Update and added ReadMe

Cargo.lock

@@ -66,9 +66,9 @@ checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
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 dependencies = [
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- "redox_syscall",
+ "redox_syscall 0.2.4",
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+ "cfg-if 1.0.0",
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 [[package]]
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 [[package]]
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@@ -937,7 +936,7 @@ dependencies = [
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  "libc",
- "redox_syscall",
+ "redox_syscall 0.1.57",
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  "winapi",
 ]
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+]
+
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README.md

@@ -0,0 +1,15 @@
+# Frequency detector written in rust
+
+This project started out as a simple humming detector written in rust but, ended up becoming a frequency analyser that uses a Fourier transform to obtain the frequencies of the sound that is being recorded.
+
+But the main goals of the project were still accomplished:
+
+- Improve rust skills
+- Learn how to record audio using rust (in Linux)
+- Learn the mathematical bases of a Fourier transform
+
+#How to run
+
+```bash
+cargo run
+```

run.txt

@@ -1,690 +0,0 @@
-Audio Test:
-Geting audio input:
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src/main.rs

@@ -1,10 +1,10 @@
-use cpal::traits::{HostTrait, DeviceTrait, StreamTrait};
+use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
 use cpal::StreamInstant;
-use std::{thread, time};
-use std::sync::{Arc, Mutex};
-use std::sync::mpsc;
-use num_complex::Complex;
 use image::{ImageBuffer, RgbImage};
+use num_complex::Complex;
+use std::sync::mpsc;
+use std::sync::{Arc, Mutex};
+use std::{thread, time};
 
 #[derive(Debug)]
 struct MyRecData {
@@ -17,39 +17,26 @@ struct ProcessData {
     data: Vec<f32>,
 }
 
-const IMAGEX: u32 = 500;
+const IMAGEX: u32 = 200;
-const IMAGEY: u32 = 500;
+const IMAGEY: u32 = 100;
+const STEP: f32 = 20.0;
+const START_FREC: f32 = 200.0;
 
 fn generate_buffer() -> RgbImage {
-   
+    ImageBuffer::new(IMAGEX, IMAGEY)
-    let mut imgbuf: RgbImage = ImageBuffer::new(IMAGEX, IMAGEY);
-
-    for i in 0..IMAGEX {
-        *imgbuf.get_pixel_mut(i, 250) = image::Rgb([255,255,255]);
-    }
-    
-    //imgbuf.save("test.png").unwrap();
-    imgbuf
 }
 
 fn process(p_data: ProcessData, x: u32) {
     let time = p_data.duration.as_nanos() as f32 / (10.0_f32).powf(9.0);
-
-    let mut sum: Complex<f32> = Complex::new(0.0, 0.0);
-
-    let test_frec = 440.0f32;
-    
     let data_size = p_data.data.len() as u32;
-    let gragh_step = (data_size as f64 / (IMAGEX as f64 - 1.0f64)).floor() as u32;
+    let gragh_step = 20 as u32;
-
-    println!("gs:{}", gragh_step);
 
     let step = (time as f32 / data_size as f32) * gragh_step as f32;
 
     let mut i: u32 = 0;
     let mut max = 0.0f64;
 
-    while i < data_size && i/gragh_step < IMAGEX - 1 {
+    while i < data_size {
         if max < *p_data.data.get(i as usize).unwrap() as f64 {
             max = *p_data.data.get(i as usize).unwrap() as f64;
         }
@@ -60,29 +47,51 @@ fn process(p_data: ProcessData, x: u32) {
 
     let mut img_buff: RgbImage = generate_buffer();
 
-    i = 0;
+    let mut sum_vec: Vec<Complex<f32>> = vec![];
 
-    while i < data_size && i/gragh_step < IMAGEX - 1 {
+    for j in 0..(IMAGEX + 1) {
-        let y =  (250.0f64 - (*p_data.data.get(i as usize).unwrap() as f64 * scale).floor()) as u32;
+        let test_frec: f32 = j as f32 * STEP + START_FREC;
-        let to_sum = Complex::from_polar(*p_data.data.get(i as usize).unwrap() as f32 * scale as f32, - 2.0 * std::f32::consts::PI * test_frec * ( i as f32/gragh_step as f32) *  step);
+        i = 0;
-        sum += to_sum;
+        while i < data_size {
-        if y < 500 && y > 0 { 
+            let to_sum = Complex::from_polar(
-            *img_buff.get_pixel_mut((i/gragh_step) as u32, y ) = image::Rgb([0, 255, 255]);
+                *p_data.data.get(i as usize).unwrap() as f32 * scale as f32,
+                -2.0 * std::f32::consts::PI * test_frec * (i as f32 / gragh_step as f32) * step,
+            );
+            if sum_vec.get(j as usize).is_none() {
+                sum_vec.push(to_sum);
+            } else {
+                let a = *sum_vec.get(j as usize).unwrap();
+                let _ = std::mem::replace(&mut sum_vec[j as usize], a + to_sum);
             }
             i += gragh_step;
         }
-//    sum = sum.scale(1.0f32 / (data_size as f32 /gragh_step as f32));
-    if !sum.re.is_nan() && !sum.im.is_nan() {
-        println!("center: {}", (sum.im.powf(2.0) + sum.im.powf(2.0)).sqrt() )
     }
-    let x1 = sum.re + (IMAGEX/2) as f32;
+    let mut max = 0.0f32;
-    let y1 = sum.im + 250.0;
+    let mut average = 0.0f32;
-    if x1 > 0.0 && x1 < IMAGEX as f32 && y1 > 0.0 && y1 < 500.0 {
+    let mut possible = 0.0f32;
-        *img_buff.get_pixel_mut( x1 as u32, y1 as u32 ) = image::Rgb([255, 255, 255]);
+    for i in 0..IMAGEX {
-        //println!("center");
+        let v: Complex<f32> = *sum_vec.get(i as usize).unwrap();
+        if !v.is_nan() {
+            let v = (v.re.powf(2.0) + v.im.powf(2.0)).sqrt();
+            if max < v {
+                max = v;
+                possible = START_FREC + STEP * i as f32;
+            }
+            average += v;
+        }
+    }
+    average = IMAGEY as f32 - (average / IMAGEX as f32) / max * (IMAGEY - 10) as f32;
+    for i in 0..IMAGEX {
+        let v: Complex<f32> = *sum_vec.get(i as usize).unwrap();
+        if !v.is_nan() {
+            let j = IMAGEY as f32
+                - ((v.re.powf(2.0) + v.im.powf(2.0)).sqrt() / max) * (IMAGEY - 10) as f32;
+            *img_buff.get_pixel_mut(i as u32, j.floor() as u32) = image::Rgb([255, 0, 255]);
+            *img_buff.get_pixel_mut(i as u32, average as u32) = image::Rgb([255, 0, 0]);
+        }
     }
 
-    println!("Processed {}", x);
+    println!("Processed {} {}", x, possible);
 
     img_buff.save(format!("run/process{}.png", x)).unwrap();
 }
@@ -94,7 +103,6 @@ fn process(p_data: ProcessData, x: u32) {
 //}
 
 fn main() {
-
     println!("Audio Test:");
 
     let host = cpal::default_host();
@@ -106,23 +114,38 @@ fn main() {
 
     println!("Geting audio input:");
 
-    let device = host.default_input_device().expect("no output device available!");
+    let device = host
+        .default_input_device()
+        .expect("no output device available!");
 
-    let mut supported_configs_range = device.supported_input_configs().expect("Error while geting the configs");
+    let mut supported_configs_range = device
-    let supported_config = supported_configs_range.next().expect("no supported config").with_max_sample_rate().into();
+        .supported_input_configs()
+        .expect("Error while geting the configs");
+    let supported_config = supported_configs_range
+        .next()
+        .expect("no supported config")
+        .with_max_sample_rate()
+        .into();
 
     println!("Got config: {:?}", supported_config);
 
-    let stream = device.build_input_stream(&supported_config,
+    let stream = device
+        .build_input_stream(
+            &supported_config,
             move |data: &[f32], input_info: &cpal::InputCallbackInfo| {
                 //            println!("Data:\n Input info:{:?}",  input_info.timestamp().capture);
-            let mdata = MyRecData {instant: input_info.timestamp().capture, data: data.to_vec()};
+                let mdata = MyRecData {
+                    instant: input_info.timestamp().capture,
+                    data: data.to_vec(),
+                };
                 rec_data_c.lock().ok().unwrap().insert(0, mdata);
                 ()
             },
             move |err| {
                 println!("Error: {:?}", err);
-    }).expect("Failed to build stream");
+            },
+        )
+        .expect("Failed to build stream");
 
     stream.play().expect("faild to play");
 
@@ -165,7 +188,13 @@ fn main() {
                     last = Some(mdata.instant);
                 } else {
                     let instant = mdata.instant.duration_since(&last.unwrap()).unwrap();
-                    process(ProcessData {duration: instant, data: mdata.data}, x);
+                    process(
+                        ProcessData {
+                            duration: instant,
+                            data: mdata.data,
+                        },
+                        x,
+                    );
                     last = Some(mdata.instant);
                     //                    println!("time:{:?}", instant);
                 }
@@ -174,12 +203,11 @@ fn main() {
         println!("Stoped processing");
     });
 
-    thread::sleep(time::Duration::from_secs(2));
+    thread::sleep(time::Duration::from_secs(30));
 
     stream.pause().expect("faild to close");
 
     println!("stoping");
     m_t.send(false).ok();
     t.join().unwrap();
-
 }