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00993: sharrier: [debug] Crashes when a specific sample is being played during gameplay.

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This commit is contained in:
Phil Bennett 2010-01-30 19:52:06 +00:00
parent 13d0f42a42
commit 662a0aafda
1 changed files with 6 additions and 1 deletions
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7
src/emu/sound/segapcm.c
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@ -14,6 +14,7 @@ struct _segapcm_state
const UINT8 *rom; const UINT8 *rom;
int bankshift; int bankshift;
int bankmask; int bankmask;
int rgnmask;
sound_stream * stream; sound_stream * stream;
}; };
@ -29,6 +30,7 @@ INLINE segapcm_state *get_safe_token(running_device *device)
static STREAM_UPDATE( SEGAPCM_update ) static STREAM_UPDATE( SEGAPCM_update )
{ {
segapcm_state *spcm = (segapcm_state *)param; segapcm_state *spcm = (segapcm_state *)param;
int rgnmask = spcm->rgnmask;
int ch; int ch;
/* clear the buffers */ /* clear the buffers */
@ -70,7 +72,7 @@ static STREAM_UPDATE( SEGAPCM_update )
} }
/* fetch the sample */ /* fetch the sample */
v = rom[addr >> 8] - 0x80; v = rom[(addr >> 8) & rgnmask] - 0x80;
/* apply panning and advance */ /* apply panning and advance */
outputs[0][i] += v * voll; outputs[0][i] += v * voll;
@ -103,7 +105,10 @@ static DEVICE_START( segapcm )
mask = BANK_MASK7>>16; mask = BANK_MASK7>>16;
len = device->region->bytes(); len = device->region->bytes();
spcm->rgnmask = len - 1;
for(rom_mask = 1; rom_mask < len; rom_mask *= 2); for(rom_mask = 1; rom_mask < len; rom_mask *= 2);
rom_mask--; rom_mask--;
spcm->bankmask = mask & (rom_mask >> spcm->bankshift); spcm->bankmask = mask & (rom_mask >> spcm->bankshift);