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Fix playback of OPL2 samples with an OPL3 chip.

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Subversion-branch: /research
Subversion-revision: 1496
This commit is contained in:
Simon Howard 2009-04-05 21:30:46 +00:00
parent 8c23c48bb7
commit 591cc474c5
1 changed files with 20 additions and 0 deletions
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20
opl/droplay/droplay.c
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@ -7,10 +7,21 @@
#define HEADER_STRING "DBRAWOPL"
#define ADLIB_PORT 0x388
// #define DEBUG
void write_reg(unsigned int reg, unsigned int val)
{
int i;
// This was recorded from an OPL2, but we are probably playing
// back on an OPL3, so we need to enable the original OPL2
// channels. Doom does this already, but other games don't.
if ((reg & 0xf0) == 0xc0)
{
val |= 0x30;
}
outb(reg, ADLIB_PORT);
for (i=0; i<6; ++i)
@ -101,15 +112,24 @@ void play_file(char *filename)
if (reg == 0x00)
{
#ifdef DEBUG
printf("usleep %i ms\n", val);
#endif
usleep(val * 1000);
}
else if (reg == 0x01)
{
val |= (fgetc(stream) << 8);
#ifdef DEBUG
printf("usleep %i ms\n", val);
#endif
usleep(val * 1000);
}
else
{
#ifdef DEBUG
printf("write_reg %02x = %02x\n", reg, val);
#endif
write_reg(reg, val);
}
}