119 lines
2.7 KiB
Rust
119 lines
2.7 KiB
Rust
extern crate hound;
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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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use utils::float_sample_iterator;
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use sinegen::SineGenerator;
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use firfilter::FIRFilter;
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use mixer::Mixer;
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fn main() {
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let carrier_freq = 2400.0;
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let sample_freq = 48000.0;
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let mut reader = match hound::WavReader::open("noaa19_short.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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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 sine_gen = SineGenerator::new(carrier_freq, 1.0, sample_freq);
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let mixer = Mixer::from(sine_gen, samples);
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let filter = FIRFilter::from(mixer, coeffs);
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let spec = hound::WavSpec {
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channels: 1,
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sample_rate: 48000,
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bits_per_sample: 32,
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sample_format: hound::SampleFormat::Int,
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};
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let mut writer = hound::WavWriter::create("demod.wav", spec).unwrap();
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for sample in filter {
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//println!("{}", sample);
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let amplitude = (i32::max_value() as f32) * 0.8; //About 1dB headroom
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writer.write_sample((sample * amplitude) as i32).unwrap();
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}
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}
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