Re: [linux-audio-dev] Olypus voice recorder - codec?

From: Dan Stromberg <strombrg@email-addr-hidden>
Date: Fri Jan 06 2006 - 05:25:00 EET

On Tue, 2006-01-03 at 17:50 +1100, Erik de Castro Lopo wrote:
> David Santinoli wrote:
>
> > AFAICT the encoding should be (Adaptive Differential Pulse Code
> > Modulation). Don't know about the file container though...
>
> There are at least 50 different, mutually incompatible types
> of ADPCM. For instance, libsndfile supports:
>
> SF_FORMAT_IMA_ADPCM /* IMA ADPCM. */

The data is coming out of the windows app in this format: IMA ADPCM,
that is.

But unfortunately, I don't seem to be having much luck discovering what
codec they actually spit out of the voice recorder, prior to the
application apparently converting it to IMA ADPCM.

> SF_FORMAT_MS_ADPCM /* Microsoft ADPCM. */
> SF_FORMAT_VOX_ADPCM /* OKI / Dialogix ADPCM */
> SF_FORMAT_G721_32 /* 32kbs G721 ADPCM encoding. */
> SF_FORMAT_G723_24 /* 24kbs G723 ADPCM encoding. */
> SF_FORMAT_G723_40 /* 40kbs G723 ADPCM encoding. */
>
> which is a mere drop in the bucket.
>
> Erik
Received on Fri Jan 6 08:15:04 2006

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