Feature: Add setVolume() method for RemoteAudioTrack

[Trirrin]

Feature Request

Description

Add a setVolume(float volume) method to RemoteAudioTrack class to allow per-participant volume control.

Use Case

In the RMS Chatroom Fabric Mod, users need to adjust the volume of individual voice chat participants (0-200%, similar to Discord). Currently, the SDK's RemoteAudioTrack only exposes setEnabled() and isEnabled() methods, but no volume control.

Proposed API

public class RemoteAudioTrack extends AudioTrack {
    /**
     * Set the playback volume for this remote audio track.
     * @param volume Volume level: 0.0 = mute, 1.0 = normal, 2.0 = 200% boost
     */
    public void setVolume(float volume);
    
    /**
     * Get the current volume level.
     * @return Current volume (0.0 - 2.0)
     */
    public float getVolume();
}

Implementation Notes

This would likely require accessing the underlying WebRTC audio track and applying gain control. The Android LiveKit SDK has this via RemoteAudioTrack.setVolume(double volume).

References

• Android SDK implementation: https://docs.livekit.io/reference/client-sdk-android/livekit-android-sdk/io.livekit.android.room.track/-remote-audio-track/set-volume.html
• Related: The dev.onvoid.webrtc library may have audio processing capabilities that could be leveraged.