mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
69d45d2ecb
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
/*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef AVFILTER_AVFILTERGRAPH_H
|
|
#define AVFILTER_AVFILTERGRAPH_H
|
|
|
|
#include "avfilter.h"
|
|
#include "libavutil/log.h"
|
|
|
|
typedef struct AVFilterGraph {
|
|
const AVClass *av_class;
|
|
unsigned filter_count;
|
|
AVFilterContext **filters;
|
|
|
|
char *scale_sws_opts; ///< sws options to use for the auto-inserted scale filters
|
|
|
|
char *aresample_swr_opts; ///< swr options to use for the auto-inserted aresample filters, Access ONLY through AVOptions
|
|
|
|
/**
|
|
* Private fields
|
|
*
|
|
* The following fields are for internal use only.
|
|
* Their type, offset, number and semantic can change without notice.
|
|
*/
|
|
|
|
AVFilterLink **sink_links;
|
|
int sink_links_count;
|
|
|
|
unsigned disable_auto_convert;
|
|
} AVFilterGraph;
|
|
|
|
/**
|
|
* Allocate a filter graph.
|
|
*/
|
|
AVFilterGraph *avfilter_graph_alloc(void);
|
|
|
|
/**
|
|
* Get a filter instance with name name from graph.
|
|
*
|
|
* @return the pointer to the found filter instance or NULL if it
|
|
* cannot be found.
|
|
*/
|
|
AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name);
|
|
|
|
/**
|
|
* Add an existing filter instance to a filter graph.
|
|
*
|
|
* @param graphctx the filter graph
|
|
* @param filter the filter to be added
|
|
*/
|
|
int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter);
|
|
|
|
/**
|
|
* Create and add a filter instance into an existing graph.
|
|
* The filter instance is created from the filter filt and inited
|
|
* with the parameters args and opaque.
|
|
*
|
|
* In case of success put in *filt_ctx the pointer to the created
|
|
* filter instance, otherwise set *filt_ctx to NULL.
|
|
*
|
|
* @param name the instance name to give to the created filter instance
|
|
* @param graph_ctx the filter graph
|
|
* @return a negative AVERROR error code in case of failure, a non
|
|
* negative value otherwise
|
|
*/
|
|
int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
|
|
const char *name, const char *args, void *opaque,
|
|
AVFilterGraph *graph_ctx);
|
|
|
|
/**
|
|
* Enable or disable automatic format conversion inside the graph.
|
|
*
|
|
* Note that format conversion can still happen inside explicitly inserted
|
|
* scale and aconvert filters.
|
|
*
|
|
* @param flags any of the AVFILTER_AUTO_CONVERT_* constants
|
|
*/
|
|
void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags);
|
|
|
|
enum {
|
|
AVFILTER_AUTO_CONVERT_ALL = 0, /**< all automatic conversions enabled */
|
|
AVFILTER_AUTO_CONVERT_NONE = -1, /**< all automatic conversions disabled */
|
|
};
|
|
|
|
/**
|
|
* Check validity and configure all the links and formats in the graph.
|
|
*
|
|
* @param graphctx the filter graph
|
|
* @param log_ctx context used for logging
|
|
* @return 0 in case of success, a negative AVERROR code otherwise
|
|
*/
|
|
int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx);
|
|
|
|
/**
|
|
* Free a graph, destroy its links, and set *graph to NULL.
|
|
* If *graph is NULL, do nothing.
|
|
*/
|
|
void avfilter_graph_free(AVFilterGraph **graph);
|
|
|
|
/**
|
|
* A linked-list of the inputs/outputs of the filter chain.
|
|
*
|
|
* This is mainly useful for avfilter_graph_parse() / avfilter_graph_parse2(),
|
|
* where it is used to communicate open (unlinked) inputs and outputs from and
|
|
* to the caller.
|
|
* This struct specifies, per each not connected pad contained in the graph, the
|
|
* filter context and the pad index required for establishing a link.
|
|
*/
|
|
typedef struct AVFilterInOut {
|
|
/** unique name for this input/output in the list */
|
|
char *name;
|
|
|
|
/** filter context associated to this input/output */
|
|
AVFilterContext *filter_ctx;
|
|
|
|
/** index of the filt_ctx pad to use for linking */
|
|
int pad_idx;
|
|
|
|
/** next input/input in the list, NULL if this is the last */
|
|
struct AVFilterInOut *next;
|
|
} AVFilterInOut;
|
|
|
|
/**
|
|
* Allocate a single AVFilterInOut entry.
|
|
* Must be freed with avfilter_inout_free().
|
|
* @return allocated AVFilterInOut on success, NULL on failure.
|
|
*/
|
|
AVFilterInOut *avfilter_inout_alloc(void);
|
|
|
|
/**
|
|
* Free the supplied list of AVFilterInOut and set *inout to NULL.
|
|
* If *inout is NULL, do nothing.
|
|
*/
|
|
void avfilter_inout_free(AVFilterInOut **inout);
|
|
|
|
/**
|
|
* Add a graph described by a string to a graph.
|
|
*
|
|
* @param graph the filter graph where to link the parsed graph context
|
|
* @param filters string to be parsed
|
|
* @param inputs pointer to a linked list to the inputs of the graph, may be NULL.
|
|
* If non-NULL, *inputs is updated to contain the list of open inputs
|
|
* after the parsing, should be freed with avfilter_inout_free().
|
|
* @param outputs pointer to a linked list to the outputs of the graph, may be NULL.
|
|
* If non-NULL, *outputs is updated to contain the list of open outputs
|
|
* after the parsing, should be freed with avfilter_inout_free().
|
|
* @return non negative on success, a negative AVERROR code on error
|
|
*/
|
|
int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
|
|
AVFilterInOut **inputs, AVFilterInOut **outputs,
|
|
void *log_ctx);
|
|
|
|
/**
|
|
* Add a graph described by a string to a graph.
|
|
*
|
|
* @param[in] graph the filter graph where to link the parsed graph context
|
|
* @param[in] filters string to be parsed
|
|
* @param[out] inputs a linked list of all free (unlinked) inputs of the
|
|
* parsed graph will be returned here. It is to be freed
|
|
* by the caller using avfilter_inout_free().
|
|
* @param[out] outputs a linked list of all free (unlinked) outputs of the
|
|
* parsed graph will be returned here. It is to be freed by the
|
|
* caller using avfilter_inout_free().
|
|
* @return zero on success, a negative AVERROR code on error
|
|
*
|
|
* @note the difference between avfilter_graph_parse2() and
|
|
* avfilter_graph_parse() is that in avfilter_graph_parse(), the caller provides
|
|
* the lists of inputs and outputs, which therefore must be known before calling
|
|
* the function. On the other hand, avfilter_graph_parse2() \em returns the
|
|
* inputs and outputs that are left unlinked after parsing the graph and the
|
|
* caller then deals with them. Another difference is that in
|
|
* avfilter_graph_parse(), the inputs parameter describes inputs of the
|
|
* <em>already existing</em> part of the graph; i.e. from the point of view of
|
|
* the newly created part, they are outputs. Similarly the outputs parameter
|
|
* describes outputs of the already existing filters, which are provided as
|
|
* inputs to the parsed filters.
|
|
* avfilter_graph_parse2() takes the opposite approach -- it makes no reference
|
|
* whatsoever to already existing parts of the graph and the inputs parameter
|
|
* will on return contain inputs of the newly parsed part of the graph.
|
|
* Analogously the outputs parameter will contain outputs of the newly created
|
|
* filters.
|
|
*/
|
|
int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters,
|
|
AVFilterInOut **inputs,
|
|
AVFilterInOut **outputs);
|
|
|
|
|
|
/**
|
|
* Send a command to one or more filter instances.
|
|
*
|
|
* @param graph the filter graph
|
|
* @param target the filter(s) to which the command should be sent
|
|
* "all" sends to all filters
|
|
* otherwise it can be a filter or filter instance name
|
|
* which will send the command to all matching filters.
|
|
* @param cmd the command to sent, for handling simplicity all commands must be alphanumeric only
|
|
* @param arg the argument for the command
|
|
* @param res a buffer with size res_size where the filter(s) can return a response.
|
|
*
|
|
* @returns >=0 on success otherwise an error code.
|
|
* AVERROR(ENOSYS) on unsupported commands
|
|
*/
|
|
int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags);
|
|
|
|
/**
|
|
* Queue a command for one or more filter instances.
|
|
*
|
|
* @param graph the filter graph
|
|
* @param target the filter(s) to which the command should be sent
|
|
* "all" sends to all filters
|
|
* otherwise it can be a filter or filter instance name
|
|
* which will send the command to all matching filters.
|
|
* @param cmd the command to sent, for handling simplicity all commands must be alphanummeric only
|
|
* @param arg the argument for the command
|
|
* @param ts time at which the command should be sent to the filter
|
|
*
|
|
* @note As this executes commands after this function returns, no return code
|
|
* from the filter is provided, also AVFILTER_CMD_FLAG_ONE is not supported.
|
|
*/
|
|
int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, int flags, double ts);
|
|
|
|
|
|
/**
|
|
* Dump a graph into a human-readable string representation.
|
|
*
|
|
* @param graph the graph to dump
|
|
* @param options formatting options; currently ignored
|
|
* @return a string, or NULL in case of memory allocation failure;
|
|
* the string must be freed using av_free
|
|
*/
|
|
char *avfilter_graph_dump(AVFilterGraph *graph, const char *options);
|
|
|
|
/**
|
|
* Request a frame on the oldest sink link.
|
|
*
|
|
* If the request returns AVERROR_EOF, try the next.
|
|
*
|
|
* Note that this function is not meant to be the sole scheduling mechanism
|
|
* of a filtergraph, only a convenience function to help drain a filtergraph
|
|
* in a balanced way under normal circumstances.
|
|
*
|
|
* Also note that AVERROR_EOF does not mean that frames did not arrive on
|
|
* some of the sinks during the process.
|
|
* When there are multiple sink links, in case the requested link
|
|
* returns an EOF, this may cause a filter to flush pending frames
|
|
* which are sent to another sink link, although unrequested.
|
|
*
|
|
* @return the return value of ff_request_frame(),
|
|
* or AVERROR_EOF if all links returned AVERROR_EOF
|
|
*/
|
|
int avfilter_graph_request_oldest(AVFilterGraph *graph);
|
|
|
|
#endif /* AVFILTER_AVFILTERGRAPH_H */
|