Voice SDK for Flutter
- API Overview
  Agora provides ensured quality of experience (QoE) for worldwide Internet-based voice and video communications through SD-RTN™.
- RtcEngine
  The basic interface of the Agora SDK that implements the core functions of real-time communication.
- RtcEngineEx
  This interface class contains multi-channel methods.
- RtcEngineEventHandler
  The SDK uses the RtcEngineEventHandler interface to send event notifications to your app. Your app can get those notifications through methods that inherit this interface.
- MediaPlayer
  This class provides media player functions and supports multiple instances.
- AudioEncodedFrameObserver
  The encoded audio observer.
- AudioDeviceManager
  Audio device management methods.
- VideoDeviceManager
  Video device management methods.
- MediaEngine
  The MediaEngine class.
- MediaPlayerCacheManager
  This class provides methods to manage cached media files.
- MediaPlayerSourceObserver
  Provides callbacks for media players.
- AudioPcmFrameSink
  This class is used to get raw PCM audio.
- AudioFrameObserverBase
  The audio frame observer.
- AudioSpectrumObserver
  The audio spectrum observer.
- MetadataObserver
  The metadata observer.
- VideoEncodedFrameObserver
  Receives encoded video images.
- VideoFrameObserver
  The IVideoFrameObserver class.
- FaceInfoObserver
  Facial information observer.
- LocalSpatialAudioEngine
  This class calculates user positions through the SDK to implement the spatial audio effect.
- MediaPlayerVideoFrameObserver
  The video frame observer for the media player.
- RtcEngineExt
  The derived interface class from RtcEngine.
- AgoraVideoView
  The AgoraVideoView Class for rendering local and remote video.
- MediaPlayerController
  The AgoraVideoView controller used to render the video for the media player.
- VideoViewController
  A AgoraVideoView controller for rendering local and remote video.
- Class and Enum
  This page lists all the definitions of Class and the enums for Flutter.

MetadataObserver

The metadata observer.

You can call registerMediaMetadataObserver to register or unregister the MetadataObserver object.

onMetadataReceived

Occurs when the local user receives the metadata.

final void Function(Metadata metadata)? onMetadataReceived;

Parameters

metadata: The metadata received. See Metadata.