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1365 lines
52 KiB
C
1365 lines
52 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 FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_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
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* Graph-based frame editing library.
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*
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* @{
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*/
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#include <stddef.h>
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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/dict.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 "libavfilter/version_major.h"
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#ifndef HAVE_AV_CONFIG_H
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/* When included as part of the ffmpeg build, only include the major version
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* to avoid unnecessary rebuilds. When included externally, keep including
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* the full version information. */
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#include "libavfilter/version.h"
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#endif
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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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typedef struct AVFilterChannelLayouts AVFilterChannelLayouts;
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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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* The filter is a "metadata" filter - it does not modify the frame data in any
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* way. It may only affect the metadata (i.e. those fields copied by
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* av_frame_copy_props()).
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*
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* More precisely, this means:
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* - video: the data of any frame output by the filter must be exactly equal to
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* some frame that is received on one of its inputs. Furthermore, all frames
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* produced on a given output must correspond to frames received on the same
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* input and their order must be unchanged. Note that the filter may still
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* drop or duplicate the frames.
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* - audio: the data produced by the filter on any of its outputs (viewed e.g.
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* as an array of interleaved samples) must be exactly equal to the data
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* received by the filter on one of its inputs.
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*/
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#define AVFILTER_FLAG_METADATA_ONLY (1 << 3)
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/**
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* The filter can create hardware frames using AVFilterContext.hw_device_ctx.
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*/
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#define AVFILTER_FLAG_HWDEVICE (1 << 4)
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/**
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* Some filters support a generic "enable" expression option that can be used
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* to enable or disable a filter in the timeline. Filters supporting this
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* option have this flag set. When the enable expression is false, the default
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* no-op filter_frame() function is called in place of the filter_frame()
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* callback defined on each input pad, thus the frame is passed unchanged to
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* the next filters.
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*/
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#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC (1 << 16)
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/**
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* Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will
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* have its filter_frame() callback(s) called as usual even when the enable
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* expression is false. The filter will disable filtering within the
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* filter_frame() callback(s) itself, for example executing code depending on
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* the AVFilterContext->is_disabled value.
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*/
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#define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL (1 << 17)
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/**
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* Handy mask to test whether the filter supports or no the timeline feature
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* (internally or generically).
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*/
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#define AVFILTER_FLAG_SUPPORT_TIMELINE (AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL)
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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 static inputs.
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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 static outputs.
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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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* The number of entries in the list of inputs.
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*/
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uint8_t nb_inputs;
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/**
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* The number of entries in the list of outputs.
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*/
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uint8_t nb_outputs;
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/**
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* This field determines the state of the formats union.
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* It is an enum FilterFormatsState value.
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*/
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uint8_t formats_state;
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/**
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* Filter pre-initialization function
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*
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* This callback will be called immediately after the filter context is
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* allocated, to allow allocating and initing sub-objects.
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*
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* If this callback is not NULL, the uninit callback will be called on
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* allocation failure.
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*
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* @return 0 on success,
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* AVERROR code on failure (but the code will be
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* dropped and treated as ENOMEM by the calling code)
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*/
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int (*preinit)(AVFilterContext *ctx);
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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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* 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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* The state of the following union is determined by formats_state.
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* See the documentation of enum FilterFormatsState in internal.h.
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*/
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union {
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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's
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* @ref AVFilterFormatsConfig.formats "outcfg.formats"
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* on every input link and
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* @ref AVFilterFormatsConfig.formats "incfg.formats"
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* on every output link to a list of pixel/sample formats that the filter
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* supports on that link.
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* For video links, this filter may also set
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* @ref AVFilterFormatsConfig.color_spaces "incfg.color_spaces"
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* /
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* @ref AVFilterFormatsConfig.color_spaces "outcfg.color_spaces"
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* and @ref AVFilterFormatsConfig.color_ranges "incfg.color_ranges"
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* /
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* @ref AVFilterFormatsConfig.color_ranges "outcfg.color_ranges"
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* analogously.
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* For audio links, this filter must also set
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* @ref AVFilterFormatsConfig.samplerates "incfg.samplerates"
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* /
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* @ref AVFilterFormatsConfig.samplerates "outcfg.samplerates"
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* and @ref AVFilterFormatsConfig.channel_layouts "incfg.channel_layouts"
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* /
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* @ref AVFilterFormatsConfig.channel_layouts "outcfg.channel_layouts"
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* analogously.
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*
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* This callback must never be NULL if the union is in this state.
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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_func)(AVFilterContext *);
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/**
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* A pointer to an array of admissible pixel formats delimited
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* by AV_PIX_FMT_NONE. The generic code will use this list
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* to indicate that this filter supports each of these pixel formats,
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* provided that all inputs and outputs use the same pixel format.
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*
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* In addition to that the generic code will mark all inputs
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* and all outputs as supporting all color spaces and ranges, as
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* long as all inputs and outputs use the same color space/range.
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*
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* This list must never be NULL if the union is in this state.
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* The type of all inputs and outputs of filters using this must
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* be AVMEDIA_TYPE_VIDEO.
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*/
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const enum AVPixelFormat *pixels_list;
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/**
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* Analogous to pixels, but delimited by AV_SAMPLE_FMT_NONE
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* and restricted to filters that only have AVMEDIA_TYPE_AUDIO
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* inputs and outputs.
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*
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* In addition to that the generic code will mark all inputs
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* and all outputs as supporting all sample rates and every
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* channel count and channel layout, as long as all inputs
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* and outputs use the same sample rate and channel count/layout.
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*/
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const enum AVSampleFormat *samples_list;
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/**
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* Equivalent to { pix_fmt, AV_PIX_FMT_NONE } as pixels_list.
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*/
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enum AVPixelFormat pix_fmt;
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/**
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* Equivalent to { sample_fmt, AV_SAMPLE_FMT_NONE } as samples_list.
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*/
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enum AVSampleFormat sample_fmt;
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} formats;
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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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* Make the filter instance process a command.
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*
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* @param cmd the command to process, for handling simplicity all commands must be alphanumeric only
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* @param arg the argument for the command
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* @param res a buffer with size res_size where the filter(s) can return a response. This must not change when the command is not supported.
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* @param flags if AVFILTER_CMD_FLAG_FAST is set and the command would be
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* time consuming then a filter should treat it like an unsupported command
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*
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* @returns >=0 on success otherwise an error code.
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* AVERROR(ENOSYS) on unsupported commands
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*/
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int (*process_command)(AVFilterContext *, const char *cmd, const char *arg, char *res, int res_len, int flags);
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/**
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* Filter activation function.
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*
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* Called when any processing is needed from the filter, instead of any
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* filter_frame and request_frame on pads.
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*
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* The function must examine inlinks and outlinks and perform a single
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* step of processing. If there is nothing to do, the function must do
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* nothing and not return an error. If more steps are or may be
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* possible, it must use ff_filter_set_ready() to schedule another
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* activation.
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*/
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int (*activate)(AVFilterContext *ctx);
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} AVFilter;
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/**
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* Get the number of elements in an AVFilter's inputs or outputs array.
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*/
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unsigned avfilter_filter_pad_count(const AVFilter *filter, int is_output);
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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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/** An instance of a filter */
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struct AVFilterContext {
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const AVClass *av_class; ///< needed for av_log() and filters common options
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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 initialized, 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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* Max number of threads allowed in this filter instance.
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* If <= 0, its value is ignored.
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* Overrides global number of threads set per filter graph.
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*/
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int nb_threads;
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struct AVFilterCommand *command_queue;
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char *enable_str; ///< enable expression string
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void *enable; ///< parsed expression (AVExpr*)
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double *var_values; ///< variable values for the enable expression
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int is_disabled; ///< the enabled state from the last expression evaluation
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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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* May be set by the caller on filters flagged with AVFILTER_FLAG_HWDEVICE
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* before initializing the filter with avfilter_init_str() or
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* avfilter_init_dict().
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*/
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AVBufferRef *hw_device_ctx;
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/**
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* Ready status of the filter.
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* A non-0 value means that the filter needs activating;
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* a higher value suggests a more urgent activation.
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*/
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unsigned ready;
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/**
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* Sets the number of extra hardware frames which the filter will
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* allocate on its output links for use in following filters or by
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* the caller.
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*
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* Some hardware filters require all frames that they will use for
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* output to be defined in advance before filtering starts. For such
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* filters, any hardware frame pools used for output must therefore be
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* of fixed size. The extra frames set here are on top of any number
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* that the filter needs internally in order to operate normally.
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*
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* This field must be set before the graph containing this filter is
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* configured.
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*/
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int extra_hw_frames;
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};
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/**
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* Lists of formats / etc. supported by an end of a link.
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*
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* This structure is directly part of AVFilterLink, in two copies:
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* one for the source filter, one for the destination filter.
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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 and channel_layout members of
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* AVFilterLink, when chosen.
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*/
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typedef struct AVFilterFormatsConfig {
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/**
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* List of supported formats (pixel or sample).
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*/
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AVFilterFormats *formats;
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/**
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* Lists of supported sample rates, only for audio.
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*/
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AVFilterFormats *samplerates;
|
|
|
|
/**
|
|
* Lists of supported channel layouts, only for audio.
|
|
*/
|
|
AVFilterChannelLayouts *channel_layouts;
|
|
|
|
/**
|
|
* Lists of supported YUV color metadata, only for YUV video.
|
|
*/
|
|
AVFilterFormats *color_spaces; ///< AVColorSpace
|
|
AVFilterFormats *color_ranges; ///< AVColorRange
|
|
|
|
} AVFilterFormatsConfig;
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Applications must not normally access the link structure directly.
|
|
* Use the buffersrc and buffersink API instead.
|
|
* In the future, access to the header may be reserved for filters
|
|
* implementation.
|
|
*/
|
|
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
|
|
|
|
int format; ///< agreed upon media format
|
|
|
|
/* 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
|
|
/**
|
|
* For non-YUV links, these are respectively set to fallback values (as
|
|
* appropriate for that colorspace).
|
|
*
|
|
* Note: This includes grayscale formats, as these are currently treated
|
|
* as forced full range always.
|
|
*/
|
|
enum AVColorSpace colorspace; ///< agreed upon YUV color space
|
|
enum AVColorRange color_range; ///< agreed upon YUV color range
|
|
|
|
/* These parameters apply only to audio */
|
|
int sample_rate; ///< samples per second
|
|
AVChannelLayout ch_layout; ///< channel layout of current buffer (see libavutil/channel_layout.h)
|
|
|
|
/**
|
|
* 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 supported formats / etc. supported by the input filter.
|
|
*/
|
|
AVFilterFormatsConfig incfg;
|
|
|
|
/**
|
|
* Lists of supported formats / etc. supported by the output filter.
|
|
*/
|
|
AVFilterFormatsConfig outcfg;
|
|
};
|
|
|
|
/**
|
|
* 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);
|
|
|
|
#if FF_API_LINK_PUBLIC
|
|
/**
|
|
* @deprecated this function should never be called by users
|
|
*/
|
|
attribute_deprecated
|
|
void avfilter_link_free(AVFilterLink **link);
|
|
|
|
/**
|
|
* @deprecated this function should never be called by users
|
|
*/
|
|
attribute_deprecated
|
|
int avfilter_config_links(AVFilterContext *filter);
|
|
#endif
|
|
|
|
#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);
|
|
|
|
/**
|
|
* Iterate over all registered filters.
|
|
*
|
|
* @param opaque a pointer where libavfilter will store the iteration state. Must
|
|
* point to NULL to start the iteration.
|
|
*
|
|
* @return the next registered filter or NULL when the iteration is
|
|
* finished
|
|
*/
|
|
const AVFilter *av_filter_iterate(void **opaque);
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
const AVFilter *avfilter_get_by_name(const char *name);
|
|
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* 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
|
|
|
|
/**
|
|
* 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 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
|
|
} 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);
|
|
|
|
/**
|
|
* Create and add a filter instance into an existing graph.
|
|
* The filter instance is created from the filter filt and inited
|
|
* with the parameter args. opaque is currently ignored.
|
|
*
|
|
* 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);
|
|
|
|
/**
|
|
* Parameters of a filter's input or output pad.
|
|
*
|
|
* Created as a child of AVFilterParams by avfilter_graph_segment_parse().
|
|
* Freed in avfilter_graph_segment_free().
|
|
*/
|
|
typedef struct AVFilterPadParams {
|
|
/**
|
|
* An av_malloc()'ed string containing the pad label.
|
|
*
|
|
* May be av_free()'d and set to NULL by the caller, in which case this pad
|
|
* will be treated as unlabeled for linking.
|
|
* May also be replaced by another av_malloc()'ed string.
|
|
*/
|
|
char *label;
|
|
} AVFilterPadParams;
|
|
|
|
/**
|
|
* Parameters describing a filter to be created in a filtergraph.
|
|
*
|
|
* Created as a child of AVFilterGraphSegment by avfilter_graph_segment_parse().
|
|
* Freed in avfilter_graph_segment_free().
|
|
*/
|
|
typedef struct AVFilterParams {
|
|
/**
|
|
* The filter context.
|
|
*
|
|
* Created by avfilter_graph_segment_create_filters() based on
|
|
* AVFilterParams.filter_name and instance_name.
|
|
*
|
|
* Callers may also create the filter context manually, then they should
|
|
* av_free() filter_name and set it to NULL. Such AVFilterParams instances
|
|
* are then skipped by avfilter_graph_segment_create_filters().
|
|
*/
|
|
AVFilterContext *filter;
|
|
|
|
/**
|
|
* Name of the AVFilter to be used.
|
|
*
|
|
* An av_malloc()'ed string, set by avfilter_graph_segment_parse(). Will be
|
|
* passed to avfilter_get_by_name() by
|
|
* avfilter_graph_segment_create_filters().
|
|
*
|
|
* Callers may av_free() this string and replace it with another one or
|
|
* NULL. If the caller creates the filter instance manually, this string
|
|
* MUST be set to NULL.
|
|
*
|
|
* When both AVFilterParams.filter an AVFilterParams.filter_name are NULL,
|
|
* this AVFilterParams instance is skipped by avfilter_graph_segment_*()
|
|
* functions.
|
|
*/
|
|
char *filter_name;
|
|
/**
|
|
* Name to be used for this filter instance.
|
|
*
|
|
* An av_malloc()'ed string, may be set by avfilter_graph_segment_parse() or
|
|
* left NULL. The caller may av_free() this string and replace with another
|
|
* one or NULL.
|
|
*
|
|
* Will be used by avfilter_graph_segment_create_filters() - passed as the
|
|
* third argument to avfilter_graph_alloc_filter(), then freed and set to
|
|
* NULL.
|
|
*/
|
|
char *instance_name;
|
|
|
|
/**
|
|
* Options to be apllied to the filter.
|
|
*
|
|
* Filled by avfilter_graph_segment_parse(). Afterwards may be freely
|
|
* modified by the caller.
|
|
*
|
|
* Will be applied to the filter by avfilter_graph_segment_apply_opts()
|
|
* with an equivalent of av_opt_set_dict2(filter, &opts, AV_OPT_SEARCH_CHILDREN),
|
|
* i.e. any unapplied options will be left in this dictionary.
|
|
*/
|
|
AVDictionary *opts;
|
|
|
|
AVFilterPadParams **inputs;
|
|
unsigned nb_inputs;
|
|
|
|
AVFilterPadParams **outputs;
|
|
unsigned nb_outputs;
|
|
} AVFilterParams;
|
|
|
|
/**
|
|
* A filterchain is a list of filter specifications.
|
|
*
|
|
* Created as a child of AVFilterGraphSegment by avfilter_graph_segment_parse().
|
|
* Freed in avfilter_graph_segment_free().
|
|
*/
|
|
typedef struct AVFilterChain {
|
|
AVFilterParams **filters;
|
|
size_t nb_filters;
|
|
} AVFilterChain;
|
|
|
|
/**
|
|
* A parsed representation of a filtergraph segment.
|
|
*
|
|
* A filtergraph segment is conceptually a list of filterchains, with some
|
|
* supplementary information (e.g. format conversion flags).
|
|
*
|
|
* Created by avfilter_graph_segment_parse(). Must be freed with
|
|
* avfilter_graph_segment_free().
|
|
*/
|
|
typedef struct AVFilterGraphSegment {
|
|
/**
|
|
* The filtergraph this segment is associated with.
|
|
* Set by avfilter_graph_segment_parse().
|
|
*/
|
|
AVFilterGraph *graph;
|
|
|
|
/**
|
|
* A list of filter chain contained in this segment.
|
|
* Set in avfilter_graph_segment_parse().
|
|
*/
|
|
AVFilterChain **chains;
|
|
size_t nb_chains;
|
|
|
|
/**
|
|
* A string containing a colon-separated list of key=value options applied
|
|
* to all scale filters in this segment.
|
|
*
|
|
* May be set by avfilter_graph_segment_parse().
|
|
* The caller may free this string with av_free() and replace it with a
|
|
* different av_malloc()'ed string.
|
|
*/
|
|
char *scale_sws_opts;
|
|
} AVFilterGraphSegment;
|
|
|
|
/**
|
|
* Parse a textual filtergraph description into an intermediate form.
|
|
*
|
|
* This intermediate representation is intended to be modified by the caller as
|
|
* described in the documentation of AVFilterGraphSegment and its children, and
|
|
* then applied to the graph either manually or with other
|
|
* avfilter_graph_segment_*() functions. See the documentation for
|
|
* avfilter_graph_segment_apply() for the canonical way to apply
|
|
* AVFilterGraphSegment.
|
|
*
|
|
* @param graph Filter graph the parsed segment is associated with. Will only be
|
|
* used for logging and similar auxiliary purposes. The graph will
|
|
* not be actually modified by this function - the parsing results
|
|
* are instead stored in seg for further processing.
|
|
* @param graph_str a string describing the filtergraph segment
|
|
* @param flags reserved for future use, caller must set to 0 for now
|
|
* @param seg A pointer to the newly-created AVFilterGraphSegment is written
|
|
* here on success. The graph segment is owned by the caller and must
|
|
* be freed with avfilter_graph_segment_free() before graph itself is
|
|
* freed.
|
|
*
|
|
* @retval "non-negative number" success
|
|
* @retval "negative error code" failure
|
|
*/
|
|
int avfilter_graph_segment_parse(AVFilterGraph *graph, const char *graph_str,
|
|
int flags, AVFilterGraphSegment **seg);
|
|
|
|
/**
|
|
* Create filters specified in a graph segment.
|
|
*
|
|
* Walk through the creation-pending AVFilterParams in the segment and create
|
|
* new filter instances for them.
|
|
* Creation-pending params are those where AVFilterParams.filter_name is
|
|
* non-NULL (and hence AVFilterParams.filter is NULL). All other AVFilterParams
|
|
* instances are ignored.
|
|
*
|
|
* For any filter created by this function, the corresponding
|
|
* AVFilterParams.filter is set to the newly-created filter context,
|
|
* AVFilterParams.filter_name and AVFilterParams.instance_name are freed and set
|
|
* to NULL.
|
|
*
|
|
* @param seg the filtergraph segment to process
|
|
* @param flags reserved for future use, caller must set to 0 for now
|
|
*
|
|
* @retval "non-negative number" Success, all creation-pending filters were
|
|
* successfully created
|
|
* @retval AVERROR_FILTER_NOT_FOUND some filter's name did not correspond to a
|
|
* known filter
|
|
* @retval "another negative error code" other failures
|
|
*
|
|
* @note Calling this function multiple times is safe, as it is idempotent.
|
|
*/
|
|
int avfilter_graph_segment_create_filters(AVFilterGraphSegment *seg, int flags);
|
|
|
|
/**
|
|
* Apply parsed options to filter instances in a graph segment.
|
|
*
|
|
* Walk through all filter instances in the graph segment that have option
|
|
* dictionaries associated with them and apply those options with
|
|
* av_opt_set_dict2(..., AV_OPT_SEARCH_CHILDREN). AVFilterParams.opts is
|
|
* replaced by the dictionary output by av_opt_set_dict2(), which should be
|
|
* empty (NULL) if all options were successfully applied.
|
|
*
|
|
* If any options could not be found, this function will continue processing all
|
|
* other filters and finally return AVERROR_OPTION_NOT_FOUND (unless another
|
|
* error happens). The calling program may then deal with unapplied options as
|
|
* it wishes.
|
|
*
|
|
* Any creation-pending filters (see avfilter_graph_segment_create_filters())
|
|
* present in the segment will cause this function to fail. AVFilterParams with
|
|
* no associated filter context are simply skipped.
|
|
*
|
|
* @param seg the filtergraph segment to process
|
|
* @param flags reserved for future use, caller must set to 0 for now
|
|
*
|
|
* @retval "non-negative number" Success, all options were successfully applied.
|
|
* @retval AVERROR_OPTION_NOT_FOUND some options were not found in a filter
|
|
* @retval "another negative error code" other failures
|
|
*
|
|
* @note Calling this function multiple times is safe, as it is idempotent.
|
|
*/
|
|
int avfilter_graph_segment_apply_opts(AVFilterGraphSegment *seg, int flags);
|
|
|
|
/**
|
|
* Initialize all filter instances in a graph segment.
|
|
*
|
|
* Walk through all filter instances in the graph segment and call
|
|
* avfilter_init_dict(..., NULL) on those that have not been initialized yet.
|
|
*
|
|
* Any creation-pending filters (see avfilter_graph_segment_create_filters())
|
|
* present in the segment will cause this function to fail. AVFilterParams with
|
|
* no associated filter context or whose filter context is already initialized,
|
|
* are simply skipped.
|
|
*
|
|
* @param seg the filtergraph segment to process
|
|
* @param flags reserved for future use, caller must set to 0 for now
|
|
*
|
|
* @retval "non-negative number" Success, all filter instances were successfully
|
|
* initialized
|
|
* @retval "negative error code" failure
|
|
*
|
|
* @note Calling this function multiple times is safe, as it is idempotent.
|
|
*/
|
|
int avfilter_graph_segment_init(AVFilterGraphSegment *seg, int flags);
|
|
|
|
/**
|
|
* Link filters in a graph segment.
|
|
*
|
|
* Walk through all filter instances in the graph segment and try to link all
|
|
* unlinked input and output pads. Any creation-pending filters (see
|
|
* avfilter_graph_segment_create_filters()) present in the segment will cause
|
|
* this function to fail. Disabled filters and already linked pads are skipped.
|
|
*
|
|
* Every filter output pad that has a corresponding AVFilterPadParams with a
|
|
* non-NULL label is
|
|
* - linked to the input with the matching label, if one exists;
|
|
* - exported in the outputs linked list otherwise, with the label preserved.
|
|
* Unlabeled outputs are
|
|
* - linked to the first unlinked unlabeled input in the next non-disabled
|
|
* filter in the chain, if one exists
|
|
* - exported in the ouputs linked list otherwise, with NULL label
|
|
*
|
|
* Similarly, unlinked input pads are exported in the inputs linked list.
|
|
*
|
|
* @param seg the filtergraph segment to process
|
|
* @param flags reserved for future use, caller must set to 0 for now
|
|
* @param[out] inputs a linked list of all free (unlinked) inputs of the
|
|
* filters in this graph segment 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
|
|
* filters in this graph segment will be returned here. It
|
|
* is to be freed by the caller using avfilter_inout_free().
|
|
*
|
|
* @retval "non-negative number" success
|
|
* @retval "negative error code" failure
|
|
*
|
|
* @note Calling this function multiple times is safe, as it is idempotent.
|
|
*/
|
|
int avfilter_graph_segment_link(AVFilterGraphSegment *seg, int flags,
|
|
AVFilterInOut **inputs,
|
|
AVFilterInOut **outputs);
|
|
|
|
/**
|
|
* Apply all filter/link descriptions from a graph segment to the associated filtergraph.
|
|
*
|
|
* This functions is currently equivalent to calling the following in sequence:
|
|
* - avfilter_graph_segment_create_filters();
|
|
* - avfilter_graph_segment_apply_opts();
|
|
* - avfilter_graph_segment_init();
|
|
* - avfilter_graph_segment_link();
|
|
* failing if any of them fails. This list may be extended in the future.
|
|
*
|
|
* Since the above functions are idempotent, the caller may call some of them
|
|
* manually, then do some custom processing on the filtergraph, then call this
|
|
* function to do the rest.
|
|
*
|
|
* @param seg the filtergraph segment to process
|
|
* @param flags reserved for future use, caller must set to 0 for now
|
|
* @param[out] inputs passed to avfilter_graph_segment_link()
|
|
* @param[out] outputs passed to avfilter_graph_segment_link()
|
|
*
|
|
* @retval "non-negative number" success
|
|
* @retval "negative error code" failure
|
|
*
|
|
* @note Calling this function multiple times is safe, as it is idempotent.
|
|
*/
|
|
int avfilter_graph_segment_apply(AVFilterGraphSegment *seg, int flags,
|
|
AVFilterInOut **inputs,
|
|
AVFilterInOut **outputs);
|
|
|
|
/**
|
|
* Free the provided AVFilterGraphSegment and everything associated with it.
|
|
*
|
|
* @param seg double pointer to the AVFilterGraphSegment to be freed. NULL will
|
|
* be written to this pointer on exit from this function.
|
|
*
|
|
* @note
|
|
* The filter contexts (AVFilterParams.filter) are owned by AVFilterGraph rather
|
|
* than AVFilterGraphSegment, so they are not freed.
|
|
*/
|
|
void avfilter_graph_segment_free(AVFilterGraphSegment **seg);
|
|
|
|
/**
|
|
* 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 */
|