Does anybody know an Codec for CELP (Olympus DP-211)?

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Does anybody know an Codec for CELP (Olympus DP-211)?

Post by patefacere on Wed Jan 18, 2017 2:34 pm


The short question is:
Is there an player that can play audio files from an device called "Olympus DP-211" from the company Olympus?
OR
Does anybody know an Codec named "CELP" or software that can play "CELP" codec audio files (wav format)?


If both of these answers are "NO", then please read further.

I have an recording device called "Olympus DP-211" which broke.
It has no ports what so ever, so I build out it's memory and analyzed it.

The recording goes through an codec and moves through an binary system and is formated to an this device (Olympus DP-211) exclusive file.
The binary sections are quite similar to another, which is why I am assuming that it is some sort of firmware.

All files are encrypted and named alphabetically with three digits:
.aaa, .aab, .aac, etc...
and begin with "PLSB".

What is weird is the path.
Normally an path begins with the mpr and then goes to the system files. But here it begins with an specific section instead.
I am guessing (with emphasis on "guessing") that the actual audio file is the Body of the complete file (the file created when something is recorded).
So I extracted it and found that it has this "CELP" format, but no audio format.


Now I am looking for an Codec (maybe for .wav) that can play "CELP".


I am looking forward for ideas.
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Re: Does anybody know an Codec for CELP (Olympus DP-211)?

Post by Admin on Wed Jan 18, 2017 4:39 pm

Can you upload a sample file for me?

Is MediaInfo able to provide any details about the file?

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Re: Does anybody know an Codec for CELP (Olympus DP-211)?

Post by nikkoaki on Tue Jan 24, 2017 11:28 pm

CELP itself is not a codec, it's an algorithm that can be used in other codecs. Speex and G.718 for ex uses it, even mpeg4 for speech.
It's a very old proprietary niche thing and hard to come by.

This guy has (had) the same problem as you: http://ffmpeg.gusari.org/viewtopic.php?f=11&t=1304
Searching for the coded (smcelp32.acm) yields : https://www.moviecodec.com/audio-codecs/missing-audio-codec-tag-120-42360/

I doubt this will ever be supported by ffmpeg/etc because it's so low priority so your best bet is installing software that uses that proprietary format.

EDIT: on that last website i posted you have different kinds of softwares that play the format but if you scroll down to the last post you will get a small tutorial on how to install just the "codec".

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