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Questions tagged [extaudiofile]

32 questions
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ExtAudioFile - how to set meta data

I am writing audio content to a m4a file with ExtAudioFileWriteAsync and it is working perfectly. However, I would also like to add meta data to the exported file. Is this at all possible? If so, how? Any help would be much appreciated.
Lehel Medves
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How to get the bit rate of existing MP3 or AAC in iOS?

I want to display the bitrate of existing MP3 files and AAC files to the user, but I don't know how to correctly extract the bitrate of these files. So far, I've tried to get the AudioConverterRef pointer of the ExtAudioFileRef and then I wanted to…
Daniel S.
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ExtAudioFileConvert questions

I'm making some progress on taking a compressed (mp3) sound and saving it as PCM. In addition, I wanted to split the original file into chunks that are 2 seconds long, within the same process. I seem to be successful, but I am a little confused as…
mahboudz
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converting from AudioUnit format for ExtAudioFileWrite

I have a an AUGraph made of entirely of Apple AudioUnits - DLSSynth, Delay, Stereo Mixer. I am trying to capture the output of this into an ExtAudioFile. My issue is that I think I need to convert from the AudioUnit format to a file format that…
olynoise
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Using ExtAudioFileWrite to write at the end of a file

I'm trying to open a file and append data to it using ExtAudioFileWrite. Now, creating/initial writing(on creation)/converting works just fine, but unfortunately I can't seem to be able to open the file for writing afterwards. There is only one…
Rad'Val
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Massive memory spike when reading audio file

I am currently reading audio floats from a file using Dirac's (OSStatus) readFloatsConsecutive:(SInt64)numFrames intoArray:(float**)audio function. I create a pointer of float ** arrayToFill = malloc(channelCount * sizeof(float*)); for(int i = 0; i…
some_id
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ExtAudioFileWrite in iOS failing with error code -66560

I'm using ExtAudioFileWrite to write audio data into a file. But when it is interrupted by an alarm, although the file is saved, I get this error. What kind of error is this?
Namratha
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Proper way to declare ExtAudioFileRef in swift 5 for macOS

I have been working on an audio application where I can seek to a specific point in an ExtAudioFile and load a specific number of frames that represent a particular length (time) of playback into an AVAudioPCMBuffer and start playing it. If the…
SouthernYankee65
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AVAudioPlayer cannot play Audio (.wav) file written using ExtAudioFileWriteAsync

I used ExtAudioFileWriteAsync to write the recorded audio using RemoteIO into a .wav file. AVAudioPlayer is not playing the saved audio file. The audio file plays only on VLC media player but not in QuickTime or any other media players. var player =…
atik
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EXC_BAS_ACCESS in Core Audio - writing mic data to file w/ Extended AudioFile Services

I am attempting to write incoming mic audio to a file. Because the audio samples are delivered 4096 frames (the set frame rate for my project) at a time in a time-critical callback I cannot simply write the bytes to a file with AudioFileWriteBytes.…
Alexander Bollbach
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Comparing should-be identical AAC audio files - timestamp?

I have problems encoding AAC/M4A audio files on iPhone (iOS) and in simulator in a way so that mono/stereo and the track duration are recognized correctly by external players like VLC. For closing in on the problems on various devices, I have…
Daniel S.
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Does AVAudioFormat initStandardFormatWithSampleRate return incorrect stream description?

When trying to write a PCM audio file with ExtAudioFileCreateWithURL, I get an 'fmt?' err when using a 2-channel audio format (Mac OS X, SDK 10.10) I create the audio format with [[AVAudioFormat alloc] initStandardFormatWithSampleRate:sampleRate…
Zaggo
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Core Audio ExtAudioFile using Client Channel Layout

I’m trying to make use of ExtAudioFile's automatic channel layout mapping, but it doesn’t seem to work as I expected. Here’s what I do: I open a 6-Channel WAVE file with ExtAudioFileOpenURL() set the client data format property…
Sebastian
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Does the ExtAudioFile API ever use hardware to decode audio?

I am using the ExtAudioFile interface to decode audio, and would like to know whether it ever makes use of hardware-assisted audio decoding. The docs for the kExtAudioFileProperty_CodecManufacturer property say: Use this property in iOS to choose…
leremjs
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Error setting ClientDataFormat

I’m having some trouble encoding certain configurations of multi-channel Apple Lossless files. I have no problems with 2, 4 and 6 channel configurations, however I’m running into trouble generating a 12-channel file. Using the ExtAudioFile APIs, I’m…
Tim
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