AudioStream management functions.

examples/audio_stream_effects/main.lua

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+-- Based on raylib audio_stream_effects example
+
+package.path = package.path..";"..RL.GetBasePath().."../resources/lib/?.lua"
+package.cpath = package.cpath..";"..RL.GetBasePath().."../resources/clib/?.so"
+
+Vector2 = require( "vector2" )
+Rect = require( "rectangle" )
+
+-- NOTE! You have to compile the C lib containing the effects in resources/clib/audioProcess.c
+-- Implementing audio processors in Lua would probably be too slow.
+AudioProcess = require( "audioProcess" )
+
+local music = nil
+local rect = Rect:new()
+local rect2 = Rect:new()
+local effectLPF = nil
+local effectDelay = nil
+local enableEffectLPF = false
+local enableEffectDelay = false
+
+function RL.init()
+	RL.SetWindowTitle( "Audio stream effects" )
+	RL.SetWindowState( RL.FLAG_VSYNC_HINT )
+	RL.InitAudioDevice()
+
+	music = RL.LoadMusicStream( RL.GetBasePath().."../resources/music/Juhani Junkala [Retro Game Music Pack] Title Screen.ogg" )
+
+	RL.PlayMusicStream( music )
+
+	AudioProcess.init()
+	effectLPF = AudioProcess.AudioProcessEffectLPF()
+	effectDelay = AudioProcess.AudioProcessEffectDelay()
+
+	local winSize = Vector2:newT( RL.GetScreenSize() )
+	local barWidth = 256
+
+	rect:set(
+		winSize.x / 2 - barWidth / 2,
+		winSize.y / 2 - 5,
+		barWidth,
+		10
+	)
+	rect2:setR( rect )
+end
+
+function RL.update( delta )
+	RL.UpdateMusicStream( music )
+
+	-- Add/Remove effect: lowpass filter
+	if RL.IsKeyPressed( RL.KEY_F ) then
+		local stream = RL.GetMusicStream( music )
+		enableEffectLPF = not enableEffectLPF
+
+		if enableEffectLPF then
+			RL.AttachAudioStreamProcessor( stream, effectLPF )
+			-- RL.AttachAudioMixedProcessor( effectLPF )
+		else
+			RL.DetachAudioStreamProcessor( stream, effectLPF )
+			-- RL.DetachAudioMixedProcessor( effectLPF )
+		end
+	end
+
+	-- Add/Remove effect: delay
+	if RL.IsKeyPressed( RL.KEY_D ) then
+		local stream = RL.GetMusicStream( music )
+		enableEffectDelay = not enableEffectDelay
+
+		if enableEffectDelay then
+			RL.AttachAudioStreamProcessor( stream, effectDelay )
+			-- RL.AttachAudioMixedProcessor( effectDelay )
+		else
+			RL.DetachAudioStreamProcessor( stream, effectDelay )
+			-- RL.DetachAudioMixedProcessor( effectDelay )
+		end
+	end
+end
+
+function RL.draw()
+	local musicLen = RL.GetMusicTimeLength( music )
+	local musicPos = RL.GetMusicTimePlayed( music )
+
+	RL.ClearBackground( RL.RAYWHITE )
+
+	RL.DrawText(
+		"PRESS F TO TOGGLE LPF EFFECT "..( enableEffectLPF and "ON" or "OFF" ),
+		Vector2:temp( rect.x - 80, rect.y - 80 ), 20, RL.GRAY
+	)
+	RL.DrawText(
+		"PRESS D TO TOGGLE DELAY EFFECT "..( enableEffectDelay and "ON" or "OFF" ),
+		Vector2:temp( rect.x - 90, rect.y - 40 ), 20, RL.GRAY
+	)
+
+	RL.DrawRectangleLines( rect + Rect:temp( 0, -1, 1, 1 ), RL.BLACK )
+	rect2.width = musicPos / musicLen * rect.width
+	RL.DrawRectangle( rect2, RL.RED )
+end
+
+function RL.exit()
+	AudioProcess.free()
+end