update

Packages/app.rive.rive-unity/Runtime/Components/Public/Audio/AudioProvider.cs

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+using Rive.Utils;
+using UnityEngine;
+
+namespace Rive.Components
+{
+    /// <summary>
+    /// Provides audio playback functionality for Rive Widgets. 
+    /// This component is not supported in WebGL builds; on that platform, system audio is used instead of routing through Unity's AudioSource.
+    /// </summary>
+    [RequireComponent(typeof(AudioSource))]
+    public class AudioProvider : MonoBehaviour
+    {
+        private AudioEngine m_audioEngine;
+        private AudioSource m_audioSource;
+        private bool m_isDestroyed = false;
+
+
+        /// <summary>
+        /// The Rive Audio Engine instance used by this AudioProvider.
+        /// </summary>
+        internal AudioEngine AudioEngine
+        {
+            get
+            {
+                if (m_audioEngine == null && !m_isDestroyed)
+                {
+                    m_audioEngine = InitEngine();
+                }
+                return m_audioEngine;
+            }
+        }
+
+        /// <summary>
+        /// The AudioSource component used for audio playback.
+        /// </summary>
+        public AudioSource AudioSource
+        {
+            get
+            {
+                return m_audioSource;
+            }
+        }
+
+
+        private void Awake()
+        {
+            LogWebGLWarningIfNeeded();
+            m_audioSource = GetComponent<AudioSource>();
+
+            if (m_audioSource == null)
+            {
+                DebugLogger.Instance.LogError($"AudioProvider component is missing an AudioSource component on the same game object.");
+                return;
+            }
+
+            // On iOS and Android, audio doesn't start automatically unless we call manually Play() here.
+            // It works fine in the Unity Editor and standalone PC/Mac builds without this, though. 
+            // For consistency, we call Play() here always until we find a better solution.
+            if (!m_audioSource.isPlaying)
+            {
+                m_audioSource.Play();
+            }
+        }
+
+
+        void OnAudioFilterRead(float[] data, int channels)
+        {
+            if (m_audioEngine == null)
+            {
+                return;
+            }
+            m_audioEngine.Sum(data, channels);
+
+        }
+
+        private AudioEngine InitEngine()
+        {
+            int channelCount = 1;
+            switch (AudioSettings.speakerMode)
+            {
+                case AudioSpeakerMode.Mono:
+                    channelCount = 1;
+                    break;
+                case AudioSpeakerMode.Stereo:
+                    channelCount = 2;
+                    break;
+                case AudioSpeakerMode.Quad:
+                    channelCount = 4;
+                    break;
+                case AudioSpeakerMode.Surround:
+                    channelCount = 5;
+                    break;
+                case AudioSpeakerMode.Mode5point1:
+                    channelCount = 6;
+                    break;
+                case AudioSpeakerMode.Mode7point1:
+                    channelCount = 8;
+                    break;
+                case AudioSpeakerMode.Prologic:
+                    channelCount = 2;
+                    break;
+            }
+
+            return Rive.AudioEngine.Make(channelCount, AudioSettings.outputSampleRate);
+        }
+
+        private void LogWebGLWarningIfNeeded()
+        {
+#if UNITY_WEBGL && !UNITY_EDITOR
+            DebugLogger.Instance.LogWarning($"The {nameof(AudioProvider)} component is not supported in WebGL builds. System audio will be used instead of routing audio through Unity's AudioSource.");
+#endif
+        }
+
+
+        private void OnDestroy()
+        {
+            m_isDestroyed = true;
+        }
+    }
+}

Packages/app.rive.rive-unity/Runtime/Components/Public/Audio/AudioProvider.cs.meta

@@ -0,0 +1,18 @@
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