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Questions tagged [audiotoolbox]

The Audio Toolbox framework provides interfaces for recording, playback, and stream parsing. In iOS, the framework provides additional interfaces for managing audio sessions.

Audio Toolbox Framework Reference

366 questions
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Receiving kAUGraphErr_CannotDoInCurrentContext when calling AUGraphStart for playback

I'm working with AUGraph and Audio Units API to playback and record audio in my iOS app. Now I have a rare issue when an AUGraph is unable to start with the following error: result = kAUGraphErr_CannotDoInCurrentContext (-10863) The error occurred…
Mando
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Play musical notes in Swift Playground

I am trying to play a short musical note sequence with a default sine wave as sound inside a Swift Playground. At a later point I'd like to replace the sound with a Soundfont but at the moment I'd be happy with just producing some sound. I want…
Bernd
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Extract meter levels from audio file

I need to extract audio meter levels from a file so I can render the levels before playing the audio. I know AVAudioPlayer can get this information while playing the audio file through func averagePower(forChannel channelNumber: Int) -> Float. But…
Peter Warbo
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How to generate audio wave form programmatically while recording Voice in iOS?

How to generate audio wave form programmatically while recording Voice in iOS? m working on voice modulation audio frequency in iOS... everything is working fine ...just need some best simple way to generate audio wave form on detection…
iVenky
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Need to access the default camera shutter sound used by the iPhone

Right now when a user presses a button I play a custom camera shutter sound. However, if possible, I would much rather just use the camera shutter sound that plays by default whenever you take a photo using your iPhone. Is there a way that I can…
user3344977
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Using AudioToolbox from Swift to access OS X master volume

Is there a solution to setting the system's master volume from within my Swift app? I read a lot about AudioToolbox and read some source examples in Objective-C. For example, I found this: Setting Mac OS X Volume Programatically after 10.6 But I…
Peter Shaw
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Is there an event for when the headphones are unplugged?

During a test, a client noticed that video playback in the iPhone pauses when headphones are unplugged. He wanted similar functionality for audio playback, and maybe the ability to pop up a message. Does anyone know if there's an event of some kind…
Ben Clayton
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Why does AudioServicesCreateSystemSoundID throw an exception internally but return 0 as an error code?

I’m running an iOS program in the 4.3.2, 5.0, and 5.1 Simulators, and I’m hitting a weird internal exception in AudioToolbox. I have a breakpoint set in Xcode (Xcode 4.3.1, running on 10.7.3) for all exceptions, and the debugger is breaking during a…
cbowns
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Using AVFoundation / CoreMedia / Other Frameworks to Detect Beats / Onsets

(Preface: This is my first audio-related question on Stack Overflow, so I'll try to word this as best as I possibly can. Edits welcome.) I'm creating an application that'll allow users to loop music. At the moment our prototypes allow these "loop…
Bryan Veloso
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AudioServicesPlaySystemSound not playing sounds

I am playing a small .wav file using the AudioToolBox. AudioServicesPlaySystemSound (soundFileObject); But sometimes it is not playing. What is the reason?
Biranchi
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Swift - AVPlayer load failed with error Error Domain=NSURLErrorDomain Code=-999 "cancelled"

I try to play a video from url string. But I have get some error as question title. I try this code in below. videoPath is a url string. let videoURL = URL(string: videoPath) let player = AVPlayer(url: videoURL!) let…
Ali Ihsan URAL
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iOS Swift playing audio (aac) from network stream

I'm developing an iOS application and I'm quite new to iOS development. So far I have implemented a h264 decoder from network stream using VideoToolbox, which was quite hard. Now I need to play an audio stream that comes from network, but with no…
Jorge
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AudioFileWriteBytes (AudioToolbox) fails with error code -38 kAudioFileNotOpenError

I'm working on the app that records user audio, writes data to file using AudioToolbox and processes these data. In analytics I see A LOT of errors that happen in AudioToolbox recording. Almost half of them is -38 kAudioFileNotOpenError error…
derpoliuk
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Swift: Retrieve audio file marker list from url?

I just want to get a list of the markers in an audio file. I thought this would be an easy common task that wouldn't be too difficult. However, I can barely find any example code or documentation, so I ended up with this: private func getMarkers(_…
MysteryPancake
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What are the system sound ids for the new keyboard clicks in iOS 10?

General I'm developing a third party keyboard and am currently trying to mimic the new keyboard clicks that Apple introduced in iOS 10b4. Current SituationThe regular click sound can be played using AudioServicesPlaySystemSound(1104) but I can't…
cyril
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