/* * 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 */ #ifndef AVFILTER_AVFILTERGRAPH_H#define AVFILTER_AVFILTERGRAPH_H #include "avfilter.h" typedef struct AVFilterGraph {    unsigned filter_count;    AVFilterContext **filters;     char *scale_sws_opts; ///< sws options to use for the auto-inserted scale filters} AVFilterGraph; /** * Gets a filter instance with name name from graph. * * @return the pointer to the found filter instance or NULL if it * cannot be found. */AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name); /** * Adds an existing filter instance to a filter graph. * * @param graph  the filter graph * @param filter the filter to be added */int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter); /** * Checks for the validity of graph. * * 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); /** * Configures all the links of graphctx. * * @return 0 in case of success, a negative value otherwise */int avfilter_graph_config_links(AVFilterGraph *graphctx, AVClass *log_ctx); /** * Configures the formats of all the links in the graph. */int avfilter_graph_config_formats(AVFilterGraph *graphctx, AVClass *log_ctx); /** * Frees a graph and destroys its links. */void avfilter_graph_destroy(AVFilterGraph *graph); #endif  /* AVFILTER_AVFILTERGRAPH_H */