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cdd.c
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cdd.c
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/***************************************************************************************
* Genesis Plus
* CD drive processor & CD-DA fader
*
* Copyright (C) 2012-2024 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"
#include "megasd.h"
#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS)
#define SUPPORTED_EXT 20
#else
#define SUPPORTED_EXT 10
#endif
/* CD blocks scanning speed */
#define CD_SCAN_SPEED 30
/* CD tracks type (CD-DA by default) */
#define TYPE_AUDIO 0x00
#define TYPE_MODE1 0x01
#define TYPE_MODE2 0x02
/* 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 audio file extensions */
static const char extensions[SUPPORTED_EXT][16] =
{
#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS)
"%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"
};
#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS)
static int seek64_wrap(void *f,ogg_int64_t off,int whence){
return cdStreamSeek(f,off,whence);
}
static ov_callbacks cb =
{
(size_t (*)(void *, size_t, size_t, void *)) cdStreamRead,
(int (*)(void *, ogg_int64_t, int)) seek64_wrap,
(int (*)(void *)) cdStreamClose,
(long (*)(void *)) cdStreamTell
};
#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 */
cdStreamSeek(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], 44100, samplerate);
}
void cdd_reset(void)
{
/* 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_TOC : NO_DISC;
/* reset CD-DA fader (full volume) */
cdd.fader[0] = cdd.fader[1] = 0x400;
/* clear CD-DA output */
cdd.audio[0] = cdd.audio[1] = 0;
}
int cdd_context_save(uint8 *state)
{
int bufferptr = 0;
unsigned int offset = 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.fader, sizeof(cdd.fader));
save_param(&cdd.status, sizeof(cdd.status));
/* current track is an audio track ? */
if (cdd.toc.tracks[cdd.index].type == TYPE_AUDIO)
{
/* get file read offset */
#if defined(USE_LIBCHDR)
if (cdd.chd.file)
{
/* CHD file offset */
offset = cdd.chd.hunkofs;
}
else
#endif
#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS)
if (cdd.toc.tracks[cdd.index].vf.seekable)
{
/* VORBIS file sample offset */
offset = ov_pcm_tell(&cdd.toc.tracks[cdd.index].vf);
}
else
#endif
if (cdd.toc.tracks[cdd.index].fd)
{
/* PCM file offset */
offset = cdStreamTell(cdd.toc.tracks[cdd.index].fd);
}
}
save_param(&offset, sizeof(offset));
save_param(&cdd.audio, sizeof(cdd.audio));
return bufferptr;
}
int cdd_context_load(uint8 *state, char *version)
{
unsigned int offset, lba, index;
int bufferptr = 0;
load_param(&cdd.cycles, sizeof(cdd.cycles));
load_param(&cdd.latency, sizeof(cdd.latency));
load_param(&index, sizeof(cdd.index));
load_param(&lba, sizeof(cdd.lba));
load_param(&cdd.scanOffset, sizeof(cdd.scanOffset));
load_param(&cdd.fader, sizeof(cdd.fader));
load_param(&cdd.status, sizeof(cdd.status));
/* update current sector */
cdd.lba = lba;
/* support for previous state version (1.7.5) */
if ((version[11] == 0x31) && (version[13] == 0x37) && (version[15] == 0x35))
{
/* current track is an audio track ? */
if (cdd.toc.tracks[index].type == TYPE_AUDIO)
{
/* stay within track limits when seeking files */
if (lba < cdd.toc.tracks[index].start)
{
lba = cdd.toc.tracks[index].start;
}
/* seek to current track sector */
cdd_seek_audio(index, lba);
}
}
else
{
load_param(&offset, sizeof(offset));
load_param(&cdd.audio, sizeof(cdd.audio));
/* current track is an audio track ? */
if (cdd.toc.tracks[index].type == TYPE_AUDIO)
{
#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS)
#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_callbacks(cdd.toc.tracks[index].fd,&cdd.toc.tracks[index].vf,0,0,cb);
}
}
#endif
#endif
/* seek to current file read offset */
#if defined(USE_LIBCHDR)
if (cdd.chd.file)
{
/* CHD file offset */
cdd.chd.hunkofs = offset;
}
else
#endif
#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS)
if (cdd.toc.tracks[index].vf.seekable)
{
/* VORBIS file sample offset */
ov_pcm_seek(&cdd.toc.tracks[index].vf, offset);
}
else
#endif
if (cdd.toc.tracks[index].fd)
{
/* PCM file offset */
cdStreamSeek(cdd.toc.tracks[index].fd, offset, SEEK_SET);
}
}
}
/* seek to current subcode position */
if (cdd.toc.sub)
{
/* 96 bytes per sector */
cdStreamSeek(cdd.toc.sub, lba * 96, SEEK_SET);
}
/* update current track index */
cdd.index = index;
return bufferptr;
}
int cdd_load(char *filename, char *header)
{
char fname[256+10];
char line[128];
char *ptr, *lptr;
cdStream *fd;
/* assume normal CD image file by default */
int isCDfile = 1;
int isMSDfile = 0;
/* first unmount any loaded disc */
cdd_unload();
/* open file */
fd = cdStreamOpen(filename);
if (!fd)
{
/* do not return an error as this could be a ROM loaded in memory */
/* which should be handled by load_archive function */
return (0);
}
#if defined(USE_LIBCHDR)
if (!memcmp("chd", &filename[strlen(filename) - 3], 3) || !memcmp("CHD", &filename[strlen(filename) - 3], 3))
{
int sectors = 0;
char metadata[256];
const chd_header *head;
/* open CHD file */
if (chd_open_file(fd, CHD_OPEN_READ, NULL, &cdd.chd.file) != CHDERR_NONE)
{
chd_close(cdd.chd.file);
cdStreamClose(fd);
return -1;
}
/* retrieve CHD header */
head = chd_get_header(cdd.chd.file);
/* detect invalid hunk size */
if ((head->hunkbytes == 0) || (head->hunkbytes % CD_FRAME_SIZE))
{
chd_close(cdd.chd.file);
cdStreamClose(fd);
return -1;
}
/* allocate hunk buffer */
cdd.chd.hunk = (uint8 *)malloc(head->hunkbytes);
if (!cdd.chd.hunk)
{
chd_close(cdd.chd.file);
cdStreamClose(fd);
return -1;
}
/* initialize hunk size (usually fixed to 8 sectors) */
cdd.chd.hunkbytes = head->hunkbytes;
/* initialize buffered hunk index */
cdd.chd.hunknum = -1;
/* retrieve tracks informations */
for (cdd.toc.last = 0; cdd.toc.last < 99; cdd.toc.last++)
{
int tracknum = 0, frames = 0, pregap = 0, postgap = 0;
char type[16], subtype[16], pgtype[16], pgsub[16];
type[0] = subtype[0] = pgtype[0] = pgsub[0] = 0;
/* attempt fetch either complete or partial metadata for current track */
if (chd_get_metadata(cdd.chd.file, CDROM_TRACK_METADATA2_TAG, cdd.toc.last, metadata, 256, 0, 0, 0) == CHDERR_NONE)
{
if (sscanf(metadata, CDROM_TRACK_METADATA2_FORMAT, &tracknum, &type[0], &subtype[0], &frames, &pregap, &pgtype[0], &pgsub[0], &postgap) != 8)
break;
}
else if (chd_get_metadata(cdd.chd.file, CDROM_TRACK_METADATA_TAG, cdd.toc.last, metadata, 256, 0, 0, 0) == CHDERR_NONE)
{
if (sscanf(metadata, CDROM_TRACK_METADATA_FORMAT, &tracknum, &type[0], &subtype[0], &frames) != 4)
break;
}
/* no more track */
else break;
/* detect out of order track number or invalid parameter */
if ((tracknum != (cdd.toc.last + 1)) || (frames < 0) || (pregap < 0) || (postgap < 0))
break;
/* detect track type */
if (cdd.toc.last)
{
/* CD-ROM track supported only for first track */
if (strcmp(type, "AUDIO"))
break;
/* Audio track start LBA (adjusted with pregap length) */
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end + pregap;
}
else
{
if (!strcmp(type, "MODE1_RAW"))
{
/* Mode 1 RAW format (2352 bytes data blocks) */
cdd.sectorSize = 2352;
cdd.toc.tracks[0].type = TYPE_MODE1;
}
else if (!strcmp(type, "MODE1"))
{
/* Mode 1 COOKED format (2048 bytes data blocks) */
cdd.sectorSize = 2048;
cdd.toc.tracks[0].type = TYPE_MODE1;
}
else if (!strcmp(type, "MODE2_RAW"))
{
/* Mode 2 RAW format (2352 bytes data blocks) */
cdd.sectorSize = 2352;
cdd.toc.tracks[0].type = TYPE_MODE2;
}
else if (strcmp(type, "AUDIO"))
{
/* unsupported track format */
break;
}
/* First track start LBA (2s pause assumed by default) */
cdd.toc.tracks[0].start = 0;
}
/* detect pregap type */
if (pgtype[0] != 'V')
{
/* clear pause length for further calculations (not included in CHD file) */
pregap = 0;
}
/* track end LBA (remove included pause from CHD track length) */
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + frames - pregap;
/* CHD file offset for current track */
cdd.toc.tracks[cdd.toc.last].offset = (sectors + pregap - cdd.toc.tracks[cdd.toc.last].start) * CD_FRAME_SIZE;
/* update TOC end with postgap length */
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end + postgap;
/* update CHD file sector count (adjusted with end of the track padding) */
sectors += (((frames + CD_TRACK_PADDING - 1) / CD_TRACK_PADDING) * CD_TRACK_PADDING);
/* indicate valid track file */
cdd.toc.tracks[cdd.toc.last].fd = fd;
}
/* valid CD-ROM image file ? */
if (cdd.sectorSize)
{
/* read first chunk of data */
cdd.chd.hunknum = cdd.toc.tracks[0].offset / cdd.chd.hunkbytes;
chd_read(cdd.chd.file, cdd.chd.hunknum, cdd.chd.hunk);
/* copy CD image header + security code (skip RAW sector 16-byte header) */
memcpy(header, cdd.chd.hunk + (cdd.toc.tracks[0].offset % cdd.chd.hunkbytes) + ((cdd.sectorSize == 2048) ? 0 : 16), 0x210);
}
/* valid CD image ? */
if (cdd.toc.last && (cdd.toc.end < (100*60*75)))
{
/* Lead-out */
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
/* CD mounted */
cdd.loaded = HW_ADDON_MEGACD;
return 1;
}
/* invalid CHD file */
chd_close(cdd.chd.file);
cdStreamClose(fd);
return -1;
}
#endif
/* save a copy of base filename (max. 255 characters) */
strncpy(fname, filename, 255);
fname[256] = 0;
/* check loaded file extension */
if (memcmp("cue", &filename[strlen(filename) - 3], 3) && memcmp("CUE", &filename[strlen(filename) - 3], 3))
{
int len;
static const uint8 sync[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
/* read first 16 bytes */
cdStreamRead(header, 0x10, 1, fd);
/* auto-detect valid Sega CD image */
if (!memcmp("SEGADISCSYSTEM", header, 14))
{
/* COOKED CD-ROM image (2048 bytes data blocks) */
cdd.sectorSize = 2048;
/* CD-ROM Mode 1 by default */
cdd.toc.tracks[0].type = TYPE_MODE1;
}
/* auto-detect CD-ROM synchro pattern */
else if (!memcmp(sync, header, 12))
{
/* RAW CD-ROM image (2352 bytes data blocks) */
cdd.sectorSize = 2352;
/* auto-detect CD-ROM mode from block header (byte 15) */
cdd.toc.tracks[0].type = header[15];
/* read next 16 bytes (start of user data) */
cdStreamRead(header, 0x10, 1, fd);
}
/* supported CD-ROM image file ? */
if ((cdd.toc.tracks[0].type == TYPE_MODE1) || (cdd.toc.tracks[0].type == TYPE_MODE2))
{
/* read Sega CD image header + security code */
cdStreamRead(header + 0x10, 0x200, 1, fd);
/* initialize first track file descriptor */
cdd.toc.tracks[0].fd = fd;
/* DATA track end LBA (based on DATA file length) */
cdStreamSeek(fd, 0, SEEK_END);
cdd.toc.tracks[0].end = cdStreamTell(fd) / cdd.sectorSize;
/* DATA track length should be at least 2s (BIOS requirement) */
if (cdd.toc.tracks[0].end < 150)
{
cdd.toc.tracks[0].end = 150;
}
/* DATA track start LBA (logical block 0) */
cdStreamSeek(fd, 0, SEEK_SET);
cdd.toc.tracks[0].start = 0;
/* initialize TOC */
cdd.toc.end = cdd.toc.tracks[0].end;
cdd.toc.last = 1;
}
else
{
/* this is not a supported CD-ROM image file */
isCDfile = 0;
/* close file */
cdStreamClose(fd);
}
/* automatically try to mount CD associated CUE file */
len = strlen(fname);
while ((len && (fname[len] != '.')) || (len > 251)) len--;
strcpy(&fname[len], ".cue");
fd = cdStreamOpen(fname);
}
/* parse CUE file */
if (fd)
{
int mm, ss, bb, pregap = 0;
int index = 0;
/* DATA track already loaded ? */
if (cdd.toc.last)
{
/* skip first track */
while (cdStreamGets(line, 128, fd))
{
if (strstr(line, "INDEX 01") && !strstr(line, "INDEX 1"))
break;
}
}
/* read lines until end of file */
while (cdStreamGets(line, 128, fd))
{
/* skip any SPACE characters */
lptr = line;
while (*lptr == 0x20) lptr++;
/* decode FILE commands */
if (!(memcmp(lptr, "FILE", 4)))
{
/* retrieve current path */
ptr = fname + strlen(fname) - 1;
while ((ptr - fname) && (*ptr != '/') && (*ptr != '\\')) ptr--;
if (ptr - fname) ptr++;
/* skip "FILE" attribute */
lptr += 4;
/* skip SPACE characters */
while (*lptr == 0x20) lptr++;
/* retrieve full filename */
if (*lptr == '\"')
{
/* skip first DOUBLE QUOTE character */
lptr++;
while ((*lptr != '\"') && (lptr <= (line + 128)) && (ptr < (fname + 255)))
*ptr++ = *lptr++;
}
else
{
/* no DOUBLE QUOTE used */
while ((*lptr != 0x20) && (lptr <= (line + 128)) && (ptr < (fname + 255)))
*ptr++ = *lptr++;
}
*ptr = 0;
/* open current track file descriptor */
cdd.toc.tracks[cdd.toc.last].fd = cdStreamOpen(fname);
if (!cdd.toc.tracks[cdd.toc.last].fd)
{
/* error opening file */
break;
}
/* reset current file PREGAP length */
pregap = 0;
/* reset current track file read offset */
cdd.toc.tracks[cdd.toc.last].offset = 0;
/* check supported audio file types */
if (!strstr(lptr,"BINARY") && !strstr(lptr,"MOTOROLA"))
{
/* read file header */
unsigned char head[12];
cdStreamRead(head, 12, 1, cdd.toc.tracks[cdd.toc.last].fd);
cdStreamSeek(cdd.toc.tracks[cdd.toc.last].fd, 0, SEEK_SET);
/* autodetect WAVE file */
if (!memcmp(head, "RIFF", 4) && !memcmp(head + 8, "WAVE", 4))
{
/* look for 'data' chunk */
int chunkSize, dataOffset = 0;
cdStreamSeek(cdd.toc.tracks[cdd.toc.last].fd, 12, SEEK_SET);
while (cdStreamRead(head, 8, 1, cdd.toc.tracks[cdd.toc.last].fd))
{
if (!memcmp(head, "data", 4))
{
dataOffset = cdStreamTell(cdd.toc.tracks[cdd.toc.last].fd);
cdStreamSeek(cdd.toc.tracks[cdd.toc.last].fd, 0, SEEK_SET);
break;
}
chunkSize = head[4] + (head[5] << 8) + (head[6] << 16) + (head[7] << 24);
cdStreamSeek(cdd.toc.tracks[cdd.toc.last].fd, chunkSize, SEEK_CUR);
}
/* check if 'data' chunk has not been found */
if (!dataOffset)
{
/* invalid WAVE file */
cdStreamClose(cdd.toc.tracks[cdd.toc.last].fd);
cdd.toc.tracks[cdd.toc.last].fd = 0;
break;
}
/* adjust current track file read offset with WAVE header length */
cdd.toc.tracks[cdd.toc.last].offset -= dataOffset;
}
#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS)
else if (!ov_open_callbacks(cdd.toc.tracks[cdd.toc.last].fd,&cdd.toc.tracks[cdd.toc.last].vf,0,0,cb))
{
/* 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 */
cdStreamClose(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 %*s", &bb)) || (sscanf(lptr, "TRACK %d %*s", &bb)))
{
/* autodetect DATA track type (first track only) */
if (!cdd.toc.last)
{
if (strstr(lptr,"MODE1/2048"))
{
/* Mode 1 COOKED format (2048 bytes / block) */
cdd.sectorSize = 2048;
cdd.toc.tracks[0].type = TYPE_MODE1;
}
else if (strstr(lptr,"MODE1/2352"))
{
/* Mode 1 RAW format (2352 bytes / block) */
cdd.sectorSize = 2352;
cdd.toc.tracks[0].type = TYPE_MODE1;
}
else if (strstr(lptr,"MODE2/2352"))
{
/* Mode 2 RAW format (2352 bytes / block) */
cdd.sectorSize = 2352;
cdd.toc.tracks[0].type = TYPE_MODE2;
}
if (cdd.sectorSize)
{
if (cdd.sectorSize == 2352)
{
/* skip 16-byte header */
cdStreamSeek(cdd.toc.tracks[0].fd, 0x10, SEEK_SET);
}
/* read CD image header + security code */
cdStreamRead(header, 0x210, 1, cdd.toc.tracks[0].fd);
cdStreamSeek(cdd.toc.tracks[0].fd, 0, SEEK_SET);
}
}
else
{
/* check if same file is used for consecutive tracks */
if (!cdd.toc.tracks[cdd.toc.last].fd)
{
/* clear previous track end time */
cdd.toc.tracks[cdd.toc.last - 1].end = 0;
}
}
/* save current track index */
index = cdd.toc.last;
}
/* decode REM LOOP xxx command (MegaSD specific command) */
else if (sscanf(lptr, "REM LOOP %d", &bb) == 1)
{
cdd.toc.tracks[index].loopEnabled = 1;
cdd.toc.tracks[index].loopOffset = bb;
isMSDfile = 1;
}
/* decode REM LOOP command (MegaSD specific command) */
else if (strstr(lptr,"REM LOOP"))
{
cdd.toc.tracks[index].loopEnabled = 1;
isMSDfile = 1;
}
/* decode REM NOLOOP command (MegaSD specific command) */
else if (strstr(lptr,"REM NOLOOP"))
{
cdd.toc.tracks[index].loopEnabled = -1;
isMSDfile = 1;
}
/* 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 previous track end time needs to be set */
if (cdd.toc.last && !cdd.toc.tracks[cdd.toc.last - 1].end)
{
/* set previous track end time (current file absolute time + PREGAP length) */
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 current track file read offset with current file PREGAP length (only used for AUDIO track) */
cdd.toc.tracks[cdd.toc.last].offset += pregap * 2352;
/* check if a single file is used for consecutive tracks */
if (!cdd.toc.tracks[cdd.toc.last].fd && cdd.toc.last)
{
/* use common file descriptor */
cdd.toc.tracks[cdd.toc.last].fd = cdd.toc.tracks[cdd.toc.last - 1].fd;
/* current track start time (based on current file absolute time + PREGAP length) */
cdd.toc.tracks[cdd.toc.last].start = bb + ss*75 + mm*60*75 + pregap;
/* check if previous track end time needs to be set */
if (!cdd.toc.tracks[cdd.toc.last - 1].end)
{
/* set previous track end time (based on current track start time, ignoring any "PREGAP"-type pause if no INDEX00) */
cdd.toc.tracks[cdd.toc.last - 1].end = cdd.toc.tracks[cdd.toc.last].start;
}
}
else
{
/* current file start time (based on previous track end time + PREGAP length) */
cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end + pregap;
/* adjust current track file read offset with previous track end time (only used for AUDIO track) */
cdd.toc.tracks[cdd.toc.last].offset += cdd.toc.end * 2352;
#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS)
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 */
cdStreamSeek(cdd.toc.tracks[cdd.toc.last].fd, 0, SEEK_END);
if (cdd.toc.tracks[cdd.toc.last].type)
{
/* DATA track length */
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + (cdStreamTell(cdd.toc.tracks[cdd.toc.last].fd) / cdd.sectorSize);
}
else
{
/* AUDIO track length */
cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + (cdStreamTell(cdd.toc.tracks[cdd.toc.last].fd) / 2352);
}
cdStreamSeek(cdd.toc.tracks[cdd.toc.last].fd, 0, SEEK_SET);
}
/* adjust track start time (based on current file start time + index absolute time) */
cdd.toc.tracks[cdd.toc.last].start += (bb + ss*75 + mm*60*75);
/* update TOC end */
cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end;
}
/* increment track number */
cdd.toc.last++;
/* max. 99 tracks */
if (cdd.toc.last == 99) break;
}
}
/* check if last track end time needs to be set */
if (cdd.toc.last && !cdd.toc.tracks[cdd.toc.last - 1].end)
{
/* adjust TOC end with current file PREGAP length */
cdd.toc.end += pregap;
/* last track end time */
cdd.toc.tracks[cdd.toc.last - 1].end = cdd.toc.end;
}
/* close any incomplete track file */
#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS)
if (cdd.toc.tracks[cdd.toc.last].vf.datasource)
{
ov_clear(&cdd.toc.tracks[cdd.toc.last].vf);
}
else
#endif
if (cdd.toc.tracks[cdd.toc.last].fd)
{
cdStreamClose(cdd.toc.tracks[cdd.toc.last].fd);
}
/* close CUE file */
cdStreamClose(fd);
}
else if (cdd.toc.last)
{
int i, offset = 1;
/* set pointer at the end of filename */
ptr = fname + strlen(fname) - 4;
/* autodetect audio track file extensions */
for (i=0; i<SUPPORTED_EXT; i++)
{
/* auto-detect wrong initial track index */
sprintf(ptr, extensions[i], cdd.toc.last);
fd = cdStreamOpen(fname);
if (fd)
{
offset = 0;
break;
}
sprintf(ptr, extensions[i], cdd.toc.last + 1);
fd = cdStreamOpen(fname);
if (fd) break;
}
/* repeat until no more valid track files can be found */
while (fd)
{
/* read file header */
unsigned char head[12];
cdStreamRead(head, 12, 1, fd);
cdStreamSeek(fd, 0, SEEK_SET);
/* autodetect WAVE file */
if (!memcmp(head, "RIFF", 4) && !memcmp(head + 8, "WAVE", 4))
{
/* look for 'data' chunk */
int chunkSize, dataOffset = 0;
cdStreamSeek(fd, 12, SEEK_SET);
while (cdStreamRead(head, 8, 1, fd))
{
if (!memcmp(head, "data", 4))
{
dataOffset = cdStreamTell(fd);
cdStreamSeek(fd, 0, SEEK_SET);