Sets the channel event handler.

After setting the channel event handler, you can listen for channel events and receive the statistics of the corresponding RtcChannel instance.

Parameters

eventHandler

The event handler of the RtcChannel instance: IRtcChannelEventHandler.

Gets the channel event handler.

Returns

• The IRtcChannelEventHandler instance, if the method call succeeds.
• Null, if the method call fails.

Destroys the RtcChannel instance.

Returns

• 0: Success.
• < 0: Fail.
  • ERR_NOT_INITIALIZED(-7): The RtcChannel instance is not initialized before calling this method.

Gets the channel ID of the current RtcChannel instance.

Returns

• The channel ID of the current RtcChannel instance, if the method call succeeds.
• The empty string "", if the method call fails.

Gets the current call ID.

Returns

• The current call ID, if the method call succeeds.
• The empty string "", if the method call fails.

Gets the connection state of the SDK.

Returns

The connection state:

• CONNECTION_STATE_DISCONNECTED(1): The SDK is disconnected from Agora edge server.
• CONNECTION_STATE_CONNECTING(2): The SDK is connecting to Agora edge server.
• CONNECTION_STATE_CONNECTED(3): The SDK joined a channel and is connected to Agora edge server. You can now publish or subscribe to a media stream in the channel.
• CONNECTION_STATE_RECONNECTING(4): The SDK keeps rejoining the channel after being disconnected from a joined channel because of network issues.
• CONNECTION_STATE_FAILED(5): The SDK fails to join the channel.

Joins the channel with a user ID.

This method differs from the joinChannel method in the RtcEngine class in the following aspects:

Note

• If you are already in a channel, you cannot rejoin it with the same uid.
• We recommend using different UIDs for different channels.
• If you want to join the same channel from different devices, ensure that the UIDs in all devices are different.
• Ensure that the app ID you use to generate the token is the same with the app ID used when creating the RtcEngine instance.

Parameters

token	The token generated at your server: In situations not requiring high security: You can use the temporary token generated at Console. For details, see Get a temporary token. In situations requiring high security: Set it as the token generated at your server. For details, see Get a token.
optionalInfo	Additional information about the channel. This parameter can be set as null. Other users in the channel do not receive this information.
optionalUid	The user ID. A 32-bit unsigned integer with a value ranging from 1 to (232-1). This parameter must be unique. If uid is not assigned (or set as 0), the SDK assigns a uid and reports it in the onJoinChannelSuccess callback. The app must maintain this user ID.
options	The channel media options: ChannelMediaOptions.

Returns

• 0: Success.
• < 0: Failure.
  • ERR_INVALID_ARGUMENT(-2)
  • ERR_NOT_READY(-3)
  • ERR_REFUSED(-5)

Joins a channel with the user account.

This method differs from the joinChannelWithUserAccount method in the RtcEngine class in the following aspects:

Note

• If you are already in a channel, you cannot rejoin it with the same uid.
• We recommend using different user accounts for different channels.
• If you want to join the same channel from different devices, ensure that the user accounts in all devices are different.
• Ensure that the app ID you use to generate the token is the same with the app ID used when creating the RtcEngine instance.

Parameters

token	The token generated at your server: In situations not requiring high security: You can use the temporary token generated at Console. For details, see Get a temporary token. In situations requiring high security: Set it as the token generated at your server. For details, see Get a token.
userAccount	The user account. The maximum length of this parameter is 255 bytes. Ensure that you set this parameter and do not set it as null. All lowercase English letters: a to z. All uppercase English letters: A to Z. All numeric characters: 0 to 9. The space character. Punctuation characters and other symbols, including: "!", "#", "$", "%", "&", "(", ")", "+", "-", ":", ";", "<", "=", ".", ">", "?", "@", "[", "]", "^", "_", " {", "}", "|", "~", ",".
options	The channel media options: ChannelMediaOptions.

Returns

• 0: Success.
• < 0: Failure.
  • ERR_INVALID_ARGUMENT(-2)
  • ERR_NOT_READY(-3)
  • ERR_REFUSED(-5)

Leaves the current channel.

A successful leaveChannel method call triggers the following callbacks:

• The local client: onLeaveChannel.
• The remote client: onUserOffline, if the user leaving the channel is in a Communication channel, or is a broadcaster in a Live-Broadcast channel.

Returns

• 0: Success.
• < 0: Failure.

Publishes the local stream to the channel.

You must keep the following restrictions in mind when calling this method. Otherwise, the SDK returns the ERR_REFUSED(-5)：

• This method publishes one stream only to the channel corresponding to the current RtcChannel instance.
• In a Live-Broadcast channel, only a broadcaster can call this method. To switch the client role, call setClientRole of the current RtcChannel instance.
• You can publish a stream to only one channel at a time. For details, see the advanced guide Join Multiple Channels.

  Returns

• 0: Success.
• < 0: Failure.
  • ERR_REFUSED(-5): The method call is refused.

Stops publishing a stream to the channel.

If you call this method in a channel where you are not publishing streams, the SDK returns ERR_REFUSED(-5).

Returns

• 0: Success.
• < 0: Failure.
  • ERR_REFUSED(-5): The method call is refused.

Renews the token when the current token expires.

In the following situations, the SDK decides that the current token has expired:

• The SDK triggers the onTokenPrivilegeWillExpire callback, or
• The onConnectionStateChanged callback reports the CONNECTION_CHANGED_TOKEN_EXPIRED(9) error.

You should get a new token from your server and call this method to renew it. Failure to do so results in the SDK disconnecting from the Agora server.

Parameters

token

The new token.

Returns

• 0: Success.
• < 0: Failure.

Enables built-in encryption with an encryption password before joining a channel.

All users in a channel must set the same encryption password. The encryption password is automatically cleared once a user leaves the channel. If the encryption password is not specified or set to empty, the encryption functionality is disabled.

Note

• For optimal transmission, ensure that the encrypted data size does not exceed the original data size + 16 bytes. 16 bytes is the maximum padding size for AES encryption.
• Do not use this method for CDN streaming.

Parameters

secret

The encryption password.

Returns

• 0: Success.
• < 0: Failure.

Sets the built-in encryption mode.

The Agora SDK supports built-in encryption, which is set to aes-128-xts mode by default. Call this method to set the encryption mode to use other encryption modes. All users in the same channel must use the same encryption mode and password.

Refer to the information related to the AES encryption algorithm on the differences between the encryption modes.

Note

• Do not use this method for CDN streaming.
• Before calling this method, ensure that you have called setEncryptionSecret to enable encryption.

Parameters

encryptionMode

Sets the encryption mode: "aes-128-xts": 128-bit AES encryption, XTS mode. "aes-128-ecb": 128-bit AES encryption, ECB mode. "aes-256-xts": 256-bit AES encryption, XTS mode. "": (Default) When encryptionMode is set as the empty string, the encryption is in “aes-128-xts” by default.

Returns

• 0: Success.
• < 0: Failure.

Registers the metadata observer.

You need to implement the IMetadataObserver class and specify the metadata type in this method. A successful call of this method triggers the getMaxMetadataSize callback.

This method enables you to add synchronized metadata in the video stream for more diversified live broadcast interactions, such as sending shopping links, digital coupons, and online quizzes.

Note

• Call this method before the joinChannel method.
• This method applies to the Live-Broadcast profile only.

Parameters

observer	The IMetadataObserver class.
type	The metadata type. Currently, the SDK supports VIDEO_METADATA(0) only. UNKNOWN_METADATA(-1): the metadata type is unknown. VIDEO_METADATA(0): the metadata type is video.

Returns

• 0: Success.
• < 0: Failure.

Sets the role of a user.

This method sets the role of a user, such as a host or an audience. In a Live-Broadcast channel, only a broadcaster can call the publish method in the RtcChannel class.

A successful call of this method triggers the following callbacks:

• The local client: onClientRoleChanged.
• The remote client: onUserJoined or onUserOffline(USER_OFFLINE_BECOME_AUDIENCE).

Parameters

role	The role of the user: CLIENT_ROLE_BROADCASTER(1): Broadcaster. CLIENT_ROLE_AUDIENCE(2): Audience.

Returns

• 0: Success.
• < 0: Failure.

Sets the priority of a remote user's media stream.

Use this method with the setRemoteSubscribeFallbackOption method. If a remote video stream experiences the fallback, the SDK ensures the high-priority user gets the best possible stream quality.

Note

The Agora SDK supports setting userPriority as high for one user only.

Parameters

uid	The ID of the remote user.
userPriority	The priority of the remote user: USER_PRIORITY_HIGH(50): The user's priority is high. USER_PRIORITY_NORMAL(100): (Default) The user's priority is normal.

Returns

• 0: Success.
• < 0: Failure.

Sets the sound position of a remote user.

When the local user calls this method to set the sound position of a remote user, the sound difference between the left and right channels allows the local user to track the real-time position of the remote user, creating a real sense of space. This method applies to massively multiplayer online games, such as Battle Royale games.

Note

• For this method to work, enable stereo panning for remote users by calling the enableSoundPositionIndication method before joining a channel.
• This method requires hardware support. For the best sound positioning, we recommend using a stereo headset.

Parameters

uid	The ID of the remote user.
pan	The sound position of the remote user. The value ranges from -1.0 to 1.0: 0.0: The remote sound comes from the front. -1.0: The remote sound comes from the left. 1.0: The remote sound comes from the right.
gain	Gain of the remote user. The value ranges from 0.0 to 100.0. The default value is 100.0 (the original gain of the remote user). The smaller the value, the less the gain.

Returns

• 0: Success.
• -1: Failure.

Updates the remote video display mode.

This method can be called multiple times during a call to change the display mode.

Parameters

uid	ID of the remote user.
renderMode	The remote video render mode: RENDER_MODE_HIDDEN(1): Uniformly scale the video until it fills the visible boundaries (cropped). One dimension of the video may have clipped contents. RENDER_MODE_FIT(2): Uniformly scale the video until one of its dimension fits the boundary (zoomed to fit). Areas that are not filled due to the disparity in the aspect ratio are filled with black. RENDER_MODE_ADAPTIVE(3): This mode is deprecated and Agora does not recommend using this mode.
mirrorMode	The remote video render mode: VIDEO_MIRROR_MODE_AUTO(0): (Default) The SDK determines the mirror mode. The SDK disables the mirror mode by default. VIDEO_MIRROR_MODE_ENABLED(1): Enable the mirror mode. VIDEO_MIRROR_MODE_DISABLED(2): Disable the mirror mode.

Returns

• 0: Success.
• < 0: Failure.

Sets whether to receive all remote audio streams by default.

Parameters

muted

Determines whether to receive/stop receiving all remote audio streams by default: true: Stop receiving all remote audio streams by default. false: (Default) Receive all remote audio streams by default.

Returns

• 0: Success.
• < 0: Failure.

Sets whether to receive all remote video streams by default.

Parameters

muted

Determines whether to receive/stop receiving all remote video streams by default: true: Stop receiving all remote video streams by default. false: (Default) Receive all remote video streams by default.

Returns

• 0: Success.
• < 0: Failure.

Stops/Resumes receiving all remote audio streams.

Parameters

muted

Determines whether to receive/stop receiving all remote audio streams: true: Stop receiving all remote audio streams. false: (Default) Receive all remote audio streams.

Returns

• 0: Success.
• < 0: Failure.

Adjusts the playback volume of a specified remote user.

You can call this method as many times as necessary to adjust the playback volume of different remote users, or to repeatedly adjust the playback volume of the same remote user.

Note

• Call this method after joining a channel.
• The playback volume here refers to the mixed volume of a specified remote user.
• This method can only adjust the playback volume of one specified remote user at a time. To adjust the playback volume of different remote users, call the method as many times, once for each remote user.

Parameters

uid	ID of the remote user.
volume	The playback volume of the specified remote user. The value ranges from 0 to 100: 0: Mute. 100: The original volume.

Returns

• 0: Success.
• < 0: Failure.

Stops/Resumes receiving the audio stream of the specified user.

Parameters

uid	ID of the remote user whose audio stream you want to mute.
muted	Determines whether to receive/stop receiving the audio stream of the specified user: true: Stop receiving the audio stream of the user. false: (Default) Receive the audio stream of the user.

Returns

• 0: Success.
• < 0: Failure.

Stops/Resumes receiving all remote video streams.

Parameters

muted

Determines whether to receive/stop receiving all remote video streams: true: Stop receiving all remote video streams. false: (Default) Receive all remote video streams.

Returns

• 0: Success.
• < 0: Failure.

Stops/Resumes receiving the video stream of the specified user.

Parameters

uid	ID of the remote user whose video stream you want to mute.
muted	Determines whether to receive/stop receiving the video stream of the specified user: true: Stop receiving the video stream of the user. false: (Default) Receive the video stream of the user.

Returns

• 0: Success.
• < 0: Failure.

Sets the stream type of the remote video.

Under limited network conditions, if the publisher has not disabled the dual-stream mode using enableDualStreamMode(false), the receiver can choose to receive either the high-quality video stream (the high resolution, and high bitrate video stream) or the low-quality video stream (the low resolution, and low bitrate video stream).

By default, users receive the high-quality video stream. Call this method if you want to switch the remote stream type to reduce the bandwidth and resources.

The aspect ratio of the low-quality video stream is the same as the high-quality video stream. Once the resolution of the high-quality video stream is set, the system automatically sets the resolution, frame rate, and bitrate of the low-quality video stream.

The SDK reports the result of calling this method in the onApiCallExecuted callback.

Parameters

uid	ID of the remote user sending the video stream.
streamType	Sets the video stream type: VIDEO_STREAM_HIGH(0): High-resolution, high-bitrate video. VIDEO_STREAM_LOW(1): Low-resolution, high-bitrate video.

Returns

• 0: Success.
• < 0: Failure.

Sets the default video-stream type of the remote video stream when the remote user sends dual streams.

Parameters

streamType

Sets the video stream type: VIDEO_STREAM_HIGH(0): High-resolution, high-bitrate video. VIDEO_STREAM_LOW(1): Low-resolution, high-bitrate video.

Returns

• 0: Success.
• < 0: Failure.

Creates a data stream.

Each user can create up to five data streams during the life cycle of the RtcChannel instance.

Parameters

reliable

Sets whether or not the recipients are guaranteed to receive the data stream from the sender within five seconds: true: The recipients receive the data from the sender within five seconds. If the recipient does not receive the data within five seconds, the SDK triggers the onStreamMessageError callback and returns an error code. false: There is no guarantee that the recipients receive the data stream within five seconds and no error message is reported for any delay or missing data stream.

ordered

Determines whether or not the recipients receive the data stream in the sent order: true: The recipients receive the data in the sent order. false: The recipients do not receive the data in the sent order.

Note

Set both the reliable and ordered parameters to true or false. Do not set one as true and the other as false.

Returns

• The stream ID, if the method call succeeds.
• The negative integer, if the method call fails.

Sends the data stream message.

The SDK has the following restrictions on this method:

• Up to 30 packets can be sent per second in a channel with each packet having a maximum size of 1 KB.
• Each client can send up to 6 KB of data per second.
• Each user can have up to five data channels simultaneously.

A successful sendStreamMessage method call triggers the onStreamMessage callback on the remote client, from which the remote user gets the stream message.

A failed sendStreamMessage method call triggers the onStreamMessageError callback on the remote client.

Parameters

streamId	ID of the sent data stream returned by the createDataStream method.
message	The message data in byte[].

Returns

• 0: Success.
• < 0: Failure.

Publishes the local stream to the CDN.

This method call triggers the onRtmpStreamingStateChanged callback on the local client to report the state of adding a local stream to the CDN.

Parameters

url	The CDN streaming URL in the RTMP format. The maximum length of this parameter is 1024 bytes. The URL address must not contain special characters, such as Chinese language characters.
transcodingEnabled	Sets whether transcoding is enabled/disabled. If you set this parameter as true, ensure that you call the setLiveTranscoding method before this method. true: Enable transcoding to transcode the audio or video streams when publishing them to CDN live, often used for combining the audio and video streams of multiple broadcasters in CDN live. false: Disable transcoding.

Note

• Ensure that you enable the RTMP Converter service before using this function. See Prerequisites in Push Streams to CDN.
• Ensure that the user joins a channel before calling this method.
• This method can only be called by a broadcaster in a Live-Broadcast channel.
• This method adds only one stream HTTP/HTTPS URL address each time it is called.

Returns

• 0: Success.
• < 0: Failure.
  • ERR_INVALID_ARGUMENT(2): Invalid parameter, usually because the URL address is null or the string length is 0.
  • ERR_NOT_INITIALIZED(7): You have not initialized RtcChannel when publishing the stream.

Removes an RTMP stream from the CDN.

This method removes the RTMP URL address (added by addPublishStreamUrl) from a CDN live stream. The SDK reports the result of this method call in the onRtmpStreamingStateChanged callback.

Note

• Ensure that you enable the RTMP Converter service before using this function. See Prerequisites in Push Streams to CDN.
• This method can only be called by a broadcaster in a Live-Broadcast channel.
• This method removes only one stream HTTP/HTTPS URL address each time it is called.

Parameters

url	The RTMP URL address to be removed. The maximum length of this parameter is 1024 bytes. The URL address must not contain special characters, such as Chinese language characters.

Returns

• 0: Success.
• < 0: Failure.

Sets the video layout and audio settings for CDN live.

The SDK triggers the onTranscodingUpdated callback when you call this method to update the LiveTranscodingclass. If you call this method to set the LiveTranscoding class for the first time, the SDK does not trigger the onTranscodingUpdated callback.

Note

• Ensure that you enable the RTMP Converter service before using this function. See Prerequisites in Push Streams to CDN.
• Ensure that the user joins a channel before calling this method.
• This method can only be called by a broadcaster in a Live-Broadcast channel.
• Ensure that you call this method before calling the addPublishStreamUrl method.

Parameters

transcoding

Sets the CDN live audio/video transcoding settings: LiveTranscoding.

Returns

• 0: Success.
• < 0: Failure.

Injects an online media stream to a Live-Broadcast channel.

If this method call succeeds, the server pulls the voice or video stream and injects it into a live channel. This applies to scenarios where all audience members in the channel can watch a live show and interact with each other.

Note

• Ensure that you enable the RTMP Converter service before using this function. See Prerequisites in Push Streams to CDN.
• This method can only be called by a broadcaster in a Live-Broadcast channel.

Calling this method triggers the following callbacks:

• The local client:
  • onStreamInjectedStatus, with the state of injecting the media stream.
  • onUserJoined(uid: 666), if the method call succeeds and the online media stream is injected into the channel.
• The remote client:
  • onUserJoined(uid: 666), if the method call succeeds and the online media stream is injected into the channel.

Parameters

url	The URL address to be added to the ongoing live broadcast. Valid protocols are RTMP, HLS, and FLV. Supported FLV audio codec type: AAC. Supported FLV video codec type: H264(AVC).
config	The LiveInjectStreamConfig object, which contains the configuration information for the added voice or video stream.

Returns

• 0: Success.
• < 0: Failure.
  • ERR_INVALID_ARGUMENT(2): The injected URL does not exist. Call this method again to inject the stream and ensure that the URL is valid.
  • ERR_NOT_READY(3): The user is not in the channel.
  • ERR_NOT_SUPPORTED(4): The channel profile is not Live-Broadcast.
  • ERR_NOT_INITIALIZED(7): The SDK is not initialized. Ensure that the RtcChannel instance is initialized before using this method.

Removes the injected online media stream from a Live-Broadcast channel.

This method removes the URL address added by addInjectStreamUrl.

If you successfully remove the URL address from the Live-Broadcast, the SDK triggers the onUserJoined callback, with the stream uid of 666.

Parameters

url	The URL address to be removed.

Returns

• 0: Success.
• < 0: Failure.

Starts to relay media streams across channels.

After a successful method call, the SDK triggers the onChannelMediaRelayStateChanged and onChannelMediaRelayEvent callbacks, and these callbacks report the state and events of the media stream relay.

• If the onChannelMediaRelayStateChanged callback reports RELAY_STATE_RUNNING(2) and RELAY_OK(0), and the onChannelMediaRelayEvent callback reports RELAY_EVENT_PACKET_SENT_TO_DEST_CHANNEL(4), the SDK starts relaying media streams between the original and the destination channel.
• If the onChannelMediaRelayStateChanged callback returns RELAY_STATE_FAILURE(3), an exception occurs during the media stream relay.

Note

• Contact suppo.nosp@m.rt@a.nosp@m.gora..nosp@m.io before implementing this function.
• Call this method after joining the channel.
• This method can only be called by a broadcaster in a Live-Broadcast channel.
• After a successful method call, if you want to call this method again, ensure that you call the stopChannelMediaRelay method to quit the current relay.

Parameters

channelMediaRelayConfiguration

The configuration of the media stream relay: ChannelMediaRelayConfiguration.

Returns

• 0: Success.
• < 0: Failure.

Stops the media stream relay.

Once the relay stops, the broadcaster quits all the destination channels.

After a successful method call, the SDK triggers the onChannelMediaRelayStateChanged callback. If the callback reports RELAY_STATE_IDLE(0) and RELAY_OK(0), the broadcaster successfully stops the relay.

Note

If the method call fails, the SDK triggers the onChannelMediaRelayStateChanged callback with the RELAY_ERROR_SERVER_NO_RESPONSE(2) or RELAY_ERROR_SERVER_CONNECTION_LOST(8) state code. You can leave the channel using leaveChannel, and the media stream relay automatically stops.

Returns

• 0: Success.
• < 0: Failure.

Updates the channels for media relay.

After the channel media relay starts, if you want to relay the media stream to more channels, or leave the current relay channel, you can call the updateChannelMediaRelay method.

After a successful method, the SDK triggers the onChannelMediaRelayEvent callback with the RELAY_EVENT_PACKET_UPDATE_DEST_CHANNEL(7) state code.

Note

• Call this method after the startChannelMediaRelay method to update the destination channel.
• This method supports adding at most four destination channels in the relay. If there are already four destination channels in the relay, remove the unnecessary ones with the removeDestChannelInfo method in ChannelMediaRelayConfiguration before calling this method.

Parameters

channelMediaRelayConfiguration

The media stream relay configuration: ChannelMediaRelayConfiguration.

Returns

• 0: Success.
• < 0: Failure.

Customizes the remote video renderer for the RtcChannel object.

Since

3.0.1

During real-time engagements, the Agora SDK enables the default video sink to render the video. In the multi-channel scenario, if you want to customize the video renderer, you can create a customized video sink using the IVideoSink class, and call setRemoteVideoRenderer to add the customized sink into the RtcChannel object.

Parameters

uid	The ID of the remote user.
render	The customized remote video renderer: IVideoSink.

Returns

• 0: Success.
• < 0: Failure.