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feat: private functions && fix reverb

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HiveBeats
2022-11-01 11:19:46 +04:00
parent 9d37e057d7
commit 4edafbe664
5 changed files with 25 additions and 24 deletions
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25
SoundGen/Fx.fs
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@@ -1,5 +1,5 @@
module SoundGen.Fx module SoundGen.Fx
open Settings
type Effect = type Effect =
| Saturator | Saturator
| Reverb | Reverb
@@ -9,21 +9,22 @@ type Saturator = { Gain: float }
let saturate (param: Saturator, x: float) = tanh (param.Gain * x) let saturate (param: Saturator, x: float) = tanh (param.Gain * x)
let sineWaveShape gain factor x = let sineWaveShape gain factor x = x + gain * sin (factor * x)
x + gain * sin (factor * x)
let reverb (buffer: float seq) =
let delayMilliseconds = 500.//((1./8.) * beatDuration) // 500 is half a second
let delaySamples =
(delayMilliseconds * 48.0) |> int // assumes 44100 Hz sample rate
let reverb (buffer:float seq) =
let delayMilliseconds = 50.; // 500 is half a second
let delaySamples = (delayMilliseconds * 48.0) |> int; // assumes 44100 Hz sample rate
let decay = 0.5 let decay = 0.5
let mutable newBuffer = Array.ofSeq buffer let mutable newBuffer = Array.ofSeq buffer
for i in 0..Seq.length buffer do for i in 0 .. Seq.length buffer do
let smpl = newBuffer.[i] * decay
if Array.length newBuffer > (i + delaySamples) then if Array.length newBuffer > (i + delaySamples) then
let smpl = newBuffer.[i] * decay
newBuffer.[i + delaySamples] <- smpl newBuffer.[i + delaySamples] <- smpl
else newBuffer <- Array.append newBuffer (smpl |> Array.singleton) //else newBuffer <- Array.append newBuffer (smpl |> Array.singleton)
newBuffer
Seq.zip buffer newBuffer
|> Seq.map (fun (x, y) -> x + y * 0.8)

2
SoundGen/Oscillator.fs
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@@ -18,7 +18,7 @@ type GenerationParameter =
let pos hz x = (hz * x / sampleRate) % 1. let private pos hz x = (hz * x / sampleRate) % 1.
let sineosc hz x = let sineosc hz x =
x |> (*) (2. * Math.PI * hz / sampleRate) |> sin x |> (*) (2. * Math.PI * hz / sampleRate) |> sin

4
SoundGen/PCMWave.fs
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@@ -2,10 +2,10 @@ module SoundGen.PCMWave
open Settings open Settings
open System.IO open System.IO
let toInt16Sample sample = sample |> (*) 32767. |> int16 let private toInt16Sample sample = sample |> (*) 32767. |> int16
let pack (d: int16 []) = let private pack (d: int16 []) =
let stream = new MemoryStream() let stream = new MemoryStream()
let writer = let writer =

2
SoundGen/Program.fs
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@@ -55,9 +55,9 @@ let writeToFile (ms: MemoryStream) =
ms.WriteTo(fs) ms.WriteTo(fs)
song song
//|> reverb
|> Seq.map (fun x -> |> Seq.map (fun x ->
let x1 = sineWaveShape 1.5 2.5 x let x1 = sineWaveShape 1.5 2.5 x
saturate ({ Gain = 1.0 }, x1)) saturate ({ Gain = 1.0 }, x1))
//|> reverb
|> createWAV |> createWAV
|> writeToFile |> writeToFile

12
SoundGen/Synth.fs
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@@ -4,10 +4,10 @@ open Settings
open Oscillator open Oscillator
open SoundGen.Oscillator open SoundGen.Oscillator
let getHzBySemitones semi = let private getHzBySemitones semi =
pitchStandard * (2. ** (1. / 12.)) ** semi pitchStandard * (2. ** (1. / 12.)) ** semi
let getSemitonesByNote (str: string) = let private getSemitonesByNote (str: string) =
let defaultOctave = 4 let defaultOctave = 4
let notes = let notes =
@@ -34,7 +34,7 @@ let getSemitonesByNote (str: string) =
(octave - defaultOctave - 1) * 12 + noteShift (octave - defaultOctave - 1) * 12 + noteShift
let freq hz duration (osc: OscillatorParameter list) = let private freq hz duration (osc: OscillatorParameter list) =
let samples = let samples =
seq { 0.0 .. (duration * sampleRate) } seq { 0.0 .. (duration * sampleRate) }
@@ -70,11 +70,11 @@ let freq hz duration (osc: OscillatorParameter list) =
let note semitone beats = let note semitone beats =
let hz = getHzBySemitones (semitone - 12.) let hz = getHzBySemitones (semitone)
freq freq
hz hz
(beats * beatDuration) (beats * beatDuration)
[ { Osc = Sine; Freq = hz / 4. } [ { Osc = Sine; Freq = hz / 4. };
{ Osc = Saw; Freq = (hz + 1.) } { Osc = Saw; Freq = (hz + 1.) };
{ Osc = Saw; Freq = (hz - 1.3) } ] { Osc = Saw; Freq = (hz - 1.3) } ]