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![Michael Niedermayer](/assets/img/avatar_default.png)
Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
272 lines
10 KiB
C
272 lines
10 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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#include "libavutil/log.h"
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typedef struct AVFilterGraph {
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const AVClass *av_class;
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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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char *aresample_swr_opts; ///< swr options to use for the auto-inserted aresample filters, Access ONLY through AVOptions
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/**
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* Private fields
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*
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* The following fields are for internal use only.
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* Their type, offset, number and semantic can change without notice.
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*/
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AVFilterLink **sink_links;
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int sink_links_count;
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unsigned disable_auto_convert;
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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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* Enable or disable automatic format conversion inside the graph.
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*
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* Note that format conversion can still happen inside explicitly inserted
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* scale and aconvert filters.
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*
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* @param flags any of the AVFILTER_AUTO_CONVERT_* constants
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*/
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void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags);
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enum {
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AVFILTER_AUTO_CONVERT_ALL = 0, /**< all automatic conversions enabled */
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AVFILTER_AUTO_CONVERT_NONE = -1, /**< all automatic conversions disabled */
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};
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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() / avfilter_graph_parse2(),
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* where it is used to communicate open (unlinked) inputs and outputs from and
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* to the caller.
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* This struct specifies, per each not connected pad contained in the graph, the
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* filter context and the pad index 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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* Allocate a single AVFilterInOut entry.
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* Must be freed with avfilter_inout_free().
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* @return allocated AVFilterInOut on success, NULL on failure.
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*/
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AVFilterInOut *avfilter_inout_alloc(void);
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/**
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* Free the supplied list of AVFilterInOut and set *inout 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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* Add a graph described by a string to a graph.
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*
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* @param[in] graph the filter graph where to link the parsed graph context
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* @param[in] filters string to be parsed
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* @param[out] inputs a linked list of all free (unlinked) inputs of the
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* parsed graph will be returned here. It is to be freed
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* by the caller using avfilter_inout_free().
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* @param[out] outputs a linked list of all free (unlinked) outputs of the
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* parsed graph will be returned here. It is to be freed by the
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* caller using avfilter_inout_free().
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* @return zero on success, a negative AVERROR code on error
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*
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* @note the difference between avfilter_graph_parse2() and
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* avfilter_graph_parse() is that in avfilter_graph_parse(), the caller provides
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* the lists of inputs and outputs, which therefore must be known before calling
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* the function. On the other hand, avfilter_graph_parse2() \em returns the
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* inputs and outputs that are left unlinked after parsing the graph and the
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* caller then deals with them. Another difference is that in
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* avfilter_graph_parse(), the inputs parameter describes inputs of the
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* <em>already existing</em> part of the graph; i.e. from the point of view of
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* the newly created part, they are outputs. Similarly the outputs parameter
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* describes outputs of the already existing filters, which are provided as
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* inputs to the parsed filters.
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* avfilter_graph_parse2() takes the opposite approach -- it makes no reference
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* whatsoever to already existing parts of the graph and the inputs parameter
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* will on return contain inputs of the newly parsed part of the graph.
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* Analogously the outputs parameter will contain outputs of the newly created
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* filters.
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*/
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int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters,
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AVFilterInOut **inputs,
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AVFilterInOut **outputs);
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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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/**
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* Request a frame on the oldest sink link.
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*
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* If the request returns AVERROR_EOF, try the next.
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*
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* Note that this function is not meant to be the sole scheduling mechanism
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* of a filtergraph, only a convenience function to help drain a filtergraph
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* in a balanced way under normal circumstances.
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*
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* Also note that AVERROR_EOF does not mean that frames did not arrive on
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* some of the sinks during the process.
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* When there are multiple sink links, in case the requested link
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* returns an EOF, this may cause a filter to flush pending frames
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* which are sent to another sink link, although unrequested.
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*
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* @return the return value of ff_request_frame(),
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* or AVERROR_EOF if all links returned AVERROR_EOF
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*/
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int avfilter_graph_request_oldest(AVFilterGraph *graph);
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#endif /* AVFILTER_AVFILTERGRAPH_H */
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