core-audio

I am developing an iOS application (targetted specifically for iPhone, at the moment) that requires the application to record audio only from iPhone internal microphone (even when headphone/headset is plugged in), and playback at headphone (let's assumed headphone is plugged in for now). I am wondering if this is currently possible with the available APIs? If so, can anyone please shed some light on how do I go about doing this? Thanks! I believe the answer to this question to be 'no'. I used an iPhone 4 and the new-to-iOS 4 AVFoundation to experiment, focussing on the AVCaptureDevice class. I

I'm struggling to follow Apple's documentation regarding playing back a small .wav file using the AVAudioPlayer class. I'm also not sure what toolboxes I need for basic audio playback. So far I have imported: AVFoundation.framework CoreAudio.framework AudioToolbox.framework Here is my code .h and .m : #import <UIKit/UIKit.h> #import <AVFoundation/AVFoundation.h> @interface ViewController : UIViewController <AVAudioPlayerDelegate> - (IBAction)playAudio:(id)sender; @end #import "ViewController.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super

I want to implement a feature that lets the user trim an audio file (.caf) which he perviously recorded. The recording part already works, but how can i add a trimming feature similar to the one in the Voicememos app. Is there an api for the audio trimmer apple uses? Any help would be great... How about using the AVFoundation? Import the audio file into an AVAsset (composition etc), then you can export it - setting preferred time + duration - to a file. I wrote a stock function awhile ago that exports an asset to a file, you can also specify an audiomix. As below it exports all of the file,

How do I utilize AudioObjectGetPropertyData in OS X to retrieve a list of the system's input devices? I currently have the following dummy code for retrieving a global list of devices: AudioDeviceID devices[12]; UInt32 arraySize = sizeof(devices); AudioObjectPropertyAddress thePropertyAddress = { kAudioHardwarePropertyDevices, kAudioObjectPropertyScopeGlobal, kAudioObjectPropertyElementMaster }; AudioObjectGetPropertyData(kAudioObjectSystemObject, &thePropertyAddress, 0, NULL, &arraySize, &devices); To determine if a device is an input device you need to check and see if it has any input

What would be the best way to get Hz frequency value from audio stream(music) on iOS? What are the best and easiest frameworks provided by Apple to do that. Thanks in advance. Bjorn Roche Questions like this are asked a lot here on SO. (I've answered a similar one here ) so I wrote a little tutorial with code that you can use even in commercial and closed source apps. This is not necessarily the BEST way, but it's a way that many people understand. You will have to modify it based on what you mean by "Hz average value of every short music segment". Do you mean the fundamental pitch or the