Merge pull request #1510 from ninjamuffin99/pitch

Audio pitch change implementation

src/lime/_internal/backend/flash/FlashAudioSource.hx

@@ -117,6 +117,17 @@ class FlashAudioSource
 		return loops = value;
 	}
 
+	public function getPitch():Float
+	{
+		lime.utils.Log.verbose("Pitch is not supported in Flash.");
+		return 1;
+	}
+
+	public function setPitch(value:Float):Float
+	{
+		return getPitch();
+	}
+
 	public function getPosition():Vector4
 	{
 		position.x = channel.soundTransform.pan;

src/lime/_internal/backend/html5/HTML5AudioSource.hx

@@ -204,6 +204,25 @@ class HTML5AudioSource
 		return loops = value;
 	}
 
+	public function getPitch():Float
+	{
+		#if lime_howlerjs
+		return parent.buffer.__srcHowl.rate();
+		#else
+		return 1;
+		#end
+	}
+
+	public function setPitch(value:Float):Float
+	{
+		#if lime_howlerjs
+		parent.buffer.__srcHowl.rate(value);
+		#end
+		
+		return getPitch();
+	}
+	
+
 	public function getPosition():Vector4
 	{
 		#if lime_howlerjs

src/lime/_internal/backend/native/NativeAudioSource.hx

@@ -387,6 +387,12 @@ class NativeAudioSource
 
 	public function setCurrentTime(value:Int):Int
 	{
+		// `setCurrentTime()` has side effects and is never safe to skip.
+		/* if (value == getCurrentTime())
+		{
+			return value;
+		} */
+
 		if (handle != null)
 		{
 			if (stream)
@@ -425,7 +431,7 @@ class NativeAudioSource
 				timer.stop();
 			}
 
-			var timeRemaining = getLength() - value;
+			var timeRemaining = Std.int((getLength() - value) / getPitch());
 
 			if (timeRemaining > 0)
 			{
@@ -484,7 +490,7 @@ class NativeAudioSource
 				timer.stop();
 			}
 
-			var timeRemaining = value - getCurrentTime();
+			var timeRemaining = Std.int((value - getCurrentTime()) / getPitch());
 
 			if (timeRemaining > 0)
 			{
@@ -506,6 +512,44 @@ class NativeAudioSource
 		return loops = value;
 	}
 
+	public function getPitch():Float
+	{
+		if (handle != null)
+		{
+			return AL.getSourcef(handle, AL.PITCH);
+		}
+		else
+		{
+			return 1;
+		}
+	}
+
+	public function setPitch(value:Float):Float
+	{
+		if (playing && value != getPitch())
+		{
+			if (timer != null)
+			{
+				timer.stop();
+			}
+
+			var timeRemaining = Std.int((getLength() - getCurrentTime()) / value);
+
+			if (timeRemaining > 0)
+			{
+				timer = new Timer(timeRemaining);
+				timer.run = timer_onRun;
+			}
+		}
+
+		if (handle != null)
+		{
+			AL.sourcef(handle, AL.PITCH, value);
+		}
+
+		return value;
+	}
+
 	public function getPosition():Vector4
 	{
 		if (handle != null)

src/lime/media/AudioSource.hx

@@ -17,6 +17,7 @@ class AudioSource
 	public var gain(get, set):Float;
 	public var length(get, set):Int;
 	public var loops(get, set):Int;
+	public var pitch(get, set):Float;
 	public var offset:Int;
 	public var position(get, set):Vector4;
 
@@ -108,6 +109,16 @@ class AudioSource
 		return __backend.setLoops(value);
 	}
 
+	@:noCompletion private function get_pitch():Float
+	{
+		return __backend.getPitch();
+	}
+
+	@:noCompletion private function set_pitch(value:Float):Float
+	{
+		return __backend.setPitch(value);
+	}
+
 	@:noCompletion private function get_position():Vector4
 	{
 		return __backend.getPosition();