Re: AudioBufferList configuration when rendering from AUHAL
Re: AudioBufferList configuration when rendering from AUHAL
- Subject: Re: AudioBufferList configuration when rendering from AUHAL
- From: Doug Wyatt <email@hidden>
- Date: Wed, 28 Feb 2018 20:29:44 -0800
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
# sent from my iPhone
> On Feb 28, 2018, at 15:48, Pierre Pasquet <email@hidden> 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)
> 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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