step

examples/audio/raw_stream/main.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"math"
+
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+const (
+	maxSamples          = 22050
+	maxSamplesPerUpdate = 4096
+)
+
+func main() {
+	rl.InitWindow(800, 450, "raylib [audio] example - raw audio streaming")
+
+	rl.InitAudioDevice()
+
+	// Init raw audio stream (sample rate: 22050, sample size: 32bit-float, channels: 1-mono)
+	stream := rl.LoadAudioStream(22050, 32, 1)
+
+	//// Fill audio stream with some samples (sine wave)
+	data := make([]float32, maxSamples)
+
+	for i := 0; i < maxSamples; i++ {
+		data[i] = float32(math.Sin(float64((2*rl.Pi*float32(i))/2) * rl.Deg2rad))
+	}
+
+	// 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
+	rl.PlayAudioStream(stream)
+
+	totalSamples := int32(maxSamples)
+	samplesLeft := int32(totalSamples)
+
+	position := rl.NewVector2(0, 0)
+
+	rl.SetTargetFPS(30)
+
+	for !rl.WindowShouldClose() {
+		// Refill audio stream if required
+		if rl.IsAudioStreamProcessed(stream) {
+			numSamples := int32(0)
+			if samplesLeft >= maxSamplesPerUpdate {
+				numSamples = maxSamplesPerUpdate
+			} else {
+				numSamples = samplesLeft
+			}
+
+			rl.UpdateAudioStream(stream, data[totalSamples-samplesLeft:], numSamples)
+
+			samplesLeft -= numSamples
+
+			// Reset samples feeding (loop audio)
+			if samplesLeft <= 0 {
+				samplesLeft = totalSamples
+			}
+		}
+
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+		rl.DrawText("SINE WAVE SHOULD BE PLAYING!", 240, 140, 20, rl.LightGray)
+
+		// NOTE: Draw a part of the sine wave (only screen width)
+		for i := 0; i < int(rl.GetScreenWidth()); i++ {
+			position.X = float32(i)
+			position.Y = 250 + 50*data[i]
+
+			rl.DrawPixelV(position, rl.Red)
+		}
+
+		rl.EndDrawing()
+	}
+
+	rl.UnloadAudioStream(stream) // Close raw audio stream and delete buffers from RAM
+
+	rl.CloseAudioDevice() // Close audio device (music streaming is automatically stopped)
+
+	rl.CloseWindow()
+}