Please don't use this library anymore. It was a good run, though. We had some laughs and it was easy for the iPhone to hear them.
This code has been deprecated in favor of Apple's built-in solution, available
since iOS 3.0:
Mobile Orchard published a nice tutorial.
A simple class for listening to microphone levels, suitable for the iPhone.
#import "SCListener.h" // Remember to link to AudioToolbox.framework. // Start listening. [[SCListener sharedListener] listen]; // Retrieve the average power. [[SCListener sharedListener] averagePower]; // Retrieve the peak power. [[SCListener sharedListener] peakPower]; // Hmm...we're using this guy a lot... SCListener *listener = [SCListener sharedListener]; // We can temporarily stop returning levels [listener pause]; [listener listen]; // Quick. // Or free up resources when we're not listening for awhile. [listener stop]; [listener listen]; // Slower. // Advanced!: // // If you're using the average and the peak, fetch both at once. if (![listener isListening]) // If listener has paused or stopped... return; // ...bail. AudioQueueLevelMeterState *levels = [listener levels]; Float32 peak = levels.mPeakPower; Float32 average = levels.mAveragePower;
(c) 2009-* Stephen Celis, email@example.com.
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