Re: HAL Multichannel Recording - How to simultaneously write channels to separate files?
Re: HAL Multichannel Recording - How to simultaneously write channels to separate files?
- Subject: Re: HAL Multichannel Recording - How to simultaneously write channels to separate files?
- From: Graeme MacDonald <email@hidden>
- Date: Mon, 11 Oct 2010 04:03:25 -0500
Guess I just needed to keep exploring. I got it to work by setting kExtAudioFileProperty_ClientDataFormat
to the format from the input device (multichannel) and then in order to single out the desired channel
I applied a channel map to the ext file's built in audio converter.
I'm not sure if this is "the" way to do it, but it seems to do the trick. :)
On 2010-10-08, at 3:35 PM, Graeme MacDonald wrote:
> Hi, I am creating a multitrack recorder and I'm trying to figure out how to simultaneously record each device input/channel to it's own file. I have played around with Stream formats and Channel Layouts, but neither seem to address the process of providing access to each channel separately.
>
> In my HAL callback I currently have this simple method of writing the incoming data to a single file.
>
> AudioUnitRender(helper.halUnit,ioActionFlags,inTimeStamp, inBusNumber, inNumberFrames, helper.bufferList);
> OSStatus x = ExtAudioFileWriteAsync(mix.extRef, inNumberFrames, helper.bufferList);
>
> I can't see how to separate the channel data. Do I manually pull it out of the AudioBufferList? Maybe I need to run it through a splitter or convertor or something? Multiple HAL's? I'm a bit stumped and feeling like some insight could help a lot. I have tried searching the mailing list but the search function isn't working very well for me.
>
> Thanks.
> Graeme
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