using NUnit.Framework;

using System;

using System.Collections.Generic;

using System.Linq;

namespace Spectrogram.Tests

{

public class Quickstart

{

[Test]

public void Test_Quickstart_Hal()

{

(double[] audio, int sampleRate) = AudioFile.ReadWAV("../../../../../data/cant-do-that-44100.wav");

var sg = new SpectrogramGenerator(sampleRate, fftSize: 4096, stepSize: 500, maxFreq: 3000);

sg.Add(audio);

sg.SaveImage("../../../../../dev/graphics/hal.png");

Console.WriteLine(sg);

}

[Test]

public void Test_Readme_HeaderImage()

{

(double[] audio, int sampleRate) = AudioFile.ReadWAV("../../../../../data/cant-do-that-44100.wav");

int fftSize = 2048;

var spec = new SpectrogramGenerator(sampleRate, fftSize, stepSize: 400, maxFreq: 6000);

spec.Add(audio);

spec.SaveImage("../../../../../dev/graphics/hal-spectrogram.png", intensity: 10, dB: true, dBScale: .05);

Console.WriteLine(spec);

}

[Test]

public void Test_Quickstart_Handel()

{

double[] audio = AudioFile.ReadMP3("../../../../../data/Handel - Air and Variations.mp3");

int sampleRate = 44100;

int fftSize = 16384;

int targetWidthPx = 3000;

int stepSize = audio.Length / targetWidthPx;

var sg = new SpectrogramGenerator(sampleRate, fftSize, stepSize, maxFreq: 2200);

sg.Add(audio);

sg.SaveImage("../../../../../dev/graphics/spectrogram-song.png", intensity: 5, dB: true);

Console.WriteLine(sg);

/*

Spectrogram (2993, 817)

Vertical (817 px): 0 - 2,199 Hz, FFT size: 16,384 samples, 2.69 Hz/px

Horizontal (2993 px): 2.96 min, window: 0.37 sec, step: 0.06 sec, overlap: 84%

*/

}

}

}