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/*******************************************************************************************
*
* raylib [audio] example - raw stream
*
* Example complexity rating: [★★★☆] 3/4
*
* Example originally created with raylib 1.6, last time updated with raylib 6.0
*
* Example created by Ramon Santamaria (@raysan5) and reviewed by James Hofmann (@triplefox)
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2015-2026 Ramon Santamaria (@raysan5) and James Hofmann (@triplefox)
*
********************************************************************************************/
using System;
using System.Numerics;
using static Raylib_cs.Raylib;
namespace Examples.Audio;
public unsafe partial class RawStream : IExample
{
private const int screenWidth = 800;
private const int screenHeight = 450;
private const int BUFFER_SIZE = 4096;
private const int SAMPLE_RATE = 44100;
public string Name => "Audio / Raw Stream";
public string Title => "raylib [audio] example - raw stream";
public int TargetFps => 30;
private float[] buffer;
private AudioStream stream;
private float pan;
private int sineFrequency;
private int newSineFrequency;
private int sineIndex;
private double sineStartTime;
public void Init()
{
InitAudioDevice();
// Set the number of samples the stream will keep in memory at a time to BUFFER_SIZE
SetAudioStreamBufferSizeDefault(BUFFER_SIZE);
buffer = new float[BUFFER_SIZE];
// Init raw audio stream (sample rate: 44100, sample size: 32bit-float, channels: 1-mono)
stream = LoadAudioStream(SAMPLE_RATE, 32, 1);
pan = 0.0f;
SetAudioStreamPan(stream, pan);
PlayAudioStream(stream);
sineFrequency = 440;
newSineFrequency = 440;
sineIndex = 0;
sineStartTime = 0.0;
}
public void Update()
{
// Update
//----------------------------------------------------------------------------------
if (IsKeyDown(KeyboardKey.Up))
{
newSineFrequency += 10;
if (newSineFrequency > 12500) newSineFrequency = 12500;
}
if (IsKeyDown(KeyboardKey.Down))
{
newSineFrequency -= 10;
if (newSineFrequency < 20) newSineFrequency = 20;
}
if (IsKeyDown(KeyboardKey.Left))
{
pan -= 0.01f;
if (pan < -1.0f) pan = -1.0f;
SetAudioStreamPan(stream, pan);
}
if (IsKeyDown(KeyboardKey.Right))
{
pan += 0.01f;
if (pan > 1.0f) pan = 1.0f;
SetAudioStreamPan(stream, pan);
}
if (IsAudioStreamProcessed(stream))
{
for (int i = 0; i < BUFFER_SIZE; i++)
{
int wl = SAMPLE_RATE / sineFrequency;
buffer[i] = MathF.Sin(2 * MathF.PI * sineIndex / wl);
sineIndex++;
if (sineIndex >= wl)
{
sineFrequency = newSineFrequency;
sineIndex = 0;
sineStartTime = GetTime();
}
}
fixed (float* bufferPtr = buffer)
{
UpdateAudioStream(stream, bufferPtr, BUFFER_SIZE);
}
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(Color.RayWhite);
DrawText($"sine frequency: {sineFrequency}", screenWidth - 220, 10, 20, Color.Red);
DrawText($"pan: {pan:F2}", screenWidth - 220, 30, 20, Color.Red);
DrawText("Up/down to change frequency", 10, 10, 20, Color.DarkGray);
DrawText("Left/right to pan", 10, 30, 20, Color.DarkGray);
int windowStart = (int)((GetTime() - sineStartTime) * SAMPLE_RATE);
int windowSize = (int)(0.1f * SAMPLE_RATE);
int wavelength = SAMPLE_RATE / sineFrequency;
// Draw a sine wave with the same frequency as the one being sent to the audio stream
for (int i = 0; i < screenWidth; i++)
{
int t0 = windowStart + i * windowSize / screenWidth;
int t1 = windowStart + (i + 1) * windowSize / screenWidth;
Vector2 startPos = new Vector2(i, 250 + 50 * MathF.Sin(2 * MathF.PI * t0 / wavelength));
Vector2 endPos = new Vector2(i + 1, 250 + 50 * MathF.Sin(2 * MathF.PI * t1 / wavelength));
DrawLineV(startPos, endPos, Color.Red);
}
EndDrawing();
//----------------------------------------------------------------------------------
}
public void Unload()
{
UnloadAudioStream(stream); // Close raw audio stream and delete buffers from RAM
CloseAudioDevice(); // Close audio device (music streaming is automatically stopped)
}
public static int Main()
{
// Initialization
//--------------------------------------------------------------------------------------
InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw stream");
SetTargetFPS(30);
//--------------------------------------------------------------------------------------
var game = new RawStream();
game.Init();
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
game.Update();
}
game.Unload();
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
}