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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) 2014-2016 Ramon Santamaria (@raysan5)
--
-------------------------------------------------------------------------------------------
MAX_SAMPLES = 20000
DEG2RAD = math.pi/180.0
-- Initialization
-------------------------------------------------------------------------------------------
local screenWidth = 800
local screenHeight = 450
InitWindow(screenWidth, screenHeight, "raylib [audio] example - raw audio streaming")
InitAudioDevice() -- Initialize audio device
-- Init raw audio stream (sample rate: 22050, sample size: 32bit-float, channels: 1-mono)
local stream = InitAudioStream(22050, 32, 1)
-- Fill audio stream with some samples (sine wave)
local data = {}
for i = 1, MAX_SAMPLES do
data[i] = math.sin(((2*math.pi*i)/2)*DEG2RAD)
end
-- NOTE: The generated MAX_SAMPLES do not fit to close a perfect loop
-- for that reason, there is a clip everytime audio stream is looped
PlayAudioStream(stream)
local totalSamples = MAX_SAMPLES
local samplesLeft = totalSamples
local position = Vector2(0, 0)
SetTargetFPS(30) -- Set our game to run at 30 frames-per-second
-------------------------------------------------------------------------------------------
-- Main game loop
while not WindowShouldClose() do -- Detect window close button or ESC key
-- Update
---------------------------------------------------------------------------------------
-- Refill audio stream if required
if (IsAudioBufferProcessed(stream)) then
local numSamples = 0
if (samplesLeft >= 4096) then numSamples = 4096
else numSamples = samplesLeft end
UpdateAudioStream(stream, data + (totalSamples - samplesLeft), numSamples)
samplesLeft = samplesLeft - numSamples
-- Reset samples feeding (loop audio)
if (samplesLeft <= 0) then samplesLeft = totalSamples end
end
---------------------------------------------------------------------------------------
-- 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)
for i = 1, GetScreenWidth() do
position.x = (i - 1)
position.y = 250 + 50*data[i]
DrawPixelV(position, RED)
end
EndDrawing()
---------------------------------------------------------------------------------------
end
-- De-Initialization
-------------------------------------------------------------------------------------------
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
-------------------------------------------------------------------------------------------
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