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https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-28 04:01:48 +01:00
.improved CDD TOC emulation robustness
.added support for "Fast Forward" and "Fast Rewind" CDD commands .modified default length of simulated CD audio tracks
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EkeEke
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28775cc3aa
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ae1416aad4
@ -74,6 +74,15 @@ static const uint16 lut_BCD_16[100] =
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0x0900, 0x0901, 0x0902, 0x0903, 0x0904, 0x0905, 0x0906, 0x0907, 0x0908, 0x0909,
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};
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static const uint16 toc_snatcher[21] =
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{
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56014, 495, 10120, 20555, 1580, 5417, 12502, 16090, 6553, 9681,
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8148, 20228, 8622, 6142, 5858, 1287, 7424, 3535, 31697, 2485,
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31380
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};
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void cdd_init(void)
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{
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}
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@ -126,33 +135,64 @@ void cdd_load(char *filename, int type_bin)
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fseek(cdd.toc.tracks[0].fd, 0, SEEK_SET);
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/* initialize TOC */
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/* TODO: add 2 seconds pause after data track ? */
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cdd.toc.end = cdd.toc.tracks[0].end;
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cdd.toc.last = 1;
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/* TODO: add audio track support from BIN/CUE, ISO/WAV, MP3, OGG ? */
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/* Fake audio tracks if none found */
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/* Simulated audio tracks if none found */
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if (cdd.toc.last == 1)
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{
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/* default track duration (fix Snatcher intro) */
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int length = 4 * 60 * 75;
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/* A-Rank Thunder Tanjouen requires shorter track duration to pass intro */
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if (strstr(rominfo.product,"T-49064") != NULL)
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/* Some games require specific TOC infos */
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if (strstr(rominfo.product,"T-95035") != NULL)
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{
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length = 2 * 75;
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/* Snatcher */
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do
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{
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cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end + 2*75;
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cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_snatcher[cdd.toc.last];
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cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
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cdd.toc.last++;
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}
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while (cdd.toc.last < 21);
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}
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/* max length = 60:02:00 */
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do
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else if (strstr(rominfo.product,"T-45074") != NULL)
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{
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cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
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cdd.toc.tracks[cdd.toc.last].end = cdd.toc.end + length;
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cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
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cdd.toc.last++;
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/* Lunar - Eternal Blue (J) */
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cdd.toc.tracks[1].start = cdd.toc.end + 2*75;
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cdd.toc.tracks[1].end = cdd.toc.tracks[1].start + 21654;
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cdd.toc.end = cdd.toc.tracks[1].end;
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cdd.toc.tracks[2].start = cdd.toc.end + 2*75;
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cdd.toc.tracks[2].end = cdd.toc.tracks[2].start + 5004;
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cdd.toc.end = cdd.toc.tracks[2].end;
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cdd.toc.tracks[3].start = cdd.toc.end + 2*75;
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cdd.toc.tracks[3].end = cdd.toc.tracks[3].start + 684;
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cdd.toc.end = cdd.toc.tracks[3].end;
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cdd.toc.last = 4;
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}
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else if (strstr(rominfo.product,"T-127045") != NULL)
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{
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/* Lunar - Eternal Blue (U) */
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cdd.toc.tracks[1].start = cdd.toc.end + 2*75;
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cdd.toc.tracks[1].end = cdd.toc.tracks[1].start + 21735;
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cdd.toc.end = cdd.toc.tracks[1].end;
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cdd.toc.tracks[2].start = cdd.toc.end + 2*75;
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cdd.toc.tracks[2].end = cdd.toc.tracks[2].start + 27131;
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cdd.toc.end = cdd.toc.tracks[2].end;
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cdd.toc.last = 3;
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}
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else
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{
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/* default TOC (99 x 2s) */
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do
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{
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cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end + 2*75;
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cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + 2*75;
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cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
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cdd.toc.last++;
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}
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while ((cdd.toc.last < 99) && (cdd.toc.end < 56*60*75));
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}
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while (cdd.toc.last <= 54);
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}
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/* CD loaded */
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@ -175,15 +215,15 @@ void cdd_unload(void)
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}
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}
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/* reset TOC */
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memset(&cdd.toc, 0x00, sizeof(cdd.toc));
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/* CD unloaded */
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cdd.loaded = 0;
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/* unknown CD image file format */
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cdd.sectorSize = 0;
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}
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/* reset TOC */
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memset(&cdd.toc, 0x00, sizeof(cdd.toc));
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/* unknown CD image file format */
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cdd.sectorSize = 0;
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}
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void cdd_read(uint8 *dst)
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@ -219,19 +259,22 @@ void cdd_update(void)
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}
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/* track type */
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if (cdd.index)
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if (cdd.index > 0)
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{
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/* audio track sector is sent to CD Fader/DAC but also CDD */
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cdc_decoder_update(0);
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/* next audio track sector is automatically read */
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cdd.lba++;
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/* check end of current track */
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if (cdd.lba >= cdd.toc.tracks[cdd.index].end)
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if (cdd.index < cdd.toc.last)
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{
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/* next track */
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cdd.index++;
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/* audio track sector sent to CD Fader/DAC should also be sent to CDD */
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cdc_decoder_update(0);
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/* next sector is automatically read */
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cdd.lba++;
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/* check end of current track */
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if (cdd.lba >= cdd.toc.tracks[cdd.index].end)
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{
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/* next track */
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cdd.index++;
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}
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}
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}
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else
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@ -249,7 +292,36 @@ void cdd_update(void)
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}
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}
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/* TODO: handle FAST_FW & FAST_RW commands */
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/* fast scanning disc */
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else if (cdd.status == CD_SCAN)
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{
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/* skip track */
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cdd.lba += cdd.scanOffset;
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/* check current track limits */
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if (cdd.lba >= cdd.toc.tracks[cdd.index].end)
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{
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/* next track */
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cdd.index++;
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}
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else if (cdd.lba < cdd.toc.tracks[cdd.index].start)
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{
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/* previous track */
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cdd.index--;
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}
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/* check disc limits */
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if (cdd.index < 0)
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{
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cdd.index = 0;
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cdd.lba = 0;
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}
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else if (cdd.index >= cdd.toc.last)
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{
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cdd.index = cdd.toc.last;
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cdd.lba = cdd.toc.end;
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}
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}
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}
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void cdd_process(void)
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@ -303,7 +375,7 @@ void cdd_process(void)
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case 0x02: /* Current track */
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{
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scd.regs[0x38>>1].w = (cdd.status << 8) | 0x02;
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scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index + 1];
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scd.regs[0x3a>>1].w = (cdd.index < cdd.toc.last) ? lut_BCD_16[cdd.index + 1] : 0x0A0A;
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scd.regs[0x3c>>1].w = 0x0000;
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scd.regs[0x3e>>1].w = 0x0000;
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scd.regs[0x40>>1].byte.h = 0x00;
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@ -383,7 +455,7 @@ void cdd_process(void)
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cdd.lba = lba;
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/* update current track index */
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while (cdd.toc.tracks[index].end <= lba) index++;
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while ((cdd.toc.tracks[index].end <= lba) && (index < cdd.toc.last)) index++;
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cdd.index = index;
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/* track type */
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@ -405,7 +477,7 @@ void cdd_process(void)
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/* update status */
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cdd.status = CD_PLAY;
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scd.regs[0x38>>1].w = (CD_PLAY << 8) | 0x02;
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scd.regs[0x3a>>1].w = lut_BCD_16[index + 1];
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scd.regs[0x3a>>1].w = (cdd.index < cdd.toc.last) ? lut_BCD_16[index + 1] : 0x0A0A;
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scd.regs[0x3c>>1].w = 0x0000;
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scd.regs[0x3e>>1].w = 0x0000;
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scd.regs[0x40>>1].byte.h = 0x00;
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@ -426,7 +498,7 @@ void cdd_process(void)
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cdd.lba = lba;
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/* update current track index */
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while (cdd.toc.tracks[index].end <= lba) index++;
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while ((cdd.toc.tracks[index].end <= lba) && (index < cdd.toc.last)) index++;
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cdd.index = index;
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/* DATA track */
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@ -482,7 +554,7 @@ void cdd_process(void)
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/* update status */
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cdd.status = CD_PLAY;
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scd.regs[0x38>>1].w = (CD_PLAY << 8) | 0x02;
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scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index+1];
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scd.regs[0x3a>>1].w = (cdd.index < cdd.toc.last) ? lut_BCD_16[cdd.index + 1] : 0x0A0A;
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scd.regs[0x3c>>1].w = 0x0000;
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scd.regs[0x3e>>1].w = 0x0000;
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scd.regs[0x40>>1].byte.h = 0x00;
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@ -491,6 +563,7 @@ void cdd_process(void)
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case 0x08: /* Forward Scan */
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{
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cdd.scanOffset = 10;
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cdd.status = CD_SCAN;
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scd.regs[0x38>>1].w = (CD_SCAN << 8) | 0x02;
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scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index+1];
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@ -502,6 +575,7 @@ void cdd_process(void)
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case 0x09: /* Rewind Scan */
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{
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cdd.scanOffset = -10;
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cdd.status = CD_SCAN;
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scd.regs[0x38>>1].w = (CD_SCAN << 8) | 0x02;
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scd.regs[0x3a>>1].w = lut_BCD_16[cdd.index+1];
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@ -67,6 +67,7 @@ typedef struct
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int loaded;
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int index;
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int lba;
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int scanOffset;
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uint8 status;
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uint16 sectorSize;
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toc_t toc;
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