.improved CDD TOC emulation robustness

.added support for "Fast Forward" and "Fast Rewind" CDD commands
.modified default length of simulated CD audio tracks
This commit is contained in:
EkeEke 2012-07-15 17:15:01 +02:00
parent 28775cc3aa
commit ae1416aad4
2 changed files with 114 additions and 39 deletions

View File

@ -74,6 +74,15 @@ static const uint16 lut_BCD_16[100] =
0x0900, 0x0901, 0x0902, 0x0903, 0x0904, 0x0905, 0x0906, 0x0907, 0x0908, 0x0909, 0x0900, 0x0901, 0x0902, 0x0903, 0x0904, 0x0905, 0x0906, 0x0907, 0x0908, 0x0909,
}; };
static const uint16 toc_snatcher[21] =
{
56014, 495, 10120, 20555, 1580, 5417, 12502, 16090, 6553, 9681,
8148, 20228, 8622, 6142, 5858, 1287, 7424, 3535, 31697, 2485,
31380
};
void cdd_init(void) void cdd_init(void)
{ {
} }
@ -126,33 +135,64 @@ void cdd_load(char *filename, int type_bin)
fseek(cdd.toc.tracks[0].fd, 0, SEEK_SET); fseek(cdd.toc.tracks[0].fd, 0, SEEK_SET);
/* initialize TOC */ /* initialize TOC */
/* TODO: add 2 seconds pause after data track ? */
cdd.toc.end = cdd.toc.tracks[0].end; cdd.toc.end = cdd.toc.tracks[0].end;
cdd.toc.last = 1; cdd.toc.last = 1;
/* TODO: add audio track support from BIN/CUE, ISO/WAV, MP3, OGG ? */ /* TODO: add audio track support from BIN/CUE, ISO/WAV, MP3, OGG ? */
/* Fake audio tracks if none found */ /* Simulated audio tracks if none found */
if (cdd.toc.last == 1) if (cdd.toc.last == 1)
{ {
/* default track duration (fix Snatcher intro) */ /* Some games require specific TOC infos */
int length = 4 * 60 * 75; if (strstr(rominfo.product,"T-95035") != NULL)
/* A-Rank Thunder Tanjouen requires shorter track duration to pass intro */
if (strstr(rominfo.product,"T-49064") != NULL)
{ {
length = 2 * 75; /* Snatcher */
do
{
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end + 2*75;
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_snatcher[cdd.toc.last];
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
cdd.toc.last++;
}
while (cdd.toc.last < 21);
} }
else if (strstr(rominfo.product,"T-45074") != NULL)
/* max length = 60:02:00 */
do
{ {
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end; /* Lunar - Eternal Blue (J) */
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.end + length; cdd.toc.tracks[1].start = cdd.toc.end + 2*75;
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end; cdd.toc.tracks[1].end = cdd.toc.tracks[1].start + 21654;
cdd.toc.last++; cdd.toc.end = cdd.toc.tracks[1].end;
cdd.toc.tracks[2].start = cdd.toc.end + 2*75;
cdd.toc.tracks[2].end = cdd.toc.tracks[2].start + 5004;
cdd.toc.end = cdd.toc.tracks[2].end;
cdd.toc.tracks[3].start = cdd.toc.end + 2*75;
cdd.toc.tracks[3].end = cdd.toc.tracks[3].start + 684;
cdd.toc.end = cdd.toc.tracks[3].end;
cdd.toc.last = 4;
}
else if (strstr(rominfo.product,"T-127045") != NULL)
{
/* Lunar - Eternal Blue (U) */
cdd.toc.tracks[1].start = cdd.toc.end + 2*75;
cdd.toc.tracks[1].end = cdd.toc.tracks[1].start + 21735;
cdd.toc.end = cdd.toc.tracks[1].end;
cdd.toc.tracks[2].start = cdd.toc.end + 2*75;
cdd.toc.tracks[2].end = cdd.toc.tracks[2].start + 27131;
cdd.toc.end = cdd.toc.tracks[2].end;
cdd.toc.last = 3;
}
else
{
/* default TOC (99 x 2s) */
do
{
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end + 2*75;
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + 2*75;
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
cdd.toc.last++;
}
while ((cdd.toc.last < 99) && (cdd.toc.end < 56*60*75));
} }
while (cdd.toc.last <= 54);
} }
/* CD loaded */ /* CD loaded */
@ -175,15 +215,15 @@ void cdd_unload(void)
} }
} }
/* reset TOC */
memset(&cdd.toc, 0x00, sizeof(cdd.toc));
/* CD unloaded */ /* CD unloaded */
cdd.loaded = 0; cdd.loaded = 0;
/* unknown CD image file format */
cdd.sectorSize = 0;
} }
/* reset TOC */
memset(&cdd.toc, 0x00, sizeof(cdd.toc));
/* unknown CD image file format */
cdd.sectorSize = 0;
} }
void cdd_read(uint8 *dst) void cdd_read(uint8 *dst)
@ -219,19 +259,22 @@ void cdd_update(void)
} }
/* track type */ /* track type */
if (cdd.index) if (cdd.index > 0)
{ {
/* audio track sector is sent to CD Fader/DAC but also CDD */ if (cdd.index < cdd.toc.last)
cdc_decoder_update(0);
/* next audio track sector is automatically read */
cdd.lba++;
/* check end of current track */
if (cdd.lba >= cdd.toc.tracks[cdd.index].end)
{ {
/* next track */ /* audio track sector sent to CD Fader/DAC should also be sent to CDD */
cdd.index++; cdc_decoder_update(0);
/* next sector is automatically read */
cdd.lba++;
/* check end of current track */
if (cdd.lba >= cdd.toc.tracks[cdd.index].end)
{
/* next track */
cdd.index++;
}
} }
} }
else else
@ -249,7 +292,36 @@ void cdd_update(void)
} }
} }
/* TODO: handle FAST_FW & FAST_RW commands */ /* fast scanning disc */
else if (cdd.status == CD_SCAN)
{
/* skip track */
cdd.lba += cdd.scanOffset;
/* check current track limits */
if (cdd.lba >= cdd.toc.tracks[cdd.index].end)
{
/* next track */
cdd.index++;
}
else if (cdd.lba < cdd.toc.tracks[cdd.index].start)
{
/* previous track */
cdd.index--;
}
/* check disc limits */
if (cdd.index < 0)
{
cdd.index = 0;
cdd.lba = 0;
}
else if (cdd.index >= cdd.toc.last)
{
cdd.index = cdd.toc.last;
cdd.lba = cdd.toc.end;
}
}
} }
void cdd_process(void) void cdd_process(void)
@ -303,7 +375,7 @@ void cdd_process(void)
case 0x02: /* Current track */ case 0x02: /* Current track */
{ {
scd.regs[0x38>>1].w = (cdd.status << 8) | 0x02; scd.regs[0x38>>1].w = (cdd.status << 8) | 0x02;
scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index + 1]; scd.regs[0x3a>>1].w = (cdd.index < cdd.toc.last) ? lut_BCD_16[cdd.index + 1] : 0x0A0A;
scd.regs[0x3c>>1].w = 0x0000; scd.regs[0x3c>>1].w = 0x0000;
scd.regs[0x3e>>1].w = 0x0000; scd.regs[0x3e>>1].w = 0x0000;
scd.regs[0x40>>1].byte.h = 0x00; scd.regs[0x40>>1].byte.h = 0x00;
@ -383,7 +455,7 @@ void cdd_process(void)
cdd.lba = lba; cdd.lba = lba;
/* update current track index */ /* update current track index */
while (cdd.toc.tracks[index].end <= lba) index++; while ((cdd.toc.tracks[index].end <= lba) && (index < cdd.toc.last)) index++;
cdd.index = index; cdd.index = index;
/* track type */ /* track type */
@ -405,7 +477,7 @@ void cdd_process(void)
/* update status */ /* update status */
cdd.status = CD_PLAY; cdd.status = CD_PLAY;
scd.regs[0x38>>1].w = (CD_PLAY << 8) | 0x02; scd.regs[0x38>>1].w = (CD_PLAY << 8) | 0x02;
scd.regs[0x3a>>1].w = lut_BCD_16[index + 1]; scd.regs[0x3a>>1].w = (cdd.index < cdd.toc.last) ? lut_BCD_16[index + 1] : 0x0A0A;
scd.regs[0x3c>>1].w = 0x0000; scd.regs[0x3c>>1].w = 0x0000;
scd.regs[0x3e>>1].w = 0x0000; scd.regs[0x3e>>1].w = 0x0000;
scd.regs[0x40>>1].byte.h = 0x00; scd.regs[0x40>>1].byte.h = 0x00;
@ -426,7 +498,7 @@ void cdd_process(void)
cdd.lba = lba; cdd.lba = lba;
/* update current track index */ /* update current track index */
while (cdd.toc.tracks[index].end <= lba) index++; while ((cdd.toc.tracks[index].end <= lba) && (index < cdd.toc.last)) index++;
cdd.index = index; cdd.index = index;
/* DATA track */ /* DATA track */
@ -482,7 +554,7 @@ void cdd_process(void)
/* update status */ /* update status */
cdd.status = CD_PLAY; cdd.status = CD_PLAY;
scd.regs[0x38>>1].w = (CD_PLAY << 8) | 0x02; scd.regs[0x38>>1].w = (CD_PLAY << 8) | 0x02;
scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index+1]; scd.regs[0x3a>>1].w = (cdd.index < cdd.toc.last) ? lut_BCD_16[cdd.index + 1] : 0x0A0A;
scd.regs[0x3c>>1].w = 0x0000; scd.regs[0x3c>>1].w = 0x0000;
scd.regs[0x3e>>1].w = 0x0000; scd.regs[0x3e>>1].w = 0x0000;
scd.regs[0x40>>1].byte.h = 0x00; scd.regs[0x40>>1].byte.h = 0x00;
@ -491,6 +563,7 @@ void cdd_process(void)
case 0x08: /* Forward Scan */ case 0x08: /* Forward Scan */
{ {
cdd.scanOffset = 10;
cdd.status = CD_SCAN; cdd.status = CD_SCAN;
scd.regs[0x38>>1].w = (CD_SCAN << 8) | 0x02; scd.regs[0x38>>1].w = (CD_SCAN << 8) | 0x02;
scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index+1]; scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index+1];
@ -502,6 +575,7 @@ void cdd_process(void)
case 0x09: /* Rewind Scan */ case 0x09: /* Rewind Scan */
{ {
cdd.scanOffset = -10;
cdd.status = CD_SCAN; cdd.status = CD_SCAN;
scd.regs[0x38>>1].w = (CD_SCAN << 8) | 0x02; scd.regs[0x38>>1].w = (CD_SCAN << 8) | 0x02;
scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index+1]; scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index+1];

View File

@ -67,6 +67,7 @@ typedef struct
int loaded; int loaded;
int index; int index;
int lba; int lba;
int scanOffset;
uint8 status; uint8 status;
uint16 sectorSize; uint16 sectorSize;
toc_t toc; toc_t toc;