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Support for Sony Atrac .oma files codec ?

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Ysl:
Hi

First of all thank you to all involved in this great project !!!

I would like to know if there will be a possibility to listen to all those .oma files I recorded from vinyl to my Minidisc recorder.

I use Rockbox on my Iaudio X5 and would be even more happy if there was a atrac codec !

Thanks again

Ysl

TexasRockbox:
I notice in the later builds (r22761, for example) there is an atrac3_rm.codec.  I think this was implemented a few weeks ago.  I do not know if it will work for your files.

There have been various flavors of ATRAC over the years, ATRAC 1, LP/SP, ATRAC 3+.  I do not know if the codec makes any distinction and it all seems to be backward compatible.

saratoga:

--- Quote from: Ysl on October 02, 2009, 05:07:45 PM ---I would like to know if there will be a possibility to listen to all those .oma files I recorded from vinyl to my Minidisc recorder.

--- End quote ---

According to Google, OMA files are encrypted and so are not playable in devices that do not support Sony's DRM format, and so cannot be used in rockbox (nor can you discuss removing that DRM as per our forum rules).

This thread has some info:

http://forum.dbpoweramp.com/showthread.php?t=7532

Your best bet is to see if the Sony software will let you remove the DRM, or failing that to rerecord them into a less restrictive format.

Ysl:
Thanks for your reply

As already mentioned, the recorded tracks came from vinyl records, I do not think they is any DRM in them.
Proof that there are no DRM is that I can easily convert those .oma files to mp3/flac/ogg etc with Himd Renderer (http://marcnetsystem.co.uk/) but I would like to avoid the re-compression which cause lost of quality.

Where can I find more info about the Atrac codec in the latest builds. The decoding of Atrac files in rockbox doesn't seem to very well documented..(?)

Thanks again

Ysl

saratoga:

--- Quote from: Ysl on October 04, 2009, 09:58:51 AM ---Proof that there are no DRM is that I can easily convert those .oma files to mp3/flac/ogg etc with Himd Renderer (http://marcnetsystem.co.uk/) but I would like to avoid the re-compression which cause lost of quality.

--- End quote ---

According to the link I gave above that software requires the files to be authorized to decode before you can convert them.  Could you try copying the files and converting them on a PC that does not have the Sony DRM software installed?   Should give you a good idea if they're encrypted or not.


--- Quote from: Ysl on October 04, 2009, 09:58:51 AM ---Where can I find more info about the Atrac codec in the latest builds. The decoding of Atrac files in rockbox doesn't seem to very well documented..(?)

--- End quote ---

What documentation exactly are you looking for?  Theres some here on the RealMedia page:

http://www.rockbox.org/wiki/RealMediaSupport

If you want to know more about ATRAC3 itself, the codec is from ffmpeg, who have some technical information about how it works.

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