commit 5b8c7aa17b9e3e52d47285f487affb5770057aab
Author: HiveBeats <38073817+HiveBeats@users.noreply.github.com>
Date:   Sun Oct 30 21:19:07 2022 +0400

    feat: initial soundgen

diff --git a/.idea/.idea.SoundGen/.idea/.gitignore b/.idea/.idea.SoundGen/.idea/.gitignore
new file mode 100644
index 0000000..e7f936f
--- /dev/null
+++ b/.idea/.idea.SoundGen/.idea/.gitignore
@@ -0,0 +1,13 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Rider ignored files
+/modules.xml
+/contentModel.xml
+/projectSettingsUpdater.xml
+/.idea.SoundGen.iml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/SoundGen/Program.fs b/SoundGen/Program.fs
new file mode 100644
index 0000000..1f4d004
--- /dev/null
+++ b/SoundGen/Program.fs
@@ -0,0 +1,224 @@
+module SoundGen
+open System.IO
+
+let sampleRate = 48000.
+let bpm = 128.
+let beatDuration = 60. / bpm
+let pitchStandard = 440.
+let volume = 0.5
+let attackMs = 100.
+
+let getHzBySemitones semi =
+     pitchStandard * (2. ** (1. / 12.)) ** semi
+let getSemitonesByNote (str:string) =
+    let defaultOctave = 4
+    let notes = ["A"; "A#"; "B"; "C"; "C#"; "D"; "D#"; "E"; "F"; "F#"; "G"; "G#" ] |> List.toArray
+    let octave = str.Substring(str.Length - 1) |> int
+    let noteShift = Array.findIndex (fun e -> e = str.Substring(0, str.Length - 1)) notes
+    (octave - defaultOctave - 1) * 12 + noteShift
+  
+let toInt16Sample sample = sample |> (*) 32767. |> int16
+
+let freq hz duration = 
+    let samples = seq { 0.0..(duration * sampleRate) }
+    let attack =
+        let samplesToRise = (sampleRate * (0.001 * attackMs));
+        let risingDelta = 1. / samplesToRise
+        let mutable i = 0.
+        seq {   while true do 
+                 i <- i + risingDelta
+                 yield min i 1.
+                 }
+        
+    let output = Seq.map
+                    (fun x -> x
+                              |> (*) (2. * System.Math.PI * hz / sampleRate)
+                              |> sin
+                              |> (*) volume
+                              )
+                    samples
+                    
+    let adsrLength = Seq.length output
+    let attackArray = attack |> Seq.take adsrLength
+    let release = Seq.rev attackArray
+    Seq.zip3 release attackArray output
+    |> Seq.map (fun (x, y, z) -> (x * y * z) |> toInt16Sample)
+        
+    
+let note semitone beats =
+    let hz = getHzBySemitones semitone
+    freq hz (beats * beatDuration)
+    
+let song =
+    [
+     //
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.5
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25
+     note 0 0.25;
+     note 0 0.5;
+     
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25
+     note 5 0.25;
+     note 5 0.5;
+     
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25
+     note 3 0.25;
+     note 3 0.5
+     note (-2) 0.5
+     //
+     //
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.5
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25
+     note 0 0.25;
+     note 0 0.5;
+     
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25
+     note 5 0.25;
+     note 5 0.5;
+     
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25
+     note 3 0.25;
+     note 3 0.5
+     note (-2) 0.5
+     //
+     //
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.5
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25
+     note 0 0.25;
+     note 0 0.5;
+     
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25
+     note 5 0.25;
+     note 5 0.5;
+     
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25
+     note 3 0.25;
+     note 3 0.5
+     note (-2) 0.5
+     //
+     //
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.5
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25;
+     note 0 0.25
+     note 0 0.25;
+     note 0 0.5;
+     
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25;
+     note 5 0.25
+     note 5 0.25;
+     note 5 0.5;
+     
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25;
+     note 3 0.25
+     note 3 0.25;
+     note 3 0.5
+     note (-2) 0.5
+     //
+     ] |> Seq.concat 
+    
+let pack (d:int16[]) = 
+    let stream = new MemoryStream();
+    let writer = new BinaryWriter(stream, System.Text.Encoding.ASCII);
+    let dataLength = Array.length d * 2
+
+    // RIFF
+    writer.Write(System.Text.Encoding.ASCII.GetBytes("RIFF"))
+    writer.Write(Array.length d)
+    writer.Write(System.Text.Encoding.ASCII.GetBytes("WAVE"))
+
+    // fmt
+    let sr = sampleRate |> int
+    writer.Write(System.Text.Encoding.ASCII.GetBytes("fmt "))
+    writer.Write(16)
+    writer.Write(1s)        // PCM
+    writer.Write(1s)        // mono
+    writer.Write(sr)     // sample rate
+    writer.Write(sr * 16 / 8)     // byte rate
+    writer.Write(2s)        // bytes per sample
+    writer.Write(16s)       // bits per sample
+
+    // data
+    writer.Write(System.Text.Encoding.ASCII.GetBytes("data"))
+    writer.Write(dataLength)
+    let data:byte[] = Array.zeroCreate dataLength
+    System.Buffer.BlockCopy(d, 0, data, 0, dataLength)
+    writer.Write(data)
+    stream
+    
+let write (ms:MemoryStream) =
+    use fs = new FileStream(Path.Combine(__SOURCE_DIRECTORY__,"test.wav"), FileMode.Create)
+    ms.WriteTo(fs)
+    
+song |> Seq.toArray |> pack |> write
+
+
+
+
+// let drawWave(freq, duration) =
+//     Chart.Line(seq { 1. .. (duration * sampleRate) }, sound)
+//     |> Chart.saveHtml("chart.html")
+// drawWave(440., 1.)
+
+
+    
\ No newline at end of file