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- /***************************************************************************************
- * Genesis Plus
- * CD drive processor & CD-DA fader
- *
- * Copyright (C) 2012-2013 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 "../pico_int.h"
- #include "genplus_macros.h"
- #include "cd_parse.h"
- #include "cdd.h"
- #ifdef USE_LIBTREMOR
- #define SUPPORTED_EXT 20
- #else
- #define SUPPORTED_EXT 10
- #endif
- cdd_t cdd;
- /* 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
- };
- #if 0
- /* 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
- };
- #endif
- #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_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 = NO_DISC;
- /* reset CD-DA fader (full volume) */
- cdd.volume = 0x400;
- /* clear CD-DA output */
- cdd.audio[0] = cdd.audio[1] = 0;
- }
- /* FIXME: use cdd_read_audio() instead */
- static void cdd_change_track(int index, int lba)
- {
- int i, base, lba_offset, lb_len;
- for (i = index; i > 0; i--)
- if (cdd.toc.tracks[i].fd != NULL)
- break;
- Pico_mcd->cdda_stream = cdd.toc.tracks[i].fd;
- base = cdd.toc.tracks[index].offset;
- lba_offset = lba - cdd.toc.tracks[index].start;
- lb_len = cdd.toc.tracks[index].end - cdd.toc.tracks[index].start;
- elprintf(EL_CD, "play #%d lba %d base %d", index, lba, base);
- cdda_start_play(base, lba_offset, lb_len);
- }
- 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)
- {
- pm_seek(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
- #if 0
- 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);
- }
- #else
- else
- {
- cdd_change_track(cdd.index, lba);
- }
- #endif
- return bufferptr;
- }
- int cdd_context_load_old(uint8 *state)
- {
- memcpy(&cdd.lba, state + 8, sizeof(cdd.lba));
- return 12 * 4;
- }
- int cdd_load(const char *filename, int type)
- {
- char header[0x210];
- int ret;
- /* first unmount any loaded disc */
- cdd_unload();
- /* genplus parses cue here, in PD we use our own parser */
- ret = load_cd_image(filename, &type);
- if (ret != 0)
- return ret;
- /* read first 16 bytes */
- pm_read(header, 0x10, cdd.toc.tracks[0].fd);
- /* look for valid CD image ID string */
- if (memcmp("SEGADISCSYSTEM", header, 14))
- {
- /* if not found, read next 16 bytes */
- pm_read(header, 0x10, cdd.toc.tracks[0].fd);
- /* look again for valid CD image ID string */
- if (memcmp("SEGADISCSYSTEM", header, 14))
- {
- elprintf(EL_STATUS|EL_ANOMALY, "cd: bad cd image?");
- /* assume bin without security code */
- }
- /* BIN format (2352 bytes data blocks) */
- cdd.sectorSize = 2352;
- }
- else
- {
- /* ISO format (2048 bytes data blocks) */
- cdd.sectorSize = 2048;
- }
- ret = (type == CT_BIN) ? 2352 : 2048;
- if (ret != cdd.sectorSize)
- elprintf(EL_STATUS|EL_ANOMALY, "cd: type detection mismatch");
- pm_sectorsize(cdd.sectorSize, cdd.toc.tracks[0].fd);
- /* read CD image header + security code */
- pm_read(header + 0x10, 0x200, cdd.toc.tracks[0].fd);
- /* 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);
- }
- #if 0
- 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));
- }
- #endif
- }
- /* Lead-out */
- cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end;
- /* CD loaded */
- cdd.loaded = 1;
- /* disc not scanned yet */
- cdd.status = NO_DISC;
- return 0;
- }
- int cdd_unload(void)
- {
- int was_loaded = cdd.loaded;
- if (cdd.loaded)
- {
- int i;
- /* stop audio streaming */
- Pico_mcd->cdda_stream = NULL;
- /* close CD tracks */
- if (cdd.toc.tracks[0].fd)
- {
- pm_close(cdd.toc.tracks[0].fd);
- cdd.toc.tracks[0].fd = NULL;
- if (cdd.toc.tracks[0].fname)
- free(cdd.toc.tracks[0].fname);
- cdd.toc.tracks[0].fname = NULL;
- }
- for (i = 1; 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 */
- if (Pico_mcd->cdda_type == CT_MP3)
- fclose(cdd.toc.tracks[i].fd);
- else
- pm_close(cdd.toc.tracks[i].fd);
- cdd.toc.tracks[i].fd = NULL;
- if (cdd.toc.tracks[i].fname)
- free(cdd.toc.tracks[i].fname);
- cdd.toc.tracks[i].fname = NULL;
- /* 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;
- if (cdd.status != CD_OPEN)
- cdd.status = NO_DISC;
- }
- /* reset TOC */
- memset(&cdd.toc, 0x00, sizeof(cdd.toc));
-
- /* unknown CD image file format */
- cdd.sectorSize = 0;
- return was_loaded;
- }
- 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 */
- pm_seek(cdd.toc.tracks[0].fd, cdd.lba * 2352 + 16, SEEK_SET);
- }
- /* read sector data (Mode 1 = 2048 bytes) */
- pm_read(dst, 2048, cdd.toc.tracks[0].fd);
- }
- }
- #if 0
- 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(blip[0], samples);
- /* audio track playing ? */
- if (!Pico_mcd->s68k_regs[0x36+0] && 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 = Pico_mcd->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(blip[0], i, delta);
- /* right channel */
- delta = ((ptr[0] * mul) / 1024) - r;
- ptr++;
- r += delta;
- blip_add_delta_fast(blip[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(blip[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(blip[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(blip[0], 0, -l);
- if (r) blip_add_delta_fast(blip[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(blip[0], samples);
- blip_end_frame(blip[1], samples);
- }
- #endif
- void cdd_update(void)
- {
- #ifdef LOG_CDD
- error("LBA = %d (track n°%d)(latency=%d)\n", cdd.lba, cdd.index, cdd.latency);
- #endif
-
- /* drive latency */
- if (cdd.latency > 0)
- {
- cdd.latency--;
- return;
- }
- /* reading disc */
- if (cdd.status == CD_PLAY)
- {
- /* 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(header);
- }
- else if (cdd.index < cdd.toc.last)
- {
- uint8 header[4] = { 0, };
- /* check against audio track start index */
- if (cdd.lba >= cdd.toc.tracks[cdd.index].start)
- {
- /* audio track playing */
- Pico_mcd->s68k_regs[0x36+0] = 0x00;
- }
- /* audio blocks are still sent to CDC as well as CD DAC/Fader */
- cdc_decoder_update(header);
-
- /* 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 */
- Pico_mcd->s68k_regs[0x36+0] = 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 0
- 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);
- }
- #else
- {
- cdd_change_track(cdd.index, cdd.lba);
- }
- #endif
- }
- }
- /* 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)
- {
- Pico_mcd->s68k_regs[0x36+0] = 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 */
- Pico_mcd->s68k_regs[0x36+0] = 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 */
- Pico_mcd->s68k_regs[0x36+0] = 0x01;
- /* DATA track */
- pm_seek(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
- #if 0
- 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);
- }
- #else
- else
- {
- cdd_change_track(cdd.index, cdd.lba);
- }
- #endif
- }
- }
- #define set_reg16(r, v) { \
- uint16 _v = v; \
- Pico_mcd->s68k_regs[(r)] = _v >> 8; \
- Pico_mcd->s68k_regs[(r)+1] = _v; \
- }
- void cdd_process(void)
- {
- /* Process CDD command */
- switch (Pico_mcd->s68k_regs[0x42+0] & 0x0f)
- {
- case 0x00: /* Drive Status */
- {
- if (cdd.latency <= 3) {
- /* RS1-RS8 normally unchanged */
- Pico_mcd->s68k_regs[0x38+0] = cdd.status;
- /* unless RS1 indicated invalid track infos */
- if (Pico_mcd->s68k_regs[0x38+1] == 0x0f)
- {
- /* then return valid track infos, e.g current track number in RS2-RS3 (fixes Lunar - The Silver Star) */
- Pico_mcd->s68k_regs[0x38+1] = 0x02;
- set_reg16(0x3a, (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 */
- Pico_mcd->s68k_regs[0x36+0] = 0x01;
- /* RS1-RS8 ignored, expects 0x0 ("no disc" ?) in RS0 once */
- set_reg16(0x38, 0x0000);
- set_reg16(0x3a, 0x0000);
- set_reg16(0x3c, 0x0000);
- set_reg16(0x3e, 0x0000);
- set_reg16(0x40, 0x000f);
- return;
- }
- case 0x02: /* Read TOC */
- {
- if (cdd.status == NO_DISC)
- cdd.status = cdd.loaded ? CD_STOP : NO_DISC;
- /* Infos automatically retrieved by CDD processor from Q-Channel */
- /* commands 0x00-0x02 (current block) and 0x03-0x05 (Lead-In) */
- switch (Pico_mcd->s68k_regs[0x44+1])
- {
- case 0x00: /* Current Absolute Time (MM:SS:FF) */
- {
- int lba = cdd.lba + 150;
- set_reg16(0x38, cdd.status << 8);
- set_reg16(0x3a, lut_BCD_16[(lba/75)/60]);
- set_reg16(0x3c, lut_BCD_16[(lba/75)%60]);
- set_reg16(0x3e, lut_BCD_16[(lba%75)]);
- Pico_mcd->s68k_regs[0x40+0] = 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;
- if (lba < 0) lba = 0;
- set_reg16(0x38, (cdd.status << 8) | 0x01);
- set_reg16(0x3a, lut_BCD_16[(lba/75)/60]);
- set_reg16(0x3c, lut_BCD_16[(lba/75)%60]);
- set_reg16(0x3e, lut_BCD_16[(lba%75)]);
- Pico_mcd->s68k_regs[0x40+0] = 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 */
- {
- set_reg16(0x38, (cdd.status << 8) | 0x02);
- set_reg16(0x3a, (cdd.index < cdd.toc.last) ? lut_BCD_16[cdd.index + 1] : 0x0A0A);
- set_reg16(0x3c, 0x0000);
- set_reg16(0x3e, 0x0000); /* Disk Control Code (?) in RS6 */
- Pico_mcd->s68k_regs[0x40+0] = 0x00;
- break;
- }
- case 0x03: /* Total length (MM:SS:FF) */
- {
- int lba = cdd.toc.end + 150;
- set_reg16(0x38, (cdd.status << 8) | 0x03);
- set_reg16(0x3a, lut_BCD_16[(lba/75)/60]);
- set_reg16(0x3c, lut_BCD_16[(lba/75)%60]);
- set_reg16(0x3e, lut_BCD_16[(lba%75)]);
- Pico_mcd->s68k_regs[0x40+0] = 0x00;
- break;
- }
- case 0x04: /* First & Last Track Numbers */
- {
- set_reg16(0x38, (cdd.status << 8) | 0x04);
- set_reg16(0x3a, 0x0001);
- set_reg16(0x3c, lut_BCD_16[cdd.toc.last]);
- set_reg16(0x3e, 0x0000); /* Drive Version (?) in RS6-RS7 */
- Pico_mcd->s68k_regs[0x40+0] = 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 = Pico_mcd->s68k_regs[0x46+0] * 10 + Pico_mcd->s68k_regs[0x46+1];
- int lba = cdd.toc.tracks[track-1].start + 150;
- set_reg16(0x38, (cdd.status << 8) | 0x05);
- set_reg16(0x3a, lut_BCD_16[(lba/75)/60]);
- set_reg16(0x3c, lut_BCD_16[(lba/75)%60]);
- set_reg16(0x3e, lut_BCD_16[(lba%75)]);
- Pico_mcd->s68k_regs[0x40+0] = track % 10; /* Track Number (low digit) */
- if (track == 1)
- {
- /* RS6 bit 3 is set for the first (DATA) track */
- Pico_mcd->s68k_regs[0x3e + 0] |= 0x08;
- }
- break;
- }
- default:
- {
- #ifdef LOG_ERROR
- error("Unknown CDD Command %02X (%X)\n", Pico_mcd->s68k_regs[0x44+1], s68k.pc);
- #endif
- return;
- }
- }
- break;
- }
- case 0x03: /* Play */
- {
- /* reset track index */
- int index = 0;
- /* new LBA position */
- int lba = ((Pico_mcd->s68k_regs[0x44+0] * 10 + Pico_mcd->s68k_regs[0x44+1]) * 60 +
- (Pico_mcd->s68k_regs[0x46+0] * 10 + Pico_mcd->s68k_regs[0x46+1])) * 75 +
- (Pico_mcd->s68k_regs[0x48+0] * 10 + Pico_mcd->s68k_regs[0x48+1]) - 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 */
- pm_seek(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
- #if 0
- 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);
- }
- #else
- else
- {
- cdd_change_track(index, lba);
- }
- #endif
- /* no audio track playing (yet) */
- Pico_mcd->s68k_regs[0x36+0] = 0x01;
- /* update status */
- cdd.status = CD_PLAY;
- /* return track index in RS2-RS3 */
- set_reg16(0x38, (CD_SEEK << 8) | 0x0f);
- set_reg16(0x3a, 0x0000);
- set_reg16(0x3c, 0x0000);
- set_reg16(0x3e, 0x0000);
- set_reg16(0x40, ~(CD_SEEK + 0xf) & 0x0f);
- break;
- }
- case 0x04: /* Seek */
- {
- /* reset track index */
- int index = 0;
- /* new LBA position */
- int lba = ((Pico_mcd->s68k_regs[0x44+0] * 10 + Pico_mcd->s68k_regs[0x44+1]) * 60 +
- (Pico_mcd->s68k_regs[0x46+0] * 10 + Pico_mcd->s68k_regs[0x46+1])) * 75 +
- (Pico_mcd->s68k_regs[0x48+0] * 10 + Pico_mcd->s68k_regs[0x48+1]) - 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 */
- pm_seek(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
- #if 0
- 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);
- }
- #else
- else
- {
- cdd_change_track(index, lba);
- }
- #endif
- /* no audio track playing */
- Pico_mcd->s68k_regs[0x36+0] = 0x01;
- /* update status */
- cdd.status = CD_READY;
- /* 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) */
- set_reg16(0x38, (CD_SEEK << 8) | 0x0f);
- set_reg16(0x3a, 0x0000);
- set_reg16(0x3c, 0x0000);
- set_reg16(0x3e, 0x0000);
- set_reg16(0x40, ~(CD_SEEK + 0xf) & 0x0f);
- return;
- }
- case 0x06: /* Pause */
- {
- /* no audio track playing */
- Pico_mcd->s68k_regs[0x36+0] = 0x01;
- /* update status (RS1-RS8 unchanged) */
- cdd.status = Pico_mcd->s68k_regs[0x38+0] = CD_READY;
- break;
- }
- case 0x07: /* Resume */
- {
- /* update status (RS1-RS8 unchanged) */
- cdd.status = Pico_mcd->s68k_regs[0x38+0] = CD_PLAY;
- break;
- }
- case 0x08: /* Forward Scan */
- {
- /* reset scanning direction / speed */
- cdd.scanOffset = CD_SCAN_SPEED;
- /* update status (RS1-RS8 unchanged) */
- cdd.status = Pico_mcd->s68k_regs[0x38+0] = CD_SCAN;
- break;
- }
- case 0x09: /* Rewind Scan */
- {
- /* reset scanning direction / speed */
- cdd.scanOffset = -CD_SCAN_SPEED;
- /* update status (RS1-RS8 unchanged) */
- cdd.status = Pico_mcd->s68k_regs[0x38+0] = 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 */
- Pico_mcd->s68k_regs[0x36+0] = 0x01;
- /* update status (RS1-RS8 unchanged) */
- cdd.status = Pico_mcd->s68k_regs[0x38+0] = CD_READY;
- break;
- }
- case 0x0c: /* Close Tray */
- {
- /* no audio track playing */
- Pico_mcd->s68k_regs[0x36+0] = 0x01;
- /* update status */
- cdd.status = cdd.loaded ? CD_STOP : NO_DISC;
- /* RS1-RS8 ignored, expects 0x0 ("no disc" ?) in RS0 once */
- set_reg16(0x38, 0x0000);
- set_reg16(0x3a, 0x0000);
- set_reg16(0x3c, 0x0000);
- set_reg16(0x3e, 0x0000);
- set_reg16(0x40, 0x000f);
- if (PicoIn.mcdTrayClose)
- PicoIn.mcdTrayClose();
- return;
- }
- case 0x0d: /* Open Tray */
- {
- /* no audio track playing */
- Pico_mcd->s68k_regs[0x36+0] = 0x01;
- /* update status (RS1-RS8 ignored) */
- cdd.status = CD_OPEN;
- set_reg16(0x38, CD_OPEN << 8);
- set_reg16(0x3a, 0x0000);
- set_reg16(0x3c, 0x0000);
- set_reg16(0x3e, 0x0000);
- set_reg16(0x40, ~CD_OPEN & 0x0f);
- if (PicoIn.mcdTrayOpen)
- PicoIn.mcdTrayOpen();
- return;
- }
- default: /* Unknown command */
- #ifdef LOG_CDD
- error("Unknown CDD Command !!!\n");
- #endif
- Pico_mcd->s68k_regs[0x38+0] = cdd.status;
- break;
- }
- /* only compute checksum when necessary */
- Pico_mcd->s68k_regs[0x40 + 1] =
- ~(Pico_mcd->s68k_regs[0x38 + 0] + Pico_mcd->s68k_regs[0x38 + 1] +
- Pico_mcd->s68k_regs[0x3a + 0] + Pico_mcd->s68k_regs[0x3a + 1] +
- Pico_mcd->s68k_regs[0x3c + 0] + Pico_mcd->s68k_regs[0x3c + 1] +
- Pico_mcd->s68k_regs[0x3e + 0] + Pico_mcd->s68k_regs[0x3e + 1] +
- Pico_mcd->s68k_regs[0x40 + 0]) & 0x0f;
- }
- // vim:shiftwidth=2:ts=2:expandtab
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