public void WaveFileAudioSourceConstructorTest()
{
string fileName = Path.Combine(TestContext.CurrentContext.TestDirectory, "Resources", "a.wav");
WaveFileAudioSource target = new WaveFileAudioSource(fileName);
Signal s = null;
target.NewFrame += delegate(object sender, NewFrameEventArgs e)
{
if (s == null)
{
s = e.Signal;
}
Assert.AreEqual(s.SampleRate, 44100);
Assert.AreEqual(s.Channels, 2);
Assert.AreEqual(s.Length, 8192);
Assert.AreEqual(s.Channels * s.Length, s.Samples);
};
target.Start();
target.WaitForStop();
Assert.AreEqual(180224, target.FramesReceived);
Assert.AreEqual(705600, target.BytesReceived);
}
public void WaveFileAudioSourceConstructorTest()
{
string fileName = @"..\..\..\..\Unit Tests\Accord.Tests.Audio\Resources\Grand Piano - Fazioli - major A middle.wav";
WaveFileAudioSource target = new WaveFileAudioSource(fileName);
Signal s = null;
target.NewFrame += delegate(object sender, NewFrameEventArgs e)
{
if (s == null)
{
s = e.Signal;
}
Assert.AreEqual(s.SampleRate, 44100);
Assert.AreEqual(s.Channels, 2);
Assert.AreEqual(s.Length, 8192);
Assert.AreEqual(s.Channels * s.Length, s.Samples);
};
target.Start();
target.WaitForStop();
Assert.AreEqual(180224, target.FramesReceived);
Assert.AreEqual(705600, target.BytesReceived);
}
public void VoiceActivity_DetectFromFile()
{
// Initialize components and wire up pipeline.
using (var pipeline = Pipeline.Create(nameof(this.VoiceActivity_DetectFromFile)))
{
var vad = new SimpleVoiceActivityDetector(pipeline, new SimpleVoiceActivityDetectorConfiguration());
var audioInput = new WaveFileAudioSource(pipeline, "16kHz1chan.wav", null, 20);
audioInput.PipeTo(vad);
// Add results from outputs.
var results = new List <bool>();
vad.Out.Do(r => results.Add(r));
// Run pipeline and wait for completion.
pipeline.Run(null, false);
Assert.IsTrue(results.Count > 0, "No results!");
CollectionAssert.AreEqual(Enumerable.Repeat(false, 29).ToList(), results.GetRange(0, 29), "Initial silence detection failed!");
CollectionAssert.AreEqual(Enumerable.Repeat(true, 182).ToList(), results.GetRange(29, 182), "Voice activity detection failed!");
CollectionAssert.AreEqual(Enumerable.Repeat(false, 62).ToList(), results.GetRange(211, 62), "Trailing silence detection failed!");
}
}
/// <summary>
/// Tests speech recognition from any Wave file containing PCM audio in a format that the
/// speech recognizer component accepts.
/// </summary>
/// <param name="filename">The Wave file containing the audio data.</param>
/// <param name="expectedText">The expected recognized text.</param>
/// <param name="srgsXmlGrammar">The grammar to use when decoding.</param>
private void RecognizeSpeechFromWaveFile(string filename, string expectedText, string srgsXmlGrammar = null)
{
if (SpeechRecognitionEngine.InstalledRecognizers().Count == 0)
{
// Skip test if no installed recognizers on system.
return;
}
// Read the WaveFormat from the file header so we can set the recognizer configuaration.
WaveFormat format = WaveFileHelper.ReadWaveFileHeader(filename);
// Initialize components and wire up pipeline.
using (var pipeline = Pipeline.Create(nameof(this.RecognizeSpeechFromWaveFile)))
{
var recognizer = new SystemSpeechRecognizer(pipeline, new SystemSpeechRecognizerConfiguration()
{
BufferLengthInMs = 10000, InputFormat = format
});
var audioInput = new WaveFileAudioSource(pipeline, filename);
audioInput.Out.PipeTo(recognizer.In);
// Test dynamic update of speech recognition grammar
if (srgsXmlGrammar != null)
{
var grammarUpdater = Generators.Return <IEnumerable <string> >(pipeline, new string[] { srgsXmlGrammar });
grammarUpdater.PipeTo(recognizer.ReceiveGrammars);
}
// Add results from outputs. Note that we need to call DeepClone on each result as we
// do not want them to be resused by the runtime.
var results = new List <IStreamingSpeechRecognitionResult>();
recognizer.Out.Do(r => results.Add(r.DeepClone()));
recognizer.PartialRecognitionResults.Do(r => results.Add(r.DeepClone()));
// Run pipeline and wait for completion.
pipeline.Run();
Assert.IsTrue(results.Count > 0, "No recognition results!");
Assert.IsTrue(results.Count > 1, "No partial hypotheses!");
// Verify partial results.
for (int i = 0; i < results.Count - 1; ++i)
{
var partialResult = results[i];
Assert.IsFalse(partialResult.IsFinal);
Assert.IsTrue(partialResult.Confidence.HasValue);
Assert.IsTrue(partialResult.Confidence.Value > 0);
Assert.IsFalse(string.IsNullOrEmpty(partialResult.Text));
}
// Verify final results.
var finalResult = results.Last();
Assert.IsTrue(finalResult.IsFinal);
Assert.IsTrue(finalResult.Confidence.HasValue);
Assert.IsTrue(finalResult.Confidence.Value > 0);
Assert.AreEqual(expectedText, finalResult.Text, true);
Assert.IsTrue(finalResult.Alternates.Length > 0);
Assert.AreEqual(expectedText, finalResult.Alternates[0].Text, true);
Assert.AreEqual(finalResult.Alternates[0].Confidence.Value, finalResult.Confidence.Value);
Assert.IsTrue(finalResult.Audio.Length > 0);
}
}
