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.

AudioSpectrumObserver

The audio spectrum observer.

onLocalAudioSpectrum

Gets the statistics of a local audio spectrum.

final void Function(AudioSpectrumData data)? onLocalAudioSpectrum;

After successfully calling registerAudioSpectrumObserver to implement the onLocalAudioSpectrum callback in AudioSpectrumObserver and calling enableAudioSpectrumMonitor to enable audio spectrum monitoring, the SDK triggers this callback as the time interval you set to report the received remote audio data spectrum before encoding.

Parameters

data: The audio spectrum data of the local user. See AudioSpectrumData.

onRemoteAudioSpectrum

Gets the remote audio spectrum.

final void Function(
        List<UserAudioSpectrumInfo> spectrums, int spectrumNumber)?
    onRemoteAudioSpectrum;

After successfully calling registerAudioSpectrumObserver to implement the onRemoteAudioSpectrum callback in the AudioSpectrumObserver and calling enableAudioSpectrumMonitor to enable audio spectrum monitoring, the SDK will trigger the callback as the time interval you set to report the received remote audio data spectrum.

Parameters

spectrums: The audio spectrum information of the remote user, see UserAudioSpectrumInfo. The number of arrays is the number of remote users monitored by the SDK. If the array is null, it means that no audio spectrum of remote users is detected.
spectrumNumber: The number of remote users.