This document provides a detailed description that makes it easy for Android voice chat developers to debug and integrate the APIs for Tencent Cloud’s Game Multimedia Engine (GME).

Note：

This document applies to GME SDK v2.8.

Key Considerations for Using GME

GME provides two services: voice chat service and voice message and speech-to-text service, both of which rely on key APIs such as Init and Poll.

Note on Init API

If you need to use voice chat and voice message services at the same time, you only need to call Init API once.

Directions

Important notes

• Configure your project before using GME; otherwise, the SDK will not take effect.
• After a GME API is called successfully, QAVError.OK will be returned with the value being 0.
• GME APIs should be called in the same thread.
• The Poll API should be called periodically for GME to trigger event callbacks.
• For detailed error code, please see Error CodesErrorCode.

Voice chat for Android class

Class	Description
ITMGContext	Key APIs
ITMGRoom	Room APIs
ITMGRoomManager	Room management APIs
ITMGAudioCtrl	Audio APIs
ITMGAudioEffectCtrl	Sound effect and accompaniment APIs

Key APIs

Before the initialization, the SDK is in the uninitialized status, and you need to initialize it through the Init API before you can use the voice chat and speech-to-text services.

You need to call the Init API before calling any APIs of GME.

If you have any questions when using the service, please see General FAQs.

API	Description
Init	Initializes GME
Poll	Triggers event callback
Pause	Pauses the system
Resume	Resumes the system
Uninit	Uninitializes GME

Note：

If you need to switch the account, please call UnInit to uninitialize the SDK.

Getting singleton

To use the voice feature, get the ITMGContext object first.

Sample code

import com.tencent.TMG.ITMGContext; 
ITMGContext.getInstance(this);

Registering callback

The API class uses the Delegate method to send callback notifications to the application. Register the callback function to the SDK for receiving callback messages.

Function prototype

static public abstract class ITMGDelegate {
  public void OnEvent(ITMG_MAIN_EVENT_TYPE type, Intent data){}
}

Override this callback function in the constructor to process the parameters of the callback.

Parameter	Type	Description
type	ITMGContext.ITMG_MAIN_EVENT_TYPE	Event type in the callback response
data	Intent message type	Callback message, i.e., event data

Sample code

private ITMGContext.ITMGDelegate itmgDelegate = null;
itmgDelegate = new ITMGContext.ITMGDelegate() {
@Override
public void OnEvent(ITMGContext.ITMG_MAIN_EVENT_TYPE type, Intent data) {
    if (ITMGContext.ITMG_MAIN_EVENT_TYPE.ITMG_MAIN_EVENT_TYPE_ENTER_ROOM == type)
    {
        // Analyze the returned result
        int nErrCode = data.getIntExtra("result" , -1);
        String strErrMsg = data.getStringExtra("error_info");
}
}
}

Register the callback function to the SDK before room entry.

Function prototype

public abstract int SetTMGDelegate(ITMGDelegate delegate);

Parameter	Type	Description
delegate	ITMGDelegate	SDK callback function

Sample code

ITMGContext.GetInstance(this).SetTMGDelegate(itmgDelegate);

Initializing SDK

• This API is used to initialize the GME service. It is recommended to call it when initializing the application.
• For more information on how to get the sdkAppId parameter, please see Voice Service Activation Guide.
• The OpenID uniquely identifies a user with the rules stipulated by the application developer and unique in the application (currently, only INT64 is supported).

Note：

• The SDK must be initialized before a user can enter a voice chat room.
• The Init API must be called in the same thread with other APIs. It is recommended to call all APIs in the main thread.

Function prototype

public abstract int Init(String sdkAppId, String openId);

Parameter	Type	Description
sdkAppId	String	AppId provided by the GME service from the Tencent Cloud console
OpenId	String	OpenId can only be in Int64 type, which is passed after being converted to a string.

Returned Value	Description
QAVError.OK= 0	Initialized SDK successfully
AV_ERR_SDK_NOT_FULL_UPDATE=7015	Checks whether the SDK file is complete. It is recommended to delete it and then import the SDK again.

The returned value AV_ERR_SDK_NOT_FULL_UPDATE is only a reminder but will not cause an initialization failure.

• If this error is reported during integration, please check the integrity and version of the SDK file as prompted.
• If this error is returned after executable file export, please ignore it and try to avoid displaying it in the UI.

Sample code

String sdkAppID = "14000xxxxx";
String openID = "100";
int ret = ITMGContext.GetInstance(this).Init(sdkAppId, openId);
if(ret != 0){
Log.e(TAG,"SDK initialization failed");
}

Triggering event callback

Event callbacks can be triggered by periodically calling the Poll API in update. The Poll API should be called periodically for GME to trigger event callbacks; otherwise, the entire SDK service will run exceptionally.
Refer to the EnginePollHelper.java file in Demo.

Function prototype

public abstract int Poll();

Sample code

private Handler mhandler = new Handler();private Runnable mRunnable = new Runnable() {    @Override    public void run() {        if (s_pollEnabled) {            if (ITMGContext.GetInstance(null) != null)                ITMGContext.GetInstance(null).Poll();        }        mhandler.postDelayed(mRunnable, 33);    }};

Pausing the system

When a Pause event occurs in the system, the engine should also be notified for pause.
If you need to pause the audio when switching to the background, you can call the Pause API in the listening code used to switch to the background, and call the Resume API in the listening event used to resume the foreground.

Function prototype

public abstract int Pause();

Resuming the system

When a Resume event occurs in the system, the engine should also be notified for resumption. The Resume API only supports resuming voice chat.

Function prototype

public abstract int Resume();

Uninitializing SDK

This API is used to uninitialize the SDK to make it uninitialized. Switching accounts requires uninitialization.

Function prototype

public abstract int Uninit();

Voice Chat

Voice chat refers to the one-to-one or one-to-many real-time voice call feature.

Voice chat flowchart

Voice Chat Room APIs

You should initialize and call the SDK to enter a room before voice chat can start.
If you have any questions when using the service, please see FAQs About Voice Chat.

API	Description
GenAuthBuffer	Initializes authentication
EnterRoom	Enters room
IsRoomEntered	Indicates whether room entry is successful
ExitRoom	Exits room
ChangeRoomType	Modifies user's room audio type
GetRoomType	Gets user's room audio type

Voice chat room call flowchart

Authentication information

Generate AuthBuffer for encryption and authentication of relevant features. For release in the production environment, please use the backend deployment key as detailed in Authentication Key.

Function prototype

AuthBuffer public native byte[] genAuthBuffer(int sdkAppId, String roomId, String openId, String key)

Parameter	Type	Description
appId	int	AppId from the Tencent Cloud console.
roomId	string	Room ID, which can contain up to 127 characters.
openId	string	User ID, which is the same as OpenId during initialization.
key	string	Permission key from the Tencent Cloud console.

Sample code

import com.tencent.av.sig.AuthBuffer;// Header file
byte[] authBuffer = AuthBuffer.getInstance().genAuthBuffer(Integer.parseInt(sdkAppId), strRoomID,openId, key);

Entering a room

When a user enters a room with the generated authentication information, the ITMG_MAIN_EVENT_TYPE_ENTER_ROOM message will be received as a callback. Mic and speaker are not enabled by default after room entry. The returned value of AV_OK indicates a success.

The audio type of the room is determined by the first user to enter the room. After that, if a member in the room changes the room type, it will take effect for all members there. For example, if the first user entering the room uses the smooth sound quality, and the second user entering the room uses the HD sound quality, the room audio type of the second user will become smooth sound quality. Only when a member in the room calls the ChangeRoomType API, the audio type of the room will be changed.

For more information on how to choose a room audio type, please see Sound Quality Selection.

Function prototype

public abstract int EnterRoom(String roomID, int roomType, byte[] authBuffer);

Parameter	Type	Description
roomId	String	Room ID, which can contain up to 127 characters
roomType	int	Room audio type
authBuffer	byte[]	Authentication code

Sample code

ITMGContext.GetInstance(this).EnterRoom(roomId,roomType, authBuffer);    

Callback for room entry

After the user enters the room, the message ITMG_MAIN_EVENT_TYPE_ENTER_ROOM will be sent and identified in the OnEvent function for callback and processing. A successful callback means that the room entry is successful, and the billing starts.

Function prototype

private ITMGContext.ITMGDelegate itmgDelegate = null;
itmgDelegate= new ITMGContext.ITMGDelegate() {
          @Override
        public void OnEvent(ITMGContext.ITMG_MAIN_EVENT_TYPE type, Intent data) {
              }
};

Sample code

Sample code for processing the callback, including room entry and network disconnection events.

public void OnEvent(ITMGContext.ITMG_MAIN_EVENT_TYPE type, Intent data) {
if (ITMGContext.ITMG_MAIN_EVENT_TYPE.ITMG_MAIN_EVENT_TYPE_ENTER_ROOM == type)
      {
             //Analyze the returned result
          int nErrCode = data.getIntExtra("result" , -1);
          String strErrMsg = data.getStringExtra("error_info");
           if (nErrCode == AVError.AV_OK)
          {
              //If you receive a success response for room entry, you can proceed with your operation
              ScrollView_ShowLog("EnterRoom success");
              Log.i(TAG,"EnterRoom success!");
          }
          else
          {
              //If you fail to enter the room, you need to analyze the returned error message
              ScrollView_ShowLog("EnterRoom fail :" + strErrMsg);
              Log.i(TAG,"EnterRoom fail!");
          }  
      }
if (ITMGContext.ITMG_MAIN_EVENT_TYPE.ITMG_MAIN_EVENT_TYPE_ROOM_DISCONNECT == type)
      {
    //waiting timeout, please check your network
}
}

Data details

Message	Data	Sample
ITMG_MAIN_EVENT_TYPE_ENTER_ROOM	result; error_info	{"error_info":"","result":0}
ITMG_MAIN_EVENT_TYPE_ROOM_DISCONNECT	result; error_info	{"error_info":"waiting timeout, please check your network","result":0}

If the network is disconnected, there will be a disconnected callback prompt ITMG_MAIN_EVENT_TYPE.ITMG_MAIN_EVENT_TYPE_ROOM_DISCONNECT. At this time, the SDK will automatically reconnect, and the callback is ITMG_MAIN_EVENT_TYPE_RECONNECT_START. When the reconnection is successful, there will be a callback ITMG_MAIN_EVENT_TYPE_RECONNECT_SUCCESS.

Error codes

Error Code Value	Cause and Suggested Solution
7006	Authentication failed The AppID does not exist or is incorrect. An error occurred while authenticating the authbuff. Authentication expired. The OpenId does not meet the specification.
7007	Already in another room.
1001	The user was already in the process of entering a room but repeated this operation. It is recommended not to call the room entering API until the room entry callback is returned.
1003	The user was already in the room and called the room entering API again.
1101	Make sure that the SDK is initialized, OpenId complies with the rules, the APIs are called in the same thread, and the Poll API is called normally.

Exiting the room

This API is called to exit the current room. It is an async API. The returned value of AV_OK indicates a successful async delivery.

Note：

If there is a scenario in the application where room entry is performed immediately after room exit, you don't need to wait for the RoomExitComplete callback notification from the ExitRoom API during API call; instead, you can directly call the API.

Function prototype

public abstract int ExitRoom();

Sample code

ITMGContext.GetInstance(this).ExitRoom();

Callback for room exit

After the user exits a room, a callback will be returned with the message being ITMG_MAIN_EVENT_TYPE_EXIT_ROOM.

Sample code

public void OnEvent(ITMGContext.ITMG_MAIN_EVENT_TYPE type, Intent data) {
if (ITMGContext.ITMG_MAIN_EVENT_TYPE.ITMG_MAIN_EVENT_TYPE_EXIT_ROOM == type)
    {
        // Receive the event of successful room exit
    }
}

Data details

Message	Data	Sample
ITMG_MAIN_EVENT_TYPE_EXIT_ROOM	result; error_info	{"error_info":"","result":0}

Determining whether user has entered room

This API is used to determine whether the user has entered a room. A bool-type value will be returned. The call is invalid during the process of room entry.

Function prototype

public abstract boolean IsRoomEntered();

Sample code

ITMGContext.GetInstance(this).IsRoomEntered();

Switching room

User can call this API to quickly switch the voice chat room after entering the room. After the room is switched, the device is not reset, that is, if the microphone is already enabled in this room, the microphone will keep enabled after the room is switched.

The callback for quickly switching rooms is ITMG_MAIN_EVENT_TYPE.ITMG_MAIN_EVENT_TYPE_SWITCH_ROOM, and the fields are error_info and result.

API prototype

public abstract int SwitchRoom(String targetRoomID, byte[] authBuffer);

Type descriptions

Parameter	Type	Description
targetRoomID	String	ID of the room to enter
authBuffer	byte[]	Generates a new authentication with the ID of the room to enter

Callback sample code

if(ITMGContext.ITMG_MAIN_EVENT_TYPE.ITMG_MAIN_EVENT_TYPE_SWITCH_ROOM == type) {    
int result = data.getIntExtra("result", 1);    
String errorInfo = data.getStringExtra("error_info");         
if (result == 0) {              
    Toast.makeText(getActivity(), "switch room success.", Toast.LENGTH_SHORT).show();     
    } 
else {              
    Toast.makeText(getActivity(), "switch room failed.. error info=" + errorInfo, Toast.LENGTH_SHORT).show();         
    }
}

Cross-room mic connection

Call this API to connect the microphones across rooms after the room entry. After the call, the local user can communicate with the target OpenID user in the target room.

API prototype

/// <summary> Enable the room sharing, and connect the mic of the OpenID in another room.</summary>
public abstract int StartRoomSharing(String targetRoomID, String targetOpenID, byte[] authBuffer);
/// <summary> Stop the enabled room sharing.</summary>
public abstract int StopRoomSharing();

Type descriptions

Parameter	Type	Description
targetRoomID	String	ID of the room to connect mic
targetOpenID	String	The target OpenID to connect mic
authBuffer	byte[]	Reserved flag. You just need to enter NULL.

Sample code

if (mSwtichRoomShareStart.isChecked())
  {
      String strRoomID = mEditRoomShareRoomID.getText().toString();
      String strOpenID = mEditRoomShareOpenID.getText().toString();
      int nRet = ITMGContext.GetInstance(getActivity()).GetRoom().StartRoomSharing(strRoomID, strOpenID, null);
      if (nRet != 0)
          {
              Toast.makeText(getActivity(), String.format("StartRoomSharing failed nRet=" + nRet), Toast.LENGTH_SHORT).show();
          }else
          {
              int nRet = ITMGContext.GetInstance(getActivity()).GetRoom().StopRoomSharing();
                  if (nRet != 0)
                      {
                          Toast.makeText(getActivity(), String.format("StopRoomSharing failed nRet=" + nRet), Toast.LENGTH_SHORT).show();
                      }
              }
}

Member status change

This API is used to obtain the user speaking in the room and display it in the UI, and to send a notification when someone entering or exiting the room.

Notification for this event will be sent only when the status changes. To get member status in real time, cache the notification when it is received at a higher layer. The event message is ITMG_MAIN_EVNET_TYPE_USER_UPDATE, where the data contains event_id and user_list. The event message will be identified in the OnEvent function.
Notifications for audio events are subject to a threshold, and a notification will be sent only when this threshold is exceeded. The notification "A member has stopped sending audio packets" will be sent if no audio packets are received in more than two seconds.

event_id	Description	Maintenance
ITMG_EVENT_ID_USER_ENTER	A member enters the room	Member list
ITMG_EVENT_ID_USER_EXIT	A member exits the room	Member list
ITMG_EVENT_ID_USER_HAS_AUDIO	A member sends audio packets. This event can be used to determine whether a user is speaking and display the voiceprint effect. It can be called together with getRecvStreamLevel.	Chat member list
ITMG_EVENT_ID_USER_NO_AUDIO	A member stops sending audio packets	Chat member list

Room member maintenance flowchart

Sample code

public void OnEvent(ITMGContext.ITMG_MAIN_EVENT_TYPE type, Intent data) {
if (ITMGContext.ITMG_MAIN_EVENT_TYPE.ITMG_MAIN_EVNET_TYPE_USER_UPDATE == type)
      {
// Update member status
int nEventID = data.getIntExtra("event_id", 0);
String[] openIdList =data.getStringArrayExtra("user_list");
 switch (nEventID)
        {
            case ITMG_EVENT_ID_USER_ENTER:
                // A member enters the room
                break;
            case ITMG_EVENT_ID_USER_EXIT:
                // A member exits the room
                break;
            case ITMG_EVENT_ID_USER_HAS_AUDIO:
                //A member sends audio packets
                break;
            case ITMG_EVENT_ID_USER_NO_AUDIO:
                //A member stops sending audio packets
                break;
            default:
                break;
        }
}
}

Data details

Message	Data	Sample
ITMG_MAIN_EVNET_TYPE_USER_UPDATE	event_id; user_list	{"event_id":0,"user_list":""}

Muting in a room

This API is used to add an ID to the audio data blocklist. This operation blocks audio from someone and only applies to the local device. A returned value of 0 indicates the call is successful. Assume that users A, B, and C are all speaking using their mic in a room:

• If A blocks C, A can only hear B;
• If B blocks neither A nor C, B can hear both of them;
• If C blocks neither A nor B, C can hear both of them.

This API is suitable for scenarios where a user is muted in a room.

Function prototype

public abstract int AddAudioBlackList(String openId);

Parameter	Type	Description
openId	String	ID to be blocked

Sample code

ITMGContext.GetInstance(this).GetAudioCtrl().AddAudioBlackList(openId);

Unmuting

This API is used to remove an ID from the audio data blacklist. A returned value of 0 indicates the call is successful.

Function prototype

public abstract int RemoveAudioBlackList(String openId);

Parameter	Type	Description
openId	String	ID to be unblocked

Sample code

ITMGContext.GetInstance(this).GetAudioCtrl().RemoveAudioBlackList(openId);

Voice Chat Audio APIs

Notes on voice chat audio connection

The voice chat APIs can only be called after SDK initialization and room entry.
When Enable/Disable Mic/Speaker is clicked on the UI, the following practices are recommended:

• For most game applications, it is recommended to call the EnableMic and EnableSpeaker APIs, which is equivalent to calling the EnableAudioCaptureDevice/EnableAudioSend and EnableAudioPlayDevice/EnableAudioRecv APIs.
• For other mobile applications (such as social networking applications), enabling/disabling a capturing device will restart both capturing and playback devices. If the application is playing back background music, it will also be interrupted. Playback will not be interrupted if the mic is enabled/disabled through control of upstreaming/downstreaming. Calling method: call EnableAudioCaptureDevice(true) and EnableAudioPlayDevice(true) once after room entry, and call EnableAudioSend/Recv to send/receive audio streams when Enable/Disable Mic is clicked.
• For more information on how to release only a capturing or playback device, please see the EnableAudioCaptureDevice and EnableAudioPlayDevice.
• Call the pause API to pause the audio engine and call the resume API to resume the audio engine.

Voice chat audio APIs

API	Description
EnableMic	Enables/disables mic
GetMicState	Gets mic status
EnableAudioCaptureDevice	Enables/disables capturing device
IsAudioCaptureDeviceEnabled	Gets capturing device status
EnableAudioSend	Enables/disables audio upstreaming
IsAudioSendEnabled	Gets audio upstreaming status
GetMicLevel	Gets real-time mic volume
GetSendStreamLevel	Gets real-time audio upstreaming volume
SetMicVolume	Sets mic volume
GetMicVolume	Gets mic volume
EnableSpeaker	Enables/disables speaker
GetSpeakerState	Gets speaker status
EnableAudioPlayDevice	Enables/disables playback device
IsAudioPlayDeviceEnabled	Gets playback device status
EnableAudioRecv	Enables/disables audio downstreaming
IsAudioRecvEnabled	Gets audio downstreaming status
GetSpeakerLevel	Gets real-time speaker volume
GetRecvStreamLevel	Gets real-time downstreaming audio levels of other members in room
SetSpeakerVolume	Sets speaker volume
GetSpeakerVolume	Gets speaker volume
EnableLoopBack	Enables/disables in-ear monitoring

Voice Chat Capturing APIs

Enabling or disabling the microphone

This API is used to enable/disable the mic. Mic and speaker are not enabled by default after room entry.
If accompaniment is used, please call this API as instructed in Accompaniment in Voice Chat.

EnableMic = EnableAudioCaptureDevice + EnableAudioSend

Function prototype

public abstract int EnableMic(boolean isEnabled);

Parameter	Type	Description
isEnabled	boolean	To enable the mic, set this parameter to true; otherwise, set it to false.

Sample code

// Enable mic
ITMGContext.GetInstance(this).GetAudioCtrl().EnableMic(true);

Getting the mic status

This API is used to get the mic status. The returned value 0 indicates that the mic is off, while 1 is on.

Function prototype

public abstract int GetMicState();

Sample code

int micState = ITMGContext.GetInstance(this).GetAudioCtrl().GetMicState();

Enabling or disabling capturing device

This API is used to enable/disable a capturing device. The device is not enabled by default after room entry.

• This API can only be called after room entry. The device will be disabled automatically after room exit.
• Operations such as permission application and volume type adjustment will generally be performed when a capturing device is enabled on a mobile device.

Function prototype

public abstract int EnableAudioCaptureDevice(boolean isEnabled);

Parameter	Type	Description
isEnabled	boolean	To enable a capturing device, set this parameter to true; otherwise, set it to false.

Sample code

// Enable capturing device
ITMGContext.GetInstance(this).GetAudioCtrl().EnableAudioCaptureDevice(true);

Getting the capturing device status

This API is used to get the status of a capturing device.

Function prototype

public abstract boolean IsAudioCaptureDeviceEnabled();

Sample code

bool IsAudioCaptureDevice = ITMGContext.GetInstance(this).GetAudioCtrl().IsAudioCaptureDeviceEnabled();

Enabling or disabling audio upstreaming

This API is used to enable/disable audio upstreaming. If a capturing device is already enabled, it will send captured audio data; otherwise, it will remain mute. For more information on how to enable/disable the capturing device, please see the EnableAudioCaptureDevice API.

Function prototype

public abstract int EnableAudioSend(boolean isEnabled);

Parameter	Type	Description
isEnabled	boolean	To enable audio upstreaming, set this parameter to true; otherwise, set it to false.

Sample code

ITMGContext.GetInstance(this).GetAudioCtrl().EnableAudioSend(true);

Getting audio upstreaming status

This API is used to get the status of audio upstreaming.

Function prototype

public abstract boolean IsAudioSendEnabled();

Sample code

bool IsAudioSend = ITMGContext.GetInstance(this).GetAudioCtrl().IsAudioSendEnabled();

Getting the real-time mic volume

This API is used to get the real-time mic volume. An int-type value in the range of 0-100 will be returned. It is recommended to call this API once every 20 ms.

This API is not applicable to the voice message service.

Function prototype

public abstract int GetMicLevel();

Sample code

int micLevel = ITMGContext.GetInstance(this).GetAudioCtrl().GetMicLevel();

Getting the real-time audio upstreaming volume

This API is used to get the local real-time audio upstreaming volume. An int-type value in the range of 0-100 will be returned.

This API is not applicable to the voice message service.

Function prototype

ITMGContext TMGAudioCtrl int GetSendStreamLevel()

Sample code

int Level = ITMGContext.GetInstance(this).GetAudioCtrl().GetSendStreamLevel();

Setting the mic software volume

This API is used to set the mic volume. The corresponding parameter is volume, which is equivalent to attenuating or gaining the captured sound. 0 indicates that the audio is mute, while 100 indicates that the volume remains unchanged. The default value is 100.

This API is not applicable to the voice message service.

Function prototype

public abstract int SetMicVolume(int volume);

Parameter	Type	Description
volume	int	Sets volume. Value range: 0-200

Sample code

ITMGContext.GetInstance(this).GetAudioCtrl().SetMicVolume(volume);

Getting the mic software volume

This API is used to obtain the microphone volume. An "int" value is returned. Value 101 represents API SetMicVolume has not been called.

This API is not applicable to the voice message service.

Function prototype

public abstract int GetMicVolume();

Sample code

ITMGContext.GetInstance(this).GetAudioCtrl().GetMicVolume();

Voice Chat Playback APIs

Enabling or disabling the speaker

This API is used to enable/disable the speaker.
If accompaniment is used, please call this API as instructed in Accompaniment in Voice Chat.

EnableSpeaker = EnableAudioPlayDevice + EnableAudioRecv

Function prototype

public abstract int EnableSpeaker(boolean isEnabled);

Parameter	Type	Description
isEnabled	boolean	To disable the speaker, set this parameter to false; otherwise, set it to true.

Sample code

// Enable the speaker
ITMGContext.GetInstance(this).GetAudioCtrl().EnableSpeaker(true);

Getting the speaker status

This API is used to get the speaker status.

• 0 indicates that the speaker is off.
• 1 indicates that the speaker is on.
• 2 indicates that the speaker is being manipulated.

Function prototype

public abstract int GetSpeakerState();

Sample code

int micState = ITMGContext.GetInstance(this).GetAudioCtrl().GetSpeakerState();

Enabling or disabling playback device

This API is used to enable/disable a playback device.

Function prototype

public abstract int EnableAudioPlayDevice(boolean isEnabled);

Parameter	Type	Description
isEnabled	boolean	To disable a playback device, set this parameter to false; otherwise, set it to true.

Sample code

// Enable the playback device
ITMGContext.GetInstance(this).GetAudioCtrl().EnableAudioPlayDevice(true);

Getting the playback device status

This API is used to get the status of a playback device.

Function prototype

public abstract boolean IsAudioPlayDeviceEnabled();

Sample code

bool IsAudioPlayDevice = ITMGContext.GetInstance(this).GetAudioCtrl().IsAudioPlayDeviceEnabled();

Enabling or disabling audio downstreaming

This API is used to enable/disable audio downstreaming. If a playback device is already enabled, it will play back audio data from other members in the room; otherwise, it will remain mute. For more information on how to enable/disable the playback device, please see the EnableAudioPlayDevice API.

Function prototype

public abstract int EnableAudioRecv(boolean isEnabled);

Parameter	Type	Description
isEnabled	boolean	To enable audio downstreaming, set this parameter to true; otherwise, set it to false.

Sample code

ITMGContext.GetInstance(this).GetAudioCtrl().EnableAudioRecv(true);

Getting audio downstreaming status

This API is used to get the status of audio downstreaming.

Function prototype

public abstract boolean IsAudioRecvEnabled();

Sample code

bool IsAudioRecv = ITMGContext.GetInstance(this).GetAudioCtrl().IsAudioRecvEnabled();

Getting the real-time speaker volume

This API is used to get the real-time speaker volume. An int-type value will be returned to indicate the volume. It is recommended to call this API once every 20 ms.

Function prototype

public abstract int GetSpeakerLevel();

Sample code

int SpeakLevel = ITMGContext.GetInstance(this).GetAudioCtrl().GetSpeakerLevel();

Getting the real-time downstreaming audio levels of other members in room

This API is used to get the real-time audio downstreaming volume of other members in the room. An int-type value will be returned. Value range: 0-200.

Function prototype

public abstract int GetRecvStreamLevel(String openId);

Parameter	Type	Description
openId	string	openId of another member in the room

Sample code

int Level = ITMGContext.GetInstance(this).GetAudioCtrl().GetRecvStreamLevel(openId);

Setting the speaker volume

This API is used to set the speaker volume.
The corresponding parameter is volume. 0 indicates that the audio is mute, while 100 indicates that the volume remains unchanged. The default value is 100.

Function prototype

public abstract int SetSpeakerVolume(int volume);

Parameter	Type	Description
volume	int	Sets volume. Value range: 0-200

Sample code

int speVol = (int)(value * 100);ITMGContext.GetInstance(this).GetAudioCtrl().SetSpeakerVolume(volume);

Getting the speaker volume

This API is used to get the speaker volume. An int-type value will be returned to indicate the volume. 101 indicates that the SetSpeakerVolume API has not been called.
"Level" indicates the real-time volume, and "Volume" the speaker volume. The final volume = Level * Volume%. For example, if the "Level" is 100 and "Volume" is 60, the final volume is "60".

Function prototype

public abstract int GetSpeakerVolume();

Sample code

ITMGContext.GetInstance(this).GetAudioCtrl().GetSpeakerVolume();

Advanced APIs

Enabling in-ear monitoring

This API is used to enable in-ear monitoring. You need to call EnableLoopBack+EnableSpeaker before you can hear your own voice.

Function prototype

public abstract int EnableLoopBack(boolean enable);

Parameter	Type	Description
enable	boolean	Specifies whether to enable in-ear monitoring.

Sample code

ITMGContext.GetInstance(this).GetAudioCtrl().EnableLoopBack(true);

Modifying user's room audio type

This API is used to modify a user's room audio type. For the result, please see the callback event. The event type is ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_TYPE. The audio type of the room is determined by the first user to enter the room. After that, if a member in the room changes the room type, it will take effect for all members there.

Function prototype

public abstract int ChangeRoomType(int nRoomType);

Parameter	Type	Description
nRoomType	int	Target room type to be switched to. For room audio types, please see the EnterRoom API.

Sample code

ITMGContext.GetInstance(this).GetRoom().ChangeRoomType(nRoomType);

Getting user's room audio type

This API is used to get a user's room audio type. The returned value is the room audio type. Value 0 indicates that an error occurred while getting the user's room audio type. For room audio types, please see the EnterRoom API.

Function prototype

public abstract int GetRoomType();

Sample code

ITMGContext.GetInstance(this).GetRoom().GetRoomType();

Callback for modifying the room type

After the room type is set, the event message ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_TYPE will be returned in the callback. The returned parameters include result, error_info, and new_room_type. The new_room_type represents the following information. The event message will be identified in the OnEvent function.

Event Subtype	Parameter	Description
ITMG_ROOM_CHANGE_EVENT_ENTERROOM	1	Indicates that the existing audio type is inconsistent with and changed to that of the entered room.
ITMG_ROOM_CHANGE_EVENT_START	2	Indicates that a user is already in the room and the audio type starts changing (e.g., calling the ChangeRoomType API to change the audio type).
ITMG_ROOM_CHANGE_EVENT_COMPLETE	3	Indicates that a user is already in the room and the audio type has been changed.
ITMG_ROOM_CHANGE_EVENT_REQUEST	4	Indicates that a room member calls the ChangeRoomType API to request a change of room audio type.

Sample code

public void OnEvent(ITMGContext.ITMG_MAIN_EVENT_TYPE type, Intent data) {if (ITMGContext.ITMG_MAIN_EVENT_TYPE.ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_TYPE == type)        {// Process the room type events }}

Data details

Message	Data	Sample
ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_TYPE	result;error_info;new_room_type;subEventType	{"error_info":"","new_room_type":0,"subEventType":0,"result":0}

The monitoring event of room call quality

The message for quality monitoring event triggered once every two seconds after room entry is ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_QUALITY. The returned parameters include weight, loss, and delay, which represent the following information.

This API is used to monitor the network quality. If the user's network is poor, the business layer will remind the user to switch to a better network through the UI.

Parameter	Type	Description
weight	int	Value range: 1-50. 50 indicates excellent sound quality, 1 indicates very poor (barely usable) sound quality, and 0 represents an initial meaningless value. Generally, if the value is below 30, the business layer will remind users that the network is poor and recommend them to switch the network.
loss	double	Upstream packet loss rate
delay	int	Voice chat delay in ms

Getting version number

This API is used to get the SDK version number for analysis.

Function prototype

public abstract String GetSDKVersion();

Sample code

ITMGContext.GetInstance(this).GetSDKVersion();

Checking mic permission

This API is used to return the mic permission status.

Function prototype

public abstract ITMG_RECORD_PERMISSION  CheckMicPermission();

Parameter description

Parameter	Value	Description
ITMG_PERMISSION_GRANTED	0	Mic permission is granted.
ITMG_PERMISSION_Denied	1	Mic is disabled.
ITMG_PERMISSION_NotDetermined	2	No authorization box has been popped up to request the permission.
ITMG_PERMISSION_ERROR	3	An error occurred while calling the API.

Sample code

ITMGContext.GetInstance(this).CheckMicPermission();

Setting log printing level

This API is used to set the level of logs to be printed, and needs to be called before the initialization. It is recommended to keep the default level.

Function prototype

public abstract int SetLogLevel(int levelWrite, int levelPrint);

Parameter description

Parameter	Type	Description
levelWrite	ITMG_LOG_LEVEL	Sets the level of logs to be written. TMG_LOG_LEVEL_NONE indicates not to write. Default value: TMG_LOG_LEVEL_INFO
levelPrint	ITMG_LOG_LEVEL	Sets the level of logs to be printed. TMG_LOG_LEVEL_NONE indicates not to print. Default value: TMG_LOG_LEVEL_ERROR

ITMG_LOG_LEVEL	Description
TMG_LOG_LEVEL_NONE	Does not print logs
TMG_LOG_LEVEL_ERROR	Prints error logs (default)
TMG_LOG_LEVEL_INFO	Prints info logs
TMG_LOG_LEVEL_DEBUG	Prints debug logs
TMG_LOG_LEVEL_VERBOSE	Prints verbose logs

Sample code

ITMGContext.GetInstance(this).SetLogLevel(TMG_LOG_LEVEL_INFO,TMG_LOG_LEVEL_INFO);

Setting log printing path

This API is used to set the log printing path, and needs to be called before initialization. The default path is /sdcard/Android/data/xxx.xxx.xxx/files.

Function prototype

public abstract int SetLogPath(String logDir);

Parameter	Type	Description
logDir	String	Path

Sample code

ITMGContext.GetInstance(this).SetLogPath(path);

Getting the diagnostic messages

This API is used to get information on the quality of real-time audio/video calls, which is mainly used to view real-time call quality and troubleshoot and can be ignored on the business side.

Function prototype

public abstract String GetQualityTips();

Sample code

ITMGContext.GetInstance(this).GetRoom().GetQualityTips();

Callback Messages

Message list

Message	Description
ITMG_MAIN_EVENT_TYPE_ENTER_ROOM	Indicates that a member enters an audio room.
ITMG_MAIN_EVENT_TYPE_EXIT_ROOM	Indicates that a member exits an audio room.
ITMG_MAIN_EVENT_TYPE_ROOM_DISCONNECT	Indicates that a room is disconnected for network or other reasons.
ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_TYPE	Indicates a room type change event.
ITMG_MAIN_EVENT_TYPE_ACCOMPANY_FINISH	Indicates that the accompaniment is over.
ITMG_MAIN_EVNET_TYPE_USER_UPDATE	Indicates that the room members are updated.
ITMG_MAIN_EVENT_TYPE_NUMBER_OF_USERS_UPDATE	Indicates that the room member quantity is updated.
ITMG_MAIN_EVENT_TYPE_NUMBER_OF_AUDIOSTREAMS_UPDATE	Indicates that the room audio stream quantity is updated.
ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_QUALITY	Indicates the room quality information.
ITMG_MAIN_EVNET_TYPE_PTT_RECORD_COMPLETE	Indicates that PTT recording is completed.
ITMG_MAIN_EVNET_TYPE_PTT_UPLOAD_COMPLETE	Indicates that PTT upload is completed.
ITMG_MAIN_EVNET_TYPE_PTT_DOWNLOAD_COMPLETE	Indicates that PTT download is completed.
ITMG_MAIN_EVNET_TYPE_PTT_PLAY_COMPLETE	Indicates that PTT playback is completed.
ITMG_MAIN_EVNET_TYPE_PTT_SPEECH2TEXT_COMPLETE	Indicates that speech-to-text conversion is completed.

Data list

Message	Data	Sample
ITMG_MAIN_EVENT_TYPE_ENTER_ROOM	result; error_info	{"error_info":"","result":0}
ITMG_MAIN_EVENT_TYPE_EXIT_ROOM	result; error_info	{"error_info":"","result":0}
ITMG_MAIN_EVENT_TYPE_ROOM_DISCONNECT	result; error_info	{"error_info":"waiting timeout, please check your network","result":0}
ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_TYPE	result; error_info; sub_event_type; new_room_type	{"error_info":"","new_room_type":0,"result":0}
ITMG_MAIN_EVENT_TYPE_SPEAKER_NEW_DEVICE	result; error_info	{"deviceID":"{0.0.0.00000000}.{a4f1e8be-49fa-43e2-b8cf-dd00542b47ae}","deviceName":"Speaker (Realtek High Definition Audio)","error_info":"","isNewDevice":true,"isUsedDevice":false,"result":0}
ITMG_MAIN_EVENT_TYPE_SPEAKER_LOST_DEVICE	result; error_info	{"deviceID":"{0.0.0.00000000}.{a4f1e8be-49fa-43e2-b8cf-dd00542b47ae}","deviceName":"Speaker (Realtek High Definition Audio)","error_info":"","isNewDevice":false,"isUsedDevice":false,"result":0}
ITMG_MAIN_EVENT_TYPE_MIC_NEW_DEVICE	result; error_info	{"deviceID":"{0.0.1.00000000}.{5fdf1a5b-f42d-4ab2-890a-7e454093f229}","deviceName":"Mic (Realtek High Definition Audio)","error_info":"","isNewDevice":true,"isUsedDevice":true,"result":0}
ITMG_MAIN_EVENT_TYPE_MIC_LOST_DEVICE	result; error_info	{"deviceID":"{0.0.1.00000000}.{5fdf1a5b-f42d-4ab2-890a-7e454093f229}","deviceName":"Mic (Realtek High Definition Audio)","error_info":"","isNewDevice":false,"isUsedDevice":true,"result":0}
ITMG_MAIN_EVNET_TYPE_USER_UPDATE	user_list; event_id	{"event_id":1,"user_list":["0"]}
ITMG_MAIN_EVENT_TYPE_NUMBER_OF_USERS_UPDATE	AllUser; AccUser; ProxyUser	{"AllUser":3,"AccUser":2,"ProxyUser":1}
ITMG_MAIN_EVENT_TYPE_NUMBER_OF_AUDIOSTREAMS_UPDATE	AudioStreams	{"AudioStreams":3}
ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_QUALITY	weight; loss; delay	{"weight":5,"loss":0.1,"delay":1}
ITMG_MAIN_EVNET_TYPE_PTT_RECORD_COMPLETE	result; file_path	{"file_path":"","result":0}
ITMG_MAIN_EVNET_TYPE_PTT_UPLOAD_COMPLETE	result; file_path;file_id	{"file_id":"","file_path":"","result":0}
ITMG_MAIN_EVNET_TYPE_PTT_DOWNLOAD_COMPLETE	result; file_path;file_id	{"file_id":"","file_path":"","result":0}
ITMG_MAIN_EVNET_TYPE_PTT_PLAY_COMPLETE	result; file_path	{"file_path":"","result":0}
ITMG_MAIN_EVNET_TYPE_PTT_SPEECH2TEXT_COMPLETE	result; text;file_id	{"file_id":"","text":"","result":0}
ITMG_MAIN_EVNET_TYPE_PTT_STREAMINGRECOGNITION_COMPLETE	result; file_path; text;file_id	{"file_id":"","file_path":","text":"","result":0}