using NAudio.Wave;

using NUnit.Framework;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Spectrogram.Tests

{

class WavUsingLibrary

{

[Test]

public void Test_WavFile_ReadASehgal()

{

// READ THE WAV FILE WITH NAUDIO

double[] audio;

int sampleRate;

string wavFilePath = "../../../../../data/asehgal-original.wav";

using (var audioFileReader = new AudioFileReader(wavFilePath))

{

sampleRate = audioFileReader.WaveFormat.SampleRate;

var wholeFile = new List<float>((int)(audioFileReader.Length / 4));

var readBuffer = new float[audioFileReader.WaveFormat.SampleRate * audioFileReader.WaveFormat.Channels];

int samplesRead = 0;

while ((samplesRead = audioFileReader.Read(readBuffer, 0, readBuffer.Length)) > 0)

wholeFile.AddRange(readBuffer.Take(samplesRead));

audio = Array.ConvertAll(wholeFile.ToArray(), x => (double)x);

}

// TEST VALUES ARE WHAT WE EXPECT

double lengthSec = (double)audio.Length / sampleRate;

Assert.AreEqual(40_000, sampleRate);

Assert.AreEqual(40, lengthSec, .01);

// CREATE THE SPECTROGRAM

int fftSize = 8192;

var spec = new Spectrogram(sampleRate, fftSize, stepSize: 4_000, maxFreq: 2_000);

spec.Add(audio);

spec.SaveImage("asehgal.png", intensity: 10_000, dB: true);

}

}

}