Migration guide

• Migration steps to upgrade your app to Voice Calling v4.x.

• What's changed between Voice Calling v3.7.x and v4.x.

This section introduces the main steps to upgrade the SDK from v3.7.x to 4.x.

1. Integrate the SDK

   See Get started for more information about integrating the 4.x SDK into your project.

2. Rename imported classes

   After successfully integrating the SDK, you need to update the codes of imported classes from the io.agora.rtc prefix to the io.agora.rtc2 prefix in the /app/java/com.example.<projectname>/MainActivity file of your project.

   The file path of ChannelMediaOptions.java in the 4.x SDK is also changed from /models to the root directory.

3. Update the Agora code in your app

   The 4.x SDK has optimized or modified the implementation of some functions, resulting in incompatibility with the v3.7.x SDK. In order to retain Agora functionality in your app, update the code in your app according to What has changed.

This section introduces the main changes of 4.x compared to v3.7.x in the following categories. You need to update the code of your app according to your business scenario.

• Breaking changes: Introduces API compatibility changes that have a big impact. You need to spend significant time modifying the related implementation.

• Behavior changes: Introduces changes caused by reasonable optimization of the SDK default behavior and API behavior. Less time is required to modify the related implementation, if any.

• Function gaps: Introduces functions that were supported in v3.7.x but are not supported in 4.x. However, these functions are intended to be added in a future release.

• Removed APIs: Introduces APIs that were supported in v3.7.x but removed in 4.x. Most of these APIs have alternatives in 4.x. Modifying the related implementation should require less time.

• Naming and data type changes: Introduces the naming and data type changes of the main APIs. You can update the relevant implementation according to the error message in the IDE, which is expected to take less time.

After upgrading from v3.7.x to 4.x, the way the APIs implement some functions is different. This section introduces compatibility changes for these APIs and the logic for updating the code of your app.

In v3.7.x, the SDK provides the RtcChannel and IRtcChannelEventHandler classes to implement multi-channel control. The v3.7.x SDK supports subscribing to the audio and video streams of multiple channels, but only supports publishing one group of audio and video streams in one channel.

4.x introduces the following changes:

• The SDK supports capturing or publishing multiple groups of audio and video streams at the same time. For example, simultaneously publishing video streams captured by multiple cameras or multiple screens.

• The SDK retains the following behavior of RtcEngine: you can call joinChannel (replacing joinChannel of the RtcChannel class in v3.7.x) multiple times, and publish the specified stream to different channels through different user IDs (localUid) and ChannelMediaOptions settings.

• Added a binary group RtcConnection to represent the connection established by joinChannel. A connection is determined by the channel name (channelId) and localUid. You can control the publishing and subscribing state of different connections through RtcConnection. The SDK adds Ex in the name of all APIs with a connection parameter (corresponding to the RtcConnection class) to distinguish them, and gathers these APIs in the IRtcEngineEx class to implement more multi-stream functions.

By setting ChannelMediaOptions, 4.x supports using one RtcEngine instance to capture audio and video streams from multiple sources at the same time and publish them to the remote user, adapting to various business scenarios. For example:

• Simultaneously publish a media player stream, a screen-sharing stream, and a video stream captured by the front and rear cameras.

• Simultaneously publish one audio stream captured by the microphone and one by the custom audio source, and one media player steam.

Combined with the multi-channel capability, you can also experience the following functions:

• Publish multiple groups of audio and video streams to the remote user through different localUids.

• Mix multiple audio streams and publish them to the remote user through one localUid.

• Mix multiple video streams and publish them to the remote user through one localUid.

  RtcChannel and RtcEngine of v3.7.x are partially duplicated and overlap in their functionality, so 4.x hides the RtcChannel and IRtcChannelEventHandler classes. See the JoinMultiChannel sample project for more details on how to replace RtcChannel with joinChannel and ChannelMediaOptions. The expected migration cost is one day or less.

If you need to continue to use the RtcChannel and IRtcChannelEventHandler classes, contact support@agora.io. The decision whether to maintain compatibility in a future release is based on your feedback.

In v3.7.x, the SDK uses the publishLocalAudio and publishLocalVideo members in ChannelMediaOptions to control the audio and video publishing state in the channel.

In 4.x, the SDK gathers more channel-related settings into ChannelMediaOptions, including publishing of audio and video streams from different sources, automatic subscribing of audio and video streams, user role switching, token updating, and default dual stream options. You can determine the media stream publishing and subscribing behavior by calling joinChannel or joinChannelEx when joining a channel, or you can flexibly update the media options by calling updateChannelMediaOptions after joining a channel, such as switching video sources.

See the JoinChannelVideo sample project to update the code in your app.

In v3.7.x, the SDK provides the following ways to implement the custom video source and renderer:

• Push mode for custom video source

• Raw video data mode for custom video renderer

• MediaIO mode (IVideoSource) for custom video source

• MediaIO mode (IVideoSink) for custom video renderer

4.x unifies the audio and video processing pipeline internally. Push mode and raw video data mode are simpler for integration, so Agora recommends using them for custom video source and renderer and removes the following related APIs of the MediaIO mode:

• IVideoSource

• IVideoSink

• IVideoFrameConsumer

• setVideoSource

• setLocalVideoRenderer

• setRemoteVideoRenderer

If you use the MediaIO mode in v3.7.x to implement custom video source, custom video renderer, switching video source, and other functions, Agora recommends updating the code of your app by referring to the following sample projects:

• Custom video source: CustomVideoSourcePush

• Custom video renderer: CustomVideoRender

• Switching video source: ScreenShare

In v3.7.x, the SDK returns error codes and warning codes through the onError and onWarning callbacks.

To facilitate locating and troubleshooting issues, 4.x reports problems and causes through the return values of APIs or different callbacks for listening to states. For example:

• getConnectionState: Reports the network connection state.

• onLocalAudioStateChanged: Reports the local audio state.

• onLocalVideoStateChanged: Reports the local video state.

• onRemoteAudioStateChanged: Reports the remote audio state.

• onRemoteVideoStateChanged: Reports the remote video state.

As a consequence, 4.x removes the onError and onWarning callbacks.

This section introduces changes caused by reasonable optimization of the SDK default behavior and API behavior.

In v3.7.x, the default channel profile is CHANNEL_PROFILE_COMMUNICATION (the communication profile).

Because the interactive live streaming profile supports seamless switching from one-to-one calls to multi-user interaction, since v3.0.0, Agora has changed the internal transmission protocol and the ability to resist poor network conditions in the communication profile to be consistent with the interactive live streaming profile. In 4.x, Agora also changed the default channel profile to CHANNEL_PROFILE_LIVE_BROADCASTING (the interactive live streaming profile).

In v3.7.x, if the uid parameter returned in onNetworkQuality is 0, the callback reports the network quality of the local user. In 4.x, the uid of the local user returned in this callback is the same as the local user’s actual uid in the channel.

In v3.7.x, when the SDK creates multiple log files, the earlier files are named in a agorasdk_x.log format, such as agorasdk_1.log. 4.x modified the naming format to agorasdk.x.log, such as agorasdk.1.log. Additionally, 4.x adds the agoraapi.log file to record API logs.

In v3.7.x, you need to call switchChannel to quickly switch a channel.

In 4.x, you can achieve the same switching speed as switchChannel in v3.7.x by switching a channel through leaveChannel and joinChannel. Therefore, 4.x removes switchChannel. If you call switchChannel to quickly switch a channel in v3.7.x, see the VideoQuickSwitch sample project to update the code in your app.

This section introduces functions that were supported in v3.7.x but are no longer supported or behave inconsistently in 4.x. Plans exist to support them or make them consistent in a future release, however.

reconstructs the audio application scenarios, which can replace most of the audio application scenarios of v3.7.x. The following table shows the correspondence of audio application scenarios in the two releases:

v3.7.x	4.x
AUDIO_SCENARIO_DEFAULT	AUDIO_SCENARIO_DEFAULT
AUDIO_SCENARIO_CHATROOM_ENTERTAINMENT	AUDIO_SCENARIO_CHATROOM
AUDIO_SCENARIO_EDUCATION	AUDIO_SCENARIO_DEFAULT
AUDIO_SCENARIO_GAME_STREAMING	AUDIO_SCENARIO_GAME_STREAMING or AUDIO_SCENARIO_HIGH_DEFINITION
AUDIO_SCENARIO_SHOWROOM	AUDIO_SCENARIO_DEFAULT
AUDIO_SCENARIO_CHATROOM_GAMING	AUDIO_SCENARIO_CHATROOM
AUDIO_SCENARIO_IOT	AUDIO_SCENARIO_DEFAULT
AUDIO_SCENARIO_MEETING	None

The following table shows the differences in the behavior of APIs related to the audio route between v3.7.x and :

API	v3.x	v4.x
setDefaultAudioRouteToSpeakerphone	You can only set the audio route before joining a channel. This method only controls the initial state of the audio route and does not change the default audio route of the system. For example, regardless of whether you set the parameter of setDefaultAudioRouteToSpeakerphone to true or false, calling setEnableSpeakerphone(false) changes the audio route to the earpiece.</li>	You can set the audio route either before or after joining a channel. This method is a steady API and can change the default audio route of the system. For example, after calling setDefaultAudioRouteToSpeakerphone(true) to set the initial audio route to the speakerphone, calling setEnableSpeakerphone(false) cannot change the audio route to the earpiece.</li>
setEnableSpeakerphone	After connecting external playback devices such as Bluetooth and wired headphones, calling setEnableSpeakerphone cannot switch the audio route to the speakerphone or earpiece.	Not recommended.

Also, when an external playback device is removed, for example, by disconnecting the Bluetooth headset, the audio route change is different between v3.5.0 and 4.x:

• In v3.7.x, the audio route changes as follows (in terms of priority): The external device connected next to last (if any) > … > The external device connected first > setEnableSpeakerphone > setDefaultAudioRoutetoSpeakerphone > The default audio route.

• In 4.x, the audio route changes as follows (in terms of priority): The external device connected next to last (if any) > … > The external device connected first > setDefaultAudioRoutetoSpeakerphone > The default audio route.

In v3.7.x, if you set the video bitrate in VideoEncoderConfiguration as STANDARD_BITRATE, the default video bitrate in the CHANNEL_PROFILE_LIVE_BROADCASTING profile is twice that of the CHANNEL_PROFILE_COMMUNICATION profile.

In 4.x, the video bitrate in the CHANNEL_PROFILE_COMMUNICATION profile is the same as that in the CHANNEL_PROFILE_LIVE_BROADCASTING profile, which means the video bitrate in the CHANNEL_PROFILE_COMMUNICATION profile is doubled.

4.x modifies the calling logic of enableVirtualBackground. Before calling enableVirtualBackground, you need to do the following:

1. Call addExtension(agora_segmentation_extension) during RtcEngine initialization to specify the extension’s library path.

2. Call enableExtension("agora_segmentation", "PortraitSegmentation", "true") to enable the extension.

3. Call enableVideo to enable the video module.

See the VideoProcessExtension sample project to update the code in your app.

4.x modifies the calling logic of setBeautyEffectOptions. Before calling setBeautyEffectOptions, you need to do the following:

1. Call addExtension(agora_video_process) during RtcEngine initialization to specify the extension’s library path.

2. Call enableExtension (agora, beauty, true) to enable the extension.

3. Call enableVideo to enable the video module.

See the VideoProcessExtension sample project to update the code in your app.

Compared to v3.7.x, some features are not supported or only partially supported in 4.x. This section shows the APIs currently unsupported but for which support is planned for a future release.

Remote video stream fallback:

• setRemoteUserPriority

• setRemoteSubscribeFallbackOption

• onRemoteSubscribeFallbackToAudioOnly

Raw audio data:

• getObservedAudioFramePosition

• getRecordAudioParams

• getMixedAudioParams

• getPlaybackAudioParams

Raw video data:

• getVideoFormatPreference

Audio and video statistics:

• qualityChangedReason member in RemoteAudioStats

• captureBrightnessLevel member in LocalVideoStats

Network type:

• NETWORK_TYPE_MOBILE_5G in AgoraNetworkType

Audio and video errors:

• LOCAL_VIDEO_STREAM_ERROR_DEVICE_NOT_FOUND(8)

Selecting the playback track of the audio file:

• selectAudioTrack

Pre-call network test: Before supporting the following APIs, you can use startLastmileProbeTest and stopLastmileProbeTest instead.

• enableLastmileTest

• disableLastmileTest

Call loop test:

• startEchoTest (with the config parameter)

Screen sharing:

• startScreenCaptureByDisplayId

• onScreenCaptureInfoUpdated

Audio recording on the client:

• recordingChannel in AudioRecordingConfiguration

• AgoraMediaRecorder

• getMediaRecorder

• startRecording

• stopRecording

• releaseRecorder

• onRecorderStateChanged

• onRecorderInfoUpdated

Wi-Fi acceleration:

• enableWirelessAccelerate

• onWlAccMessage

• onWlAccStats

Video content inspection:

• enableContentInspect

• onContentInspectResult

Cloud proxy connection state:

• onProxyConnected

External audio data:

• pushExternalAudioFrame (with the sourcePos parameter)

• setExternalAudioSourceVolume

The 4.x removes deprecated or unrecommended APIs. Alternatives to the removed API or reasons for their removal are shown as follows:

• setVideoDenoiserOptions, setLowlightEnhanceOptions, and setColorEnhanceOptions: Use setExtensionProperty instead.

• onvirtualBackgroundSourceEnabled: Use the return value of enableVirtualBackground instead.

• onUserSuperResolutionEnabled: Use the RemoteVideoStats member of the superResolutionType class instead.

• setAudioMixingPlaybackSpeed: Use setPlaybackSpeed instead.

• setAudioMixingDualMonoMode: Use setAudioDualMonoMode instead.

• getEffectCurrentPosition: Use getPosition instead.

• setEffectPosition: Use seek instead.

• getEffectDuration：Use getDuration instead.

• setAgoraLibPath: Use the mNativeLibPath member in RtcEngineConfig instead when calling create [2/2].

• getAudioFileInfo and onRequestAudioFileInfo：Use getDuration instead.

• onFirstLocalAudioFrame：Use onFirstLocalAudioFramePublished instead.

• getRecordAudioParams：Use setRecordingAudioFrameParameters instead.

• getMixedAudioParams：Use setMixedAudioFrameParameters instead.

• getPlaybackAudioParams：Use setPlaybackAudioFrameParameters instead.

• The pushMode parameter in setExternalVideoSource: The default value of this parameter is true, and this parameter only takes effect when it is set to true. After deletion, it does not affect the function.

• setLocalPublishFallbackOption and onLocalPublishFallbackToAudioOnly: Rarely used in v3.7.x.

• RENDER_MODE_FILL(4) in RENDER_MODE_TYPE: This mode might cause image overstretch and is not recommended.

• The following enumerations of audio mixing: Rarely used in v3.7.x.

• AUDIO_MIXING_REASON_STARTED_BY_USER

• AUDIO_MIXING_REASON_ONE_LOOP_COMPLETED

• AUDIO_MIXING_REASON_START_NEW_LOOP

• AUDIO_MIXING_REASON_ALL_LOOPS_COMPLETED

• AUDIO_MIXING_REASON_STOPPED_BY_USER

• AUDIO_MIXING_REASON_PAUSED_BY_USER

• AUDIO_MIXING_REASON_RESUMED_BY_USER

• onAudioMixingFinished: Rarely used in v3.7.x.

• The info parameter in joinChannel [2/2]: This parameter is optional and rarely used in v3.7.x.

• enableDeepLearningDenoise: The SDK will add deep-learning noise reduction as one of its capability in a future release instead of implementing through an API.

The naming and data type changes in 4.x cause error messages in the IDE when you compile your project, and you need to update the code of your app according to each error message.

The main API and parameter name changes are as follows:

• adjustLoopbackRecordingSignalVolume is changed to adjustLoopbackRecordingVolume.

• The fileSize member in LogConfig is renamed to fileSizeInKB.

• The options parameter in joinChannel[2/2] is changed to mediaOptions.

• The report_vad parameter in enableAudioVolumeIndication is changed to reportVad.

• registerVideoEncodedFrameObserver is changed to registerVideoEncodedImageReceiver.

The main API data type changes are as follows:

• The state and reason parameters in onRemoteAudioStateChanged are changed from integer to enumeration.

• The oldState and newState parameters in onAudioPublishStateChanged, onVideoPublishStateChanged, onAudioSubscribeStateChanged, and onVideoSubscribeStateChanged are changed from integer to enumeration.

• The state and error parameters in onLocalAudioStateChanged are changed from integer to enumeration.

• The state and error parameters in onRtmpStreamingStateChanged are changed from integer to enumeration