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Delphi-OpenCV/source/ffmpeg/ffm.avfilter.pas
Laentir Valetov a016c463c5 Fixed unit names 
Signed-off-by: Laentir Valetov <laex@bk.ru>
2014-05-22 18:45:51 +04:00

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(*
* filter layer
* Copyright (c) 2007 Bobby Bingham
*
* This file is part of ffm.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*)
unit ffm.avfilter;
{$i ffmpeg.inc}
interface
uses
ffm.log, ffm.dict, ffm.rational, ffm.avutil, ffm.frame;
(*
* Return the LIBAVFILTER_VERSION_INT constant.
*)
// unsigned avfilter_version(void);
(*
* Return the libavfilter build-time configuration.
*)
// const char *avfilter_configuration(void);
(*
* Return the libavfilter license.
*)
// const char *avfilter_license(void);
{$IFDEF FF_API_AVFILTERBUFFER}
const
AV_PERM_READ = $01;
/// < can read from the buffer
AV_PERM_WRITE = $02;
/// < can write to the buffer
AV_PERM_PRESERVE = $04;
/// < nobody else can overwrite the buffer
AV_PERM_REUSE = $08;
/// < can output the buffer multiple times, with the same contents each time
AV_PERM_REUSE2 = $10;
/// < can output the buffer multiple times, modified each time
AV_PERM_NEG_LINESIZES = $20;
/// < the buffer requested can have negative linesizes
AV_PERM_ALIGN = $40;
/// < the buffer must be aligned
AVFILTER_ALIGN = 16; // not part of ABI
{$ENDIF}
Type
ppByte = ^pByte;
pAVFilterLink = ^TAVFilterLink;
ppAVFilterLink = ^pAVFilterLink;
pAVFilterPad = ^TAVFilterPad;
TAVFilterPad = record
end;
pAVFilterFormats = ^TAVFilterFormats;
TAVFilterFormats = record
end;
{$IFDEF FF_API_AVFILTERBUFFER}
(*
* A reference-counted buffer data type used by the filter system. Filters
* should not store pointers to this structure directly, but instead use the
* AVFilterBufferRef structure below.
*)
pAVFilterBuffer = ^TAVFilterBuffer;
TAVFilterBuffer = record
data: array [0 .. 7] of pByte;
/// < buffer data for each plane/channel
(*
* pointers to the data planes/channels.
*
* For video, this should simply point to data[].
*
* For planar audio, each channel has a separate data pointer, and
* linesize[0] contains the size of each channel buffer.
* For {packed} audio, there is just one data pointer, and linesize[0]
* contains the total size of the buffer for all channels.
*
* Note: Both data and extended_data will always be set, but for planar
* audio with more channels that can fit in data, extended_data must be used
* in order to access all channels.
*)
extended_data: ppByte;
linesize: array [0 .. 7] of integer;
/// < number of bytes per line
(* private data to be used by a custom free function *)
priv: pointer;
(*
* A pointer to the function to deallocate this buffer if the default
* function is not sufficient. This could, for example, add the memory
* back into a memory pool to be reused later without the overhead of
* reallocating it from scratch.
*)
// void (*free)(struct AVFilterBuffer *buf);
free: procedure(buf: pAVFilterBuffer); cdecl;
format: integer;
/// < media format
w, h: integer;
/// < width and height of the allocated buffer
refcount: cardinal;
/// < number of references to this buffer
end;
(*
* Audio specific properties in a reference to an AVFilterBuffer. Since
* AVFilterBufferRef is common to different media formats, audio specific
* per reference properties must be separated out.
*)
pAVFilterBufferRefAudioProps = ^TAVFilterBufferRefAudioProps;
TAVFilterBufferRefAudioProps = record
channel_layout: uint64;
/// < channel layout of audio buffer
nb_samples: integer;
/// < number of audio samples per channel
sample_rate: integer;
/// < audio buffer sample rate
channels: integer;
/// < number of channels (do not access directly)
end;
(*
* Video specific properties in a reference to an AVFilterBuffer. Since
* AVFilterBufferRef is common to different media formats, video specific
* per reference properties must be separated out.
*)
pAVFilterBufferRefVideoProps = ^TAVFilterBufferRefVideoProps;
TAVFilterBufferRefVideoProps = record
w: integer;
/// < image width
h: integer;
/// < image height
sample_aspect_ratio: TAVRational;
/// < sample aspect ratio
interlaced: integer;
/// < is frame interlaced
top_field_first: integer;
/// < field order
pict_type: TAVPictureType;
/// < picture type of the frame
key_frame: integer;
/// < 1 -> keyframe, 0-> not
qp_table_linesize: integer;
/// < qp_table stride
qp_table_size: integer;
/// < qp_table size
qp_table: pByte;
/// < array of Quantization Parameters
end;
(*
* A reference to an AVFilterBuffer. Since filters can manipulate the origin of
* a buffer to, for example, crop image without any memcpy, the buffer origin
* and dimensions are per-reference properties. Linesize is also useful for
* image flipping, frame to field filters, etc, and so is also per-reference.
*
* TODO: add anything necessary for frame reordering
*)
pAVFilterBufferRef = ^TAVFilterBufferRef;
TAVFilterBufferRef = record
buf: pAVFilterBuffer;
/// < the buffer that this is a reference to
data: array [0 .. 7] of pByte;
/// < picture/audio data for each plane
(*
* pointers to the data planes/channels.
*
* For video, this should simply point to data[].
*
* For planar audio, each channel has a separate data pointer, and
* linesize[0] contains the size of each channel buffer.
* For {packed} audio, there is just one data pointer, and linesize[0]
* contains the total size of the buffer for all channels.
*
* Note: Both data and extended_data will always be set, but for planar
* audio with more channels that can fit in data, extended_data must be used
* in order to access all channels.
*)
extended_data: ppByte;
linesize: array [0 .. 7] of integer;
/// < number of bytes per line
video: pAVFilterBufferRefVideoProps;
/// < video buffer specific properties
audio: pAVFilterBufferRefAudioProps;
/// < audio buffer specific properties
(*
* presentation timestamp. The time unit may change during
* filtering, as it is specified in the link and the filter code
* may need to rescale the PTS accordingly.
*)
pts: int64;
pos: int64;
/// < byte position in stream, -1 if unknown
format: integer;
/// < media format
perms: integer;
/// < permissions, see the AV_PERM_* flags
_type: TAVMediaType;
/// < media type of buffer data
metadata: pAVDictionary;
/// < dictionary containing metadata key=value tags
end;
//
// (*
// * Copy properties of src to dst, without copying the actual data
// *)
// attribute_deprecated void avfilter_copy_buffer_ref_props(AVFilterBufferRef * dst, AVFilterBufferRef * src);
//
// (*
// * Add a new reference to a buffer.
// *
// * @param ref an existing reference to the buffer
// * @param pmask a bitmask containing the allowable permissions in the new
// * reference
// * @return a new reference to the buffer with the same properties as the
// * old, excluding any permissions denied by pmask
// *)
// attribute_deprecated AVFilterBufferRef * avfilter_ref_buffer(AVFilterBufferRef * ref, int pmask);
//
// (*
// * Remove a reference to a buffer. If this is the last reference to the
// * buffer, the buffer itself is also automatically freed.
// *
// * @param ref reference to the buffer, may be NULL
// *
// * @note it is recommended to use avfilter_unref_bufferp() instead of this
// * function
// *)
// attribute_deprecated void avfilter_unref_buffer(AVFilterBufferRef * ref);
//
// (*
// * Remove a reference to a buffer and set the pointer to NULL.
// * If this is the last reference to the buffer, the buffer itself
// * is also automatically freed.
// *
// * @param ref pointer to the buffer reference
// *)
// attribute_deprecated void avfilter_unref_bufferp(AVFilterBufferRef * * ref);
{$ENDIF}
//
// (*
// * Get the number of channels of a buffer reference.
// *)
// attribute_deprecated int avfilter_ref_get_channels(AVFilterBufferRef * ref);
//
// #
// if FF_API_AVFILTERPAD_PUBLIC
// (*
// * A filter pad used for either input or output.
// *
// * See doc/filter_design.txt for details on how to implement the methods.
// *
// * @warning this struct might be removed from public API.
// * users should call avfilter_pad_get_name() and avfilter_pad_get_type()
// * to access the name and type fields; there should be no need to access
// * any other fields from outside of libavfilter.
// *)
// struct AVFilterPad {
// (*
// * Pad name. The name is unique among inputs and among outputs, but an
// * input may have the same name as an output. This may be NULL if this
// * pad has no need to ever be referenced by name.
// *)
// const char *name;
//
// (*
// * AVFilterPad type.
// *)
// enum AVMediaType type;
//
// (*
// * Input pads:
// * Minimum required permissions on incoming buffers. Any buffer with
// * insufficient permissions will be automatically copied by the filter
// * system to a new buffer which provides the needed access permissions.
// *
// * Output pads:
// * Guaranteed permissions on outgoing buffers. Any buffer pushed on the
// * link must have at least these permissions; this fact is checked by
// * asserts. It can be used to optimize buffer allocation.
// *)
// attribute_deprecated int min_perms;
//
// (*
// * Input pads:
// * Permissions which are not accepted on incoming buffers. Any buffer
// * which has any of these permissions set will be automatically copied
// * by the filter system to a new buffer which does not have those
// * permissions. This can be used to easily disallow buffers with
// * AV_PERM_REUSE.
// *
// * Output pads:
// * Permissions which are automatically removed on outgoing buffers. It
// * can be used to optimize buffer allocation.
// *)
// attribute_deprecated int rej_perms;
//
// (*
// * @deprecated unused
// *)
// int (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
//
// (*
// * Callback function to get a video buffer. If NULL, the filter system will
// * use ff_default_get_video_buffer().
// *
// * Input video pads only.
// *)
// AVFrame *(*get_video_buffer)(AVFilterLink *link, int w, int h);
//
// (*
// * Callback function to get an audio buffer. If NULL, the filter system will
// * use ff_default_get_audio_buffer().
// *
// * Input audio pads only.
// *)
// AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);
//
// (*
// * @deprecated unused
// *)
// int (*end_frame)(AVFilterLink *link);
//
// (*
// * @deprecated unused
// *)
// int (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
//
// (*
// * Filtering callback. This is where a filter receives a frame with
// * audio/video data and should do its processing.
// *
// * Input pads only.
// *
// * @return >= 0 on success, a negative AVERROR on error. This function
// * must ensure that frame is properly unreferenced on error if it
// * hasn't been passed on to another filter.
// *)
// int (*filter_frame)(AVFilterLink *link, AVFrame *frame);
//
// (*
// * Frame poll callback. This returns the number of immediately available
// * samples. It should return a positive value if the next request_frame()
// * is guaranteed to return one frame (with no delay).
// *
// * Defaults to just calling the source poll_frame() method.
// *
// * Output pads only.
// *)
// int (*poll_frame)(AVFilterLink *link);
//
// (*
// * Frame request callback. A call to this should result in at least one
// * frame being output over the given link. This should return zero on
// * success, and another value on error.
// * See ff_request_frame() for the error codes with a specific
// * meaning.
// *
// * Output pads only.
// *)
// int (*request_frame)(AVFilterLink *link);
//
// (*
// * Link configuration callback.
// *
// * For output pads, this should set the following link properties:
// * video: width, height, sample_aspect_ratio, time_base
// * audio: sample_rate.
// *
// * This should NOT set properties such as format, channel_layout, etc which
// * are negotiated between filters by the filter system using the
// * query_formats() callback before this function is called.
// *
// * For input pads, this should check the properties of the link, and update
// * the filter's internal state as necessary.
// *
// * For both input and output pads, this should return zero on success,
// * and another value on error.
// *)
// int (*config_props)(AVFilterLink *link);
//
// (*
// * The filter expects a fifo to be inserted on its input link,
// * typically because it has a delay.
// *
// * input pads only.
// *)
// int needs_fifo;
//
// int needs_writable;
// };
// # endif
//
// (*
// * Get the number of elements in a NULL-terminated array of AVFilterPads (e.g.
// * AVFilter.inputs/outputs).
// *)
// int avfilter_pad_count(const AVFilterPad * pads);
//
// (*
// * Get the name of an AVFilterPad.
// *
// * @param pads an array of AVFilterPads
// * @param pad_idx index of the pad in the array it; is the caller's
// * responsibility to ensure the index is valid
// *
// * @return name of the pad_idx'th pad in pads
// *)
// const
// char * avfilter_pad_get_name(const AVFilterPad * pads, int pad_idx);
//
// (*
// * Get the type of an AVFilterPad.
// *
// * @param pads an array of AVFilterPads
// * @param pad_idx index of the pad in the array; it is the caller's
// * responsibility to ensure the index is valid
// *
// * @return type of the pad_idx'th pad in pads
// *)
// enum AVMediaType avfilter_pad_get_type(const AVFilterPad * pads, int pad_idx);
//
// (*
// * The number of the filter inputs is not determined just by AVFilter.inputs.
// * The filter might add additional inputs during initialization depending on the
// * options supplied to it.
// *)
// # define AVFILTER_FLAG_DYNAMIC_INPUTS(1 << 0)
// (*
// * The number of the filter outputs is not determined just by AVFilter.outputs.
// * The filter might add additional outputs during initialization depending on
// * the options supplied to it.
// *)
// # define AVFILTER_FLAG_DYNAMIC_OUTPUTS(1 << 1)
// (*
// * The filter supports multithreading by splitting frames into multiple parts
// * and processing them concurrently.
// *)
// # define AVFILTER_FLAG_SLICE_THREADS(1 << 2)
// (*
// * Some filters support a generic "enable" expression option that can be used
// * to enable or disable a filter in the timeline. Filters supporting this
// * option have this flag set. When the enable expression is false, the default
// * no-op filter_frame() function is called in place of the filter_frame()
// * callback defined on each input pad, thus the frame is passed unchanged to
// * the next filters.
// *)
// # define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC(1 << 16)
// (*
// * Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will
// * have its filter_frame() callback(s) called as usual even when the enable
// * expression is false. The filter will disable filtering within the
// * filter_frame() callback(s) itself, for example executing code depending on
// * the AVFilterContext->is_disabled value.
// *)
// # define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL(1 << 17)
// (*
// * Handy mask to test whether the filter supports or no the timeline feature
// * (internally or generically).
// *)
// # define AVFILTER_FLAG_SUPPORT_TIMELINE(AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL)
(*
* Filter definition. This defines the pads a filter contains, and all the
* callback functions used to interact with the filter.
*)
pAVFilterContext = ^TAVFilterContext;
ppAVFilterContext = ^pAVFilterContext;
pavfilter = ^Tavfilter;
Tavfilter = record
(*
* Filter name. Must be non-NULL and unique among filters.
*)
name: pAnsiChar;
(*
* A description of the filter. May be NULL.
*
* You should use the NULL_IF_CONFIG_SMALL() macro to define it.
*)
description: pAnsiChar;
(*
* List of inputs, terminated by a zeroed element.
*
* NULL if there are no (static) inputs. Instances of filters with
* AVFILTER_FLAG_DYNAMIC_INPUTS set may have more inputs than present in
* this list.
*)
inputs: pAVFilterPad;
(*
* List of outputs, terminated by a zeroed element.
*
* NULL if there are no (static) outputs. Instances of filters with
* AVFILTER_FLAG_DYNAMIC_OUTPUTS set may have more outputs than present in
* this list.
*)
outputs: pAVFilterPad;
(*
* A class for the private data, used to declare filter private AVOptions.
* This field is NULL for filters that do not declare any options.
*
* If this field is non-NULL, the first member of the filter private data
* must be a pointer to AVClass, which will be set by libavfilter generic
* code to this class.
*)
priv_class: pAVClass;
(*
* A combination of AVFILTER_FLAG_*
*)
flags: integer;
(* ***************************************************************
* All fields below this line are not part of the public API. They
* may not be used outside of libavfilter and can be changed and
* removed at will.
* New public fields should be added right above.
*****************************************************************
*)
(*
* Filter initialization function.
*
* This callback will be called only once during the filter lifetime, after
* all the options have been set, but before links between filters are
* established and format negotiation is done.
*
* Basic filter initialization should be done here. Filters with dynamic
* inputs and/or outputs should create those inputs/outputs here based on
* provided options. No more changes to this filter's inputs/outputs can be
* done after this callback.
*
* This callback must not assume that the filter links exist or frame
* parameters are known.
*
* @ref AVFilter.uninit "uninit" is guaranteed to be called even if
* initialization fails, so this callback does not have to clean up on
* failure.
*
* @return 0 on success, a negative AVERROR on failure
*)
// int (*init)(AVFilterContext *ctx);
init:
function(ctx: pAVFilterContext): integer; cdecl;
(*
* Should be set instead of @ref AVFilter.init "init" by the filters that
* want to pass a dictionary of AVOptions to nested contexts that are
* allocated during init.
*
* On return, the options dict should be freed and replaced with one that
* contains all the options which could not be processed by this filter (or
* with NULL if all the options were processed).
*
* Otherwise the semantics is the same as for @ref AVFilter.init "init".
*)
// int (*init_dict)(AVFilterContext *ctx, AVDictionary **options);
init_dict: function(ctx: pAVFilterContext; options: ppAVDictionary): integer; cdecl;
(*
* Filter uninitialization function.
*
* Called only once right before the filter is freed. Should deallocate any
* memory held by the filter, release any buffer references, etc. It does
* not need to deallocate the AVFilterContext.priv memory itself.
*
* This callback may be called even if @ref AVFilter.init "init" was not
* called or failed, so it must be prepared to handle such a situation.
*)
// void (*uninit)(AVFilterContext *ctx);
uninit: procedure(ctx: pAVFilterContext); cdecl;
(*
* Query formats supported by the filter on its inputs and outputs.
*
* This callback is called after the filter is initialized (so the inputs
* and outputs are fixed), shortly before the format negotiation. This
* callback may be called more than once.
*
* This callback must set AVFilterLink.out_formats on every input link and
* AVFilterLink.in_formats on every output link to a list of pixel/sample
* formats that the filter supports on that link. For audio links, this
* filter must also set @ref AVFilterLink.in_samplerates "in_samplerates" /
* @ref AVFilterLink.out_samplerates "out_samplerates" and
* @ref AVFilterLink.in_channel_layouts "in_channel_layouts" /
* @ref AVFilterLink.out_channel_layouts "out_channel_layouts" analogously.
*
* This callback may be NULL for filters with one input, in which case
* libavfilter assumes that it supports all input formats and preserves
* them on output.
*
* @return zero on success, a negative value corresponding to an
* AVERROR code otherwise
*)
// int (*query_formats)(AVFilterContext *);
query_formats: function(fc: pAVFilterContext): integer; cdecl;
priv_size: integer;
/// < size of private data to allocate for the filter
(*
* Used by the filter registration system. Must not be touched by any other
* code.
*)
next: pavfilter;
(*
* Make the filter instance process a command.
*
* @param cmd the command to process, for handling simplicity all commands must be alphanumeric only
* @param arg the argument for the command
* @param res a buffer with size res_size where the filter(s) can return a response. This must not change when the command is not supported.
* @param flags if AVFILTER_CMD_FLAG_FAST is set and the command would be
* time consuming then a filter should treat it like an unsupported command
*
* @returns >=0 on success otherwise an error code.
* AVERROR(ENOSYS) on unsupported commands
*)
// int (*process_command)(AVFilterContext *, const char *cmd, const char *arg, char *res, int res_len, int flags);
process_command: function(fc: pAVFilterContext; const cmd: pAnsiChar; const arg: pAnsiChar; res: pAnsiChar; res_len: integer;
flags: integer): integer; cdecl;
(*
* Filter initialization function, alternative to the init()
* callback. Args contains the user-supplied parameters, opaque is
* used for providing binary data.
*)
// int (*init_opaque)(AVFilterContext *ctx, void *opaque);
init_opaque: function(ctx: pAVFilterContext; opaque: pointer): integer; cdecl;
end;
(*
* Process multiple parts of the frame concurrently.
*)
// # define AVFILTER_THREAD_SLICE(1 << 0)
pAVFilterInternal = ^TAVFilterInternal;
TAVFilterInternal = record
end;
pAVFilterCommand = ^TAVFilterCommand;
TAVFilterCommand = record
end;
pAVFilterGraph = ^TAVFilterGraph;
(* An instance of a filter *)
TAVFilterContext = record
av_class: pAVClass;
/// < needed for av_log() and filters common options
filter: pavfilter;
/// < the AVFilter of which this is an instance
name: pAnsiChar;
/// < name of this filter instance
input_pads: pAVFilterPad;
/// < array of input pads
inputs: ppAVFilterLink;
/// < array of pointers to input links
{$IFDEF FF_API_FOO_COUNT}
// attribute_deprecated
input_count: cardinal;
/// < @deprecated use nb_inputs
{$ENDIF}
nb_inputs: cardinal;
/// < number of input pads
output_pads: pAVFilterPad;
/// < array of output pads
outputs: ppAVFilterLink;
/// < array of pointers to output links
{$IFDEF FF_API_FOO_COUNT}
// attribute_deprecated
output_count: cardinal;
/// < @deprecated use nb_outputs
{$ENDIF}
nb_outputs: cardinal;
/// < number of output pads
priv: pointer;
/// < private data for use by the filter
graph: pAVFilterGraph;
/// < filtergraph this filter belongs to
(*
* Type of multithreading being allowed/used. A combination of
* AVFILTER_THREAD_* flags.
*
* May be set by the caller before initializing the filter to forbid some
* or all kinds of multithreading for this filter. The default is allowing
* everything.
*
* When the filter is initialized, this field is combined using bit AND with
* AVFilterGraph.thread_type to get the final mask used for determining
* allowed threading types. I.e. a threading type needs to be set in both
* to be allowed.
*
* After the filter is initialzed, libavfilter sets this field to the
* threading type that is actually used (0 for no multithreading).
*)
thread_type: integer;
(*
* An opaque struct for libavfilter internal use.
*)
internal: pAVFilterInternal;
command_queue: pAVFilterCommand;
enable_str: pAnsiChar;
/// < enable expression string
enable: pointer;
/// < parsed expression (AVExpr*)
var_values: pDouble;
/// < variable values for the enable expression
is_disabled: integer;
/// < the enabled state from the last expression evaluation
end;
(*
* 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.
*)
Tinit_state = ( //
AVLINK_UNINIT = 0,
/// < not started
AVLINK_STARTINIT,
/// < started, but incomplete
AVLINK_INIT
/// < complete
);
pAVFilterChannelLayouts = ^TAVFilterChannelLayouts;
TAVFilterChannelLayouts = record
end;
pAVFilterPool = ^TAVFilterPool;
TAVFilterPool = record
end;
TAVFilterLink = record
src: pAVFilterContext;
/// < source filter
srcpad: pAVFilterPad;
/// < output pad on the source filter
dst: pAVFilterContext;
/// < dest filter
dstpad: pAVFilterPad;
/// < input pad on the dest filter
_type: TAVMediaType;
/// < filter media type
(* These parameters apply only to video *)
w: integer;
/// < agreed upon image width
h: integer;
/// < agreed upon image height
sample_aspect_ratio: TAVRational;
/// < agreed upon sample aspect ratio
(* These parameters apply only to audio *)
channel_layout: uint64;
/// < channel layout of current buffer (see libavutil/channel_layout.h)
sample_rate: integer;
/// < samples per second
format: integer;
/// < agreed upon media format
(*
* Define the time base used by the PTS of the frames/samples
* which will pass through this link.
* During the configuration stage, each filter is supposed to
* change only the output timebase, while the timebase of the
* input link is assumed to be an unchangeable property.
*)
time_base: TAVRational;
(* ***************************************************************
* All fields below this line are not part of the public API. They
* may not be used outside of libavfilter and can be changed and
* removed at will.
* New public fields should be added right above.
*****************************************************************
*)
(*
* Lists of formats and channel layouts supported by the input and output
* filters respectively. These lists are used for negotiating the format
* to actually be used, which will be loaded into the format and
* channel_layout members, above, when chosen.
*
*)
in_formats: pAVFilterFormats;
out_formats: pAVFilterFormats;
(*
* Lists of channel layouts and sample rates used for automatic
* negotiation.
*)
in_samplerates: pAVFilterFormats;
out_samplerates: pAVFilterFormats;
in_channel_layouts: pAVFilterChannelLayouts;
out_channel_layouts: pAVFilterChannelLayouts;
(*
* Audio only, the destination filter sets this to a non-zero value to
* request that buffers with the given number of samples should be sent to
* it. AVFilterPad.needs_fifo must also be set on the corresponding input
* pad.
* Last buffer before EOF will be padded with silence.
*)
request_samples: integer;
(* stage of the initialization of the link properties (dimensions, etc) *)
// enum {
// AVLINK_UNINIT = 0, ///< not started
// AVLINK_STARTINIT, ///< started, but incomplete
// AVLINK_INIT ///< complete
// } init_state;
init_state: Tinit_state;
pool: pAVFilterPool;
(*
* Graph the filter belongs to.
*)
graph: pAVFilterGraph;
(*
* Current timestamp of the link, as defined by the most recent
* frame(s), in AV_TIME_BASE units.
*)
current_pts: int64;
(*
* Index in the age array.
*)
age_index: integer;
(*
* Frame rate of the stream on the link, or 1/0 if unknown;
* if left to 0/0, will be automatically be copied from the first input
* of the source filter if it exists.
*
* Sources should set it to the best estimation of the real frame rate.
* Filters should update it if necessary depending on their function.
* Sinks can use it to set a default output frame rate.
* It is similar to the r_frame_rate field in AVStream.
*)
frame_rate: TAVRational;
(*
* Buffer partially filled with samples to achieve a fixed/minimum size.
*)
partial_buf: pAVFrame;
(*
* Size of the partial buffer to allocate.
* Must be between min_samples and max_samples.
*)
partial_buf_size: integer;
(*
* Minimum number of samples to filter at once. If filter_frame() is
* called with fewer samples, it will accumulate them in partial_buf.
* This field and the related ones must not be changed after filtering
* has started.
* If 0, all related fields are ignored.
*)
min_samples: integer;
(*
* Maximum number of samples to filter at once. If filter_frame() is
* called with more samples, it will split them.
*)
max_samples: integer;
(*
* The buffer reference currently being received across the link by the
* destination filter. This is used internally by the filter system to
* allow automatic copying of buffers which do not have sufficient
* permissions for the destination. This should not be accessed directly
* by the filters.
*)
cur_buf_copy: pAVFilterBufferRef;
(*
* True if the link is closed.
* If set, all attemps of start_frame, filter_frame or request_frame
* will fail with AVERROR_EOF, and if necessary the reference will be
* destroyed.
* If request_frame returns AVERROR_EOF, this flag is set on the
* corresponding link.
* It can be set also be set by either the source or the destination
* filter.
*)
closed: integer;
(*
* Number of channels.
*)
channels: integer;
(*
* True if a frame is being requested on the link.
* Used internally by the framework.
*)
frame_requested: cardinal;
(*
* Link processing flags.
*)
flags: cardinal;
(*
* Number of past frames sent through the link.
*)
frame_count: int64;
end;
// (*
// * Link two filters together.
// *
// * @param src the source filter
// * @param srcpad index of the output pad on the source filter
// * @param dst the destination filter
// * @param dstpad index of the input pad on the destination filter
// * @return zero on success
// *)
// int avfilter_link(AVFilterContext * src, unsigned srcpad, AVFilterContext * dst, unsigned dstpad);
//
// (*
// * Free the link in *link, and set its pointer to NULL.
// *)
// void avfilter_link_free(AVFilterLink * * link);
//
// (*
// * Get the number of channels of a link.
// *)
// int avfilter_link_get_channels(AVFilterLink * link);
//
// (*
// * Set the closed field of a link.
// *)
// void avfilter_link_set_closed(AVFilterLink * link, int closed);
//
// (*
// * Negotiate the media format, dimensions, etc of all inputs to a filter.
// *
// * @param filter the filter to negotiate the properties for its inputs
// * @return zero on successful negotiation
// *)
// int avfilter_config_links(AVFilterContext * filter);
//
// #
// if FF_API_AVFILTERBUFFER
// (*
// * Create a buffer reference wrapped around an already allocated image
// * buffer.
// *
// * @param data pointers to the planes of the image to reference
// * @param linesize linesizes for the planes of the image to reference
// * @param perms the required access permissions
// * @param w the width of the image specified by the data and linesize arrays
// * @param h the height of the image specified by the data and linesize arrays
// * @param format the pixel format of the image specified by the data and linesize arrays
// *)
// attribute_deprecated AVFilterBufferRef * avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4],
// int perms, int w, int h, enum AVPixelFormat format);
//
// (*
// * Create an audio buffer reference wrapped around an already
// * allocated samples buffer.
// *
// * See avfilter_get_audio_buffer_ref_from_arrays_channels() for a version
// * that can handle unknown channel layouts.
// *
// * @param data pointers to the samples plane buffers
// * @param linesize linesize for the samples plane buffers
// * @param perms the required access permissions
// * @param nb_samples number of samples per channel
// * @param sample_fmt the format of each sample in the buffer to allocate
// * @param channel_layout the channel layout of the buffer
// *)
// attribute_deprecated AVFilterBufferRef * avfilter_get_audio_buffer_ref_from_arrays(uint8_t * * data, int linesize, int perms,
// int nb_samples, enum AVSampleFormat sample_fmt, uint64_t channel_layout);
// (*
// * Create an audio buffer reference wrapped around an already
// * allocated samples buffer.
// *
// * @param data pointers to the samples plane buffers
// * @param linesize linesize for the samples plane buffers
// * @param perms the required access permissions
// * @param nb_samples number of samples per channel
// * @param sample_fmt the format of each sample in the buffer to allocate
// * @param channels the number of channels of the buffer
// * @param channel_layout the channel layout of the buffer,
// * must be either 0 or consistent with channels
// *)
// attribute_deprecated AVFilterBufferRef * avfilter_get_audio_buffer_ref_from_arrays_channels(uint8_t * * data, int linesize, int perms,
// int nb_samples, enum AVSampleFormat sample_fmt, int channels, uint64_t channel_layout);
//
// # 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);
// #
// if FF_API_OLD_FILTER_REGISTER
// (* Uninitialize the filter system. Unregister all filters. *)
// attribute_deprecated void avfilter_uninit(void);
// # endif
//
// (*
// * Register a filter. This is only needed if you plan to use
// * avfilter_get_by_name later to lookup the AVFilter structure by name. A
// * filter can still by instantiated with avfilter_graph_alloc_filter even if it
// * is not registered.
// *
// * @param filter the filter to register
// * @return 0 if the registration was successful, a negative value
// * otherwise
// *)
// int avfilter_register(avfilter * filter);
// (*
// * Iterate over all registered filters.
// * @return If prev is non-NULL, next registered filter after prev or NULL if
// * prev is the last filter. If prev is NULL, return the first registered filter.
// *)
// const
// avfilter * avfilter_next(const avfilter * prev);
//
// #
// if FF_API_OLD_FILTER_REGISTER
// (*
// * If filter is NULL, returns a pointer to the first registered filter pointer,
// * if filter is non-NULL, returns the next pointer after filter.
// * If the returned pointer points to NULL, the last registered filter
// * was already reached.
// * @deprecated use avfilter_next()
// *)
// attribute_deprecated avfilter * * av_filter_next(avfilter * * filter);
// # endif
//
// #
// if FF_API_AVFILTER_OPEN
// (*
// * Create a filter instance.
// *
// * @param filter_ctx put here a pointer to the created filter context
// * on success, NULL on failure
// * @param filter the filter to create an instance of
// * @param inst_name Name to give to the new instance. Can be NULL for none.
// * @return >= 0 in case of success, a negative error code otherwise
// * @deprecated use avfilter_graph_alloc_filter() instead
// *)
// attribute_deprecated int avfilter_open(AVFilterContext * * filter_ctx, avfilter * filter, const char * inst_name);
// # endif
//
// #
// if FF_API_AVFILTER_INIT_FILTER
// (*
// * Initialize a filter.
// *
// * @param filter the filter to initialize
// * @param args A string of parameters to use when initializing the filter.
// * The format and meaning of this string varies by filter.
// * @param opaque Any extra non-string data needed by the filter. The meaning
// * of this parameter varies by filter.
// * @return zero on success
// *)
// attribute_deprecated int avfilter_init_filter(AVFilterContext * filter, const char * args, void * opaque);
// # endif
//
// (*
// * Initialize a filter with the supplied parameters.
// *
// * @param ctx uninitialized filter context to initialize
// * @param args Options to initialize the filter with. This must be a
// * ':'-separated list of options in the 'key=value' form.
// * May be NULL if the options have been set directly using the
// * AVOptions API or there are no options that need to be set.
// * @return 0 on success, a negative AVERROR on failure
// *)
// int avfilter_init_str(AVFilterContext * ctx, const char * args);
//
// (*
// * Initialize a filter with the supplied dictionary of options.
// *
// * @param ctx uninitialized filter context to initialize
// * @param options An AVDictionary filled with options for this filter. On
// * return this parameter will be destroyed and replaced with
// * a dict containing options that were not found. This dictionary
// * must be freed by the caller.
// * May be NULL, then this function is equivalent to
// * avfilter_init_str() with the second parameter set to NULL.
// * @return 0 on success, a negative AVERROR on failure
// *
// * @note This function and avfilter_init_str() do essentially the same thing,
// * the difference is in manner in which the options are passed. It is up to the
// * calling code to choose whichever is more preferable. The two functions also
// * behave differently when some of the provided options are not declared as
// * supported by the filter. In such a case, avfilter_init_str() will fail, but
// * this function will leave those extra options in the options AVDictionary and
// * continue as usual.
// *)
// int avfilter_init_dict(AVFilterContext * ctx, AVDictionary * * options);
//
// (*
// * Free a filter context. This will also remove the filter from its
// * filtergraph's list of filters.
// *
// * @param filter the filter to free
// *)
// void avfilter_free(AVFilterContext * filter);
//
// (*
// * Insert a filter in the middle of an existing link.
// *
// * @param link the link into which the filter should be inserted
// * @param filt the filter to be inserted
// * @param filt_srcpad_idx the input pad on the filter to connect
// * @param filt_dstpad_idx the output pad on the filter to connect
// * @return zero on success
// *)
// int avfilter_insert_filter(AVFilterLink * link, AVFilterContext * filt, unsigned filt_srcpad_idx, unsigned filt_dstpad_idx);
//
// #
// if FF_API_AVFILTERBUFFER
// (*
// * Copy the frame properties of src to dst, without copying the actual
// * image data.
// *
// * @return 0 on success, a negative number on error.
// *)
// attribute_deprecated int avfilter_copy_frame_props(AVFilterBufferRef * dst, const AVFrame * src);
//
// (*
// * Copy the frame properties and data pointers of src to dst, without copying
// * the actual data.
// *
// * @return 0 on success, a negative number on error.
// *)
// attribute_deprecated int avfilter_copy_buf_props(AVFrame * dst, const AVFilterBufferRef * src);
// # endif
//
// (*
// * @return AVClass for AVFilterContext.
// *
// * @see av_opt_find().
// *)
// const
// AVClass * avfilter_get_class(void);
pAVFilterGraphInternal = ^TAVFilterGraphInternal;
TAVFilterGraphInternal = record
end;
//
// (*
// * 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);
Tavfilter_action_func = function(ctx: pAVFilterContext; arg: pointer; jobnr: integer; nb_jobs: integer): integer; cdecl;
// (*
// * 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);
Tavfilter_execute_func = function(ctx: pAVFilterContext; func: Tavfilter_action_func; arg: pointer; var ret: integer; nb_jobs: integer)
: integer; cdecl;
TAVFilterGraph = record
av_class: pAVClass;
{$IFDEF FF_API_FOO_COUNT}
// attribute_deprecated
// unsigned filter_count_unused;
filter_count_unused: cardinal;
{$ENDIF}
filters: PPMonitor;
{$IFNDEF FF_API_FOO_COUNT}
nb_filters: cardinal;
{$ENDIF}
scale_sws_opts: pAnsiChar;
/// < sws options to use for the auto-inserted scale filters
resample_lavr_opts: pAnsiChar;
/// < libavresample options to use for the auto-inserted resample filters
{$IFDEF FF_API_FOO_COUNT}
nb_filters: cardinal;
{$ENDIF}
(*
* 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.
*)
thread_type: integer;
(*
* 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.
*)
nb_threads: integer;
(*
* Opaque object for libavfilter internal use.
*)
internal: pAVFilterGraphInternal;
(*
* 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.
*)
opaque: pointer;
(*
* 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.
*)
execute: Tavfilter_execute_func;
aresample_swr_opts: pAnsiChar;
/// < swr options to use for the auto-inserted aresample filters, Access ONLY through AVOptions
(*
* Private fields
*
* The following fields are for internal use only.
* Their type, offset, number and semantic can change without notice.
*)
sink_links: ppAVFilterLink;
sink_links_count: integer;
disable_auto_convert: cardinal;
end;
(*
* Allocate a filter graph.
*)
// AVFilterGraph * avfilter_graph_alloc(void);
function avfilter_graph_alloc(): pAVFilterGraph; cdecl;
// (*
// * Get a filter definition matching the given name.
// *
// * @param name the filter name to find
// * @return the filter definition, if any matching one is registered.
// * NULL if none found.
// *)
// #if ! FF_API_NOCONST_GET_NAME
// const
// #endif
// avfilter * avfilter_get_by_name(const char * name);
function avfilter_get_by_name(const name: pAnsiChar): pavfilter; cdecl;
//
// (*
// * 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);
function avfilter_graph_create_filter(Var filt_ctx: pAVFilterContext; const filt: pavfilter; const name: pAnsiChar; const args: pAnsiChar;
opaque: pointer; graph_ctx: pAVFilterGraph): integer; cdecl;
//
// (*
// * 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);
function avfilter_graph_config(graphctx: pAVFilterGraph; log_ctx: pointer): integer; cdecl;
//
// (*
// * Free a graph, destroy its links, and set *graph to NULL.
// * If *graph is NULL, do nothing.
// *)
// void avfilter_graph_free(AVFilterGraph * * graph);
procedure avfilter_graph_free(Var graph: pAVFilterGraph); cdecl;
type
(*
* 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.
*)
pAVFilterInOut = ^TAVFilterInOut;
TAVFilterInOut = record
(* unique name for this input/output in the list *)
name: pAnsiChar;
(* filter context associated to this input/output *)
filter_ctx: pAVFilterContext;
(* index of the filt_ctx pad to use for linking *)
pad_idx: integer;
(* next input/input in the list, NULL if this is the last *)
next: pAVFilterInOut;
end;
// (* Initialize the filter system. Register all builtin filters. *)
// void avfilter_register_all(void);
procedure avfilter_register_all(); cdecl;
// (*
// * 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);
function avfilter_inout_alloc(): pAVFilterInOut; cdecl;
// (*
// * Free the supplied list of AVFilterInOut and set *inout to NULL.
// * If *inout is NULL, do nothing.
// *)
// void avfilter_inout_free(AVFilterInOut * * inout);
//
// #
// if AV_HAVE_INCOMPATIBLE_LIBAV_ABI | | ! FF_API_OLD_GRAPH_PARSE
// (*
// * 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 grap 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);
// #
// else
// (*
// * Add a graph described by a string to a graph.
// *
// * @param graph the filter graph where to link the parsed graph context
// * @param filters string to be parsed
// * @param inputs pointer to a linked list to the inputs of the graph, may be NULL.
// * If non-NULL, *inputs is updated to contain the list of open inputs
// * after the parsing, should be freed with avfilter_inout_free().
// * @param outputs pointer to a linked list to the outputs of the graph, may be NULL.
// * If non-NULL, *outputs is updated to contain the list of open outputs
// * after the parsing, should be freed with avfilter_inout_free().
// * @return non negative on success, a negative AVERROR code on error
// * @deprecated Use avfilter_graph_parse_ptr() instead.
// *)
// attribute_deprecated int avfilter_graph_parse(AVFilterGraph * graph, const char * filters, AVFilterInOut * * inputs,
// AVFilterInOut * * outputs, void * log_ctx);
// # endif
//
// (*
// * Add a graph described by a string to a graph.
// *
// * @param graph the filter graph where to link the parsed graph context
// * @param filters string to be parsed
// * @param inputs pointer to a linked list to the inputs of the graph, may be NULL.
// * If non-NULL, *inputs is updated to contain the list of open inputs
// * after the parsing, should be freed with avfilter_inout_free().
// * @param outputs pointer to a linked list to the outputs of the graph, may be NULL.
// * If non-NULL, *outputs is updated to contain the list of open outputs
// * after the parsing, should be freed with avfilter_inout_free().
// * @return non negative on success, a negative AVERROR code on error
// *)
// int avfilter_graph_parse_ptr(AVFilterGraph * graph, const char * filters, AVFilterInOut * * inputs, AVFilterInOut * * outputs,
// void * log_ctx);
function avfilter_graph_parse_ptr(graph: pAVFilterGraph; const filters: pAnsiChar; Var inputs: pAVFilterInOut; Var outputs: pAVFilterInOut;
log_ctx: pointer): integer; cdecl;
//
// (*
// * Add a graph described by a string to a graph.
// *
// * @param[in] graph the filter graph where to link the parsed graph context
// * @param[in] filters string to be parsed
// * @param[out] inputs a linked list of all free (unlinked) inputs of the
// * parsed graph will be returned here. It is to be freed
// * by the caller using avfilter_inout_free().
// * @param[out] outputs a linked list of all free (unlinked) outputs of the
// * parsed graph will be returned here. It is to be freed by the
// * caller using avfilter_inout_free().
// * @return zero on success, a negative AVERROR code on error
// *
// * @note This function returns the inputs and outputs that are left
// * unlinked after parsing the graph and the caller then deals with
// * them.
// * @note This function makes no reference whatsoever to already
// * existing parts of the graph and the inputs parameter will on return
// * contain inputs of the newly parsed part of the graph. Analogously
// * the outputs parameter will contain outputs of the newly created
// * filters.
// *)
// int avfilter_graph_parse2(AVFilterGraph * graph, const char * filters, AVFilterInOut * * inputs, AVFilterInOut * * outputs);
//
// (*
// * Send a command to one or more filter instances.
// *
// * @param graph the filter graph
// * @param target the filter(s) to which the command should be sent
// * "all" sends to all filters
// * otherwise it can be a filter or filter instance name
// * which will send the command to all matching filters.
// * @param cmd the command to send, for handling simplicity all commands must be alphanumeric only
// * @param arg the argument for the command
// * @param res a buffer with size res_size where the filter(s) can return a response.
// *
// * @returns >=0 on success otherwise an error code.
// * AVERROR(ENOSYS) on unsupported commands
// *)
// int avfilter_graph_send_command(AVFilterGraph * graph, const char * target, const char * cmd, const char * arg, char * res, int res_len,
// int flags);
//
// (*
// * Queue a command for one or more filter instances.
// *
// * @param graph the filter graph
// * @param target the filter(s) to which the command should be sent
// * "all" sends to all filters
// * otherwise it can be a filter or filter instance name
// * which will send the command to all matching filters.
// * @param cmd the command to sent, for handling simplicity all commands must be alphanummeric only
// * @param arg the argument for the command
// * @param ts time at which the command should be sent to the filter
// *
// * @note As this executes commands after this function returns, no return code
// * from the filter is provided, also AVFILTER_CMD_FLAG_ONE is not supported.
// *)
// int avfilter_graph_queue_command(AVFilterGraph * graph, const char * target, const char * cmd, const char * arg, int flags, double ts);
//
// (*
// * Dump a graph into a human-readable string representation.
// *
// * @param graph the graph to dump
// * @param options formatting options; currently ignored
// * @return a string, or NULL in case of memory allocation failure;
// * the string must be freed using av_free
// *)
// char * avfilter_graph_dump(AVFilterGraph * graph, const char * options);
//
// (*
// * Request a frame on the oldest sink link.
// *
// * If the request returns AVERROR_EOF, try the next.
// *
// * Note that this function is not meant to be the sole scheduling mechanism
// * of a filtergraph, only a convenience function to help drain a filtergraph
// * in a balanced way under normal circumstances.
// *
// * Also note that AVERROR_EOF does not mean that frames did not arrive on
// * some of the sinks during the process.
// * When there are multiple sink links, in case the requested link
// * returns an EOF, this may cause a filter to flush pending frames
// * which are sent to another sink link, although unrequested.
// *
// * @return the return value of ff_request_frame(),
// * or AVERROR_EOF if all links returned AVERROR_EOF
// *)
// int avfilter_graph_request_oldest(AVFilterGraph * graph);
implementation
uses ffm.lib;
function avfilter_get_by_name; external avfilter_dll;
function avfilter_inout_alloc; external avfilter_dll;
function avfilter_graph_alloc; external avfilter_dll;
function avfilter_graph_create_filter; external avfilter_dll;
function avfilter_graph_parse_ptr; external avfilter_dll;
function avfilter_graph_config; external avfilter_dll;
procedure avfilter_register_all; external avfilter_dll;
procedure avfilter_graph_free; external avfilter_dll;
end.
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