/// <summary>
/// Lists available audio input devices.
/// </summary>
public static void ShowAudioDevices()
{
string[] devices = PvRecorder.GetAudioDevices();
for (int i = 0; i < devices.Length; i++)
{
Console.WriteLine($"index: {i}, device name: {devices[i]}");
}
}
/// <summary>
/// Creates an input audio stream and instantiates an instance of Cheetah object.
/// </summary>
/// <param name="accessKey">AccessKey obtained from Picovoice Console (https://console.picovoice.ai/).</param>
/// <param name="modelPath">Absolute path to the file containing model parameters. If not set it will be set to the default location.</param>
/// <param name="endpointDurationSec">
/// Duration of endpoint in seconds. A speech endpoint is detected when there is a segment of audio(with a duration specified herein) after
/// an utterance without any speech in it. Set to `0` to disable
/// </param>
/// <param name="audioDeviceIndex">Optional argument. If provided, audio is recorded from this input device. Otherwise, the default audio input device is used.</param>
public static void RunDemo(
string accessKey,
string modelPath,
float endpointDurationSec,
int audioDeviceIndex)
{
Cheetah cheetah = null;
cheetah = Cheetah.Create(
accessKey,
modelPath,
endpointDurationSec);
PvRecorder recorder = PvRecorder.Create(audioDeviceIndex, cheetah.FrameLength);
recorder.Start();
List <short> audioFrame = new List <short>();
Console.CancelKeyPress += (s, o) =>
{
Console.WriteLine("Stopping...");
};
Console.WriteLine($"\nUsing device: {recorder.SelectedDevice}");
Console.WriteLine(">>> Press `CTRL+C` to exit:\n");
try
{
while (true)
{
short[] pcm = recorder.Read();
CheetahTranscript transcriptObj = cheetah.Process(pcm);
if (!String.IsNullOrEmpty(transcriptObj.Transcript))
{
Console.Write(transcriptObj.Transcript);
}
if (transcriptObj.IsEndpoint)
{
CheetahTranscript finalTranscriptObj = cheetah.Flush();
Console.WriteLine(finalTranscriptObj.Transcript);
}
}
}
catch (CheetahActivationLimitException)
{
Console.WriteLine($"AccessKey '{accessKey}' has reached its processing limit.");
}
finally
{
cheetah.Dispose();
recorder.Dispose();
}
}
/// <summary>
/// Creates an input audio stream, instantiates an instance of Porcupine object, and monitors the audio stream for
/// occurrencec of the wake word(s). It prints the time of detection for each occurrence and the wake word.
/// </summary>
/// <param name="accessKey">AccessKey obtained from Picovoice Console (https://console.picovoice.ai/).</param>
/// <param name="modelPath">Absolute path to the file containing model parameters. If not set it will be set to the default location.</param>
/// <param name="keywordPaths">Absolute paths to keyword model files. If not set it will be populated from `keywords` argument.</param>
/// <param name="sensitivities">
/// Sensitivities 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. If not set 0.5 will be used.
/// </param>
/// <param name="audioDeviceIndex">Optional argument. If provided, audio is recorded from this input device. Otherwise, the default audio input device is used.</param>
/// <param name="outputPath">Optional argument. If provided, recorded audio will be stored in this location at the end of the run.</param>
public static void RunDemo(
string accessKey,
string modelPath,
List <string> keywordPaths,
List <float> sensitivities,
int audioDeviceIndex,
string outputPath = null)
{
Porcupine porcupine = null;
BinaryWriter outputFileWriter = null;
int totalSamplesWritten = 0;
// init porcupine wake word engine
porcupine = Porcupine.FromKeywordPaths(accessKey, keywordPaths, modelPath, sensitivities);
// get keyword names for labeling detection results
List <string> keywordNames = keywordPaths.Select(k => Path.GetFileNameWithoutExtension(k).Split("_")[0]).ToList();
// open stream to output file
if (!string.IsNullOrWhiteSpace(outputPath))
{
outputFileWriter = new BinaryWriter(new FileStream(outputPath, FileMode.OpenOrCreate, FileAccess.Write));
WriteWavHeader(outputFileWriter, 1, 16, 16000, 0);
}
Console.CancelKeyPress += (s, o) =>
{
Console.WriteLine("Stopping...");
if (outputFileWriter != null)
{
// write size to header and clean up
WriteWavHeader(outputFileWriter, 1, 16, 16000, totalSamplesWritten);
outputFileWriter.Flush();
outputFileWriter.Dispose();
}
porcupine?.Dispose();
};
// create and start recording
using (PvRecorder recorder = PvRecorder.Create(deviceIndex: audioDeviceIndex, frameLength: porcupine.FrameLength))
{
Console.WriteLine($"Using device: {recorder.SelectedDevice}");
Console.Write($"Listening for [{string.Join(' ', keywordNames.Select(k => $"'{k}'"))}]...\n");
recorder.Start();
while (true)
{
short[] pcm = recorder.Read();
int result = porcupine.Process(pcm);
if (result >= 0)
{
Console.WriteLine($"[{DateTime.Now.ToLongTimeString()}] Detected '{keywordNames[result]}'");
}
if (outputFileWriter != null)
{
foreach (short sample in pcm)
{
outputFileWriter.Write(sample);
}
totalSamplesWritten += pcm.Length;
}
Thread.Yield();
}
}
}
/// <summary>
/// Creates an input audio stream, instantiates an instance of Rhino object, and infers the intent from spoken commands.
/// </summary>
/// <param name="accessKey">AccessKey obtained from Picovoice Console (https://console.picovoice.ai/).</param>
/// <param name="contextPath">
/// Absolute path to file containing context model (file with `.rhn` extension). A context represents the set of
/// expressions(spoken commands), intents, and intent arguments(slots) within a domain of interest.
/// </param>
/// <param name="modelPath">Absolute path to the file containing model parameters. If not set it will be set to the default location.</param>
/// <param name="sensitivity">
/// Inference sensitivity. It should be a number within [0, 1]. A higher sensitivity value results in
/// fewer misses at the cost of (potentially) increasing the erroneous inference rate. If not set, the default value of 0.5 will be used.
/// </param>
/// <param name="requireEndpoint">
/// If set to `true`, Rhino requires an endpoint (chunk of silence) before finishing inference.
/// </param>
/// <param name="audioDeviceIndex">Optional argument. If provided, audio is recorded from this input device. Otherwise, the default audio input device is used.</param>
/// <param name="outputPath">Optional argument. If provided, recorded audio will be stored in this location at the end of the run.</param>
public static void RunDemo(
string accessKey,
string contextPath,
string modelPath,
float sensitivity,
bool requireEndpoint,
int audioDeviceIndex,
string outputPath = null)
{
Rhino rhino = null;
BinaryWriter outputFileWriter = null;
int totalSamplesWritten = 0;
// init rhino speech-to-intent engine
rhino = Rhino.Create(
accessKey,
contextPath,
modelPath,
sensitivity,
requireEndpoint);
// open stream to output file
if (!string.IsNullOrWhiteSpace(outputPath))
{
outputFileWriter = new BinaryWriter(new FileStream(outputPath, FileMode.OpenOrCreate, FileAccess.Write));
WriteWavHeader(outputFileWriter, 1, 16, 16000, 0);
}
Console.CancelKeyPress += (s, o) =>
{
Console.WriteLine("Stopping...");
if (outputFileWriter != null)
{
// write size to header and clean up
WriteWavHeader(outputFileWriter, 1, 16, 16000, totalSamplesWritten);
outputFileWriter.Flush();
outputFileWriter.Dispose();
}
rhino?.Dispose();
};
// create and start recording
using (PvRecorder recorder = PvRecorder.Create(audioDeviceIndex, rhino.FrameLength))
{
recorder.Start();
Console.WriteLine(rhino.ContextInfo);
Console.WriteLine($"\nUsing device: {recorder.SelectedDevice}");
Console.WriteLine("Listening...\n");
while (true)
{
short[] pcm = recorder.Read();
bool isFinalized = rhino.Process(pcm);
if (isFinalized)
{
Inference inference = rhino.GetInference();
if (inference.IsUnderstood)
{
Console.WriteLine("{");
Console.WriteLine($" intent : '{inference.Intent}'");
Console.WriteLine(" slots : {");
foreach (KeyValuePair <string, string> slot in inference.Slots)
{
Console.WriteLine($" {slot.Key} : '{slot.Value}'");
}
Console.WriteLine(" }");
Console.WriteLine("}");
}
else
{
Console.WriteLine("Didn't understand the command.");
}
}
if (outputFileWriter != null)
{
foreach (short sample in pcm)
{
outputFileWriter.Write(sample);
}
totalSamplesWritten += pcm.Length;
}
Thread.Yield();
}
}
}
