schema_version: 0.3
type: filter
identifier: audiolevelgraph
title: Audio Level Visualization Filter
version: 1
copyright: Meltytech, LLC
license: LGPLv2.1
language: en
tags:
  - Video
description: >
  An audio visualization filter that draws an audio level meter on the image.

parameters:
  - identifier: type
    title: Graph type
    description: The type of graph to display the levels.
    type: string
    default: bar
    values:
      - segment
      - bar
    readonly: no
    mutable: yes
    widget: combo

  - identifier: bgcolor
    title: Background Color
    type: color
    description: |
      The background color to be applied to the entire frame. The default color 
      is transparent.
      
      A color value is a hexadecimal representation of RGB plus alpha channel 
      as 0xrrggbbaa. Colors can also be the words: white, black, red, green,
      or blue. You can also use a HTML-style color values #rrggbb or #aarrggbb.
    readonly: no
    mutable: yes
    widget: color
    
  - identifier: color.*
    title: Foreground color
    type: color
    description: |
      The color of the waveform.
      
      Multiple colors can be specified with incrementing suffixes to cause the
      waveform to be drawn in a gradient. color.1 is the top of the waveform.
      Subsequent colors will produce a gradient toward the bottom.
      
      By default, the filter has one color defined:
      
          color.1=0xffffffff"
          
      This results in a white waveform.
      
      To create a gradient, define more colors:
      
          color.2=green color.3=0x77777777
      
      A color value is a hexadecimal representation of RGB plus alpha channel 
      as 0xrrggbbaa. Colors can also be the words: white, black, red, green,
      or blue. You can also use a HTML-style color values #rrggbb or #aarrggbb.
    readonly: no
    mutable: yes
    widget: color

  - identifier: thickness
    title: Line Thickness
    type: integer
    description: >
      The thickness of the bar or segments.
    readonly: no
    default: 0
    minimum: 0
    maximum: 20
    mutable: yes
    widget: spinner
    unit: pixels
    
  - identifier: angle
    title: Angle
    type: float
    description: >
      The rotation angle to be applied to the waveform.
    readonly: no
    default: 0
    minimum: 0
    maximum: 360
    mutable: yes
    widget: spinner

  - identifier: rect
    title: Rectangle
    description: >
      Defines the rectangle that the waveform(s) should be drawn in.
      
      Format is: "X Y W H".
      
      X, Y, W, H are assumed to be pixel units unless they have the suffix '%'.
    type: rect
    default: "0 0 100% 100%"
    readonly: no
    mutable: yes
    
  - identifier: mirror
    title: Mirror
    description: >
      Mirror the spectrum about the center of the rectangle.
    type: boolean
    default: 0
    readonly: no
    mutable: yes
    widget: checkbox

  - identifier: reverse
    title: Reverse
    description: >
      Draw the points starting with the right channel first.
    type: boolean
    default: 0
    readonly: no
    mutable: yes
    widget: checkbox

  - identifier: gorient
    title: Gradient Orientation
    description: Direction of the color gradient.
    type: string
    default: vertical
    values:
      - vertical
      - horizontal
    readonly: no
    mutable: yes
    widget: combo
    
  - identifier: channels
    title: Channels
    type: integer
    description: >
      The number of channels to show.
    mutable: yes
    readonly: no
    default: 2

  - identifier: segments
    title: Segments
    type: integer
    description: >
      The number of segments to draw if the graph type is "segment".
    mutable: yes
    readonly: no
    default: 10
    minimum: 2
    maximum: 100

  - identifier: segment_gap
    title: Segment Gap
    type: integer
    description: >
      The space in pixels between the segments.
    mutable: yes
    readonly: no
    default: 10
    minimum: 0
    maximum: 100
    unit: pixels