Module Fdkaac.Encoder

module Encoder: sig .. end

AAC encoding module for OCaml

Exceptions

exception Invalid_handle

exception Unsupported_parameter

exception Invalid_config

exception Error of int

exception End_of_file

exception Unknown of int

val string_of_exception : exn -> string option

Types

type t

type mpeg2_aac = [ `AAC_LC | `HE_AAC | `HE_AAC_v2 ]

type mpeg4_aac = [ `AAC_ELD | `AAC_LC | `AAC_LD | `HE_AAC | `HE_AAC_v2 ]

type aot = [ `Mpeg_2 of mpeg2_aac | `Mpeg_4 of mpeg4_aac ]

type bitrate_mode = [ `Constant | `Full_bitreservoir | `Variable of int ]

VBR modes gives roughly the following bit rates per channel:

VBR | kbps/channel | AOTs ------------------------- 1 | 20-32 | LC,HE,HEv2 2 | 32-40 | LC,HE,HEv2 3 | 48-56 | LC,HE,HEv2 4 | 64-72 | LC 5 | 96-112 | LC

HE bit rates will be much lower.

type transmux = [ `Adif | `Adts | `Latm | `Latm_out_of_band | `Loas | `Raw ]

type param_name = [ `Afterburner
       | `Aot
       | `Bandwidth
       | `Bitrate
       | `Bitrate_mode
       | `Granule_length
       | `Samplerate
       | `Sbr_mode
       | `Transmux ]

type param = [ `Afterburner of bool
       | `Aot of aot
       | `Bandwidth of int
       | `Bitrate of int
       | `Bitrate_mode of bitrate_mode
       | `Granule_length of int
       | `Samplerate of int
       | `Sbr_mode of bool
       | `Transmux of transmux ]

Functions

val create : int -> t

val set : t -> param -> unit

val get : t -> param_name -> param

val encode : t -> string -> int -> int -> string

val flush : t -> string