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/*******************************************************************************************
*
* raylib [audio] example - Raw audio streaming
*
* NOTE: This example requires OpenAL Soft library installed
*
* This example has been created using raylib 1.6 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Copyright (c) 2015 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#if defined(PLATFORM_WEB)
#include <emscripten/emscripten.h>
#endif
#include <stdlib.h> // Required for: malloc(), free()
#include <math.h> // Required for: sinf()
#include <string.h> // Required for: memcpy()
#define MAX_SAMPLES 512
#define MAX_SAMPLES_PER_UPDATE 4096
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
AudioStream stream;
short *data;
short *writeBuf;
int totalSamples = MAX_SAMPLES;
int samplesLeft = MAX_SAMPLES;
Vector2 position = { 0, 0 };
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void); // Update and Draw one frame
//----------------------------------------------------------------------------------
// Main Enry Point
//----------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw audio streaming");
InitAudioDevice(); // Initialize audio device
// Init raw audio stream (sample rate: 22050, sample size: 16bit-short, channels: 1-mono)
stream = InitAudioStream(22050, 16, 1);
// Buffer for the single cycle waveform we are synthesizing
data = (short *)malloc(sizeof(short)*MAX_SAMPLES);
// Frame buffer, describing the waveform when repeated over the course of a frame
writeBuf = (short *)malloc(sizeof(short)*MAX_SAMPLES_PER_UPDATE);
PlayAudioStream(stream); // Start processing stream buffer (no data loaded currently)
#if defined(PLATFORM_WEB)
emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
#else
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
UpdateDrawFrame();
}
#endif
// De-Initialization
//--------------------------------------------------------------------------------------
free(data); // Unload sine wave data
free(writeBuf); // Unload write buffer
CloseAudioStream(stream); // Close raw audio stream and delete buffers from RAM
CloseAudioDevice(); // Close audio device (music streaming is automatically stopped)
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void)
{
// Update
//----------------------------------------------------------------------------------
// Refill audio stream if required
// NOTE: Every update we check if stream data has been already consumed and we update
// buffer with new data from the generated samples, we upload data at a rate (MAX_SAMPLES_PER_UPDATE),
// but notice that at some point we update < MAX_SAMPLES_PER_UPDATE data...
if (IsAudioBufferProcessed(stream))
{
int numSamples = 0;
if (samplesLeft >= MAX_SAMPLES_PER_UPDATE) numSamples = MAX_SAMPLES_PER_UPDATE;
else numSamples = samplesLeft;
UpdateAudioStream(stream, data + (totalSamples - samplesLeft), numSamples);
samplesLeft -= numSamples;
// Reset samples feeding (loop audio)
if (samplesLeft <= 0) samplesLeft = totalSamples;
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
DrawText("SINE WAVE SHOULD BE PLAYING!", 240, 140, 20, LIGHTGRAY);
// NOTE: Draw a part of the sine wave (only screen width, proportional values)
for (int i = 0; i < GetScreenWidth(); i++)
{
position.x = i;
position.y = 250 + 50*data[i]/32000;
DrawPixelV(position, RED);
}
EndDrawing();
//----------------------------------------------------------------------------------
}
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