Playing ambisonic *.amb files in Max/MSP

Nov 7, 2007 at 11:23am

Playing ambisonic *.amb files in Max/MSP

Hello,

I have downloaded these:

- a VST plug-in called “B2Stereo” (from the B2X plug-ins suite) that decodes B-format to stereo and that you can load into [vst~ 4 2]
- a file called “TetraMicSample.amb”

Now how can I “play” the *.amb file ? I don’t know anything about this format nor any VST *.amb player that can load into Max/MSP …

Is the *.amb the right standard for storing B-format ?

Thanks for your help
-j

#34500
Nov 7, 2007 at 11:57am

the .amb fileformat is really a Wave file with some custom GUIDs set
in the header (look up WAVE-EX) it’s supposed to provide a channel-
mask for automated recognition of the content and routing/decoding
accordingly. WAVE-EX is a microsoft construct, which doesn’t seem to
be parsed well (if at all) by max’s sfplay~.

the .amb file-spec is an attempt by people from the sursound
community to create a standard for ambisonic bformat files.

there’s really no need for that. you can rename the file .wav and use
a 4 channel sfplay~. it might complain about unrecognized header
stuff but shpould play the file just fine.

http://www.ambisonia.com/wiki/index.php/
Main_Page#File_Formats_for_Ambisonics

you can store b-format ambisdonic recordings in any file format you
wat, since it’s really “normal” audio with phase dependencies between
the channels. we normally just use interleaved AIFFs.

hth

/*j

On 07.11.2007, at 12:23, julienbreval wrote:

>
> Hello,
>
> I have downloaded these:
>
> – a VST plug-in called “B2Stereo” (from the B2X plug-ins suite)
> that decodes B-format to stereo and that you can load into [vst~ 4 2]
> – a file called “TetraMicSample.amb”
>
>
> Now how can I “play” the *.amb file ? I don’t know anything about
> this format nor any VST *.amb player that can load into Max/MSP …
>
> Is the *.amb the right standard for storing B-format ?
>
>
> Thanks for your help
> -j
>

#116606
Nov 7, 2007 at 1:34pm

Thanks for your anwser

After renaming the extension, Max can open the file in a sfplay~ or a buffer~, but it contains only silence (zeroes). Fortunately, it was possible to open it with Audacity and to export separated tracks that can then be loaded “normally” into Max objects …

#116607
Nov 8, 2007 at 1:29am

The only Mac program I know of that will open .amb files is TwistedWave
http://twistedwave.com/
This is actually due to a request by Daniel Courville, the guy who authored the B2X plugin suite. He also recommends De-Interleaver by Scott Wilson
http://scottwilson.ca/site/Software.html
I agree with Jasch, I’m not sure why they decided on WAVE-EX, it seems to be a dead end. It’s not even well supported on Windows.
cheers,
Jim

#116608
Nov 8, 2007 at 11:30am

Quote: voxish wrote on Thu, 08 November 2007 02:29
—————————————————-
> The only Mac program I know of that will open .amb files is TwistedWave
> http://twistedwave.com/
> This is actually due to a request by Daniel Courville, the guy who authored the B2X plugin suite. He also recommends De-Interleaver by Scott Wilson
> http://scottwilson.ca/site/Software.html
> I agree with Jasch, I’m not sure why they decided on WAVE-EX, it seems to be a dead end. It’s not even well supported on Windows.
—————————————————-

Actually, Audacity can open *.amb files even without renaming the extension to *.wav; then a message box prints “importing wave EX file” :)
I use it for separating interleaved files (and only for this) as the De-Interleaver link is broken on the Scott Wilson page.

#116609

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