core-audio

I need to play and record simultaneously using Core Audio. I really do not want to use AVFoundation API (AVAudioPlayer + AVAudioRecorder) to do this as I am making a music app and cannot have any latency issues. I've looked at the following source code from Apple: aurioTouch MixerHost I've already looked into the following posts: iOS: Sample code for simultaneous record and playback Record and play audio Simultaneously I am still not clear on how I can do playback and record the same thing simultaneously using Core Audio. Any pointers towards how I can achieve this will be greatly appreciable.

I'm creating a old school music emulator for the old GWBasic PLAY command. To that end I have a tone generator and a music player. Between each of the notes played I'm getting a chirp sound that mucking things up. Below are both of my classes: ToneGen.h #import <Foundation/Foundation.h> @interface ToneGen : NSObject @property (nonatomic) id delegate; @property (nonatomic) double frequency; @property (nonatomic) double sampleRate; @property (nonatomic) double theta; - (void)play:(float)ms; - (void)play; - (void)stop; @end ToneGen.m #import <AudioUnit/AudioUnit.h> #import "ToneGen.h" OSStatus

I'm looking for a way to tap into the current audio output on a Mac, then return a value representing the current sound level. By sound level, I mean the amount of noise being generated by the output. I'm NOT asking how to get the current volume level of the output device. the following code is pulled from Apple's Sample AVRecorder … this particular bit of code acquires a set of connections from this class's movieFileOutput's connections methods, gets the AVCaptureAudioChannel for each connection, and calculates decibel power based upon that. i would presume that if you are looking for an

I need my app to be notified when the OS X sound volume has changed. This is for a Desktop app, not for iOS. How can I register for this notification? This can be a tiny bit tricky because some audio devices support a master channel, but most don't so the volume will be a per-channel property. Depending on what you need to do you could observe only one channel and assume that all other channels the device supports have the same volume. Regardless of how many channels you want to watch, you observe the volume by registering a property listener for the AudioObject in question: // Some devices

I've got an OSX app that records audio data using an Audio Unit. The Audio Unit's input can be set to any available source with inputs, including the built-in input. The problem is, the audio that I get from the built-in input is often clipped, whereas in a program such as Audacity (or even Quicktime) I can turn down the input level and I don't get clipping. Multiplying the sample frames by a fraction, of course, doesn't work, because I get a lower volume, but the samples themselves are still clipped at time of input. How do I set the input level or gain for that built-in input to avoid the

i'm back with one more question related to BASS . I already had posted this question How Can we control bass of music in iPhone , but not get as much attention of your people as it should get. But now I have done some more search and had read the Core AUDIO . I got one sample code which i want to share with you people here is the link to download it iPhoneMixerEqGraphTest . Have a look on it in this code what i had seen is the developer had use preset Equalizer given by iPod in Apple. Lets see some code snippet too:---- // iPodEQ unit CAComponentDescription eq_desc(kAudioUnitType_Effect,

I'm really out of ideas so I'll have to ask you guys again... I'm building an iPhone application which uses three instances of AVPlayer. They all play at the same time and it's very important that they do so. I used to run this code: CMClockRef syncTime = CMClockGetHostTimeClock(); CMTime hostTime = CMClockGetTime(hostTime); [self.playerOne setRate:1.0f time:kCMTimeInvalid atHostTime:hostTime]; [self.playerTwo setRate:1.0f time:kCMTimeInvalid atHostTime:hostTime]; [self.playerThree setRate:1.0f time:kCMTimeInvalid atHostTime:hostTime]; which worked perfectly. But a few days ago it just stopped