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Форум » Elektropage.ru » Conquering the World III [smd] » muzic
muzic
Nemesis_cДата: Пятница, 30.09.2011, 02:17 | Сообщение # 1


 
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указатели на треки
$1dc598
тут самый говённый трек с титульного экрана - $1dc5c0
 
Nemesis_cДата: Понедельник, 10.09.2012, 14:07 | Сообщение # 2


 
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http://forums.sonicretro.org/index.php?showtopic=26350
ValleyBell:
I was always a fan of this sound driver.
It doesn't just use the LFO to make a nice vibrato and has lots of great PCM drums, but it's the only driver used in chinese pirates which actually sounds good. (if not great sometimes)

Recently I startet ripping another pirate with this sound driver and got the idea of reverse engineering the sound format.

Now, here are my results:

Data East music format:
Code
Header
------
Size    Description
4    Absolute ROM-Pointer to Track 1
4    Absolute ROM-Pointer to Track 2
4    Absolute ROM-Pointer to Track 3
4    Absolute ROM-Pointer to Track 4
4    Absolute ROM-Pointer to Track 5
4    Absolute ROM-Pointer to Track 6 (DAC)
6    Channel Assignment for tracks 1-6 (default: 00 01 02 04 05 06, later version only)
   -> these values specify the 4 lower bits of the Key On/Off command (028)
      changing these shuffles doesn't change the track's channel (only the key on/off channel),
      so you better don't change it
   -> a value of FF causes the driver to ignore the channel


Track Data
----------
The early sound driver used in Side Pocket has to additional bytes at the beginning of each track:
Code
Size    Description
1    unknown
1    Channel Assignment of current track
...    Commands

In later versions the track starts directly with the commands.

Code
Command  Description
00-7F aa    Note (7F = rest)
    -> aa = length
80 aa  Tempo (track 1 only)
    -> aa = Tempo Value (00 = slow, FF = fast)
82 aa  Instrument Change
    -> aa = Instrument No. in Instrument Lib
83 aa  Volume Change
    -> aa = Volume (TL value)
86 aa  Note Stop value (default 08)
    -> when a note is started, a length-counter is set to the note's length and counts down
       when this counter reaches a stop value that's adjusted by aa, the note is stopped
       when the counter reaches 0, the next note is processed
    -> aa = 08 makes stop value = 01 (always)
       aa > 08 can make the stop value negative or 00, resulting in bending notes
       aa < 08 make the stop value higher
    stop_value = 1 + round(note_len * (08 - aa) / 8)
      
    table from driver:
    07 -> 07 of 30, 04 of 18, 03 of 0C, 06 of 24
    06 -> 0D of 30, 07 of 18, 04 of 0C, 0A of 24
    05 -> 13 of 30, 0A of 18, 06 of 0C, 0F of 24
    04 -> 19 of 30, 0D of 18, 07 of 0C, 13 of 24
    03 -> 1F of 30, 10 of 18, 09 of 0C, 18 of 24
87  ??
88 aa  Loop Start (nested loops are possible)
    -> aa = loop count (00 = infinite)
89  Loop End
8D aa  ??
8E aa  set LFO register (022) (track 1 only)
    -> aa = LFO value (ored with 08)
8F  ??
90 aa bb    ??
91  ??
92 aa  Panorama
    -> aa = L/R mask
93 aa  ??
94 aa  ??
95  Track End
96 aa  DAC Volume (track 6 only)
    -> aa = Volume (00=loud, 03=low)


de2mid (with source, writing the tool took longer than reverse engineering the format, btw)

I didn't work on the unknown coordination flags yet, as I found them when testing de2mid.

Example call for de2mid:
de2mid BarverBattleSaga.bin l 0019868A 0x16
(extracts call songs from Barver Battle Saga, works only with the v1.00 translation patch)

Feedback and comments are welcome.

Update: updated tool to add full support for Side Pocket and added some more unknown flags
another example call: de2mid "Side Pocket (JU) [!].bin" le 30DDE
 
Nemesis_cДата: Понедельник, 10.09.2012, 14:10 | Сообщение # 3


 
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Data East Music Hacking/Music Pointers
This is a complete list of all known Sega Mega Drive games that use the Data East Music Engine.
Unless noted otherwise, the pointers are valid for all variants of a game. All song pointers are 32-bit big endian.

http://segaretro.org/Data_East_Music_Hacking/Music_Pointers
 
Nemesis_cДата: Понедельник, 10.09.2012, 14:24 | Сообщение # 4


 
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DAC Rate to Frequency Conversion with pretty accurate formulas

http://forums.sonicretro.org/index.p....y657850
 
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