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SubjectRe: Elsemi, maybe you can help with Yamaha ADPCM? Reply to this message
Posted byElSemi
Posted on09/22/04 07:50 AM

> > > I'm having a small problem, I want to be able to encode yamaha adpcm files
> and
> > > decode them as well. I am aware bero has made a program, however it doesnt
> > seem
> > > to work properly, I get ALOT of static on decode, with the volume ever
> > changing.
> > > Do you or does anyone here have any technical notes regarding this or know
> of
> > > any program or even an ACM codec capable of handiling this format? I did
> > notice
> > > its ID tag was 0x20, which is Yamaha's ADPCM format, so I am certain thats
> > what
> > > this is. Thanks so much.
> > >
> >
> >
> > which yamaha chip in particular?
> >
> >
> > You learn something old everyday...
> >
> sorry for the VERY late reply, was without a computer. The type is aica adpcm
> and from what ive read it is similar to the YMZ280B chip.

Yes, AICA adpcm is the same than YMZ280B, I've done the Chankast AICA emulation and it works fine.
Are you decoding "online" from an emulator or just a stream stored in a file? volume changes often happen when you miss an adpcm sample, if you are resampling, keep in mind that you can't just skip apdcm samples, you must process all samples even if they don't get written to the output buffers due to the resampling.

Entire Thread
Subject  Posted byPosted On
*Elsemi, maybe you can help with Yamaha ADPCM?  Purge07/30/04 07:38 PM
.*Re: Elsemi, maybe you can help with Yamaha ADPCM?  finaldave08/01/04 06:30 PM
..*Re: Elsemi, maybe you can help with Yamaha ADPCM?  Purge09/21/04 11:39 PM
....Re: Elsemi, maybe you can help with Yamaha ADPCM?  ElSemi09/22/04 07:50 AM
....*Re: Elsemi, maybe you can help with Yamaha ADPCM?  Purge09/22/04 12:04 PM