Voice SDK for Flutter
- API Overview
  Agora provides a flexible combination of APIs deployed globally to deliver reliable real-time audio and video communication.
- RtcEngine
  The base interface class of the RTC SDK that implements core real-time audio and video features.
- RtcEngineEx
  Interface class that provides multi-channel methods.
- RtcEngineEventHandler
  The RtcEngineEventHandler interface class is used by the SDK to send event notifications to the app. The app receives SDK event notifications by inheriting the methods of this interface class.
- MediaPlayer
  Class that provides media player functionality and supports multiple instances.
- MediaPlayerCacheManager
  This class provides methods for managing cached media files in the media player.
- MediaPlayerSourceObserver
  Provides callbacks for the media player.
- AudioEncodedFrameObserver
  Observer for encoded audio.
- AudioFrameObserver
  Audio observer.
- AudioFrameObserverBase
  Audio observer.
- MediaPlayerVideoFrameObserver
  Video data observer for the media player.
- VideoEncodedFrameObserver
  Class used to receive encoded video frames.
- VideoFrameObserver
  Video observer.
- AudioSpectrumObserver
  Audio spectrum observer.
- MetadataObserver
  Metadata observer.
- AudioDeviceManager
  Methods for managing audio devices.
- VideoDeviceManager
  Methods for managing video devices.
- MediaEngine
  MediaEngine class.
- DirectCdnStreamingEventHandler
  DirectCdnStreamingEventHandler interface class is used by the SDK to send CDN streaming event notifications to the app. The app receives SDK event notifications by inheriting methods of this interface.
- BaseSpatialAudioEngine
  This class contains some APIs from the LocalSpatialAudioEngine class.
- LocalSpatialAudioEngine
  This class calculates user coordinates through the SDK to implement spatial audio.
- RtcEngineExt
  Derived interface class of RtcEngine.
- MediaPlayerController
  Controller for AgoraVideoView, used to render media player video.

AudioSpectrumObserver

Audio spectrum observer.

onLocalAudioSpectrum

Gets the 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 at the set time interval to report the spectrum of the local audio data before encoding.

Parameters

data: The local user's audio spectrum data. 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 AudioSpectrumObserver and calling enableAudioSpectrumMonitor to enable audio spectrum monitoring, the SDK triggers this callback at the set time interval to report the spectrum of the received remote audio data.

Parameters

spectrums: The audio spectrum information of remote users. See UserAudioSpectrumInfo. The number of elements in the array equals the number of remote users detected by the SDK. An empty array means no remote audio spectrum is detected.
spectrumNumber: The number of remote users.