5 Jan
2006
5 Jan
'06
11:25 p.m.
On Tue, 2006-01-03 at 17:50 +1100, Erik de Castro Lopo wrote:
David Santinoli wrote:
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.
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. */ 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