Inworld Blueprint Function Library - Inworld AI Documentation

Overview > Inworld Blueprint Function Library Class: UInworldBlueprintFunctionLibrary | Inherits from: UBlueprintFunctionLibrary

Methods

BreakAudio
BuildPhoneSpansFromTTSOutput
CreateBooleanJinjaArgument
CreateFloatJinjaArgument
CreateIntJinjaArgument
CreateInworldDataError
CreateStringJinjaArgument
CreateStructJinjaArgument
DataStreamTTSOutputGetNext
DataStreamTTSOutputHasNext
GetCurrentWord
GetPhonemeBlends
GetPhonemeBlendsTTS
GetRuntimeStruct
GetVisemeBlends
GetVisemeBlendsTTS
MakeAudio
RenderJinjaWithArgMap
RenderJinjaWithJson
TrimLLMOutput
UnwrapInworldDataHandle
WrapInworldData

Reference

BreakAudio

void BreakAudio(
    const FInworldData_Audio& Audio,
    TArray<uint8>& OutWaveform,
    int32& OutSampleRate
)

Parameters

Parameter	Type	Description
Audio	`const FInworldData_Audio&`	The audio data to break apart
OutWaveform	`TArray<uint8>&`	The raw PCM waveform bytes
OutSampleRate	`int32&`	The sample rate of the audio

BuildPhoneSpansFromTTSOutput

Builds a flat array of phone spans from a TTS output object. Extracts phonetic timing data from Timestamps → PhoneticDetails.Phones. Use this to cache lip-sync data from a completed TTS output before playback.

void BuildPhoneSpansFromTTSOutput(
    const FInworldData_TTSOutput& TTSOutput,
    TArray<FInworldPhoneSpan>& OutPhoneSpans
)

Parameters

Parameter	Type	Description
TTSOutput	`const FInworldData_TTSOutput&`	The TTS output containing phonetic timestamp data
OutPhoneSpans	`TArray<FInworldPhoneSpan>&`	The resulting flat array of phone spans

CreateBooleanJinjaArgument

FJinjaArgument CreateBooleanJinjaArgument(bool Value)

Parameters

Parameter	Type	Description
Value	`bool`	The boolean value to wrap

Returns

Type: FJinjaArgument

CreateFloatJinjaArgument

FJinjaArgument CreateFloatJinjaArgument(float Value)

Parameters

Parameter	Type	Description
Value	`float`	The float value to wrap

Returns

Type: FJinjaArgument

CreateIntJinjaArgument

FJinjaArgument CreateIntJinjaArgument(int32 Value)

Parameters

Parameter	Type	Description
Value	`int32`	The integer value to wrap

Returns

Type: FJinjaArgument

CreateInworldDataError

void CreateInworldDataError(
    UScriptStruct* InworldDataStructType,
    EInworldStatusCode StatusCode,
    const FString& Reason,
    int32& Data
)

Parameters

Parameter	Type	Description
InworldDataStructType	`UScriptStruct*`	The struct type to wrap the error in
StatusCode	`EInworldStatusCode`	The status code indicating the error type
Reason	`const FString&`	Human-readable description of the error
Data	`int32&`	Output: the resulting error data handle

CreateStringJinjaArgument

FJinjaArgument CreateStringJinjaArgument(FString Value)

Parameters

Parameter	Type	Description
Value	`FString`	The string value to wrap

Returns

Type: FJinjaArgument

CreateStructJinjaArgument

FJinjaArgument CreateStructJinjaArgument(const int32& Data)

Parameters

Parameter	Type	Description
Data	`const int32&`	The struct value to wrap (wildcard — accepts any USTRUCT)

Returns

Type: FJinjaArgument

DataStreamTTSOutputGetNext

Retrieves the next TTS output chunk from a streaming TTS data stream. Should only be called when DataStreamTTSOutputHasNext returns true.

FInworldDataHandle DataStreamTTSOutputGetNext(FInworldData_DataStream_TTSOutput TTSOutputStream)

Parameters

Parameter	Type	Description
TTSOutputStream	`FInworldData_DataStream_TTSOutput`	The TTS data stream to read from

Returns

Type: FInworldDataHandle

DataStreamTTSOutputHasNext

Returns whether a streaming TTS data stream has more output chunks available.

bool DataStreamTTSOutputHasNext(const FInworldData_DataStream_TTSOutput& TTSOutputStream)

Parameters

Parameter	Type	Description
TTSOutputStream	`const FInworldData_DataStream_TTSOutput&`	The TTS data stream to check

Returns

Type: bool

GetCurrentWord

Returns the word currently being spoken at the given playback position. Compares PlaybackInfo.Utterance.PlayedDuration against each word’s StartTime and EndTime from the TTS output timestamps.

FInworldAudioVoiceWord GetCurrentWord(
    const FInworldVoiceAudioPlaybackInfo& PlaybackInfo,
    const FInworldData_TTSOutput& TTSOutput
)

Parameters

Parameter	Type	Description
PlaybackInfo	`const FInworldVoiceAudioPlaybackInfo&`	Current playback state, including elapsed duration
TTSOutput	`const FInworldData_TTSOutput&`	The TTS output containing word timestamp data

Returns

Type: FInworldAudioVoiceWord

GetPhonemeBlends

Calculates phoneme blend weights at the current playback position from a pre-built array of phone spans. Uses the same timing logic as GetVisemeBlends but returns phoneme codes instead of viseme categories. Use this when you need raw phoneme data rather than viseme mappings.

FInworldPhonemeBlends GetPhonemeBlends(
    const FInworldVoiceAudioPlaybackInfo& PlaybackInfo,
    const TArray<FInworldPhoneSpan>& PhoneSpans
)

Parameters

Parameter	Type	Description
PlaybackInfo	`const FInworldVoiceAudioPlaybackInfo&`	Current playback state, including elapsed duration
PhoneSpans	`const TArray<FInworldPhoneSpan>&`	Pre-built array of phone spans (from `BuildPhoneSpansFromTTSOutput`)

Returns

Type: FInworldPhonemeBlends

GetPhonemeBlendsTTS

Calculates phoneme blend weights directly from a TTS output object and current playback position. Combines BuildPhoneSpansFromTTSOutput and GetPhonemeBlends in a single call. Use GetPhonemeBlends with a cached span array if performance is a concern.

FInworldPhonemeBlends GetPhonemeBlendsTTS(
    const FInworldVoiceAudioPlaybackInfo& PlaybackInfo,
    const FInworldData_TTSOutput& TTSOutput
)

Parameters

Parameter	Type	Description
PlaybackInfo	`const FInworldVoiceAudioPlaybackInfo&`	Current playback state, including elapsed duration
TTSOutput	`const FInworldData_TTSOutput&`	The TTS output containing phonetic timestamp data

Returns

Type: FInworldPhonemeBlends

GetRuntimeStruct

void GetRuntimeStruct(
    UInworldProcessContext* ProcessContext,
    const FName& Key,
    UScriptStruct* ScriptStruct,
    int32& Struct,
    bool& Successful
)

Parameters

Parameter	Type	Description
ProcessContext	`UInworldProcessContext*`	The process context to read from
Key	`const FName&`	The runtime data key to look up
ScriptStruct	`UScriptStruct*`	The expected struct type
Struct	`int32&`	Output: the retrieved struct value
Successful	`bool&`	Output: whether the retrieval succeeded

GetVisemeBlends

Calculates viseme blend weights for the current playback position from a pre-built array of phone spans. Smoothly interpolates between visemes. Build PhoneSpans once per utterance using BuildPhoneSpansFromTTSOutput and cache it for use each tick.

FInworldVisemeBlends GetVisemeBlends(
    const FInworldVoiceAudioPlaybackInfo& PlaybackInfo,
    const TArray<FInworldPhoneSpan>& PhoneSpans
)

Parameters

Parameter	Type	Description
PlaybackInfo	`const FInworldVoiceAudioPlaybackInfo&`	Current playback state, including elapsed duration
PhoneSpans	`const TArray<FInworldPhoneSpan>&`	Pre-built array of phone spans (from `BuildPhoneSpansFromTTSOutput`)

Returns

Type: FInworldVisemeBlends

GetVisemeBlendsTTS

Calculates viseme blend weights directly from a TTS output object and current playback position. Combines BuildPhoneSpansFromTTSOutput and GetVisemeBlends in a single call. Use GetVisemeBlends with a cached span array if performance is a concern.

FInworldVisemeBlends GetVisemeBlendsTTS(
    const FInworldVoiceAudioPlaybackInfo& PlaybackInfo,
    const FInworldData_TTSOutput& TTSOutput
)

Parameters

Parameter	Type	Description
PlaybackInfo	`const FInworldVoiceAudioPlaybackInfo&`	Current playback state, including elapsed duration
TTSOutput	`const FInworldData_TTSOutput&`	The TTS output containing phonetic timestamp data

Returns

Type: FInworldVisemeBlends

MakeAudio

FInworldData_Audio MakeAudio(
    const TArray<uint8>& Waveform,
    int32 SampleRate
)

Parameters

Parameter	Type	Description
Waveform	`const TArray<uint8>&`	Raw PCM waveform bytes
SampleRate	`int32`	Sample rate of the audio data

Returns

Type: FInworldData_Audio

RenderJinjaWithArgMap

Renders a Jinja2 template string using a map of typed argument values. Returns true on success and writes the rendered output to OutJinja. Use CreateBooleanJinjaArgument, CreateStringJinjaArgument, etc. to build the argument map.

bool RenderJinjaWithArgMap(
    const FString& Template,
    const TMap<FString, FJinjaArgument>& ArgMap,
    FString& OutJinja
)

Parameters

Parameter	Type	Description
Template	`const FString&`	The Jinja2 template string
ArgMap	`const TMap<FString, FJinjaArgument>&`	Map of variable names to typed argument values
OutJinja	`FString&`	Output: the rendered string

Returns

Type: bool — true if rendering succeeded

RenderJinjaWithJson

Renders a Jinja2 template string using variables supplied as a JSON string. Returns true on success and writes the rendered output to OutRender.

bool RenderJinjaWithJson(
    const FString& JinjaTemplate,
    const FString& VariablesJson,
    FString& OutRender
)

Parameters

Parameter	Type	Description
JinjaTemplate	`const FString&`	The Jinja2 template string
VariablesJson	`const FString&`	A JSON object string whose keys map to template variable names
OutRender	`FString&`	Output: the rendered string

Returns

Type: bool — true if rendering succeeded

TrimLLMOutput

Removes leading and trailing quotes as well as getting rid of double spaces and other artifacts of LLM text generation.

void TrimLLMOutput(
    const FString& LLMOutputString,
    FString& OutTrimmedLLMOutputString
)

Parameters

Parameter	Type	Description
LLMOutputString	`const FString&`	The LLM output string to edit
OutTrimmedLLMOutputString	`FString&`	The result string with spaces and quotes removed

UnwrapInworldDataHandle

void UnwrapInworldDataHandle(
    const FInworldDataHandle& DataHandle,
    UScriptStruct* ScriptStruct,
    int32& Data,
    bool& UnwrapSuccessful
)

Parameters

Parameter	Type	Description
DataHandle	`const FInworldDataHandle&`	The data handle to unwrap
ScriptStruct	`UScriptStruct*`	The expected struct type
Data	`int32&`	Output: the unwrapped struct value
UnwrapSuccessful	`bool&`	Output: whether the unwrap succeeded

WrapInworldData

FInworldDataHandle WrapInworldData(
    UScriptStruct* ScriptStruct,
    const int32& Data
)

Parameters

Parameter	Type	Description
ScriptStruct	`UScriptStruct*`	The struct type of the data to wrap
Data	`const int32&`	The struct value to wrap (wildcard — accepts any USTRUCT)

Returns

Type: FInworldDataHandle

Get Started

Templates

Guides

SDK Reference

Resources

​Methods

​Reference

​BreakAudio

​Parameters

​BuildPhoneSpansFromTTSOutput

​Parameters

​CreateBooleanJinjaArgument

​Parameters

​Returns

​CreateFloatJinjaArgument

​Parameters

​Returns

​CreateIntJinjaArgument

​Parameters

​Returns

​CreateInworldDataError

​Parameters

​CreateStringJinjaArgument

​Parameters

​Returns

​CreateStructJinjaArgument

​Parameters

​Returns

​DataStreamTTSOutputGetNext

​Parameters

​Returns

​DataStreamTTSOutputHasNext

​Parameters

​Returns

​GetCurrentWord

​Parameters

​Returns

​GetPhonemeBlends

​Parameters

​Returns

​GetPhonemeBlendsTTS

​Parameters

​Returns

​GetRuntimeStruct

​Parameters

​GetVisemeBlends

​Parameters

​Returns

​GetVisemeBlendsTTS

​Parameters

​Returns

​MakeAudio

​Parameters

​Returns

​RenderJinjaWithArgMap

​Parameters

​Returns

​RenderJinjaWithJson

​Parameters

​Returns

​TrimLLMOutput

​Parameters

​UnwrapInworldDataHandle

​Parameters

​WrapInworldData

​Parameters

​Returns

Methods

Reference

BreakAudio

Parameters

BuildPhoneSpansFromTTSOutput

Parameters

CreateBooleanJinjaArgument

Parameters

Returns

CreateFloatJinjaArgument

Parameters

Returns

CreateIntJinjaArgument

Parameters

Returns

CreateInworldDataError

Parameters

CreateStringJinjaArgument

Parameters

Returns

CreateStructJinjaArgument

Parameters

Returns

DataStreamTTSOutputGetNext

Parameters

Returns

DataStreamTTSOutputHasNext

Parameters

Returns

GetCurrentWord

Parameters

Returns

GetPhonemeBlends

Parameters

Returns

GetPhonemeBlendsTTS

Parameters

Returns

GetRuntimeStruct

Parameters

GetVisemeBlends

Parameters

Returns

GetVisemeBlendsTTS

Parameters

Returns

MakeAudio

Parameters

Returns

RenderJinjaWithArgMap

Parameters

Returns

RenderJinjaWithJson

Parameters

Returns

TrimLLMOutput

Parameters

UnwrapInworldDataHandle

Parameters

WrapInworldData

Parameters

Returns