */
AVFilterGraph *avfilter_graph_alloc(void);

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/**
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 * Get a filter instance with name name from graph.
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 *
 * @return the pointer to the found filter instance or NULL if it
 * cannot be found.
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 */
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AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name);
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/**
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 * Add an existing filter instance to a filter graph.
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 *
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 * @param graphctx  the filter graph
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 * @param filter the filter to be added
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 */
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int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter);
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/**
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 * Check for the validity of graph.
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 *
 * A graph is considered valid if all its input and output pads are
 * connected.
 *
 * @return 0 in case of success, a negative value otherwise
 */
int avfilter_graph_check_validity(AVFilterGraph *graphctx, AVClass *log_ctx);

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/**
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 * Configure all the links of graphctx.
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 *
 * @return 0 in case of success, a negative value otherwise
 */
int avfilter_graph_config_links(AVFilterGraph *graphctx, AVClass *log_ctx);

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/**
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 * Configure the formats of all the links in the graph.
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 */
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int avfilter_graph_config_formats(AVFilterGraph *graphctx, AVClass *log_ctx);
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/**
 * Check validity and configure all the links and formats in the graph.
 *
 * @see avfilter_graph_check_validity(), avfilter_graph_config_links(),
 * avfilter_graph_config_formats()
 */
int avfilter_graph_config(AVFilterGraph *graphctx, AVClass *log_ctx);

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/**
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 * Free a graph and destroy its links.
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 */
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void avfilter_graph_free(AVFilterGraph *graph);
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#endif  /* AVFILTER_AVFILTERGRAPH_H */