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144 righe
5.2 KiB
144 righe
5.2 KiB
/*******************************************************************************************
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*
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* raylib [audio] example - Raw audio streaming
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*
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* NOTE: This example requires OpenAL Soft library installed
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*
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* This example has been created using raylib 1.6 (www.raylib.com)
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* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
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*
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* Copyright (c) 2015 Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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#include "raylib.h"
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#if defined(PLATFORM_WEB)
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#include <emscripten/emscripten.h>
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#endif
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#include <stdlib.h> // Required for: malloc(), free()
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#include <math.h> // Required for: sinf()
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#define MAX_SAMPLES 22050
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#define MAX_SAMPLES_PER_UPDATE 4096
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//----------------------------------------------------------------------------------
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// Global Variables Definition
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//----------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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AudioStream stream;
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short *data;
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int totalSamples = MAX_SAMPLES;
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int samplesLeft = MAX_SAMPLES;
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Vector2 position = { 0, 0 };
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//----------------------------------------------------------------------------------
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// Module Functions Declaration
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//----------------------------------------------------------------------------------
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void UpdateDrawFrame(void); // Update and Draw one frame
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//----------------------------------------------------------------------------------
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// Main Enry Point
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//----------------------------------------------------------------------------------
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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 - raw audio streaming");
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InitAudioDevice(); // Initialize audio device
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// Init raw audio stream (sample rate: 22050, sample size: 16bit-short, channels: 1-mono)
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stream = InitAudioStream(22050, 16, 1);
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// Generate samples data from sine wave
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data = (short *)malloc(sizeof(short)*MAX_SAMPLES);
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// TODO: Review data generation, it seems data is discontinued for loop,
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// for that reason, there is a clip everytime audio stream is looped...
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for (int i = 0; i < MAX_SAMPLES; i++)
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{
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data[i] = (short)(sinf(((2*PI*(float)i)/2)*DEG2RAD)*32000);
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}
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PlayAudioStream(stream); // Start processing stream buffer (no data loaded currently)
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#if defined(PLATFORM_WEB)
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emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
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#else
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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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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UpdateDrawFrame();
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}
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#endif
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// De-Initialization
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//--------------------------------------------------------------------------------------
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free(data); // Unload sine wave data
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CloseAudioStream(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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//----------------------------------------------------------------------------------
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// Module Functions Definition
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//----------------------------------------------------------------------------------
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void UpdateDrawFrame(void)
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{
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// Update
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//----------------------------------------------------------------------------------
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// Refill audio stream if required
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// NOTE: Every update we check if stream data has been already consumed and we update
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// buffer with new data from the generated samples, we upload data at a rate (MAX_SAMPLES_PER_UPDATE),
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// but notice that at some point we update < MAX_SAMPLES_PER_UPDATE data...
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if (IsAudioBufferProcessed(stream))
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{
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int numSamples = 0;
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if (samplesLeft >= MAX_SAMPLES_PER_UPDATE) numSamples = MAX_SAMPLES_PER_UPDATE;
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else numSamples = samplesLeft;
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UpdateAudioStream(stream, data + (totalSamples - samplesLeft), numSamples);
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samplesLeft -= numSamples;
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// Reset samples feeding (loop audio)
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if (samplesLeft <= 0) samplesLeft = totalSamples;
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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("SINE WAVE SHOULD BE PLAYING!", 240, 140, 20, LIGHTGRAY);
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// NOTE: Draw a part of the sine wave (only screen width, proportional values)
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for (int i = 0; i < GetScreenWidth(); i++)
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{
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position.x = i;
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position.y = 250 + 50*data[i]/32000;
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DrawPixelV(position, RED);
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}
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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