| /* |
| * 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, void *log_ctx); |
| |
| /** |
| * Free a graph, destroy its links, and set *graph to NULL. |
| * If *graph is NULL, do nothing. |
| */ |
| 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; |
| |
| /** |
| * Create an AVFilterInOut. |
| * Must be free with avfilter_inout_free(). |
| */ |
| AVFilterInOut *avfilter_inout_alloc(void); |
| |
| /** |
| * Free the AVFilterInOut in *inout, and set its pointer to NULL. |
| * If *inout is NULL, do nothing. |
| */ |
| void avfilter_inout_free(AVFilterInOut **inout); |
| |
| /** |
| * 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 pointer to a linked list to the inputs of the graph, may be NULL. |
| * If non-NULL, *inputs is updated to contain the list of open inputs |
| * after the parsing, should be freed with avfilter_inout_free(). |
| * @param outputs pointer to a linked list to the outputs of the graph, may be NULL. |
| * If non-NULL, *outputs is updated to contain the list of open outputs |
| * after the parsing, should be freed with avfilter_inout_free(). |
| * @return zero on success, a negative AVERROR code on error |
| */ |
| int avfilter_graph_parse(AVFilterGraph *graph, const char *filters, |
| AVFilterInOut **inputs, AVFilterInOut **outputs, |
| void *log_ctx); |
| |
| #endif /* AVFILTER_AVFILTERGRAPH_H */ |