DCEmulation

LibADX - A Dreamcast K:OS ADX Decoding Library

Just to let you know, PH3NOM, you're more than welcome to upload any Dreamcast-related stuff as an attachment on a post here, and I'd encourage you to do so. It'd probably be a good idea too, just in case the files were to get deleted from megaupload or something like that. It'd be a shame to lose stuff due to that kind of thing happening.

Also, just as a minor nit-pick, there's no : in KallistiOS or in its abbreviation.

Thank you, i read someone was asking for it.
Is there a legal way to encode to adx ?

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Haven't looked at it, but I guess it runs on the SH4. Did the official games use the sound processor for decoding ADX files?

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FFMpeg should handle that just fine.
Although, looking at the source, that encoder does not support encoding loop information.



The ADX decoder consumes 1% of the Dreamcast's CPU.
http://www.segatech.com/technical/critools/index.html

I think the hard part with decoding ADX on the AICA would be streaming the encoded samples to the AICA.
It would be easy to upload an entire ADX to SRAM then decode it, but most ADX's will be to big to fit into SRAM, so it would need to be streamed somehow.
If anyone has some ideas on how to make this work, I would be interested to hear.

Can you give me a tutorial ?

_________________
Order Fast Striker, GunLord and NEO XYX for Dreamcast at http://www.ngdevdirect.com
Order 2d/3d Shoot 'em up Sturmwind http://www.redspotgames.com/shop
Order Dux 1.0, Redux incl. Dux 1.5 and The Ghost Blade at http://hucast.com/index.php

Wow, now that is a sserious surprise.
This might end some issues with audio formats.

Hum one question, when this is loaded, does it take over the whole sound system or is it possible to load any other formats through other libs ?

From a terminal



That will take an input wav and encode it as ADX and store it in a wav file. The input file can be a bunch of different formats... whatever ffmpeg is capable of decoding, be it ogg or mp3 or plain pcm. The output should be stored in a wav file - the header will have the compression type set in it. That is the simplest form of transcoding, and will have the same settings as the input file - if the input was mono and 44kHz, so will the output. If the input was 22kHz and stereo, so will the output.

To change the audio before encoding, you can use filters in ffmpeg, or a completely different app to pipe the data to ffmpeg. Here's how you use sox to pipe data to ffmpeg



That will have sox decode BadAppleEn.ogg into a wav at 90% volume with two channels and 22kHz sample rate that will be piped into ffmpeg which will then encode it to a wav with ADX encoding. If you needed it to be 8kHz mono 8-bit, you would do



EDIT: Found an issue with my instructions... you can't actually store an ADX stream in a wave. Weird, but ffmpeg won't do that. In fact, I'm having trouble finding an output format that WILL store an ADX stream. What good is ADX encoding if you can't save the encoded data? It won't even save it as raw data.

EDIT 2: Couldn't find anything on saving the output of ffmpeg when encoding as ADX. I guess for now it's wav2adx or nothing.

Funny, I thought I saw it abbreviated as K:OS somewhere...

And, stupid question; Now that megaupload is in limbo, how exactly to I upload files as attachments here?

You have to use the full "Post a reply" or "New topic" page to see the option, not the quick reply box at the bottom of the thread. Once you're on the full post editor, you should see a box labeled "Upload attachment" right underneath the Preview/Submit/Save/Cancel buttons. Pick your file, hit the add a file button, and you should be good to go.

You also should be able to upload an attachment if you just edit a post as well. The upload box should be in the same place.

If you don't see it, let me know, and I'll figure out why its not showing up.

Could you re-upload it plz?

Original post updated with attachment...