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fix operator spr change ARM code bugs
[picodrive.git] / platform / gp2x / 940ctl.c
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6cadc2da 1// Code for communication with ARM940 and control of it.\r
2// (c) Copyright 2007, Grazvydas "notaz" Ignotas\r
3\r
cc68a136 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
42c7b147 13#include "code940/940shared.h"\r
cc68a136 14#include "gp2x.h"\r
15#include "emu.h"\r
da42200b 16#include "../common/mp3.h"\r
e5f426aa 17#include "../common/arm_utils.h"\r
18#include "../common/menu.h"\r
ea8c405f 19#include "../common/emu.h"\r
efcba75f 20#include "../../pico/pico_int.h"\r
21#include "../../pico/sound/ym2612.h"\r
22#include "../../pico/sound/mix.h"\r
4f265db7 23\r
cc68a136 24/* we will need some gp2x internals here */\r
25extern volatile unsigned short *gp2x_memregs; /* from minimal library rlyeh */\r
26extern volatile unsigned long *gp2x_memregl;\r
27\r
00bd648e 28extern int reset_timing;\r
cc68a136 29static unsigned char *shared_mem = 0;\r
30static _940_data_t *shared_data = 0;\r
abe0ea43 31_940_ctl_t *shared_ctl = 0;\r
32unsigned char *mp3_mem = 0;\r
cb0316e4 33\r
e362c573 34#define MP3_SIZE_MAX (0x400000 + 0x800000) // 12M\r
e4fb433c 35#define CODE940_FILE "pico940_v3.bin"\r
cc68a136 36\r
37int crashed_940 = 0;\r
38\r
51a902ae 39static FILE *loaded_mp3 = 0;\r
cc68a136 40\r
41/***********************************************************/\r
42\r
43#define MAXOUT (+32767)\r
44#define MINOUT (-32768)\r
45\r
46/* limitter */\r
47#define Limit(val, max,min) { \\r
48 if ( val > max ) val = max; \\r
49 else if ( val < min ) val = min; \\r
50}\r
51\r
52/* these will be managed locally on our side */\r
cc68a136 53static UINT8 ST_address; /* address register */\r
4b9c5888 54static INT32 addr_A1; /* address line A1 */\r
cc68a136 55\r
56static int writebuff_ptr = 0;\r
57\r
58\r
cc68a136 59/* YM2612 write */\r
60/* a = address */\r
61/* v = value */\r
62/* returns 1 if sample affecting state changed */\r
4b9c5888 63int YM2612Write_940(unsigned int a, unsigned int v, int scanline)\r
cc68a136 64{\r
2433f409 65 int upd = 1; /* the write affects sample generation */\r
cc68a136 66\r
cc68a136 67 a &= 3;\r
68\r
2433f409 69 //printf("%05i:%03i: ym w ([%i] %02x)\n", Pico.m.frame_count, Pico.m.scanline, a, v);\r
70\r
e4fb433c 71 switch (a)\r
72 {\r
4b9c5888 73 case 0: /* address port 0 */\r
74 if (addr_A1 == 0 && ST_address == v)\r
75 return 0; /* address already selected, don't send this command to 940 */\r
76 ST_address = v;\r
77 addr_A1 = 0;\r
78 /* don't send DAC or timer related address changes to 940 */\r
79 if (v == 0x24 || v == 0x25 || v == 0x26 || v == 0x2a)\r
4ff2d527 80 return 0;\r
4b9c5888 81 upd = 0;\r
82 break;\r
cc68a136 83\r
4b9c5888 84 case 2: /* address port 1 */\r
85 if (addr_A1 == 1 && ST_address == v)\r
cc68a136 86 return 0;\r
4b9c5888 87 ST_address = v;\r
88 addr_A1 = 1;\r
89 upd = 0;\r
cc68a136 90 break;\r
cc68a136 91 }\r
92\r
2433f409 93 //printf("ym pass\n");\r
94\r
4b9c5888 95 if (currentConfig.EmuOpt & 4)\r
96 {\r
2433f409 97 UINT16 *writebuff = shared_ctl->writebuffsel ? shared_ctl->writebuff0 : shared_ctl->writebuff1;\r
98\r
99 /* detect rapid ym updates */\r
4b9c5888 100 if (upd && !(writebuff_ptr & 0x80000000) && scanline < 224)\r
101 {\r
2433f409 102 int mid = Pico.m.pal ? 68 : 93;\r
4b9c5888 103 if (scanline > mid) {\r
104 //printf("%05i:%03i: rapid ym\n", Pico.m.frame_count, scanline);\r
2433f409 105 writebuff[writebuff_ptr++ & 0xffff] = 0xfffe;\r
106 writebuff_ptr |= 0x80000000;\r
4b9c5888 107 //printf("%05i:%03i: ym w ([%02x] %02x, upd=%i)\n", Pico.m.frame_count, scanline, addr, v, upd);\r
cc68a136 108 }\r
2433f409 109 }\r
110\r
111 /* queue this write for 940 */\r
112 if ((writebuff_ptr&0xffff) < 2047) {\r
113 writebuff[writebuff_ptr++ & 0xffff] = (a<<8)|v;\r
cc68a136 114 } else {\r
4ff2d527 115 printf("warning: writebuff_ptr > 2047 ([%i] %02x)\n", a, v);\r
cc68a136 116 }\r
117 }\r
118\r
119 return 0; // cause the engine to do updates once per frame only\r
120}\r
121\r
cc68a136 122\r
abe0ea43 123#define CHECK_BUSY(job) \\r
124 (gp2x_memregs[0x3b46>>1] & (1<<(job-1)))\r
125\r
126static void wait_busy_940(int job)\r
cc68a136 127{\r
128 int i;\r
cc68a136 129\r
abe0ea43 130 job--;\r
131 for (i = 0; (gp2x_memregs[0x3b46>>1] & (1<<job)) && i < 0x10000; i++)\r
42c7b147 132 spend_cycles(8*1024); // tested to be best for mp3 dec\r
cc68a136 133 if (i < 0x10000) return;\r
134\r
135 /* 940 crashed */\r
42c7b147 136 printf("940 crashed (cnt: %i, ve: ", shared_ctl->loopc);\r
cc68a136 137 for (i = 0; i < 8; i++)\r
138 printf("%i ", shared_ctl->vstarts[i]);\r
139 printf(")\n");\r
abe0ea43 140 printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
4f265db7 141 gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
abe0ea43 142 printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
4f265db7 143 printf("trying to interrupt..\n");\r
144 gp2x_memregs[0x3B3E>>1] = 0xffff;\r
abe0ea43 145 for (i = 0; gp2x_memregs[0x3b46>>1] && i < 0x10000; i++)\r
4f265db7 146 spend_cycles(8*1024);\r
147 printf("i = 0x%x\n", i);\r
abe0ea43 148 printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
4f265db7 149 gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
abe0ea43 150 printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
4f265db7 151\r
c6c6c9cd 152 me_update_msg("940 crashed, too much overclock?");\r
cc68a136 153 engineState = PGS_Menu;\r
154 crashed_940 = 1;\r
cc68a136 155}\r
156\r
157\r
abe0ea43 158static void add_job_940(int job)\r
cc68a136 159{\r
abe0ea43 160 if (job <= 0 || job > 16) {\r
161 printf("add_job_940: bad job: %i\n", job);\r
162 return;\r
4f265db7 163 }\r
abe0ea43 164\r
165 // generate interrupt for this job\r
166 job--;\r
167 gp2x_memregs[(0x3B20+job*2)>>1] = 1;\r
168\r
169// printf("added %i, pending %04x\n", job+1, gp2x_memregs[0x3b46>>1]);\r
cc68a136 170}\r
171\r
172\r
173void YM2612PicoStateLoad_940(void)\r
174{\r
4b9c5888 175 UINT8 *REGS = YM2612GetRegs();\r
176\r
d5d11924 177 /* make sure JOB940_PICOSTATELOAD gets done before next JOB940_YM2612UPDATEONE */\r
178 add_job_940(JOB940_PICOSTATELOAD);\r
179 if (CHECK_BUSY(JOB940_PICOSTATELOAD)) wait_busy_940(JOB940_PICOSTATELOAD);\r
180\r
181 writebuff_ptr = 0;\r
4b9c5888 182 addr_A1 = *(INT32 *) (REGS + 0x200);\r
cc68a136 183}\r
184\r
e4fb433c 185void YM2612PicoStateSave2_940(int tat, int tbt)\r
186{\r
187 UINT8 *ym_remote_regs, *ym_local_regs;\r
188 add_job_940(JOB940_PICOSTATESAVE2);\r
189 if (CHECK_BUSY(JOB940_PICOSTATESAVE2)) wait_busy_940(JOB940_PICOSTATESAVE2);\r
190\r
191 ym_remote_regs = (UINT8 *) shared_ctl->writebuff0;\r
192 ym_local_regs = YM2612GetRegs();\r
193 if (*(UINT32 *)(ym_remote_regs + 0x100) != 0x41534d59) {\r
194 printf("code940 didn't return valid save data\n");\r
195 return;\r
196 }\r
197\r
198 /* copy addin data only */\r
199 memcpy(ym_local_regs, ym_remote_regs, 0x20);\r
200 memcpy(ym_local_regs + 0x100, ym_remote_regs + 0x100, 0x30);\r
201 memcpy(ym_local_regs + 0x0b8, ym_remote_regs + 0x0b8, 0x48);\r
202 memcpy(ym_local_regs + 0x1b8, ym_remote_regs + 0x1b8, 0x48);\r
203 *(INT32 *)(ym_local_regs + 0x108) = tat;\r
204 *(INT32 *)(ym_local_regs + 0x10c) = tbt;\r
205}\r
206\r
207int YM2612PicoStateLoad2_940(int *tat, int *tbt)\r
208{\r
209 UINT8 *ym_remote_regs, *ym_local_regs;\r
210 ym_local_regs = YM2612GetRegs();\r
211 ym_remote_regs = (UINT8 *) shared_ctl->writebuff0;\r
212\r
213 if (*(UINT32 *)(ym_local_regs + 0x100) != 0x41534d59)\r
214 return -1;\r
215\r
216 *tat = *(INT32 *)(ym_local_regs + 0x108);\r
217 *tbt = *(INT32 *)(ym_local_regs + 0x10c);\r
218\r
219 if (CHECK_BUSY(JOB940_YM2612UPDATEONE)) wait_busy_940(JOB940_YM2612UPDATEONE);\r
220\r
221 /* flush writes */\r
222 if (shared_ctl->writebuffsel == 1) {\r
223 shared_ctl->writebuff0[writebuff_ptr & 0xffff] = 0xffff;\r
224 } else {\r
225 shared_ctl->writebuff1[writebuff_ptr & 0xffff] = 0xffff;\r
226 }\r
227 shared_ctl->writebuffsel ^= 1;\r
228 writebuff_ptr = 0;\r
229 add_job_940(JOB940_PICOSTATELOAD2_PREP);\r
230 if (CHECK_BUSY(JOB940_PICOSTATELOAD2_PREP)) wait_busy_940(JOB940_PICOSTATELOAD2_PREP);\r
231\r
232 memcpy(ym_remote_regs, ym_local_regs, 0x200);\r
233\r
234 add_job_940(JOB940_PICOSTATELOAD2);\r
235 if (CHECK_BUSY(JOB940_PICOSTATELOAD2)) wait_busy_940(JOB940_PICOSTATELOAD2);\r
236\r
237 return 0;\r
238}\r
239\r
cc68a136 240\r
241static void internal_reset(void)\r
242{\r
243 writebuff_ptr = 0;\r
4b9c5888 244 ST_address = addr_A1 = -1;\r
cc68a136 245}\r
246\r
247\r
f80d67e1 248/* this must be called after mmu hack, the allocated regions must not get cached */\r
249void sharedmem_init(void)\r
250{\r
251 if (shared_mem != NULL) return;\r
252\r
253 shared_mem = (unsigned char *) mmap(0, 0x210000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2000000);\r
e4fb433c 254 if (shared_mem == MAP_FAILED)\r
f80d67e1 255 {\r
256 printf("mmap(shared_data) failed with %i\n", errno);\r
257 exit(1);\r
258 }\r
259 shared_data = (_940_data_t *) (shared_mem+0x100000);\r
260 /* this area must not get buffered on either side */\r
261 shared_ctl = (_940_ctl_t *) (shared_mem+0x200000);\r
e362c573 262 mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2400000);\r
f80d67e1 263 if (mp3_mem == MAP_FAILED)\r
264 {\r
265 printf("mmap(mp3_mem) failed with %i\n", errno);\r
266 exit(1);\r
267 }\r
268 crashed_940 = 1;\r
269}\r
270\r
271\r
85f8e929 272void sharedmem_deinit(void)\r
273{\r
274 munmap(shared_mem, 0x210000);\r
275 munmap(mp3_mem, MP3_SIZE_MAX);\r
276 shared_mem = mp3_mem = NULL;\r
277 shared_data = NULL;\r
278 shared_ctl = NULL;\r
279}\r
280\r
281\r
cc68a136 282extern char **g_argv;\r
283\r
cc68a136 284void YM2612Init_940(int baseclock, int rate)\r
285{\r
286 printf("YM2612Init_940()\n");\r
b837b69b 287 printf("Mem usage: shared_data: %i, shared_ctl: %i\n", sizeof(*shared_data), sizeof(*shared_ctl));\r
cc68a136 288\r
b837b69b 289 Reset940(1, 2);\r
cc68a136 290 Pause940(1);\r
291\r
4f265db7 292 gp2x_memregs[0x3B40>>1] = 0; // disable DUALCPU interrupts for 920\r
293 gp2x_memregs[0x3B42>>1] = 1; // enable DUALCPU interrupts for 940\r
cc68a136 294\r
abe0ea43 295 gp2x_memregl[0x4504>>2] = 0; // make sure no FIQs will be generated\r
296 gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r
297\r
298\r
cc68a136 299 if (crashed_940)\r
300 {\r
301 unsigned char ucData[1024];\r
302 int nRead, i, nLen = 0;\r
303 char binpath[1024];\r
304 FILE *fp;\r
305\r
306 strncpy(binpath, g_argv[0], 1023);\r
307 binpath[1023] = 0;\r
308 for (i = strlen(binpath); i > 0; i--)\r
309 if (binpath[i] == '/') { binpath[i] = 0; break; }\r
d524c827 310 strcat(binpath, "/" CODE940_FILE);\r
cc68a136 311\r
312 fp = fopen(binpath, "rb");\r
313 if(!fp)\r
314 {\r
e2de9939 315 memset(g_screen_ptr, 0, 320*240*2);\r
a12e0116 316 text_out16(10, 100, "failed to open required file:");\r
317 text_out16(10, 110, CODE940_FILE);\r
318 gp2x_video_flip2();\r
cc68a136 319 printf("failed to open %s\n", binpath);\r
320 exit(1);\r
321 }\r
322\r
323 while(1)\r
324 {\r
325 nRead = fread(ucData, 1, 1024, fp);\r
326 if(nRead <= 0)\r
327 break;\r
328 memcpy(shared_mem + nLen, ucData, nRead);\r
329 nLen += nRead;\r
330 }\r
331 fclose(fp);\r
332 crashed_940 = 0;\r
333 }\r
334\r
335 memset(shared_data, 0, sizeof(*shared_data));\r
336 memset(shared_ctl, 0, sizeof(*shared_ctl));\r
337\r
5f8c85be 338 /* cause local ym2612 to init REGS */\r
339 YM2612Init_(baseclock, rate);\r
340\r
cc68a136 341 internal_reset();\r
342\r
51a902ae 343 loaded_mp3 = 0;\r
344\r
4f265db7 345 gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r
abe0ea43 346 gp2x_memregl[0x4500>>2] = 0xffffffff; // clear pending IRQs in SRCPND\r
347 gp2x_memregl[0x4510>>2] = 0xffffffff; // clear pending IRQs in INTPND\r
cc68a136 348\r
349 /* start the 940 */\r
b837b69b 350 Reset940(0, 2);\r
cc68a136 351 Pause940(0);\r
352\r
353 // YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\r
abe0ea43 354\r
355 /* now cause 940 to init it's ym2612 stuff */\r
356 shared_ctl->baseclock = baseclock;\r
357 shared_ctl->rate = rate;\r
358 add_job_940(JOB940_INITALL);\r
cc68a136 359}\r
360\r
361\r
362void YM2612ResetChip_940(void)\r
363{\r
daec7253 364 //printf("YM2612ResetChip_940()\n");\r
cc68a136 365 if (shared_data == NULL) {\r
366 printf("YM2612ResetChip_940: reset before init?\n");\r
367 return;\r
368 }\r
369\r
4b9c5888 370 YM2612ResetChip_();\r
cc68a136 371 internal_reset();\r
372\r
abe0ea43 373 add_job_940(JOB940_YM2612RESETCHIP);\r
cc68a136 374}\r
375\r
376\r
abe0ea43 377int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)\r
cb0316e4 378{\r
abe0ea43 379 int *ym_buf = shared_data->ym_buffer;\r
85f8e929 380 int ym_active_chs;\r
4f265db7 381\r
abe0ea43 382 //printf("YM2612UpdateOne_940()\n");\r
383\r
384 if (CHECK_BUSY(JOB940_YM2612UPDATEONE)) wait_busy_940(JOB940_YM2612UPDATEONE);\r
385\r
85f8e929 386 ym_active_chs = shared_ctl->ym_active_chs;\r
abe0ea43 387\r
85f8e929 388 // mix in ym buffer. is_buf_empty means nobody mixed there anything yet and it may contain trash\r
389 if (is_buf_empty && ym_active_chs) memcpy32(buffer, ym_buf, length<<stereo);\r
390 else memset32(buffer, 0, length<<stereo);\r
abe0ea43 391\r
392 if (shared_ctl->writebuffsel == 1) {\r
2433f409 393 shared_ctl->writebuff0[writebuff_ptr & 0xffff] = 0xffff;\r
4f265db7 394 } else {\r
2433f409 395 shared_ctl->writebuff1[writebuff_ptr & 0xffff] = 0xffff;\r
cb0316e4 396 }\r
abe0ea43 397 writebuff_ptr = 0;\r
398\r
399 /* predict sample counter for next frame */\r
400 if (PsndLen_exc_add) {\r
52250671 401 length = PsndLen;\r
402 if (PsndLen_exc_cnt + PsndLen_exc_add >= 0x10000) length++;\r
abe0ea43 403 }\r
404\r
405 /* give 940 ym job */\r
406 shared_ctl->writebuffsel ^= 1;\r
407 shared_ctl->length = length;\r
408 shared_ctl->stereo = stereo;\r
409\r
410 add_job_940(JOB940_YM2612UPDATEONE);\r
411\r
85f8e929 412 return ym_active_chs;\r
cb0316e4 413}\r
cb0316e4 414\r
cb0316e4 415\r
51a902ae 416static int mp3_samples_ready = 0, mp3_buffer_offs = 0;\r
abe0ea43 417static int mp3_play_bufsel = 0, mp3_job_started = 0;\r
cb0316e4 418\r
abe0ea43 419void mp3_update(int *buffer, int length, int stereo)\r
cc68a136 420{\r
abe0ea43 421 int length_mp3;\r
422 int cdda_on;\r
4f265db7 423\r
da42200b 424 // playback was started, track not ended\r
425 cdda_on = loaded_mp3 && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r
cc68a136 426\r
abe0ea43 427 if (!cdda_on) return;\r
cc68a136 428\r
abe0ea43 429 if (!(PicoOpt&0x200)) {\r
430 mp3_update_local(buffer, length, stereo);\r
431 return;\r
432 }\r
cc68a136 433\r
abe0ea43 434 length_mp3 = length;\r
435 if (PsndRate == 22050) length_mp3 <<= 1; // mp3s are locked to 44100Hz stereo\r
436 else if (PsndRate == 11025) length_mp3 <<= 2; // so make length 44100ish\r
4f265db7 437\r
abe0ea43 438 /* do we have to wait? */\r
439 if (mp3_job_started && mp3_samples_ready < length_mp3) {\r
440 if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
441 mp3_job_started = 0;\r
442 mp3_samples_ready += 1152;\r
443 }\r
cb0316e4 444\r
4f265db7 445 /* mix mp3 data, only stereo */\r
abe0ea43 446 if (mp3_samples_ready >= length_mp3)\r
cb0316e4 447 {\r
4f265db7 448 int shr = 0;\r
449 void (*mix_samples)(int *dest_buf, short *mp3_buf, int count) = mix_16h_to_32;\r
450 if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }\r
451 else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }\r
cb0316e4 452\r
4f265db7 453 if (1152 - mp3_buffer_offs >= length_mp3) {\r
abe0ea43 454 mix_samples(buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);\r
4f265db7 455\r
456 mp3_buffer_offs += length_mp3;\r
cb0316e4 457 } else {\r
abe0ea43 458 // collect samples from both buffers..\r
cb0316e4 459 int left = 1152 - mp3_buffer_offs;\r
4f265db7 460 if (mp3_play_bufsel == 0)\r
461 {\r
abe0ea43 462 mix_samples(buffer, shared_data->mp3_buffer[0] + mp3_buffer_offs*2, length<<1);\r
4f265db7 463 mp3_buffer_offs = length_mp3 - left;\r
464 mp3_play_bufsel = 1;\r
465 } else {\r
466 mix_samples(buffer, shared_data->mp3_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);\r
467 mp3_buffer_offs = length_mp3 - left;\r
468 mix_samples(buffer + ((left>>shr)<<1),\r
469 shared_data->mp3_buffer[0], (mp3_buffer_offs>>shr)<<1);\r
470 mp3_play_bufsel = 0;\r
471 }\r
cc68a136 472 }\r
4f265db7 473 mp3_samples_ready -= length_mp3;\r
cc68a136 474 }\r
475\r
abe0ea43 476 // ask to decode more if we already can\r
477 if (!mp3_job_started)\r
cb0316e4 478 {\r
abe0ea43 479 mp3_job_started = 1;\r
cb0316e4 480 shared_ctl->mp3_buffsel ^= 1;\r
abe0ea43 481 add_job_940(JOB940_MP3DECODE);\r
cb0316e4 482 }\r
cc68a136 483}\r
cb0316e4 484\r
485\r
486/***********************************************************/\r
487\r
488void mp3_start_play(FILE *f, int pos) // pos is 0-1023\r
489{\r
490 int byte_offs = 0;\r
491\r
1cd356a3 492 if (!(PicoOpt&0x800)) { // cdda disabled?\r
cb0316e4 493 return;\r
494 }\r
495\r
496 if (loaded_mp3 != f)\r
497 {\r
66fdc0f0 498 if (PicoMessage != NULL)\r
499 {\r
500 fseek(f, 0, SEEK_END);\r
501 if (ftell(f) > 2*1024*1024)\r
502 PicoMessage("Loading MP3...");\r
503 }\r
cb0316e4 504 fseek(f, 0, SEEK_SET);\r
505 fread(mp3_mem, 1, MP3_SIZE_MAX, f);\r
e362c573 506 if (!feof(f)) printf("Warning: mp3 was too large, not all data loaded.\n");\r
cb0316e4 507 shared_ctl->mp3_len = ftell(f);\r
508 loaded_mp3 = f;\r
abe0ea43 509\r
091facb8 510 if (PicoOpt & POPT_EXT_FM) {\r
abe0ea43 511 // as we are going to change 940's cacheable area, we must invalidate it's cache..\r
512 if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
513 add_job_940(JOB940_INVALIDATE_DCACHE);\r
514 }\r
00bd648e 515 reset_timing = 1;\r
cb0316e4 516 }\r
517\r
518 // seek..\r
519 if (pos) {\r
520 byte_offs = (shared_ctl->mp3_len << 6) >> 10;\r
521 byte_offs *= pos;\r
522 byte_offs >>= 6;\r
523 }\r
091facb8 524 printf(" mp3 pos1024: %i, byte_offs %i/%i\n", pos, byte_offs, shared_ctl->mp3_len);\r
cb0316e4 525\r
526 shared_ctl->mp3_offs = byte_offs;\r
51a902ae 527\r
abe0ea43 528 // reset buffer pointers and stuff..\r
51a902ae 529 mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;\r
abe0ea43 530 mp3_job_started = 0;\r
51a902ae 531 shared_ctl->mp3_buffsel = 1; // will change to 0 on first decode\r
abe0ea43 532\r
091facb8 533 if (PicoOpt & POPT_EXT_FM)\r
534 {\r
535 add_job_940(JOB940_MP3RESET);\r
536 if (CHECK_BUSY(JOB940_MP3RESET)) wait_busy_940(JOB940_MP3RESET);\r
537 }\r
538 else\r
539 mp3_start_local();\r
cb0316e4 540}\r
541\r
542\r
75736070 543int mp3_get_offset(void)\r
544{\r
da42200b 545 unsigned int offs1024 = 0;\r
75736070 546 int cdda_on;\r
547\r
602133e1 548 cdda_on = (PicoAHW & PAHW_MCD) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r
abe0ea43 549 (Pico_mcd->scd.Status_CDC & 1) && loaded_mp3;\r
75736070 550\r
551 if (cdda_on) {\r
552 offs1024 = shared_ctl->mp3_offs << 7;\r
da42200b 553 offs1024 /= shared_ctl->mp3_len >> 3;\r
75736070 554 }\r
da42200b 555 printf("offs1024=%u (%i/%i)\n", offs1024, shared_ctl->mp3_offs, shared_ctl->mp3_len);\r
75736070 556\r
557 return offs1024;\r
558}\r
559\r
560\r
fast MegaDrive/MegaCD/32X emulator