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Genesis-Plus-GX/core/cd_hw/cdd.c

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/***************************************************************************************
* Genesis Plus
* CD drive processor & CD-DA fader
*
* Copyright (C) 2012-2014 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
*
* - Redistributions may not be sold, nor may they be used in a commercial
* product or activity.
*
* - Redistributions that are modified from the original source must include the
* complete source code, including the source code for all components used by a
* binary built from the modified sources. However, as a special exception, the
* source code distributed need not include anything that is normally distributed
* (in either source or binary form) with the major components (compiler, kernel,
* and so on) of the operating system on which the executable runs, unless that
* component itself accompanies the executable.
*
* - Redistributions must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************************/
#include "shared.h"
#ifdef USE_LIBTREMOR
#define SUPPORTED_EXT 20
#else
#define SUPPORTED_EXT 10
#endif
/* BCD conversion lookup tables */
static const uint8 lut_BCD_8[100] =
{
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
};
static const uint16 lut_BCD_16[100] =
{
0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009,
0x0100, 0x0101, 0x0102, 0x0103, 0x0104, 0x0105, 0x0106, 0x0107, 0x0108, 0x0109,
0x0200, 0x0201, 0x0202, 0x0203, 0x0204, 0x0205, 0x0206, 0x0207, 0x0208, 0x0209,
0x0300, 0x0301, 0x0302, 0x0303, 0x0304, 0x0305, 0x0306, 0x0307, 0x0308, 0x0309,
0x0400, 0x0401, 0x0402, 0x0403, 0x0404, 0x0405, 0x0406, 0x0407, 0x0408, 0x0409,
0x0500, 0x0501, 0x0502, 0x0503, 0x0504, 0x0505, 0x0506, 0x0507, 0x0508, 0x0509,
0x0600, 0x0601, 0x0602, 0x0603, 0x0604, 0x0605, 0x0606, 0x0607, 0x0608, 0x0609,
0x0700, 0x0701, 0x0702, 0x0703, 0x0704, 0x0705, 0x0706, 0x0707, 0x0708, 0x0709,
0x0800, 0x0801, 0x0802, 0x0803, 0x0804, 0x0805, 0x0806, 0x0807, 0x0808, 0x0809,
0x0900, 0x0901, 0x0902, 0x0903, 0x0904, 0x0905, 0x0906, 0x0907, 0x0908, 0x0909,
};
/* pre-build TOC */
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
};
static const uint16 toc_lunar[52] =
{
5422, 1057, 7932, 5401, 6380, 6592, 5862, 5937, 5478, 5870,
6673, 6613, 6429, 4996, 4977, 5657, 3720, 5892, 3140, 3263,
6351, 5187, 3249, 1464, 1596, 1750, 1751, 6599, 4578, 5205,
1550, 1827, 2328, 1346, 1569, 1613, 7199, 4928, 1656, 2549,
1875, 3901, 1850, 2399, 2028, 1724, 4889, 14551, 1184, 2132,
685, 3167
};
static const uint32 toc_shadow[15] =
{
10226, 70054, 11100, 12532, 12444, 11923, 10059, 10167, 10138, 13792,
11637, 2547, 2521, 3856, 900
};
static const uint32 toc_dungeon[13] =
{
2250, 22950, 16350, 24900, 13875, 19950, 13800, 15375, 17400, 17100,
3325, 6825, 25275
};
static const uint32 toc_ffight[26] =
{
11994, 9742, 10136, 9685, 9553, 14588, 9430, 8721, 9975, 9764,
9704, 12796, 585, 754, 951, 624, 9047, 1068, 817, 9191, 1024,
14562, 10320, 8627, 3795, 3047
};
static const uint32 toc_ffightj[29] =
{
11994, 9752, 10119, 9690, 9567, 14575, 9431, 8731, 9965, 9763,
9716, 12791, 579, 751, 958, 630, 9050, 1052, 825, 9193, 1026,
14553, 9834, 10542, 1699, 1792, 1781, 3783, 3052
};
/* supported WAVE file header (16-bit stereo samples @44.1kHz) */
static const unsigned char waveHeader[32] =
{
0x57,0x41,0x56,0x45,0x66,0x6d,0x74,0x20,0x10,0x00,0x00,0x00,0x01,0x00,0x02,0x00,
0x44,0xac,0x00,0x00,0x10,0xb1,0x02,0x00,0x04,0x00,0x10,0x00,0x64,0x61,0x74,0x61
};
/* supported WAVE file extensions */
static const char extensions[SUPPORTED_EXT][16] =
{
#ifdef USE_LIBTREMOR
"%02d.ogg",
" %02d.ogg",
"-%02d.ogg",
"_%02d.ogg",
" - %02d.ogg",
"%d.ogg",
" %d.ogg",
"-%d.ogg",
"_%d.ogg",
" - %d.ogg",
#endif
"%02d.wav",
" %02d.wav",
"-%02d.wav",
"_%02d.wav",
" - %02d.wav",
"%d.wav",
" %d.wav",
"-%d.wav",
"_%d.wav",
" - %d.wav"
};
#ifdef USE_LIBTREMOR
#ifdef DISABLE_MANY_OGG_OPEN_FILES
static void ogg_free(int i)
{
/* clear OGG file descriptor to prevent file from being closed */
cdd.toc.tracks[i].vf.datasource = NULL;
/* close VORBIS file structure */
ov_clear(&cdd.toc.tracks[i].vf);
/* indicates that the track is a seekable VORBIS file */
cdd.toc.tracks[i].vf.seekable = 1;
/* reset file reading position */
fseek(cdd.toc.tracks[i].fd, 0, SEEK_SET);
}
#endif
#endif
void cdd_init(int samplerate)
{
/* CD-DA is running by default at 44100 Hz */
/* Audio stream is resampled to desired rate using Blip Buffer */
blip_set_rates(snd.blips[2][0], 44100, samplerate);
blip_set_rates(snd.blips[2][1], 44100, samplerate);
}
void cdd_reset(void)
{
/* reset cycle counter */
cdd.cycles = 0;
/* reset drive access latency */
cdd.latency = 0;
/* reset track index */
cdd.index = 0;
/* reset logical block address */
cdd.lba = 0;
/* reset status */
cdd.status = cdd.loaded ? CD_STOP : NO_DISC;
/* reset CD-DA fader (full volume) */
cdd.volume = 0x400;
/* clear CD-DA output */
cdd.audio[0] = cdd.audio[1] = 0;
}
int cdd_context_save(uint8 *state)
{
int bufferptr = 0;
save_param(&cdd.cycles, sizeof(cdd.cycles));
save_param(&cdd.latency, sizeof(cdd.latency));
save_param(&cdd.index, sizeof(cdd.index));
save_param(&cdd.lba, sizeof(cdd.lba));
save_param(&cdd.scanOffset, sizeof(cdd.scanOffset));
save_param(&cdd.volume, sizeof(cdd.volume));
save_param(&cdd.status, sizeof(cdd.status));
return bufferptr;
}
int cdd_context_load(uint8 *state)
{
int lba;
int bufferptr = 0;
#ifdef USE_LIBTREMOR
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* close previous track VORBIS file structure to save memory */
if (cdd.toc.tracks[cdd.index].vf.datasource)
{
ogg_free(cdd.index);
}
#endif
#endif
load_param(&cdd.cycles, sizeof(cdd.cycles));
load_param(&cdd.latency, sizeof(cdd.latency));
load_param(&cdd.index, sizeof(cdd.index));
load_param(&cdd.lba, sizeof(cdd.lba));
load_param(&cdd.scanOffset, sizeof(cdd.scanOffset));
load_param(&cdd.volume, sizeof(cdd.volume));
load_param(&cdd.status, sizeof(cdd.status));
/* adjust current LBA within track limit */
lba = cdd.lba;
if (lba < cdd.toc.tracks[cdd.index].start)
{
lba = cdd.toc.tracks[cdd.index].start;
}
/* seek to current track position */
if (!cdd.index)
{
/* DATA track */
if (cdd.toc.tracks[0].fd)
{
fseek(cdd.toc.tracks[0].fd, lba * cdd.sectorSize, SEEK_SET);
}
}
#ifdef USE_LIBTREMOR
else if (cdd.toc.tracks[cdd.index].vf.seekable)
{
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* VORBIS file need to be opened first */
ov_open(cdd.toc.tracks[cdd.index].fd,&cdd.toc.tracks[cdd.index].vf,0,0);
#endif
/* VORBIS AUDIO track */
ov_pcm_seek(&cdd.toc.tracks[cdd.index].vf, (lba - cdd.toc.tracks[cdd.index].start) * 588 - cdd.toc.tracks[cdd.index].offset);
}
#endif
else if (cdd.toc.tracks[cdd.index].fd)
{
/* PCM AUDIO track */
fseek(cdd.toc.tracks[cdd.index].fd, (lba * 2352) - cdd.toc.tracks[cdd.index].offset, SEEK_SET);
}
return bufferptr;
}
int cdd_load(char *filename, char *header)
{
char fname[256];
char line[128];
char *ptr = 0;
char *lptr = 0;
FILE *fd;
/* first unmount any loaded disc */
cdd_unload();
/* open file */
fd = fopen(filename, "rb");
/* save a copy of base filename */
strncpy(fname, filename, 256);
/* autodetect .cue file */
if (!memcmp(".cue", &filename[strlen(filename) - 4], 4) || !memcmp(".CUE", &filename[strlen(filename) - 4], 4))
{
if (fd)
{
/* find first FILE command */
while (!lptr)
{
if (fgets(line, 128, fd) == NULL)
{
break;
}
lptr = strstr(line, "FILE");
}
/* get BINARY file name */
if (lptr && strstr(line, " BINARY"))
{
/* skip "FILE" attribute */
lptr += 4;
/* skip DOUBLE QUOTE or SPACE characters */
while ((*lptr == 0x20) || (*lptr == '\"')) lptr++;
/* set pointer at the end of filepath */
ptr = fname + strlen(fname) - 1;
while ((ptr - fname) && (*ptr != '/') && (*ptr != '\\')) ptr--;
if (ptr - fname) ptr++;
/* append filename characters after filepath */
while ((*lptr != '\"') && memcmp(lptr, " BINARY", 7) && (ptr < (fname + 255)))
{
*ptr++ = *lptr++;
}
*ptr = 0;
/* open file & initialize DATA track file descriptor */
cdd.toc.tracks[0].fd = fopen(fname, "rb");
}
else
{
/* close .cue file */
fclose(fd);
/* invalid .cue file */
return -1;
}
}
}
else
{
/* initialize DATA track file descriptor */
cdd.toc.tracks[0].fd = fd;
/* automatically try to open associated .cue file */
strncpy(&fname[strlen(fname) - 4], ".cue", 4);
fd = fopen(fname, "rb");
}
if (!cdd.toc.tracks[0].fd)
{
/* close any opened .cue file */
if (fd) fclose(fd);
/* error opening file */
return -1;
}
/* read first 16 bytes */
fread(header, 0x10, 1, cdd.toc.tracks[0].fd);
/* look for valid CD image ID string */
if (memcmp("SEGADISCSYSTEM", header, 14))
{
/* if not found, read next 16 bytes */
fread(header, 0x10, 1, cdd.toc.tracks[0].fd);
/* look again for valid CD image ID string */
if (memcmp("SEGADISCSYSTEM", header, 14))
{
/* close any opened .cue file */
if (fd) fclose(fd);
/* close binary file */
fclose(cdd.toc.tracks[0].fd);
cdd.toc.tracks[0].fd = 0;
/* not a CD image file */
return 0;
}
/* BIN format (2352 bytes data blocks) */
cdd.sectorSize = 2352;
}
else
{
/* ISO format (2048 bytes data blocks) */
cdd.sectorSize = 2048;
}
/* read CD image header + security code */
fread(header + 0x10, 0x200, 1, cdd.toc.tracks[0].fd);
/* DATA track start time (based on DATA file length) */
fseek(cdd.toc.tracks[0].fd, 0, SEEK_END);
cdd.toc.tracks[0].end = ftell(cdd.toc.tracks[0].fd) / cdd.sectorSize;
/* DATA track start time (logical block 0) */
fseek(cdd.toc.tracks[0].fd, 0, SEEK_SET);
cdd.toc.tracks[0].start = 0;
/* initialize TOC */
cdd.toc.end = cdd.toc.tracks[0].end;
cdd.toc.last = 1;
/* automatically retrieve audio tracks infos from .cue file */
if (fd)
{
int pregap = 0;
int mm, ss, bb;
/* skip first (DATA) track */
while (!strstr(line, "INDEX 01") && !strstr(line, "INDEX 1"))
{
if (fgets(line, 128, fd) == NULL)
{
break;
}
}
/* read next lines until end of file */
while (fgets(line, 128, fd) != NULL)
{
/* skip any SPACE characters */
lptr = line;
while (*lptr == 0x20) lptr++;
/* decode FILE commands */
if (!(memcmp(lptr, "FILE", 4)))
{
/* skip "FILE" attribute */
lptr += 4;
/* skip DOUBLE QUOTE or SPACE characters */
while ((*lptr == 0x20) || (*lptr == '\"')) lptr++;
/* set pointer at the end of filepath */
ptr = fname + strlen(fname) - 1;
while ((ptr - fname) && (*ptr != '/') && (*ptr != '\\')) ptr--;
if (ptr - fname) ptr++;
/* append filename characters after filepath */
while ((*lptr != '\"') && (lptr <= (line + 128)) && (ptr < (fname + 255)))
{
*ptr++ = *lptr++;
}
*ptr = 0;
/* open file & initialize track file descriptor */
cdd.toc.tracks[cdd.toc.last].fd = fopen(fname, "rb");
if (!cdd.toc.tracks[cdd.toc.last].fd)
{
/* error opening file */
break;
}
/* reset current file PREGAP length */
pregap = 0;
/* reset current file read offset */
cdd.toc.tracks[cdd.toc.last].offset = 0;
/* check supported file types */
if (!strstr(lptr,"BINARY"))
{
/* read file header */
unsigned char head[32];
fseek(cdd.toc.tracks[cdd.toc.last].fd, 8, SEEK_SET);
fread(head, 32, 1, cdd.toc.tracks[cdd.toc.last].fd);
fseek(cdd.toc.tracks[cdd.toc.last].fd, 0, SEEK_SET);
/* autodetect WAVE file header (16-bit stereo @44.1kHz only) */
if (!memcmp(head, waveHeader, 32))
{
/* adjust current track file read offset with WAVE header length */
cdd.toc.tracks[cdd.toc.last].offset -= 44;
}
#ifdef USE_LIBTREMOR
else if (!ov_open(cdd.toc.tracks[cdd.toc.last].fd,&cdd.toc.tracks[cdd.toc.last].vf,0,0))
{
/* retrieve stream infos */
vorbis_info *info = ov_info(&cdd.toc.tracks[cdd.toc.last].vf,-1);
if (!info || (info->rate != 44100) || (info->channels != 2))
{
/* unsupported VORBIS file format (stereo @44.1kHz only) */
ov_clear(&cdd.toc.tracks[cdd.toc.last].vf);
cdd.toc.tracks[cdd.toc.last].fd = 0;
break;
}
}
#endif
else
{
/* unsupported audio file */
fclose(cdd.toc.tracks[cdd.toc.last].fd);
cdd.toc.tracks[cdd.toc.last].fd = 0;
break;
}
}
}
/* decode TRACK commands */
else if ((sscanf(lptr, "TRACK %02d AUDIO", &bb)) || (sscanf(lptr, "TRACK %d AUDIO", &bb)))
{
/* check track number */
if (bb != (cdd.toc.last + 1))
{
/* close any opened file */
if (cdd.toc.tracks[cdd.toc.last].fd)
{
fclose(cdd.toc.tracks[cdd.toc.last].fd);
cdd.toc.tracks[cdd.toc.last].fd = 0;
}
/* missing tracks */
break;
}
/* check if a single file is used for all tracks */
if (!cdd.toc.tracks[cdd.toc.last].fd)
{
/* clear previous track end time */
cdd.toc.tracks[cdd.toc.last - 1].end = 0;
}
}
/* decode PREGAP commands */
else if (sscanf(lptr, "PREGAP %02d:%02d:%02d", &mm, &ss, &bb) == 3)
{
/* increment current file PREGAP length */
pregap += bb + ss*75 + mm*60*75;
}
/* decode INDEX commands */
else if ((sscanf(lptr, "INDEX 00 %02d:%02d:%02d", &mm, &ss, &bb) == 3) ||
(sscanf(lptr, "INDEX 0 %02d:%02d:%02d", &mm, &ss, &bb) == 3))
{
/* check if a single file is used for all tracks */
if (!cdd.toc.tracks[cdd.toc.last].fd)
{
/* set previous track end time */
cdd.toc.tracks[cdd.toc.last - 1].end = bb + ss*75 + mm*60*75 + pregap;
}
}
else if ((sscanf(lptr, "INDEX 01 %02d:%02d:%02d", &mm, &ss, &bb) == 3) ||
(sscanf(lptr, "INDEX 1 %02d:%02d:%02d", &mm, &ss, &bb) == 3))
{
/* adjust file read offset for current track with current file PREGAP length */
cdd.toc.tracks[cdd.toc.last].offset += pregap * 2352;
/* check if a single file is used for all tracks */
if (!cdd.toc.tracks[cdd.toc.last].fd)
{
/* use common file descriptor */
cdd.toc.tracks[cdd.toc.last].fd = cdd.toc.tracks[0].fd;
/* current track start time (based on current absolute time) */
cdd.toc.tracks[cdd.toc.last].start = bb + ss*75 + mm*60*75 + pregap;
/* check if previous track end time has not been already set (through INDEX00 command) */
if (cdd.toc.tracks[cdd.toc.last - 1].end == 0)
{
/* set previous track end time (based on current absolute timee) */
cdd.toc.tracks[cdd.toc.last - 1].end = bb + ss*75 + mm*60*75;
}
}
else
{
/* current track start time (based on previous track end time) */
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end + bb + ss*75 + mm*60*75 + pregap;
/* adjust file read offset with previous track end time */
cdd.toc.tracks[cdd.toc.last].offset += cdd.toc.end * 2352;
#ifdef USE_LIBTREMOR
if (cdd.toc.tracks[cdd.toc.last].vf.datasource)
{
/* convert read offset to PCM sample offset */
cdd.toc.tracks[cdd.toc.last].offset = cdd.toc.tracks[cdd.toc.last].offset / 4;
/* current track end time */
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + ov_pcm_total(&cdd.toc.tracks[cdd.toc.last].vf,-1)/588;
if (cdd.toc.tracks[cdd.toc.last].end <= cdd.toc.tracks[cdd.toc.last].start)
{
/* invalid length */
ov_clear(&cdd.toc.tracks[cdd.toc.last].vf);
cdd.toc.tracks[cdd.toc.last].fd = 0;
cdd.toc.tracks[cdd.toc.last].end = 0;
cdd.toc.tracks[cdd.toc.last].start = 0;
cdd.toc.tracks[cdd.toc.last].offset = 0;
break;
}
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* close VORBIS file structure to save memory */
ogg_free(cdd.toc.last);
#endif
}
else
#endif
{
/* current track end time */
fseek(cdd.toc.tracks[cdd.toc.last].fd, 0, SEEK_END);
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + ((ftell(cdd.toc.tracks[cdd.toc.last].fd) + 2351) / 2352);
fseek(cdd.toc.tracks[cdd.toc.last].fd, 0, SEEK_SET);
}
/* update TOC end */
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
}
/* increment track number */
cdd.toc.last++;
}
}
/* check if a single file is used for all tracks */
if (cdd.toc.tracks[cdd.toc.last - 1].fd == cdd.toc.tracks[0].fd)
{
/* adjust TOC end */
cdd.toc.end += pregap;
/* last track end index */
cdd.toc.tracks[cdd.toc.last - 1].end = cdd.toc.end;
}
/* close .cue file */
fclose(fd);
}
/* .ISO audio tracks auto-detection */
else if (cdd.sectorSize == 2048)
{
int i, offset;
/* set pointer at the end of filename */
ptr = fname + strlen(fname) - 4;
/* auto-detect track file extensions */
for (i=0; i<SUPPORTED_EXT; i++)
{
/* auto-detect bad rips with wrong track indexes */
sprintf(ptr, extensions[i], 1);
fd = fopen(fname, "rb");
if (fd)
{
offset = 0;
break;
}
sprintf(ptr, extensions[i], 2);
fd = fopen(fname, "rb");
if (fd)
{
offset = 1;
break;
}
}
/* repeat until no more valid track files can be found */
while (fd)
{
/* read file HEADER */
unsigned char head[32];
fseek(fd, 8, SEEK_SET);
fread(head, 32, 1, fd);
fseek(fd, 0, SEEK_SET);
/* check if this is a valid WAVE file (16-bit stereo @44.1kHz only) */
if (!memcmp(head, waveHeader, 32))
{
/* initialize current track file descriptor */
cdd.toc.tracks[cdd.toc.last].fd = fd;
/* initialize current track start time (based on previous track end time) */
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
/* add default 2s PAUSE between tracks */
cdd.toc.tracks[cdd.toc.last].start += 150;
/* current track end time */
fseek(fd, 0, SEEK_END);
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + ((ftell(fd) + 2351) / 2352);
/* initialize file read offset for current track */
cdd.toc.tracks[cdd.toc.last].offset = cdd.toc.tracks[cdd.toc.last].start * 2352;
/* auto-detect PAUSE within audio files */
fseek(fd, 100 * 2352, SEEK_SET);
fread(head, 4, 1, fd);
fseek(fd, 0, SEEK_SET);
if (*(int32 *)head == 0)
{
/* assume 2s PAUSE is included at the beginning of the file */
cdd.toc.tracks[cdd.toc.last].offset -= 150 * 2352;
cdd.toc.tracks[cdd.toc.last].end -= 150;
}
/* update TOC end */
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
/* adjust file read offset for current track with WAVE header length */
cdd.toc.tracks[cdd.toc.last].offset -= 44;
/* increment track number */
cdd.toc.last++;
}
#ifdef USE_LIBTREMOR
else if (!ov_open(fd,&cdd.toc.tracks[cdd.toc.last].vf,0,0))
{
/* retrieve stream infos */
vorbis_info *info = ov_info(&cdd.toc.tracks[cdd.toc.last].vf,-1);
if (!info || (info->rate != 44100) || (info->channels != 2))
{
/* unsupported OGG file */
ov_clear(&cdd.toc.tracks[cdd.toc.last].vf);
break;
}
/* initialize current track file descriptor */
cdd.toc.tracks[cdd.toc.last].fd = fd;
/* initialize current track start time (based on previous track end time) */
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
/* add default 2s PAUSE between tracks */
cdd.toc.tracks[cdd.toc.last].start += 150;
/* current track end time */
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + ov_pcm_total(&cdd.toc.tracks[cdd.toc.last].vf,-1)/588;
if (cdd.toc.tracks[cdd.toc.last].end <= cdd.toc.tracks[cdd.toc.last].start)
{
/* invalid file length */
ov_clear(&cdd.toc.tracks[cdd.toc.last].vf);
cdd.toc.tracks[cdd.toc.last].fd = 0;
cdd.toc.tracks[cdd.toc.last].end = 0;
cdd.toc.tracks[cdd.toc.last].start = 0;
break;
}
/* auto-detect PAUSE within audio files */
ov_pcm_seek(&cdd.toc.tracks[cdd.toc.last].vf, 100 * 588);
ov_read(&cdd.toc.tracks[cdd.toc.last].vf, (char *)head, 32, 0);
ov_pcm_seek(&cdd.toc.tracks[cdd.toc.last].vf, 0);
if (*(int32 *)head == 0)
{
/* assume 2s PAUSE is included at the beginning of the file */
cdd.toc.tracks[cdd.toc.last].offset -= 150 * 588;
cdd.toc.tracks[cdd.toc.last].end -= 150;
}
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* close VORBIS file structure to save memory */
ogg_free(cdd.toc.last);
#endif
/* update TOC end */
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
/* increment track number */
cdd.toc.last++;
}
#endif
else
{
/* unsupported audio file format */
fclose(fd);
break;
}
/* try to open next audio track file */
sprintf(ptr, extensions[i], cdd.toc.last + offset);
fd = fopen(fname, "rb");
}
}
/* Simulate audio tracks if none found */
if (cdd.toc.last == 1)
{
/* Some games require exact TOC infos */
if (strstr(header + 0x180,"T-95035") != NULL)
{
/* Snatcher */
cdd.toc.last = cdd.toc.end = 0;
do
{
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
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(header + 0x180,"T-127015") != NULL)
{
/* Lunar - The Silver Star */
cdd.toc.last = cdd.toc.end = 0;
do
{
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_lunar[cdd.toc.last];
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
cdd.toc.last++;
}
while (cdd.toc.last < 52);
}
else if (strstr(header + 0x180,"T-113045") != NULL)
{
/* Shadow of the Beast II */
cdd.toc.last = cdd.toc.end = 0;
do
{
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_shadow[cdd.toc.last];
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
cdd.toc.last++;
}
while (cdd.toc.last < 15);
}
else if (strstr(header + 0x180,"T-143025") != NULL)
{
/* Dungeon Explorer */
cdd.toc.last = cdd.toc.end = 0;
do
{
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_dungeon[cdd.toc.last];
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
cdd.toc.last++;
}
while (cdd.toc.last < 13);
}
else if (strstr(header + 0x180,"MK-4410") != NULL)
{
/* Final Fight CD (USA, Europe) */
cdd.toc.last = cdd.toc.end = 0;
do
{
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_ffight[cdd.toc.last];
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
cdd.toc.last++;
}
while (cdd.toc.last < 26);
}
else if (strstr(header + 0x180,"G-6013") != NULL)
{
/* Final Fight CD (Japan) */
cdd.toc.last = cdd.toc.end = 0;
do
{
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_ffightj[cdd.toc.last];
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
cdd.toc.last++;
}
while (cdd.toc.last < 29);
}
else
{
/* default TOC (99 tracks & 2s per audio tracks) */
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));
}
}
/* Lead-out */
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
/* CD loaded */
cdd.loaded = 1;
return 1;
}
void cdd_unload(void)
{
if (cdd.loaded)
{
int i;
/* close CD tracks */
for (i=0; i<cdd.toc.last; i++)
{
#ifdef USE_LIBTREMOR
if (cdd.toc.tracks[i].vf.datasource)
{
/* close VORBIS file (if still opened) */
ov_clear(&cdd.toc.tracks[i].vf);
}
else
#endif
if (cdd.toc.tracks[i].fd)
{
/* close file */
fclose(cdd.toc.tracks[i].fd);
/* detect single file images */
if (cdd.toc.tracks[i+1].fd == cdd.toc.tracks[i].fd)
{
/* exit loop */
i = cdd.toc.last;
}
}
}
/* CD unloaded */
cdd.loaded = 0;
}
/* reset TOC */
memset(&cdd.toc, 0x00, sizeof(cdd.toc));
/* unknown CD image file format */
cdd.sectorSize = 0;
}
void cdd_read_data(uint8 *dst)
{
/* only read DATA track sectors */
if ((cdd.lba >= 0) && (cdd.lba < cdd.toc.tracks[0].end))
{
/* BIN format ? */
if (cdd.sectorSize == 2352)
{
/* skip 16-byte header */
fseek(cdd.toc.tracks[0].fd, cdd.lba * 2352 + 16, SEEK_SET);
}
/* read sector data (Mode 1 = 2048 bytes) */
fread(dst, 2048, 1, cdd.toc.tracks[0].fd);
}
}
void cdd_read_audio(unsigned int samples)
{
/* previous audio outputs */
int16 l = cdd.audio[0];
int16 r = cdd.audio[1];
/* get number of internal clocks (samples) needed */
samples = blip_clocks_needed(snd.blips[2][0], samples);
/* audio track playing ? */
if (!scd.regs[0x36>>1].byte.h && cdd.toc.tracks[cdd.index].fd)
{
int i, mul, delta;
/* current CD-DA fader volume */
int curVol = cdd.volume;
/* CD-DA fader volume setup (0-1024) */
int endVol = scd.regs[0x34>>1].w >> 4;
/* read samples from current block */
#ifdef USE_LIBTREMOR
if (cdd.toc.tracks[cdd.index].vf.datasource)
{
int len, done = 0;
int16 *ptr = (int16 *) (cdc.ram);
samples = samples * 4;
while (done < samples)
{
len = ov_read(&cdd.toc.tracks[cdd.index].vf, (char *)(cdc.ram + done), samples - done, 0);
if (len <= 0)
{
done = samples;
break;
}
done += len;
}
samples = done / 4;
/* process 16-bit (host-endian) stereo samples */
for (i=0; i<samples; i++)
{
/* CD-DA fader multiplier (cf. LC7883 datasheet) */
/* (MIN) 0,1,2,3,4,8,12,16,20...,1020,1024 (MAX) */
mul = (curVol & 0x7fc) ? (curVol & 0x7fc) : (curVol & 0x03);
/* left channel */
delta = ((ptr[0] * mul) / 1024) - l;
ptr++;
l += delta;
blip_add_delta_fast(snd.blips[2][0], i, delta);
/* right channel */
delta = ((ptr[0] * mul) / 1024) - r;
ptr++;
r += delta;
blip_add_delta_fast(snd.blips[2][1], i, delta);
/* update CD-DA fader volume (one step/sample) */
if (curVol < endVol)
{
/* fade-in */
curVol++;
}
else if (curVol > endVol)
{
/* fade-out */
curVol--;
}
else if (!curVol)
{
/* audio will remain muted until next setup */
break;
}
}
}
else
#endif
{
#ifdef LSB_FIRST
int16 *ptr = (int16 *) (cdc.ram);
#else
uint8 *ptr = cdc.ram;
#endif
fread(cdc.ram, 1, samples * 4, cdd.toc.tracks[cdd.index].fd);
/* process 16-bit (little-endian) stereo samples */
for (i=0; i<samples; i++)
{
/* CD-DA fader multiplier (cf. LC7883 datasheet) */
/* (MIN) 0,1,2,3,4,8,12,16,20...,1020,1024 (MAX) */
mul = (curVol & 0x7fc) ? (curVol & 0x7fc) : (curVol & 0x03);
/* left channel */
#ifdef LSB_FIRST
delta = ((ptr[0] * mul) / 1024) - l;
ptr++;
#else
delta = (((int16)((ptr[0] + ptr[1]*256)) * mul) / 1024) - l;
ptr += 2;
#endif
l += delta;
blip_add_delta_fast(snd.blips[2][0], i, delta);
/* right channel */
#ifdef LSB_FIRST
delta = ((ptr[0] * mul) / 1024) - r;
ptr++;
#else
delta = (((int16)((ptr[0] + ptr[1]*256)) * mul) / 1024) - r;
ptr += 2;
#endif
r += delta;
blip_add_delta_fast(snd.blips[2][1], i, delta);
/* update CD-DA fader volume (one step/sample) */
if (curVol < endVol)
{
/* fade-in */
curVol++;
}
else if (curVol > endVol)
{
/* fade-out */
curVol--;
}
else if (!curVol)
{
/* audio will remain muted until next setup */
break;
}
}
}
/* save current CD-DA fader volume */
cdd.volume = curVol;
/* save last audio output for next frame */
cdd.audio[0] = l;
cdd.audio[1] = r;
}
else
{
/* no audio output */
if (l) blip_add_delta_fast(snd.blips[2][0], 0, -l);
if (r) blip_add_delta_fast(snd.blips[2][1], 0, -r);
/* save audio output for next frame */
cdd.audio[0] = 0;
cdd.audio[1] = 0;
}
/* end of Blip Buffer timeframe */
blip_end_frame(snd.blips[2][0], samples);
blip_end_frame(snd.blips[2][1], samples);
}
void cdd_update(void)
{
#ifdef LOG_CDD
error("LBA = %d (track n<>%d)(latency=%d)\n", cdd.lba, cdd.index, cdd.latency);
#endif
/* seeking disc */
if (cdd.status == CD_SEEK)
{
/* drive latency */
if (cdd.latency > 0)
{
cdd.latency--;
return;
}
/* drive is ready */
cdd.status = CD_READY;
}
/* reading disc */
else if (cdd.status == CD_PLAY)
{
/* drive latency */
if (cdd.latency > 0)
{
cdd.latency--;
return;
}
/* track type */
if (!cdd.index)
{
/* DATA sector header (CD-ROM Mode 1) */
uint8 header[4];
uint32 msf = cdd.lba + 150;
header[0] = lut_BCD_8[(msf / 75) / 60];
header[1] = lut_BCD_8[(msf / 75) % 60];
header[2] = lut_BCD_8[(msf % 75)];
header[3] = 0x01;
/* data track sector read is controlled by CDC */
cdd.lba += cdc_decoder_update(*(uint32 *)(header));
}
else if (cdd.index < cdd.toc.last)
{
/* check against audio track start index */
if (cdd.lba >= cdd.toc.tracks[cdd.index].start)
{
/* audio track playing */
scd.regs[0x36>>1].byte.h = 0x00;
}
/* audio blocks are still sent to CDC as well as CD DAC/Fader */
cdc_decoder_update(0);
/* next audio block is automatically read */
cdd.lba++;
}
else
{
/* end of disc */
cdd.status = CD_END;
return;
}
/* check end of current track */
if (cdd.lba >= cdd.toc.tracks[cdd.index].end)
{
#ifdef USE_LIBTREMOR
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* close previous track VORBIS file structure to save memory */
if (cdd.toc.tracks[cdd.index].vf.datasource)
{
ogg_free(cdd.index);
}
#endif
#endif
/* play next track */
cdd.index++;
/* PAUSE between tracks */
scd.regs[0x36>>1].byte.h = 0x01;
/* seek to next audio track start */
#ifdef USE_LIBTREMOR
if (cdd.toc.tracks[cdd.index].vf.seekable)
{
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* VORBIS file need to be opened first */
ov_open(cdd.toc.tracks[cdd.index].fd,&cdd.toc.tracks[cdd.index].vf,0,0);
#endif
ov_pcm_seek(&cdd.toc.tracks[cdd.index].vf, -cdd.toc.tracks[cdd.index].offset);
}
else
#endif
if (cdd.toc.tracks[cdd.index].fd)
{
fseek(cdd.toc.tracks[cdd.index].fd, (cdd.toc.tracks[cdd.index].start * 2352) - cdd.toc.tracks[cdd.index].offset, SEEK_SET);
}
}
}
/* scanning disc */
else if (cdd.status == CD_SCAN)
{
/* fast-forward or fast-rewind */
cdd.lba += cdd.scanOffset;
/* check current track limits */
if (cdd.lba >= cdd.toc.tracks[cdd.index].end)
{
#ifdef USE_LIBTREMOR
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* close previous track VORBIS file structure to save memory */
if (cdd.toc.tracks[cdd.index].vf.datasource)
{
ogg_free(cdd.index);
}
#endif
#endif
/* next track */
cdd.index++;
/* skip directly to track start position */
cdd.lba = cdd.toc.tracks[cdd.index].start;
/* AUDIO track playing ? */
if (cdd.status == CD_PLAY)
{
scd.regs[0x36>>1].byte.h = 0x00;
}
}
else if (cdd.lba < cdd.toc.tracks[cdd.index].start)
{
#ifdef USE_LIBTREMOR
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* close previous track VORBIS file structure to save memory */
if (cdd.toc.tracks[cdd.index].vf.datasource)
{
ogg_free(cdd.index);
}
#endif
#endif
/* previous track */
cdd.index--;
/* skip directly to track end position */
cdd.lba = cdd.toc.tracks[cdd.index].end;
}
/* check disc limits */
if (cdd.index < 0)
{
cdd.index = 0;
cdd.lba = 0;
}
else if (cdd.index >= cdd.toc.last)
{
/* no AUDIO track playing */
scd.regs[0x36>>1].byte.h = 0x01;
/* end of disc */
cdd.index = cdd.toc.last;
cdd.lba = cdd.toc.end;
cdd.status = CD_END;
return;
}
/* seek to current block */
if (!cdd.index)
{
/* no AUDIO track playing */
scd.regs[0x36>>1].byte.h = 0x01;
/* DATA track */
fseek(cdd.toc.tracks[0].fd, cdd.lba * cdd.sectorSize, SEEK_SET);
}
#ifdef USE_LIBTREMOR
else if (cdd.toc.tracks[cdd.index].vf.seekable)
{
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* check if a new track is being played */
if (!cdd.toc.tracks[cdd.index].vf.datasource)
{
/* VORBIS file need to be opened first */
ov_open(cdd.toc.tracks[cdd.index].fd,&cdd.toc.tracks[cdd.index].vf,0,0);
}
#endif
/* VORBIS AUDIO track */
ov_pcm_seek(&cdd.toc.tracks[cdd.index].vf, (cdd.lba - cdd.toc.tracks[cdd.index].start) * 588 - cdd.toc.tracks[cdd.index].offset);
}
#endif
else if (cdd.toc.tracks[cdd.index].fd)
{
/* PCM AUDIO track */
fseek(cdd.toc.tracks[cdd.index].fd, (cdd.lba * 2352) - cdd.toc.tracks[cdd.index].offset, SEEK_SET);
}
}
}
void cdd_process(void)
{
/* Process CDD command */
switch (scd.regs[0x42>>1].byte.h & 0x0f)
{
case 0x00: /* Drive Status */
{
/* RS1-RS8 normally unchanged */
scd.regs[0x38>>1].byte.h = cdd.status;
/* unless RS1 indicated invalid track infos */
if (scd.regs[0x38>>1].byte.l == 0x0f)
{
/* and SEEK has ended */
if (cdd.status != CD_SEEK)
{
/* then return valid track infos, e.g current track number in RS2-RS3 (fixes Lunar - The Silver Star) */
scd.regs[0x38>>1].byte.l = 0x02;
scd.regs[0x3a>>1].w = (cdd.index < cdd.toc.last) ? lut_BCD_16[cdd.index + 1] : 0x0A0A;
}
}
break;
}
case 0x01: /* Stop Drive */
{
/* update status */
cdd.status = cdd.loaded ? CD_STOP : NO_DISC;
/* no audio track playing */
scd.regs[0x36>>1].byte.h = 0x01;
/* RS1-RS8 ignored, expects 0x0 ("no disc" ?) in RS0 once */
scd.regs[0x38>>1].w = 0x0000;
scd.regs[0x3a>>1].w = 0x0000;
scd.regs[0x3c>>1].w = 0x0000;
scd.regs[0x3e>>1].w = 0x0000;
scd.regs[0x40>>1].w = 0x000f;
return;
}
case 0x02: /* Read TOC */
{
/* Infos automatically retrieved by CDD processor from Q-Channel */
/* commands 0x00-0x02 (current block) and 0x03-0x05 (Lead-In) */
switch (scd.regs[0x44>>1].byte.l)
{
case 0x00: /* Current Absolute Time (MM:SS:FF) */
{
int lba = cdd.lba + 150;
scd.regs[0x38>>1].w = cdd.status << 8;
scd.regs[0x3a>>1].w = lut_BCD_16[(lba/75)/60];
scd.regs[0x3c>>1].w = lut_BCD_16[(lba/75)%60];
scd.regs[0x3e>>1].w = lut_BCD_16[(lba%75)];
scd.regs[0x40>>1].byte.h = cdd.index ? 0x00 : 0x04; /* Current block flags in RS8 (bit0 = mute status, bit1: pre-emphasis status, bit2: track type) */
break;
}
case 0x01: /* Current Track Relative Time (MM:SS:FF) */
{
int lba = cdd.lba - cdd.toc.tracks[cdd.index].start;
scd.regs[0x38>>1].w = (cdd.status << 8) | 0x01;
scd.regs[0x3a>>1].w = lut_BCD_16[(lba/75)/60];
scd.regs[0x3c>>1].w = lut_BCD_16[(lba/75)%60];
scd.regs[0x3e>>1].w = lut_BCD_16[(lba%75)];
scd.regs[0x40>>1].byte.h = cdd.index ? 0x00 : 0x04; /* Current block flags in RS8 (bit0 = mute status, bit1: pre-emphasis status, bit2: track type) */
break;
}
case 0x02: /* Current Track Number */
{
scd.regs[0x38>>1].w = (cdd.status << 8) | 0x02;
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[0x3e>>1].w = 0x0000; /* Disk Control Code (?) in RS6 */
scd.regs[0x40>>1].byte.h = 0x00;
break;
}
case 0x03: /* Total length (MM:SS:FF) */
{
int lba = cdd.toc.end + 150;
scd.regs[0x38>>1].w = (cdd.status << 8) | 0x03;
scd.regs[0x3a>>1].w = lut_BCD_16[(lba/75)/60];
scd.regs[0x3c>>1].w = lut_BCD_16[(lba/75)%60];
scd.regs[0x3e>>1].w = lut_BCD_16[(lba%75)];
scd.regs[0x40>>1].byte.h = 0x00;
break;
}
case 0x04: /* First & Last Track Numbers */
{
scd.regs[0x38>>1].w = (cdd.status << 8) | 0x04;
scd.regs[0x3a>>1].w = 0x0001;
scd.regs[0x3c>>1].w = lut_BCD_16[cdd.toc.last];
scd.regs[0x3e>>1].w = 0x0000; /* Drive Version (?) in RS6-RS7 */
scd.regs[0x40>>1].byte.h = 0x00; /* Lead-In flags in RS8 (bit0 = mute status, bit1: pre-emphasis status, bit2: track type) */
break;
}
case 0x05: /* Track Start Time (MM:SS:FF) */
{
int track = scd.regs[0x46>>1].byte.h * 10 + scd.regs[0x46>>1].byte.l;
int lba = cdd.toc.tracks[track-1].start + 150;
scd.regs[0x38>>1].w = (cdd.status << 8) | 0x05;
scd.regs[0x3a>>1].w = lut_BCD_16[(lba/75)/60];
scd.regs[0x3c>>1].w = lut_BCD_16[(lba/75)%60];
scd.regs[0x3e>>1].w = lut_BCD_16[(lba%75)];
scd.regs[0x40>>1].byte.h = track % 10; /* Track Number (low digit) */
if (track == 1)
{
/* RS6 bit 3 is set for the first (DATA) track */
scd.regs[0x3e>>1].byte.h |= 0x08;
}
break;
}
default:
{
#ifdef LOG_ERROR
error("Unknown CDD Command %02X (%X)\n", scd.regs[0x44>>1].byte.l, s68k.pc);
#endif
return;
}
}
break;
}
case 0x03: /* Play */
{
/* reset track index */
int index = 0;
/* new LBA position */
int lba = ((scd.regs[0x44>>1].byte.h * 10 + scd.regs[0x44>>1].byte.l) * 60 +
(scd.regs[0x46>>1].byte.h * 10 + scd.regs[0x46>>1].byte.l)) * 75 +
(scd.regs[0x48>>1].byte.h * 10 + scd.regs[0x48>>1].byte.l) - 150;
/* CD drive latency */
if (!cdd.latency)
{
/* Fixes a few games hanging during intro because they expect data to be read with some delay */
/* Radical Rex needs at least one interrupt delay */
/* Wolf Team games (Anet Futatabi, Cobra Command, Road Avenger & Time Gal) need at least 6 interrupts delay */
/* Space Adventure Cobra (2nd morgue scene) needs at least 13 interrupts delay (incl. seek time, so 6 is OK) */
/* Jeopardy & ESPN Sunday Night NFL are picky about this as well: 10 interrupts delay (+ seek time) seems OK */
cdd.latency = 10;
}
/* CD drive seek time */
/* max. seek time = 1.5 s = 1.5 x 75 = 112.5 CDD interrupts (rounded to 120) for 270000 sectors max on disc. */
/* Note: This is only a rough approximation since, on real hardware, seek time is much likely not linear and */
/* latency much larger than above value, but this model works fine for Sonic CD (track 26 playback needs to */
/* be enough delayed to start in sync with intro sequence, as compared with real hardware recording). */
if (lba > cdd.lba)
{
cdd.latency += (((lba - cdd.lba) * 120) / 270000);
}
else
{
cdd.latency += (((cdd.lba - lba) * 120) / 270000);
}
/* update current LBA */
cdd.lba = lba;
/* get track index */
while ((cdd.toc.tracks[index].end <= lba) && (index < cdd.toc.last)) index++;
#ifdef USE_LIBTREMOR
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* check if track index has changed */
if (index != cdd.index)
{
/* close previous track VORBIS file structure to save memory */
if (cdd.toc.tracks[cdd.index].vf.datasource)
{
ogg_free(cdd.index);
}
/* open current track VORBIS file */
if (cdd.toc.tracks[index].vf.seekable)
{
ov_open(cdd.toc.tracks[index].fd,&cdd.toc.tracks[index].vf,0,0);
}
}
#endif
#endif
/* update current track index */
cdd.index = index;
/* stay within track limits when seeking files */
if (lba < cdd.toc.tracks[index].start)
{
lba = cdd.toc.tracks[index].start;
}
/* seek to current block */
if (!index)
{
/* DATA track */
fseek(cdd.toc.tracks[0].fd, lba * cdd.sectorSize, SEEK_SET);
}
#ifdef USE_LIBTREMOR
else if (cdd.toc.tracks[index].vf.seekable)
{
/* VORBIS AUDIO track */
ov_pcm_seek(&cdd.toc.tracks[index].vf, (lba - cdd.toc.tracks[index].start) * 588 - cdd.toc.tracks[index].offset);
}
#endif
else if (cdd.toc.tracks[index].fd)
{
/* PCM AUDIO track */
fseek(cdd.toc.tracks[index].fd, (lba * 2352) - cdd.toc.tracks[index].offset, SEEK_SET);
}
/* no audio track playing (yet) */
scd.regs[0x36>>1].byte.h = 0x01;
/* update status */
cdd.status = CD_PLAY;
/* return track index in RS2-RS3 */
scd.regs[0x38>>1].w = (CD_PLAY << 8) | 0x02;
scd.regs[0x3a>>1].w = (cdd.index < cdd.toc.last) ? lut_BCD_16[index + 1] : 0x0A0A;
scd.regs[0x3c>>1].w = 0x0000;
scd.regs[0x3e>>1].w = 0x0000;
scd.regs[0x40>>1].byte.h = 0x00;
break;
}
case 0x04: /* Seek */
{
/* reset track index */
int index = 0;
/* new LBA position */
int lba = ((scd.regs[0x44>>1].byte.h * 10 + scd.regs[0x44>>1].byte.l) * 60 +
(scd.regs[0x46>>1].byte.h * 10 + scd.regs[0x46>>1].byte.l)) * 75 +
(scd.regs[0x48>>1].byte.h * 10 + scd.regs[0x48>>1].byte.l) - 150;
/* CD drive seek time */
/* We are using similar linear model as above, although still not exactly accurate, */
/* it works fine for Switch/Panic! intro (Switch needs at least 30 interrupts while */
/* seeking from 00:05:63 to 24:03:19, Panic! when seeking from 00:05:60 to 24:06:07) */
if (lba > cdd.lba)
{
cdd.latency = ((lba - cdd.lba) * 120) / 270000;
}
else
{
cdd.latency = ((cdd.lba - lba) * 120) / 270000;
}
/* update current LBA */
cdd.lba = lba;
/* get current track index */
while ((cdd.toc.tracks[index].end <= lba) && (index < cdd.toc.last)) index++;
#ifdef USE_LIBTREMOR
#ifdef DISABLE_MANY_OGG_OPEN_FILES
/* check if track index has changed */
if (index != cdd.index)
{
/* close previous track VORBIS file structure to save memory */
if (cdd.toc.tracks[cdd.index].vf.datasource)
{
ogg_free(cdd.index);
}
/* open current track VORBIS file */
if (cdd.toc.tracks[index].vf.seekable)
{
ov_open(cdd.toc.tracks[index].fd,&cdd.toc.tracks[index].vf,0,0);
}
}
#endif
#endif
/* update current track index */
cdd.index = index;
/* stay within track limits */
if (lba < cdd.toc.tracks[index].start)
{
lba = cdd.toc.tracks[index].start;
}
/* seek to current block */
if (!index)
{
/* DATA track */
fseek(cdd.toc.tracks[0].fd, lba * cdd.sectorSize, SEEK_SET);
}
#ifdef USE_LIBTREMOR
else if (cdd.toc.tracks[index].vf.seekable)
{
/* VORBIS AUDIO track */
ov_pcm_seek(&cdd.toc.tracks[index].vf, (lba - cdd.toc.tracks[index].start) * 588 - cdd.toc.tracks[index].offset);
}
#endif
else if (cdd.toc.tracks[index].fd)
{
/* PCM AUDIO track */
fseek(cdd.toc.tracks[index].fd, (lba * 2352) - cdd.toc.tracks[index].offset, SEEK_SET);
}
/* no audio track playing */
scd.regs[0x36>>1].byte.h = 0x01;
/* update status */
cdd.status = CD_SEEK;
/* unknown RS1-RS8 values (returning 0xF in RS1 invalidates track infos in RS2-RS8 and fixes Final Fight CD intro when seek time is emulated) */
scd.regs[0x38>>1].w = (CD_SEEK << 8) | 0x0f;
scd.regs[0x3a>>1].w = 0x0000;
scd.regs[0x3c>>1].w = 0x0000;
scd.regs[0x3e>>1].w = 0x0000;
scd.regs[0x40>>1].w = ~(CD_SEEK + 0xf) & 0x0f;
return;
}
case 0x06: /* Pause */
{
/* no audio track playing */
scd.regs[0x36>>1].byte.h = 0x01;
/* update status (RS1-RS8 unchanged) */
cdd.status = scd.regs[0x38>>1].byte.h = CD_READY;
break;
}
case 0x07: /* Resume */
{
/* update status (RS1-RS8 unchanged) */
cdd.status = scd.regs[0x38>>1].byte.h = CD_PLAY;
break;
}
case 0x08: /* Forward Scan */
{
/* reset scanning direction / speed */
cdd.scanOffset = CD_SCAN_SPEED;
/* update status (RS1-RS8 unchanged) */
cdd.status = scd.regs[0x38>>1].byte.h = CD_SCAN;
break;
}
case 0x09: /* Rewind Scan */
{
/* reset scanning direction / speed */
cdd.scanOffset = -CD_SCAN_SPEED;
/* update status (RS1-RS8 unchanged) */
cdd.status = scd.regs[0x38>>1].byte.h = CD_SCAN;
break;
}
case 0x0a: /* N-Track Jump Control ? (usually sent before CD_SEEK or CD_PLAY commands) */
{
/* TC3 corresponds to seek direction (00=forward, FF=reverse) */
/* TC4-TC7 are related to seek length (4x4 bits i.e parameter values are between -65535 and +65535) */
/* Maybe related to number of auto-sequenced track jumps/moves for CD DSP (cf. CXD2500BQ datasheet) */
/* also see US Patent nr. 5222054 for a detailled description of seeking operation using Track Jump */
/* no audio track playing */
scd.regs[0x36>>1].byte.h = 0x01;
/* update status (RS1-RS8 unchanged) */
cdd.status = scd.regs[0x38>>1].byte.h = CD_READY;
break;
}
case 0x0c: /* Close Tray */
{
/* no audio track playing */
scd.regs[0x36>>1].byte.h = 0x01;
/* update status */
cdd.status = cdd.loaded ? CD_STOP : NO_DISC;
/* RS1-RS8 ignored, expects 0x0 ("no disc" ?) in RS0 once */
scd.regs[0x38>>1].w = 0x0000;
scd.regs[0x3a>>1].w = 0x0000;
scd.regs[0x3c>>1].w = 0x0000;
scd.regs[0x3e>>1].w = 0x0000;
scd.regs[0x40>>1].w = 0x000f;
#ifdef CD_TRAY_CALLBACK
CD_TRAY_CALLBACK
#endif
return;
}
case 0x0d: /* Open Tray */
{
/* no audio track playing */
scd.regs[0x36>>1].byte.h = 0x01;
/* update status (RS1-RS8 ignored) */
cdd.status = CD_OPEN;
scd.regs[0x38>>1].w = CD_OPEN << 8;
scd.regs[0x3a>>1].w = 0x0000;
scd.regs[0x3c>>1].w = 0x0000;
scd.regs[0x3e>>1].w = 0x0000;
scd.regs[0x40>>1].w = ~CD_OPEN & 0x0f;
#ifdef CD_TRAY_CALLBACK
CD_TRAY_CALLBACK
#endif
return;
}
default: /* Unknown command */
#ifdef LOG_CDD
error("Unknown CDD Command !!!\n");
#endif
scd.regs[0x38>>1].byte.h = cdd.status;
break;
}
/* only compute checksum when necessary */
scd.regs[0x40>>1].byte.l = ~(scd.regs[0x38>>1].byte.h + scd.regs[0x38>>1].byte.l +
scd.regs[0x3a>>1].byte.h + scd.regs[0x3a>>1].byte.l +
scd.regs[0x3c>>1].byte.h + scd.regs[0x3c>>1].byte.l +
scd.regs[0x3e>>1].byte.h + scd.regs[0x3e>>1].byte.l +
scd.regs[0x40>>1].byte.h) & 0x0f;
}
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