+++ /dev/null
-/*
- * filter layer
- * 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_AVFILTER_H
-#define AVFILTER_AVFILTER_H
-
-/**
- * @file
- * @ingroup lavfi
- * Main libavfilter public API header
- */
-
-/**
- * @defgroup lavfi Libavfilter - graph-based frame editing library
- * @{
- */
-
-#include <stddef.h>
-
-#include "libavutil/attributes.h"
-#include "libavutil/avutil.h"
-#include "libavutil/dict.h"
-#include "libavutil/frame.h"
-#include "libavutil/log.h"
-#include "libavutil/samplefmt.h"
-#include "libavutil/pixfmt.h"
-#include "libavutil/rational.h"
-
-#include "libavfilter/version.h"
-
-/**
- * Return the LIBAVFILTER_VERSION_INT constant.
- */
-unsigned avfilter_version(void);
-
-/**
- * Return the libavfilter build-time configuration.
- */
-const char *avfilter_configuration(void);
-
-/**
- * Return the libavfilter license.
- */
-const char *avfilter_license(void);
-
-typedef struct AVFilterContext AVFilterContext;
-typedef struct AVFilterLink AVFilterLink;
-typedef struct AVFilterPad AVFilterPad;
-typedef struct AVFilterFormats AVFilterFormats;
-
-/**
- * Get the number of elements in a NULL-terminated array of AVFilterPads (e.g.
- * AVFilter.inputs/outputs).
- */
-int avfilter_pad_count(const AVFilterPad *pads);
-
-/**
- * Get the name of an AVFilterPad.
- *
- * @param pads an array of AVFilterPads
- * @param pad_idx index of the pad in the array it; is the caller's
- * responsibility to ensure the index is valid
- *
- * @return name of the pad_idx'th pad in pads
- */
-const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx);
-
-/**
- * Get the type of an AVFilterPad.
- *
- * @param pads an array of AVFilterPads
- * @param pad_idx index of the pad in the array; it is the caller's
- * responsibility to ensure the index is valid
- *
- * @return type of the pad_idx'th pad in pads
- */
-enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx);
-
-/**
- * The number of the filter inputs is not determined just by AVFilter.inputs.
- * The filter might add additional inputs during initialization depending on the
- * options supplied to it.
- */
-#define AVFILTER_FLAG_DYNAMIC_INPUTS (1 << 0)
-/**
- * The number of the filter outputs is not determined just by AVFilter.outputs.
- * The filter might add additional outputs during initialization depending on
- * the options supplied to it.
- */
-#define AVFILTER_FLAG_DYNAMIC_OUTPUTS (1 << 1)
-/**
- * The filter supports multithreading by splitting frames into multiple parts
- * and processing them concurrently.
- */
-#define AVFILTER_FLAG_SLICE_THREADS (1 << 2)
-/**
- * Some filters support a generic "enable" expression option that can be used
- * to enable or disable a filter in the timeline. Filters supporting this
- * option have this flag set. When the enable expression is false, the default
- * no-op filter_frame() function is called in place of the filter_frame()
- * callback defined on each input pad, thus the frame is passed unchanged to
- * the next filters.
- */
-#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC (1 << 16)
-/**
- * Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will
- * have its filter_frame() callback(s) called as usual even when the enable
- * expression is false. The filter will disable filtering within the
- * filter_frame() callback(s) itself, for example executing code depending on
- * the AVFilterContext->is_disabled value.
- */
-#define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL (1 << 17)
-/**
- * Handy mask to test whether the filter supports or no the timeline feature
- * (internally or generically).
- */
-#define AVFILTER_FLAG_SUPPORT_TIMELINE (AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL)
-
-/**
- * Filter definition. This defines the pads a filter contains, and all the
- * callback functions used to interact with the filter.
- */
-typedef struct AVFilter {
- /**
- * Filter name. Must be non-NULL and unique among filters.
- */
- const char *name;
-
- /**
- * A description of the filter. May be NULL.
- *
- * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
- */
- const char *description;
-
- /**
- * List of inputs, terminated by a zeroed element.
- *
- * NULL if there are no (static) inputs. Instances of filters with
- * AVFILTER_FLAG_DYNAMIC_INPUTS set may have more inputs than present in
- * this list.
- */
- const AVFilterPad *inputs;
- /**
- * List of outputs, terminated by a zeroed element.
- *
- * NULL if there are no (static) outputs. Instances of filters with
- * AVFILTER_FLAG_DYNAMIC_OUTPUTS set may have more outputs than present in
- * this list.
- */
- const AVFilterPad *outputs;
-
- /**
- * A class for the private data, used to declare filter private AVOptions.
- * This field is NULL for filters that do not declare any options.
- *
- * If this field is non-NULL, the first member of the filter private data
- * must be a pointer to AVClass, which will be set by libavfilter generic
- * code to this class.
- */
- const AVClass *priv_class;
-
- /**
- * A combination of AVFILTER_FLAG_*
- */
- int flags;
-
- /*****************************************************************
- * All fields below this line are not part of the public API. They
- * may not be used outside of libavfilter and can be changed and
- * removed at will.
- * New public fields should be added right above.
- *****************************************************************
- */
-
- /**
- * Filter initialization function.
- *
- * This callback will be called only once during the filter lifetime, after
- * all the options have been set, but before links between filters are
- * established and format negotiation is done.
- *
- * Basic filter initialization should be done here. Filters with dynamic
- * inputs and/or outputs should create those inputs/outputs here based on
- * provided options. No more changes to this filter's inputs/outputs can be
- * done after this callback.
- *
- * This callback must not assume that the filter links exist or frame
- * parameters are known.
- *
- * @ref AVFilter.uninit "uninit" is guaranteed to be called even if
- * initialization fails, so this callback does not have to clean up on
- * failure.
- *
- * @return 0 on success, a negative AVERROR on failure
- */
- int (*init)(AVFilterContext *ctx);
-
- /**
- * Should be set instead of @ref AVFilter.init "init" by the filters that
- * want to pass a dictionary of AVOptions to nested contexts that are
- * allocated during init.
- *
- * On return, the options dict should be freed and replaced with one that
- * contains all the options which could not be processed by this filter (or
- * with NULL if all the options were processed).
- *
- * Otherwise the semantics is the same as for @ref AVFilter.init "init".
- */
- int (*init_dict)(AVFilterContext *ctx, AVDictionary **options);
-
- /**
- * Filter uninitialization function.
- *
- * Called only once right before the filter is freed. Should deallocate any
- * memory held by the filter, release any buffer references, etc. It does
- * not need to deallocate the AVFilterContext.priv memory itself.
- *
- * This callback may be called even if @ref AVFilter.init "init" was not
- * called or failed, so it must be prepared to handle such a situation.
- */
- void (*uninit)(AVFilterContext *ctx);
-
- /**
- * Query formats supported by the filter on its inputs and outputs.
- *
- * This callback is called after the filter is initialized (so the inputs
- * and outputs are fixed), shortly before the format negotiation. This
- * callback may be called more than once.
- *
- * This callback must set AVFilterLink.out_formats on every input link and
- * AVFilterLink.in_formats on every output link to a list of pixel/sample
- * formats that the filter supports on that link. For audio links, this
- * filter must also set @ref AVFilterLink.in_samplerates "in_samplerates" /
- * @ref AVFilterLink.out_samplerates "out_samplerates" and
- * @ref AVFilterLink.in_channel_layouts "in_channel_layouts" /
- * @ref AVFilterLink.out_channel_layouts "out_channel_layouts" analogously.
- *
- * This callback may be NULL for filters with one input, in which case
- * libavfilter assumes that it supports all input formats and preserves
- * them on output.
- *
- * @return zero on success, a negative value corresponding to an
- * AVERROR code otherwise
- */
- int (*query_formats)(AVFilterContext *);
-
- int priv_size; ///< size of private data to allocate for the filter
-
- /**
- * Used by the filter registration system. Must not be touched by any other
- * code.
- */
- struct AVFilter *next;
-
- /**
- * Make the filter instance process a command.
- *
- * @param cmd the command to process, 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. This must not change when the command is not supported.
- * @param flags if AVFILTER_CMD_FLAG_FAST is set and the command would be
- * time consuming then a filter should treat it like an unsupported command
- *
- * @returns >=0 on success otherwise an error code.
- * AVERROR(ENOSYS) on unsupported commands
- */
- int (*process_command)(AVFilterContext *, const char *cmd, const char *arg, char *res, int res_len, int flags);
-
- /**
- * Filter initialization function, alternative to the init()
- * callback. Args contains the user-supplied parameters, opaque is
- * used for providing binary data.
- */
- int (*init_opaque)(AVFilterContext *ctx, void *opaque);
-} AVFilter;
-
-/**
- * Process multiple parts of the frame concurrently.
- */
-#define AVFILTER_THREAD_SLICE (1 << 0)
-
-typedef struct AVFilterInternal AVFilterInternal;
-
-/** An instance of a filter */
-struct AVFilterContext {
- const AVClass *av_class; ///< needed for av_log() and filters common options
-
- const AVFilter *filter; ///< the AVFilter of which this is an instance
-
- char *name; ///< name of this filter instance
-
- AVFilterPad *input_pads; ///< array of input pads
- AVFilterLink **inputs; ///< array of pointers to input links
- unsigned nb_inputs; ///< number of input pads
-
- AVFilterPad *output_pads; ///< array of output pads
- AVFilterLink **outputs; ///< array of pointers to output links
- unsigned nb_outputs; ///< number of output pads
-
- void *priv; ///< private data for use by the filter
-
- struct AVFilterGraph *graph; ///< filtergraph this filter belongs to
-
- /**
- * Type of multithreading being allowed/used. A combination of
- * AVFILTER_THREAD_* flags.
- *
- * May be set by the caller before initializing the filter to forbid some
- * or all kinds of multithreading for this filter. The default is allowing
- * everything.
- *
- * When the filter is initialized, this field is combined using bit AND with
- * AVFilterGraph.thread_type to get the final mask used for determining
- * allowed threading types. I.e. a threading type needs to be set in both
- * to be allowed.
- *
- * After the filter is initialized, libavfilter sets this field to the
- * threading type that is actually used (0 for no multithreading).
- */
- int thread_type;
-
- /**
- * An opaque struct for libavfilter internal use.
- */
- AVFilterInternal *internal;
-
- struct AVFilterCommand *command_queue;
-
- char *enable_str; ///< enable expression string
- void *enable; ///< parsed expression (AVExpr*)
- double *var_values; ///< variable values for the enable expression
- int is_disabled; ///< the enabled state from the last expression evaluation
-};
-
-/**
- * A link between two filters. This contains pointers to the source and
- * destination filters between which this link exists, and the indexes of
- * the pads involved. In addition, this link also contains the parameters
- * which have been negotiated and agreed upon between the filter, such as
- * image dimensions, format, etc.
- */
-struct AVFilterLink {
- AVFilterContext *src; ///< source filter
- AVFilterPad *srcpad; ///< output pad on the source filter
-
- AVFilterContext *dst; ///< dest filter
- AVFilterPad *dstpad; ///< input pad on the dest filter
-
- enum AVMediaType type; ///< filter media type
-
- /* These parameters apply only to video */
- int w; ///< agreed upon image width
- int h; ///< agreed upon image height
- AVRational sample_aspect_ratio; ///< agreed upon sample aspect ratio
- /* These parameters apply only to audio */
- uint64_t channel_layout; ///< channel layout of current buffer (see libavutil/channel_layout.h)
- int sample_rate; ///< samples per second
-
- int format; ///< agreed upon media format
-
- /**
- * Define the time base used by the PTS of the frames/samples
- * which will pass through this link.
- * During the configuration stage, each filter is supposed to
- * change only the output timebase, while the timebase of the
- * input link is assumed to be an unchangeable property.
- */
- AVRational time_base;
-
- /*****************************************************************
- * All fields below this line are not part of the public API. They
- * may not be used outside of libavfilter and can be changed and
- * removed at will.
- * New public fields should be added right above.
- *****************************************************************
- */
- /**
- * Lists of formats and channel layouts supported by the input and output
- * filters respectively. These lists are used for negotiating the format
- * to actually be used, which will be loaded into the format and
- * channel_layout members, above, when chosen.
- *
- */
- AVFilterFormats *in_formats;
- AVFilterFormats *out_formats;
-
- /**
- * Lists of channel layouts and sample rates used for automatic
- * negotiation.
- */
- AVFilterFormats *in_samplerates;
- AVFilterFormats *out_samplerates;
- struct AVFilterChannelLayouts *in_channel_layouts;
- struct AVFilterChannelLayouts *out_channel_layouts;
-
- /**
- * Audio only, the destination filter sets this to a non-zero value to
- * request that buffers with the given number of samples should be sent to
- * it. AVFilterPad.needs_fifo must also be set on the corresponding input
- * pad.
- * Last buffer before EOF will be padded with silence.
- */
- int request_samples;
-
- /** stage of the initialization of the link properties (dimensions, etc) */
- enum {
- AVLINK_UNINIT = 0, ///< not started
- AVLINK_STARTINIT, ///< started, but incomplete
- AVLINK_INIT ///< complete
- } init_state;
-
- /**
- * Graph the filter belongs to.
- */
- struct AVFilterGraph *graph;
-
- /**
- * Current timestamp of the link, as defined by the most recent
- * frame(s), in link time_base units.
- */
- int64_t current_pts;
-
- /**
- * Current timestamp of the link, as defined by the most recent
- * frame(s), in AV_TIME_BASE units.
- */
- int64_t current_pts_us;
-
- /**
- * Index in the age array.
- */
- int age_index;
-
- /**
- * Frame rate of the stream on the link, or 1/0 if unknown or variable;
- * if left to 0/0, will be automatically copied from the first input
- * of the source filter if it exists.
- *
- * Sources should set it to the best estimation of the real frame rate.
- * If the source frame rate is unknown or variable, set this to 1/0.
- * Filters should update it if necessary depending on their function.
- * Sinks can use it to set a default output frame rate.
- * It is similar to the r_frame_rate field in AVStream.
- */
- AVRational frame_rate;
-
- /**
- * Buffer partially filled with samples to achieve a fixed/minimum size.
- */
- AVFrame *partial_buf;
-
- /**
- * Size of the partial buffer to allocate.
- * Must be between min_samples and max_samples.
- */
- int partial_buf_size;
-
- /**
- * Minimum number of samples to filter at once. If filter_frame() is
- * called with fewer samples, it will accumulate them in partial_buf.
- * This field and the related ones must not be changed after filtering
- * has started.
- * If 0, all related fields are ignored.
- */
- int min_samples;
-
- /**
- * Maximum number of samples to filter at once. If filter_frame() is
- * called with more samples, it will split them.
- */
- int max_samples;
-
- /**
- * Link status.
- * If not zero, all attempts of filter_frame or request_frame
- * will fail with the corresponding code, and if necessary the reference
- * will be destroyed.
- * If request_frame returns an error, the status is set on the
- * corresponding link.
- * It can be set also be set by either the source or the destination
- * filter.
- */
- int status;
-
- /**
- * Number of channels.
- */
- int channels;
-
- /**
- * Link processing flags.
- */
- unsigned flags;
-
- /**
- * Number of past frames sent through the link.
- */
- int64_t frame_count;
-
- /**
- * A pointer to a FFVideoFramePool struct.
- */
- void *video_frame_pool;
-
- /**
- * True if a frame is currently wanted on the input of this filter.
- * Set when ff_request_frame() is called by the output,
- * cleared when the request is handled or forwarded.
- */
- int frame_wanted_in;
-
- /**
- * True if a frame is currently wanted on the output of this filter.
- * Set when ff_request_frame() is called by the output,
- * cleared when a frame is filtered.
- */
- int frame_wanted_out;
-};
-
-/**
- * Link two filters together.
- *
- * @param src the source filter
- * @param srcpad index of the output pad on the source filter
- * @param dst the destination filter
- * @param dstpad index of the input pad on the destination filter
- * @return zero on success
- */
-int avfilter_link(AVFilterContext *src, unsigned srcpad,
- AVFilterContext *dst, unsigned dstpad);
-
-/**
- * Free the link in *link, and set its pointer to NULL.
- */
-void avfilter_link_free(AVFilterLink **link);
-
-/**
- * Get the number of channels of a link.
- */
-int avfilter_link_get_channels(AVFilterLink *link);
-
-/**
- * Set the closed field of a link.
- * @deprecated applications are not supposed to mess with links, they should
- * close the sinks.
- */
-attribute_deprecated
-void avfilter_link_set_closed(AVFilterLink *link, int closed);
-
-/**
- * Negotiate the media format, dimensions, etc of all inputs to a filter.
- *
- * @param filter the filter to negotiate the properties for its inputs
- * @return zero on successful negotiation
- */
-int avfilter_config_links(AVFilterContext *filter);
-
-#define AVFILTER_CMD_FLAG_ONE 1 ///< Stop once a filter understood the command (for target=all for example), fast filters are favored automatically
-#define AVFILTER_CMD_FLAG_FAST 2 ///< Only execute command when its fast (like a video out that supports contrast adjustment in hw)
-
-/**
- * Make the filter instance process a command.
- * It is recommended to use avfilter_graph_send_command().
- */
-int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags);
-
-/** Initialize the filter system. Register all builtin filters. */
-void avfilter_register_all(void);
-
-#if FF_API_OLD_FILTER_REGISTER
-/** Uninitialize the filter system. Unregister all filters. */
-attribute_deprecated
-void avfilter_uninit(void);
-#endif
-
-/**
- * Register a filter. This is only needed if you plan to use
- * avfilter_get_by_name later to lookup the AVFilter structure by name. A
- * filter can still by instantiated with avfilter_graph_alloc_filter even if it
- * is not registered.
- *
- * @param filter the filter to register
- * @return 0 if the registration was successful, a negative value
- * otherwise
- */
-int avfilter_register(AVFilter *filter);
-
-/**
- * Get a filter definition matching the given name.
- *
- * @param name the filter name to find
- * @return the filter definition, if any matching one is registered.
- * NULL if none found.
- */
-#if !FF_API_NOCONST_GET_NAME
-const
-#endif
-AVFilter *avfilter_get_by_name(const char *name);
-
-/**
- * Iterate over all registered filters.
- * @return If prev is non-NULL, next registered filter after prev or NULL if
- * prev is the last filter. If prev is NULL, return the first registered filter.
- */
-const AVFilter *avfilter_next(const AVFilter *prev);
-
-#if FF_API_OLD_FILTER_REGISTER
-/**
- * If filter is NULL, returns a pointer to the first registered filter pointer,
- * if filter is non-NULL, returns the next pointer after filter.
- * If the returned pointer points to NULL, the last registered filter
- * was already reached.
- * @deprecated use avfilter_next()
- */
-attribute_deprecated
-AVFilter **av_filter_next(AVFilter **filter);
-#endif
-
-#if FF_API_AVFILTER_OPEN
-/**
- * Create a filter instance.
- *
- * @param filter_ctx put here a pointer to the created filter context
- * on success, NULL on failure
- * @param filter the filter to create an instance of
- * @param inst_name Name to give to the new instance. Can be NULL for none.
- * @return >= 0 in case of success, a negative error code otherwise
- * @deprecated use avfilter_graph_alloc_filter() instead
- */
-attribute_deprecated
-int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name);
-#endif
-
-
-#if FF_API_AVFILTER_INIT_FILTER
-/**
- * Initialize a filter.
- *
- * @param filter the filter to initialize
- * @param args A string of parameters to use when initializing the filter.
- * The format and meaning of this string varies by filter.
- * @param opaque Any extra non-string data needed by the filter. The meaning
- * of this parameter varies by filter.
- * @return zero on success
- */
-attribute_deprecated
-int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque);
-#endif
-
-/**
- * Initialize a filter with the supplied parameters.
- *
- * @param ctx uninitialized filter context to initialize
- * @param args Options to initialize the filter with. This must be a
- * ':'-separated list of options in the 'key=value' form.
- * May be NULL if the options have been set directly using the
- * AVOptions API or there are no options that need to be set.
- * @return 0 on success, a negative AVERROR on failure
- */
-int avfilter_init_str(AVFilterContext *ctx, const char *args);
-
-/**
- * Initialize a filter with the supplied dictionary of options.
- *
- * @param ctx uninitialized filter context to initialize
- * @param options An AVDictionary filled with options for this filter. On
- * return this parameter will be destroyed and replaced with
- * a dict containing options that were not found. This dictionary
- * must be freed by the caller.
- * May be NULL, then this function is equivalent to
- * avfilter_init_str() with the second parameter set to NULL.
- * @return 0 on success, a negative AVERROR on failure
- *
- * @note This function and avfilter_init_str() do essentially the same thing,
- * the difference is in manner in which the options are passed. It is up to the
- * calling code to choose whichever is more preferable. The two functions also
- * behave differently when some of the provided options are not declared as
- * supported by the filter. In such a case, avfilter_init_str() will fail, but
- * this function will leave those extra options in the options AVDictionary and
- * continue as usual.
- */
-int avfilter_init_dict(AVFilterContext *ctx, AVDictionary **options);
-
-/**
- * Free a filter context. This will also remove the filter from its
- * filtergraph's list of filters.
- *
- * @param filter the filter to free
- */
-void avfilter_free(AVFilterContext *filter);
-
-/**
- * Insert a filter in the middle of an existing link.
- *
- * @param link the link into which the filter should be inserted
- * @param filt the filter to be inserted
- * @param filt_srcpad_idx the input pad on the filter to connect
- * @param filt_dstpad_idx the output pad on the filter to connect
- * @return zero on success
- */
-int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
- unsigned filt_srcpad_idx, unsigned filt_dstpad_idx);
-
-/**
- * @return AVClass for AVFilterContext.
- *
- * @see av_opt_find().
- */
-const AVClass *avfilter_get_class(void);
-
-typedef struct AVFilterGraphInternal AVFilterGraphInternal;
-
-/**
- * A function pointer passed to the @ref AVFilterGraph.execute callback to be
- * executed multiple times, possibly in parallel.
- *
- * @param ctx the filter context the job belongs to
- * @param arg an opaque parameter passed through from @ref
- * AVFilterGraph.execute
- * @param jobnr the index of the job being executed
- * @param nb_jobs the total number of jobs
- *
- * @return 0 on success, a negative AVERROR on error
- */
-typedef int (avfilter_action_func)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
-
-/**
- * A function executing multiple jobs, possibly in parallel.
- *
- * @param ctx the filter context to which the jobs belong
- * @param func the function to be called multiple times
- * @param arg the argument to be passed to func
- * @param ret a nb_jobs-sized array to be filled with return values from each
- * invocation of func
- * @param nb_jobs the number of jobs to execute
- *
- * @return 0 on success, a negative AVERROR on error
- */
-typedef int (avfilter_execute_func)(AVFilterContext *ctx, avfilter_action_func *func,
- void *arg, int *ret, int nb_jobs);
-
-typedef struct AVFilterGraph {
- const AVClass *av_class;
- AVFilterContext **filters;
- unsigned nb_filters;
-
- char *scale_sws_opts; ///< sws options to use for the auto-inserted scale filters
- char *resample_lavr_opts; ///< libavresample options to use for the auto-inserted resample filters
-
- /**
- * Type of multithreading allowed for filters in this graph. A combination
- * of AVFILTER_THREAD_* flags.
- *
- * May be set by the caller at any point, the setting will apply to all
- * filters initialized after that. The default is allowing everything.
- *
- * When a filter in this graph is initialized, this field is combined using
- * bit AND with AVFilterContext.thread_type to get the final mask used for
- * determining allowed threading types. I.e. a threading type needs to be
- * set in both to be allowed.
- */
- int thread_type;
-
- /**
- * Maximum number of threads used by filters in this graph. May be set by
- * the caller before adding any filters to the filtergraph. Zero (the
- * default) means that the number of threads is determined automatically.
- */
- int nb_threads;
-
- /**
- * Opaque object for libavfilter internal use.
- */
- AVFilterGraphInternal *internal;
-
- /**
- * Opaque user data. May be set by the caller to an arbitrary value, e.g. to
- * be used from callbacks like @ref AVFilterGraph.execute.
- * Libavfilter will not touch this field in any way.
- */
- void *opaque;
-
- /**
- * This callback may be set by the caller immediately after allocating the
- * graph and before adding any filters to it, to provide a custom
- * multithreading implementation.
- *
- * If set, filters with slice threading capability will call this callback
- * to execute multiple jobs in parallel.
- *
- * If this field is left unset, libavfilter will use its internal
- * implementation, which may or may not be multithreaded depending on the
- * platform and build options.
- */
- avfilter_execute_func *execute;
-
- 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.
- *
- * @return the allocated filter graph on success or NULL.
- */
-AVFilterGraph *avfilter_graph_alloc(void);
-
-/**
- * Create a new filter instance in a filter graph.
- *
- * @param graph graph in which the new filter will be used
- * @param filter the filter to create an instance of
- * @param name Name to give to the new instance (will be copied to
- * AVFilterContext.name). This may be used by the caller to identify
- * different filters, libavfilter itself assigns no semantics to
- * this parameter. May be NULL.
- *
- * @return the context of the newly created filter instance (note that it is
- * also retrievable directly through AVFilterGraph.filters or with
- * avfilter_graph_get_filter()) on success or NULL on failure.
- */
-AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
- const AVFilter *filter,
- const char *name);
-
-/**
- * Get a filter instance identified by instance name from graph.
- *
- * @param graph filter graph to search through.
- * @param name filter instance name (should be unique in the graph).
- * @return the pointer to the found filter instance or NULL if it
- * cannot be found.
- */
-AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name);
-
-#if FF_API_AVFILTER_OPEN
-/**
- * Add an existing filter instance to a filter graph.
- *
- * @param graphctx the filter graph
- * @param filter the filter to be added
- *
- * @deprecated use avfilter_graph_alloc_filter() to allocate a filter in a
- * filter graph
- */
-attribute_deprecated
-int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter);
-#endif
-
-/**
- * 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, const 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 aresample 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.
- *
- * @note The caller must provide the lists of inputs and outputs,
- * which therefore must be known before calling the function.
- *
- * @note The inputs parameter describes inputs of the already existing
- * 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.
- *
- * @param graph the filter graph where to link the parsed graph context
- * @param filters string to be parsed
- * @param inputs linked list to the inputs of the graph
- * @param outputs linked list to the outputs of the graph
- * @return zero 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.
- *
- * In the graph filters description, if the input label of the first
- * filter is not specified, "in" is assumed; if the output label of
- * the last filter is not specified, "out" is assumed.
- *
- * @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_ptr(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 This function returns the inputs and outputs that are left
- * unlinked after parsing the graph and the caller then deals with
- * them.
- * @note This function 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 send, 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 alphanumeric 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_AVFILTER_H */
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