[FFmpeg-user] OMA playback

Paul B Mahol onemda at gmail.com
Wed Nov 20 21:33:39 EET 2024 

There are more .DAT files?

Are any of them having first few bytes as ascii characters that could
resemble chunk name?

On Wed, Nov 20, 2024 at 11:54 AM Dieter Van Hauwermeiren via ffmpeg-user <
ffmpeg-user at ffmpeg.org> wrote:

>  Ok great, thanks.I hope this one .DAT file with the EKB block will work
> for all files then because that's the only one on the walkman hard drive
> (that has a EKB block).
>     On Wednesday, November 20, 2024 at 09:37:25 AM GMT+1, Paul B Mahol <
> onemda at gmail.com> wrote:
>
>  Easier would be to add support to demuxer to search for *.DAT named files
> in current directory of OMA file. And use it for decrypting.
> I think you cut a lot of boring work for me, the recreation of *.DAT and
> *.OMA files.
> I think all necessary information is available to add support for such
> files to oma demuxer.
> I will work on this, and by end of this weekend it probably should be
> complete.
> So will give patch that you can then use to rebuild ffmpeg.
>
> On Wed, Nov 20, 2024 at 2:58 AM Dieter Van Hauwermeiren via ffmpeg-user <
> ffmpeg-user at ffmpeg.org> wrote:
>
> >  Paul,
> > In the files I recovered, I found a .dat file which has an EKB block in
> > it. Could this make things easier to reconstruct the .oma file's header
> and
> > EKB? You can find the file in attachment.
> >    On Tuesday, November 19, 2024 at 10:16:14 PM GMT+1, Paul B Mahol <
> > onemda at gmail.com> wrote:
> >
> >  Got running Windows XP in VM and app reported error so I abandoned idea
> to
> > consume more time on it.
> >
> > Now that I think about it again I figured out that it might be possible
> to
> > reproduce your situation but keeping all files, if possible.
> > Then I could search for relevant files and bytes that are needed to
> decrypt
> > new audio files, in hope something obvious will pop up that could show a
> > way to recover your files too.
> >
> > If I get bored again I could try this, but because searching for relevant
> > files  might not be trivial I may do it later than sooner.
> >
> > On Tue, Nov 19, 2024 at 6:11 PM Dieter Van Hauwermeiren via ffmpeg-user <
> > ffmpeg-user at ffmpeg.org> wrote:
> >
> > >  Hi Paul,
> > > Were you able to find a way to change the layout of the GEOB binary
> parts
> > > of the .OMA files?
> > > Best,
> > > Dieter
> > >    On Wednesday, November 13, 2024 at 07:28:54 PM GMT+1, Dieter Van
> > > Hauwermeiren via ffmpeg-user <ffmpeg-user at ffmpeg.org> wrote:
> > >
> > >  Okay, thank you!Maybe it's worth noting that I extracted the .oma
> files
> > > directly from the hard drive of my old Sony NW-HD1. My walkman was dead
> > but
> > > I wanted to recover the audio files so I demounted the hard drive and
> was
> > > able to find an adapter on Amazon to transfer the files directly from
> the
> > > hard drive onto my pc. Maybe this is the reason why the GEOB frame is
> > > different.
> > > I was able to contact someone who helped develop ffmpeg and he wrote me
> > > the following:
> > > - It's using a different GEOB frame ("OMG_ULINF" vs. "OMG_LSI").
> > > - Only a KEYRING subobject is contained in the binary chunk, no header
> > > and no EKB.
> > > - It's using a different root key than the usual one from SonicStage
> > > (0x00010013 vs. 0x0001001d).
> > > He also added the following link:
> > > https://wiki.videolan.org/SoC_2011/OMA/Atrac_Improvements/Hope this
> > helps.
> > > Best regards,
> > > Dieter    On Wednesday, November 13, 2024 at 10:22:29 AM GMT+1, Paul B
> > > Mahol <onemda at gmail.com> wrote:
> > >
> > >  Looks like ffmpeg can not process it because files lack some geob
> binary
> > > chunk that it expects.
> > > When inspecting files I found out similar binary chunks that appears to
> > > contain same data but at different layout.
> > > I downloaded old SonicStage and will try to find out if its OpenMG
> binary
> > > code have any mention of those binary geob chunks and try to see if it
> > can
> > > be reused somehow to decrypt files.
> > >
> > > On Tue, Nov 12, 2024 at 11:29 PM Dieter Van Hauwermeiren via
> ffmpeg-user
> > <
> > > ffmpeg-user at ffmpeg.org> wrote:
> > >
> > > >  Sorry about that, I changed the privacy settings for the files. It
> > > should
> > > > work now.
> > > >
> > >
> >
> https://drive.google.com/file/d/1pQkvSAx5GaCARI7WnHHNW4uDhcHBwSZy/view?usp=drive_linkhttps://drive.google.com/file/d/1-peYBsAhYHCgFgqNCqjkx-Ij1NXvOWI3/view?usp=drive_linkhttps://drive.google.com/file/d/1iJFrFGSjtG7JNGZTpjcJRWW3d21ZrwfL/view?usp=drive_link
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >    On Tuesday, November 12, 2024 at 11:10:30 PM GMT+1, Paul B Mahol <
> > > > onemda at gmail.com> wrote:
> > > >
> > > >  I get Access denied. So needs some permissions change to actually
> > > download
> > > > file(s).
> > > >
> > > > On Tue, Nov 12, 2024 at 10:40 PM Dieter Van Hauwermeiren via
> > ffmpeg-user
> > > <
> > > > ffmpeg-user at ffmpeg.org> wrote:
> > > >
> > > > >  Thanks for your response.I've provided the links to three
> > .OMA-files:
> > > > >
> > > >
> > >
> >
> https://drive.google.com/file/d/1pQkvSAx5GaCARI7WnHHNW4uDhcHBwSZy/view?usp=drive_linkhttps://drive.google.com/file/d/1-peYBsAhYHCgFgqNCqjkx-Ij1NXvOWI3/view?usp=drive_linkhttps://drive.google.com/file/d/1iJFrFGSjtG7JNGZTpjcJRWW3d21ZrwfL/view?usp=drive_link
> > > > >    On Tuesday, November 12, 2024 at 10:22:38 PM GMT+1, Paul B
> Mahol <
> > > > > onemda at gmail.com> wrote:
> > > > >
> > > > >  On Tue, Nov 12, 2024 at 8:59 PM Dieter Van Hauwermeiren via
> > > ffmpeg-user
> > > > <
> > > > > ffmpeg-user at ffmpeg.org> wrote:
> > > > >
> > > > > > Hi,
> > > > > > I have a question regarding the playback of .OMA files with
> > > ffmpeg.The
> > > > > > .OMA files I would like to play come from a recovered hard disk
> > from
> > > a
> > > > > Sony
> > > > > > NW-HD1 walkman. These files were added to the walkwan using Sony
> > > > > > Sonicstage. As many users found out the hard way, Sonicstage
> > > encrypted
> > > > > and
> > > > > > DRM protected the audio files by default when transferring them
> to
> > > the
> > > > > > walkwam. On top of that, the audio files couldn't be played back
> > in a
> > > > > newly
> > > > > > installed version of Sonicstage because the original installed
> > > version
> > > > > was
> > > > > > associated with a unique encryption key. When I changed
> computers,
> > I
> > > > > found
> > > > > > out that the original encryption key was still on the computer I
> > > threw
> > > > > away.
> > > > > > So because of this, I have a library of .OMA files I cannot
> play. I
> > > > have
> > > > > > read through numerous forums and tried out various proposed
> > solutions
> > > > but
> > > > > > so far, none of them has worked. Various solutions include the
> use
> > of
> > > > > > ffmpeg, even when the audio files are protected but it doesn't
> seem
> > > to
> > > > > work
> > > > > > for the files I try to play.Could someone help me with this? I
> can
> > > > always
> > > > > > send a test .OMA file. A big thanks in advance.
> > > > > > Kind regards,
> > > > > >
> > > > >
> > > > > Feel free to provide link to uploaded .OMA file(s) that are not
> > > > supported.
> > > > >
> > > > >
> > > > > > Ronnie
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