--- /dev/null
+/***************************************************************************************
+ * 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 "cue.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
+};
+
+/* 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
+};
+
+#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 = 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;
+}
+
+/* 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");
+
+ /* 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;
+ return 0;
+}
+
+int cdd_unload(void)
+{
+ int was_loaded = cdd.loaded;
+
+ if (cdd.loaded)
+ {
+ int i;
+
+ /* close CD tracks */
+ if (cdd.toc.tracks[0].fd)
+ {
+ pm_close(cdd.toc.tracks[0].fd);
+ cdd.toc.tracks[0].fd = 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[0].fd);
+
+ /* detect single file images */
+ if (cdd.toc.tracks[i+1].fd == cdd.toc.tracks[i].fd)
+ {
+ /* exit loop */
+ i = cdd.toc.last;
+ }
+ }
+ }
+
+ /* CD unloaded */
+ cdd.loaded = 0;
+ }
+
+ /* reset TOC */
+ memset(&cdd.toc, 0x00, sizeof(cdd.toc));
+
+ /* unknown CD image file format */
+ cdd.sectorSize = 0;
+
+ 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->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 = 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
+
+ /* seeking disc */
+ if (cdd.status == CD_SEEK)
+ {
+ /* drive latency */
+ if (cdd.latency > 0)
+ {
+ cdd.latency--;
+ return;
+ }
+
+ /* drive is ready */
+ cdd.status = CD_READY;
+ }
+
+ /* reading disc */
+ else if (cdd.status == CD_PLAY)
+ {
+ /* drive latency */
+ if (cdd.latency > 0)
+ {
+ cdd.latency--;
+ return;
+ }
+
+ /* track type */
+ if (!cdd.index)
+ {
+ /* DATA sector header (CD-ROM Mode 1) */
+ uint8 header[4];
+ uint32 msf = cdd.lba + 150;
+ header[0] = lut_BCD_8[(msf / 75) / 60];
+ header[1] = lut_BCD_8[(msf / 75) % 60];
+ header[2] = lut_BCD_8[(msf % 75)];
+ header[3] = 0x01;
+
+ /* data track sector read is controlled by CDC */
+ cdd.lba += cdc_decoder_update(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->regs[0x36>>1].byte.h = 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->regs[0x36>>1].byte.h = 0x01;
+
+ /* seek to next audio track start */
+#ifdef USE_LIBTREMOR
+ if (cdd.toc.tracks[cdd.index].vf.seekable)
+ {
+#ifdef DISABLE_MANY_OGG_OPEN_FILES
+ /* VORBIS file need to be opened first */
+ ov_open(cdd.toc.tracks[cdd.index].fd,&cdd.toc.tracks[cdd.index].vf,0,0);
+#endif
+ ov_pcm_seek(&cdd.toc.tracks[cdd.index].vf, -cdd.toc.tracks[cdd.index].offset);
+ }
+ else
+#endif
+#if 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->regs[0x36>>1].byte.h = 0x00;
+ }
+ }
+ else if (cdd.lba < cdd.toc.tracks[cdd.index].start)
+ {
+#ifdef USE_LIBTREMOR
+#ifdef DISABLE_MANY_OGG_OPEN_FILES
+ /* close previous track VORBIS file structure to save memory */
+ if (cdd.toc.tracks[cdd.index].vf.datasource)
+ {
+ ogg_free(cdd.index);
+ }
+#endif
+#endif
+
+ /* previous track */
+ cdd.index--;
+
+ /* skip directly to track end position */
+ cdd.lba = cdd.toc.tracks[cdd.index].end;
+ }
+
+ /* check disc limits */
+ if (cdd.index < 0)
+ {
+ cdd.index = 0;
+ cdd.lba = 0;
+ }
+ else if (cdd.index >= cdd.toc.last)
+ {
+ /* no AUDIO track playing */
+ Pico_mcd->regs[0x36>>1].byte.h = 0x01;
+
+ /* end of disc */
+ cdd.index = cdd.toc.last;
+ cdd.lba = cdd.toc.end;
+ cdd.status = CD_END;
+ return;
+ }
+
+ /* seek to current block */
+ if (!cdd.index)
+ {
+ /* no AUDIO track playing */
+ Pico_mcd->regs[0x36>>1].byte.h = 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->regs[0x42>>1].byte.h & 0x0f)
+ {
+ case 0x00: /* Drive Status */
+ {
+ /* RS1-RS8 normally unchanged */
+ Pico_mcd->regs[0x38>>1].byte.h = cdd.status;
+
+ /* unless RS1 indicated invalid track infos */
+ if (Pico_mcd->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) */
+ Pico_mcd->regs[0x38>>1].byte.l = 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->regs[0x36>>1].byte.h = 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 */
+ {
+ /* Infos automatically retrieved by CDD processor from Q-Channel */
+ /* commands 0x00-0x02 (current block) and 0x03-0x05 (Lead-In) */
+ switch (Pico_mcd->regs[0x44>>1].byte.l)
+ {
+ 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->regs[0x40>>1].byte.h = cdd.index ? 0x00 : 0x04; /* Current block flags in RS8 (bit0 = mute status, bit1: pre-emphasis status, bit2: track type) */
+ break;
+ }
+
+ case 0x01: /* Current Track Relative Time (MM:SS:FF) */
+ {
+ int lba = cdd.lba - cdd.toc.tracks[cdd.index].start;
+ 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->regs[0x40>>1].byte.h = cdd.index ? 0x00 : 0x04; /* Current block flags in RS8 (bit0 = mute status, bit1: pre-emphasis status, bit2: track type) */
+ break;
+ }
+
+ case 0x02: /* Current Track Number */
+ {
+ 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->regs[0x40>>1].byte.h = 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->regs[0x40>>1].byte.h = 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->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 = Pico_mcd->regs[0x46>>1].byte.h * 10 + Pico_mcd->regs[0x46>>1].byte.l;
+ 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->regs[0x40>>1].byte.h = track % 10; /* Track Number (low digit) */
+ if (track == 1)
+ {
+ /* RS6 bit 3 is set for the first (DATA) track */
+ Pico_mcd->regs[0x3e>>1].byte.h |= 0x08;
+ }
+ break;
+ }
+
+ default:
+ {
+#ifdef LOG_ERROR
+ error("Unknown CDD Command %02X (%X)\n", Pico_mcd->regs[0x44>>1].byte.l, s68k.pc);
+#endif
+ return;
+ }
+ }
+ break;
+ }
+
+ case 0x03: /* Play */
+ {
+ /* reset track index */
+ int index = 0;
+
+ /* new LBA position */
+ int lba = ((Pico_mcd->regs[0x44>>1].byte.h * 10 + Pico_mcd->regs[0x44>>1].byte.l) * 60 +
+ (Pico_mcd->regs[0x46>>1].byte.h * 10 + Pico_mcd->regs[0x46>>1].byte.l)) * 75 +
+ (Pico_mcd->regs[0x48>>1].byte.h * 10 + Pico_mcd->regs[0x48>>1].byte.l) - 150;
+
+ /* CD drive latency */
+ if (!cdd.latency)
+ {
+ /* Fixes a few games hanging during intro because they expect data to be read with some delay */
+ /* Radical Rex needs at least one interrupt delay */
+ /* Wolf Team games (Anet Futatabi, Cobra Command, Road Avenger & Time Gal) need at least 6 interrupts delay */
+ /* Space Adventure Cobra (2nd morgue scene) needs at least 13 interrupts delay (incl. seek time, so 6 is OK) */
+ /* Jeopardy & ESPN Sunday Night NFL are picky about this as well: 10 interrupts delay (+ seek time) seems OK */
+ cdd.latency = 10;
+ }
+
+ /* CD drive seek time */
+ /* max. seek time = 1.5 s = 1.5 x 75 = 112.5 CDD interrupts (rounded to 120) for 270000 sectors max on disc. */
+ /* Note: This is only a rough approximation since, on real hardware, seek time is much likely not linear and */
+ /* latency much larger than above value, but this model works fine for Sonic CD (track 26 playback needs to */
+ /* be enough delayed to start in sync with intro sequence, as compared with real hardware recording). */
+ if (lba > cdd.lba)
+ {
+ cdd.latency += (((lba - cdd.lba) * 120) / 270000);
+ }
+ else
+ {
+ cdd.latency += (((cdd.lba - lba) * 120) / 270000);
+ }
+
+ /* update current LBA */
+ cdd.lba = lba;
+
+ /* get track index */
+ while ((cdd.toc.tracks[index].end <= lba) && (index < cdd.toc.last)) index++;
+
+#ifdef USE_LIBTREMOR
+#ifdef DISABLE_MANY_OGG_OPEN_FILES
+ /* check if track index has changed */
+ if (index != cdd.index)
+ {
+ /* close previous track VORBIS file structure to save memory */
+ if (cdd.toc.tracks[cdd.index].vf.datasource)
+ {
+ ogg_free(cdd.index);
+ }
+
+ /* open current track VORBIS file */
+ if (cdd.toc.tracks[index].vf.seekable)
+ {
+ ov_open(cdd.toc.tracks[index].fd,&cdd.toc.tracks[index].vf,0,0);
+ }
+ }
+#endif
+#endif
+
+ /* update current track index */
+ cdd.index = index;
+
+ /* stay within track limits when seeking files */
+ if (lba < cdd.toc.tracks[index].start)
+ {
+ lba = cdd.toc.tracks[index].start;
+ }
+
+ /* seek to current block */
+ if (!index)
+ {
+ /* DATA track */
+ 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->regs[0x36>>1].byte.h = 0x01;
+
+ /* update status */
+ cdd.status = CD_PLAY;
+
+ /* return track index in RS2-RS3 */
+ set_reg16(0x38, (CD_PLAY << 8) | 0x02);
+ set_reg16(0x3a, (cdd.index < cdd.toc.last) ? lut_BCD_16[index + 1] : 0x0A0A);
+ set_reg16(0x3c, 0x0000);
+ set_reg16(0x3e, 0x0000);
+ Pico_mcd->regs[0x40>>1].byte.h = 0x00;
+ break;
+ }
+
+ case 0x04: /* Seek */
+ {
+ /* reset track index */
+ int index = 0;
+
+ /* new LBA position */
+ int lba = ((Pico_mcd->regs[0x44>>1].byte.h * 10 + Pico_mcd->regs[0x44>>1].byte.l) * 60 +
+ (Pico_mcd->regs[0x46>>1].byte.h * 10 + Pico_mcd->regs[0x46>>1].byte.l)) * 75 +
+ (Pico_mcd->regs[0x48>>1].byte.h * 10 + Pico_mcd->regs[0x48>>1].byte.l) - 150;
+
+ /* CD drive seek time */
+ /* We are using similar linear model as above, although still not exactly accurate, */
+ /* it works fine for Switch/Panic! intro (Switch needs at least 30 interrupts while */
+ /* seeking from 00:05:63 to 24:03:19, Panic! when seeking from 00:05:60 to 24:06:07) */
+ if (lba > cdd.lba)
+ {
+ cdd.latency = ((lba - cdd.lba) * 120) / 270000;
+ }
+ else
+ {
+ cdd.latency = ((cdd.lba - lba) * 120) / 270000;
+ }
+
+ /* update current LBA */
+ cdd.lba = lba;
+
+ /* get current track index */
+ while ((cdd.toc.tracks[index].end <= lba) && (index < cdd.toc.last)) index++;
+
+#ifdef USE_LIBTREMOR
+#ifdef DISABLE_MANY_OGG_OPEN_FILES
+ /* check if track index has changed */
+ if (index != cdd.index)
+ {
+ /* close previous track VORBIS file structure to save memory */
+ if (cdd.toc.tracks[cdd.index].vf.datasource)
+ {
+ ogg_free(cdd.index);
+ }
+
+ /* open current track VORBIS file */
+ if (cdd.toc.tracks[index].vf.seekable)
+ {
+ ov_open(cdd.toc.tracks[index].fd,&cdd.toc.tracks[index].vf,0,0);
+ }
+ }
+#endif
+#endif
+
+ /* update current track index */
+ cdd.index = index;
+
+ /* stay within track limits */
+ if (lba < cdd.toc.tracks[index].start)
+ {
+ lba = cdd.toc.tracks[index].start;
+ }
+
+ /* seek to current block */
+ if (!index)
+ {
+ /* DATA track */
+ 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);
+ }
+#endif
+
+ /* no audio track playing */
+ Pico_mcd->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) */
+ 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->regs[0x36>>1].byte.h = 0x01;
+
+ /* update status (RS1-RS8 unchanged) */
+ cdd.status = Pico_mcd->regs[0x38>>1].byte.h = CD_READY;
+ break;
+ }
+
+ case 0x07: /* Resume */
+ {
+ /* update status (RS1-RS8 unchanged) */
+ cdd.status = Pico_mcd->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 = Pico_mcd->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 = Pico_mcd->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 */
+ Pico_mcd->regs[0x36>>1].byte.h = 0x01;
+
+ /* update status (RS1-RS8 unchanged) */
+ cdd.status = Pico_mcd->regs[0x38>>1].byte.h = CD_READY;
+ break;
+ }
+
+ case 0x0c: /* Close Tray */
+ {
+ /* no audio track playing */
+ Pico_mcd->regs[0x36>>1].byte.h = 0x01;
+
+ /* update status */
+ cdd.status = cdd.loaded ? CD_STOP : NO_DISC;
+
+ /* RS1-RS8 ignored, expects 0x0 ("no disc" ?) in RS0 once */
+ set_reg16(0x38, 0x0000);
+ set_reg16(0x3a, 0x0000);
+ set_reg16(0x3c, 0x0000);
+ set_reg16(0x3e, 0x0000);
+ set_reg16(0x40, 0x000f);
+
+ if (PicoMCDcloseTray)
+ PicoMCDcloseTray();
+ return;
+ }
+
+ case 0x0d: /* Open Tray */
+ {
+ /* no audio track playing */
+ Pico_mcd->regs[0x36>>1].byte.h = 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 (PicoMCDopenTray)
+ PicoMCDopenTray();
+ return;
+ }
+
+ default: /* Unknown command */
+#ifdef LOG_CDD
+ error("Unknown CDD Command !!!\n");
+#endif
+ Pico_mcd->regs[0x38>>1].byte.h = cdd.status;
+ break;
+ }
+
+ /* only compute checksum when necessary */
+ Pico_mcd->regs[0x40>>1].byte.l =
+ ~(Pico_mcd->regs[0x38>>1].byte.h + Pico_mcd->regs[0x38>>1].byte.l +
+ Pico_mcd->regs[0x3a>>1].byte.h + Pico_mcd->regs[0x3a>>1].byte.l +
+ Pico_mcd->regs[0x3c>>1].byte.h + Pico_mcd->regs[0x3c>>1].byte.l +
+ Pico_mcd->regs[0x3e>>1].byte.h + Pico_mcd->regs[0x3e>>1].byte.l +
+ Pico_mcd->regs[0x40>>1].byte.h) & 0x0f;
+}
+
+// vim:shiftwidth=2:ts=2:expandtab
notaz.gp2x.de / picodrive.git / blobdiff