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Assets/AVProVideo/Runtime/Scripts/Components/MediaPlayer_TimeScale.cs

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+using UnityEngine;
+
+//-----------------------------------------------------------------------------
+// Copyright 2015-2022 RenderHeads Ltd.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace RenderHeads.Media.AVProVideo
+{
+	public partial class MediaPlayer : MonoBehaviour
+	{
+
+#region Support for Time Scale
+#if AVPROVIDEO_BETA_SUPPORT_TIMESCALE
+		// Adjust this value to get faster performance but may drop frames.
+		// Wait longer to ensure there is enough time for frames to process
+		private const float TimeScaleTimeoutMs = 20f;
+		private bool _timeScaleIsControlling;
+		private double _timeScaleVideoTime;
+
+		private void UpdateTimeScale()
+		{
+			if (Time.timeScale != 1f || Time.captureFramerate != 0)
+			{
+				if (_controlInterface.IsPlaying())
+				{
+					_controlInterface.Pause();
+					_timeScaleIsControlling = true;
+					_timeScaleVideoTime = _controlInterface.GetCurrentTime();
+				}
+
+				if (_timeScaleIsControlling)
+				{
+					// Progress time
+					_timeScaleVideoTime += Time.deltaTime;
+
+					// Handle looping
+					if (_controlInterface.IsLooping() && _timeScaleVideoTime >= Info.GetDuration())
+					{
+						// TODO: really we should seek to (_timeScaleVideoTime % Info.GetDuration())
+						_timeScaleVideoTime = 0.0;
+					}
+
+					int preSeekFrameCount = TextureProducer.GetTextureFrameCount();
+
+					// Seek to the new time
+					{
+						double preSeekTime = Control.GetCurrentTime();
+
+						// Seek
+						_controlInterface.Seek(_timeScaleVideoTime);
+
+						// Early out, if after the seek the time hasn't changed, the seek was probably too small to go to the next frame.
+						// TODO: This behaviour may be different on other platforms (not Windows) and needs more testing.
+						if (Mathf.Approximately((float)preSeekTime, (float)_controlInterface.GetCurrentTime()))
+						{
+							return;
+						}
+					}
+
+					// Wait for the new frame to arrive
+					if (!_controlInterface.WaitForNextFrame(GetDummyCamera(), preSeekFrameCount))
+					{
+						// If WaitForNextFrame fails (e.g. in android single threaded), we run the below code to asynchronously wait for the frame
+						System.DateTime startTime = System.DateTime.Now;
+						int lastFrameCount = TextureProducer.GetTextureFrameCount();
+
+						while (_controlInterface != null && (System.DateTime.Now - startTime).TotalMilliseconds < (double)TimeScaleTimeoutMs)
+						{
+							_playerInterface.Update();
+							_playerInterface.Render();
+							GetDummyCamera().Render();
+							if (lastFrameCount != TextureProducer.GetTextureFrameCount())
+							{
+								break;
+							}
+						}
+					}
+				}
+			}
+			else
+			{
+				// Restore playback when timeScale becomes 1
+				if (_timeScaleIsControlling)
+				{
+					_controlInterface.Play();
+					_timeScaleIsControlling = false;
+				}
+			}
+		}
+#endif
+#endregion // Support for Time Scale
+	}
+}