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148 lines
5.1 KiB
148 lines
5.1 KiB
/*******************************************************************************************
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*
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* raylib [audio] example - raw 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 1.6, last time updated with raylib 4.2
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*
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* Example created by Ramon Santamaria (@raysan5) and reviewed by James Hofmann (@triplefox)
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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) 2015-2025 Ramon Santamaria (@raysan5) and James Hofmann (@triplefox)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include <math.h>
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#define BUFFER_SIZE 4096
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#define SAMPLE_RATE 44100
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// This example sends a sine wave to the audio device
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int sineFrequency = 440;
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int newSineFrequency = 440;
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int sineIndex = 0;
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double sineStartTime = 0.0;
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void AudioStreamCallback(void *framesOut, unsigned int frameCount)
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{
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for (int i = 0; i < frameCount; i++)
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{
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int wavelength = SAMPLE_RATE/sineFrequency;
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((float *)framesOut)[i] = sin(2*PI*sineIndex/wavelength);
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sineIndex++;
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if (sineIndex >= wavelength)
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{
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sineFrequency = newSineFrequency;
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sineIndex = 0;
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sineStartTime = GetTime();
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}
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}
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}
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw stream callback");
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SetTargetFPS(30);
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InitAudioDevice();
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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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AudioStream stream = LoadAudioStream(SAMPLE_RATE, 32, 1);
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float pan = 0.0f;
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SetAudioStreamPan(stream, pan);
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PlayAudioStream(stream);
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// Configure it so AudioStreamCallback is called whenever stream is out of samples
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SetAudioStreamCallback(stream, AudioStreamCallback);
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//--------------------------------------------------------------------------------------
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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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// Update
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//----------------------------------------------------------------------------------
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if (IsKeyDown(KEY_UP))
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{
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newSineFrequency += 10;
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if (newSineFrequency > 12500) newSineFrequency = 12500;
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}
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if (IsKeyDown(KEY_DOWN))
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{
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newSineFrequency -= 10;
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if (newSineFrequency < 20) newSineFrequency = 20;
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}
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if (IsKeyDown(KEY_LEFT))
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{
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pan -= 0.01f;
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if (pan < -1.0f) pan = -1.0f;
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SetAudioStreamPan(stream, pan);
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}
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if (IsKeyDown(KEY_RIGHT))
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{
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pan += 0.01f;
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if (pan > 1.0f) pan = 1.0f;
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SetAudioStreamPan(stream, pan);
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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(RAYWHITE);
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DrawText(TextFormat("sine frequency: %i", sineFrequency), screenWidth - 220, 10, 20, RED);
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DrawText(TextFormat("pan: %.2f", pan), screenWidth - 220, 30, 20, RED);
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DrawText("Up/down to change frequency", 10, 10, 20, DARKGRAY);
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DrawText("Left/right to pan", 10, 30, 20, DARKGRAY);
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int windowStart = (GetTime() - sineStartTime)*SAMPLE_RATE;
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int windowSize = 0.1f*SAMPLE_RATE;
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int wavelength = SAMPLE_RATE/sineFrequency;
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// Draw a sine wave with the same frequency as the one being sent to the audio stream
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for (int i = 0; i < screenWidth; i++)
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{
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int t0 = windowStart + i*windowSize/screenWidth;
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int t1 = windowStart + (i + 1)*windowSize/screenWidth;
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Vector2 startPos = { i, 250 + 50*sin(2*PI*t0/wavelength) };
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Vector2 endPos = { i + 1, 250 + 50*sin(2*PI*t1/wavelength) };
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DrawLineV(startPos, endPos, RED);
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}
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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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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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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