141 lines
3.2 KiB
Rust
141 lines
3.2 KiB
Rust
extern crate hound;
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extern crate image;
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mod utils;
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mod sinegen;
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mod firfilter;
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mod resamplers;
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mod mixer;
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mod amdemod;
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use std::fs::File;
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use std::path::Path;
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use utils::float_sample_iterator;
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use firfilter::FIRFilter;
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use amdemod::SquaringAMDemodulator;
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use resamplers::{Upsampler, Downsampler};
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const LINES_PER_SECOND: u32 = 2;
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const PIXELS_PER_LINE: u32 = 2080;
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fn main() {
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let mut reader = match hound::WavReader::open("noaa19_20160814_mono.wav") {
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Err(e) => panic!("Could not open inputfile: {}", e),
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Ok(r) => r
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};
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if reader.spec().channels != 1 {
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panic!("Expected a mono file");
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}
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let sample_rate = reader.spec().sample_rate;
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println!("Samplerate: {}", sample_rate);
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if sample_rate != 48000 {
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panic!("Expected a 48kHz sample rate");
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}
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println!("{} Samples", reader.len());
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let seconds = (reader.len() as f32) / (sample_rate as f32);
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let lines = (seconds.ceil() as u32) * LINES_PER_SECOND;
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println!("{} or {} lines", seconds, lines);
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let mut img = image::ImageBuffer::new(PIXELS_PER_LINE, lines);
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let samples = float_sample_iterator(&mut reader);
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let coeffs = vec![ -7.383784e-03,
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-3.183046e-03,
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2.255039e-03,
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7.461166e-03,
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1.091908e-02,
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1.149109e-02,
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8.769802e-03,
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3.252932e-03,
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-3.720606e-03,
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-1.027446e-02,
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-1.447403e-02,
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-1.486427e-02,
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-1.092423e-02,
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-3.307958e-03,
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6.212477e-03,
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1.511364e-02,
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2.072873e-02,
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2.096037e-02,
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1.492345e-02,
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3.347624e-03,
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-1.138407e-02,
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-2.560252e-02,
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-3.507114e-02,
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-3.591225e-02,
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-2.553830e-02,
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-3.371569e-03,
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2.882645e-02,
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6.711368e-02,
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1.060042e-01,
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1.394643e-01,
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1.620650e-01,
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1.700462e-01,
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1.620650e-01,
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1.394643e-01,
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1.060042e-01,
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6.711368e-02,
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2.882645e-02,
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-3.371569e-03,
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-2.553830e-02,
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-3.591225e-02,
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-3.507114e-02,
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-2.560252e-02,
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-1.138407e-02,
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3.347624e-03,
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1.492345e-02,
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2.096037e-02,
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2.072873e-02,
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1.511364e-02,
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6.212477e-03,
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-3.307958e-03,
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-1.092423e-02,
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-1.486427e-02,
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-1.447403e-02,
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-1.027446e-02,
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-3.720606e-03,
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3.252932e-03,
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8.769802e-03,
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1.149109e-02,
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1.091908e-02,
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7.461166e-03,
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2.255039e-03,
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-3.183046e-03,
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-7.383784e-03];
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let demod = SquaringAMDemodulator::from(samples);
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let filter = FIRFilter::from(demod, coeffs);
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let upsampler = Upsampler::from(filter, 13);
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let downsampler = Downsampler::from(upsampler, 150);
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let mut x = 0;
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let mut y = 0;
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let mut max_level = 0.0;
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for sample in downsampler {
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max_level = f32::max(sample, max_level);
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let color = (sample / max_level * 255.0) as u8;
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println!("{}", color);
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img.put_pixel(x,y,image::Luma([color]));
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x += 1;
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if x > PIXELS_PER_LINE {
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x = 0;
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y += 1;
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}
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}
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let ref mut fout = File::create(&Path::new("decoded.png")).unwrap();
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image::ImageLuma8(img).save(fout, image::PNG).unwrap();
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}
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