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"Send audio buffer to backend" – Unreal Engine 5

For this feature, I implemented the microphone-recording system inside Unreal Engine 5.
The goal was to reliably capture microphone audio and export it so the backend can process it later.

1. Microphone Recording System

I created a dedicated Blueprint called BP_AudioManager which is responsible for handling microphone input.

Start Recording

Uses an AudioCapture component.

Calls StartRecordingOutput to begin capturing audio.

Stores the recorded data in a SoundWave variable.

Activates the microphone and starts listening.

Stop Recording

Calls FinishRecordingOutput, which finalizes the recording.

Unreal automatically exports the recording to a .wav file inside:
Saved/AudioCaptures/

The file path is stored in a Blueprint variable so it can be accessed by other systems.

This ensures that every recording session produces a usable audio file.

2. Push-to-Talk Input Logic

To control recording, I added a Push-to-Talk input action using the Enhanced Input System:

First press → Start recording

Second press → Stop recording

A Blueprint boolean (bIsMicRecording) toggles between the two states.
This creates a simple and reliable record/stop workflow.

3. What Is Completed for This Ticket

The following tasks are fully implemented:

Microphone audio is captured inside UE5

Audio is exported to disk as a WAV file

Recording can be triggered manually through a Push-to-Talk input action

The system is stable and ready to be connected to the backend in the next step