Skip to main content

Release notes

If your target platform is Android 12 or higher, add the android.permission.BLUETOOTH_CONNECT permission to the AndroidManifest.xml file of the Android project to enable the Bluetooth function of the Android system:


v4.0.1 was released on September 29, 2022.

New features

1. In-ear monitoring

This release adds getEarMonitoringAudioParams callback to set the audio data format of the in-ear monitoring. You can use your own audio effect processing module to pre-process the audio frame data of the in-ear monitoring to implement custom audio effects. After calling registerAudioFrameObserver to register the audio observer, set the audio data format in the return value of the getEarMonitoringAudioParams callback. The SDK calculates the sampling interval based on the return value of the callback, and triggers the onEarMonitoringAudioFrame callback based on the sampling interval.

2. Audio capture device test

This release adds support for testing local audio capture devices before joining channel. You can call startRecordingDeviceTest to start the audio capture device test. After the test is complete, call the stopPlaybackDeviceTest method to stop the audio capture device test.

3. Local network connection types

To make it easier for users to know the connection type of the local network at any stage, this release adds the getNetworkType method. You can use this method to get the type of network connection in use, including UNKNOWN, DISCONNECTED, LAN, WIFI, 2G, 3G, 4G, 5G. When the local network connection type changes, the SDK triggers the onNetworkTypeChanged callback to report the current network connection type.

4. Audio stream filter

This release introduces filtering audio streams based on volume. Once this function is enabled, the Agora server ranks all audio streams by volume and transports 3 audio streams with the highest volumes to the receivers by default. The number of audio streams to be transported can be adjusted; you can contact to adjust this number according to your scenarios.

Meanwhile, Agora supports publishers to choose whether or not the audio streams being published are to be filtered based on volume. Streams that are not filtered will bypass this filter mechanism and transported directly to the receivers. In scenarios where there are a number of publishers, enabling this function helps reducing the bandwidth and device system pressure for the receivers.

To enable this function, contact

5. Spatial audio effect

This release adds the following features applicable to spatial audio effect scenarios, which can effectively enhance the user's sense of presence experience in virtual interactive scenarios.

  • Sound insulation area: You can set a sound insulation area and sound attenuation parameter by calling setZones. When the sound source (which can be a user or the media player) and the listener belong to the inside and outside of the sound insulation area, the listner experiences an attenuation effect similar to that of the sound in the real environment when it encounters a building partition. You can also set the sound attenuation parameter for the media player and the user, respectively, by calling setPlayerAttenuation and setRemoteAudioAttenuation, and specify whether to use that setting to force an override of the sound attenuation paramter in setZones.
  • Doppler sound: You can enable Doppler sound by setting the enable_doppler parameter in SpatialAudioParams, and the receiver experiences noticeable tonal changes in the event of a high-speed relative displacement between the source source and receiver (such as in a racing game scenario).
  • Headphone equalizer: You can use a preset headphone equalization effect by calling the setHeadphoneEQPreset method to improve the hearing of the headphones.

Issues fixed

This release fixed the following issues.

  1. In online meeting scenarios, the local user and the remote user might not hear each other after the local user is interrupted by a call.
  2. After calling setCloudProxy to set the cloud proxy, calling joinChannelEx to join multiple channels failed.

API changes


  • getEarMonitoringAudioParams
  • stopRecordingDeviceTest
  • stopRecordingDeviceTest
  • getNetworkType
  • isAudioFilterable in the ChannelMediaOptions
  • setZones
  • setPlayerAttenuation
  • setRemoteAudioAttenuation
  • muteRemoteAudioStream
  • SpatialAudioParams
  • setHeadphoneEQPreset


  • startEchoTest [2/3]


v4.0.0 was released on September 15, 2022.

Compatibility changes

1. Integration change

This release has optimized the implementation of some features, resulting in incompatibility with v3.7.x. The following are the main features with compatibility changes:

  • Multiple channel
  • Media stream publishing control
  • Warning codes

After upgrading the SDK, you need to update the code in your app according to your business scenarios. For details, see Migrate from v3.7.x to v4.x.

2. Callback exception handling

To facilitate troubleshooting, as of this release, the SDK no longer catches exceptions that are thrown by your own code implementation when triggering callbacks in the IRtcEngineEventHandler class. You need to catch and handle the exceptions yourself; otherwise, it can cause a crash.

New features

1. Multiple media tracks

This release supports one RtcEngine instance to collect multiple audio sources at the same time and publish them to the remote users by setting RtcEngineEx and ChannelMediaOptions.

After calling joinChannel to join the first channel, call joinChannelEx multiple times to join multiple channels, and publish the specified stream to different channels through different user ID (localUid) and ChannelMediaOptions settings.

You can also experience the following features with the multi-channel capability:

  • Publish multiple sets of audio streams to the remote users through different user IDs (uid).
  • Mix multiple audio streams and publish to the remote users through a user ID (uid).

2. Agora media player

To make it easier for users to integrate the Agora SDK and reduce the SDK's package size, this release introduces the Agora media player. After calling the createMediaPlayer method to create a media player object, you can then call the methods in the IMediaPlayer class to experience a series of functions, such as playing local and online media files, preloading a media file, changing the CDN route for playing according to your network conditions, or sharing the audio streams being played with remote users.

3. Brand-new AI Noise Suppression

The SDK supports a new version of AI noise reduction (in comparison to the basic AI noise reduction in v3.7.x). The new AI noise reduction has better vocal fidelity, cleaner noise suppression, and adds a dereverberation option. To enable this feature, contact

4. Ultra-high audio quality

To make the audio clearer and restore more details, this release adds the ULTRA_HIGH_QUALITY_VOICE enumeration. In scenarios that mainly feature the human voice, such as chat or singing, you can call setVoiceBeautifierPreset and use this enumeration to experience ultra-high audio quality.

5. Spatial audio

This feature is in experimental status. To enable this feature, contact Contact technical support if needed.

You can set the spatial audio for the remote user as following:

  • Local Cartesian Coordinate System Calculation: This solution uses the ILocalSpatialAudioEngine class to implement spatial audio by calculating the spatial coordinates of the remote user. You need to call updateSelfPosition and updateRemotePosition to update the spatial coordinates of the local and remote users, respectively, so that the local user can hear the spatial audio effect of the remote user. Spatial effect

You can also set the spatial audio for the media player as following:

  • Local Cartesian Coordinate System Calculation: This solution uses the ILocalSpatialAudioEngine class to implement spatial audio. You need to call updateSelfPosition and updatePlayerPositionInfo to update the spatial coordinates of the local user and media player, respectively, so that the local user can hear the spatial audio effect of media player. Spatial effect

6. Real-time chorus

This release gives real-time chorus the following abilities:

  • Two or more choruses are supported.
  • Each singer is independent of each other. If one singer fails or quits the chorus, the other singers can continue to sing.
  • Very low latency experience. Each singer can hear each other in real time, and the audience can also hear each singer in real time.

This release adds the AUDIO_SCENARIO_CHORUS enumeration. With this enumeration, users can experience ultra-low latency in real-time chorus when the network conditions are good.

7. Extensions from the Agora extensions marketplace

In order to enhance the real-time audio interactive activities based on the Agora SDK, this release supports the one-stop solution for the extensions from the Agora extensions marketplace:

  • Easy to integrate: The integration of modular functions can be achieved simply by calling an API, and the integration efficiency is improved by nearly 95%.
  • Extensibility design: The modular and extensible SDK design style endows the Agora SDK with good extensibility, which enables developers to quickly build real-time interactive apps based on the Agora extensions marketplace ecosystem.
  • Build an ecosystem: A community of real-time audio and video apps has developed that can accommodate a wide range of developers, offering a variety of extension combinations. After integrating the extensions, developers can build richer real-time interactive functions. For details, see Use an Extension.
  • Become a vendor: Vendors can integrate their products with Agora SDK in the form of extensions, display and publish them in the Agora extensions marketplace, and build a real-time interactive ecosystem for developers together with Agora. For details on how to develop and publish extensions, see Become a Vendor.

8. Enhanced channel management

To meet the channel management requirements of various business scenarios, this release adds the following functions to the ChannelMediaOptions structure:

  • Sets or switches the publishing of multiple audio sources.
  • Sets or switches channel profile and user role.
  • Controls audio publishing delay.

Set ChannelMediaOptions when calling joinChannel or joinChannelEx to specify the publishing and subscription behavior of a media stream, for example, whether to subscribe to the audio streams of remote users. After joining the channel, call updateChannelMediaOptions to update the settings in ChannelMediaOptions at any time, for example, to switch the published audio sources.

9. Subscription allowlists and blocklists

This release introduces subscription allowlists and blocklists for remote audio streams. You can add a user ID that you want to subscribe to in your allowlist, or add a user ID for the streams you do not wish to see to your blocklists. You can experience this feature through the following APIs, and in scenarios that involve multiple channels, you can call the following methods in the RtcEngineEx interface:

  • setSubscribeAudioBlacklist:Set the audio subscription blocklist.
  • setSubscribeAudioWhitelist:Set the audio subscription allowlist.

If a user is added in a blocklist and a allowlist at the same time, only the blocklist takes effect.

10. Set audio scenarios

To make it easier to change audio scenarios, this release adds the setAudioScenario method. For example, if you want to change the audio scenario from AUDIO_SCENARIO_DEFAULT to AUDIO_SCENARIO_GAME_STREAMING when you are in a channel, you can call this method.


1. Fast channel switching

This release can achieve the same switching speed as switchChannel in v3.7.x through the leaveChannel and joinChannel methods so that you don't need to take the time to call the switchChannel method.

2. Voice pitch of the local user This release adds voicePitch in AudioVolumeInfo of onAudioVolumeIndication. You can use voicePitch to get the local user's voice pitch and perform business functions such as rating for singing.

3. Device permission management

This release adds the onPermissionError method, which is automatically reported when the audio capture device or camera does not obtain the appropriate permission. You can enable the corresponding device permission according to the prompt of the callback.