This document describes how to access and debug the GME APIs for Unity.

Note：

This document applies to GME SDK v2.7.

Key Considerations for Using GME

Note：

• 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 GME callback messages, please see the callback message list.
• Operation on devices should be performed after successful room entry.
• For detailed error codes, please see Error Codes.

Voice Chat Flowchart

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 voice messaging and speech-to-text features.
If you have any questions when using the service, please see General FAQs.

Getting an instance

Get the Context instance by using the ITMGContext method instead of QAVContext.GetInstance().

Initializing the SDK

For more information on how to get parameters, please see Access Guide.
This API requires the AppID from the Tencent Cloud Console and the openID as parameters. The openID uniquely identifies a user with the rules stipulated by the application developer and must be unique in the application (currently, only INT64 is supported).

Note：

The SDK must be initialized before a client can enter a room.

Function prototype

ITMGContext Init(string sdkAppID, string openID)

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

int ret = ITMGContext.GetInstance().Init(sdkAppId, openID);
// Determine whether the initialization is successful by the returned value
if (ret != QAVError.OK)
    {
        Debug.Log("SDK initialization failed:"+ret);
        return;
    }

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.

Function prototype

ITMGContext public abstract int Poll();

Sample code

public void Update()
    {
        ITMGContext.GetInstance().Poll();
    }

Pausing system

When a Pause event occurs in the system, the engine should also be notified for pause.

Function prototype

ITMGContext public abstract int Pause()

Resuming system

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

Function prototype

ITMGContext  public abstract int Resume()

Uninitializing the SDK

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

Function prototype

ITMGContext public abstract int Uninit()

Voice Chat Room Call 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.

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.
To get authentication for voice messaging and speech-to-text, the room ID parameter must be set to null.

Function prototype

QAVAuthBuffer GenAuthBuffer(int appId, string roomId, string openId, string key)

Sample code

public static byte[] GetAuthBuffer(string AppID, string RoomID,string OpenId, string AuthKey){
        return QAVAuthBuffer.GenAuthBuffer(int.Parse(AppID), RoomID, OpenId, AuthKey);
}

Entering room

This API is used to enter a room with the generated authentication information. The mic and speaker are not enabled by default after room entry.

For more information on how to access Range Voice, please see Range Voice.

Function prototype

ITMGContext EnterRoom(string roomId, int roomType, byte[] authBuffer)

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

Sample code

ITMGContext.GetInstance().EnterRoom(strRoomId, ITMGRoomType.ITMG_ROOM_TYPE_FLUENCY, byteAuthbuffer);

Callback for room entry

A callback will be required through a delegate function after room entry, which is composed of result and error_info.

Function prototype

Delegate function:
public delegate void QAVEnterRoomComplete(int result, string error_info);
Event function:
public abstract event QAVEnterRoomComplete OnEnterRoomCompleteEvent;

Sample code

Listen on an event:
ITMGContext.GetInstance().OnEnterRoomCompleteEvent += new QAVEnterRoomComplete(OnEnterRoomComplete);

Process the event listened on:
void OnEnterRoomComplete(int err, string errInfo)
    {
    if (err != 0) {
              ShowLoginPanel("error code:" + err + " error message:" + errInfo);
            return;
    }else{
        // Entered room successfully
    }
}

Error codes

Determining whether client has entered room

This API is used to determine whether the client has entered a room. A bool-type value will be returned.

Function prototype

ITMGContext abstract bool IsRoomEntered()

Sample code

ITMGContext.GetInstance().IsRoomEntered();

Exiting 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

ITMGContext ExitRoom()

Sample code

ITMGContext.GetInstance().ExitRoom();

Callback for room exit

A callback will be executed through a delegate function to pass a message after room exit.

Function prototype

Delegate function:
public delegate void QAVExitRoomComplete();
Event function:
public abstract event QAVExitRoomComplete OnExitRoomCompleteEvent; 

Sample code

Listen on an event:
ITMGContext.GetInstance().OnExitRoomCompleteEvent += new QAVExitRoomComplete(OnExitRoomComplete);
Process the event listened on:
void OnExitRoomComplete(){
    // Send a callback after room exit
}

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

ITMGContext ITMGRoom public int GetRoomType()

Sample code

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

Modifying user's room audio type

This API is used to modify user's room audio type.

Function prototype

ITMGContext ITMGRoom public int ChangeRoomType(ITMGRoomType roomtype)

Sample code

ITMGContext.GetInstance().GetRoom().ChangeRoomType(ITMG_ROOM_TYPE_FLUENCY);

Callback for modifying room audio type

Set the room type. After the room type is set, a callback will be executed through a delegate function to pass a message indicating that the modification has been completed.

Delegate function:
public abstract event QAVCallback OnChangeRoomtypeCallback;

Event function:
public abstract event QAVOnRoomTypeChangedEvent OnRoomTypeChangedEvent;

Sample code

Listen on an event:
ITMGContext.GetInstance ().OnRoomTypeChangedEvent += new QAVOnRoomTypeChangedEvent (OnRoomTypeChangedEvent);
Process the event listened on:
void OnRoomTypeChangedEvent(int roomtype)
{
        ShowWarnning (string.Format ("RoomTypeChanged current:{0}",roomtype));
}

Notification of room type change

Once the room type is modified by you or another user in the room, this callback function will be called to notify the business layer of the room type change. The returned value will be the room type. For more information, please see the EnterRoom API.

Delegate function:
public delegate void QAVOnRoomTypeChangedEvent(int roomtype);

Event function:
public abstract event QAVOnRoomTypeChangedEvent OnRoomTypeChangedEvent;    

Sample code

Listen on an event:
ITMGContext.GetInstance().OnRoomTypeChangedEvent += new QAVOnRoomTypeChangedEvent(OnRoomTypeChangedEvent);
Process the event listened on:
void OnRoomTypeChangedEvent(int roomtype){
    // Send a callback after the room type is changed
}

Member status change

A 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 the upper layer. The event message ITMG_MAIN_EVNET_TYPE_USER_UPDATE containing event_id, count, and openIdList will be returned, which 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.

Room member maintenance flowchart

Sample code

Delegate function:
public delegate void QAVEndpointsUpdateInfo(int eventID, int count, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)]string[] openIdList);
Event function:
public abstract event QAVEndpointsUpdateInfo OnEndpointsUpdateInfoEvent;

Listen on an event:
ITMGContext.GetInstance().OnEndpointsUpdateInfoEvent += new QAVEndpointsUpdateInfo(OnEndpointsUpdateInfo);
Process the event listened on:
void OnEndpointsUpdateInfo(int eventID, int count, string[] openIdList)
{
    // Process

            switch (eventID)
             {
             case EVENT_ID_ENDPOINT_ENTER:
                  // A member enters the room
                  break;
             case EVENT_ID_ENDPOINT_EXIT:
                  // A member exits the room
                break;
            case EVENT_ID_ENDPOINT_HAS_AUDIO:
                // A member sends audio packets
                break;
            case EVENT_ID_ENDPOINT_NO_AUDIO:
                // A member stops sending audio packets
                break;

            default:
                break;
             }
        break;
}

Room call quality control event

The message for quality control event triggered after room entry is ITMG_MAIN_EVENT_TYPE_CHANGE_ROOM_QUALITY. The returned parameters include weight, loss, and delay, which represent the following information. The event message will be identified in the OnEvent function.

Voice Chat Audio APIs

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, you are 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 won't 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.

Enabling/Disabling the mic

This API is used to enable/disable the mic. Mic and speaker are not enabled by default after room entry.
EnableMic = EnableAudioCaptureDevice + EnableAudioSend.

Function prototype

ITMGAudioCtrl EnableMic(bool isEnabled)

Sample code

Enable the mic:
ITMGContext.GetInstance().GetAudioCtrl().EnableMic(true);

Getting mic status

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

Function prototype

ITMGAudioCtrl GetMicState()

Sample code

micToggle.isOn = ITMGContext.GetInstance().GetAudioCtrl().GetMicState();

Enabling/Disabling capture 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

ITMGAudioCtrl int EnableAudioPlayDevice(bool isEnabled)

Sample code

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

Getting capturing device status

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

Function prototype

ITMGAudioCtrl bool IsAudioCaptureDeviceEnabled()

Sample code

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

Enabling/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

ITMGAudioCtrl int EnableAudioSend(bool isEnabled)

Sample code

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

Getting audio upstreaming status

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

Function prototype

ITMGAudioCtrl bool IsAudioSendEnabled()

Sample code

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

Getting real-time mic volume level

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

Function prototype

ITMGAudioCtrl int GetMicLevel

Sample code

ITMGContext.GetInstance().GetAudioCtrl().GetMicLevel();

Getting real-time audio upstreaming volume level

This API is used to get the real-time audio upstreaming volume level. An int-type value will be returned. Value range: 0–100.

Function prototype

ITMGAudioCtrl int GetSendStreamLevel()

Sample code

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

Setting mic volume level

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

Function prototype

ITMGAudioCtrl SetMicVolume(int volume)

Sample code

int micVol = (int)(value * 100);
ITMGContext.GetInstance().GetAudioCtrl().SetMicVolume (micVol);

Getting mic volume level

This API is used to get the mic volume level. An int-type value will be returned. 101 indicates that the SetMicVolume API has not been called.

Function prototype

ITMGAudioCtrl GetMicVolume()

Sample code

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

Enabling/Disabling the speaker

This API is used to enable/disable the speaker.
EnableSpeaker = EnableAudioPlayDevice + EnableAudioRecv.

Function prototype

ITMGAudioCtrl EnableSpeaker(bool isEnabled)

Sample code

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

Getting speaker status

This API is used to get the speaker status. 0 indicates that the speaker is off, 1 on, and 2 working.

Function prototype

ITMGAudioCtrl GetSpeakerState()

Sample code

speakerToggle.isOn = ITMGContext.GetInstance().GetAudioCtrl().GetSpeakerState();

Enabling/Disabling playback device

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

Function prototype

ITMGAudioCtrl EnableAudioPlayDevice(bool isEnabled)

Sample code

Enable a playback device
ITMGContext.GetInstance().GetAudioCtrl().EnableAudioPlayDevice(true);

Getting playback device status

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

Function prototype

ITMGAudioCtrl bool IsAudioPlayDeviceEnabled()

Sample code

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

Enabling/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

ITMGAudioCtrl int EnableAudioRecv(bool isEnabled)

Sample code

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

Getting audio downstreaming status

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

Function prototype

ITMGAudioCtrl bool IsAudioRecvEnabled()

Sample code

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

Getting real-time speaker volume level

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

Function prototype

ITMGAudioCtrl GetSpeakerLevel()

Sample code

ITMGContext.GetInstance().GetAudioCtrl().GetSpeakerLevel();

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

This API is used to get the real-time audio downstreaming volume levels of other members in the room. An int-type value will be returned. Value range: 0–100.

Function prototype

ITMGAudioCtrl int GetRecvStreamLevel(string openId)

Sample code

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

Setting speaker volume level

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

Function prototype

ITMGAudioCtrl SetSpeakerVolume(int volume)

Sample code

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

Getting speaker volume level

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

Function prototype

ITMGAudioCtrl GetSpeakerVolume()

Sample code

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

Enabling in-ear monitoring

This API (EnableLoopBack) is used to enable in-ear monitoring. To hear your own voice as well, call both EnableLoopBack and EnableSpeaker.

Function prototype

ITMGContext GetAudioCtrl EnableLoopBack(bool enable)

Sample code

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

Callback for device use and release

After a device is used or released in a room, a callback will be executed through a delegate function to pass a message of the event.

Delegate function:
public delegate void QAVOnDeviceStateChangedEvent(int deviceType, string deviceId, bool openOrClose);
Event function:
public abstract event QAVOnDeviceStateChangedEvent OnDeviceStateChangedEvent;

Sample code

Listen on an event:
ITMGContext.GetInstance().GetAudioCtrl().OnDeviceStateChangedEvent += new QAVAudioDeviceStateCallback(OnAudioDeviceStateChange);
Process the event listened on:
void QAVAudioDeviceStateCallback(int deviceType, string deviceId, bool openOrClose){
    // Callback for device use and release
}

Speech-to-Text Conversion Flowchart

Voice Messaging and Speech-to-Text

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 voice messaging and speech-to-text features.
If you have any questions when using the service, please see Voice Messaging and Speech-to-Text.

Initialization APIs

Voice messaging and speech-to-text APIs

Authentication initialization

Call authentication initialization after initializing the SDK. For more information on how to get the authBuffer, please see the voice chat authentication information API.

Function prototype

ITMGPTT int ApplyPTTAuthbuffer (byte[] authBuffer)

Sample code

ITMGContext.GetInstance().GetPttCtrl().ApplyPTTAuthbuffer(authBuffer);

Specifying maximum duration of voice message

This API is used to specify the maximum duration of a voice message, which can be up to 58 seconds.

Function prototype

ITMGPTT int SetMaxMessageLength(int msTime)

Sample code

ITMGContext.GetInstance().GetPttCtrl().SetMaxMessageLength(10000); 

Starting recording

This API is used to start recording. The recording file must be uploaded first before you can perform operations such as speech-to-text conversion.

Function prototype

ITMGPTT int StartRecording(string fileDir)

Sample code

string recordPath = Application.persistentDataPath + string.Format ("/{0}.silk", sUid++);
int ret = ITMGContext.GetInstance().GetPttCtrl().StartRecording(recordPath);

Callback for recording start

A callback will be executed through a delegate function to pass a message when recording is completed.

Function prototype

Delegate function:
public delegate void QAVRecordFileCompleteCallback(int code, string filepath); 
Event function:
public abstract event QAVRecordFileCompleteCallback OnRecordFileComplete;

Error codes

Sample code

Listen on an event:
ITMGContext.GetInstance().GetPttCtrl().OnRecordFileComplete +=  new QAVRecordFileCompleteCallback (OnRecordFileComplete);
Process the event listened on:
void OnRecordFileComplete(int code, string filepath){
    // Callback for recording start
}

Starting streaming speech recognition

This API is used to start streaming speech recognition. Text obtained from speech-to-text conversion will be returned in real time in its callback. It can specify a language for recognition or translate the information recognized in speech into a specified language and return the translation.

Function prototype

ITMGPTT int StartRecordingWithStreamingRecognition(string filePath)
ITMGPTT int StartRecordingWithStreamingRecognition(string filePath, string translateLanguage,string translateLanguage) 

Sample code

string recordPath = Application.persistentDataPath + string.Format("/{0}.silk", sUid++);
int ret = ITMGContext.GetInstance().GetPttCtrl().StartRecordingWithStreamingRecognition(recordPath, "cmn-Hans-CN","cmn-Hans-CN");

Callback for streaming speech recognition start

A callback will be executed through a delegate function to pass a message when streaming speech-to-text conversion is completed.

Delegate function:
public delegate void QAVStreamingRecognitionCallback(int code, string fileid, string filepath, string result);
Event function:
public abstract event QAVStreamingRecognitionCallback OnStreamingSpeechComplete;

Sample code

Listen on an event:
ITMGContext.GetInstance().GetPttCtrl().OnStreamingSpeechComplete +=new QAVStreamingRecognitionCallback (OnStreamingSpeechComplete);
Process the event listened on:
void OnStreamingSpeechComplete(int code, string fileid, string filepath, string result){
    // Callback for streaming speech-to-text conversion start
}

Pausing recording

This API is used to pause recording. If you want to resume recording, please call the ResumeRecording API.

Function prototype

ITMGPTT int PauseRecording()

Sample code

ITMGContext.GetInstance().GetPttCtrl().PauseRecording();

Resuming recording

This API is used to resume recording.

Function prototype

ITMGPTT int ResumeRecording()

Sample code

ITMGContext.GetInstance().GetPttCtrl().ResumeRecording();

Stopping recording

This API is used to stop recording. It is async, and a callback for recording completion will be returned after recording stops. A recording file will be available only after recording succeeds.

Function prototype

ITMGPTT int StopRecording()

Sample code

ITMGContext.GetInstance().GetPttCtrl().StopRecording();

Canceling recording

This API is used to cancel recording. There is no callback after cancellation.

Function prototype

ITMGPTT int CancelRecording()

Sample code

ITMGContext.GetInstance().GetPttCtrl().CancelRecording();

Getting real-time mic volume level of voice messaging

This API is used to get the real-time mic volume level. An int-type value will be returned. Value range: 0–100.

Function prototype

ITMGPTT int GetMicLevel()

Sample code

ITMGContext.GetInstance().GetPttCtrl().GetMicLevel();

Setting recording volume level of voice messaging

This API is used to set the recording volume level of voice messaging. Value range: 0–100.

Function prototype

ITMGPTT int SetMicVolume(int vol)

Sample code

ITMGContext.GetInstance().GetPttCtrl().SetMicVolume(100);

Getting recording volume level of voice messaging

This API is used to get the recording volume level of voice messaging. An int-type value will be returned. Value range: 0–100.

Function prototype

ITMGPTT int GetMicVolume()

Sample code

ITMGContext.GetInstance().GetPttCtrl().GetMicVolume();

Getting real-time speaker volume level

This API is used to get the real-time speaker volume level. An int-type value will be returned. Value range: 0–100.

Function prototype

ITMGPTT int GetSpeakerLevel()

Sample code

ITMGContext.GetInstance().GetPttCtrl().GetSpeakerLevel();

Setting playback volume level of voice messaging

This API is used to set the playback volume level of voice messaging. Value range: 0–100.

Function prototype

ITMGPTT int SetSpeakerVolume(int vol)

Sample code

ITMGContext.GetInstance().GetPttCtrl().SetSpeakerVolume(100);

Getting playback volume level of voice messaging

This API is used to get the playback volume level of voice messaging. An int-type value will be returned. Value range: 0–100.

Function prototype

ITMGPTT int GetSpeakerVolume()

Sample code

ITMGContext.GetInstance().GetPttCtrl().GetSpeakerVolume();

Uploading audio file

This API is used to upload an audio file.

Function prototype

ITMGPTT int UploadRecordedFile (string filePath)

Sample code

ITMGContext.GetInstance().GetPttCtrl().UploadRecordedFile(filePath);

Callback for audio file upload completion

A callback will be executed through a delegate function to pass a message when the upload of audio file is completed.

Function prototype

Delegate function:
public delegate void QAVUploadFileCompleteCallback(int code, string filepath, string fileid);
Event function:
public abstract event QAVUploadFileCompleteCallback OnUploadFileComplete; 

Error codes

Sample code

Listen on an event:
ITMGContext.GetInstance().GetPttCtrl().OnUploadFileComplete +=new QAVUploadFileCompleteCallback (OnUploadFileComplete);
Process the event listened on:
void OnUploadFileComplete(int code, string filepath, string fileid){
    // Callback for audio file upload completion
}

Downloading audio file

This API is used to download an audio file.

Function prototype

ITMGPTT DownloadRecordedFile (string fileID, string downloadFilePath)

Sample code

ITMGContext.GetInstance().GetPttCtrl().DownloadRecordedFile(fileId, filePath);

Callback for audio file download completion

A callback will be executed through a delegate function to pass a message when the download of audio file is completed.

Function prototype

Delegate function:
public delegate void QAVDownloadFileCompleteCallback(int code, string filepath, string fileid);
Event function:
public abstract event QAVDownloadFileCompleteCallback OnDownloadFileComplete;

Error codes

Sample code

Listen on an event:
ITMGContext.GetInstance().GetPttCtrl().OnDownloadFileComplete +=new QAVDownloadFileCompleteCallback(OnDownloadFileComplete);
Process the event listened on:
void OnDownloadFileComplete(int code, string filepath, string fileid){
    // Callback for audio file download completion
}

Playing back audio

This API is used to play back audio.

Function prototype

ITMGPTT PlayRecordedFile (string downloadFilePath)

Sample code

ITMGContext.GetInstance().GetPttCtrl().PlayRecordedFile(filePath); 

Callback for audio playback

A callback will be executed through a delegate function to pass a message when an audio file is played back.

Function prototype

Delegate function:
public delegate void QAVPlayFileCompleteCallback(int code, string filepath);
Event function:
public abstract event QAVPlayFileCompleteCallback OnPlayFileComplete;

Error codes

Sample code

Listen on an event:
ITMGContext.GetInstance().GetPttCtrl().OnPlayFileComplete +=new  QAVPlayFileCompleteCallback(OnPlayFileComplete);
Process the event listened on:
void OnPlayFileComplete(int code, string filepath){
    // Callback for audio playback
}

Stopping audio playback

This API is used to stop audio playback. There will be a callback for playback completion when the playback stops.

Function prototype

ITMGPTT int StopPlayFile()

Sample code

ITMGContext.GetInstance().GetPttCtrl().StopPlayFile();

Getting audio file size

This API is used to get the size of an audio file.

Function prototype

ITMGPTT GetFileSize(string filePath) 

Sample code

int fileSize = ITMGContext.GetInstance().GetPttCtrl().GetFileSize(filepath);

Getting audio file duration

This API is used to get the duration of an audio file in milliseconds.

Function prototype

ITMGPTT int GetVoiceFileDuration(string filePath)

Sample code

int fileDuration = ITMGContext.GetInstance().GetPttCtrl().GetVoiceFileDuration(filepath);

Converting audio file to text

This API is used to convert a specified audio file to text.

Function prototype

ITMGPTT int SpeechToText(String fileID)

Sample code

ITMGContext.GetInstance().GetPttCtrl().SpeechToText(fileID);

Translating audio file into text in specified language

This API can specify a language for recognition or translate the information recognized in speech into a specified language and return the translation.

Function prototype

ITMGPTT int SpeechToText(String fileID,String language)

Sample code

ITMGContext.GetInstance().GetPttCtrl().SpeechToText(fileID,"cmn-Hans-CN","cmn-Hans-CN");

Callback for recognition

A callback will be executed through a delegate function to pass a message when a specified audio file is recognized and converted to text.

Function prototype

Delegate function:
public delegate void QAVSpeechToTextCallback(int code, string fileid, string result);
Event function:
public abstract event QAVSpeechToTextCallback OnSpeechToTextComplete;

Sample code

Listen on an event:
ITMGContext.GetInstance().GetPttCtrl().OnSpeechToTextComplete += new QAVSpeechToTextCallback(OnSpeechToTextComplete);
Process the event listened on:
void OnSpeechToTextComplete(int code, string fileid, string result){
    // Callback for recognition
}

Advanced APIs

Getting version number

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

Function prototype

ITMGContext  abstract string GetSDKVersion()

Sample code

ITMGContext.GetInstance().GetSDKVersion();

Setting log printing level

This API is used to set the level of logs to be printed. It is recommended to keep the default level.

Function prototype

ITMGContext  SetLogLevel(ITMG_LOG_LEVEL levelWrite, ITMG_LOG_LEVEL levelPrint)

Parameter description

Sample code

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

Setting log printing path

This API is used to set the log printing path.
The default path is as follows:

Function prototype

ITMGContext  SetLogPath(string logDir)

Sample code

ITMGContext.GetInstance().SetLogPath(path);

Getting 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 problems and can be ignored on the business side.

Function prototype

ITMGRoom GetQualityTips()

Sample code

string tips = ITMGContext.GetInstance().GetRoom().GetQualityTips();

Adding to audio data blocklist

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

Function prototype

ITMGContext ITMGAudioCtrl AddAudioBlackList(String openId)

Sample code

ITMGContext.GetInstance().GetAudioCtrl ().AddAudioBlackList (id);

Removing from audio data blocklist

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

Function prototype

ITMGContext ITMGAudioCtrl RemoveAudioBlackList(string openId)

Sample code

ITMGContext.GetInstance().GetAudioCtrl ().RemoveAudioBlackList (id);