mirror of
https://github.com/RaySollium99/picodrive.git
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1342 lines
38 KiB
C
1342 lines
38 KiB
C
/***************************************************************************************
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* Genesis Plus
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* CD drive processor & CD-DA fader
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*
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* Copyright (C) 2012-2013 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************************/
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#include "../pico_int.h"
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#include "genplus_macros.h"
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#include "cd_parse.h"
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#include "cdd.h"
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#ifdef USE_LIBTREMOR
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#define SUPPORTED_EXT 20
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#else
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#define SUPPORTED_EXT 10
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#endif
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cdd_t cdd;
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/* BCD conversion lookup tables */
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static const uint8 lut_BCD_8[100] =
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{
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,
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0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
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0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
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0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
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0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
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0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
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0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
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};
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static const uint16 lut_BCD_16[100] =
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{
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0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009,
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0x0100, 0x0101, 0x0102, 0x0103, 0x0104, 0x0105, 0x0106, 0x0107, 0x0108, 0x0109,
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0x0200, 0x0201, 0x0202, 0x0203, 0x0204, 0x0205, 0x0206, 0x0207, 0x0208, 0x0209,
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0x0300, 0x0301, 0x0302, 0x0303, 0x0304, 0x0305, 0x0306, 0x0307, 0x0308, 0x0309,
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0x0400, 0x0401, 0x0402, 0x0403, 0x0404, 0x0405, 0x0406, 0x0407, 0x0408, 0x0409,
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0x0500, 0x0501, 0x0502, 0x0503, 0x0504, 0x0505, 0x0506, 0x0507, 0x0508, 0x0509,
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0x0600, 0x0601, 0x0602, 0x0603, 0x0604, 0x0605, 0x0606, 0x0607, 0x0608, 0x0609,
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0x0700, 0x0701, 0x0702, 0x0703, 0x0704, 0x0705, 0x0706, 0x0707, 0x0708, 0x0709,
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0x0800, 0x0801, 0x0802, 0x0803, 0x0804, 0x0805, 0x0806, 0x0807, 0x0808, 0x0809,
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0x0900, 0x0901, 0x0902, 0x0903, 0x0904, 0x0905, 0x0906, 0x0907, 0x0908, 0x0909,
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};
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/* pre-build TOC */
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static const uint16 toc_snatcher[21] =
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{
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56014, 495, 10120, 20555, 1580, 5417, 12502, 16090, 6553, 9681,
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8148, 20228, 8622, 6142, 5858, 1287, 7424, 3535, 31697, 2485,
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31380
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};
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static const uint16 toc_lunar[52] =
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{
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5422, 1057, 7932, 5401, 6380, 6592, 5862, 5937, 5478, 5870,
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6673, 6613, 6429, 4996, 4977, 5657, 3720, 5892, 3140, 3263,
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6351, 5187, 3249, 1464, 1596, 1750, 1751, 6599, 4578, 5205,
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1550, 1827, 2328, 1346, 1569, 1613, 7199, 4928, 1656, 2549,
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1875, 3901, 1850, 2399, 2028, 1724, 4889, 14551, 1184, 2132,
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685, 3167
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};
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static const uint32 toc_shadow[15] =
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{
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10226, 70054, 11100, 12532, 12444, 11923, 10059, 10167, 10138, 13792,
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11637, 2547, 2521, 3856, 900
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};
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static const uint32 toc_dungeon[13] =
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{
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2250, 22950, 16350, 24900, 13875, 19950, 13800, 15375, 17400, 17100,
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3325, 6825, 25275
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};
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static const uint32 toc_ffight[26] =
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{
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11994, 9742, 10136, 9685, 9553, 14588, 9430, 8721, 9975, 9764,
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9704, 12796, 585, 754, 951, 624, 9047, 1068, 817, 9191, 1024,
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14562, 10320, 8627, 3795, 3047
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};
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static const uint32 toc_ffightj[29] =
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{
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11994, 9752, 10119, 9690, 9567, 14575, 9431, 8731, 9965, 9763,
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9716, 12791, 579, 751, 958, 630, 9050, 1052, 825, 9193, 1026,
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14553, 9834, 10542, 1699, 1792, 1781, 3783, 3052
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};
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#if 0
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/* supported WAVE file header (16-bit stereo samples @44.1kHz) */
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static const unsigned char waveHeader[32] =
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{
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0x57,0x41,0x56,0x45,0x66,0x6d,0x74,0x20,0x10,0x00,0x00,0x00,0x01,0x00,0x02,0x00,
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0x44,0xac,0x00,0x00,0x10,0xb1,0x02,0x00,0x04,0x00,0x10,0x00,0x64,0x61,0x74,0x61
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};
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#endif
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#ifdef USE_LIBTREMOR
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#ifdef DISABLE_MANY_OGG_OPEN_FILES
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static void ogg_free(int i)
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{
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/* clear OGG file descriptor to prevent file from being closed */
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cdd.toc.tracks[i].vf.datasource = NULL;
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/* close VORBIS file structure */
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ov_clear(&cdd.toc.tracks[i].vf);
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/* indicates that the track is a seekable VORBIS file */
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cdd.toc.tracks[i].vf.seekable = 1;
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/* reset file reading position */
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fseek(cdd.toc.tracks[i].fd, 0, SEEK_SET);
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}
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#endif
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#endif
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void cdd_reset(void)
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{
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/* reset cycle counter */
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cdd.cycles = 0;
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/* reset drive access latency */
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cdd.latency = 0;
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/* reset track index */
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cdd.index = 0;
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/* reset logical block address */
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cdd.lba = 0;
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/* reset status */
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cdd.status = NO_DISC;
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/* reset CD-DA fader (full volume) */
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cdd.volume = 0x400;
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/* clear CD-DA output */
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cdd.audio[0] = cdd.audio[1] = 0;
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}
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/* FIXME: use cdd_read_audio() instead */
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static void cdd_change_track(int index, int lba)
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{
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int i, base, lba_offset, lb_len;
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for (i = index; i > 0; i--)
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if (cdd.toc.tracks[i].fd != NULL)
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break;
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Pico_mcd->cdda_stream = cdd.toc.tracks[i].fd;
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base = cdd.toc.tracks[index].offset;
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lba_offset = lba - cdd.toc.tracks[index].start;
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lb_len = cdd.toc.tracks[index].end - cdd.toc.tracks[index].start;
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elprintf(EL_CD, "play #%d lba %d base %d", index, lba, base);
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cdda_start_play(base, lba_offset, lb_len);
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}
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int cdd_context_save(uint8 *state)
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{
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int bufferptr = 0;
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save_param(&cdd.cycles, sizeof(cdd.cycles));
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save_param(&cdd.latency, sizeof(cdd.latency));
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save_param(&cdd.index, sizeof(cdd.index));
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save_param(&cdd.lba, sizeof(cdd.lba));
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save_param(&cdd.scanOffset, sizeof(cdd.scanOffset));
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save_param(&cdd.volume, sizeof(cdd.volume));
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save_param(&cdd.status, sizeof(cdd.status));
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return bufferptr;
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}
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int cdd_context_load(uint8 *state)
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{
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int lba;
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int bufferptr = 0;
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#ifdef USE_LIBTREMOR
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#ifdef DISABLE_MANY_OGG_OPEN_FILES
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/* close previous track VORBIS file structure to save memory */
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if (cdd.toc.tracks[cdd.index].vf.datasource)
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{
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ogg_free(cdd.index);
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}
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#endif
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#endif
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load_param(&cdd.cycles, sizeof(cdd.cycles));
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load_param(&cdd.latency, sizeof(cdd.latency));
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load_param(&cdd.index, sizeof(cdd.index));
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load_param(&cdd.lba, sizeof(cdd.lba));
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load_param(&cdd.scanOffset, sizeof(cdd.scanOffset));
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load_param(&cdd.volume, sizeof(cdd.volume));
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load_param(&cdd.status, sizeof(cdd.status));
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/* adjust current LBA within track limit */
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lba = cdd.lba;
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if (lba < cdd.toc.tracks[cdd.index].start)
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{
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lba = cdd.toc.tracks[cdd.index].start;
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}
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/* seek to current track position */
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if (!cdd.index)
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{
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/* DATA track */
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if (cdd.toc.tracks[0].fd)
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{
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pm_seek(cdd.toc.tracks[0].fd, lba * cdd.sectorSize, SEEK_SET);
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}
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}
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#ifdef USE_LIBTREMOR
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else if (cdd.toc.tracks[cdd.index].vf.seekable)
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{
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#ifdef DISABLE_MANY_OGG_OPEN_FILES
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/* VORBIS file need to be opened first */
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ov_open(cdd.toc.tracks[cdd.index].fd,&cdd.toc.tracks[cdd.index].vf,0,0);
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#endif
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/* VORBIS AUDIO track */
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ov_pcm_seek(&cdd.toc.tracks[cdd.index].vf, (lba - cdd.toc.tracks[cdd.index].start) * 588 - cdd.toc.tracks[cdd.index].offset);
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}
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#endif
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#if 0
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else if (cdd.toc.tracks[cdd.index].fd)
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{
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/* PCM AUDIO track */
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fseek(cdd.toc.tracks[cdd.index].fd, (lba * 2352) - cdd.toc.tracks[cdd.index].offset, SEEK_SET);
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}
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#else
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else
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{
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cdd_change_track(cdd.index, lba);
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}
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#endif
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return bufferptr;
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}
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int cdd_context_load_old(uint8 *state)
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{
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memcpy(&cdd.lba, state + 8, sizeof(cdd.lba));
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return 12 * 4;
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}
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int cdd_load(const char *filename, int type)
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{
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char header[0x210];
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int ret;
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/* first unmount any loaded disc */
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cdd_unload();
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/* genplus parses cue here, in PD we use our own parser */
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ret = load_cd_image(filename, &type);
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if (ret != 0)
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return ret;
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/* read first 16 bytes */
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pm_read(header, 0x10, cdd.toc.tracks[0].fd);
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/* look for valid CD image ID string */
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if (memcmp("SEGADISCSYSTEM", header, 14))
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{
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/* if not found, read next 16 bytes */
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pm_read(header, 0x10, cdd.toc.tracks[0].fd);
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/* look again for valid CD image ID string */
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if (memcmp("SEGADISCSYSTEM", header, 14))
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{
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elprintf(EL_STATUS|EL_ANOMALY, "cd: bad cd image?");
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/* assume bin without security code */
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}
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/* BIN format (2352 bytes data blocks) */
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cdd.sectorSize = 2352;
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}
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else
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{
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/* ISO format (2048 bytes data blocks) */
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cdd.sectorSize = 2048;
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}
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ret = (type == CT_BIN) ? 2352 : 2048;
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if (ret != cdd.sectorSize)
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elprintf(EL_STATUS|EL_ANOMALY, "cd: type detection mismatch");
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pm_sectorsize(cdd.sectorSize, cdd.toc.tracks[0].fd);
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/* read CD image header + security code */
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pm_read(header + 0x10, 0x200, cdd.toc.tracks[0].fd);
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|
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/* Simulate audio tracks if none found */
|
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if (cdd.toc.last == 1)
|
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{
|
||
/* Some games require exact TOC infos */
|
||
if (strstr(header + 0x180,"T-95035") != NULL)
|
||
{
|
||
/* Snatcher */
|
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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
|