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ffmpeg / libavfilter / avfiltergraph.h @ 45a09319

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/*
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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 FFMPEG_AVFILTERGRAPH_H
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#define FFMPEG_AVFILTERGRAPH_H
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#include "avfilter.h"
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/** Linked-list of filters to create for an AVFilterGraphDesc */
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typedef struct AVFilterGraphDescFilter
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{
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    int index;              ///< filter instance index
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    char *filter;           ///< name of filter type
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    char *args;             ///< filter parameters
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    struct AVFilterGraphDescFilter *next;
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} AVFilterGraphDescFilter;
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/** Linked-list of links between filters */
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typedef struct AVFilterGraphDescLink
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{
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    /* TODO: allow referencing pads by name, not just by index */
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    int src;                ///< index of the source filter
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    unsigned srcpad;        ///< index of the output pad on the source filter
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    int dst;                ///< index of the dest filter
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    unsigned dstpad;        ///< index of the input pad on the dest filter
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    struct AVFilterGraphDescLink *next;
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} AVFilterGraphDescLink;
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/** Linked-list of filter pads to be exported from the graph */
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typedef struct AVFilterGraphDescExport
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{
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    /* TODO: allow referencing pads by name, not just by index */
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    char *name;             ///< name of the exported pad
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    int filter;             ///< index of the filter
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    unsigned pad;           ///< index of the pad to be exported
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    struct AVFilterGraphDescExport *next;
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} AVFilterGraphDescExport;
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/** Sections of a filter graph description */
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typedef enum
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{
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    SEC_NONE = 0,
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    SEC_FILTERS,
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    SEC_LINKS,
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    SEC_INPUTS,
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    SEC_OUTPUTS
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} AVFilterGraphDescSection;
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/** Description of a graph to be loaded from a file, etc */
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typedef struct
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{
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    AVFilterGraphDescFilter *filters;   ///< filters in the graph
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    AVFilterGraphDescLink   *links;     ///< links between the filters
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    AVFilterGraphDescExport *inputs;    ///< inputs to export
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    AVFilterGraphDescExport *outputs;   ///< outputs to export
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} AVFilterGraphDesc;
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typedef struct
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{
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    AVFilterGraphDescSection section;   ///< current section being parsed
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    AVFilterGraphDescFilter **filterp;  ///< last parsed filter
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    AVFilterGraphDescLink   **linkp;    ///< last parsed link
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    AVFilterGraphDescExport **inputp;   ///< last parsed exported input
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    AVFilterGraphDescExport **outputp;  ///< last parsed exported output
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} AVFilterGraphDescParser;
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extern AVFilter avfilter_vf_graph;
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/**
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 * Parse a graph composed of a simple chain of filters which is described by
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 * a single string.
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 * @param filters String listing filters and their arguments.
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 * @return        The parsed graph description.
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 */
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AVFilterGraphDesc *avfilter_graph_parse_chain(const char *filters);
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/**
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 * Free a filter graph description.
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 * @param desc The graph description to free
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 */
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void avfilter_graph_free_desc(AVFilterGraphDesc *desc);
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/**
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 * Add an existing filter instance to a filter graph.
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 * @param graph  The filter graph
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 * @param filter The filter to be added
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 */
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void avfilter_graph_add_filter(AVFilterContext *graphctx, AVFilterContext *filter);
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/**
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 * Configure the formats of all the links in the graph.
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 */
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int avfilter_graph_config_formats(AVFilterContext *graphctx);
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/**
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 * Configure the parameters (resolution, etc) of all links in the graph.
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 */
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int avfilter_graph_config_links(AVFilterContext *graphctx);
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int graph_load_from_desc3(AVFilterContext *ctx, AVFilterGraphDesc *desc,
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                          AVFilterContext *in, int inpad,
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                          AVFilterContext *out, int outpad);
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#endif  /* FFMPEG_AVFILTERGRAPH_H */