use streamed audio for freeplay previews

Author: KoloInDaCrib

source/funkin/audio/FunkinSound.hx

@@ -19,6 +19,9 @@ import openfl.events.Event;
 import openfl.media.Sound;
 import openfl.media.SoundChannel;
 import openfl.media.SoundMixer;
+#if lime_vorbis
+import lime.media.vorbis.VorbisFile;
+#end
 
 /**
  * A FlxSound which adds additional functionality:
@@ -342,8 +345,48 @@ class FunkinSound extends FlxSound implements ICloneable<FunkinSound>
 
     if (shouldLoadPartial)
     {
-      var music = FunkinSound.loadPartial(pathToUse, params.partialParams?.start ?? 0.0, params.partialParams?.end ?? 1.0, params?.startingVolume ?? 1.0,
-        params.loop ?? true, false, false, params.onComplete);
+      var start:Float = params.partialParams?.start ?? 0.0;
+      var end:Float = params.partialParams?.end ?? 1.0;
+
+      // If partial, attempt to load from vorbis first.
+      #if lime_vorbis
+      var vorbisSound:Null<Sound> = null;
+
+      var cacheFormat:String = '$pathToUse.partial-$start-$end';
+      if (Assets.cache.hasSound(cacheFormat)) vorbisSound = Assets.cache.getSound(cacheFormat);
+
+      if (vorbisSound == null)
+      {
+        var vorbisFile:Null<VorbisFile> = VorbisFile.fromFile(Paths.stripLibrary(pathToUse));
+        if (vorbisFile != null)
+        {
+          vorbisSound = Sound.fromAudioBuffer(lime.media.AudioBuffer.fromVorbisFile(vorbisFile));
+          Assets.cache.setSound(cacheFormat, vorbisSound);
+        }
+      }
+
+      if (vorbisSound != null)
+      {
+        var sound:Null<FunkinSound> = FunkinSound.load(vorbisSound, params?.startingVolume ?? 1.0, params.loop ?? true, false, true, false, params.onComplete);
+        if (sound != null)
+        {
+          sound._label = pathToUse;
+
+          FlxG.sound.music = sound;
+          FlxG.sound.list.remove(FlxG.sound.music);
+
+          // Apply the partial limits for the sound.
+          sound.loopTime = sound.length * start;
+          sound.endTime = sound.length * end;
+
+          if (FlxG.sound.music != null && params.onLoad != null) params.onLoad();
+
+          return true;
+        }
+      }
+      #end
+
+      var music = FunkinSound.loadPartial(pathToUse, start, end, params?.startingVolume ?? 1.0, params.loop ?? true, false, false, params.onComplete);
 
       if (music != null)
       {

source/funkin/ui/freeplay/FreeplayState.hx

@@ -3038,13 +3038,16 @@ class FreeplayState extends MusicBeatSubState
           onLoad: function() {
             FlxG.sound.music.fadeIn(2, 0, previewVolume);
 
-            var fadeStart:Float = (FlxG.sound.music.length / 1000) - 2;
+            var musicLength:Float = FlxG.sound.music.length;
+            if (FlxG.sound.music.endTime != null) musicLength = (FlxG.sound.music.endTime - FlxG.sound.music.loopTime);
+
+            var fadeStart:Float = (musicLength / 1000) - 2;
 
             previewTimers.push(new FlxTimer().start(fadeStart, function(_) {
               FlxG.sound.music.fadeOut(2, 0);
             }));
 
-            previewTimers.push(new FlxTimer().start(FlxG.sound.music.length / 1000, function(_) {
+            previewTimers.push(new FlxTimer().start(musicLength / 1000, function(_) {
               playCurSongPreview();
             }));
           },