cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   pabloruiz55
   Member

   Hi! Is there a way to fade out/in the background music using CDSoundEngine? I meam, can i control the volume at least? Thanks!

   Posted 2 years ago #
2. 

   Tim
   Member

   Ok, if you promise not to laugh....but given my basic skills and not seeing any other way to handle it, here's what I did to fade in and out background music:

   for (i = 0; i < 300; i++) {
   audioVolume = audioVolume + 0.001f;
   [CDAudioManager sharedManager].backgroundMusic.volume = audioVolume;
   }

   It's a quick fade in but at least it takes off the edge versus just starting or stopping it.

   Posted 2 years ago #
3. 

   Steve Oldmeadow
   Administrator

   @pabloruiz - in CDSoundEngine the volume is called gain. You can control the volume of all sound effects with masterGain or set the gain of individual effects. If you want to dynamically modify the gain of an effect while it is playing then the best approach is to use a CDSourceWrapper - this is demonstrated in the CocosDenshionDemo but adjusting pitch, however, the approach is the same for gain.

   Eventually I plan to have some actions available for fades. I was hoping someone would write some generic property modifying actions and I could use those.

   @Tim - your method is okay but it is synchronous so it will impact the frame rate. For a short fade it is okay but imagine fading over 2 or 3 seconds - your application would lock up while the fade is happening.

   Posted 2 years ago #
4. 

   Tim
   Member

   Hey Steve,

   Yes, I just wanted something to eliminate the abruptness of starting and stopping the sound. I of course use the following to manipulate other in game sounds as you mentioned above:

   [[SimpleAudioEngine sharedEngine] playEffect:@"Slowjet.wav" pitch:1.0 pan:1.0 gain:0.7];

   Posted 2 years ago #
5. 

   whatupdave
   Member

   In my game I subclassed SimpleAudioEngine and added this:

   - (void)fadeBackgroundMusicFrom:(Float32)startVolume to:(Float32)endVolume duration:(ccTime)duration {
   	fadeTimeTaken = 0;
   	fadeDuration = duration;
   	fadeStartVolume = startVolume;
   	fadeEndVolume = endVolume;
   
   	[[CCScheduler sharedScheduler] scheduleUpdateForTarget:self priority:1 paused:NO];
   }
   
   - (void)update:(ccTime)delta {
   	fadeTimeTaken += delta;
   
   	CGFloat timeProportion = fadeTimeTaken / fadeDuration;
   	if (timeProportion < 1.0) {
   		CGFloat newMusicVolume = fadeStartVolume + (timeProportion * (fadeEndVolume - fadeStartVolume));
   		[self setBackgroundMusicVolume:newMusicVolume];
   	} else {
   		[[CCScheduler sharedScheduler] unscheduleUpdateForTarget:self];
   	}
   }

   Posted 1 year ago #
6. 

   Steve Oldmeadow
   Administrator

   ^ great but there is already functionality in CocosDenshion to fade background music and effects. It is demonstrated in the FadeToGrey demo.

   Since that original post cocos2d also now has a TweenAction that can be used to modify any numeric property so that could also be used.

   Posted 1 year ago #

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