Pierre, Rather than try to put AUHAL into AAC format, I would just use ExtAudioFile. Set it up so that the ExtAudioFile takes PCM as input, and AAC as the file format. It will handle the conversion for you. You can specify .caf or any other format that legally holds AAC. I believe that ExtAudioFile handles the threading issues.
AUHAL is designed to talk to the hardware, so it’s not really going to support all file formats. In contrast, ExtAudioFile is designed to handle most file formats (and you can even add your own via plugins). Of course, Doug’s suggestion may be even easier. Brian On Feb 28, 2018, at 8:29 PM, Doug Wyatt <dwy...@apple.com> wrote: > AUHAL does not support non-PCM formats. There are other higher-level API’s to > accomplish what it sounds like you’re trying to do, e.g. AVAudioRecorder and > AVAudioEngine with an AVAudioFile. > > Doug > > On Feb 28, 2018, at 15:48, Pierre Pasquet <pierrep...@icloud.com > <mailto:pierrep...@icloud.com>> wrote: >> Hi All, >> >> I have posted a question on stack overflow >> (https://stackoverflow.com/questions/49038140/audiobufferlist-for-auhal-unit-whose-output-stream-format-is-compressed >> >> <https://stackoverflow.com/questions/49038140/audiobufferlist-for-auhal-unit-whose-output-stream-format-is-compressed>) >> but since CoreAudio isn’t that popular I thought it would be worth it to >> ask it here as well. >> >> To make it short (even if it’s not that easy in this case), I’d like to >> record audio from an input device using au AUHAL, encode it into AAC format >> and write to a file (.caf at the moment). So the input scope of the AUHAL >> reads data in LPCM and output scope should render AAC (everything in bus 1). >> >> However, I have an error when rendering (AudioUnitRender returns -50). I >> really don’t know what I’m doing wrong. My audio stream is in stereo so I >> allocate two AudioBuffer but it doesn’t seem to work. >> >> Anyway, everything is explained in more detail in the stack overflow >> question. Would be great if you could have a look at it and answer me either >> here or on the post to give a better visibility. >> >> Thanks ! >> Best, >> Pierre
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