3 * copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
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.
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.
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
22 #ifndef AVFILTER_AVFILTERGRAPH_H
23 #define AVFILTER_AVFILTERGRAPH_H
26 #include "libavutil/log.h"
28 typedef struct AVFilterGraph {
29 #if FF_API_GRAPH_AVCLASS
30 const AVClass *av_class;
32 unsigned filter_count;
33 AVFilterContext **filters;
35 char *scale_sws_opts; ///< sws options to use for the auto-inserted scale filters
39 * Allocate a filter graph.
41 AVFilterGraph *avfilter_graph_alloc(void);
44 * Get a filter instance with name name from graph.
46 * @return the pointer to the found filter instance or NULL if it
49 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name);
52 * Add an existing filter instance to a filter graph.
54 * @param graphctx the filter graph
55 * @param filter the filter to be added
57 int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter);
60 * Create and add a filter instance into an existing graph.
61 * The filter instance is created from the filter filt and inited
62 * with the parameters args and opaque.
64 * In case of success put in *filt_ctx the pointer to the created
65 * filter instance, otherwise set *filt_ctx to NULL.
67 * @param name the instance name to give to the created filter instance
68 * @param graph_ctx the filter graph
69 * @return a negative AVERROR error code in case of failure, a non
70 * negative value otherwise
72 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
73 const char *name, const char *args, void *opaque,
74 AVFilterGraph *graph_ctx);
77 * Check validity and configure all the links and formats in the graph.
79 * @param graphctx the filter graph
80 * @param log_ctx context used for logging
81 * @return 0 in case of success, a negative AVERROR code otherwise
83 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx);
86 * Free a graph, destroy its links, and set *graph to NULL.
87 * If *graph is NULL, do nothing.
89 void avfilter_graph_free(AVFilterGraph **graph);
92 * A linked-list of the inputs/outputs of the filter chain.
94 * This is mainly useful for avfilter_graph_parse(), since this
95 * function may accept a description of a graph with not connected
96 * input/output pads. This struct specifies, per each not connected
97 * pad contained in the graph, the filter context and the pad index
98 * required for establishing a link.
100 typedef struct AVFilterInOut {
101 /** unique name for this input/output in the list */
104 /** filter context associated to this input/output */
105 AVFilterContext *filter_ctx;
107 /** index of the filt_ctx pad to use for linking */
110 /** next input/input in the list, NULL if this is the last */
111 struct AVFilterInOut *next;
115 * Create an AVFilterInOut.
116 * Must be free with avfilter_inout_free().
118 AVFilterInOut *avfilter_inout_alloc(void);
121 * Free the AVFilterInOut in *inout, and set its pointer to NULL.
122 * If *inout is NULL, do nothing.
124 void avfilter_inout_free(AVFilterInOut **inout);
127 * Add a graph described by a string to a graph.
129 * @param graph the filter graph where to link the parsed graph context
130 * @param filters string to be parsed
131 * @param inputs pointer to a linked list to the inputs of the graph, may be NULL.
132 * If non-NULL, *inputs is updated to contain the list of open inputs
133 * after the parsing, should be freed with avfilter_inout_free().
134 * @param outputs pointer to a linked list to the outputs of the graph, may be NULL.
135 * If non-NULL, *outputs is updated to contain the list of open outputs
136 * after the parsing, should be freed with avfilter_inout_free().
137 * @return non negative on success, a negative AVERROR code on error
139 int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
140 AVFilterInOut **inputs, AVFilterInOut **outputs,
144 * Send a command to one or more filter instances.
146 * @param graph the filter graph
147 * @param target the filter(s) to which the command should be sent
148 * "all" sends to all filters
149 * otherwise it can be a filter or filter instance name
150 * which will send the command to all matching filters.
151 * @param cmd the command to sent, for handling simplicity all commands must be alphanumeric only
152 * @param arg the argument for the command
153 * @param res a buffer with size res_size where the filter(s) can return a response.
155 * @returns >=0 on success otherwise an error code.
156 * AVERROR(ENOSYS) on unsupported commands
158 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags);
161 * Queue a command for one or more filter instances.
163 * @param graph the filter graph
164 * @param target the filter(s) to which the command should be sent
165 * "all" sends to all filters
166 * otherwise it can be a filter or filter instance name
167 * which will send the command to all matching filters.
168 * @param cmd the command to sent, for handling simplicity all commands must be alphanummeric only
169 * @param arg the argument for the command
170 * @param ts time at which the command should be sent to the filter
172 * @note As this executes commands after this function returns, no return code
173 * from the filter is provided, also AVFILTER_CMD_FLAG_ONE is not supported.
175 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, int flags, double ts);
179 * Dump a graph into a human-readable string representation.
181 * @param graph the graph to dump
182 * @param options formatting options; currently ignored
183 * @return a string, or NULL in case of memory allocation failure;
184 * the string must be freed using av_free
186 char *avfilter_graph_dump(AVFilterGraph *graph, const char *options);
188 #endif /* AVFILTER_AVFILTERGRAPH_H */