【光雅集】3

audio 时频绘图

yum -y install freetype-devel libxml2-devel expat-devel

[root@localhost mysoul]# ls
Cargo.lock  Cargo.toml  src  target  test

[root@localhost mysoul]# cat Cargo.toml 
[package]
name = "mysoul"
version = "0.1.0"
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
png = "0.16.8"
minimp3 = "0.5.1"
audio-visualizer = "0.2.2"

[root@localhost mysoul]# cat src/main.rs 
use minimp3::{Decoder as Mp3Decoder, Frame as Mp3Frame, Error as Mp3Error};
use audio_visualizer::ChannelInterleavement;
use audio_visualizer::Channels;
use audio_visualizer::waveform::staticc::png_file::waveform_static_png_visualize;
use std::path::PathBuf;
use std::fs::File;
use std::collections::BTreeMap;
use audio_visualizer::spectrum::staticc::png_file::spectrum_static_png_visualize;

fn main() {
    let mut path = PathBuf::new();
    path.push("test/samples");
    path.push("mysoul.mp3");
    let mut decoder = Mp3Decoder::new(File::open(path).unwrap());

    let mut lrlr_mp3_samples = vec![];
    loop {
        match decoder.next_frame() {
            Ok(Mp3Frame { data: samples_of_frame, .. }) => {
                for sample in samples_of_frame {
                    lrlr_mp3_samples.push(sample);
                }
            }
            Err(Mp3Error::Eof) => break,
            Err(e) => panic!("{:?}", e),
        }
    }

    waveform_static_png_visualize(
        &lrlr_mp3_samples,
        Channels::Stereo(ChannelInterleavement::LRLR),
        "test/out",
        "mysoul_waveform.png"
    );

    let mut spec = BTreeMap::new();

    spectrum_static_png_visualize(
        &spec,
        "test/out",
        "mysoul_spectrum.png",
        &[]
    );
}

[root@localhost mysoul]# ls test
out  samples
​

左右声道可见

频率不可见

使用 spek 可见

对比频率图表

以 A4=440Hz 为准

🙋
如何表格中上色？