4 Mar
2005
4 Mar
'05
7:10 a.m.
On Mon, Feb 28, 2005 at 08:21:19PM +0000, Dave Chapman wrote:
Hopefully this is within the scope of this list but
following a lot of
recent googling, there doesn't appear to be any interest in
"open-sourcing" anything related to DVD-Audio.
As you may know, commercially authored DVD-Audio disks have three very
unfriendly features - encryption, watermarking and Meridian Lossless
Packing (MLP). I am assuming that these are some of the reasons
developers have not become interested in DVD-Audio.
Probably very true. It also seems quite difficult to obtain solid
technical info about it.
However, none of those features are compulsory, and if
you remove those
obstacles (which I am not interested in overcoming - simply avoiding),
you are left with a standard which allows 18 combinations of samplerate
and sample wordsize for 2-channel stereo audio (including 16-bit/44.1KHz
RedBook, and going all the way up to 24-bit/192KHz), plus a range of
6-channel uncompressed surround sound formats.
My aim is to produce a set of GPL'd tools to both author, "un-author",
and play such unencrypted, uncompressed disks, and am curious to know if
any other developers have an interest in this area or not.
I would certainly be very interested as a user. As a developer I have
no experience at all with things such as cdrecord or cdrdao, so apart
from some knowledge on how people would want to use DVD-A for things
like Ambisonics, I'd probably have little to contribute. BTW, a script
based interface such for cdrdao would be fine for me, don't waste your
time with a GUI (others will do that anyway :-).
I should reiterate that I'm not interested in
investigating features
such as encryption or MLP - I simply wish to be able to author my own
unencrypted and uncompressed DVD-Audio disks using my own music, which I
can then play back either on my hardware DVD-Audio player or on my PC,
all using free software
The only limitation of not using MLP would be that you can't have six
channels at 24/96.
BTW, do you know the exact status of MLP ? Is patented and do we know
how it works, or is it a 'trade secret' ?
--
FA