chore: clean recommit
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122 changed files with 23950 additions and 323 deletions
306
Examples/Audio/StreamCallback.cs
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306
Examples/Audio/StreamCallback.cs
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/*******************************************************************************************
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*
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* raylib [audio] example - stream callback
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*
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* Example complexity rating: [★★★☆] 3/4
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*
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* Example originally created with raylib 6.0, last time updated with raylib 6.0
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*
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* Example created by Dan Hoang (@dan-hoang) and reviewed by Ramon Santamaria (@raysan5)
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*
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* NOTE: Example sends a wave to the audio device,
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* user gets the choice of four waves: sine, square, triangle, and sawtooth
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* A stream is set up to play to the audio device; stream is hooked to a callback that
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* generates a wave, that is determined by user choice
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2026 Dan Hoang (@dan-hoang)
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*
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********************************************************************************************/
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using System;
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using System.Numerics;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using static Raylib_cs.Raylib;
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namespace Examples.Audio;
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[ExcludeFromBrowser("SetAudioStreamCallback is unreliable on the wasm audio backend")]
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public unsafe partial class StreamCallback : IExample
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{
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private const int screenWidth = 800;
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private const int screenHeight = 450;
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private const int BUFFER_SIZE = 4096;
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private const int SAMPLE_RATE = 44100;
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// Wave type
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private enum WaveType
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{
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Sine,
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Square,
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Triangle,
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Sawtooth
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}
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public string Name => "Audio / Stream Callback";
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public string Title => "raylib [audio] example - stream callback";
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public int TargetFps => 30;
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private static int waveFrequency = 440;
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private static int newWaveFrequency = 440;
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private static int waveIndex = 0;
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// Buffer to keep the last second of uploaded audio,
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// part of which will be drawn on the screen
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private static readonly float[] buffer = new float[SAMPLE_RATE];
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private static readonly string[] waveTypesAsString = { "sine", "square", "triangle", "sawtooth" };
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private AudioStream stream;
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private WaveType waveType;
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public void Init()
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{
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InitAudioDevice();
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waveFrequency = 440;
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newWaveFrequency = 440;
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waveIndex = 0;
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Array.Clear(buffer, 0, buffer.Length);
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// Set the number of samples the stream will keep in memory at a time to BUFFER_SIZE
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SetAudioStreamBufferSizeDefault(BUFFER_SIZE);
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// Init raw audio stream (sample rate: 44100, sample size: 32bit-float, channels: 1-mono)
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stream = LoadAudioStream(SAMPLE_RATE, 32, 1);
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PlayAudioStream(stream);
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// Configure it so that the callback for waveType is called whenever stream is out of samples
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waveType = WaveType.Sine;
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SetWaveCallback();
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}
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// Attach the callback matching the current waveType to the stream
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private void SetWaveCallback()
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{
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switch (waveType)
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{
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case WaveType.Sine: SetAudioStreamCallback(stream, &SineCallback); break;
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case WaveType.Square: SetAudioStreamCallback(stream, &SquareCallback); break;
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case WaveType.Triangle: SetAudioStreamCallback(stream, &TriangleCallback); break;
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case WaveType.Sawtooth: SetAudioStreamCallback(stream, &SawtoothCallback); break;
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}
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}
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public void Update()
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{
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// Update
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//----------------------------------------------------------------------------------
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if (IsKeyDown(KeyboardKey.Up))
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{
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newWaveFrequency += 10;
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if (newWaveFrequency > 12500) newWaveFrequency = 12500;
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}
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if (IsKeyDown(KeyboardKey.Down))
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{
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newWaveFrequency -= 10;
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if (newWaveFrequency < 20) newWaveFrequency = 20;
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}
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if (IsKeyPressed(KeyboardKey.Left))
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{
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if (waveType == WaveType.Sine) waveType = WaveType.Sawtooth;
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else if (waveType == WaveType.Square) waveType = WaveType.Sine;
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else if (waveType == WaveType.Triangle) waveType = WaveType.Square;
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else waveType = WaveType.Triangle;
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SetWaveCallback();
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}
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if (IsKeyPressed(KeyboardKey.Right))
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{
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if (waveType == WaveType.Sine) waveType = WaveType.Square;
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else if (waveType == WaveType.Square) waveType = WaveType.Triangle;
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else if (waveType == WaveType.Triangle) waveType = WaveType.Sawtooth;
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else waveType = WaveType.Sine;
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SetWaveCallback();
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}
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(Color.RayWhite);
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DrawText($"frequency: {newWaveFrequency}", screenWidth - 220, 10, 20, Color.Red);
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DrawText($"wave type: {waveTypesAsString[(int)waveType]}", screenWidth - 220, 30, 20, Color.Red);
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DrawText("Up/down to change frequency", 10, 10, 20, Color.DarkGray);
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DrawText("Left/right to change wave type", 10, 30, 20, Color.DarkGray);
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// Draw the last 10 ms of uploaded audio
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for (int i = 0; i < screenWidth; i++)
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{
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Vector2 startPos = new Vector2(i, 250 - 50 * buffer[WaveSampleIndex(i)]);
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Vector2 endPos = new Vector2(i + 1, 250 - 50 * buffer[WaveSampleIndex(i + 1)]);
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DrawLineV(startPos, endPos, Color.Red);
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}
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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public void Unload()
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{
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UnloadAudioStream(stream); // Close raw audio stream and delete buffers from RAM
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CloseAudioDevice(); // Close audio device (music streaming is automatically stopped)
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}
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// Maps a screen column to a sample index in the last 10 ms of the buffer. The final column
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// maps one sample past the end of the buffer; upstream C reads out of bounds there, so we
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// clamp to the last valid sample (visually identical, but safe under C# bounds checking).
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private static int WaveSampleIndex(int column)
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{
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int index = SAMPLE_RATE - SAMPLE_RATE / 100 + column * SAMPLE_RATE / 100 / screenWidth;
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return index < SAMPLE_RATE ? index : SAMPLE_RATE - 1;
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}
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//------------------------------------------------------------------------------------
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// Module Functions Definition
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//------------------------------------------------------------------------------------
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[UnmanagedCallersOnly(CallConvs = new[] { typeof(CallConvCdecl) })]
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private static void SineCallback(void* framesOut, uint frameCount)
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{
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int fc = (int)frameCount;
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int wavelength = SAMPLE_RATE / waveFrequency;
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float* frames = (float*)framesOut;
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// Synthesize the sine wave
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for (int i = 0; i < fc; i++)
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{
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frames[i] = MathF.Sin(2 * MathF.PI * waveIndex / wavelength);
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waveIndex++;
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if (waveIndex >= wavelength)
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{
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waveFrequency = newWaveFrequency;
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waveIndex = 0;
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}
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}
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// Save the synthesized samples for later drawing
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for (int i = 0; i < SAMPLE_RATE - fc; i++) buffer[i] = buffer[i + fc];
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for (int i = 0; i < fc; i++) buffer[SAMPLE_RATE - fc + i] = frames[i];
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}
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[UnmanagedCallersOnly(CallConvs = new[] { typeof(CallConvCdecl) })]
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private static void SquareCallback(void* framesOut, uint frameCount)
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{
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int fc = (int)frameCount;
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int wavelength = SAMPLE_RATE / waveFrequency;
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float* frames = (float*)framesOut;
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// Synthesize the square wave
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for (int i = 0; i < fc; i++)
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{
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frames[i] = (waveIndex < wavelength / 2) ? 1 : -1;
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waveIndex++;
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if (waveIndex >= wavelength)
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{
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waveFrequency = newWaveFrequency;
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waveIndex = 0;
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}
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}
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// Save the synthesized samples for later drawing
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for (int i = 0; i < SAMPLE_RATE - fc; i++) buffer[i] = buffer[i + fc];
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for (int i = 0; i < fc; i++) buffer[SAMPLE_RATE - fc + i] = frames[i];
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}
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[UnmanagedCallersOnly(CallConvs = new[] { typeof(CallConvCdecl) })]
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private static void TriangleCallback(void* framesOut, uint frameCount)
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{
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int fc = (int)frameCount;
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int wavelength = SAMPLE_RATE / waveFrequency;
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float* frames = (float*)framesOut;
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// Synthesize the triangle wave
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for (int i = 0; i < fc; i++)
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{
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frames[i] = (waveIndex < wavelength / 2) ? (-1 + 2.0f * waveIndex / (wavelength / 2)) : (1 - 2.0f * (waveIndex - wavelength / 2) / (wavelength / 2));
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waveIndex++;
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if (waveIndex >= wavelength)
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{
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waveFrequency = newWaveFrequency;
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waveIndex = 0;
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}
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}
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// Save the synthesized samples for later drawing
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for (int i = 0; i < SAMPLE_RATE - fc; i++) buffer[i] = buffer[i + fc];
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for (int i = 0; i < fc; i++) buffer[SAMPLE_RATE - fc + i] = frames[i];
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}
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[UnmanagedCallersOnly(CallConvs = new[] { typeof(CallConvCdecl) })]
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private static void SawtoothCallback(void* framesOut, uint frameCount)
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{
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int fc = (int)frameCount;
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int wavelength = SAMPLE_RATE / waveFrequency;
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float* frames = (float*)framesOut;
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// Synthesize the sawtooth wave
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for (int i = 0; i < fc; i++)
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{
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frames[i] = -1 + 2.0f * waveIndex / wavelength;
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waveIndex++;
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if (waveIndex >= wavelength)
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{
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waveFrequency = newWaveFrequency;
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waveIndex = 0;
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}
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}
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// Save the synthesized samples for later drawing
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for (int i = 0; i < SAMPLE_RATE - fc; i++) buffer[i] = buffer[i + fc];
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for (int i = 0; i < fc; i++) buffer[SAMPLE_RATE - fc + i] = frames[i];
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}
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public static int Main()
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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InitWindow(screenWidth, screenHeight, "raylib [audio] example - stream callback");
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SetTargetFPS(30);
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//--------------------------------------------------------------------------------------
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var game = new StreamCallback();
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game.Init();
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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game.Update();
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}
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game.Unload();
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// De-Initialization
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//--------------------------------------------------------------------------------------
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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}
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