mirror of
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e3fb74f7f9
Also adds a new flag to mark filters which are aware of hwframes and will perform this task themselves, and marks all appropriate filters with this flag. This is required to allow software-mapped hardware frames to work, because we need to have the frames context available for any later mapping operation in the filter graph. The output from the filter graph should only propagate further to an encoder if the hardware format actually matches the visible format (mapped frames are valid here and have an hw_frames_ctx, but this should not be given to the encoder as its hardware context).
828 lines
30 KiB
C
828 lines
30 KiB
C
/*
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* filter layer
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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_AVFILTER_H
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#define AVFILTER_AVFILTER_H
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/**
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* @file
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* @ingroup lavfi
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* Main libavfilter public API header
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*/
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/**
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* @defgroup lavfi Libavfilter - graph-based frame editing library
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* @{
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/avutil.h"
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#include "libavutil/buffer.h"
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#include "libavutil/frame.h"
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#include "libavutil/log.h"
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#include "libavutil/samplefmt.h"
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#include "libavutil/pixfmt.h"
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#include "libavutil/rational.h"
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#include <stddef.h>
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#include "libavfilter/version.h"
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/**
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* Return the LIBAVFILTER_VERSION_INT constant.
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*/
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unsigned avfilter_version(void);
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/**
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* Return the libavfilter build-time configuration.
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*/
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const char *avfilter_configuration(void);
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/**
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* Return the libavfilter license.
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*/
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const char *avfilter_license(void);
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typedef struct AVFilterContext AVFilterContext;
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typedef struct AVFilterLink AVFilterLink;
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typedef struct AVFilterPad AVFilterPad;
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typedef struct AVFilterFormats AVFilterFormats;
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/**
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* Get the number of elements in a NULL-terminated array of AVFilterPads (e.g.
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* AVFilter.inputs/outputs).
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*/
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int avfilter_pad_count(const AVFilterPad *pads);
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/**
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* Get the name of an AVFilterPad.
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*
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* @param pads an array of AVFilterPads
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* @param pad_idx index of the pad in the array it; is the caller's
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* responsibility to ensure the index is valid
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*
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* @return name of the pad_idx'th pad in pads
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*/
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const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx);
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/**
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* Get the type of an AVFilterPad.
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*
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* @param pads an array of AVFilterPads
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* @param pad_idx index of the pad in the array; it is the caller's
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* responsibility to ensure the index is valid
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*
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* @return type of the pad_idx'th pad in pads
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*/
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enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx);
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/**
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* The number of the filter inputs is not determined just by AVFilter.inputs.
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* The filter might add additional inputs during initialization depending on the
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* options supplied to it.
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*/
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#define AVFILTER_FLAG_DYNAMIC_INPUTS (1 << 0)
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/**
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* The number of the filter outputs is not determined just by AVFilter.outputs.
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* The filter might add additional outputs during initialization depending on
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* the options supplied to it.
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*/
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#define AVFILTER_FLAG_DYNAMIC_OUTPUTS (1 << 1)
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/**
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* The filter supports multithreading by splitting frames into multiple parts
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* and processing them concurrently.
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*/
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#define AVFILTER_FLAG_SLICE_THREADS (1 << 2)
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/**
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* Filter definition. This defines the pads a filter contains, and all the
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* callback functions used to interact with the filter.
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*/
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typedef struct AVFilter {
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/**
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* Filter name. Must be non-NULL and unique among filters.
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*/
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const char *name;
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/**
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* A description of the filter. May be NULL.
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*
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* You should use the NULL_IF_CONFIG_SMALL() macro to define it.
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*/
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const char *description;
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/**
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* List of inputs, terminated by a zeroed element.
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*
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* NULL if there are no (static) inputs. Instances of filters with
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* AVFILTER_FLAG_DYNAMIC_INPUTS set may have more inputs than present in
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* this list.
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*/
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const AVFilterPad *inputs;
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/**
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* List of outputs, terminated by a zeroed element.
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*
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* NULL if there are no (static) outputs. Instances of filters with
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* AVFILTER_FLAG_DYNAMIC_OUTPUTS set may have more outputs than present in
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* this list.
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*/
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const AVFilterPad *outputs;
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/**
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* A class for the private data, used to declare filter private AVOptions.
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* This field is NULL for filters that do not declare any options.
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*
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* If this field is non-NULL, the first member of the filter private data
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* must be a pointer to AVClass, which will be set by libavfilter generic
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* code to this class.
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*/
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const AVClass *priv_class;
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/**
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* A combination of AVFILTER_FLAG_*
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*/
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int flags;
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/*****************************************************************
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* All fields below this line are not part of the public API. They
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* may not be used outside of libavfilter and can be changed and
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* removed at will.
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* New public fields should be added right above.
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*****************************************************************
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*/
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/**
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* Filter initialization function.
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*
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* This callback will be called only once during the filter lifetime, after
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* all the options have been set, but before links between filters are
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* established and format negotiation is done.
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*
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* Basic filter initialization should be done here. Filters with dynamic
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* inputs and/or outputs should create those inputs/outputs here based on
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* provided options. No more changes to this filter's inputs/outputs can be
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* done after this callback.
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*
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* This callback must not assume that the filter links exist or frame
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* parameters are known.
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*
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* @ref AVFilter.uninit "uninit" is guaranteed to be called even if
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* initialization fails, so this callback does not have to clean up on
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* failure.
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*
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* @return 0 on success, a negative AVERROR on failure
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*/
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int (*init)(AVFilterContext *ctx);
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/**
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* Should be set instead of @ref AVFilter.init "init" by the filters that
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* want to pass a dictionary of AVOptions to nested contexts that are
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* allocated during init.
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*
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* On return, the options dict should be freed and replaced with one that
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* contains all the options which could not be processed by this filter (or
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* with NULL if all the options were processed).
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*
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* Otherwise the semantics is the same as for @ref AVFilter.init "init".
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*/
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int (*init_dict)(AVFilterContext *ctx, AVDictionary **options);
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/**
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* Filter uninitialization function.
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*
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* Called only once right before the filter is freed. Should deallocate any
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* memory held by the filter, release any buffer references, etc. It does
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* not need to deallocate the AVFilterContext.priv memory itself.
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*
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* This callback may be called even if @ref AVFilter.init "init" was not
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* called or failed, so it must be prepared to handle such a situation.
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*/
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void (*uninit)(AVFilterContext *ctx);
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/**
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* Query formats supported by the filter on its inputs and outputs.
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*
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* This callback is called after the filter is initialized (so the inputs
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* and outputs are fixed), shortly before the format negotiation. This
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* callback may be called more than once.
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*
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* This callback must set AVFilterLink.out_formats on every input link and
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* AVFilterLink.in_formats on every output link to a list of pixel/sample
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* formats that the filter supports on that link. For audio links, this
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* filter must also set @ref AVFilterLink.in_samplerates "in_samplerates" /
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* @ref AVFilterLink.out_samplerates "out_samplerates" and
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* @ref AVFilterLink.in_channel_layouts "in_channel_layouts" /
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* @ref AVFilterLink.out_channel_layouts "out_channel_layouts" analogously.
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*
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* This callback may be NULL for filters with one input, in which case
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* libavfilter assumes that it supports all input formats and preserves
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* them on output.
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*
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* @return zero on success, a negative value corresponding to an
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* AVERROR code otherwise
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*/
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int (*query_formats)(AVFilterContext *);
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int priv_size; ///< size of private data to allocate for the filter
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int flags_internal; ///< Additional flags for avfilter internal use only.
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/**
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* Used by the filter registration system. Must not be touched by any other
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* code.
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*/
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struct AVFilter *next;
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} AVFilter;
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/**
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* Process multiple parts of the frame concurrently.
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*/
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#define AVFILTER_THREAD_SLICE (1 << 0)
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typedef struct AVFilterInternal AVFilterInternal;
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/** An instance of a filter */
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struct AVFilterContext {
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const AVClass *av_class; ///< needed for av_log()
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const AVFilter *filter; ///< the AVFilter of which this is an instance
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char *name; ///< name of this filter instance
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AVFilterPad *input_pads; ///< array of input pads
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AVFilterLink **inputs; ///< array of pointers to input links
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unsigned nb_inputs; ///< number of input pads
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AVFilterPad *output_pads; ///< array of output pads
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AVFilterLink **outputs; ///< array of pointers to output links
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unsigned nb_outputs; ///< number of output pads
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void *priv; ///< private data for use by the filter
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struct AVFilterGraph *graph; ///< filtergraph this filter belongs to
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/**
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* Type of multithreading being allowed/used. A combination of
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* AVFILTER_THREAD_* flags.
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*
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* May be set by the caller before initializing the filter to forbid some
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* or all kinds of multithreading for this filter. The default is allowing
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* everything.
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*
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* When the filter is initialized, this field is combined using bit AND with
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* AVFilterGraph.thread_type to get the final mask used for determining
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* allowed threading types. I.e. a threading type needs to be set in both
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* to be allowed.
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*
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* After the filter is initialzed, libavfilter sets this field to the
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* threading type that is actually used (0 for no multithreading).
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*/
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int thread_type;
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/**
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* An opaque struct for libavfilter internal use.
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*/
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AVFilterInternal *internal;
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/**
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* For filters which will create hardware frames, sets the device the
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* filter should create them in. All other filters will ignore this field:
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* in particular, a filter which consumes or processes hardware frames will
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* instead use the hw_frames_ctx field in AVFilterLink to carry the
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* hardware context information.
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*/
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AVBufferRef *hw_device_ctx;
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};
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/**
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* A link between two filters. This contains pointers to the source and
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* destination filters between which this link exists, and the indexes of
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* the pads involved. In addition, this link also contains the parameters
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* which have been negotiated and agreed upon between the filter, such as
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* image dimensions, format, etc.
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*/
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struct AVFilterLink {
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AVFilterContext *src; ///< source filter
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AVFilterPad *srcpad; ///< output pad on the source filter
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AVFilterContext *dst; ///< dest filter
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AVFilterPad *dstpad; ///< input pad on the dest filter
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enum AVMediaType type; ///< filter media type
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/* These parameters apply only to video */
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int w; ///< agreed upon image width
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int h; ///< agreed upon image height
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AVRational sample_aspect_ratio; ///< agreed upon sample aspect ratio
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/* These two parameters apply only to audio */
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uint64_t channel_layout; ///< channel layout of current buffer (see libavutil/channel_layout.h)
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int sample_rate; ///< samples per second
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int format; ///< agreed upon media format
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/**
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* Define the time base used by the PTS of the frames/samples
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* which will pass through this link.
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* During the configuration stage, each filter is supposed to
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* change only the output timebase, while the timebase of the
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* input link is assumed to be an unchangeable property.
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*/
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AVRational time_base;
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/*****************************************************************
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* All fields below this line are not part of the public API. They
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* may not be used outside of libavfilter and can be changed and
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* removed at will.
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* New public fields should be added right above.
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*****************************************************************
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*/
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/**
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* Lists of formats supported by the input and output filters respectively.
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* These lists are used for negotiating the format to actually be used,
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* which will be loaded into the format member, above, when chosen.
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*/
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AVFilterFormats *in_formats;
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AVFilterFormats *out_formats;
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/**
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* Lists of channel layouts and sample rates used for automatic
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* negotiation.
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*/
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AVFilterFormats *in_samplerates;
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AVFilterFormats *out_samplerates;
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struct AVFilterChannelLayouts *in_channel_layouts;
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struct AVFilterChannelLayouts *out_channel_layouts;
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/**
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* Audio only, the destination filter sets this to a non-zero value to
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* request that buffers with the given number of samples should be sent to
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* it. AVFilterPad.needs_fifo must also be set on the corresponding input
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* pad.
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* Last buffer before EOF will be padded with silence.
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*/
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int request_samples;
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/** stage of the initialization of the link properties (dimensions, etc) */
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enum {
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AVLINK_UNINIT = 0, ///< not started
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AVLINK_STARTINIT, ///< started, but incomplete
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AVLINK_INIT ///< complete
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} init_state;
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/**
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* Frame rate of the stream on the link, or 1/0 if unknown or variable;
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* if left to 0/0, will be automatically copied from the first input
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* of the source filter if it exists.
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*
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* Sources should set it to the real constant frame rate.
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* If the source frame rate is unknown or variable, set this to 1/0.
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* Filters should update it if necessary depending on their function.
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* Sinks can use it to set a default output frame rate.
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*/
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AVRational frame_rate;
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/**
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* For hwaccel pixel formats, this should be a reference to the
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* AVHWFramesContext describing the frames.
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*/
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AVBufferRef *hw_frames_ctx;
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};
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/**
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* Link two filters together.
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*
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* @param src the source filter
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* @param srcpad index of the output pad on the source filter
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* @param dst the destination filter
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* @param dstpad index of the input pad on the destination filter
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* @return zero on success
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*/
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int avfilter_link(AVFilterContext *src, unsigned srcpad,
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AVFilterContext *dst, unsigned dstpad);
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/**
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* Negotiate the media format, dimensions, etc of all inputs to a filter.
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*
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* @param filter the filter to negotiate the properties for its inputs
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* @return zero on successful negotiation
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*/
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int avfilter_config_links(AVFilterContext *filter);
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/** Initialize the filter system. Register all builtin filters. */
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void avfilter_register_all(void);
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#if FF_API_OLD_FILTER_REGISTER
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/** Uninitialize the filter system. Unregister all filters. */
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attribute_deprecated
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void avfilter_uninit(void);
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#endif
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/**
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* Register a filter. This is only needed if you plan to use
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* avfilter_get_by_name later to lookup the AVFilter structure by name. A
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* filter can still by instantiated with avfilter_graph_alloc_filter even if it
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* is not registered.
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*
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* @param filter the filter to register
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* @return 0 if the registration was successful, a negative value
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* otherwise
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*/
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int avfilter_register(AVFilter *filter);
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/**
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* Get a filter definition matching the given name.
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*
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* @param name the filter name to find
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* @return the filter definition, if any matching one is registered.
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* NULL if none found.
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*/
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#if !FF_API_NOCONST_GET_NAME
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const
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#endif
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AVFilter *avfilter_get_by_name(const char *name);
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/**
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* Iterate over all registered filters.
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* @return If prev is non-NULL, next registered filter after prev or NULL if
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* prev is the last filter. If prev is NULL, return the first registered filter.
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*/
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const AVFilter *avfilter_next(const AVFilter *prev);
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#if FF_API_OLD_FILTER_REGISTER
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/**
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* If filter is NULL, returns a pointer to the first registered filter pointer,
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* if filter is non-NULL, returns the next pointer after filter.
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* If the returned pointer points to NULL, the last registered filter
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* was already reached.
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* @deprecated use avfilter_next()
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*/
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attribute_deprecated
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AVFilter **av_filter_next(AVFilter **filter);
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#endif
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#if FF_API_AVFILTER_OPEN
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/**
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* Create a filter instance.
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*
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* @param filter_ctx put here a pointer to the created filter context
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* on success, NULL on failure
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* @param filter the filter to create an instance of
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* @param inst_name Name to give to the new instance. Can be NULL for none.
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* @return >= 0 in case of success, a negative error code otherwise
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* @deprecated use avfilter_graph_alloc_filter() instead
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*/
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attribute_deprecated
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int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name);
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#endif
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#if FF_API_AVFILTER_INIT_FILTER
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/**
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* Initialize a filter.
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*
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* @param filter the filter to initialize
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* @param args A string of parameters to use when initializing the filter.
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* The format and meaning of this string varies by filter.
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* @param opaque Any extra non-string data needed by the filter. The meaning
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* of this parameter varies by filter.
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* @return zero on success
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*/
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attribute_deprecated
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int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque);
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#endif
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/**
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* Initialize a filter with the supplied parameters.
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*
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* @param ctx uninitialized filter context to initialize
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* @param args Options to initialize the filter with. This must be a
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* ':'-separated list of options in the 'key=value' form.
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* May be NULL if the options have been set directly using the
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* AVOptions API or there are no options that need to be set.
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|
* @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;
|
|
} 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 or failure.
|
|
*/
|
|
AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
|
|
const AVFilter *filter,
|
|
const char *name);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
#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);
|
|
|
|
/**
|
|
* 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 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.
|
|
*
|
|
* @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);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* AVFILTER_AVFILTER_H */
|