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POWeird popping noise when playing different sounds with different volumes set through OpenAL on the iPhone
 

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  1. POWeird popping noise when playing different sounds with different volumes set through OpenAL on the iPhone
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    <p>I'm using OpenAL sound framework on the iPhone, and I'm setting different volumes on individual sounds. I'm running into a problem where I'm hearing an initial popping/clicking noise when switching from one sound to the next.</p> <p>It's really noticeable when I have one sound that's got a high volume (1.0) and a second sound that has a low one (0.2). When I hit the loud sound, and then hit the soft sound, I hear the pop/click. But when I go from the soft sound to the loud, I don't notice anything. So the pop/click really happens when switching from loud to soft sounds.</p> <p>Here's the init sound method:</p> <pre><code> - (id) initWithSoundFile:(NSString *)file doesLoop:(BOOL)loops { self = [super init]; if (self != nil) { if(![self loadSoundFile:file doesLoop:loops]) { debug(@"Failed to load the sound file: %@...", file); [self release]; return nil; } self.sourceFileName = file; //temporary sound queue self.temporarySounds = [NSMutableArray array]; //default volume/pitch self.volume = 1.0; self.pitch = 1.0; } return self; } </code></pre> <p>and here's the play function:</p> <pre><code>- (BOOL) play { if([self isPlaying]) //see if the base source is busy... { //if so, create a new source NSUInteger tmpSourceID; alGenSources(1, &amp;tmpSourceID); //attach the buffer to the source alSourcei(tmpSourceID, AL_BUFFER, bufferID); alSourcePlay(tmpSourceID); //add the sound id to the play queue so we can dispose of it later [temporarySounds addObject: [NSNumber numberWithUnsignedInteger:tmpSourceID]]; //a "callback" for when the sound is done playing +0.1 secs [self performSelector:@selector(deleteTemporarySource) withObject:nil afterDelay:(duration * pitch) + 0.1]; return ((error = alGetError()) != AL_NO_ERROR); } //if the base source isn't busy, just use that one... alSourcePlay(sourceID); return ((error = alGetError()) != AL_NO_ERROR); } </code></pre> <p>and here's the function where i set the volume for each sound immediately after playing (ive tried setting it before playing too):</p> <pre><code>- (void) setVolume:(ALfloat)newVolume { volume = MAX(MIN(newVolume, 1.0f), 0.0f); //cap to 0-1 alSourcef(sourceID, AL_GAIN, volume); //now set the volume for any temporary sounds... for(NSNumber *tmpSourceID in temporarySounds) { //tmpSourceID is the source ID for the temporary sound alSourcef([tmpSourceID unsignedIntegerValue], AL_GAIN, volume); } } </code></pre> <p>Any help is greatly appreciated as I've tried everything I can think of. I would be so grateful.</p>
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    1. COIt happens on Mac too. Have you found a solution ?
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      1. USRajavanya Subramaniyan
    2. CO@Quakeboy - No i haven't, i just gave up on it. Same problem with setting individual sounds' pitch.
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