schema_version: 7.0
type: filter
identifier: audiolevel
title: Audio Levels
version: 2
copyright: Dan Dennedy, Marco Gittler, and Steve Harris
creator: Dan Dennedy
contributor:
  - Marco Gittler
  - Steve Harris
license: GPLv2
language: en
description: Compute the audio amplitude.
notes: >
  This filter provides the amplitude level as a percentage value in floating point.
  This does not do any "slowing" of the data by averaging out peaks and
  troughs of short duration like a VU meter.
  Applications can also get this data on the frame as meta.media.audio_level.<N>
  where <N> is the channel number starting with 0.
tags:
  - Audio
parameters:
  - identifier: iec_scale
    title: Use IEC 60268-18 Scale
    type: boolean
    default: 1
    widget: checkbox

  - identifier: dbpeak
    title: output true peak value in dB instead of a percentage in _audio_level.<N>
    type: boolean
    default: 0
    widget: checkbox

  - identifier: _audio_level.<N>
    description: >
        <N> is the channel number starting with 0.
        This is updated on every frame with audio.
    readonly: yes
    type: float
    minimum: 0
    maximum: 1
