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Packages/com.unity.renderstreaming@3.1.0-exp.9/Samples~/Example/Receiver/AudioSpectrumView.cs

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+using System;
+using System.Collections.Generic;
+using Unity.Collections;
+using UnityEngine;
+using Object = UnityEngine.Object;
+
+namespace Unity.RenderStreaming.Samples
+{
+    class AudioSpectrumView : MonoBehaviour
+    {
+        [SerializeField] AudioSource target;
+        [SerializeField] LineRenderer line;
+        [SerializeField] Color[] lineColors;
+        [SerializeField] RectTransform rectTransform;
+        [SerializeField] float xRatio = 1f;
+        [SerializeField] float yRatio = 1f;
+
+        const int positionCount = 256;
+        float[] spectrum = new float[2048];
+        private AudioClip clip;
+
+        Vector3[] array;
+        List<LineRenderer> lines = new List<LineRenderer>();
+
+        private Dictionary<AudioSpeakerMode, int> SpeakerModeToChannel = new Dictionary<AudioSpeakerMode, int>()
+        {
+            {AudioSpeakerMode.Mono, 1},
+            {AudioSpeakerMode.Stereo, 2},
+            {AudioSpeakerMode.Quad, 4},
+            {AudioSpeakerMode.Surround, 5},
+            {AudioSpeakerMode.Mode5point1, 6},
+            {AudioSpeakerMode.Mode7point1, 8},
+        };
+
+        void Start()
+        {
+            array = new Vector3[positionCount];
+
+            // This line object is used as a template.
+            if (line.gameObject.activeInHierarchy)
+                line.gameObject.SetActive(false);
+
+            AudioSettings.OnAudioConfigurationChanged += OnAudioConfigurationChanged;
+        }
+
+        void OnAudioConfigurationChanged(bool deviceChanged)
+        {
+            // reset lines;
+            clip = null;
+        }
+
+        void ResetLines(int channelCount)
+        {
+            foreach (var line in lines)
+            {
+                Object.Destroy(line.gameObject);
+            }
+            lines.Clear();
+            for (int i = 0; i < channelCount; i++)
+            {
+                var line_ = GameObject.Instantiate(line, line.transform.parent);
+                line_.gameObject.SetActive(true);
+                line_.positionCount = positionCount;
+                line_.startColor = lineColors[i];
+                line_.endColor = lineColors[i];
+                lines.Add(line_);
+            }
+        }
+
+        void Update()
+        {
+            if (target.clip == null)
+            {
+                if (lines.Count > 0)
+                    ResetLines(0);
+                clip = null;
+                return;
+            }
+
+            if (clip != target.clip)
+            {
+                clip = target.clip;
+                int channelCount = clip.channels;
+                var conf = AudioSettings.GetConfiguration();
+                int maxChannelCount = SpeakerModeToChannel[conf.speakerMode];
+                channelCount = Math.Min(channelCount, maxChannelCount);
+                ResetLines(channelCount);
+            }
+            for (int lineIndex = 0; lineIndex < lines.Count; lineIndex++)
+            {
+                target.GetSpectrumData(spectrum, lineIndex, FFTWindow.Rectangular);
+                for (int i = 1; i < array.Length; i++)
+                {
+                    float x = rectTransform.rect.width * i / array.Length * xRatio;
+                    float y = rectTransform.rect.height * Mathf.Log(spectrum[i] + 1) * yRatio;
+                    array[i] = new Vector3(x, y, 0);
+                }
+                lines[lineIndex].SetPositions(array);
+            }
+        }
+    }
+}