185 lines
6.7 KiB
C
185 lines
6.7 KiB
C
/*
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* Filter graphs
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* copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_AVFILTERGRAPH_H
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#define AVFILTER_AVFILTERGRAPH_H
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#include "avfilter.h"
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typedef struct AVFilterGraph {
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unsigned filter_count;
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AVFilterContext **filters;
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char *scale_sws_opts; ///< sws options to use for the auto-inserted scale filters
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} AVFilterGraph;
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/**
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* Allocate a filter graph.
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*/
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AVFilterGraph *avfilter_graph_alloc(void);
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/**
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* Get a filter instance with name name from graph.
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*
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* @return the pointer to the found filter instance or NULL if it
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* cannot be found.
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*/
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AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name);
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/**
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* Add an existing filter instance to a filter graph.
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*
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* @param graphctx the filter graph
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* @param filter the filter to be added
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*/
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int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter);
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/**
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* Create and add a filter instance into an existing graph.
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* The filter instance is created from the filter filt and inited
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* with the parameters args and opaque.
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*
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* In case of success put in *filt_ctx the pointer to the created
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* filter instance, otherwise set *filt_ctx to NULL.
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*
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* @param name the instance name to give to the created filter instance
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* @param graph_ctx the filter graph
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* @return a negative AVERROR error code in case of failure, a non
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* negative value otherwise
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*/
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int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
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const char *name, const char *args, void *opaque,
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AVFilterGraph *graph_ctx);
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/**
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* Check validity and configure all the links and formats in the graph.
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*
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* @param graphctx the filter graph
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* @param log_ctx context used for logging
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* @return 0 in case of success, a negative AVERROR code otherwise
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*/
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int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx);
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/**
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* Free a graph, destroy its links, and set *graph to NULL.
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* If *graph is NULL, do nothing.
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*/
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void avfilter_graph_free(AVFilterGraph **graph);
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/**
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* A linked-list of the inputs/outputs of the filter chain.
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*
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* This is mainly useful for avfilter_graph_parse(), since this
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* function may accept a description of a graph with not connected
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* input/output pads. This struct specifies, per each not connected
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* pad contained in the graph, the filter context and the pad index
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* required for establishing a link.
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*/
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typedef struct AVFilterInOut {
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/** unique name for this input/output in the list */
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char *name;
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/** filter context associated to this input/output */
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AVFilterContext *filter_ctx;
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/** index of the filt_ctx pad to use for linking */
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int pad_idx;
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/** next input/input in the list, NULL if this is the last */
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struct AVFilterInOut *next;
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} AVFilterInOut;
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/**
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* Create an AVFilterInOut.
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* Must be free with avfilter_inout_free().
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*/
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AVFilterInOut *avfilter_inout_alloc(void);
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/**
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* Free the AVFilterInOut in *inout, and set its pointer to NULL.
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* If *inout is NULL, do nothing.
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*/
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void avfilter_inout_free(AVFilterInOut **inout);
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/**
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* Add a graph described by a string to a graph.
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*
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* @param graph the filter graph where to link the parsed graph context
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* @param filters string to be parsed
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* @param inputs pointer to a linked list to the inputs of the graph, may be NULL.
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* If non-NULL, *inputs is updated to contain the list of open inputs
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* after the parsing, should be freed with avfilter_inout_free().
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* @param outputs pointer to a linked list to the outputs of the graph, may be NULL.
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* If non-NULL, *outputs is updated to contain the list of open outputs
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* after the parsing, should be freed with avfilter_inout_free().
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* @return non negative on success, a negative AVERROR code on error
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*/
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int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
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AVFilterInOut **inputs, AVFilterInOut **outputs,
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void *log_ctx);
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/**
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* Send a command to one or more filter instances.
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*
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* @param graph the filter graph
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* @param target the filter(s) to which the command should be sent
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* "all" sends to all filters
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* otherwise it can be a filter or filter instance name
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* which will send the command to all matching filters.
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* @param cmd the command to sent, for handling simplicity all commands must be alphanumeric only
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* @param arg the argument for the command
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* @param res a buffer with size res_size where the filter(s) can return a response.
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*
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* @returns >=0 on success otherwise an error code.
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* AVERROR(ENOSYS) on unsupported commands
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*/
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int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags);
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/**
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* Queue a command for one or more filter instances.
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*
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* @param graph the filter graph
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* @param target the filter(s) to which the command should be sent
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* "all" sends to all filters
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* otherwise it can be a filter or filter instance name
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* which will send the command to all matching filters.
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* @param cmd the command to sent, for handling simplicity all commands must be alphanummeric only
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* @param arg the argument for the command
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* @param ts time at which the command should be sent to the filter
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*
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* @note As this executes commands after this function returns, no return code
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* from the filter is provided, also AVFILTER_CMD_FLAG_ONE is not supported.
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*/
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int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, int flags, double ts);
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/**
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* Dump a graph into a human-readable string representation.
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*
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* @param graph the graph to dump
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* @param options formatting options; currently ignored
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* @return a string, or NULL in case of memory allocation failure;
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* the string must be freed using av_free
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*/
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char *avfilter_graph_dump(AVFilterGraph *graph, const char *options);
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#endif /* AVFILTER_AVFILTERGRAPH_H */
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