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+/*******************************************************************************************
+*
+* raylib [audio] example - Mixed audio processing
+*
+* Example originally created with raylib 4.2, last time updated with raylib 4.2
+*
+* Example contributed by hkc (@hatkidchan) and reviewed by Ramon Santamaria (@raysan5)
+*
+* 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) 2023 hkc (@hatkidchan)
+*
+********************************************************************************************/
+#include "raylib.h"
+#include <math.h>
+
+static float exponent = 1.0f; // Audio exponentiation value
+static float averageVolume[400] = { 0.0f }; // Average volume history
+
+//------------------------------------------------------------------------------------
+// Audio processing function
+//------------------------------------------------------------------------------------
+void ProcessAudio(void *buffer, unsigned int frames)
+{
+ float *samples = (float *)buffer; // Samples internally stored as <float>s
+ float average = 0.0f; // Temporary average volume
+
+ for (unsigned int frame = 0; frame < frames; frame++)
+ {
+ float *left = &samples[frame * 2 + 0], *right = &samples[frame * 2 + 1];
+
+ *left = powf(fabsf(*left), exponent) * ( (*left < 0.0f)? -1.0f : 1.0f );
+ *right = powf(fabsf(*right), exponent) * ( (*right < 0.0f)? -1.0f : 1.0f );
+
+ average += fabsf(*left) / frames; // accumulating average volume
+ average += fabsf(*right) / frames;
+ }
+
+ // Moving history to the left
+ for (int i = 0; i < 399; i++) averageVolume[i] = averageVolume[i + 1];
+
+ averageVolume[399] = average; // Adding last average value
+}
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+ // Initialization
+ //--------------------------------------------------------------------------------------
+ const int screenWidth = 800;
+ const int screenHeight = 450;
+
+ InitWindow(screenWidth, screenHeight, "raylib [audio] example - processing mixed output");
+
+ InitAudioDevice(); // Initialize audio device
+
+ AttachAudioMixedProcessor(ProcessAudio);
+
+ Music music = LoadMusicStream("resources/country.mp3");
+ Sound sound = LoadSound("resources/coin.wav");
+
+ PlayMusicStream(music);
+
+ SetTargetFPS(60); // Set our game to run at 60 frames-per-second
+ //--------------------------------------------------------------------------------------
+
+ // Main game loop
+ while (!WindowShouldClose()) // Detect window close button or ESC key
+ {
+ // Update
+ //----------------------------------------------------------------------------------
+ UpdateMusicStream(music); // Update music buffer with new stream data
+
+ // Modify processing variables
+ //----------------------------------------------------------------------------------
+ if (IsKeyPressed(KEY_LEFT)) exponent -= 0.05f;
+ if (IsKeyPressed(KEY_RIGHT)) exponent += 0.05f;
+
+ if (exponent <= 0.5f) exponent = 0.5f;
+ if (exponent >= 3.0f) exponent = 3.0f;
+
+ if (IsKeyPressed(KEY_SPACE)) PlaySound(sound);
+
+ // Draw
+ //----------------------------------------------------------------------------------
+ BeginDrawing();
+
+ ClearBackground(RAYWHITE);
+
+ DrawText("MUSIC SHOULD BE PLAYING!", 255, 150, 20, LIGHTGRAY);
+
+ DrawText(TextFormat("EXPONENT = %.2f", exponent), 215, 180, 20, LIGHTGRAY);
+
+ DrawRectangle(199, 199, 402, 34, LIGHTGRAY);
+ for (int i = 0; i < 400; i++)
+ {
+ DrawLine(201 + i, 232 - (int)(averageVolume[i] * 32), 201 + i, 232, MAROON);
+ }
+ DrawRectangleLines(199, 199, 402, 34, GRAY);
+
+ DrawText("PRESS SPACE TO PLAY OTHER SOUND", 200, 250, 20, LIGHTGRAY);
+ DrawText("USE LEFT AND RIGHT ARROWS TO ALTER DISTORTION", 140, 280, 20, LIGHTGRAY);
+
+ EndDrawing();
+ //----------------------------------------------------------------------------------
+ }
+
+ // De-Initialization
+ //--------------------------------------------------------------------------------------
+ UnloadMusicStream(music); // Unload music stream buffers from RAM
+
+ DetachAudioMixedProcessor(ProcessAudio); // Disconnect audio processor
+
+ CloseAudioDevice(); // Close audio device (music streaming is automatically stopped)
+
+ CloseWindow(); // Close window and OpenGL context
+ //--------------------------------------------------------------------------------------
+
+ return 0;
+}