1. 4-Bit wave files??
Does anyone know how to convert 4-bit wave file data into 8-bit?
Or where i can find the info? It seems to have a different format than
8 bit waves, "ADPCM" instead of "PCM". I'm trying to add more different
wave file formats to Ecstacy, So far i've got 16 bit to 8 bit conversion
working fine. I'll upload an update in a few days.
-Mark.
2. Re: 4-Bit wave files??
Use "Cool edit". Loads and save about any format.
> Does anyone know how to convert 4-bit wave file data into 8-bit?
> Or where i can find the info? It seems to have a different format than
> 8 bit waves, "ADPCM" instead of "PCM". I'm trying to add more different
> wave file formats to Ecstacy, So far i've got 16 bit to 8 bit conversion
> working fine. I'll upload an update in a few days.
>
> -Mark.
>
Best Regards,
Tor
3. Re: 4-Bit wave files??
Why would anyone want use a four bit wave file? Even if it was converted
to 8 bit it would not sound very good.
Bernie
4. Re: 4-Bit wave files??
>Why would anyone want use a four bit wave file? Even if it was converted
>to 8 bit it would not sound very good.
That's kind of like saying...
Why use vga when i can use SVGA...
or
Why use a 386 when I can use a Pentium III (or why use my LC-III when I can
use my g-3 ((for all you Mac Heds out there)))
...
I sent Mark two wave files that I had on hand one that was sent to me, and
the other was one I created...one 4 bit (I think to save space when sent
over the net to me so it was smaller) and the other a 16 bit that I created
myself. I think the point is you never know what software a user is going
to want to create with his program, so you need to be able to be as flexible
as possible.
(Cool Edit is great for everone who is pre-converting their wave files
before they play their game)
Monty
5. Re: 4-Bit wave files??
The most popular sound files are recorded as 8 BIT PCM ( Pulse Code
Modulation ).
With ADPM ( Adaptive Differential Pulse Code Modulation ) once a file has
been compressed it CAN NO LONGER BE EDITED or MODIFIED.
If your talking about 4 bit compressed files.
The format of the VOC block type 9 for creative labs
is the following :
-- BYTE ------------------ Description
0 "09"
1-3 Block length (length of digitized data in bytes plus 12)
4-7 Samples per second ( actual sampling frequency )
8 Bits per sample ( bits per sample after compression, if any )
9 Channels ( 1 mono 2 stereo
10-11 Format tag:
#0000 -- 8 bit unsigned PCM
#0001 -- Creative 8 bit to 4 bit ADPCM
#0002 -- Creative 8 bit to 3 bit ADPCM
#0003 -- Creative 8 bit to 2 bit ADPCM
#0004 -- 16 bit signed PCM
#0006 -- CCITT a-Law
#0007 -- CCITT u-Law
#0200 -- Creative 16 bit to 4 bit ADPCM
12-15 Reserved ( fill with zeros )
Maybe this will give you an idea of how to decode.
Bernie
