/*

Example code for loading and installing VAB data from the boot CD

Copyright 1998 Dominic Collins

 Feel free to use this code in your games; it's much less annoying than
downloading lots of pointless data through the serial link. :(

 To use, set the variables and #defines as appropriate.
Then call InitSound() before using any music, and call Shutdown()
before quitting.

 To play a SEQ using the loaded VAB, use
	SsSeqPlay(SEQNum[music], SSPLAY_PLAY, SSPLAY_INFINITY);
 or similar, where music=number of SEQ file to play.
*/

// Definitions used by the code:
#define DATA_START (0x80090000)		// Start of VAB data	
#define VH_Start_Addr (DATA_START)	// Start of VH data
#define VB_Start_Addr (VH_Start_Addr+0xED00)	//Start of VB data
#define Number_of_Musics 3	// Number of SEQ files in game (max 32)
// Start addresses of SEQ data;
// Change to whatever, or use the Batch File Assistant program.
#define Seq1_Start_Addr 0x80100d00
#define Seq2_Start_Addr (Seq1_Start_Addr+Seq1_Length)
#define Seq3_Start_Addr (Seq1_Start_Addr+Seq1_Length+Seq2_Length)

// Variables
char	musicflag=1;
CdlFILE	fp;	// File pointer for loading files
u_char	cdreadresult=0;	// Result of file load (error or zero)
short	vabid;	// VAB identifier
short	SEQNum[Number_of_Musics];	// SEQ identifier(s)
// Pointers to SEQ files in memory
ulong*	SeqStart[Number_of_Musics]={
(ulong*) Seq1_Start_Addr, 
(ulong*) Seq2_Start_Addr,
(ulong*) Seq3_Start_Addr
};

InitSound()
{

// In case another game has changed the volume:
printf("Setting main volume to maximum\n");
SsSetMVol(127, 127);

printf("Loading VH data from CD...");

if (CdSearchFile(&fp, "\\DATA\\SOUND\\STD0.VH;1")!=0)
	{
	CdReadFile("\\data\\sound\\std0.vh;1", (u_long*)VH_Start_Addr, 0);
	printf("Reading data...");
	CdReadSync(0, &cdreadresult);
	printf("Done!\n");
	}
else	{
		printf("Load failed!\nSorry, no music...\n");
		}


printf("Loading VB data from CD...");

if (CdSearchFile(&fp, "\\DATA\\SOUND\\STD0.VB;1")!=0)
	{
	CdReadFile("\\data\\sound\\std0.vb;1", (u_long*)VB_Start_Addr, 0);
	printf("Reading data...");
	CdReadSync(0, &cdreadresult);
	printf("Done!\n");
	}
else	{
		printf("Load failed!\nSorry, no music...\n");
		}


printf("Installing instruments...");
vabid=SsVabTransfer((u_char*)VH_Start_Addr, (u_char*)VB_Start_Addr, -1, 1);
if (vabid<0)
	{
	printf("Failed!\nSorry, no music.\n");
	musicflag=0;
	/*
	Note that I deliberately did NOT set 'musicflag=0' when the load
	failed in case the VH and VB files have been downloaded normally
	(through the serial link). This could happen if you have a
	game which uses SEQ files or can play audio CDs instead.
	*/
	}
else {
	printf("OK\nHouston, we have music!\n");
	}

if (musicflag)
	{
	for (i=0; i<Number_of_Musics ; i++)
		{
		// Install the SEQs.
		SEQNum[i]=SsSeqOpen(SeqStart[i], vabid);
		}
	}
}

Shutdown()
{
printf("Closing down...");

SsVabClose(vabid);

for (i=0; i<Number_of_Musics; i++)
	{
	SsSeqClose(SEQNum[i]);
	}
	
printf("Done\n");
}

/*

Note that, if you're desperately low on memory, you can store TIM data
in the region where the VAB file is loaded to. Just make sure that:
(1). You install all the TIMs before caling InitSound()
(2). You don't reinstall the TIMs after calling InitSound()
(3). You don't overwrite any TIMs in the frame buffer, which would
    necessitate reinstalling them.

If you're really desparate for memory, you can use the VB data area
for a buffer etc. after calling InitSound(), e.g.

--- begin example code
PACKET *packetbuffer[2];

Init();
{
InitTIMs();
InitSound();
packetbuffer[0]=(PACKET*)VB_Start_Addr;
packetbuffer[1]=packetbuffer[0]+200680; // Arbitrary offset;
										//  here equal to
										//   half of VB size
// etc.
}

mainloop()
{
static char quit;
quit=0;

while (quit)
	{
	currentbuffer=GsGetActiveBuff();
	GsSetWorkBase(packetbuffer[currentbuffer]);
	//etc.
	}
}
--- end example code

Use these techniques at your own risk. I haven't tested them or
debugged them or anything.

Note that these memory-saving tactics are not endorsed by Sony, and
may or may not constitute a QC faliure. In other words, using these
tricks may make your game ineligible for being on a magazine cover disk. 
I haven't really researched this.

Also, do not under any circumstances overwrite the VH data, as this may
do bad things.
*/