81 lines
1.9 KiB
Go
81 lines
1.9 KiB
Go
package main
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import (
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"math"
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rl "github.com/gen2brain/raylib-go/raylib"
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)
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const (
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maxSamples = 22050
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maxSamplesPerUpdate = 4096
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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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rl.InitAudioDevice()
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// Init raw audio stream (sample rate: 22050, sample size: 32bit-float, channels: 1-mono)
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stream := rl.LoadAudioStream(22050, 32, 1)
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//// Fill audio stream with some samples (sine wave)
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data := make([]float32, maxSamples)
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for i := 0; i < maxSamples; i++ {
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data[i] = float32(math.Sin(float64((2*rl.Pi*float32(i))/2) * rl.Deg2rad))
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}
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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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rl.PlayAudioStream(stream)
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totalSamples := int32(maxSamples)
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samplesLeft := int32(totalSamples)
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position := rl.NewVector2(0, 0)
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rl.SetTargetFPS(30)
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for !rl.WindowShouldClose() {
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// Refill audio stream if required
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if rl.IsAudioStreamProcessed(stream) {
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numSamples := int32(0)
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if samplesLeft >= maxSamplesPerUpdate {
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numSamples = maxSamplesPerUpdate
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} else {
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numSamples = samplesLeft
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}
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rl.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 {
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samplesLeft = totalSamples
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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("SINE WAVE SHOULD BE PLAYING!", 240, 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 + 50*data[i]
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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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