From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Hofman <pavel.hofman@ivitera.com>
Subject: Re: [PATCH v2] Add M2Tech hiFace USB-SPDIF driver
Date: Mon, 22 Apr 2013 10:37:23 +0200
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To: Pietro Cipriano <p.cipriano@m2tech.biz>
Cc: alsa-devel@alsa-project.org, Takashi Iwai <tiwai@suse.de>, Antonio Ospite <ao2@amarulasolutions.com>, Clemens Ladisch <clemens@ladisch.de>, Daniel Mack <zonque@gmail.com>, fchecconi@gmail.com, alberto@amarulasolutions.com, Michael Trimarchi <michael@amarulasolutions.com>
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On 22.4.2013 10:31, Pietro Cipriano wrote:
> Il 22/04/2013 09:40, Pavel Hofman ha scritto:
>>
>>
>> On 20.4.2013 22:15, Daniel Mack wrote:
>>> On 13.02.2013 18:11, Antonio Ospite wrote:
>>>> Add driver for M2Tech hiFace USB-SPDIF interface and compatible
>>>> devices.
>>>>
>>>> M2Tech hiFace and compatible devices offer a Hi-End S/PDIF Output
>>>> Interface, see http://www.m2tech.biz/hiface.html
>>>
>>> Just curious: is there a new version of this patch set coming?
>>
>> I have read users report large latencies (unable to watch movies) of
>> hiFace1 in OSX while reportedly they have not identified any major
>> latency in windows. Perhaps the fixed PCM_PACKET_SIZE
> The issue is related to a no controllable buffer dimension, which
> depends by Audio Core thus present only on OSx. A easy workaround is of
> to set up a higher output sampling frequency, for instance at 192KHz the
> delay is no more perceptible, obviously the DAC must be compliant with
> this setting.
> 
> Pietro

Thanks for very fast reponse. So is it possible to reduce the period
size in the linux driver? Right now if I calculate correctly it is 4096
bytes / 32bits / 2 channels / 48000 Hz = 10 ms.

Thanks,

Pavel.