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Questions tagged [audioqueueservices]

Audio Queue Services provides a straightforward, low overhead way to record and play audio in OS X. Starting with OS X v10.5, it is the recommended technology to use for adding basic recording or playback features to your Mac app.

Audio Queue Services Programming Guide

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Why might my AudioQueueOutputCallback not be called?

I'm using the Audio Queue Services API to play audio streamed from a server over a TCP socket connection on an iPhone. I can play the buffers that were filled from the socket connection, I just cannot seem to make my AudioQueue call my…
Matt Wilding
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How to check current time and duration in AudioQueue

How to get total time duration of music in audioQueue. I am using NSTimeInterval AQPlayer::getCurrentTime() { NSTimeInterval timeInterval = 0.0; AudioQueueTimelineRef timeLine; OSStatus status = AudioQueueCreateTimeline(mQueue,…
Chandan Shetty SP
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NSData or bytes from CMSampleBufferRef

Hello I need to send a CMSampleBufferRef over a network. The client then plays the CMSampleBufferRef via the Audio Queue Services. I have seen some examples on stack overflow, but most of them just send the buffer. But then some informations are…
jjuser19jj
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Save to buffer instead of file when recording aac with Audio Queue Services

My goal is to record audio in AAC format and send it over a network connection as a stream. I'm using Audio Queue Services and have based my code on the SpeakHere example. I know that for writing to a file it uses the AudioFileWritePackets()…
naturegirl
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Timing of Audio Queue Services and iPhone System Sounds

I am analyzing incoming audio on an iPhone/iPod Touch using the Audio Queue Services. The desired behavior of the analyzer boils down to this: when the App becomes active, start analyzing; when the App is sent to the background, stop analyzing. I am…
Andi Wagner
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Playback MP3 data buffer using AudioQueue Service : Prime failed (-50)

These days I was struggling for finding the way to playback network audio stream (in MP3 packet format) using AudioQueue Service on iPhone. To achieve this target successively, I firstly got the common local MP3 file to playback using AudioQueue,…
Xie Xingwei
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Does an audio queue callback function have to be a C style function? Or can it be an objective C style method?

Does an audio queue callback function have to be a C style function? Or can it be an objective C style method?
Darren Findlay
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AudioQueueStart is returning error code -50

Start audio recording giving error sometimes and below method returns error Error Domain=NSOSStatusErrorDomain Code=-50 "(null)" UserInfo= status = AudioQueueStart(_state.queue, NULL); Followed below steps for recording audo - Created a…
Sudhakar Tharigoppula
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Audio Queue Services recording to .mp4 file, that cannot be play. And Magic Cookie issue

I am a newbie Mac programmer just for 3 months. I got a Audio Queue Services problem, hope anyone can help me. I using Audio Queue Services API created a recording program, and output AAC format data. It's seems good, everything work fine. Until I…
Ryan Liang
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Audio Queue Services Player in Swift isn't calling callback

I've been playing around with Audio Queue Services for about a week and I've written a swift version of from the Apple Audio Queue Services Guide. I'm recording in Linear PCM and saving to disk with this method: AudioFileCreateWithURL(url,…
aBikis
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Core Audio on iPhone - any way to change the microphone gain (either for speakerphone mic or headphone mic)?

After much searching the answer seems to be no, but I thought I'd ask here before giving up. For a project I'm working on that includes recording sound, the input levels sound a little quiet both when the route is external mic + speaker and when…
Halle
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How to start writing out an existing AudioQueue in response to an event?

I am writing a class that opens an AudioQueue and analyzes its characteristics, and then under certain conditions can begin or end writing out a file from that AudioQueue that is already instantiated. This is my code (entirely based on SpeakHere)…
Halle
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How do I get the filesystem path for a resource on iPhone?

On the iPhone I need to get the path for the resource. OK, done that, but when it comes to CFURLCreateFromFileSystemRepresentation thing, I just don't know how to solve this. Why does this error occur? Any solution or workaround would be highly…
Karl
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Do I need to deal with Audio Units when I need custom audio effects or can I rely on Audio Queue Services?

From my understanding Audio Queue Services are a higher level API than Audio Units, which use Audio Units. OpenAL also uses Audio Units. So Audio Units is the lowest level audio API in iOS. I need to record a sound and then apply a custom filter to…
Proud Member
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Audio Queue Services callback: AudioStreamPacketDescription cannot be copied?

I am creating a simple iOS app that records audio with a circular buffer. This means that it continually records audio, but only keeps the last 15 buffers in memory. I do this by copying all the data I get from the AudioInputCallback: void…
Peterdk
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