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SubjectElsemi, maybe you can help with Yamaha ADPCM? new Reply to this message
Posted byPurge
Posted on07/30/04 07:38 PM



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.


SubjectRe: Elsemi, maybe you can help with Yamaha ADPCM? new Reply to this message
Posted byfinaldave
Posted on08/01/04 06:30 PM



> 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...



SubjectRe: Elsemi, maybe you can help with Yamaha ADPCM? new Reply to this message
Posted byPurge
Posted on09/21/04 11:39 PM



> > 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.



SubjectRe: Elsemi, maybe you can help with Yamaha ADPCM? new 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.




SubjectRe: Elsemi, maybe you can help with Yamaha ADPCM? Reply to this message
Posted byPurge
Posted on09/22/04 12:04 PM



Alright, thank you, I will give it a shot. I am handling it from a file and perhaps im not handling my block sizes correctly. I will experiment around a bit. Thank you once again for your help.
> > > > 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.
>



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