274fcc35 |
1 | /*************************************************************************************** |
2 | * Genesis Plus |
3 | * CD drive processor & CD-DA fader |
4 | * |
5 | * Copyright (C) 2012-2013 Eke-Eke (Genesis Plus GX) |
6 | * |
7 | * Redistribution and use of this code or any derivative works are permitted |
8 | * provided that the following conditions are met: |
9 | * |
10 | * - Redistributions may not be sold, nor may they be used in a commercial |
11 | * product or activity. |
12 | * |
13 | * - Redistributions that are modified from the original source must include the |
14 | * complete source code, including the source code for all components used by a |
15 | * binary built from the modified sources. However, as a special exception, the |
16 | * source code distributed need not include anything that is normally distributed |
17 | * (in either source or binary form) with the major components (compiler, kernel, |
18 | * and so on) of the operating system on which the executable runs, unless that |
19 | * component itself accompanies the executable. |
20 | * |
21 | * - Redistributions must reproduce the above copyright notice, this list of |
22 | * conditions and the following disclaimer in the documentation and/or other |
23 | * materials provided with the distribution. |
24 | * |
25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
26 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
29 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
35 | * POSSIBILITY OF SUCH DAMAGE. |
36 | * |
37 | ****************************************************************************************/ |
38 | |
39 | #include "../pico_int.h" |
40 | #include "genplus_macros.h" |
41 | #include "cue.h" |
42 | #include "cdd.h" |
43 | |
44 | #ifdef USE_LIBTREMOR |
45 | #define SUPPORTED_EXT 20 |
46 | #else |
47 | #define SUPPORTED_EXT 10 |
48 | #endif |
49 | |
50 | cdd_t cdd; |
51 | |
52 | /* BCD conversion lookup tables */ |
53 | static const uint8 lut_BCD_8[100] = |
54 | { |
55 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, |
56 | 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, |
57 | 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, |
58 | 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, |
59 | 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, |
60 | 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
61 | 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
62 | 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
63 | 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
64 | 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, |
65 | }; |
66 | |
67 | static const uint16 lut_BCD_16[100] = |
68 | { |
69 | 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009, |
70 | 0x0100, 0x0101, 0x0102, 0x0103, 0x0104, 0x0105, 0x0106, 0x0107, 0x0108, 0x0109, |
71 | 0x0200, 0x0201, 0x0202, 0x0203, 0x0204, 0x0205, 0x0206, 0x0207, 0x0208, 0x0209, |
72 | 0x0300, 0x0301, 0x0302, 0x0303, 0x0304, 0x0305, 0x0306, 0x0307, 0x0308, 0x0309, |
73 | 0x0400, 0x0401, 0x0402, 0x0403, 0x0404, 0x0405, 0x0406, 0x0407, 0x0408, 0x0409, |
74 | 0x0500, 0x0501, 0x0502, 0x0503, 0x0504, 0x0505, 0x0506, 0x0507, 0x0508, 0x0509, |
75 | 0x0600, 0x0601, 0x0602, 0x0603, 0x0604, 0x0605, 0x0606, 0x0607, 0x0608, 0x0609, |
76 | 0x0700, 0x0701, 0x0702, 0x0703, 0x0704, 0x0705, 0x0706, 0x0707, 0x0708, 0x0709, |
77 | 0x0800, 0x0801, 0x0802, 0x0803, 0x0804, 0x0805, 0x0806, 0x0807, 0x0808, 0x0809, |
78 | 0x0900, 0x0901, 0x0902, 0x0903, 0x0904, 0x0905, 0x0906, 0x0907, 0x0908, 0x0909, |
79 | }; |
80 | |
81 | /* pre-build TOC */ |
82 | static const uint16 toc_snatcher[21] = |
83 | { |
84 | 56014, 495, 10120, 20555, 1580, 5417, 12502, 16090, 6553, 9681, |
85 | 8148, 20228, 8622, 6142, 5858, 1287, 7424, 3535, 31697, 2485, |
86 | 31380 |
87 | }; |
88 | |
89 | static const uint16 toc_lunar[52] = |
90 | { |
91 | 5422, 1057, 7932, 5401, 6380, 6592, 5862, 5937, 5478, 5870, |
92 | 6673, 6613, 6429, 4996, 4977, 5657, 3720, 5892, 3140, 3263, |
93 | 6351, 5187, 3249, 1464, 1596, 1750, 1751, 6599, 4578, 5205, |
94 | 1550, 1827, 2328, 1346, 1569, 1613, 7199, 4928, 1656, 2549, |
95 | 1875, 3901, 1850, 2399, 2028, 1724, 4889, 14551, 1184, 2132, |
96 | 685, 3167 |
97 | }; |
98 | |
99 | static const uint32 toc_shadow[15] = |
100 | { |
101 | 10226, 70054, 11100, 12532, 12444, 11923, 10059, 10167, 10138, 13792, |
102 | 11637, 2547, 2521, 3856, 900 |
103 | }; |
104 | |
105 | static const uint32 toc_dungeon[13] = |
106 | { |
107 | 2250, 22950, 16350, 24900, 13875, 19950, 13800, 15375, 17400, 17100, |
108 | 3325, 6825, 25275 |
109 | }; |
110 | |
111 | static const uint32 toc_ffight[26] = |
112 | { |
113 | 11994, 9742, 10136, 9685, 9553, 14588, 9430, 8721, 9975, 9764, |
114 | 9704, 12796, 585, 754, 951, 624, 9047, 1068, 817, 9191, 1024, |
115 | 14562, 10320, 8627, 3795, 3047 |
116 | }; |
117 | |
118 | static const uint32 toc_ffightj[29] = |
119 | { |
120 | 11994, 9752, 10119, 9690, 9567, 14575, 9431, 8731, 9965, 9763, |
121 | 9716, 12791, 579, 751, 958, 630, 9050, 1052, 825, 9193, 1026, |
122 | 14553, 9834, 10542, 1699, 1792, 1781, 3783, 3052 |
123 | }; |
124 | |
125 | /* supported WAVE file header (16-bit stereo samples @44.1kHz) */ |
126 | static const unsigned char waveHeader[32] = |
127 | { |
128 | 0x57,0x41,0x56,0x45,0x66,0x6d,0x74,0x20,0x10,0x00,0x00,0x00,0x01,0x00,0x02,0x00, |
129 | 0x44,0xac,0x00,0x00,0x10,0xb1,0x02,0x00,0x04,0x00,0x10,0x00,0x64,0x61,0x74,0x61 |
130 | }; |
131 | |
132 | #ifdef USE_LIBTREMOR |
133 | #ifdef DISABLE_MANY_OGG_OPEN_FILES |
134 | static void ogg_free(int i) |
135 | { |
136 | /* clear OGG file descriptor to prevent file from being closed */ |
137 | cdd.toc.tracks[i].vf.datasource = NULL; |
138 | |
139 | /* close VORBIS file structure */ |
140 | ov_clear(&cdd.toc.tracks[i].vf); |
141 | |
142 | /* indicates that the track is a seekable VORBIS file */ |
143 | cdd.toc.tracks[i].vf.seekable = 1; |
144 | |
145 | /* reset file reading position */ |
146 | fseek(cdd.toc.tracks[i].fd, 0, SEEK_SET); |
147 | } |
148 | #endif |
149 | #endif |
150 | |
151 | void cdd_reset(void) |
152 | { |
153 | /* reset cycle counter */ |
154 | cdd.cycles = 0; |
155 | |
156 | /* reset drive access latency */ |
157 | cdd.latency = 0; |
158 | |
159 | /* reset track index */ |
160 | cdd.index = 0; |
161 | |
162 | /* reset logical block address */ |
163 | cdd.lba = 0; |
164 | |
165 | /* reset status */ |
166 | cdd.status = cdd.loaded ? CD_STOP : NO_DISC; |
167 | |
168 | /* reset CD-DA fader (full volume) */ |
169 | cdd.volume = 0x400; |
170 | |
171 | /* clear CD-DA output */ |
172 | cdd.audio[0] = cdd.audio[1] = 0; |
173 | } |
174 | |
175 | /* FIXME: use cdd_read_audio() instead */ |
176 | static void cdd_change_track(int index, int lba) |
177 | { |
178 | int i, base, lba_offset, lb_len; |
179 | |
180 | for (i = index; i > 0; i--) |
181 | if (cdd.toc.tracks[i].fd != NULL) |
182 | break; |
183 | |
184 | Pico_mcd->cdda_stream = cdd.toc.tracks[i].fd; |
185 | base = cdd.toc.tracks[index].offset; |
186 | lba_offset = lba - cdd.toc.tracks[index].start; |
187 | lb_len = cdd.toc.tracks[index].end - cdd.toc.tracks[index].start; |
188 | |
189 | elprintf(EL_CD, "play #%d lba %d base %d", index, lba, base); |
190 | |
191 | cdda_start_play(base, lba_offset, lb_len); |
192 | } |
193 | |
194 | int cdd_context_save(uint8 *state) |
195 | { |
196 | int bufferptr = 0; |
197 | |
198 | save_param(&cdd.cycles, sizeof(cdd.cycles)); |
199 | save_param(&cdd.latency, sizeof(cdd.latency)); |
200 | save_param(&cdd.index, sizeof(cdd.index)); |
201 | save_param(&cdd.lba, sizeof(cdd.lba)); |
202 | save_param(&cdd.scanOffset, sizeof(cdd.scanOffset)); |
203 | save_param(&cdd.volume, sizeof(cdd.volume)); |
204 | save_param(&cdd.status, sizeof(cdd.status)); |
205 | |
206 | return bufferptr; |
207 | } |
208 | |
209 | int cdd_context_load(uint8 *state) |
210 | { |
211 | int lba; |
212 | int bufferptr = 0; |
213 | |
214 | #ifdef USE_LIBTREMOR |
215 | #ifdef DISABLE_MANY_OGG_OPEN_FILES |
216 | /* close previous track VORBIS file structure to save memory */ |
217 | if (cdd.toc.tracks[cdd.index].vf.datasource) |
218 | { |
219 | ogg_free(cdd.index); |
220 | } |
221 | #endif |
222 | #endif |
223 | |
224 | load_param(&cdd.cycles, sizeof(cdd.cycles)); |
225 | load_param(&cdd.latency, sizeof(cdd.latency)); |
226 | load_param(&cdd.index, sizeof(cdd.index)); |
227 | load_param(&cdd.lba, sizeof(cdd.lba)); |
228 | load_param(&cdd.scanOffset, sizeof(cdd.scanOffset)); |
229 | load_param(&cdd.volume, sizeof(cdd.volume)); |
230 | load_param(&cdd.status, sizeof(cdd.status)); |
231 | |
232 | /* adjust current LBA within track limit */ |
233 | lba = cdd.lba; |
234 | if (lba < cdd.toc.tracks[cdd.index].start) |
235 | { |
236 | lba = cdd.toc.tracks[cdd.index].start; |
237 | } |
238 | |
239 | /* seek to current track position */ |
240 | if (!cdd.index) |
241 | { |
242 | /* DATA track */ |
243 | if (cdd.toc.tracks[0].fd) |
244 | { |
245 | pm_seek(cdd.toc.tracks[0].fd, lba * cdd.sectorSize, SEEK_SET); |
246 | } |
247 | } |
248 | #ifdef USE_LIBTREMOR |
249 | else if (cdd.toc.tracks[cdd.index].vf.seekable) |
250 | { |
251 | #ifdef DISABLE_MANY_OGG_OPEN_FILES |
252 | /* VORBIS file need to be opened first */ |
253 | ov_open(cdd.toc.tracks[cdd.index].fd,&cdd.toc.tracks[cdd.index].vf,0,0); |
254 | #endif |
255 | /* VORBIS AUDIO track */ |
256 | ov_pcm_seek(&cdd.toc.tracks[cdd.index].vf, (lba - cdd.toc.tracks[cdd.index].start) * 588 - cdd.toc.tracks[cdd.index].offset); |
257 | } |
258 | #endif |
259 | #if 0 |
260 | else if (cdd.toc.tracks[cdd.index].fd) |
261 | { |
262 | /* PCM AUDIO track */ |
263 | fseek(cdd.toc.tracks[cdd.index].fd, (lba * 2352) - cdd.toc.tracks[cdd.index].offset, SEEK_SET); |
264 | } |
265 | #else |
266 | else |
267 | { |
268 | cdd_change_track(cdd.index, lba); |
269 | } |
270 | #endif |
271 | |
272 | return bufferptr; |
273 | } |
274 | |
275 | int cdd_context_load_old(uint8 *state) |
276 | { |
277 | memcpy(&cdd.lba, state + 8, sizeof(cdd.lba)); |
278 | return 12 * 4; |
279 | } |
280 | |
281 | int cdd_load(const char *filename, int type) |
282 | { |
283 | char header[0x210]; |
284 | int ret; |
285 | |
286 | /* first unmount any loaded disc */ |
287 | cdd_unload(); |
288 | |
289 | /* genplus parses cue here, in PD we use our own parser */ |
290 | ret = load_cd_image(filename, &type); |
291 | if (ret != 0) |
292 | return ret; |
293 | |
294 | /* read first 16 bytes */ |
295 | pm_read(header, 0x10, cdd.toc.tracks[0].fd); |
296 | |
297 | /* look for valid CD image ID string */ |
298 | if (memcmp("SEGADISCSYSTEM", header, 14)) |
299 | { |
300 | /* if not found, read next 16 bytes */ |
301 | pm_read(header, 0x10, cdd.toc.tracks[0].fd); |
302 | |
303 | /* look again for valid CD image ID string */ |
304 | if (memcmp("SEGADISCSYSTEM", header, 14)) |
305 | { |
306 | elprintf(EL_STATUS|EL_ANOMALY, "cd: bad cd image?"); |
307 | /* assume bin without security code */ |
308 | } |
309 | |
310 | /* BIN format (2352 bytes data blocks) */ |
311 | cdd.sectorSize = 2352; |
312 | } |
313 | else |
314 | { |
315 | /* ISO format (2048 bytes data blocks) */ |
316 | cdd.sectorSize = 2048; |
317 | } |
318 | |
319 | ret = (type == CT_BIN) ? 2352 : 2048; |
320 | if (ret != cdd.sectorSize) |
321 | elprintf(EL_STATUS|EL_ANOMALY, "cd: type detection mismatch"); |
322 | |
323 | /* read CD image header + security code */ |
324 | pm_read(header + 0x10, 0x200, cdd.toc.tracks[0].fd); |
325 | |
326 | /* Simulate audio tracks if none found */ |
327 | if (cdd.toc.last == 1) |
328 | { |
329 | /* Some games require exact TOC infos */ |
330 | if (strstr(header + 0x180,"T-95035") != NULL) |
331 | { |
332 | /* Snatcher */ |
333 | cdd.toc.last = cdd.toc.end = 0; |
334 | do |
335 | { |
336 | cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end; |
337 | cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_snatcher[cdd.toc.last]; |
338 | cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end; |
339 | cdd.toc.last++; |
340 | } |
341 | while (cdd.toc.last < 21); |
342 | } |
343 | else if (strstr(header + 0x180,"T-127015") != NULL) |
344 | { |
345 | /* Lunar - The Silver Star */ |
346 | cdd.toc.last = cdd.toc.end = 0; |
347 | do |
348 | { |
349 | cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end; |
350 | cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_lunar[cdd.toc.last]; |
351 | cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end; |
352 | cdd.toc.last++; |
353 | } |
354 | while (cdd.toc.last < 52); |
355 | } |
356 | else if (strstr(header + 0x180,"T-113045") != NULL) |
357 | { |
358 | /* Shadow of the Beast II */ |
359 | cdd.toc.last = cdd.toc.end = 0; |
360 | do |
361 | { |
362 | cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end; |
363 | cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_shadow[cdd.toc.last]; |
364 | cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end; |
365 | cdd.toc.last++; |
366 | } |
367 | while (cdd.toc.last < 15); |
368 | } |
369 | else if (strstr(header + 0x180,"T-143025") != NULL) |
370 | { |
371 | /* Dungeon Explorer */ |
372 | cdd.toc.last = cdd.toc.end = 0; |
373 | do |
374 | { |
375 | cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end; |
376 | cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_dungeon[cdd.toc.last]; |
377 | cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end; |
378 | cdd.toc.last++; |
379 | } |
380 | while (cdd.toc.last < 13); |
381 | } |
382 | else if (strstr(header + 0x180,"MK-4410") != NULL) |
383 | { |
384 | /* Final Fight CD (USA, Europe) */ |
385 | cdd.toc.last = cdd.toc.end = 0; |
386 | do |
387 | { |
388 | cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end; |
389 | cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_ffight[cdd.toc.last]; |
390 | cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end; |
391 | cdd.toc.last++; |
392 | } |
393 | while (cdd.toc.last < 26); |
394 | } |
395 | else if (strstr(header + 0x180,"G-6013") != NULL) |
396 | { |
397 | /* Final Fight CD (Japan) */ |
398 | cdd.toc.last = cdd.toc.end = 0; |
399 | do |
400 | { |
401 | cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end; |
402 | cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + toc_ffightj[cdd.toc.last]; |
403 | cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end; |
404 | cdd.toc.last++; |
405 | } |
406 | while (cdd.toc.last < 29); |
407 | } |
408 | #if 0 |
409 | else |
410 | { |
411 | /* default TOC (99 tracks & 2s per audio tracks) */ |
412 | do |
413 | { |
414 | cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end + 2*75; |
415 | cdd.toc.tracks[cdd.toc.last].end = cdd.toc.tracks[cdd.toc.last].start + 2*75; |
416 | cdd.toc.end = cdd.toc.tracks[cdd.toc.last].end; |
417 | cdd.toc.last++; |
418 | } |
419 | while ((cdd.toc.last < 99) && (cdd.toc.end < 56*60*75)); |
420 | } |
421 | #endif |
422 | } |
423 | |
424 | /* Lead-out */ |
425 | cdd.toc.tracks[cdd.toc.last].start = cdd.toc.end; |
426 | |
427 | /* CD loaded */ |
428 | cdd.loaded = 1; |
429 | return 0; |
430 | } |
431 | |
432 | int cdd_unload(void) |
433 | { |
434 | int was_loaded = cdd.loaded; |
435 | |
436 | if (cdd.loaded) |
437 | { |
438 | int i; |
439 | |
440 | /* close CD tracks */ |
441 | if (cdd.toc.tracks[0].fd) |
442 | { |
443 | pm_close(cdd.toc.tracks[0].fd); |
444 | cdd.toc.tracks[0].fd = NULL; |
445 | } |
446 | |
447 | for (i = 1; i < cdd.toc.last; i++) |
448 | { |
449 | #ifdef USE_LIBTREMOR |
450 | if (cdd.toc.tracks[i].vf.datasource) |
451 | { |
452 | /* close VORBIS file (if still opened) */ |
453 | ov_clear(&cdd.toc.tracks[i].vf); |
454 | } |
455 | else |
456 | #endif |
457 | if (cdd.toc.tracks[i].fd) |
458 | { |
459 | /* close file */ |
460 | if (Pico_mcd->cdda_type == CT_MP3) |
461 | fclose(cdd.toc.tracks[i].fd); |
462 | else |
463 | pm_close(cdd.toc.tracks[0].fd); |
464 | |
465 | /* detect single file images */ |
466 | if (cdd.toc.tracks[i+1].fd == cdd.toc.tracks[i].fd) |
467 | { |
468 | /* exit loop */ |
469 | i = cdd.toc.last; |
470 | } |
471 | } |
472 | } |
473 | |
474 | /* CD unloaded */ |
475 | cdd.loaded = 0; |
476 | } |
477 | |
478 | /* reset TOC */ |
479 | memset(&cdd.toc, 0x00, sizeof(cdd.toc)); |
480 | |
481 | /* unknown CD image file format */ |
482 | cdd.sectorSize = 0; |
483 | |
484 | return was_loaded; |
485 | } |
486 | |
487 | void cdd_read_data(uint8 *dst) |
488 | { |
489 | /* only read DATA track sectors */ |
490 | if ((cdd.lba >= 0) && (cdd.lba < cdd.toc.tracks[0].end)) |
491 | { |
492 | /* BIN format ? */ |
493 | if (cdd.sectorSize == 2352) |
494 | { |
495 | /* skip 16-byte header */ |
496 | pm_seek(cdd.toc.tracks[0].fd, cdd.lba * 2352 + 16, SEEK_SET); |
497 | } |
498 | |
499 | /* read sector data (Mode 1 = 2048 bytes) */ |
500 | pm_read(dst, 2048, cdd.toc.tracks[0].fd); |
501 | } |
502 | } |
503 | |
504 | #if 0 |
505 | void cdd_read_audio(unsigned int samples) |
506 | { |
507 | /* previous audio outputs */ |
508 | int16 l = cdd.audio[0]; |
509 | int16 r = cdd.audio[1]; |
510 | |
511 | /* get number of internal clocks (samples) needed */ |
512 | samples = blip_clocks_needed(blip[0], samples); |
513 | |
514 | /* audio track playing ? */ |
515 | if (!Pico_mcd->regs[0x36>>1].byte.h && cdd.toc.tracks[cdd.index].fd) |
516 | { |
517 | int i, mul, delta; |
518 | |
519 | /* current CD-DA fader volume */ |
520 | int curVol = cdd.volume; |
521 | |
522 | /* CD-DA fader volume setup (0-1024) */ |
523 | int endVol = Pico_mcd->regs[0x34>>1].w >> 4; |
524 | |
525 | /* read samples from current block */ |
526 | #ifdef USE_LIBTREMOR |
527 | if (cdd.toc.tracks[cdd.index].vf.datasource) |
528 | { |
529 | int len, done = 0; |
530 | int16 *ptr = (int16 *) (cdc.ram); |
531 | samples = samples * 4; |
532 | while (done < samples) |
533 | { |
534 | len = ov_read(&cdd.toc.tracks[cdd.index].vf, (char *)(cdc.ram + done), samples - done, 0); |
535 | if (len <= 0) |
536 | { |
537 | done = samples; |
538 | break; |
539 | } |
540 | done += len; |
541 | } |
542 | samples = done / 4; |
543 | |
544 | /* process 16-bit (host-endian) stereo samples */ |
545 | for (i=0; i<samples; i++) |
546 | { |
547 | /* CD-DA fader multiplier (cf. LC7883 datasheet) */ |
548 | /* (MIN) 0,1,2,3,4,8,12,16,20...,1020,1024 (MAX) */ |
549 | mul = (curVol & 0x7fc) ? (curVol & 0x7fc) : (curVol & 0x03); |
550 | |
551 | /* left channel */ |
552 | delta = ((ptr[0] * mul) / 1024) - l; |
553 | ptr++; |
554 | l += delta; |
555 | blip_add_delta_fast(blip[0], i, delta); |
556 | |
557 | /* right channel */ |
558 | delta = ((ptr[0] * mul) / 1024) - r; |
559 | ptr++; |
560 | r += delta; |
561 | blip_add_delta_fast(blip[1], i, delta); |
562 | |
563 | /* update CD-DA fader volume (one step/sample) */ |
564 | if (curVol < endVol) |
565 | { |
566 | /* fade-in */ |
567 | curVol++; |
568 | } |
569 | else if (curVol > endVol) |
570 | { |
571 | /* fade-out */ |
572 | curVol--; |
573 | } |
574 | else if (!curVol) |
575 | { |
576 | /* audio will remain muted until next setup */ |
577 | break; |
578 | } |
579 | } |
580 | } |
581 | else |
582 | #endif |
583 | { |
584 | #ifdef LSB_FIRST |
585 | int16 *ptr = (int16 *) (cdc.ram); |
586 | #else |
587 | uint8 *ptr = cdc.ram; |
588 | #endif |
589 | fread(cdc.ram, 1, samples * 4, cdd.toc.tracks[cdd.index].fd); |
590 | |
591 | /* process 16-bit (little-endian) stereo samples */ |
592 | for (i=0; i<samples; i++) |
593 | { |
594 | /* CD-DA fader multiplier (cf. LC7883 datasheet) */ |
595 | /* (MIN) 0,1,2,3,4,8,12,16,20...,1020,1024 (MAX) */ |
596 | mul = (curVol & 0x7fc) ? (curVol & 0x7fc) : (curVol & 0x03); |
597 | |
598 | /* left channel */ |
599 | #ifdef LSB_FIRST |
600 | delta = ((ptr[0] * mul) / 1024) - l; |
601 | ptr++; |
602 | #else |
603 | delta = (((int16)((ptr[0] + ptr[1]*256)) * mul) / 1024) - l; |
604 | ptr += 2; |
605 | #endif |
606 | l += delta; |
607 | blip_add_delta_fast(blip[0], i, delta); |
608 | |
609 | /* right channel */ |
610 | #ifdef LSB_FIRST |
611 | delta = ((ptr[0] * mul) / 1024) - r; |
612 | ptr++; |
613 | #else |
614 | delta = (((int16)((ptr[0] + ptr[1]*256)) * mul) / 1024) - r; |
615 | ptr += 2; |
616 | #endif |
617 | r += delta; |
618 | blip_add_delta_fast(blip[1], i, delta); |
619 | |
620 | /* update CD-DA fader volume (one step/sample) */ |
621 | if (curVol < endVol) |
622 | { |
623 | /* fade-in */ |
624 | curVol++; |
625 | } |
626 | else if (curVol > endVol) |
627 | { |
628 | /* fade-out */ |
629 | curVol--; |
630 | } |
631 | else if (!curVol) |
632 | { |
633 | /* audio will remain muted until next setup */ |
634 | break; |
635 | } |
636 | } |
637 | } |
638 | |
639 | /* save current CD-DA fader volume */ |
640 | cdd.volume = curVol; |
641 | |
642 | /* save last audio output for next frame */ |
643 | cdd.audio[0] = l; |
644 | cdd.audio[1] = r; |
645 | } |
646 | else |
647 | { |
648 | /* no audio output */ |
649 | if (l) blip_add_delta_fast(blip[0], 0, -l); |
650 | if (r) blip_add_delta_fast(blip[1], 0, -r); |
651 | |
652 | /* save audio output for next frame */ |
653 | cdd.audio[0] = 0; |
654 | cdd.audio[1] = 0; |
655 | } |
656 | |
657 | /* end of Blip Buffer timeframe */ |
658 | blip_end_frame(blip[0], samples); |
659 | blip_end_frame(blip[1], samples); |
660 | } |
661 | #endif |
662 | |
663 | |
664 | void cdd_update(void) |
665 | { |
666 | #ifdef LOG_CDD |
667 |