Class AudioCapture

Manages microphone access and streams raw PCM audio to a registered handler.

const capture = new AudioCapture({ sampleRateHz: 16_000, chunkFrames: 1024 });
capture.onChunk((pcm) => vad.feed(pcm));
await capture.start();

Index

Constructors

Methods

isActive onChunk start stop

Constructors

constructor

new AudioCapture(config: AudioCaptureConfig): AudioCapture
Creates a new AudioCapture instance. Does not open the microphone — call start for that.
Parameters
- config: AudioCaptureConfig
  Capture settings (sample rate, chunk size, optional device ID).
Returns AudioCapture
- Defined in apps/tutor/src/voice/AudioCapture.ts:66

Methods

isActive

isActive(): boolean
Returns true if the microphone stream is currently live.

Returns boolean
true when capturing, false when stopped or not yet started.
- Defined in apps/tutor/src/voice/AudioCapture.ts:106

onChunk

onChunk(cb: AudioChunkCallback): void
Registers the callback that will receive PCM audio chunks. Replaces any previously registered callback.
Parameters
- cb: AudioChunkCallback
  Invoked with each Float32Array PCM chunk.
Returns void
- Defined in apps/tutor/src/voice/AudioCapture.ts:97

start

start(): Promise<void>
Requests microphone permission, opens the audio stream, and begins emitting PCM chunks to the registered callback.

Returns Promise<void>
Resolves once the stream is live and chunks will be emitted.

Throws
If the user denies microphone permission.
- Defined in apps/tutor/src/voice/AudioCapture.ts:77

stop

stop(): Promise<void>
Stops the audio stream and releases the microphone device so other browser tabs can acquire it.

Returns Promise<void>
Resolves once the stream is fully torn down.
- Defined in apps/tutor/src/voice/AudioCapture.ts:87