audio_samples 2.0.0

A typed audio processing library for Rust that treats audio as a first-class, invariant-preserving object rather than an unstructured numeric buffer.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71

#[cfg(not(feature = "plotting"))]
fn main() {
    eprintln!("error: This example requires the `plotting` feature.");
    std::process::exit(1);
}

#[cfg(feature = "plotting")]
fn main() -> audio_samples::AudioSampleResult<()> {
    use audio_samples::operations::AudioPlotting;
    use audio_samples::operations::plotting::{PlotUtils, spectrum::MagnitudeSpectrumParams};
    use audio_samples::sample_rate;
    use audio_samples::utils::MonoSampleBuilder;
    use std::time::Duration;

    println!("Testing MagnitudeSpectrumPlot...");

    // Generate a signal with multiple frequency components
    // 440 Hz (A4), 880 Hz (A5), 1320 Hz (E6)
    let duration = Duration::from_secs_f32(1.0);
    let audio = MonoSampleBuilder::<f32>::new(sample_rate!(44100))
        .sine_wave(440.0, duration, 0.5)
        .sine_wave(880.0, duration, 0.5)
        .sine_wave(1320.0, duration, 0.5)
        .build()?;

    // Test 1: dB scale spectrum (default)
    println!("Creating magnitude spectrum (dB scale)...");
    let spec_db = audio.plot_magnitude_spectrum(&MagnitudeSpectrumParams::db())?;
    let html_db = spec_db.html()?;
    println!("Rendered dB spectrum ({} bytes)", html_db.len());

    // Test 2: Linear scale spectrum
    println!("Creating magnitude spectrum (linear scale)...");
    let spec_linear = audio.plot_magnitude_spectrum(&MagnitudeSpectrumParams::linear())?;
    let html_linear = spec_linear.html()?;
    println!("Rendered linear spectrum ({} bytes)", html_linear.len());

    // Test 3: Zoom into frequency range of interest (0-2000 Hz)
    println!("Creating zoomed magnitude spectrum...");
    let mut params_zoomed = MagnitudeSpectrumParams::db();
    params_zoomed.freq_range = Some((0.0, 2000.0));
    let spec_zoomed = audio.plot_magnitude_spectrum(&params_zoomed)?;
    let html_zoomed = spec_zoomed.html()?;
    println!("Rendered zoomed spectrum ({} bytes)", html_zoomed.len());

    for (name, html) in [
        ("db", &html_db),
        ("linear", &html_linear),
        ("zoomed", &html_zoomed),
    ] {
        assert!(
            !html.is_empty() && html.contains("plotly"),
            "{name} magnitude spectrum HTML should be a non-empty Plotly document"
        );
    }

    // Test 4: Show in browser
    #[cfg(feature = "html_view")]
    {
        println!("Opening dB spectrum in browser...");
        spec_db.show()?;
    }

    #[cfg(not(feature = "html_view"))]
    {
        println!("Note: Enable 'html_view' feature to open in browser");
    }

    println!("All magnitude spectrum tests passed!");
    Ok(())
}