/* * 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; /** * Allocate a filter graph. */ AVFilterGraph *avfilter_graph_alloc(void); /** * Get 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); /** * Add an existing filter instance to a filter graph. * * @param graphctx the filter graph * @param filter the filter to be added */ int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter); /** * Create and add a filter instance into an existing graph. * The filter instance is created from the filter filt and inited * with the parameters args and opaque. * * In case of success put in *filt_ctx the pointer to the created * filter instance, otherwise set *filt_ctx to NULL. * * @param name the instance name to give to the created filter instance * @param graph_ctx the filter graph * @return a negative AVERROR error code in case of failure, a non * negative value otherwise */ int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt, const char *name, const char *args, void *opaque, AVFilterGraph *graph_ctx); /** * Check validity and configure all the links and formats in the graph. * * @param graphctx the filter graph * @param log_ctx context used for logging * @return 0 in case of success, a negative AVERROR code otherwise */ int avfilter_graph_config(AVFilterGraph *graphctx, AVClass *log_ctx); /** * Free a graph and destroy its links, graph may be NULL. */ void avfilter_graph_free(AVFilterGraph *graph); /** * A linked-list of the inputs/outputs of the filter chain. * * This is mainly useful for avfilter_graph_parse(), since this * function may accept a description of a graph with not connected * input/output pads. This struct specifies, per each not connected * pad contained in the graph, the filter context and the pad index * required for establishing a link. */ typedef struct AVFilterInOut { /** unique name for this input/output in the list */ char *name; /** filter context associated to this input/output */ AVFilterContext *filter_ctx; /** index of the filt_ctx pad to use for linking */ int pad_idx; /** next input/input in the list, NULL if this is the last */ struct AVFilterInOut *next; } AVFilterInOut; /** * Add a graph described by a string to a graph. * * @param graph the filter graph where to link the parsed graph context * @param filters string to be parsed * @param inputs linked list to the inputs of the graph * @param outputs linked list to the outputs of the graph * @return zero on success, a negative AVERROR code on error */ int avfilter_graph_parse(AVFilterGraph *graph, const char *filters, AVFilterInOut *inputs, AVFilterInOut *outputs, AVClass *log_ctx); #endif /* AVFILTER_AVFILTERGRAPH_H */