Picovoice Platform — .NET API
This document outlines how to integrate Picovoice platform within an application using its .NET API.
Requirements
- .NET SDK 3.1+
Compatibility
- .NET Standard 2.0, .NET Core 2.0+ and .NET Framework 4.6.1+
- Runs on Linux (x86_64), macOS (x86_64) and Windows (x86_64)
Installation
You can install the latest version of Picovoice by adding the latest Picovoice NuGet package in Visual Studio or using the .NET CLI.
dotnet add package Picovoice
Usage
Create an instance of the engine
using Pv;string keywordPath = "/absolute/path/to/keyword.ppn";void wakeWordCallback() => {..}string contextPath = "/absolute/path/to/context.rhn";void inferenceCallback(Inference inference){// `inference` exposes three immutable properties:// (1) `IsUnderstood`// (2) `Intent`// (3) `Slots`// ..}Picovoice handle = new Picovoice(keywordPath,wakeWordCallback,contextPath,inferenceCallback);
handle
is an instance of Picovoice runtime engine that detects utterances of wake phrase defined in the file located at
keywordPath
. Upon detection of wake word it starts inferring user's intent from the follow-on voice command within
the context defined by the file located at contextPath
. keywordPath
is the absolute path to
Porcupine wake word engine keyword file (with .ppn
suffix).
contextPath
is the absolute path to Rhino Speech-to-Intent engine context file
(with .rhn
suffix). wakeWordCallback
is invoked upon the detection of wake phrase and inferenceCallback
is
invoked upon completion of follow-on voice command inference.
When instantiated, valid sample rate can be obtained via handle.SampleRate
. Expected number of audio samples per
frame is handle.FrameLength
. The engine accepts 16-bit linearly-encoded PCM and operates on single-channel audio.
short[] GetNextAudioFrame(){// .. get audioFramereturn audioFrame;}while(true){handle.Process(GetNextAudioFrame());}
Picovoice will have its resources freed by the garbage collector, but to have resources freed immediately after use, wrap it in a using statement:
using(Picovoice handle = new Picovoice(keywordPath, wakeWordCallback, contextPath, inferenceCallback)){// .. Picovoice usage here}
Custom Wake Word & Context
You can create custom Porcupine wake word and Rhino context models using Picovoice Console