/*************************************************************************************** * Genesis Plus * CD drive processor & CD-DA fader * * Copyright (C) 2012-2016 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" #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_CDROM 0x01 /* 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] = { #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) #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; #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) #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 subcode position */ if (cdd.toc.sub) { /* 96 bytes per sector */ fseek(cdd.toc.sub, lba * 96, SEEK_SET); } /* seek to current track position */ if (cdd.toc.tracks[cdd.index].type) { /* DATA track */ fseek(cdd.toc.tracks[cdd.index].fd, lba * cdd.sectorSize, SEEK_SET); } #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) 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 * 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+10]; char line[128]; char *ptr, *lptr; FILE *fd; /* assume CD image file by default */ int isCDfile = 1; /* first unmount any loaded disc */ cdd_unload(); /* open file */ fd = fopen(filename, "rb"); if (!fd) return (-1); /* save a copy of base filename */ strncpy(fname, filename, 256); /* check loaded file extension */ if (memcmp(".cue", &filename[strlen(filename) - 4], 4) && memcmp(".CUE", &filename[strlen(filename) - 4], 4)) { int len; /* read first 16 bytes */ fread(header, 0x10, 1, fd); /* look for valid CD image identifier */ if (!memcmp("SEGADISCSYSTEM", header, 14)) { /* COOKED format (2048 bytes data blocks) */ cdd.sectorSize = 2048; } else { /* read next 16 bytes */ fread(header, 0x10, 1, fd); /* look for valid CD image identifier */ if (!memcmp("SEGADISCSYSTEM", header, 14)) { /* RAW format (2352 bytes data blocks) */ cdd.sectorSize = 2352; } } /* valid CD image file ? */ if (cdd.sectorSize) { /* read CD image header + security code */ fread(header + 0x10, 0x200, 1, fd); /* initialize first track file descriptor */ cdd.toc.tracks[0].fd = fd; /* this is a valid DATA track */ cdd.toc.tracks[0].type = TYPE_CDROM; /* DATA track end LBA (based on DATA file length) */ fseek(fd, 0, SEEK_END); cdd.toc.tracks[0].end = ftell(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) */ fseek(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 CD image file */ isCDfile = 0; /* close file */ fclose(fd); } /* automatically try to mount CD associated CUE file */ len = strlen(fname); while ((len && (fname[len] != '.')) || (len > 251)) len--; strcpy(&fname[len], ".cue"); fd = fopen(fname, "rb"); } /* parse CUE file */ if (fd) { int mm, ss, bb, pregap = 0; /* DATA track already loaded ? */ if (cdd.toc.last) { /* skip first track */ while (fgets(line, 128, fd)) { if (strstr(line, "INDEX 01") && !strstr(line, "INDEX 1")) break; } } /* read lines until end of file */ while (fgets(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 = fopen(fname, "rb"); 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[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 (44.1KHz 16-bit stereo format only) */ if (!memcmp(head, waveHeader, 32)) { /* adjust current track file read offset with WAVE header length */ cdd.toc.tracks[cdd.toc.last].offset -= 44; } #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) 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 %*s", &bb)) || (sscanf(lptr, "TRACK %d %*s", &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; } /* autodetect DATA track (first track only) */ if (!cdd.toc.last) { /* CD-ROM Mode 1 support only */ if (strstr(lptr,"MODE1/2048")) { /* COOKED format (2048 bytes / block) */ cdd.sectorSize = 2048; } else if (strstr(lptr,"MODE1/2352")) { /* RAW format (2352 bytes / block) */ cdd.sectorSize = 2352; /* skip 16-byte header */ fseek(cdd.toc.tracks[0].fd, 0x10, SEEK_SET); } if (cdd.sectorSize) { /* this is a valid DATA track */ cdd.toc.tracks[0].type = TYPE_CDROM; /* read CD image header + security code */ fread(header, 0x210, 1, cdd.toc.tracks[0].fd); fseek(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; } } } /* 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) { /* use common file descriptor */ cdd.toc.tracks[cdd.toc.last].fd = cdd.toc.tracks[0].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.last && !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 */ fseek(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 + ((ftell(cdd.toc.tracks[cdd.toc.last].fd) + cdd.sectorSize - 1) / cdd.sectorSize); } else { /* AUDIO track length */ 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); } /* 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) { fclose(cdd.toc.tracks[cdd.toc.last].fd); } /* close CUE file */ fclose(fd); } else { int i, offset = 1; /* set pointer at the end of filename */ ptr = fname + strlen(fname) - 4; /* autodetect audio track file extensions */ for (i=0; irate != 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) + 587) / 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; } /* initialize file read offset for current track */ cdd.toc.tracks[cdd.toc.last].offset = cdd.toc.tracks[cdd.toc.last].start * 588; /* auto-detect PAUSE within audio files */ ov_pcm_seek(&cdd.toc.tracks[cdd.toc.last].vf, 100 * 588); #if defined(USE_LIBVORBIS) ov_read(&cdd.toc.tracks[cdd.toc.last].vf, (char *)head, 32, 0, 2, 1, 0); #else ov_read(&cdd.toc.tracks[cdd.toc.last].vf, (char *)head, 32, 0); #endif 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; } /* max. 99 tracks */ if (cdd.toc.last == 99) break; /* try to open next audio track file */ sprintf(ptr, extensions[i], cdd.toc.last + offset); fd = fopen(fname, "rb"); } } /* CD tracks found ? */ if (cdd.toc.last) { /* Lead-out */ cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end; /* CD mounted */ cdd.loaded = 1; /* Valid DATA track found ? */ if (cdd.toc.tracks[0].type) { /* 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)); } } } /* Automatically try to open associated subcode data file */ strncpy(&fname[strlen(fname) - 4], ".sub", 4); cdd.toc.sub = fopen(fname, "rb"); /* return 1 if loaded file is CD image file */ return (isCDfile); } /* no CD image file loaded */ return 0; } void cdd_unload(void) { if (cdd.loaded) { int i; /* close CD tracks */ for (i=0; i 0) && (cdd.toc.tracks[i].fd == cdd.toc.tracks[i-1].fd)) { /* skip track */ i++; } else { /* close file */ fclose(cdd.toc.tracks[i].fd); } } } /* close any opened subcode file */ if (cdd.toc.sub) fclose(cdd.toc.sub); /* CD unloaded */ cdd.loaded = 0; } /* reset TOC */ memset(&cdd.toc, 0x00, sizeof(cdd.toc)); /* no CD-ROM track */ cdd.sectorSize = 0; } void cdd_read_data(uint8 *dst) { /* only allow reading (first) CD-ROM track sectors */ if (cdd.toc.tracks[cdd.index].type && (cdd.lba >= 0)) { /* seek current track sector */ if (cdd.sectorSize == 2048) { /* Mode 1 COOKED data (ISO) */ fseek(cdd.toc.tracks[0].fd, cdd.lba * 2048, SEEK_SET); } else { /* Mode 1 RAW data (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 */ #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) if (cdd.toc.tracks[cdd.index].vf.datasource) { int len, done = 0; int16 *ptr = (int16 *) (cdc.ram); samples = samples * 4; while (done < samples) { #ifdef USE_LIBVORBIS len = ov_read(&cdd.toc.tracks[cdd.index].vf, (char *)(cdc.ram + done), samples - done, 0, 2, 1, 0); #else len = ov_read(&cdd.toc.tracks[cdd.index].vf, (char *)(cdc.ram + done), samples - done, 0); #endif if (len <= 0) { done = samples; break; } done += len; } samples = done / 4; /* process 16-bit (host-endian) stereo samples */ for (i=0; i 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 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); } static void cdd_read_subcode(void) { uint8 subc[96]; int i,j,index; /* update subcode buffer pointer address */ scd.regs[0x68>>1].byte.l = (scd.regs[0x68>>1].byte.l + 98) & 0x7e; /* 16-bit register index */ index = (scd.regs[0x68>>1].byte.l + 0x100) >> 1; /* read interleaved subcode data from .sub file (12 x 8-bit of P subchannel first, then Q subchannel, etc) */ fread(subc, 1, 96, cdd.toc.sub); /* convert back to raw subcode format (96 bytes with 8 x P-W subchannel bits per byte) */ for (i=0; i<96; i+=2) { int code = 0; for (j=0; j<8; j++) { int bits = (subc[(j*12)+(i/8)] >> (6 - (i & 6))) & 3; code |= ((bits & 1) << (7 - j)); code |= ((bits >> 1) << (15 - j)); } /* subcode buffer is accessed as 16-bit words */ scd.regs[index].w = code; /* subcode buffer is limited to 64 x 16-bit words */ index = (index + 1) & 0xbf; } /* level 6 interrupt enabled ? */ if (scd.regs[0x32>>1].byte.l & 0x40) { /* trigger level 6 interrupt */ scd.pending |= (1 << 6); /* update IRQ level */ s68k_update_irq((scd.pending & scd.regs[0x32>>1].byte.l) >> 1); } } 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_PAUSE; } /* reading disc */ else if (cdd.status == CD_PLAY) { /* drive latency */ if (cdd.latency > 0) { cdd.latency--; return; } /* end of disc detection */ if (cdd.index >= cdd.toc.last) { cdd.status = CD_END; return; } /* subcode data processing */ if (cdd.toc.sub) { cdd_read_subcode(); } /* track type */ if (cdd.toc.tracks[cdd.index].type) { /* CD-ROM (Mode 1) sector header */ 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; /* decode CD-ROM track sector */ cdc_decoder_update(*(uint32 *)(header)); } else { /* 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); } /* read next sector */ cdd.lba++; /* check end of current track */ if (cdd.lba >= cdd.toc.tracks[cdd.index].end) { #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) #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 */ #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) 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].start * 588) - 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) { #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) #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++; /* check disc limits */ if (cdd.index < cdd.toc.last) { /* skip directly to next track start position */ cdd.lba = cdd.toc.tracks[cdd.index].start; } else { /* end of disc */ cdd.lba = cdd.toc.end; cdd.status = CD_END; /* no AUDIO track playing */ scd.regs[0x36>>1].byte.h = 0x01; return; } } else if (cdd.lba < cdd.toc.tracks[cdd.index].start) { #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) #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 /* check disc limits */ if (cdd.index > 0) { /* previous track */ cdd.index--; /* skip directly to previous track end position */ cdd.lba = cdd.toc.tracks[cdd.index].end; } else { /* start of first track */ cdd.lba = 0; } } /* AUDIO track playing ? */ scd.regs[0x36>>1].byte.h = cdd.toc.tracks[cdd.index].type; /* seek to current subcode position */ if (cdd.toc.sub) { fseek(cdd.toc.sub, cdd.lba * 96, SEEK_SET); } /* seek to current track position */ if (cdd.toc.tracks[cdd.index].type) { /* DATA track */ fseek(cdd.toc.tracks[0].fd, cdd.lba * cdd.sectorSize, SEEK_SET); } #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) 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 * 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 (drive busy ?) in RS0 once */ scd.regs[0x38>>1].w = CD_BUSY << 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_BUSY & 0x0f; 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.toc.tracks[cdd.index].type << 2; /* 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.toc.tracks[cdd.index].type << 2; /* 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[0x3e>>1].byte.h |= (cdd.toc.tracks[track-1].type << 3); /* RS6 bit 3 is set for CD-ROM track */ scd.regs[0x40>>1].byte.h = track % 10; /* Track Number (low digit) */ 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, Earnest Evans, Road Avenger & Time Gal) need at least 10 interrupts delay */ /* Space Adventure Cobra (2nd morgue scene) needs at least 13 interrupts delay (incl. seek time, so 10 is 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++; #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(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 subcode position */ if (cdd.toc.sub) { fseek(cdd.toc.sub, lba * 96, SEEK_SET); } /* seek to current track position */ if (cdd.toc.tracks[index].type) { /* DATA track */ fseek(cdd.toc.tracks[0].fd, lba * cdd.sectorSize, SEEK_SET); } #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) else if (cdd.toc.tracks[index].vf.seekable) { /* VORBIS AUDIO track */ ov_pcm_seek(&cdd.toc.tracks[index].vf, (lba * 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++; #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(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 (cdd.toc.tracks[index].type) { /* DATA track */ fseek(cdd.toc.tracks[0].fd, lba * cdd.sectorSize, SEEK_SET); } #if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) else if (cdd.toc.tracks[index].vf.seekable) { /* VORBIS AUDIO track */ ov_pcm_seek(&cdd.toc.tracks[index].vf, (lba * 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); } /* seek to current subcode position */ if (cdd.toc.sub) { fseek(cdd.toc.sub, lba * 96, 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_PAUSE; 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_PAUSE; 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 (drive busy ?) in RS0 once */ scd.regs[0x38>>1].w = CD_BUSY << 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_BUSY & 0x0f; #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; }