This document provides an overview of input, audio, and video playback in XNA game development. It discusses keyboard, mouse, and controller input methods in XNA. It also covers playing sound effects and background music using the SoundEffect and Song classes, as well as the more advanced XACT audio engine. The document concludes with instructions for loading and playing back video files in an XNA game.

1. Mohammad Shaker
mohammadshaker.com
@ZGTRShaker
2011, 2012, 2013, 2014
XNA Game Development
L06 – Input, Audio and Video Playback

2. Input
Keyboard, Mouse, Touch, Joystick, Sensors, etc.

3. Keyboard Input

4. Keyboard Input
• Why static?
KeyboardState state = Keyboard.GetState();

5. Keyboard Input
• Using Keyboard states
KeyboardState state = Keyboard.GetState();
if(state.IsKeyDown(Keys.Left))
{
// do something here
}

6. Keyboard Input
• Using Keyboard states
bool leftArrowKeyDown = state.IsKeyDown(Keys.Left);
if(state.IsKeyDown(Keys.Left))
{
// do something here
}

7. Keyboard Input
• Using Keyboard states
KeyboardState state = Keyboard.GetState();
if(state.IsKeyDown(Keys.Left))
{
// do something here
}

8. Keyboard Input
• Using Keyboard states
KeyboardState state = Keyboard.GetState();
if(state.IsKeyDown(Keys.Left))
{
// do something here
}

9. Keyboard Input - Checking for Key Presses
if(state.IsKeyDown(Keys.Left))
{
// do something here
}

10. Keyboard Input - Checking for Key Presses
if(state.IsKeyDown(Keys.Left))
{
// do something here
}

11. Keyboard Input - Checking for Key Presses
Keys[] pressedKeys = state.GetPressedKeys();

12. Keyboard Input - Key Modifiers
if(
(
state.IsKeyDown(Keys.LeftControl)|| state.IsKeyDown(Keys.RightControl)
)
&& state.IsKeyDown(Keys.C)
)
{
// Do something here when Ctrl-C is pressed
}

13. Mouse Input

14. Mouse Input - Showing the Mouse
this.IsMouseVisible = true;

15. Mouse Input - Mouse Input?
MouseState mouseState = Mouse.GetState();
if(mouseState.LeftButton == ButtonState.Pressed)
{
// Do whatever you want here
}

16. Mouse Input - Mouse Input?
• Mouse built-in methods
– LeftMouseButton
– MiddleMouseButton
– RightMouseButton
– XButton1
– XButton2
– X
– Y
– ScrollWheelValue

17. Mouse Input - Location
• Getting Location
int x = mouseState.X;
int y = mouseState.Y;
Mouse.SetPosition(xLocation, yLocation);
• Setting Location

18. Xbox(Or Other!) Controller Input

19. Controller Input

20. Controller Input
• GamePadState gamePadState = GamePad.GetState(PlayerIndex.One);
if(gamePadState.IsConnected)
{
// then it is connected, and we can do stuff here
}
if(gamePadState.Buttons.X == ButtonState.Pressed)
{
// do something
}

21. Controller Input
float maxSpeed = 0.1f;
float changeInAngle = gamePadState.Thumbsticks.Left.X * maxSpeed;
// this variable is defined elsewhere
angle += changeInAngle;

22. Controller Input – Vibration effect!

23. Controller Input – Vibration Cool effect!
GamePad.SetVibration(PlayerIndex.One, 1.0f, 1.0f);

24. Audio

25. Audio
• Audio in XNA
• Audio Suggestions for Games
• A Simple Way to Play Sound Effects in XNA
• A Simple Way to Play Background Music in XNA
• Using XACT
• Using XACT Projects in an XNA Game
• XACT Sound Loops
• 3D Audio Effects: Location
• 3D Audio Effects: Attenuation based on Distance

26. Audio in XNA
• The Concept

27. Audio Suggestions For Games
• Audio Suggestions For Games
– royalty free music in google.com
– http://www.incompetech.com/m/c/royalty-free/
– http://www.flashkit.com/
• Use sound in your game. It adds a lot to the game. Don't just ignore it. ( Not in
our uni :( )

28. Playing Sound Effects
• Adding Sound Effects to your Game
– Managing Content!

29. Playing Sound Effects
• WAV Audio File (.wav extension)
private SoundEffect effect;
effect = Content.Load<SoundEffect>("SoundFX/ExtraLife");

30. Playing Sound Effects
• WAV Audio File (.wav extension)
private SoundEffect effect;
effect = Content.Load<SoundEffect>("SoundFX/ExtraLife");
effect.Play();
float volume = 1.0f;
effect.Play(volume);
float volume = 1.0f;
float pitch = -1.0f;
float pan = -1.0f;
bool loop = true;
effect.Play(volume, pitch, pan, loop);

31. Playing Sound Effects
• SoundEffectInstances class
SoundEffectInstance effectInstance = effect1.Play();
effectInstance.Stop();

32. Playing Sound Effects
• SoundEffectInstances class
SoundEffectInstance effectInstance = effect1.Play();
effectInstance.Stop();

33. Playing Background Music
• Using the Song and MediaPlayer Classes to Play Audio
Song song = Content.Load<Song>("song_title");
// Put the name of your song here instead of "song_title"
MediaPlayer.Play(song);
MediaPlayer.IsRepeating = true;

34. Using XACT
• Cross-platform Audio Creation Tool
• The concept
• Using XACT
– Using XACT
– Using XACT Projects in an XNA Game
– XACT Sound Loops
– 3D Audio Effects: Location
– 3D Audio Effects: Attenuation based on Distance

35. Using XACT
• Small Tutorials
– http://rbwhitaker.wikidot.com/audio-tutorials
• http://rbwhitaker.wikidot.com/using-xact
• http://rbwhitaker.wikidot.com/playing-sound
• http://rbwhitaker.wikidot.com/xact-sound-loops
• http://rbwhitaker.wikidot.com/3d-audio-effects-location
– Books
• Microsoft Book
• Aaron Reed (O’Reilly)

36. Video Playback

37. Video Playback
• Loading the Video in XNA, Game1 Global Scope
Video video;
VideoPlayer player;

38. Video Playback
• Loading the Video in XNA, Game1 Global Scope
• LoadContent()
Video video;
VideoPlayer player;
video = Content.Load<Video>("AVideoToPlayback");
player = new VideoPlayer();

39. Video Playback
• Starting the Video
player.Play(video);

40. Video Playback
• Starting the Video
• Update()
player.Play(video);
if (player.State == MediaState.Stopped)
{
player.IsLooped = true;
player.Play(video);
}

41. Video Playback
• Looping
player.IsLooped = true;

42. Video Playback
• Drawing the Video, Draw()
Texture2D videoTexture = null;
if (player.State!= MediaState.Stopped)
videoTexture = player.GetTexture();

43. Video Playback
• Drawing the Video, Draw()
Texture2D videoTexture = null;
if (player.State!= MediaState.Stopped)
videoTexture = player.GetTexture();

44. Video Playback
• Drawing the Video, Draw()
Texture2D videoTexture = null;
if (player.State!= MediaState.Stopped)
videoTexture = player.GetTexture();

45. Video Playback
• Drawing the Video, Draw()
Texture2D videoTexture = null;
if (player.State!= MediaState.Stopped)
videoTexture = player.GetTexture();

46. Video Playback
• Drawing the Video, Draw()
Texture2D videoTexture = null;
if (player.State!= MediaState.Stopped)
videoTexture = player.GetTexture();
if (videoTexture!= null)
{
spriteBatch.Begin();
spriteBatch.Draw(videoTexture, new Rectangle(0, 0, 400, 300), Color.White);
spriteBatch.End();
}