1/*
2 * Filter graphs
3 * copyright (c) 2007 Bobby Bingham
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#ifndef AVFILTER_AVFILTERGRAPH_H
23#define AVFILTER_AVFILTERGRAPH_H
24
25#include "avfilter.h"
26
27typedef struct AVFilterGraph {
28    unsigned filter_count;
29    AVFilterContext **filters;
30
31    char *scale_sws_opts; ///< sws options to use for the auto-inserted scale filters
32} AVFilterGraph;
33
34/**
35 * Gets a filter instance with name name from graph.
36 *
37 * @return the pointer to the found filter instance or NULL if it
38 * cannot be found.
39 */
40AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name);
41
42/**
43 * Adds an existing filter instance to a filter graph.
44 *
45 * @param graph  the filter graph
46 * @param filter the filter to be added
47 */
48int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter);
49
50/**
51 * Checks for the validity of graph.
52 *
53 * A graph is considered valid if all its input and output pads are
54 * connected.
55 *
56 * @return 0 in case of success, a negative value otherwise
57 */
58int avfilter_graph_check_validity(AVFilterGraph *graphctx, AVClass *log_ctx);
59
60/**
61 * Configures all the links of graphctx.
62 *
63 * @return 0 in case of success, a negative value otherwise
64 */
65int avfilter_graph_config_links(AVFilterGraph *graphctx, AVClass *log_ctx);
66
67/**
68 * Configures the formats of all the links in the graph.
69 */
70int avfilter_graph_config_formats(AVFilterGraph *graphctx, AVClass *log_ctx);
71
72/**
73 * Frees a graph and destroys its links.
74 */
75void avfilter_graph_destroy(AVFilterGraph *graph);
76
77#endif  /* AVFILTER_AVFILTERGRAPH_H */
78