/// <summary>
/// Creates an instance of the Porcupine wake word engine.
/// </summary>
/// <param name="modelPath">Absolute path to file containing model parameters.</param>
/// <param name="keywordPaths">A list of absolute paths to keyword model files.</param>
/// <param name="sensitivities">
/// A list of sensitivity values for each keyword. A higher sensitivity value lowers miss rate at the cost of increased
/// false alarm rate. A sensitivity value should be within [0, 1].
/// </param>
private Porcupine(string modelPath, IEnumerable <string> keywordPaths, IEnumerable <float> sensitivities)
{
PorcupineStatus status = pv_porcupine_init(modelPath, keywordPaths.Count(), keywordPaths.ToArray(), sensitivities.ToArray(), out _libraryPointer);
if (status != PorcupineStatus.SUCCESS)
{
throw PorcupineStatusToException(status);
}
Version = Marshal.PtrToStringAnsi(pv_porcupine_version());
SampleRate = pv_sample_rate();
FrameLength = pv_porcupine_frame_length();
}
/// <summary>
/// Process a frame of audio with the wake word engine.
/// </summary>
/// <param name="pcm">
/// A frame of audio samples to be assessed by Porcupine. The required audio format is found by calling `.SampleRate` to get the required
/// sample rate and `.FrameLength` to get the required frame size. Audio must be single-channel and 16-bit linearly-encoded.
/// </param>
/// <returns>
/// Index of the detected keyword, or -1 if no detection occurred
/// </returns>
public int Process(short[] pcm)
{
if (pcm.Length != FrameLength)
{
throw new ArgumentException($"Input audio frame size ({pcm.Length}) was not the size specified by Porcupine engine ({FrameLength}). " +
$"Use Porcupine.FrameLength to get the correct size.");
}
int keywordIndex;
PorcupineStatus status = pv_porcupine_process(_libraryPointer, pcm, out keywordIndex);
if (status != PorcupineStatus.SUCCESS)
{
throw PorcupineStatusToException(status);
}
return(keywordIndex);
}
/// <summary>
/// Creates an instance of the Porcupine wake word engine.
/// </summary>
/// <param name="modelPath">Absolute path to file containing model parameters.</param>
/// <param name="keywordPaths">A list of absolute paths to keyword model files.</param>
/// <param name="sensitivities">
/// A list of sensitivity values for each keyword. A higher sensitivity value lowers miss rate at the cost of increased
/// false alarm rate. A sensitivity value should be within [0, 1].
/// </param>
public Porcupine(string modelPath, IEnumerable <string> keywordPaths, IEnumerable <float> sensitivities)
{
if (string.IsNullOrWhiteSpace(modelPath) ||
keywordPaths == null || keywordPaths.Count() == 0 ||
sensitivities == null || sensitivities.Count() == 0)
{
throw new ArgumentNullException("One or more of the constructor arguments were null or empty. ");
}
if (!File.Exists(modelPath))
{
throw new IOException($"Couldn't find model file at '{modelPath}'");
}
foreach (string path in keywordPaths)
{
if (!File.Exists(path))
{
throw new IOException($"Couldn't find keyword file at '{path}'");
}
}
if (sensitivities.Any(s => s < 0 || s > 1))
{
throw new ArgumentException("Sensitivities should be within [0, 1].");
}
if (keywordPaths.Count() != sensitivities.Count())
{
throw new ArgumentException($"Number of keywords ({keywordPaths.Count()}) does not match number of sensitivities ({sensitivities.Count()})");
}
PorcupineStatus status = pv_porcupine_init(modelPath, keywordPaths.Count(), keywordPaths.ToArray(), sensitivities.ToArray(), out _libraryPointer);
if (status != PorcupineStatus.SUCCESS)
{
throw PorcupineStatusToException(status);
}
Version = Marshal.PtrToStringAnsi(pv_porcupine_version());
SampleRate = pv_sample_rate();
FrameLength = pv_porcupine_frame_length();
}
/// <summary>
/// Coverts status codes to relavent .NET exceptions
/// </summary>
/// <param name="status">Picovoice library status code.</param>
/// <returns>.NET exception</returns>
private static PorcupineException PorcupineStatusToException(
PorcupineStatus status,
string message = "")
{
switch (status)
{
case PorcupineStatus.OUT_OF_MEMORY:
return(new PorcupineMemoryException(message));
case PorcupineStatus.IO_ERROR:
return(new PorcupineIOException(message));
case PorcupineStatus.INVALID_ARGUMENT:
return(new PorcupineInvalidArgumentException(message));
case PorcupineStatus.STOP_ITERATION:
return(new PorcupineStopIterationException(message));
case PorcupineStatus.KEY_ERROR:
return(new PorcupineKeyException(message));
case PorcupineStatus.INVALID_STATE:
return(new PorcupineInvalidStateException(message));
case PorcupineStatus.RUNTIME_ERROR:
return(new PorcupineRuntimeException(message));
case PorcupineStatus.ACTIVATION_ERROR:
return(new PorcupineActivationException(message));
case PorcupineStatus.ACTIVATION_LIMIT_REACHED:
return(new PorcupineActivationLimitException(message));
case PorcupineStatus.ACTIVATION_THROTTLED:
return(new PorcupineActivationThrottledException(message));
case PorcupineStatus.ACTIVATION_REFUSED:
return(new PorcupineActivationRefusedException(message));
default:
return(new PorcupineException("Unmapped error code returned from Porcupine."));
}
}
/// <summary>
/// Creates an instance of the Porcupine wake word engine.
/// </summary>
/// <param name="accessKey">AccessKey obtained from Picovoice Console (https://console.picovoice.ai/).</param>
/// <param name="modelPath">Absolute path to file containing model parameters.</param>
/// <param name="keywordPaths">A list of absolute paths to keyword model files.</param>
/// <param name="sensitivities">
/// A list of sensitivity values for each keyword. A higher sensitivity value lowers miss rate at the cost of increased
/// false alarm rate. A sensitivity value should be within [0, 1].
/// </param>
private Porcupine(
string accessKey,
IEnumerable <string> keywordPaths,
string modelPath = null,
IEnumerable <float> sensitivities = null)
{
if (string.IsNullOrEmpty(accessKey))
{
throw new PorcupineInvalidArgumentException("No AccessKey provided to Porcupine");
}
modelPath = modelPath ?? DEFAULT_MODEL_PATH;
if (!File.Exists(modelPath))
{
throw new PorcupineIOException($"Couldn't find model file at '{modelPath}'");
}
if (keywordPaths == null || keywordPaths.Count() == 0)
{
throw new PorcupineInvalidArgumentException("No keyword file paths were provided to Porcupine");
}
foreach (string path in keywordPaths)
{
if (!File.Exists(path))
{
throw new PorcupineIOException($"Couldn't find keyword file at '{path}'");
}
}
if (sensitivities == null)
{
sensitivities = Enumerable.Repeat(0.5f, keywordPaths.Count());
}
else
{
if (sensitivities.Any(s => s < 0 || s > 1))
{
throw new PorcupineInvalidArgumentException("Sensitivities should be within [0, 1].");
}
}
if (sensitivities.Count() != keywordPaths.Count())
{
throw new PorcupineInvalidArgumentException($"Number of keywords ({keywordPaths.Count()}) does not match number of sensitivities ({sensitivities.Count()})");
}
PorcupineStatus status = pv_porcupine_init(
accessKey,
modelPath,
keywordPaths.Count(),
keywordPaths.ToArray(),
sensitivities.ToArray(),
out _libraryPointer);
if (status != PorcupineStatus.SUCCESS)
{
throw PorcupineStatusToException(status, "Porcupine init failed.");
}
Version = Marshal.PtrToStringAnsi(pv_porcupine_version());
SampleRate = pv_sample_rate();
FrameLength = pv_porcupine_frame_length();
}
