Replacing music and sounds

[Shekel]

I doubt anyone's testing this out but here's a list of mpeg addresses if you want to use custom mp2s. Note that there's a few shared ones, meaning it's only possible to have one or the other.

Code: Select all

   //Daytona USA 2 / Power Edition
   LoadMP2File(0x109e8, "Daytona USA 2 - Attract.mp2"); //shared address
   LoadMP2File(0x1214aa, "Daytona USA 2 - Beginner.mp2");
   LoadMP2File(0x2bc7ac, "Daytona USA 2 - Advanced.mp2");
   LoadMP2File(0x3cddae, "Daytona USA 2 - Expert.mp2");
   LoadMP2File(0xd80e02, "Daytona USA 2 - Attract (Japanese).mp2");
   LoadMP2File(0x5177b0, "Daytona USA 2 - Beginner (Japanese).mp2");
   LoadMP2File(0x7cd0b4, "Daytona USA 2 - Advanced (Japanese).mp2");
   LoadMP2File(0x8df436, "Daytona USA 2 - Expert (Japanese).mp2");
   LoadMP2File(0xa29978, "Daytona USA 2 - How To.mp2");
   LoadMP2File(0xb1427a, "Daytona USA 2 - Select.mp2");
   LoadMP2File(0xc4213e, "Daytona USA 2 - Name Entry.mp2");
   LoadMP2File(0xcc9380, "Daytona USA 2 - Ending (Beginner).mp2");
   LoadMP2File(0xcc9380, "Daytona USA 2 - Ending (Advanced).mp2");
   LoadMP2File(0xe8de44, "Daytona USA 2 - Ending (Expert).mp2");
   LoadMP2File(0xf458c6, "Daytona USA 2 - Ending (Expert2).mp2");
   LoadMP2File(0x76ff34, "Daytona USA 2 - Goal (Beginner.)mp2");
   LoadMP2File(0x78c136, "Daytona USA 2 - Goal (Advanced).mp2");
   LoadMP2File(0x7a7c78, "Daytona USA 2 - Goal (Expert).mp2");
      
   //Scud Race / Scud Race Plus
   LoadMP2File(0x463745, "Scud Race - Select.mp2");
   LoadMP2File(0x2afa83, "Scud Race - Super Beginner.mp2");
   LoadMP2File(0x1d4b42, "Scud Race - Beginner (Day).mp2");
   LoadMP2File(0x0e7e41, "Scud Race - Beginner (Night).mp2");
   LoadMP2File(0x000000, "Scud Race - Medium.mp2");
   LoadMP2File(0x37a4c4, "Scud Race - Expert.mp2");
   LoadMP2File(0x58efc8, "Scud Race - Goal.mp2");
   LoadMP2File(0x4f5fc7, "Scud Race - Name Entry.mp2");
   LoadMP2File(0x5c6f49, "Scud Race - Ending.mp2");
   
   //Sega Rally 2
   LoadMP2File(0x109e8, "Sega Rally 2 - Attract.mp2"); //shared address
   LoadMP2File(0x1e576a, "Sega Rally 2 - Attract Japanese.mp2");
   LoadMP2File(0xcf517a, "Sega Rally 2 - Select.mp2");
   LoadMP2File(0xade038, "Sega Rally 2 - Desert.mp2");
   LoadMP2File(0x3452ac, "Sega Rally 2 - Mountain.mp2");
   LoadMP2File(0x5d1ab0, "Sega Rally 2 - Snowy.mp2");
   LoadMP2File(0x109e8, "Sega Rally 2 - Riviera.mp2"); //shared address
   LoadMP2File(0x51a02e, "Sega Rally 2 - Goal.mp2");
   LoadMP2File(0x976934, "Sega Rally 2 - Ending.mp2");
   LoadMP2File(0xa60ff6, "Sega Rally 2 - Ranking.mp2");
   LoadMP2File(0xf95fbe, "Sega Rally 2 - Game Over.mp2");
   LoadMP2File(0xd9f87c, "Sega Rally 2 - Desert Practise.mp2");
   LoadMP2File(0x7b22f2, "Sega Rally 2 - Mountain Practise.mp2"); //shared address
   LoadMP2File(0x7b22f2, "Sega Rally 2 - Snowy Practise.mp2"); //shared address
   LoadMP2File(0x109e8, "Sega Rally 2 - Riviera Practise.mp2"); //shared address


[Bart]

Would you be able to change just one thing for this music hack? No rush, though.

Somehow just load files on a per-game basis? Doesn't seem like I can work around 2 games using the same address, unless there's already a way.

The right way to do it is to pass the game object down to the DSB but that would require you to modify more than one file each time you pull from SVN. So a hackier way to do it is use an if-statement that tests the loaded MPEG ROM for signature bytes.

You can do it using a hex editor on the first of the two ROMs. Or you can print out the first few bytes by inserting this handy-dandy piece of code anywhere in CDSB1::Reset() and CDSB2::Reset():

Code: Select all

for (int i = 0; i < 16; i++)
{
  printf("mpegROM[0x%02x] == 0x%02x\n", i, mpegROM[i]);
}


This will print out the first 16 bytes of the MPEG ROM space. Dollars to donuts these will be unique based on the game. Find a series of bytes (maybe only a single byte is needed) to identify the game. Let's pretend it's bytes 5 and 6. You would then enclose your LoadMP2File() calls like this:

Code: Select all

if (mpegROM[0x05] == 0xaa && mpegROM[0x06] == 0xbb) // if byte 5 is 0xaa AND byte 0x06 is 0xbb, then Daytona 2 detected
{
  LoadMP2File(...);
  ...
} else if (mpegROM[0x05] == 0x12 && mpegROM[0x06] == 0x13) // Sega Rally 2 detected
{
  ...
}
else
  printf("Unable to detect game. Not loading any custom music.\n");


I don't have the emulator handy right now so you'll have to find the real values yourself. These were just made up as examples. You may also only need to check a single byte if you can find one that is unique to each game. Then your test will simply be something like:

Code: Select all

if (mpegROM[0x03] == 0x59)


Hope that makes sense. This is a hideous hack but if it works it works

[Shekel]

They're the same :) Scud's different, though.





Edit: Added this as well just to show



Edit 2: Sega Rally 2, Daytona 2, Star Wars and Spikeout all share the same numbers.

[Bart]

Whoa. That's weird. You have a few options: try searching further into the ROM until you see some differences. Hex editor might help here. To search from the first megabyte onwards (1024*1024 bytes = 1 megabyte), you could do:

Code: Select all

for (int i = 1024*1024; i < 1024*1024+16; i++)


Alternatively, you could try poking around progROM rather than mpegROM for unique signature bytes. The programs are likely to be the same but if you pop it open in a hex editor, you will likely see some ASCII strings identifying the ROM program and there may be a difference at some address.

[Shekel]

These numbers further on are different, thanks.

I'll see what I can do with this now.

[Shekel]

Been trying to work out why this gives an undeclared identifier error but can't. It says the errors are on the mpegROM lines or word.

Code: Select all

   if (mpegROM[0x10000] == 0x77)
   {
      LoadMP2File(0x109e8, "Daytona USA 2 - Attract.mp2");
   }
   else if (mpegROM[0x10000] == 0x6c)
   {
      LoadMP2File(0x109e8, "Sega Rally 2 - Attract.mp2");
   }
   else
      printf("Unable to detect game. Not loading any custom music.\n");

[Bart]

Ah I forgot that LoadCustomMusic() is a static function and does not have access to the DSB's internal variables. Easily rectified. Three steps:

1. You need to move the call to LoadCustomMusic() out of CDSB1::CDSB1() and CDSB2::CDSB2() and into CDSB1::Reset() and CDSB2::Reset(). The reason for this is that the mpegROM memory has not yet been attached at this point. By the time Reset() is called, it has been.
2. Change it to be called like this:

Code: Select all

LoadCustomMusic(mpegROM);


3. Finally, change the function signature itself to accept this new param:

Code: Select all

static void LoadCustomMusic(const uint8_t *mpegROM)


[Shekel]

3. Finally, change the function signature itself to accept this new param:

Code: Select all

static void LoadCustomMusic(const uint8_t *mpegROM)


With you, fella, right up to this bit :) Where does this go?

[Bart]

3. Finally, change the function signature itself to accept this new param:

Code: Select all

static void LoadCustomMusic(const uint8_t *mpegROM)


With you, fella, right up to this bit Where does this go?

The first line of that function is the signature and right now, it accepts no parameters:

Code: Select all

static void LoadCustomMusic()

You need to change it to what I put above.

[terminator2k2]

reading this with interest...but oh my its way above my head lol