Search found 575 matches

by cdifan
Mon Aug 28, 2017 7:49 pm
Forum: Philips CD-i Forum
Topic: Decoding CD-i audio files
Replies: 25
Views: 3369

Re: Decoding CD-i audio files

Those CD-DA files were extracted years 'n years ago (early '00s) and have been extensively listened to (still are). Same here, my mp3 files for The Apprentice are dated September 2001 :) They are still on my phone, I listened to them all just last week (I actually have all the Vision Factory audio ...
by cdifan
Sat Aug 26, 2017 10:23 pm
Forum: Philips CD-i Forum
Topic: Decoding CD-i audio files
Replies: 25
Views: 3369

Re: Decoding CD-i audio files

Next I will be taking a look at Dimo's Quest... Now that was really easy... Simply extracting all the .blk files, hexdumping them and using a few search patterns in vim quickly found all the sound effects in block 2 of the big.blk file in the RTF subdirectory of Dimo's Quest, using the exact same d...
by cdifan
Sat Aug 26, 2017 9:18 pm
Forum: Philips CD-i Forum
Topic: Decoding CD-i audio files
Replies: 25
Views: 3369

Re: Decoding CD-i audio files

I couldn't help myself and wrote a little tool today: C:\Tmp>apprsfx Usage: apprsfx levelN.dat Function: Extracts The Apprentice sound effects from level data Raw sound effect data is written to effectN_M.raw Written by CD-i Fan <cdifan@gmail.com> It is based on reverse-engineering the code that mix...
by cdifan
Sat Aug 26, 2017 1:40 pm
Forum: Philips CD-i Forum
Topic: Decoding CD-i audio files
Replies: 25
Views: 3369

Re: Decoding CD-i audio files

The sound parameters indicate that only half the filter and range parameters are set. The data samples are all ranging from 0x00 to 0x0F (using hex editor, so there's no mistaking it).. indicating that there really is no data in the other channel. Why? Why store a single channel in a stereo format?...
by cdifan
Tue Aug 22, 2017 9:57 pm
Forum: Philips CD-i Forum
Topic: Decoding CD-i audio files
Replies: 25
Views: 3369

Re: Decoding CD-i audio files

Okay, I think you've almost got it so giving you actual code should not be considered cheating. Here's C++ source from CD-i Emulator for playing a 4-bit sound unit: /** Plays 4-bit sound unit. * * @param pChannel Audio channel. * @param bParam Sound parameter byte. * @param pbData Sound unit data. *...
by cdifan
Sat Aug 19, 2017 12:11 pm
Forum: Philips CD-i Forum
Topic: Decoding CD-i audio files
Replies: 25
Views: 3369

Re: Decoding CD-i audio files

The Green Book makes for excellent bedtime reading, though :)
by cdifan
Fri Aug 18, 2017 4:21 pm
Forum: Philips CD-i Forum
Topic: Decoding CD-i audio files
Replies: 25
Views: 3369

Re: Decoding CD-i audio files

Shikotei wrote:
Fri Aug 18, 2017 11:50 am
The only format that the book mentions that could be in an audio sector is CD-DA 16bit at 44.1kHz (IV.2.F2).
You probably mean: "The only OTHER format ..."

And even that's not really true; MPEG Audio sectors are described in IX.5.2.
by cdifan
Fri Aug 18, 2017 4:20 pm
Forum: Philips CD-i Forum
Topic: Decoding CD-i audio files
Replies: 25
Views: 3369

Re: Decoding CD-i audio files

actually, decoding a single 18-byte soundgroup, of which there are 128 in a 2304-byte audio sector I think you mean "a single 128-byte soundgroup, of which there are 18 in a 2304-byte audio sector". Ye old switcharoo, but inconsistent data is not something I'd let go uncorrected. You are right of c...
by cdifan
Thu Aug 17, 2017 10:04 pm
Forum: Homebrew Forum
Topic: Microware OS-9 Manuals
Replies: 2
Views: 3692

Re: Microware OS-9 Manuals

These manuals are now also available from ICDIA in the Microware OS-9 Documentation section.
by cdifan
Thu Aug 17, 2017 9:35 pm
Forum: Philips CD-i Forum
Topic: Decoding CD-i audio files
Replies: 25
Views: 3369

Re: Decoding CD-i audio files

What you are describing above is helpful for understanding, but it's identical (except for the omission of Level A) to the CD-XA standards. Decoding for that audio format most certainly exists out there, see e.g. MESS, FFmpeg, and many other sources (I could provide sample code but it is already out...
by cdifan
Wed Aug 16, 2017 10:31 pm
Forum: Philips CD-i Forum
Topic: The Apprentice Regional Variations
Replies: 4
Views: 2737

Re: The Apprentice Regional Variations

There are no differences in the actual data bits between the EU and US versions.
The only difference is in the packaging and the mastering (leadin and leadout areas).

PS. I have both discs and checked this.
by cdifan
Sat Aug 12, 2017 11:25 pm
Forum: Homebrew Forum
Topic: Green Book now publicly available?
Replies: 8
Views: 2714

Re: Green Book now publicly available?

It's now also on ICDIA in the new CD-i Full Functional Specification (Green Book) section under CD-i DOCUMENTATION.
by cdifan
Sat Aug 12, 2017 11:22 pm
Forum: CD-i Marketplace Sell/Trade/Buy
Topic: Looking for a copy of The 7th Guest.
Replies: 6
Views: 2672

Re: Looking for a copy of The 7th Guest.

Check out this article from February 2017: The 7th Guest CD-i DVC Compatibility / Cake Puzzle Bug.

It's about the difference between the V1 and V2 versions and even offers a patch to change a V1 disc image into V2.
I haven't been able to get it working yet, though...
by cdifan
Sat Aug 12, 2017 11:04 pm
Forum: The New International CD-i Association (ICDIA)
Topic: CD-i Full Functional Specification (Green Book)
Replies: 0
Views: 885

CD-i Full Functional Specification (Green Book)

Added section containing CD-i Full Functional Specification (Green Book) documents: • Compact Disc Interactive Full Functional Specification - May 1994 This document is the official specification of the CD-i system. It was originally licensed under strict non-disclosure agreements but has been freel...
by cdifan
Wed Feb 22, 2017 9:12 pm
Forum: Philips CD-i Forum
Topic: Hello everyone!
Replies: 6
Views: 1234

Re: Hello everyone!

Okay, now you're making me curious :shock: