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Fix audio that was fucked up since the beginning

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This commit is contained in:
Alessandro Proto 2023-02-14 21:05:15 +01:00
parent 5e95e74545
commit e3616e4ac6
3 changed files with 58 additions and 102 deletions
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2
Capy64/Assets/bios.lua
View file

@ -241,7 +241,7 @@ local function bootScreen()
end
end
audio.beep(1000, 0.4, 0.2, "square")
audio.beep(1000, 0.2, 0.2, "square")
if shouldInstallOS() then
installOS()

144
Capy64/Core/Audio.cs
View file

@ -4,6 +4,8 @@ using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
@ -12,6 +14,15 @@ namespace Capy64.Core;
public class Audio : IDisposable
{
public enum Waveform
{
Sine,
Square,
Triangle,
Sawtooth,
Noise
}
public const int SampleRate = 48000;
public const AudioChannels Channels = AudioChannels.Mono;
public readonly DynamicSoundEffectInstance Sound;
@ -19,7 +30,6 @@ public class Audio : IDisposable
private static readonly Random rng = new();
public Audio()
{
GenerateSawtoothWave(440, 1);
Sound = new DynamicSoundEffectInstance(SampleRate, Channels);
}
@ -29,77 +39,63 @@ public class Audio : IDisposable
return Sound.GetSampleDuration(buffer.Length);
}
public static byte[] GenerateSineWave(double frequency, double time, double volume = 1d)
public byte[] GenerateWave(Waveform form, double frequency, TimeSpan time)
{
var amplitude = 128 * volume;
var timeStep = 1d / SampleRate;
var size = Sound.GetSampleSizeInBytes(time);
var buffer = new byte[size];
var buffer = new byte[(int)(SampleRate * time)];
var ctime = 0d;
for (int i = 0; i < buffer.Length; i++)
var step = 1d / SampleRate;
double x = 0;
for (int i = 0; i < size; i += 2)
{
double angle = (Math.PI * frequency) * ctime;
double factor = 0.5 * (Math.Sin(angle) + 1.0);
buffer[i] = (byte)(amplitude * factor);
ctime += timeStep;
var value = form switch
{
Waveform.Sine => GetSinePoint(frequency, x),
Waveform.Square => GetSquarePoint(frequency, x),
Waveform.Triangle => GetTrianglePoint(frequency, x),
Waveform.Sawtooth => GetSawtoothPoint(frequency, x),
Waveform.Noise => rng.NextDouble() * 2 - 1,
_ => throw new NotImplementedException(),
};
Console.WriteLine(value);
value = Math.Clamp(value, -1, 1);
var sample = (short)(value >= 0.0f ? value * short.MaxValue : value * short.MinValue * -1);
if (!BitConverter.IsLittleEndian)
{
buffer[i] = (byte)(sample >> 8);
buffer[i + 1] = (byte)sample;
}
else
{
buffer[i] = (byte)sample;
buffer[i + 1] = (byte)(sample >> 8);
}
x += step;
}
return buffer;
}
public static double GetSinePoint(double frequency, double x)
{
return Math.Sin(x * 2 * Math.PI * frequency);
}
private static double GetSquarePoint(double frequency, double x)
{
double v = 0;
for (int k = 1; k <= 50; k++)
{
v += 1 / (2 * k - 1) * Math.Sin(frequency * 2 * Math.PI * (2 * k - 1) * x) / 2 + 0.5;
}
return v;
}
public static byte[] GenerateSquareWave(double frequency, double time, double volume = 1d)
{
var amplitude = 128 * volume;
var timeStep = 1d / SampleRate;
frequency /= 2;
var buffer = new byte[(int)(SampleRate * time)];
var ctime = 0d;
for (int i = 0; i < buffer.Length; i++)
{
var v = GetSquarePoint(frequency, ctime);
buffer[i] = (byte)(v * amplitude);
ctime += timeStep;
}
return buffer;
double v = GetSinePoint(frequency, x);
return v > 0 ? 1 : -1;
}
private static double GetTrianglePoint(double frequency, double x)
{
double v = 0;
for (int k = 1; k <= 50; k++)
for (int k = 1; k <= 25; k++)
{
v += (Math.Pow(-1, k) / Math.Pow(2 * k - 1, 2))
* Math.Sin(2 * Math.PI * (frequency * 2 * k - 1) * x)
/ 2 + 0.5;
* Math.Sin(frequency * 2 * Math.PI * (2 * k - 1) * x);
}
return -(8 / (Math.PI * Math.PI)) * v;
}
public static byte[] GenerateTriangleWave(double frequency, double time, double volume = 1d)
{
var amplitude = 128 * volume;
var timeStep = 1d / SampleRate;
frequency /= 2;
var buffer = new byte[(int)(SampleRate * time)];
var ctime = 0d;
for (int i = 0; i < buffer.Length; i++)
{
var x = GetTrianglePoint(frequency, ctime);
buffer[i] = (byte)(amplitude * x);
ctime += timeStep;
}
return buffer;
return -(8 / Math.Pow(Math.PI, 2)) * v;
}
private static double GetSawtoothPoint(double frequency, double x)
@ -107,43 +103,9 @@ public class Audio : IDisposable
double v = 0;
for (int k = 1; k <= 50; k++)
{
v += (Math.Pow(-1, k) / k) * Math.Sin(frequency * 2 * Math.PI * k * x)
/ 4 + 0.5;
v += (Math.Pow(-1, k) / k) * Math.Sin(frequency * 2 * Math.PI * k * x);
}
return -v;
}
public static byte[] GenerateSawtoothWave(double frequency, double time, double volume = 1d)
{
var amplitude = 128 * volume;
var timeStep = 1d / SampleRate;
frequency /= 2;
var buffer = new byte[(int)(SampleRate * time)];
var ctime = 0d;
for (int i = 0; i < buffer.Length; i++)
{
//var x = ctime * frequency - Math.Floor(ctime * frequency + 0.5);
var x = GetSawtoothPoint(frequency, ctime);
buffer[i] = (byte)(amplitude * x);
ctime += timeStep;
}
return buffer;
}
public static byte[] GenerateNoiseWave(double time, double volume = 1d)
{
var amplitude = 128 * volume;
var timeStep = 1d / SampleRate;
var buffer = new byte[(int)(SampleRate * time)];
var ctime = 0d;
for (int i = 0; i < buffer.Length; i++)
{
buffer[i] = (byte)rng.Next(0, (int)amplitude);
ctime += timeStep;
}
return buffer;
return -(2 / Math.PI) * v;
}
public void Dispose()

14
Capy64/Runtime/Libraries/Audio.cs
View file

@ -3,6 +3,7 @@ using KeraLua;
using Microsoft.Xna.Framework.Audio;
using System;
using System.Threading.Tasks;
using static Capy64.Core.Audio;
namespace Capy64.Runtime.Libraries;
@ -144,6 +145,8 @@ public class Audio : IPlugin
var volume = L.OptNumber(3, 1);
volume = Math.Clamp(volume, 0, 1);
var timespan = TimeSpan.FromSeconds(time);
var form = L.CheckOption(4, "sine", new string[]
{
"sine",
@ -154,16 +157,7 @@ public class Audio : IPlugin
null,
});
var buffer = form switch
{
0 => Core.Audio.GenerateSineWave(freq, time, volume),
1 => Core.Audio.GenerateSquareWave(freq, time, volume),
2 => Core.Audio.GenerateTriangleWave(freq, time, volume),
3 => Core.Audio.GenerateSawtoothWave(freq, time, volume),
4 => Core.Audio.GenerateNoiseWave(time, volume),
_ => throw new NotImplementedException()
};
var buffer = _game.Audio.GenerateWave((Waveform)form, freq, timespan);
try
{