I implemented OpenAL code to my iphone game. When I starts the game, it runs for 1 sec and stalls for 2 sec then resumes (hiccup effect). I believe its delayed due to the sound files loading. What is the solution? Can anyone recommend any book, site or sources code (not the iphone reference, please)? Is there a loading process and where should I initialize the loading process? Would that help?
Below, I have included the related components of the OpenAL code that I have implemented. The sound file will be played and invoked by a "if" statement in the gameloop. The OpenALController class is for the sound sources and buffers creation and the InitOpenAL method is invoked in OpenALController. MyView is a customized subclass of UIView and connected to the main view (I didn't use the default view).
// MyView.m // A customized UIView as the main view.
#import "OpenALSoundController.h"
- (void)startPlaying{
...
[self initializeValuables];
...
[self initializeTimer];
}
- (void)initializeTimer { if (theTimer == nil) {
theTimer = [CADisplayLink displayLinkWithTarget:self selector:@selector)gameLoop)];
theTimer.frameInterval = 2;
[theTimer addToRunLoop: [NSRunLoop currentRunLoop] forMode: NSDefaultRunLoopMode];
}
}
- (void)gameLoop { ... If something = true // Play the sound [[OpenALSoundController sharedSoundController] playSound1];
...
}
...
@end
// OpenALSoundController.h @interface OpenALSoundController : NSObject {
...}
...
+ (OpenALSoundController*) sharedSoundController
...
@end
// OpenALSoundController.m
// Singleton accessor
{
static OpenALSoundController* shared_sound_controller;
@synchronized(self)
{
if(nil == shared_sound_controller)
{ shared_sound_controller = [[OpenALSoundController alloc] init];
}
return shared_sound_controller;
}
return shared_sound_controller;
}
- (void) initOpenAL{
...
file_url = [[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:@"fire" ofType:@"wav"]];
firePcmData = MyGetOpenALAudioDataAll((CFURLRef)file_url, &data_size, &al_format,&sample_rate);
alBufferData(fireOutputBuffer, al_format, firePcmData, data_size, sample_rate);
[file_url release];
...
alSourcei(outputSourceFire, AL_BUFFER, fireOutputBuffer);
...
}
