How can I implement a volume meter for a song currently playing? (iPhone OS 3.1.3)
- by Adam
Hi i'm very new to core audio and I just would like some help in coding up a little volume meter for whatever's being outputted through headphones or built-in speaker. Like a dB meter. I have the following code, and have been trying to go through the apple source project "SpeakHere", but it's a nightmare trying to go through all that, without knowing how it works first... Could anyone shed some light?
Here's the code I have so far...
(void)displayWaveForm
{
while (musicIsPlaying == YES {
NSLog(@"%f",sizeof(AudioQueueLevelMeterState));
}
}
(IBAction)playMusic
{
if (musicIsPlaying == NO) {
NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/track7.wav",[[NSBundle mainBundle] resourcePath]]];
NSError *error;
music = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
music.numberOfLoops = -1;
music.volume = 0.5;
[music play];
musicIsPlaying = YES;
[self displayWaveForm];
}
else {
[music pause];
musicIsPlaying = NO;
}
}
