notaz.gp2x.de / picodrive.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
1.40c psp release
[picodrive.git] / platform / gp2x / 940ctl.c
... / ...
CommitLineData
1// Code for communication with ARM940 and control of it.\r
2// (c) Copyright 2007, Grazvydas "notaz" Ignotas\r
3\r
4#include <stdio.h>\r
5#include <stdlib.h>\r
6#include <string.h>\r
7#include <unistd.h>\r
8#include <sys/mman.h>\r
9#include <sys/ioctl.h>\r
10#include <fcntl.h>\r
11#include <errno.h>\r
12\r
13#include "code940/940shared.h"\r
14#include "gp2x.h"\r
15#include "emu.h"\r
16#include "menu.h"\r
17#include "../common/mp3.h"\r
18#include "../common/arm_utils.h"\r
19#include "../common/menu.h"\r
20#include "../common/emu.h"\r
21#include "../../Pico/PicoInt.h"\r
22#include "../../Pico/sound/ym2612.h"\r
23#include "../../Pico/sound/mix.h"\r
24\r
25/* we will need some gp2x internals here */\r
26extern volatile unsigned short *gp2x_memregs; /* from minimal library rlyeh */\r
27extern volatile unsigned long *gp2x_memregl;\r
28\r
29extern int reset_timing;\r
30static unsigned char *shared_mem = 0;\r
31static _940_data_t *shared_data = 0;\r
32_940_ctl_t *shared_ctl = 0;\r
33unsigned char *mp3_mem = 0;\r
34\r
35#define MP3_SIZE_MAX (0x400000 + 0x800000) // 12M\r
36#define CODE940_FILE "pico940_v2.bin"\r
37\r
38int crashed_940 = 0;\r
39\r
40static FILE *loaded_mp3 = 0;\r
41\r
42/***********************************************************/\r
43\r
44#define MAXOUT (+32767)\r
45#define MINOUT (-32768)\r
46\r
47/* limitter */\r
48#define Limit(val, max,min) { \\r
49 if ( val > max ) val = max; \\r
50 else if ( val < min ) val = min; \\r
51}\r
52\r
53/* these will be managed locally on our side */\r
54static UINT8 *REGS = 0; /* we will also keep local copy of regs for savestates and such */\r
55static INT32 *addr_A1; /* address line A1 */\r
56\r
57static int dacen;\r
58static INT32 dacout;\r
59static UINT8 ST_address; /* address register */\r
60\r
61static int writebuff_ptr = 0;\r
62\r
63\r
64/* OPN Mode Register Write */\r
65static int set_timers( int v )\r
66{\r
67 int change;\r
68\r
69 /* b7 = CSM MODE */\r
70 /* b6 = 3 slot mode */\r
71 /* b5 = reset b */\r
72 /* b4 = reset a */\r
73 /* b3 = timer enable b */\r
74 /* b2 = timer enable a */\r
75 /* b1 = load b */\r
76 /* b0 = load a */\r
77 change = (ym2612_st->mode ^ v) & 0xc0;\r
78 ym2612_st->mode = v;\r
79\r
80 /* reset Timer b flag */\r
81 if( v & 0x20 )\r
82 ym2612_st->status &= ~2;\r
83\r
84 /* reset Timer a flag */\r
85 if( v & 0x10 )\r
86 ym2612_st->status &= ~1;\r
87\r
88 return change;\r
89}\r
90\r
91/* YM2612 write */\r
92/* a = address */\r
93/* v = value */\r
94/* returns 1 if sample affecting state changed */\r
95int YM2612Write_940(unsigned int a, unsigned int v)\r
96{\r
97 int addr;\r
98 int upd = 1; /* the write affects sample generation */\r
99\r
100 v &= 0xff; /* adjust to 8 bit bus */\r
101 a &= 3;\r
102\r
103 //printf("%05i:%03i: ym w ([%i] %02x)\n", Pico.m.frame_count, Pico.m.scanline, a, v);\r
104\r
105 switch( a ) {\r
106 case 0: /* address port 0 */\r
107 if (!*addr_A1 && ST_address == v)\r
108 return 0; /* address already selected, don't send this command to 940 */\r
109 ST_address = v;\r
110 /* don't send DAC or timer related address changes to 940 */\r
111 if (!*addr_A1 && (v & 0xf0) == 0x20 &&\r
112 (v == 0x24 || v == 0x25 || v == 0x26 || v == 0x2a))\r
113 return 0;\r
114 *addr_A1 = 0;\r
115 upd = 0;\r
116 break;\r
117\r
118 case 1: /* data port 0 */\r
119 if (*addr_A1 != 0) {\r
120 return 0; /* verified on real YM2608 */\r
121 }\r
122\r
123 addr = ST_address;\r
124 REGS[addr] = v;\r
125\r
126 switch( addr & 0xf0 )\r
127 {\r
128 case 0x20: /* 0x20-0x2f Mode */\r
129 switch( addr )\r
130 {\r
131 case 0x24: { // timer A High 8\r
132 int TAnew = (ym2612_st->TA & 0x03)|(((int)v)<<2);\r
133 if (ym2612_st->TA != TAnew) {\r
134 // we should reset ticker only if new value is written. Outrun requires this.\r
135 ym2612_st->TA = TAnew;\r
136 ym2612_st->TAC = (1024-TAnew)*18;\r
137 ym2612_st->TAT = 0;\r
138 }\r
139 return 0;\r
140 }\r
141 case 0x25: { // timer A Low 2\r
142 int TAnew = (ym2612_st->TA & 0x3fc)|(v&3);\r
143 if (ym2612_st->TA != TAnew) {\r
144 ym2612_st->TA = TAnew;\r
145 ym2612_st->TAC = (1024-TAnew)*18;\r
146 ym2612_st->TAT = 0;\r
147 }\r
148 return 0;\r
149 }\r
150 case 0x26: // timer B\r
151 if (ym2612_st->TB != v) {\r
152 ym2612_st->TB = v;\r
153 ym2612_st->TBC = (256-v)<<4;\r
154 ym2612_st->TBC *= 18;\r
155 ym2612_st->TBT = 0;\r
156 }\r
157 return 0;\r
158 case 0x27: /* mode, timer control */\r
159 if (set_timers( v ))\r
160 break; // other side needs ST.mode for 3slot mode\r
161 return 0;\r
162 case 0x2a: /* DAC data (YM2612) */\r
163 dacout = ((int)v - 0x80) << 6; /* level unknown (notaz: 8 seems to be too much) */\r
164 return 0;\r
165 case 0x2b: /* DAC Sel (YM2612) */\r
166 /* b7 = dac enable */\r
167 dacen = v & 0x80;\r
168 upd = 0;\r
169 break; // other side has to know this\r
170 default:\r
171 break;\r
172 }\r
173 break;\r
174 }\r
175 break;\r
176\r
177 case 2: /* address port 1 */\r
178 if (*addr_A1 && ST_address == v)\r
179 return 0;\r
180 ST_address = v;\r
181 *addr_A1 = 1;\r
182 upd = 0;\r
183 break;\r
184\r
185 case 3: /* data port 1 */\r
186 if (*addr_A1 != 1) {\r
187 return 0; /* verified on real YM2608 */\r
188 }\r
189\r
190 addr = ST_address | 0x100;\r
191 REGS[addr] = v;\r
192 break;\r
193 }\r
194\r
195 //printf("ym pass\n");\r
196\r
197 if(currentConfig.EmuOpt & 4) {\r
198 UINT16 *writebuff = shared_ctl->writebuffsel ? shared_ctl->writebuff0 : shared_ctl->writebuff1;\r
199\r
200 /* detect rapid ym updates */\r
201 if (upd && !(writebuff_ptr & 0x80000000) && Pico.m.scanline < 224) {\r
202 int mid = Pico.m.pal ? 68 : 93;\r
203 if (Pico.m.scanline > mid) {\r
204 //printf("%05i:%03i: rapid ym\n", Pico.m.frame_count, Pico.m.scanline);\r
205 writebuff[writebuff_ptr++ & 0xffff] = 0xfffe;\r
206 writebuff_ptr |= 0x80000000;\r
207 //printf("%05i:%03i: ym w ([%02x] %02x, upd=%i)\n", Pico.m.frame_count, Pico.m.scanline, addr, v, upd);\r
208 }\r
209 }\r
210\r
211 /* queue this write for 940 */\r
212 if ((writebuff_ptr&0xffff) < 2047) {\r
213 writebuff[writebuff_ptr++ & 0xffff] = (a<<8)|v;\r
214 } else {\r
215 printf("warning: writebuff_ptr > 2047 ([%i] %02x)\n", a, v);\r
216 }\r
217 }\r
218\r
219 return 0; // cause the engine to do updates once per frame only\r
220}\r
221\r
222\r
223#define CHECK_BUSY(job) \\r
224 (gp2x_memregs[0x3b46>>1] & (1<<(job-1)))\r
225\r
226static void wait_busy_940(int job)\r
227{\r
228 int i;\r
229\r
230 job--;\r
231 for (i = 0; (gp2x_memregs[0x3b46>>1] & (1<<job)) && i < 0x10000; i++)\r
232 spend_cycles(8*1024); // tested to be best for mp3 dec\r
233 if (i < 0x10000) return;\r
234\r
235 /* 940 crashed */\r
236 printf("940 crashed (cnt: %i, ve: ", shared_ctl->loopc);\r
237 for (i = 0; i < 8; i++)\r
238 printf("%i ", shared_ctl->vstarts[i]);\r
239 printf(")\n");\r
240 printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
241 gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
242 printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
243 printf("trying to interrupt..\n");\r
244 gp2x_memregs[0x3B3E>>1] = 0xffff;\r
245 for (i = 0; gp2x_memregs[0x3b46>>1] && i < 0x10000; i++)\r
246 spend_cycles(8*1024);\r
247 printf("i = 0x%x\n", i);\r
248 printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
249 gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
250 printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
251\r
252 strcpy(menuErrorMsg, "940 crashed, too much overclock?");\r
253 engineState = PGS_Menu;\r
254 crashed_940 = 1;\r
255}\r
256\r
257\r
258static void add_job_940(int job)\r
259{\r
260 if (job <= 0 || job > 16) {\r
261 printf("add_job_940: bad job: %i\n", job);\r
262 return;\r
263 }\r
264\r
265 // generate interrupt for this job\r
266 job--;\r
267 gp2x_memregs[(0x3B20+job*2)>>1] = 1;\r
268\r
269// printf("added %i, pending %04x\n", job+1, gp2x_memregs[0x3b46>>1]);\r
270}\r
271\r
272\r
273void YM2612PicoStateLoad_940(void)\r
274{\r
275 int i, old_A1 = *addr_A1;\r
276\r
277 /* make sure JOB940_PICOSTATELOAD gets done before next JOB940_YM2612UPDATEONE */\r
278 add_job_940(JOB940_PICOSTATELOAD);\r
279 if (CHECK_BUSY(JOB940_PICOSTATELOAD)) wait_busy_940(JOB940_PICOSTATELOAD);\r
280\r
281 writebuff_ptr = 0;\r
282\r
283 // feed all the registers and update internal state\r
284 for(i = 0; i < 0x100; i++) {\r
285 YM2612Write_940(0, i);\r
286 YM2612Write_940(1, REGS[i]);\r
287 }\r
288 for(i = 0; i < 0x100; i++) {\r
289 YM2612Write_940(2, i);\r
290 YM2612Write_940(3, REGS[i|0x100]);\r
291 }\r
292\r
293 *addr_A1 = old_A1;\r
294}\r
295\r
296\r
297static void internal_reset(void)\r
298{\r
299 writebuff_ptr = 0;\r
300 ym2612_st->mode = 0;\r
301 ym2612_st->status = 0; /* normal mode */\r
302 ym2612_st->TA = 0;\r
303 ym2612_st->TAC = 0;\r
304 ym2612_st->TAT = 0;\r
305 ym2612_st->TB = 0;\r
306 ym2612_st->TBC = 0;\r
307 ym2612_st->TBT = 0;\r
308 dacen = 0;\r
309 dacout = 0;\r
310 ST_address= 0;\r
311}\r
312\r
313\r
314/* this must be called after mmu hack, the allocated regions must not get cached */\r
315void sharedmem_init(void)\r
316{\r
317 if (shared_mem != NULL) return;\r
318\r
319 shared_mem = (unsigned char *) mmap(0, 0x210000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2000000);\r
320 if(shared_mem == MAP_FAILED)\r
321 {\r
322 printf("mmap(shared_data) failed with %i\n", errno);\r
323 exit(1);\r
324 }\r
325 shared_data = (_940_data_t *) (shared_mem+0x100000);\r
326 /* this area must not get buffered on either side */\r
327 shared_ctl = (_940_ctl_t *) (shared_mem+0x200000);\r
328 mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2400000);\r
329 if (mp3_mem == MAP_FAILED)\r
330 {\r
331 printf("mmap(mp3_mem) failed with %i\n", errno);\r
332 exit(1);\r
333 }\r
334 crashed_940 = 1;\r
335}\r
336\r
337\r
338void sharedmem_deinit(void)\r
339{\r
340 munmap(shared_mem, 0x210000);\r
341 munmap(mp3_mem, MP3_SIZE_MAX);\r
342 shared_mem = mp3_mem = NULL;\r
343 shared_data = NULL;\r
344 shared_ctl = NULL;\r
345}\r
346\r
347\r
348extern char **g_argv;\r
349\r
350/* none of the functions in this file should be called before this one */\r
351void YM2612Init_940(int baseclock, int rate)\r
352{\r
353 printf("YM2612Init_940()\n");\r
354 printf("Mem usage: shared_data: %i, shared_ctl: %i\n", sizeof(*shared_data), sizeof(*shared_ctl));\r
355\r
356 Reset940(1, 2);\r
357 Pause940(1);\r
358\r
359 gp2x_memregs[0x3B40>>1] = 0; // disable DUALCPU interrupts for 920\r
360 gp2x_memregs[0x3B42>>1] = 1; // enable DUALCPU interrupts for 940\r
361\r
362 gp2x_memregl[0x4504>>2] = 0; // make sure no FIQs will be generated\r
363 gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r
364\r
365\r
366 if (crashed_940)\r
367 {\r
368 unsigned char ucData[1024];\r
369 int nRead, i, nLen = 0;\r
370 char binpath[1024];\r
371 FILE *fp;\r
372\r
373 strncpy(binpath, g_argv[0], 1023);\r
374 binpath[1023] = 0;\r
375 for (i = strlen(binpath); i > 0; i--)\r
376 if (binpath[i] == '/') { binpath[i] = 0; break; }\r
377 strcat(binpath, "/" CODE940_FILE);\r
378\r
379 fp = fopen(binpath, "rb");\r
380 if(!fp)\r
381 {\r
382 memset(gp2x_screen, 0, 320*240*2);\r
383 text_out16(10, 100, "failed to open required file:");\r
384 text_out16(10, 110, CODE940_FILE);\r
385 gp2x_video_flip2();\r
386 printf("failed to open %s\n", binpath);\r
387 exit(1);\r
388 }\r
389\r
390 while(1)\r
391 {\r
392 nRead = fread(ucData, 1, 1024, fp);\r
393 if(nRead <= 0)\r
394 break;\r
395 memcpy(shared_mem + nLen, ucData, nRead);\r
396 nLen += nRead;\r
397 }\r
398 fclose(fp);\r
399 crashed_940 = 0;\r
400 }\r
401\r
402 memset(shared_data, 0, sizeof(*shared_data));\r
403 memset(shared_ctl, 0, sizeof(*shared_ctl));\r
404\r
405 /* cause local ym2612 to init REGS */\r
406 YM2612Init_(baseclock, rate);\r
407\r
408 REGS = YM2612GetRegs();\r
409 addr_A1 = (INT32 *) (REGS + 0x200);\r
410\r
411 ym2612_dacen = &dacen;\r
412 ym2612_dacout = &dacout;\r
413\r
414 internal_reset();\r
415\r
416 loaded_mp3 = 0;\r
417\r
418 gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r
419 gp2x_memregl[0x4500>>2] = 0xffffffff; // clear pending IRQs in SRCPND\r
420 gp2x_memregl[0x4510>>2] = 0xffffffff; // clear pending IRQs in INTPND\r
421\r
422 /* start the 940 */\r
423 Reset940(0, 2);\r
424 Pause940(0);\r
425\r
426 // YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\r
427\r
428 /* now cause 940 to init it's ym2612 stuff */\r
429 shared_ctl->baseclock = baseclock;\r
430 shared_ctl->rate = rate;\r
431 add_job_940(JOB940_INITALL);\r
432}\r
433\r
434\r
435void YM2612ResetChip_940(void)\r
436{\r
437 printf("YM2612ResetChip_940()\n");\r
438 if (shared_data == NULL) {\r
439 printf("YM2612ResetChip_940: reset before init?\n");\r
440 return;\r
441 }\r
442\r
443 internal_reset();\r
444\r
445 add_job_940(JOB940_YM2612RESETCHIP);\r
446}\r
447\r
448\r
449int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)\r
450{\r
451 int *ym_buf = shared_data->ym_buffer;\r
452 int ym_active_chs;\r
453\r
454 //printf("YM2612UpdateOne_940()\n");\r
455\r
456 if (CHECK_BUSY(JOB940_YM2612UPDATEONE)) wait_busy_940(JOB940_YM2612UPDATEONE);\r
457\r
458 ym_active_chs = shared_ctl->ym_active_chs;\r
459\r
460 // mix in ym buffer. is_buf_empty means nobody mixed there anything yet and it may contain trash\r
461 if (is_buf_empty && ym_active_chs) memcpy32(buffer, ym_buf, length<<stereo);\r
462 else memset32(buffer, 0, length<<stereo);\r
463\r
464 if (shared_ctl->writebuffsel == 1) {\r
465 shared_ctl->writebuff0[writebuff_ptr & 0xffff] = 0xffff;\r
466 } else {\r
467 shared_ctl->writebuff1[writebuff_ptr & 0xffff] = 0xffff;\r
468 }\r
469 writebuff_ptr = 0;\r
470\r
471 /* predict sample counter for next frame */\r
472 if (PsndLen_exc_add) {\r
473 if (PsndLen_exc_cnt + PsndLen_exc_add >= 0x10000) length = PsndLen + 1;\r
474 else length = PsndLen;\r
475 }\r
476\r
477 /* give 940 ym job */\r
478 shared_ctl->writebuffsel ^= 1;\r
479 shared_ctl->length = length;\r
480 shared_ctl->stereo = stereo;\r
481\r
482 add_job_940(JOB940_YM2612UPDATEONE);\r
483\r
484 return ym_active_chs;\r
485}\r
486\r
487\r
488static int mp3_samples_ready = 0, mp3_buffer_offs = 0;\r
489static int mp3_play_bufsel = 0, mp3_job_started = 0;\r
490\r
491void mp3_update(int *buffer, int length, int stereo)\r
492{\r
493 int length_mp3;\r
494 int cdda_on;\r
495\r
496 // playback was started, track not ended\r
497 cdda_on = loaded_mp3 && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r
498\r
499 if (!cdda_on) return;\r
500\r
501 if (!(PicoOpt&0x200)) {\r
502 mp3_update_local(buffer, length, stereo);\r
503 return;\r
504 }\r
505\r
506 length_mp3 = length;\r
507 if (PsndRate == 22050) length_mp3 <<= 1; // mp3s are locked to 44100Hz stereo\r
508 else if (PsndRate == 11025) length_mp3 <<= 2; // so make length 44100ish\r
509\r
510 /* do we have to wait? */\r
511 if (mp3_job_started && mp3_samples_ready < length_mp3) {\r
512 if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
513 mp3_job_started = 0;\r
514 mp3_samples_ready += 1152;\r
515 }\r
516\r
517 /* mix mp3 data, only stereo */\r
518 if (mp3_samples_ready >= length_mp3)\r
519 {\r
520 int shr = 0;\r
521 void (*mix_samples)(int *dest_buf, short *mp3_buf, int count) = mix_16h_to_32;\r
522 if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }\r
523 else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }\r
524\r
525 if (1152 - mp3_buffer_offs >= length_mp3) {\r
526 mix_samples(buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);\r
527\r
528 mp3_buffer_offs += length_mp3;\r
529 } else {\r
530 // collect samples from both buffers..\r
531 int left = 1152 - mp3_buffer_offs;\r
532 if (mp3_play_bufsel == 0)\r
533 {\r
534 mix_samples(buffer, shared_data->mp3_buffer[0] + mp3_buffer_offs*2, length<<1);\r
535 mp3_buffer_offs = length_mp3 - left;\r
536 mp3_play_bufsel = 1;\r
537 } else {\r
538 mix_samples(buffer, shared_data->mp3_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);\r
539 mp3_buffer_offs = length_mp3 - left;\r
540 mix_samples(buffer + ((left>>shr)<<1),\r
541 shared_data->mp3_buffer[0], (mp3_buffer_offs>>shr)<<1);\r
542 mp3_play_bufsel = 0;\r
543 }\r
544 }\r
545 mp3_samples_ready -= length_mp3;\r
546 }\r
547\r
548 // ask to decode more if we already can\r
549 if (!mp3_job_started)\r
550 {\r
551 mp3_job_started = 1;\r
552 shared_ctl->mp3_buffsel ^= 1;\r
553 add_job_940(JOB940_MP3DECODE);\r
554 }\r
555}\r
556\r
557\r
558/***********************************************************/\r
559\r
560void mp3_start_play(FILE *f, int pos) // pos is 0-1023\r
561{\r
562 int byte_offs = 0;\r
563\r
564 if (!(PicoOpt&0x800)) { // cdda disabled?\r
565 return;\r
566 }\r
567\r
568 if (loaded_mp3 != f)\r
569 {\r
570 if (PicoMessage != NULL)\r
571 {\r
572 fseek(f, 0, SEEK_END);\r
573 if (ftell(f) > 2*1024*1024)\r
574 PicoMessage("Loading MP3...");\r
575 }\r
576 fseek(f, 0, SEEK_SET);\r
577 fread(mp3_mem, 1, MP3_SIZE_MAX, f);\r
578 if (!feof(f)) printf("Warning: mp3 was too large, not all data loaded.\n");\r
579 shared_ctl->mp3_len = ftell(f);\r
580 loaded_mp3 = f;\r
581\r
582 if (PicoOpt&0x200) {\r
583 // as we are going to change 940's cacheable area, we must invalidate it's cache..\r
584 if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
585 add_job_940(JOB940_INVALIDATE_DCACHE);\r
586 }\r
587 reset_timing = 1;\r
588 }\r
589\r
590 // seek..\r
591 if (pos) {\r
592 byte_offs = (shared_ctl->mp3_len << 6) >> 10;\r
593 byte_offs *= pos;\r
594 byte_offs >>= 6;\r
595 }\r
596 // printf("mp3 pos1024: %i, byte_offs %i/%i\n", pos, byte_offs, shared_ctl->mp3_len);\r
597\r
598 shared_ctl->mp3_offs = byte_offs;\r
599\r
600 // reset buffer pointers and stuff..\r
601 mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;\r
602 mp3_job_started = 0;\r
603 shared_ctl->mp3_buffsel = 1; // will change to 0 on first decode\r
604\r
605 if (!(PicoOpt&0x200)) mp3_start_local();\r
606}\r
607\r
608\r
609int mp3_get_offset(void)\r
610{\r
611 unsigned int offs1024 = 0;\r
612 int cdda_on;\r
613\r
614 cdda_on = (PicoAHW & PAHW_MCD) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r
615 (Pico_mcd->scd.Status_CDC & 1) && loaded_mp3;\r
616\r
617 if (cdda_on) {\r
618 offs1024 = shared_ctl->mp3_offs << 7;\r
619 offs1024 /= shared_ctl->mp3_len >> 3;\r
620 }\r
621 printf("offs1024=%u (%i/%i)\n", offs1024, shared_ctl->mp3_offs, shared_ctl->mp3_len);\r
622\r
623 return offs1024;\r
624}\r
625\r
626\r
fast MegaDrive/MegaCD/32X emulator