Audio

1. Yu Feng CGDD 4903 Audio

2. Review 1. Set up 2. IOS sound • Core Audio • Short Sound • Long Sound • Control Sound • Background Sound 3.Cocos2d sound

3. Set up

4. Core Audio High level • System Sound API– short sounds • AVAudioPlayer (AVFoundation)– Long sounds Lower level • Audio Toolbox – recording and playback, streaming, full control • Audio Units – processing audio • OpenAL – 3D positional sound

5. Short Sounds • Less than 5 seconds • No looping • No volume control • Immediate playback • Limited set of formats (wav)

6. Short Sound Code Two process: 1. register the sound and get a ID 2. play the sound Using AduioToolkit

7. Long Sound • Play longer sounds (> 5 seconds) • Locally stored files or in-memory • Can loop, seek, play, pause • Provides metering • Play multiple sounds simultaneously • Supports many more formats

8. Long Sound Code [player play];

9. Simple Ways to Control Audio 1. Move Forward and Backward • Use Button • Use Slider

10. 2.Change Volume

11. 3.Play, Pause and Reset

12. 4.Interruption

13. Background Music

14. Add Audio in Cocos2d Audio Library: • CocosDenshion Three ways to import audio: • SimpleAudioEngine • CDSoundEngine • CDAudioManager

15. SimpleAudioEngine How it works: • Add header -- “SimpleAudioEngine.h” and “CocosDenshion.h” • Add sound file into support file • Code:

16. Different method playEffect: play a sound, play once • handle sound effect: • stopEffect • playEffect • preloadEffect • unloadEffect playBackgroundMusic: user can set loop times (.numberOfLoops=2) • handle background music: • pauseBackgroundMusic • resumeBackgroundMusic • rewindBackgroundMusic • preloadBackgroundMusic