CDA music tracks file format
  by Wojtek Kaniewski 1997

  Note: Everything in this file is based on my own investigations.
        All information that you'll find in this text file do not
        come from Microsoft Corp.

  CDA files are generally RIFF resources. The RIFF id of .CDA file is
  "CDDA" (43h, 44h, 44h, 41h). They contain only one data block
  called "fmt " (66h, 6dh, 74h, 20h). In current version of .CDA file,
  this block is 24 bytes long. Here's structure of it:

     Offset  Length  Description
     00h     02h     CDA file version. Currently equals 1. If it has
                     other value, following data may be out of date.
     02h     02h     Number of track.
     04h     04h     CD disc serial number (the one stored in CDPLAYER.INI)
     08h     04h     Beginning of the track in HSG format.
     0Ch     04h     Length of the track in HSG format.
     10h     04h     Beginning of the track in Red-Book format.
     14h     04h     Length of the track in Red-Book format.

  As you see, time is represented in two formats: HSG and Red-Book.
  HSG can be calculated as following: 
    
    time = minute * 4500 + second * 75 + frame

  Red-book is much easier to use, because it contains minutes,
  seconds and frames in unmodified form, byte-packed:

     Offset  Length  Description
     00h     01h     Frame
     01h     01h     Second
     02h     01h     Minute
     03h     01h     not used

  Now, I'll show you an example file. First part is a hex dump
  of the file, the second is the explanation of the fields.

     52 49 46 46 24 00 00 00  43 44 44 41 66 6D 74 20  RIFF$...CDDAfmt 
     18 00 00 00 01 00 04 00  B8 24 F6 00 F7 11 01 00  .........$......
     B4 5C 00 00 0A 25 0F 00  20 10 05 00              .\...%.. ...

     01 00       - first version of CDA file :)
     04 00       - fourth track
     B8 24 F6 00 - serial number of CD in CDPLAYER.INI is [F623B8]

     F7 11 01 00 - begining of track in HSG format
     B4 5C 00 00 - length of track in HSG format

     0A 25 0F 00 - begining of track in Red-Book format (15:37)
     20 10 05 00 - length of track in Red-book format (05:16)

  That's all. It should be enough to write CDA Viewer :) If you need more
  info or something isn't clear, feel free to write.

  Wojtek Kaniewski
  wojtekka@logonet.com.pl