mathe/Library/PackageCache/com.unity.timeline@1.7.5/Samples~/Customization/Video/VideoPlayableBehaviour.cs

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2024-09-20 20:30:10 +02:00
using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.Video;
namespace Timeline.Samples
{
// The runtime instance of a video clip player in Timeline.
public sealed class VideoPlayableBehaviour : PlayableBehaviour
{
public VideoPlayer videoPlayer;
public double preloadTime;
public double clipInTime;
public double startTime;
private bool preparing;
// Called by the mixer (VideoSchedulerPlayableBehaviour) when this is nearly active to
// give the video time to load.
public void PrepareVideo()
{
if (videoPlayer == null || videoPlayer.isPrepared || preparing)
return;
videoPlayer.targetCameraAlpha = 0.0f;
videoPlayer.time = clipInTime;
videoPlayer.Prepare();
preparing = true;
}
// Called each frame the clip is active.
//
public override void PrepareFrame(Playable playable, FrameData info)
{
if (videoPlayer == null)
return;
// Pause or Play the video to match whether the graph is being scrubbed or playing
// If we need to hold the last frame, this will treat the last frame as a pause
bool shouldBePlaying = info.evaluationType == FrameData.EvaluationType.Playback;
if (!videoPlayer.isLooping && playable.GetTime() >= videoPlayer.clip.length)
shouldBePlaying = false;
if (shouldBePlaying)
{
// this will use the timeline time to prevent drift
videoPlayer.timeReference = VideoTimeReference.ExternalTime;
if (!videoPlayer.isPlaying)
videoPlayer.Play();
videoPlayer.externalReferenceTime = playable.GetTime() / videoPlayer.playbackSpeed;
}
else
{
videoPlayer.timeReference = VideoTimeReference.Freerun;
if (!videoPlayer.isPaused)
videoPlayer.Pause();
SyncVideoToPlayable(playable);
}
// use the accumulated blend value to set the alpha and the audio volume
videoPlayer.targetCameraAlpha = info.effectiveWeight;
if (videoPlayer.audioOutputMode == VideoAudioOutputMode.Direct)
{
for (ushort i = 0; i < videoPlayer.clip.audioTrackCount; ++i)
videoPlayer.SetDirectAudioVolume(i, info.effectiveWeight);
}
}
// Called when the clip becomes active.
public override void OnBehaviourPlay(Playable playable, FrameData info)
{
if (videoPlayer == null)
return;
SyncVideoToPlayable(playable);
videoPlayer.playbackSpeed = Mathf.Clamp(info.effectiveSpeed, 1 / 10f, 10f);
videoPlayer.Play();
preparing = false;
}
// Called when the clip becomes inactive OR the timeline is 'paused'
public override void OnBehaviourPause(Playable playable, FrameData info)
{
if (videoPlayer == null)
return;
preparing = false;
// The effective weight will be greater than 0 if the graph is paused and the playhead is still on this clip.
if (info.effectiveWeight <= 0)
videoPlayer.Stop();
else
videoPlayer.Pause();
}
// Called when the playable is destroyed.
public override void OnPlayableDestroy(Playable playable)
{
if (videoPlayer != null)
{
videoPlayer.Stop();
if (Application.isPlaying)
Object.Destroy(videoPlayer.gameObject);
else
Object.DestroyImmediate(videoPlayer.gameObject);
}
}
// Syncs the video player time to playable time
private void SyncVideoToPlayable(Playable playable)
{
if (videoPlayer == null || videoPlayer.clip == null)
return;
if (videoPlayer.isLooping)
videoPlayer.time = playable.GetTime() % videoPlayer.clip.length;
else
videoPlayer.time = System.Math.Min(playable.GetTime(), videoPlayer.clip.length);
}
}
}