Re: OT: seeking simple digital interface which can pass AC-3 _input_
Re: OT: seeking simple digital interface which can pass AC-3 _input_
- Subject: Re: OT: seeking simple digital interface which can pass AC-3 _input_
- From: Jeff Moore <email@hidden>
- Date: Thu, 30 Aug 2007 11:51:43 -0700
When you are testing the data you are capturing, have you checked for
endianness? Some devices will bring the data in little endian, some
will bring it in big-endian. It should be indicated by the format
flags in the ASBD for the SPDIF stream.
On Aug 30, 2007, at 11:41 AM, Stephen Davis wrote:
Does anyone here have any recommendations for a simple s/pdif
digital interface (USB or FW) that can accept a digital bitstream as
input and *not* mess up the data? I have a MotU Traveler which I
love but it specifically states that it will not pass AC-3/DTS data
properly and I'm fine with that so I picked up an M-Audio Transit
USB in the hopes that it would but it doesn't either. The sync
header and some of the data make it through but liba52 gets CRC
errors on every packet. I've verified that the same code works on a
MacBook Pro with its built-in optical in. Maybe the Transit USB
*should* work but I need to configure the device differently???
I've searched around but have yet to find anyone specifically
claiming that digital bitstream input will work properly on their
device. The built-in optical ins on the Macs all work but this is
for an old PPC mini that doesn't have one.
Apologies for the off-topic post but figured some of the folks here
probably know...
--
Jeff Moore
Core Audio
Apple
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