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