> ## Documentation Index
> Fetch the complete documentation index at: https://docs.inworld.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Audio Capture Module

[Overview](../overview) > Audio Capture Module

**Class:** `AudioCaptureModule` | **Inherits from:** `InworldAudioModule` | **Implements:** `IMicrophoneHandler`

Core module responsible for microphone capture and audio input management in the Inworld framework. This module handles the low-level microphone operations and audio thread management. Only one AudioCaptureModule should be active in the module list at any time.

> **Note:** This module is not available on Unity WebGL builds due to microphone access limitations.

## Properties

* [autoStart](#autostart)
* [IsMicRecording](#ismicrecording)

## Methods

* [StartMicrophone](#startmicrophone)
* [StopMicrophone](#stopmicrophone)
* [ChangeInputDevice](#changeinputdevice)
* [ListMicDevices](#listmicdevices)

## Reference

### autoStart

Determines whether the microphone should automatically start when this module initializes.
When true, the microphone will begin capturing and calibration will start automatically.

#### Returns

**Type:** `bool`

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### IsMicRecording

Gets whether the microphone is currently recording.

#### Returns

**Type:** `bool`

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### StartMicrophone

Initializes and starts the microphone capture system using Unity's built-in microphone functionality.
Creates an AudioClip for continuous recording and begins the audio processing thread.

#### Returns

**Type:** `bool`

**Description:** True if the microphone was successfully started and an AudioClip was created; otherwise, false.

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### StopMicrophone

Stop the microphone input using Unity's official method.

#### Returns

**Type:** `bool`

**Description:** True if successfully stopped, false otherwise.

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### ChangeInputDevice

Changes the microphone input device name.

#### Parameters

| Parameter  | Type     | Description                   |
| ---------- | -------- | ----------------------------- |
| deviceName | `string` | The device name to switch to. |

#### Returns

**Type:** `bool`

**Description:** True if the device was successfully changed, false otherwise.

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### ListMicDevices

Gets the list of available microphone devices.

#### Returns

**Type:** `List<string>`

**Description:** A list of available microphone device names.

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## Important Notes

### Single Instance Requirement

Only one AudioCaptureModule should be active in the module list at any time. Having multiple instances can cause conflicts in microphone access and audio processing.

### WebGL Compatibility

This module is not available on Unity WebGL builds due to microphone access limitations. The code is wrapped in `#if !UNITY_WEBGL` preprocessor directives.

### Microphone vs Recording State

The Start/Stop microphone functions control the underlying audio capture system, separate from recording state which controls actual data transmission. Use these functions sparingly and only when necessary for system management.

### Automatic Initialization

When `autoStart` is enabled (default), the module will automatically:

1. Start the microphone when the component initializes
2. Begin calibration if the microphone starts successfully

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