198 lines
4.9 KiB
Rust
198 lines
4.9 KiB
Rust
use std::path::Path;
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use amdemod::SquaringAMDemodulator;
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use aptsyncer::{APTSyncer, SyncedSample};
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use errors::DecoderError;
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use firfilter::FIRFilter;
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use resamplers::{Downsampler, Upsampler};
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use utils::float_sample_iterator;
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const LINES_PER_SECOND: u32 = 2;
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const PIXELS_PER_LINE: u32 = 2080;
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const LOWPASS_COEFFS: [f32; 63] = [
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-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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];
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pub fn decode<T>(
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input_file: &str,
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output_file: &str,
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progress_update: T,
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) -> Result<(), DecoderError>
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where
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T: Fn(f32, image::RgbaImage) -> (bool, u32),
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{
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let mut reader =
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hound::WavReader::open(input_file).map_err(|err| DecoderError::InputFileError(err))?;
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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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if sample_rate != 48000 {
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return Err(DecoderError::UnexpectedSamplingRate(sample_rate));
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}
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let sample_count = reader.len();
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let seconds = (sample_count as f32) / (sample_rate as f32);
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let lines = (seconds.ceil() as u32) * LINES_PER_SECOND;
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let mut img = image::DynamicImage::ImageLuma8(image::ImageBuffer::new(PIXELS_PER_LINE, lines));
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let coeffs = &LOWPASS_COEFFS;
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let samples = float_sample_iterator(&mut reader);
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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 syncer = APTSyncer::from(downsampler);
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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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let mut has_sync = false;
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let mut progress = 0;
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let pixel_count = sample_count * 13 / 150;
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let mut update_step = 10;
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let mut previous_sample = 0.0;
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for synced_sample in syncer {
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progress += 1;
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let sample = match synced_sample {
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SyncedSample::Sample(s) => s,
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SyncedSample::SyncA(s) => {
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if !has_sync {
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max_level = 0.0;
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has_sync = true;
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}
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x = 0;
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s
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}
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SyncedSample::SyncB(s) => {
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if x < (PIXELS_PER_LINE / 2) {
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let skip_distance = (PIXELS_PER_LINE / 2) - x;
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let color = (previous_sample / max_level * 255.0) as u8;
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for i in 0..skip_distance {
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img.as_mut_luma8()
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.unwrap()
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.put_pixel(x + i, y, image::Luma([color]));
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}
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}
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if !has_sync {
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max_level = 0.0;
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has_sync = true;
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}
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x = PIXELS_PER_LINE / 2;
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s
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}
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};
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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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if y < lines {
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img.as_mut_luma8()
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.unwrap()
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.put_pixel(x, y, image::Luma([color]));
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}
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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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previous_sample = sample;
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if progress % (PIXELS_PER_LINE * update_step) == 0 {
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let (cont, update_steps) =
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progress_update((progress as f32) / (pixel_count as f32), img.to_rgba8());
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if !cont {
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return Ok(());
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}
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let line_count = pixel_count / PIXELS_PER_LINE;
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update_step = if line_count / update_steps > 4 {
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line_count / update_steps
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} else {
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4
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}
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}
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}
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progress_update(1.0, img.to_rgba8());
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img.save_with_format(&Path::new(output_file), image::ImageFormat::Png)
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.map_err(|err| DecoderError::OutputFileError(err))?;
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Ok(())
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}
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