Equalizer APO Syntax Highlighter

This extension provides syntax highlighting for Equalizer APO configuration files, making it easier to read and edit your audio processing configurations.

Features

Comprehensive syntax highlighting for all Equalizer APO commands
Support for both hash (#) and semicolon (;) comments
Support for inline expressions with mathematical and logical operators
Highlighting for filter types, parameters, and values
Recognition of channel identifiers and stage names
Support for conditional statements and expressions
Automatic file association for common Equalizer APO configuration files
Hover information for commands, filter types, and expressions
Auto-completion with detailed documentation for commands, filter types, and parameters
Multiple configuration templates for quick setup
Automatic indentation for conditional blocks
Highlighting of invalid lines as comments (matching Equalizer APO's behavior)

Installation

From VS Code Marketplace

Open VS Code
Press Ctrl+P to open the Quick Open dialog
Type ext install equalizer-apo-syntax to find the extension
Click the Install button

From VSIX File

Download the .vsix file from the releases page
In VS Code, go to the Extensions view (Ctrl+Shift+X)
Click the "..." menu in the top-right of the Extensions view
Select "Install from VSIX..." and choose the downloaded file

Usage

File Recognition

The extension automatically recognizes files with the following patterns:

config.txt in any directory
Any .txt file in a directory path containing EqualizerAPO/config/

For other files, you can manually set the language mode to "Equalizer APO" by:

Clicking on the language indicator in the bottom-right corner of VS Code
Selecting "Equalizer APO" from the list

Creating New Configuration Files

You can create new Equalizer APO configuration files with predefined templates:

Right-click on a folder in the Explorer view
Select "Equalizer APO: Create New Configuration File"
Choose a template from the list
Enter a filename (default: config.txt)

Available templates:

Basic Configuration
Stereo Configuration
Surround Configuration
Advanced Configuration
Headphone EQ

Editing Features

While editing Equalizer APO configuration files, you can:

Hover over commands, filter types, and expression elements to see detailed documentation
Use auto-completion for commands, filter types, parameters, and expression elements
Format the document to properly indent conditional blocks
See invalid lines highlighted as comments (matching Equalizer APO's behavior of silently ignoring them)

Supported Commands

Filtering Commands

Preamp: Sets a preamplification value in decibels
Filter: Adds various types of audio filters (PK, LP, HP, BP, LS, HS, etc.)
Delay: Delays the audio by milliseconds or samples
Copy: Copies and mixes audio between channels
GraphicEQ: Creates a graphic equalizer with multiple bands
Convolution: Processes audio using an impulse response file

Control Commands

Include: Loads another configuration file
Device: Selects devices to which the following commands apply
Channel: Selects channels to which the following commands apply
Stage: Specifies on which stage(s) the following commands will be executed

Expression Commands

If / ElseIf / Else / EndIf: Conditionally executes commands
Eval: Evaluates expressions and defines variables
Inline expressions: Embeds expression results in command parameters using backticks

Filter Types

Equalizer APO supports a wide range of filter types, all of which are highlighted and documented in this extension:

PK/Modal/PEQ: Peaking/Parametric EQ filters
LP/LPQ: Low-pass filters
HP/HPQ: High-pass filters
BP: Band-pass filter
LS/LSC: Low-shelf filters (with optional S parameter for slope)
HS/HSC: High-shelf filters (with optional S parameter for slope)
NO: Notch filter
AP: All-pass filter
IIR: Custom IIR filter with coefficients

Filter Parameters

The extension provides detailed documentation and completions for all filter parameters:

Fc: Center/cutoff frequency in Hz
Gain: Boost or cut in dB
Q: Quality factor (controls filter width)
BW Oct: Bandwidth in octaves (alternative to Q)
S: Slope for shelf filters (0.71 = standard 1st order)
T60 target: Decay time for Modal filters in ms

License

rafifos/vscode-equalizer-apo-syntax

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