79 lines
2.2 KiB
Go
79 lines
2.2 KiB
Go
package main
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import (
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"fmt"
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"math"
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"time"
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rl "git.terah.dev/UnrealXR/raylib-go/raylib"
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)
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const (
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nSamples = 44000 * 10
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sampleRate = 6000
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bufferSize = nSamples
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frequency = 440
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targetFPS = 240
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)
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func main() {
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rl.InitWindow(800, 450, "raylib [audio] example - raw audio streaming")
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position := rl.NewVector2(0, 0)
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rl.SetAudioStreamBufferSizeDefault(bufferSize)
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rl.InitAudioDevice()
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// Init raw audio stream (sample rate: <nSamples>, sample size: 32bit-float, channels: 1-mono)
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stream := rl.LoadAudioStream(nSamples, 32, 1)
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//// Create sine wave to play
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data := make([]float32, nSamples)
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for i := 0; i < nSamples; i++ {
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t := float32(i) / float32(nSamples)
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data[i] = float32(math.Sin(float64((2 * rl.Pi * frequency * t))))
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}
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// NOTE: The buffer can only be updated when it has been processed. Time between buffer processing and next load and causes clipping
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rl.PlayAudioStream(stream)
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startTime := time.Now()
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rl.SetTargetFPS(targetFPS)
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for !rl.WindowShouldClose() {
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// Refill audio stream if buffer is processed
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if rl.IsAudioStreamProcessed(stream) {
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elapsedTime := time.Since(startTime).Seconds()
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currentSampleIndex := int(math.Mod(elapsedTime*float64(sampleRate), float64(nSamples)))
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nextSampleIndex := currentSampleIndex + bufferSize
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if nextSampleIndex > nSamples {
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nextSampleIndex = bufferSize - (nSamples - currentSampleIndex)
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rl.UpdateAudioStream(stream, append(data[currentSampleIndex:], data[:nextSampleIndex]...))
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} else {
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rl.UpdateAudioStream(stream, data[currentSampleIndex:nextSampleIndex])
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}
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}
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rl.BeginDrawing()
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rl.ClearBackground(rl.RayWhite)
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rl.DrawText(fmt.Sprintf("%d Hz SINE WAVE SHOULD BE PLAYING!", frequency), 200, 140, 20, rl.LightGray)
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// NOTE: Draw a part of the sine wave (only screen width)
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for i := 0; i < int(rl.GetScreenWidth()); i++ {
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position.X = float32(i)
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position.Y = 250 + 10*data[i*nSamples/int(20*rl.GetScreenWidth())]
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rl.DrawPixelV(position, rl.Red)
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}
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rl.EndDrawing()
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}
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rl.UnloadAudioStream(stream) // Close raw audio stream and delete buffers from RAM
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rl.CloseAudioDevice() // Close audio device (music streaming is automatically stopped)
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rl.CloseWindow()
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}
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