# Advanced features

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Beyond the core audio controls, the Video SDK for Android offers several advanced audio features.

## Monitor mic and speaker volume

The SDK reports the local microphone and speaker volume levels through the `onMicSpeakerVolumeChanged` callback. Use this to drive a volume meter in your UI or to detect when the mic gain has been pushed unusually low.

```kotlin
override fun onMicSpeakerVolumeChanged(micVolume: Int, speakerVolume: Int) {
    // Volumes are reported on a 0-255 scale.
    updateMicMeter(micVolume)
    updateSpeakerMeter(speakerVolume)
}
```

```java
@Override
public void onMicSpeakerVolumeChanged(int micVolume, int speakerVolume) {
    // Volumes are reported on a 0-255 scale.
    updateMicMeter(micVolume);
    updateSpeakerMeter(speakerVolume);
}
```

## Adjust a user's local volume

You can control how loud each user sounds _on the local device_ using `setUserVolume` on the `ZoomVideoSDKUser` object. This only changes what the current user hears. It does not change the volume for any other participant in the session.

Volume is a `float` in the range `0` to `10`. Setting it to `0` effectively mutes that user locally without muting them in the session. The second argument selects whether you are adjusting microphone audio (`false`) or shared audio (`true`, used when the user is sharing a screen with audio).

```kotlin
// Half-volume on a remote user's microphone audio.
if (remoteUser.canSetUserVolume(false)) {
    remoteUser.setUserVolume(5.0f, false)
}

// Locally silence a noisy user without muting them for everyone.
remoteUser.setUserVolume(0f, false)

// Read the current local volume.
val currentVolume = remoteUser.getUserVolume(false)
```

```java
// Half-volume on a remote user's microphone audio.
if (remoteUser.canSetUserVolume(false)) {
    remoteUser.setUserVolume(5.0f, false);
}

// Locally silence a noisy user without muting them for everyone.
remoteUser.setUserVolume(0f, false);

// Read the current local volume.
float currentVolume = remoteUser.getUserVolume(false);
```

Use `canSetUserVolume` to check whether the SDK currently permits a volume change for that audio source. For example, the SDK returns `false` for a user who is not connected to audio.

## Subscribe to raw audio data

For server-side processing, transcription, or custom audio pipelines, the SDK can deliver raw PCM audio. Call `subscribe()` on the `ZoomVideoSDKAudioHelper` to begin receiving raw audio, and `unSubscribe()` to stop. The mixed, per-user, and shared raw streams arrive through the `onMixedAudioRawDataReceived`, `onOneWayAudioRawDataReceived`, and `onShareAudioRawDataReceived` callbacks.

```kotlin
ZoomVideoSDK.getInstance().audioHelper.subscribe()
```

```java
ZoomVideoSDK.getInstance().getAudioHelper().subscribe();
```

For the full raw-data integration pattern (buffer format, sample rate, and processing examples), see [Receive raw data](/docs/video-sdk/android/raw-data/receive-raw-data/).