avfiltergraph.h 3.97 KB
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/*
 * 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
 */

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#ifndef FFMPEG_AVFILTERGRAPH_H
#define FFMPEG_AVFILTERGRAPH_H
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#include "avfilter.h"

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/** Linked-list of filters to create for an AVFilterGraphDesc */
typedef struct AVFilterGraphDescFilter
{
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    int index;              ///< filter instance index
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    char *filter;           ///< name of filter type
    char *args;             ///< filter parameters
    struct AVFilterGraphDescFilter *next;
} AVFilterGraphDescFilter;

/** Linked-list of links between filters */
typedef struct AVFilterGraphDescLink
{
    /* 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

    struct AVFilterGraphDescLink *next;
} AVFilterGraphDescLink;

/** Linked-list of filter pads to be exported from the graph */
typedef struct AVFilterGraphDescExport
{
    /* TODO: allow referencing pads by name, not just by index */
    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

    struct AVFilterGraphDescExport *next;
} AVFilterGraphDescExport;

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/** Sections of a filter graph description */
typedef enum
{
    SEC_NONE = 0,
    SEC_FILTERS,
    SEC_LINKS,
    SEC_INPUTS,
    SEC_OUTPUTS
} AVFilterGraphDescSection;

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/** Description of a graph to be loaded from a file, etc */
typedef struct
{
    AVFilterGraphDescFilter *filters;   ///< filters in the graph
    AVFilterGraphDescLink   *links;     ///< links between the filters
    AVFilterGraphDescExport *inputs;    ///< inputs to export
    AVFilterGraphDescExport *outputs;   ///< outputs to export
} AVFilterGraphDesc;

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typedef struct
{
    AVFilterGraphDescSection section;   ///< current section being parsed

    AVFilterGraphDescFilter **filterp;  ///< last parsed filter
    AVFilterGraphDescLink   **linkp;    ///< last parsed link
    AVFilterGraphDescExport **inputp;   ///< last parsed exported input
    AVFilterGraphDescExport **outputp;  ///< last parsed exported output
} AVFilterGraphDescParser;

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extern AVFilter avfilter_vf_graph;

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/**
 * Parse a graph composed of a simple chain of filters which is described by
 * a single string.
 * @param filters String listing filters and their arguments.
 * @return        The parsed graph description.
 */
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
 */
void avfilter_graph_free_desc(AVFilterGraphDesc *desc);

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/**
 * Add an existing filter instance to a filter graph.
 * @param graph  The filter graph
 * @param filter The filter to be added
 */
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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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 */
int avfilter_graph_config_formats(AVFilterContext *graphctx);

/**
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 * Configure the parameters (resolution, etc) of all links in the graph.
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 */
int avfilter_graph_config_links(AVFilterContext *graphctx);

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#endif  /* FFMPEG_AVFILTERGRAPH_H */