Re: Coreaudio-api Digest, Vol 14, Issue 39
Re: Coreaudio-api Digest, Vol 14, Issue 39
- Subject: Re: Coreaudio-api Digest, Vol 14, Issue 39
- From: Gordon Rankin <email@hidden>
- Date: Tue, 4 Jul 2017 13:43:53 -0400
- Organization: Wavelength Audio, ltd.
- X_cmae_category: , ,
- X_cmae_category: , ,
Pawel,
What does the AD look like to the OS? What kinds of sample rates does it
look like? You may have to change the device to use DoP over PCM 24 bit
samples at 2X (i.e. 176.4 for DSD64 and 352.8 for DSD128....) because
the drivers may not understand the sample rates and so forth associated
with DSD.
Not a huge fan of DoP and I know companies are using DSD data direct at
32bit samples on output devices. But I think they are using standard PCM
sample rates.
Thanks,
Gordon
Today's Topics:
1. Integer mode for input stream (Paweł Gorgoń)
----------------------------------------------------------------------
Message: 1
Date: Mon, 3 Jul 2017 18:53:21 +0200
From: Paweł Gorgoń <email@hidden>
To: email@hidden
Subject: Integer mode for input stream
Message-ID: <email@hidden>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Hi Everyone,
I'am trying to make some recording application which will be using with
32bit/DSD ADC. It needs 32bit integer mode for input stream. I've done
some steps like enter hog mode, configure stream for unmixable 2-ch
int32 data (physical and virtual), register callback and start device,
but I receive data which are shifted randomly in every callback call.
I was make some more test and:
* the same configuration for output works properly.
* changing stream format to int via HALLab and recording using reaper
DAW causes same issue. Reaper interprets data as floats, but I have
constant patern generated in device which should be interpreted as
constant float value, but it doesn't.
* Receiving floats in my app gives constant values and it is ok.
* Data is shifted by 2, 4, 6 bytes for stereo device. For 4-channel
device it is multiple of 4bytes (4bytes, 8bytes ext.).
I've tested it on OSX 10.10.2 and OSX 10.11.6. Maybe someone has same
issue and can help me.
Thanks.
Pawel
--
J. Gordon Rankin
Owner and Chief Scientist
====== Wavelength Audio, ltd ======
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