private void TestPitchDetection(Func <int, IAudioSamplesAnalyzer> audioSamplesAnalyzerProvider)
{
MicProfile micProfile = CreateDummyMicProfile();
string assetsPath = Application.dataPath;
string sineWaveToneDir = assetsPath + "/Common/Audio/SineWaveTones/";
Dictionary <string, string> pathToExpectedMidiNoteNameMap = new();
pathToExpectedMidiNoteNameMap.Add(sineWaveToneDir + "sine-wave-a3-220hz.ogg", "A3");
pathToExpectedMidiNoteNameMap.Add(sineWaveToneDir + "sine-wave-a4-440hz.ogg", "A4");
pathToExpectedMidiNoteNameMap.Add(sineWaveToneDir + "sine-wave-a5-880hz.ogg", "A5");
pathToExpectedMidiNoteNameMap.Add(sineWaveToneDir + "sine-wave-c2-61,74hz.ogg", "C2");
pathToExpectedMidiNoteNameMap.Add(sineWaveToneDir + "sine-wave-c4-261,64hz.ogg", "C4");
pathToExpectedMidiNoteNameMap.Add(sineWaveToneDir + "sine-wave-c6-1046,50hz.ogg", "C6");
foreach (KeyValuePair <string, string> pathAndNoteName in pathToExpectedMidiNoteNameMap)
{
// Load the audio clip
string uri = "file://" + pathAndNoteName.Key;
AudioClip audioClip = AudioUtils.GetAudioClipUncached(uri, false);
float[] samples = new float[audioClip.samples];
audioClip.GetData(samples, 0);
// Analyze the samples
IAudioSamplesAnalyzer audioSamplesAnalyzer = audioSamplesAnalyzerProvider(audioClip.frequency);
PitchEvent pitchEvent = audioSamplesAnalyzer.ProcessAudioSamples(samples, 0, samples.Length - 1, micProfile);
// Check result
Assert.NotNull(pitchEvent, $"No pitch detected when analyzing audio resource {uri}");
string expectedName = pathAndNoteName.Value;
string analyzedName = MidiUtils.GetAbsoluteName(pitchEvent.MidiNote);
Assert.AreEqual(expectedName, analyzedName,
$"Expected {expectedName} but was {analyzedName} when analyzing audio resource {uri}");
}
}
private void OnRecordingEvent(RecordingEvent recordingEvent)
{
// Detect the pitch of the sample
int newSampleLength = recordingEvent.NewSamplesEndIndex - recordingEvent.NewSamplesStartIndex;
bufferedNotAnalyzedSampleCount += newSampleLength;
// Wait until enough new samples are buffered
if (bufferedNotAnalyzedSampleCount < MinSampleCountToUse)
{
return;
}
// Do not analyze more than necessary
if (bufferedNotAnalyzedSampleCount > MaxSampleCountToUse)
{
bufferedNotAnalyzedSampleCount = MaxSampleCountToUse;
}
// Analyze the newest portion of the not-yet-analyzed MicSamples
int startIndex = recordingEvent.MicSamples.Length - bufferedNotAnalyzedSampleCount;
int endIndex = recordingEvent.MicSamples.Length;
PitchEvent pitchEvent = audioSamplesAnalyzer.ProcessAudioSamples(recordingEvent.MicSamples, startIndex, endIndex, MicProfile);
bufferedNotAnalyzedSampleCount = 0;
// Notify listeners
pitchEventStream.OnNext(pitchEvent);
}