package ffmpeg-av
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Source file av.ml
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open Avutil external init : unit -> unit = "ocaml_av_init" [@@noalloc] let () = init () external container_options : unit -> Options.t = "ocaml_av_container_options" let container_options = container_options () (* Format *) module Format = struct external get_input_name : (input, _) format -> string = "ocaml_av_input_format_get_name" external get_input_long_name : (input, _) format -> string = "ocaml_av_input_format_get_long_name" external find_input_format : string -> (input, 'a) format = "ocaml_av_find_input_format" let find_input_format name = try Some (find_input_format name) with Not_found -> None external get_output_name : (output, _) format -> string = "ocaml_av_output_format_get_name" external get_output_long_name : (output, _) format -> string = "ocaml_av_output_format_get_long_name" external get_audio_codec_id : (output, audio) format -> Avcodec.Audio.id = "ocaml_av_output_format_get_audio_codec_id" external get_video_codec_id : (output, video) format -> Avcodec.Video.id = "ocaml_av_output_format_get_video_codec_id" external get_subtitle_codec_id : (output, subtitle) format -> Avcodec.Subtitle.id = "ocaml_av_output_format_get_subtitle_codec_id" external guess_output_format : string -> string -> string -> (output, 'a) format option = "ocaml_av_output_format_guess" let guess_output_format ?(short_name = "") ?(filename = "") ?(mime = "") () = guess_output_format short_name filename mime end (* Input *) external open_input : string -> (input, _) format option -> (string * string) array -> input container * string array = "ocaml_av_open_input" let open_input ?format ?opts url = let opts = opts_default opts in let ret, unused = open_input url format (mk_opts_array opts) in filter_opts unused opts; ret type avio type read = bytes -> int -> int -> int type write = bytes -> int -> int -> int type _seek = int -> int -> int type seek = int -> Unix.seek_command -> int let seek_of_int = function | 0 -> Unix.SEEK_SET | 1 -> Unix.SEEK_CUR | 2 -> Unix.SEEK_END | _ -> assert false external ocaml_av_create_io : int -> read option -> write option -> _seek option -> avio = "ocaml_av_create_io" let _seek_of_seek = function | None -> None | Some fn -> Some (fun a m -> fn a (seek_of_int m)) let ocaml_av_create_read_io len ?seek read = ocaml_av_create_io len (Some read) None (_seek_of_seek seek) external ocaml_av_open_input_stream : avio -> (input, _) format option -> (string * string) array -> input container * string array = "ocaml_av_open_input_stream" let ocaml_av_open_input_stream ?format ?opts avio = let opts = opts_default opts in let ret, unused = ocaml_av_open_input_stream avio format (mk_opts_array opts) in filter_opts unused opts; ret external caml_av_input_io_finalise : avio -> unit = "caml_av_input_io_finalise" let open_input_stream ?format ?opts ?seek read = let avio = ocaml_av_create_read_io 4096 ?seek read in let cleanup () = caml_av_input_io_finalise avio in let input = ocaml_av_open_input_stream ?format ?opts avio in Gc.finalise_last cleanup input; input external _get_duration : input container -> int -> Time_format.t -> Int64.t = "ocaml_av_get_duration" let get_input_duration ?(format = `Second) i = match _get_duration i (-1) format with 0L -> None | d -> Some d external _get_metadata : input container -> int -> (string * string) list = "ocaml_av_get_metadata" let get_input_metadata i = List.rev (_get_metadata i (-1)) external input_obj : input container -> 'a = "ocaml_av_input_obj" let input_obj c = Obj.magic (input_obj c, c) (* Input Stream *) type ('a, 'b, 'c) stream = { container : 'a container; index : int } type media_type = MT_audio | MT_video | MT_subtitle let mk_stream container index = { container; index } external get_codec_params : (_, 'm, _) stream -> 'm Avcodec.params = "ocaml_av_get_stream_codec_parameters" external get_time_base : (_, _, _) stream -> Avutil.rational = "ocaml_av_get_stream_time_base" external set_time_base : (_, _, _) stream -> Avutil.rational -> unit = "ocaml_av_set_stream_time_base" external get_frame_size : (_, audio, _) stream -> int = "ocaml_av_get_stream_frame_size" external get_pixel_aspect : (_, video, _) stream -> Avutil.rational = "ocaml_av_get_stream_pixel_aspect" external _get_streams : input container -> media_type -> int list = "ocaml_av_get_streams" let get_streams input media_type = _get_streams input media_type |> List.rev_map (fun i -> let s = mk_stream input i in (i, s, get_codec_params s)) let get_audio_streams input = get_streams input MT_audio let get_video_streams input = get_streams input MT_video let get_subtitle_streams input = get_streams input MT_subtitle external _find_best_stream : input container -> media_type -> int = "ocaml_av_find_best_stream" let find_best_stream c t = let i = _find_best_stream c t in let s = mk_stream c i in (i, s, get_codec_params s) let find_best_audio_stream c = find_best_stream c MT_audio let find_best_video_stream c = find_best_stream c MT_video let find_best_subtitle_stream c = find_best_stream c MT_subtitle let get_input s = s.container let get_index s = s.index let get_duration ?(format = `Second) s = _get_duration s.container s.index format let get_metadata s = List.rev (_get_metadata s.container s.index) type input_result = [ `Audio_packet of int * audio Avcodec.Packet.t | `Audio_frame of int * audio frame | `Video_packet of int * video Avcodec.Packet.t | `Video_frame of int * video frame | `Subtitle_packet of int * subtitle Avcodec.Packet.t | `Subtitle_frame of int * subtitle frame ] (** Reads the selected streams if any or all streams otherwise. *) external read_input : int array -> int array -> input container -> input_result = "ocaml_av_read_input" let get_id input = List.map (fun { index; container } -> if container != input then raise (Failure "Inconsistent stream and input!"); index) let read_input ?(audio_packet = []) ?(audio_frame = []) ?(video_packet = []) ?(video_frame = []) ?(subtitle_packet = []) ?(subtitle_frame = []) input = let packet = Array.of_list ( get_id input audio_packet @ get_id input video_packet @ get_id input subtitle_packet ) in let frame = Array.of_list ( get_id input audio_frame @ get_id input video_frame @ get_id input subtitle_frame ) in read_input packet frame input type seek_flag = | Seek_flag_backward | Seek_flag_byte | Seek_flag_any | Seek_flag_frame external seek : flags:seek_flag array -> ?stream:(input, _, _) stream -> ?min_ts:Int64.t -> ?max_ts:Int64.t -> fmt:Time_format.t -> ts:Int64.t -> input container -> unit = "ocaml_av_seek_bytecode" "ocaml_av_seek_native" let seek ?(flags = []) = seek ~flags:(Array.of_list flags) (* Output *) external open_output : ?format:(output, _) format -> string -> (string * string) array -> output container * string array = "ocaml_av_open_output" let open_output ?format ?opts fname = let opts = opts_default opts in let ret, unused = open_output ?format fname (mk_opts_array opts) in filter_opts unused opts; ret external ocaml_av_open_output_stream : (output, _) format -> avio -> (string * string) array -> output container * string array = "ocaml_av_open_output_stream" let open_output_stream ?opts ?seek write format = let opts = opts_default opts in let avio = ocaml_av_create_io 4096 None (Some write) (_seek_of_seek seek) in let cleanup () = caml_av_input_io_finalise avio in let output, unused = ocaml_av_open_output_stream format avio (mk_opts_array opts) in filter_opts unused opts; Gc.finalise_last cleanup output; output external output_started : output container -> bool = "ocaml_av_header_written" external _set_metadata : _ container -> int -> (string * string) array -> unit = "ocaml_av_set_metadata" let set_output_metadata o = _set_metadata o (-1) (Array.of_list tags) let set_metadata s = _set_metadata s.container s.index (Array.of_list tags) let get_output s = s.container external new_stream_copy : output container -> _ Avcodec.params -> int = "ocaml_av_new_stream_copy" let new_stream_copy ~params container = let ret = new_stream_copy container params in mk_stream container ret external new_audio_stream : _ container -> int -> [ `Encoder ] Avcodec.Audio.t -> (string * string) array -> int * string array = "ocaml_av_new_audio_stream" let new_audio_stream ?opts ?channels ?channel_layout ~sample_rate ~sample_format ~time_base ~codec container = let opts = mk_audio_opts ?opts ?channels ?channel_layout ~sample_rate ~sample_format ~time_base () in let ret, unused = new_audio_stream container (Sample_format.get_id sample_format) codec (mk_opts_array opts) in filter_opts unused opts; mk_stream container ret external new_video_stream : ?device_context:Avutil.HwContext.device_context -> ?frame_context:Avutil.HwContext.frame_context -> _ container -> [ `Encoder ] Avcodec.Video.t -> (string * string) array -> int * string array = "ocaml_av_new_video_stream" let new_video_stream ?opts ?frame_rate ?hardware_context ~pixel_format ~width ~height ~time_base ~codec container = let opts = mk_video_opts ?opts ?frame_rate ~pixel_format ~width ~height ~time_base () in let device_context, frame_context = match hardware_context with | None -> (None, None) | Some (`Device_context hardware_context) -> (Some hardware_context, None) | Some (`Frame_context frame_context) -> (None, Some frame_context) in let ret, unused = new_video_stream ?device_context ?frame_context container codec (mk_opts_array opts) in filter_opts unused opts; mk_stream container ret external new_subtitle_stream : _ container -> [ `Encoder ] Avcodec.Subtitle.t -> (string * string) array -> int * string array = "ocaml_av_new_subtitle_stream" let new_subtitle_stream ?opts ~time_base ~codec container = let opts = opts_default opts in Hashtbl.add opts "time_base" (`String (Avutil.string_of_rational time_base)); let ret, unused = new_subtitle_stream container codec (mk_opts_array opts) in filter_opts unused opts; mk_stream container ret external codec_attr : _ stream -> string option = "ocaml_av_codec_attr" external bitrate : _ stream -> int option = "ocaml_av_stream_bitrate" external write_packet : (output, 'media, [ `Packet ]) stream -> Avutil.rational -> 'media Avcodec.Packet.t -> unit = "ocaml_av_write_stream_packet" external write_frame : (output, 'media, [ `Frame ]) stream -> 'media frame -> unit = "ocaml_av_write_stream_frame" external flush : output container -> unit = "ocaml_av_flush" external was_keyframe : (output, _, _) stream -> bool = "ocaml_av_was_keyframe" external write_audio_frame : output container -> audio frame -> unit = "ocaml_av_write_audio_frame" external write_video_frame : output container -> video frame -> unit = "ocaml_av_write_video_frame" external close : _ container -> unit = "ocaml_av_close"