Releases all IChannel resources.

Returns

• 0: Success.
• < 0: Failure.
  • ERR_NOT_INITIALIZED (7): The SDK is not initialized before calling this method.

Sets the channel event handler.

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

Parameters

channelEh

The event handler of the IChannel object. For details, see IChannelEventHandler.

Returns

• 0: Success.
• < 0: Failure.

Joins the channel with a user ID.

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

Once the user joins the channel, the user subscribes to the audio and video streams of all the other users in the channel by default, giving rise to usage and billing calculation. If you do not want to subscribe to a specified stream or all remote streams, call the mute methods accordingly.

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 IRtcEngine object.

Parameters

token	The token for authentication: 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 Generate a token.
info	(Optional) Additional information about the channel. This parameter can be set as null. Other users in the channel do not receive this information.
uid	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(ERR_OK): Success.
• < 0: Failure.
  • -2(ERR_INALID_ARGUMENT): The parameter is invalid.
  • -3(ERR_NOT_READY): The SDK fails to be initialized. You can try re-initializing the SDK.
  • -5(ERR_REFUSED): The request is rejected. This may be caused by the following:
    • You have created an IChannel object with the same channel name.
    • You have joined and published a stream in a channel created by the IChannel object.

Joins the channel with a user account.

After the user successfully joins the channel, the SDK triggers the following callbacks:

• The local client: onLocalUserRegistered and onJoinChannelSuccess .
• The remote client: onUserJoined and onUserInfoUpdated , if the user joining the channel is in the COMMUNICATION profile, or is a host in the LIVE_BROADCASTING profile.

Once the user joins the channel, the user subscribes to the audio and video streams of all the other users in the channel by default, giving rise to usage and billing calculation. If you do not want to subscribe to a specified stream or all remote streams, call the mute methods accordingly.

Note

To ensure smooth communication, use the same parameter type to identify the user. For example, if a user joins the channel with a user ID, then ensure all the other users use the user ID too. The same applies to the user account. If a user joins the channel with the Agora Web SDK, ensure that the uid of the user is set to the same parameter type.

Parameters

token	The token generated at your server: For low-security requirements: You can use the temporary token generated at Console. For details, see Get a temporary toke. For high-security requirements: 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 the user account is unique and do not set it as null. Supported character scopes are: 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: agora::rtc::ChannelMediaOptions::ChannelMediaOptions “ChannelMediaOptions”.

Returns

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

Allows a user to leave a channel, such as hanging up or exiting a call.

After joining a channel, the user must call the leaveChannel method to end the call before joining another channel.

This method returns 0 if the user leaves the channel and releases all resources related to the call.

This method call is asynchronous, and the user has not left the channel when the method call returns. Once the user leaves the channel, the SDK triggers the onLeaveChannel callback.

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 the Communication channel, or is a host in the LIVE_BROADCASTING profile.

Note

• If you call the release method immediately after the leaveChannel method, the leaveChannel process interrupts, and the onLeaveChannel callback is not triggered.
• If you call the leaveChannel method during a CDN live streaming, the SDK triggers the removePublishStreamUrl method.

Returns

• 0(ERR_OK): Success.
• < 0: Failure.
  • -1(ERR_FAILED): A general error occurs (no specified reason).
  • -2(ERR_INALID_ARGUMENT): The parameter is invalid.
  • -7(ERR_NOT_INITIALIZED): The SDK is not initialized.

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 IChannel object.
• In the interactive live streaming channel, only a host can call this method. To switch the client role, call setClientRole of the current IChannel object.
• You can publish a stream to only one channel at a time. For details on joining multiple channels, 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.

Gets the channel ID of the current IChannel object.

Returns

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

Retrieves the current call ID.

When a user joins a channel on a client, a callId is generated to identify the call from the client. Feedback methods, such as rate and complain, must be called after the call ends to submit feedback to the SDK.

The rate and complain methods require the callId parameter retrieved from the getCallId method during a call. callId is passed as an argument into the rate and complain methods after the call ends.

Note

Ensure that you call this method after joining a channel.

Parameters

callId

The current call ID.

Returns

• 0: Success.
• < 0: Failure.

Gets a new token when the current token expires after a period of time.

The token expires after a period of time once the token schema is enabled when:

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

The application should call this method to get the new token. Failure to do so will result in the SDK disconnecting from the server.

Parameters

token

Pointer to the new token.

Returns

• 0(ERR_OK): Success.
• < 0: Failure.
  • -1(ERR_FAILED): A general error occurs (no specified reason).
  • -2(ERR_INALID_ARGUMENT): The parameter is invalid.
  • -7(ERR_NOT_INITIALIZED): The SDK is not initialized.

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

Deprecated:

Deprecated as of v3.1.0. Use the enableEncryption instead.

All users in a channel must use the same encryption password. The encryption password is automatically cleared once a user leaves the channel.

If an encryption password is not specified, the encryption functionality will be disabled.

Note

• Do not use this method for CDN live streaming.
• 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.

Parameters

secret

Pointer to the encryption password.

Returns

• 0: Success.
• < 0: Failure.

Sets the built-in encryption mode.

Deprecated:

Deprecated as of v3.1.0. Use the enableEncryption instead.

The Agora SDK supports built-in encryption, which is set to the aes-128-xts mode by default. Call this method 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

Call the setEncryptionSecret method to enable the built-in encryption function before calling this method.

Parameters

encryptionMode

The set encryption mode: "aes-128-xts": (Default) 128-bit AES encryption, XTS mode. "aes-128-ecb": 128-bit AES encryption, ECB mode. "aes-256-xts": 256-bit AES encryption, XTS mode. "": When encryptionMode is set as NULL, the encryption mode is set as "aes-128-xts" by default.

Returns

• 0: Success.
• < 0: Failure.

Enables/Disables the built-in encryption.

Since

v3.1.0

In scenarios requiring high security, Agora recommends calling this method to enable the built-in encryption before joining a channel.

All users in the same channel must use the same encryption mode and encryption key. Once all users leave the channel, the encryption key of this channel is automatically cleared.

Note

• If you enable the built-in encryption, you cannot use the RTMP or RTMPS streaming function.
• You need to add an external encryption library when integrating the Android and iOS SDK. See the advanced guide Channel Encryption.

Parameters

enabled	Whether to enable the built-in encryption: true: Enable the built-in encryption. false: Disable the built-in encryption.
config	Configurations of built-in encryption schemas. See EncryptionConfig.

Returns

• 0: Success.
• < 0: Failure.
  • -2(ERR_INVALID_ARGUMENT): An invalid parameter is used. Set the parameter with a valid value.
  • -4(ERR_NOT_SUPPORTED): The encryption mode is incorrect or the SDK fails to load the external encryption library. Check the enumeration or reload the external encryption library.
  • -7(ERR_NOT_INITIALIZED): The SDK is not initialized. Initialize the IChannel instance before calling this method.

Registers a packet observer.

The Agora SDK allows your application to register a packet observer to receive callbacks for voice or video packet transmission.

Note

• The size of the packet sent to the network after processing should not exceed 1200 bytes, otherwise, the packet may fail to be sent.
• Ensure that both receivers and senders call this method, otherwise, you may meet undefined behaviors such as no voice and black screen.
• When you use CDN live streaming, recording or storage functions, Agora doesn't recommend calling this method.
• Call this method before joining a channel.

Parameters

observer

The registered packet observer. See IPacketObserver.

Returns

• 0: Success.
• < 0: Failure.

Registers the metadata observer.

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 interactive live streaming, such as sending shopping links, digital coupons, and online quizzes.

Note

• Call this method before the joinChannel method.
• This method applies to the LIVE_BROADCASTING channel profile.

Parameters

observer	The IMetadataObserver class. See the definition of IMetadataObserver for details.
type	See METADATA_TYPE. The SDK supports VIDEO_METADATA (0) only for now.

Returns

• 0: Success.
• < 0: Failure.

Sets the role of the user, such as a host or an audience (default), before joining a channel in the interactive live streaming.

This method can be used to switch the user role in the interactive live streaming after the user joins a channel.

In the LIVE_BROADCASTING profile, when a user switches user roles after joining a channel, a successful setClientRole method call triggers the following callbacks:

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

Note

This method applies only to the LIVE_BROADCASTING profile.

Parameters

role	Sets the role of the user. See CLIENT_ROLE_TYPE.

Returns

• 0: Success.
• < 0: Failure.

Sets the role of a user in interactive live streaming.

Since

v3.2.0

You can call this method either before or after joining the channel to set the user role as audience or host. If you call this method to switch the user role after joining the channel, the SDK triggers the following callbacks:

• The local client: onClientRoleChanged.
• The remote client: onUserJoined or onUserOffline.

Note

• This method applies to the LIVE_BROADCASTING profile only.
• The difference between this method and setClientRole [1/2] is that this method can set the user level in addition to the user role.
  • The user role determines the permissions that the SDK grants to a user, such as permission to send local streams, receive remote streams, and push streams to a CDN address.
  • The user level determines the level of services that a user can enjoy within the permissions of the user's role. For example, an audience can choose to receive remote streams with low latency or ultra low latency. Levels affect prices.

Parameters

role	The role of a user in interactive live streaming. See CLIENT_ROLE_TYPE.
options	The detailed options of a user, including user level. See ClientRoleOptions.

Returns

• 0(ERR_OK): Success.
• < 0: Failure.
  • -1(ERR_FAILED): A general error occurs (no specified reason).
  • -2(ERR_INALID_ARGUMENT): The parameter is invalid.
  • -7(ERR_NOT_INITIALIZED): The SDK is not initialized.

Prioritizes a remote user's stream.

The SDK ensures the high-priority user gets the best possible stream quality.

Note

• The Agora SDK supports setting serPriority as high for one user only.
• Ensure that you call this method before joining a channel.

Parameters

uid	The ID of the remote user.
userPriority	Sets the priority of the remote user. See PRIORITY_TYPE.

Returns

• 0: Success.
• < 0: Failure.

Sets the sound position and gain 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 speaker.
• Ensure that you call this method after joining a channel.

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.
• < 0: Failure.

Updates the display mode of the video view of a remote user.

After initializing the video view of a remote user, you can call this method to update its rendering and mirror modes. This method affects only the video view that the local user sees.

Note

• Call this method after calling the setupRemoteVideo method to initialize the remote video view.
• During a call, you can call this method as many times as necessary to update the display mode of the video view of a remote user.

Parameters

userId	The ID of the remote user.
renderMode	The rendering mode of the remote video view. See RENDER_MODE_TYPE.
mirrorMode	The mirror mode of the remote video view. See VIDEO_MIRROR_MODE_TYPE. Note: The SDK disables the mirror mode by default.

Returns

• 0: Success.
• < 0: Failure.

Stops or resumes subscribing to the audio streams of all remote users by default.

Deprecated:

This method is deprecated from v3.3.0.

Call this method after joining a channel. After successfully calling this method, the local user stops or resumes subscribing to the audio streams of all subsequent users.

Note

If you need to resume subscribing to the audio streams of remote users in the channel after calling setDefaultMuteAllRemoteAudioStreams (true), do the following:

• If you need to resume subscribing to the audio stream of a specified user, call muteRemoteAudioStream (false), and specify the user ID.
• If you need to resume subscribing to the audio streams of multiple remote users, call muteRemoteAudioStream (false) multiple times.

Parameters

mute	Sets whether to stop subscribing to the audio streams of all remote users by default. true: Stop subscribing to the audio streams of all remote users by default. false: (Default) Resume subscribing to the audio streams of all remote users by default.

Returns

• 0: Success.
• < 0: Failure.

Stops or resumes subscribing to the video streams of all remote users by default.

Deprecated:

This method is deprecated from v3.3.0.

Call this method after joining a channel. After successfully calling this method, the local user stops or resumes subscribing to the video streams of all subsequent users.

Note

If you need to resume subscribing to the video streams of remote users in the channel after calling setDefaultMuteAllRemoteVideoStreams (true), do the following:

• If you need to resume subscribing to the video stream of a specified user, call muteRemoteVideoStream (false), and specify the user ID.
• If you need to resume subscribing to the video streams of multiple remote users, call muteRemoteVideoStream (false) multiple times.

Parameters

mute	Sets whether to stop subscribing to the video streams of all remote users by default. true: Stop subscribing to the video streams of all remote users by default. false: (Default) Resume subscribing to the video streams of all remote users by default.

Returns

• 0: Success.
• < 0: Failure.

Stops or resumes subscribing to the audio streams of all remote users.

As of v3.3.0, after successfully calling this method, the local user stops or resumes subscribing to the audio streams of all remote users, including all subsequent users.

Note

• Call this method after joining a channel.
• See recommended settings in Set the Subscribing State.

Parameters

mute	Sets whether to stop subscribing to the audio streams of all remote users. true: Stop subscribing to the audio streams of all remote users. false: (Default) Resume subscribing to the audio streams of all remote users.

Returns

• 0: Success.
• < 0: Failure.

Adjust the playback signal volume of the specified remote user.

After joining a channel, call adjustPlaybackSignalVolume to adjust the playback volume of different remote users, or adjust multiple times for one remote user.

Note

• Call this method after joining a channel.
• This method adjusts the playback volume, which is the mixed volume for the specified remote user.
• This method can only adjust the playback volume of one specified remote user at a time. If you want to adjust the playback volume of several remote users, call the method multiple times, once for each remote user.

Parameters

userId	The user ID, which should be the same as the uid of joinChannel
volume	The playback volume of the voice. The value ranges from 0 to 100: 0: Mute. 100: Original volume.

Returns

• 0: Success.
• < 0: Failure.

Stops or resumes subscribing to the audio stream of a specified user.

Note

• Call this method after joining a channel.
• See recommended settings in Set the Subscribing State.

Parameters

userId	The user ID of the specified remote user.
mute	Sets whether to stop subscribing to the audio stream of a specified user. true: Stop subscribing to the audio stream of a specified user. false: (Default) Resume subscribing to the audio stream of a specified user.

Returns

• 0: Success.
• < 0: Failure.

Stops or resumes subscribing to the video streams of all remote users.

As of v3.3.0, after successfully calling this method, the local user stops or resumes subscribing to the video streams of all remote users, including all subsequent users.

Note

• Call this method after joining a channel.
• See recommended settings in Set the Subscribing State.

Parameters

mute	Sets whether to stop subscribing to the video streams of all remote users. true: Stop subscribing to the video streams of all remote users. false: (Default) Resume subscribing to the video streams of all remote users.

Returns

• 0: Success.
• < 0: Failure.

Stops or resumes subscribing to the video stream of a specified user.

Note

• Call this method after joining a channel.
• See recommended settings in Set the Subscribing State.

Parameters

userId	The user ID of the specified remote user.
mute	Sets whether to stop subscribing to the video stream of a specified user. true: Stop subscribing to the video stream of a specified user. false: (Default) Resume subscribing to the video stream of a specified 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-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 to the low-video stream. This method allows the app to adjust the corresponding video stream type based on the size of the video window to reduce the bandwidth and resources.

The aspect ratio of the low-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-video stream.

The method result returns in the onApiCallExecuted callback.

Parameters

userId	The ID of the remote user sending the video stream.
streamType	Sets the video-stream type. See REMOTE_VIDEO_STREAM_TYPE.

Returns

• 0: Success.
• < 0: Failure.

Sets the default stream type of remote videos.

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-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 to the low-video stream. This method allows the app to adjust the corresponding video stream type based on the size of the video window to reduce the bandwidth and resources. The aspect ratio of the low-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-video stream.

The method result returns in the onApiCallExecuted callback.

Parameters

streamType

Sets the default video-stream type. See REMOTE_VIDEO_STREAM_TYPE.

Returns

• 0: Success.
• < 0: Failure.

Creates a data stream.

Deprecated:

This method is deprecated from v3.3.0. Use the createDataStream [2/2] method instead.

Each user can create up to five data streams during the lifecycle of the IChannel.

Note

• Do not set reliable as true while setting ordered as false.
• Ensure that you call this method after joining a channel.

Parameters

[out]	streamId	The ID of the created data stream.
	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 stream from the sender within five seconds. If the recipient does not receive the data stream within five seconds, an error is reported to the application. 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	Sets whether or not the recipients receive the data stream in the sent order: true: The recipients receive the data stream in the sent order. false: The recipients do not receive the data stream in the sent order.

Returns

• Returns 0: Success.
• < 0: Failure.

Creates a data stream.

Since

v3.3.0

Each user can create up to five data streams in a single channel.

This method does not support data reliability. If the receiver receives a data packet five seconds or more after it was sent, the SDK directly discards the data.

Parameters

[out]	streamId	The ID of the created data stream.
	config	The configurations for the data stream: DataStreamConfig.

Returns

• 0: Creates the data stream successfully.
• < 0: Fails to create the data stream.

Sends data stream messages to all users in a channel.

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 streams 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 onStreamMessage callback on the remote client.

Note

• This method applies only to the COMMUNICATION profile or to the hosts in the LIVE_BROADCASTING profile. If an audience in the LIVE_BROADCASTING profile calls this method, the audience may be switched to a host.
• Ensure that you have created the data stream using createDataStream before calling this method.

Parameters

streamId	The ID of the sent data stream, returned in the createDataStream method.
data	The sent data.
length	The length of the sent data.

Returns

• 0: Success.
• < 0: Failure.

Publishes the local stream to a specified CDN streaming URL. (CDN live only.)

The SDK returns the result of this method call in the onStreamPublished callback.

After calling this method, you can push media streams in RTMP or RTMPS protocol to the CDN. The SDK triggers the onRtmpStreamingStateChanged callback on the local client to report the state of adding a local stream to the CDN.

Note

• Ensure that the user joins the channel before calling this method.
• Ensure that you enable the RTMP Converter service before using this function. See Prerequisites in the advanced guide Push Streams to CDN.
• This method adds only one stream CDN streaming URL each time it is called.
• Agora supports pushing media streams in RTMPS protocol to the CDN only when you enable transcoding.

Parameters

url	The CDN streaming URL in the RTMP or RTMPS format. The maximum length of this parameter is 1024 bytes. The CDN streaming URL must not contain special characters, such as Chinese language characters.
transcodingEnabled	Sets whether transcoding is enabled/disabled: 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 hosts in CDN live. If you set this parameter as true, ensure that you call the setLiveTranscoding method before this method. false: Disable transcoding.

Returns

• 0: Success.
• < 0: Failure.
  • ERR_INVALID_ARGUMENT (-2): The CDN streaming URL is NULL or has a string length of 0.
  • ERR_NOT_INITIALIZED (-7): You have not initialized IChannel when publishing the stream.

Removes an RTMP or RTMPS stream from the CDN.

This method removes the CDN streaming URL (added by the addPublishStreamUrl method) from a CDN live stream. The SDK returns the result of this method call in the onStreamUnpublished callback.

The removePublishStreamUrl method call triggers the onRtmpStreamingStateChanged callback on the local client to report the state of removing an RTMP or RTMPS stream from the CDN.

Note

• This method removes only one CDN streaming URL each time it is called.
• The CDN streaming URL must not contain special characters, such as Chinese language characters.

Parameters

url	The CDN streaming URL to be removed. The maximum length of this parameter is 1024 bytes.

Returns

• 0: Success.
• < 0: Failure.

Sets the video layout and audio settings for CDN live. (CDN live only.)

The SDK triggers the onTranscodingUpdated callback when you call the setLiveTranscoding method to update the transcoding setting.

Note

• Ensure that you enable the RTMP Converter service before using this function. See Prerequisites in the advanced guide Push Streams to CDN..
• If you call the setLiveTranscoding method to set the transcoding setting for the first time, the SDK does not trigger the onTranscodingUpdated callback.
• Ensure that you call this method after joining a channel.
• Agora supports pushing media streams in RTMPS protocol to the CDN only when you enable transcoding.

Parameters

transcoding

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

Returns

• 0: Success.
• < 0: Failure.

Adds a voice or video stream URL address to the interactive live streaming.

The onStreamPublished callback returns the inject status. If this method call is successful, the server pulls the voice or video stream and injects it into a live channel. This is applicable to scenarios where all audience members in the channel can watch a live show and interact with each other.

The addInjectStreamUrl method call triggers the following callbacks:

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

• The remote client:

  • onUserJoined (uid: 666), if the method call is successful and the online media stream is injected into the channel.

  Note

  • Ensure that you enable the RTMP Converter service before using this function. See Prerequisites in the advanced guide Push Streams to CDN.
  • This method applies to the Native SDK v2.4.1 and later.
  • This method applies to the LIVE_BROADCASTING profile only.
  • You can inject only one media stream into the channel at the same time.
  • Ensure that you call this method after joining a channel.

  Parameters

  url	The URL address to be added to the ongoing live streaming. Valid protocols are RTMP, HLS, and HTTP-FLV. Supported audio codec type: AAC. Supported video codec type: H264 (AVC).
  config	The InjectStreamConfig object that contains the configuration of 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_BROADCASTING. Call the setChannelProfile method and set the channel profile to LIVE_BROADCASTING before calling this method.
    • ERR_NOT_INITIALIZED (-7): The SDK is not initialized. Ensure that the IChannel object is initialized before calling this method.

Removes the voice or video stream URL address from a live streaming.

This method removes the URL address (added by the addInjectStreamUrl method) from the live streaming.

Note

If this method is called successfully, the SDK triggers the onUserOffline callback and returns a stream uid of 666.

Parameters

url	Pointer to the URL address of the added stream 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 return the state and events of the media stream relay.

• If the onChannelMediaRelayStateChanged callback returns RELAY_STATE_RUNNING (2) and RELAY_OK (0), and the onChannelMediaRelayEvent callback returns RELAY_EVENT_PACKET_SENT_TO_DEST_CHANNEL (4), the host starts sending data to the destination channel.
• If the onChannelMediaRelayStateChanged callback returns RELAY_STATE_FAILURE (3), an exception occurs during the media stream relay.

Note

• Call this method after the joinChannel method.
• This method takes effect only when you are a host in a LIVE_BROADCASTING 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.
• Contact sales.nosp@m.-us@.nosp@m.agora.nosp@m..io before implementing this function.
• We do not support string user accounts in this API.

Parameters

configuration

The configuration of the media stream relay: ChannelMediaRelayConfiguration.

Returns

• 0: Success.
• < 0: Failure.

Updates the channels for media stream relay.

After a successful startChannelMediaRelay method call, 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 call, 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.

Parameters

configuration

The media stream relay configuration: ChannelMediaRelayConfiguration.

Returns

• 0: Success.
• < 0: Failure.

Stops the media stream relay.

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

After a successful method call, the SDK triggers the onChannelMediaRelayStateChanged callback. If the callback returns RELAY_STATE_IDLE (0) and RELAY_OK (0), the host 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 by calling the leaveChannel method, and the media stream relay automatically stops.

Returns

• 0: Success.
• < 0: Failure.

Gets the current connection state of the SDK.

Note

You can call this method either before or after joining a channel.

Returns

CONNECTION_STATE_TYPE.