schema_version: 0.1
type: filter
identifier: loudness
title: Loudness
version: 1
copyright: Brian Matherly <pez4brian@yahoo.com>
creator: Brian Matherly <pez4brian@yahoo.com>
license: LGPLv2.1
language: en
tags:
  - Audio
description: Correct audio loudness as recommended by EBU R128.
notes: >
  This filter requires two passes. The first pass performs analysis and stores
  the result in the "results" property. The second pass applies the results to
  the audio in order to achieve the desired loudness over the range of the 
  filter.
  
parameters:
  - identifier: results
    title: Analysis Results
    type: string
    description: >
      Set after analysis. Used during application.
      Loudness information about the original audio.
      When results are not supplied, the filter computes the results and stores
      them in this property when the last frame has been processed.
    mutable: no
    
  - identifier: program
    title: Target Program Loudness
    type: float
    description: >
      Used during application.
      The target program loudness in LUFS (Loudness Units Full Scale).
    readonly: no
    mutable: yes
    default: -23.0
    minimum: -50.0
    maximum: -10.0
    unit: LUFS