Porcupine Wake Word — Go API

API Reference for the Porcupine Go SDK (pkg.go.dev ).

porcupine.BuiltInKeywords

var BuiltInKeywords []BuiltInKeyword

List of available built-in wake words.

porcupine.FrameLength

var FrameLength int

Number of audio samples per frame.

porcupine.SampleRate

var SampleRate int

Audio sample rate accepted by Porcupine.

porcupine.Version

var Version string

Porcupine version.

porcupine.BuiltInKeyword

type BuiltInKeyword string

Type representing a keyword that is packaged with the Porcupine SDK. Possible values are:

const (
    ALEXA       BuiltInKeyword = "alexa"
    AMERICANO   BuiltInKeyword = "americano"
    BLUEBERRY   BuiltInKeyword = "blueberry"
    BUMBLEBEE   BuiltInKeyword = "bumblebee"
    COMPUTER    BuiltInKeyword = "computer"
    GRAPEFRUIT  BuiltInKeyword = "grapefruit"
    GRASSHOPPER BuiltInKeyword = "grasshopper"
    HEY_GOOGLE  BuiltInKeyword = "hey google"
    HEY_SIRI    BuiltInKeyword = "hey siri"
    JARVIS      BuiltInKeyword = "jarvis"
    OK_GOOGLE   BuiltInKeyword = "ok google"
    PICOVOICE   BuiltInKeyword = "picovoice"
    PORCUPINE   BuiltInKeyword = "porcupine"
    TERMINATOR  BuiltInKeyword = "terminator"
)

porcupine.BuiltInKeyword.IsValid()

func (k BuiltInKeyword) IsValid() bool

Checks if a given BuiltInKeyword is valid.

porcupine.Porcupine

type Porcupine struct

Struct for the Porcupine Wake Word engine.

porcupine.Porcupine.AccessKey

var AccessKey string

AccessKey obtained from Picovoice Console (https://console.picovoice.ai/ ).

porcupine.Porcupine.BuiltInKeywords

var BuiltInKeywords []BuiltInKeyword

List of built-in keywords to use.

porcupine.Porcupine.KeywordPaths

var KeywordPaths []string

Absolute paths to keyword model files.

porcupine.Porcupine.LibraryPath

var LibraryPath string

Absolute path to the Porcupine's dynamic library.

porcupine.Porcupine.ModelPath

var ModelPath string

Absolute path to the file containing model parameters.

porcupine.Porcupine.Sensitivities

var Sensitivities []float32

Sensitivity values for detecting keywords. Each value should be a number within [0, 1]. A higher sensitivity results in fewer misses at the cost of increasing the false alarm rate.

porcupine.Porcupine.Delete()

func (porcupine *Porcupine) Delete() error

Releases resources acquired by Porcupine.

Returns

• error : Error produced by the Porcupine SDK. nil if no error was encountered.

porcupine.Porcupine.Init()

func (porcupine *Porcupine) Init() error

Init function for Porcupine. Must be called before attempting process.

Returns

• error : Error produced by the Porcupine SDK. nil if no error was encountered.

porcupine.Porcupine.Process()

func (porcupine *Porcupine) Process(pcm []int16) (keywordIndex int, err error)

Processes a frame of the incoming audio stream and emits the detection result. The number of samples-per-frame can be obtained by calling .FrameLength. The incoming audio needs to have a sample rate equal to .SampleRate and be 16-bit linearly-encoded. Porcupine operates on single-channel audio. Returns a 0 based index if keyword was detected in frame. Returns -1 if no detection was made.

Parameters

• pcm []int16 : A frame of audio samples.

Returns

• int : Index of observed keyword at the end of the current frame. Indexing is 0-based and matches the ordering of keywords provided to the Porcupine struct. If no keyword is detected then it returns -1.
• error : Error produced by the Porcupine SDK. nil if no error was encountered.

porcupine.PorcupineError

type PorcupineError struct

Custom error type for errors produced from the Porcupine Go SDK.

porcupine.PorcupineError.Error()

func (e *PorcupineError) Error() string

Formats the Porcupine error into a string.

Returns

• string : Formatted error string.

porcupine.PvStatus

type PvStatus struct

Status return codes from the Porcupine library. Possible values are:

const (
    SUCCESS                  PvStatus = 0
    OUT_OF_MEMORY            PvStatus = 1
    IO_ERROR                 PvStatus = 2
    INVALID_ARGUMENT         PvStatus = 3
    STOP_ITERATION           PvStatus = 4
    KEY_ERROR                PvStatus = 5
    INVALID_STATE            PvStatus = 6
    RUNTIME_ERROR            PvStatus = 7
    ACTIVATION_ERROR         PvStatus = 8
    ACTIVATION_LIMIT_REACHED PvStatus = 9
    ACTIVATION_THROTTLED     PvStatus = 10
    ACTIVATION_REFUSED       PvStatus = 11
)