Wwise

// Add to your .Build.cs
PublicDependencyModuleNames.AddRange(new string[] {
    "LCKWwise",
    "LCKAudio",
    "AkAudio"
});

class FLCKWwiseSource : public ILCKAudioSource
{
public:
    FLCKWwiseSource();

    bool StartCapture() noexcept override;
    bool StartCapture(TLCKAudioChannelsMask Channels) noexcept override;
    void StopCapture() noexcept override;
    const FString& GetSourceName() const noexcept override;
    float GetVolume() const noexcept override;

private:
    AkOutputDeviceID OutputDeviceId = 0;
    int32 Samplerate = 48000;
};

┌─────────────────────────────────────────┐
│           Wwise Sound Engine            │
├─────────────────────────────────────────┤
│  Events → Actor-Mixer → Master Bus      │
│                    ↓                    │
│              Final Mix                  │
└────────────────────────┬────────────────┘
                         │
                  ┌──────▼──────┐
                  │  LCKWwise   │
                  │  Capture    │
                  └─────────────┘

bool FLCKWwiseSource::StartCapture() noexcept
{
    if (auto* SoundEngine = IWwiseSoundEngineAPI::Get())
    {
        AkOutputSettings OutputSettings;
        OutputSettings.channelConfig = AkChannelConfig::Standard(AK_SPEAKER_SETUP_STEREO);
        SoundEngine->AddOutput(OutputSettings, &OutputDeviceId);
        SoundEngine->RegisterCaptureCallback(WWise_CaptureCallback, OutputDeviceId, this);
        Samplerate = SoundEngine->GetSampleRate();
    }
    return true;
}

// B-format decoding matrix for stereo
// Coefficients derived from spherical harmonics for +/-30 degree speakers
const float LeftMatrix[16] = {
    0.707f, -0.612f, 0.0f, -0.353f, 0.223f, -0.223f, 0.0f, -0.096f,
    0.096f, 0.0f, 0.05f, -0.05f, 0.0f, 0.02f, -0.02f, 0.0f
};

DECLARE_LOG_CATEGORY_EXTERN(LogLCKWwise, Log, All);