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(** This module provides an API to AVfilter. *)
open Avutil
type config
type valued_arg =
[ `String of string
| `Int of int
| `Int64 of int64
| `Float of float
| `Rational of rational ]
type args = [ `Flag of string | `Pair of string * valued_arg ]
type ('a, 'b) av = { audio : 'a; video : 'b }
type ('a, 'b) io = { inputs : 'a; outputs : 'b }
(** (attached/unattached, audio/video, input/output) pad *)
type ('a, 'b, 'c) pad
type ('a, 'b) pads =
(('a, [ `Audio ], 'b) pad list, ('a, [ `Video ], 'b) pad list) av
type flag =
[ `Dynamic_inputs
| `Dynamic_outputs
| `Slice_threads
| `Support_timeline_generic
| `Support_timeline_internal ]
type 'a filter = {
name : string;
description : string;
options : Avutil.Options.t;
flags : flag list;
io : (('a, [ `Input ]) pads, ('a, [ `Output ]) pads) io;
}
type 'a input = [ `Frame of 'a frame | `Flush ] -> unit
type 'a context
type 'a output = { context : 'a context; handler : unit -> 'a frame }
type 'a entries = (string * 'a) list
type inputs = ([ `Audio ] input entries, [ `Video ] input entries) av
type outputs = ([ `Audio ] output entries, [ `Video ] output entries) av
type t = (inputs, outputs) io
(* Output context. *)
val time_base : _ context -> Avutil.rational
val frame_rate : [ `Video ] context -> Avutil.rational
val width : [ `Video ] context -> int
val height : [ `Video ] context -> int
val pixel_aspect : [ `Video ] context -> Avutil.rational option
val pixel_format : [ `Video ] context -> Avutil.Pixel_format.t
val channels : [ `Audio ] context -> int
val channel_layout : [ `Audio ] context -> Avutil.Channel_layout.t
val sample_rate : [ `Audio ] context -> int
val sample_format : [ `Audio ] context -> Avutil.Sample_format.t
val set_frame_size : [ `Audio ] context -> int -> unit
exception Exists
(** Filter list. *)
val filters : [ `Unattached ] filter list
val find : string -> [ `Unattached ] filter
val find_opt : string -> [ `Unattached ] filter option
(** Buffers (input). *)
val abuffer : [ `Unattached ] filter
val buffer : [ `Unattached ] filter
(** Sinks (output). *)
val abuffersink : [ `Unattached ] filter
val buffersink : [ `Unattached ] filter
(** Pad name. *)
val pad_name : _ pad -> string
(** Initiate a filter graph configuration. *)
val init : unit -> config
(** Attach a filter to a filter graph configuration. Raises [Exists] if there is
already a filter by that name in the graph. Number of inputs or outputs can
change from the filter's specifications, in particular if the filter has the
[`Dynamic_input] or [`Dynamic_output] flag set. *)
val attach :
?args:args list ->
name:string ->
[ `Unattached ] filter ->
config ->
[ `Attached ] filter
(** Link two filter pads. *)
val link :
([ `Attached ], 'a, [ `Output ]) pad ->
([ `Attached ], 'a, [ `Input ]) pad ->
unit
type command_flag = [ `Fast ]
(** Send a command to a attached filter pad. *)
val process_command :
?flags:command_flag list ->
cmd:string ->
?arg:string ->
[ `Attached ] filter ->
string
(** Parse a graph described by a string and attach outputs/inputs to it. *)
type ('a, 'b, 'c) parse_node = {
node_name : string;
node_args : args list option;
node_pad : ('a, 'b, 'c) pad;
}
type ('a, 'b) parse_av =
( ('a, [ `Audio ], 'b) parse_node list,
('a, [ `Video ], 'b) parse_node list )
av
type 'a parse_io = (('a, [ `Input ]) parse_av, ('a, [ `Output ]) parse_av) io
val parse :
[ `Unattached ] parse_io -> string -> config -> [ `Attached ] parse_io
(** Check validity and configure all the links and formats in the graph and
return its outputs and outputs. *)
val launch : config -> t
module Utils : sig
type audio_converter
type audio_params = {
sample_rate : int;
channel_layout : Avutil.Channel_layout.t;
sample_format : Avutil.Sample_format.t;
}
val init_audio_converter :
?out_params:audio_params ->
?out_frame_size:int ->
in_time_base:Avutil.rational ->
in_params:audio_params ->
unit ->
audio_converter
val time_base : audio_converter -> Avutil.rational
val convert_audio :
audio_converter ->
(Avutil.audio Avutil.frame -> unit) ->
[ `Frame of Avutil.audio Avutil.frame | `Flush ] ->
unit
end
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