notaz.gp2x.de / picodrive.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
input: get rid of pl2 flag, use 'bind types' instead
[picodrive.git] / platform / gp2x / 940ctl.c
CommitLineData
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
42171343 14#include "soc_mmsp2.h"\r
15#include "soc.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 24static unsigned char *shared_mem = 0;\r
25static _940_data_t *shared_data = 0;\r
abe0ea43 26_940_ctl_t *shared_ctl = 0;\r
27unsigned char *mp3_mem = 0;\r
cb0316e4 28\r
e362c573 29#define MP3_SIZE_MAX (0x400000 + 0x800000) // 12M\r
e4fb433c 30#define CODE940_FILE "pico940_v3.bin"\r
cc68a136 31\r
32int crashed_940 = 0;\r
33\r
51a902ae 34static FILE *loaded_mp3 = 0;\r
cc68a136 35\r
36/***********************************************************/\r
37\r
38#define MAXOUT (+32767)\r
39#define MINOUT (-32768)\r
40\r
41/* limitter */\r
42#define Limit(val, max,min) { \\r
43 if ( val > max ) val = max; \\r
44 else if ( val < min ) val = min; \\r
45}\r
46\r
47/* these will be managed locally on our side */\r
cc68a136 48static UINT8 ST_address; /* address register */\r
4b9c5888 49static INT32 addr_A1; /* address line A1 */\r
cc68a136 50\r
51static int writebuff_ptr = 0;\r
52\r
53\r
cc68a136 54/* YM2612 write */\r
55/* a = address */\r
56/* v = value */\r
57/* returns 1 if sample affecting state changed */\r
4b9c5888 58int YM2612Write_940(unsigned int a, unsigned int v, int scanline)\r
cc68a136 59{\r
2433f409 60 int upd = 1; /* the write affects sample generation */\r
cc68a136 61\r
cc68a136 62 a &= 3;\r
63\r
2433f409 64 //printf("%05i:%03i: ym w ([%i] %02x)\n", Pico.m.frame_count, Pico.m.scanline, a, v);\r
65\r
e4fb433c 66 switch (a)\r
67 {\r
4b9c5888 68 case 0: /* address port 0 */\r
69 if (addr_A1 == 0 && ST_address == v)\r
70 return 0; /* address already selected, don't send this command to 940 */\r
71 ST_address = v;\r
72 addr_A1 = 0;\r
73 /* don't send DAC or timer related address changes to 940 */\r
74 if (v == 0x24 || v == 0x25 || v == 0x26 || v == 0x2a)\r
4ff2d527 75 return 0;\r
4b9c5888 76 upd = 0;\r
77 break;\r
cc68a136 78\r
4b9c5888 79 case 2: /* address port 1 */\r
80 if (addr_A1 == 1 && ST_address == v)\r
cc68a136 81 return 0;\r
4b9c5888 82 ST_address = v;\r
83 addr_A1 = 1;\r
84 upd = 0;\r
cc68a136 85 break;\r
cc68a136 86 }\r
87\r
2433f409 88 //printf("ym pass\n");\r
89\r
4b9c5888 90 if (currentConfig.EmuOpt & 4)\r
91 {\r
2433f409 92 UINT16 *writebuff = shared_ctl->writebuffsel ? shared_ctl->writebuff0 : shared_ctl->writebuff1;\r
93\r
94 /* detect rapid ym updates */\r
4b9c5888 95 if (upd && !(writebuff_ptr & 0x80000000) && scanline < 224)\r
96 {\r
2433f409 97 int mid = Pico.m.pal ? 68 : 93;\r
4b9c5888 98 if (scanline > mid) {\r
99 //printf("%05i:%03i: rapid ym\n", Pico.m.frame_count, scanline);\r
2433f409 100 writebuff[writebuff_ptr++ & 0xffff] = 0xfffe;\r
101 writebuff_ptr |= 0x80000000;\r
4b9c5888 102 //printf("%05i:%03i: ym w ([%02x] %02x, upd=%i)\n", Pico.m.frame_count, scanline, addr, v, upd);\r
cc68a136 103 }\r
2433f409 104 }\r
105\r
106 /* queue this write for 940 */\r
107 if ((writebuff_ptr&0xffff) < 2047) {\r
108 writebuff[writebuff_ptr++ & 0xffff] = (a<<8)|v;\r
cc68a136 109 } else {\r
4ff2d527 110 printf("warning: writebuff_ptr > 2047 ([%i] %02x)\n", a, v);\r
cc68a136 111 }\r
112 }\r
113\r
114 return 0; // cause the engine to do updates once per frame only\r
115}\r
116\r
cc68a136 117\r
abe0ea43 118#define CHECK_BUSY(job) \\r
119 (gp2x_memregs[0x3b46>>1] & (1<<(job-1)))\r
120\r
121static void wait_busy_940(int job)\r
cc68a136 122{\r
123 int i;\r
cc68a136 124\r
abe0ea43 125 job--;\r
126 for (i = 0; (gp2x_memregs[0x3b46>>1] & (1<<job)) && i < 0x10000; i++)\r
42c7b147 127 spend_cycles(8*1024); // tested to be best for mp3 dec\r
cc68a136 128 if (i < 0x10000) return;\r
129\r
130 /* 940 crashed */\r
42c7b147 131 printf("940 crashed (cnt: %i, ve: ", shared_ctl->loopc);\r
cc68a136 132 for (i = 0; i < 8; i++)\r
133 printf("%i ", shared_ctl->vstarts[i]);\r
134 printf(")\n");\r
abe0ea43 135 printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
4f265db7 136 gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
abe0ea43 137 printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
4f265db7 138 printf("trying to interrupt..\n");\r
139 gp2x_memregs[0x3B3E>>1] = 0xffff;\r
abe0ea43 140 for (i = 0; gp2x_memregs[0x3b46>>1] && i < 0x10000; i++)\r
4f265db7 141 spend_cycles(8*1024);\r
142 printf("i = 0x%x\n", i);\r
abe0ea43 143 printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
4f265db7 144 gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
abe0ea43 145 printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
4f265db7 146\r
c6c6c9cd 147 me_update_msg("940 crashed, too much overclock?");\r
cc68a136 148 engineState = PGS_Menu;\r
149 crashed_940 = 1;\r
cc68a136 150}\r
151\r
152\r
abe0ea43 153static void add_job_940(int job)\r
cc68a136 154{\r
abe0ea43 155 if (job <= 0 || job > 16) {\r
156 printf("add_job_940: bad job: %i\n", job);\r
157 return;\r
4f265db7 158 }\r
abe0ea43 159\r
160 // generate interrupt for this job\r
161 job--;\r
162 gp2x_memregs[(0x3B20+job*2)>>1] = 1;\r
163\r
164// printf("added %i, pending %04x\n", job+1, gp2x_memregs[0x3b46>>1]);\r
cc68a136 165}\r
166\r
167\r
168void YM2612PicoStateLoad_940(void)\r
169{\r
4b9c5888 170 UINT8 *REGS = YM2612GetRegs();\r
171\r
d5d11924 172 /* make sure JOB940_PICOSTATELOAD gets done before next JOB940_YM2612UPDATEONE */\r
173 add_job_940(JOB940_PICOSTATELOAD);\r
174 if (CHECK_BUSY(JOB940_PICOSTATELOAD)) wait_busy_940(JOB940_PICOSTATELOAD);\r
175\r
176 writebuff_ptr = 0;\r
4b9c5888 177 addr_A1 = *(INT32 *) (REGS + 0x200);\r
cc68a136 178}\r
179\r
e4fb433c 180void YM2612PicoStateSave2_940(int tat, int tbt)\r
181{\r
182 UINT8 *ym_remote_regs, *ym_local_regs;\r
183 add_job_940(JOB940_PICOSTATESAVE2);\r
184 if (CHECK_BUSY(JOB940_PICOSTATESAVE2)) wait_busy_940(JOB940_PICOSTATESAVE2);\r
185\r
186 ym_remote_regs = (UINT8 *) shared_ctl->writebuff0;\r
187 ym_local_regs = YM2612GetRegs();\r
188 if (*(UINT32 *)(ym_remote_regs + 0x100) != 0x41534d59) {\r
189 printf("code940 didn't return valid save data\n");\r
190 return;\r
191 }\r
192\r
193 /* copy addin data only */\r
194 memcpy(ym_local_regs, ym_remote_regs, 0x20);\r
195 memcpy(ym_local_regs + 0x100, ym_remote_regs + 0x100, 0x30);\r
196 memcpy(ym_local_regs + 0x0b8, ym_remote_regs + 0x0b8, 0x48);\r
197 memcpy(ym_local_regs + 0x1b8, ym_remote_regs + 0x1b8, 0x48);\r
198 *(INT32 *)(ym_local_regs + 0x108) = tat;\r
199 *(INT32 *)(ym_local_regs + 0x10c) = tbt;\r
200}\r
201\r
202int YM2612PicoStateLoad2_940(int *tat, int *tbt)\r
203{\r
204 UINT8 *ym_remote_regs, *ym_local_regs;\r
205 ym_local_regs = YM2612GetRegs();\r
206 ym_remote_regs = (UINT8 *) shared_ctl->writebuff0;\r
207\r
208 if (*(UINT32 *)(ym_local_regs + 0x100) != 0x41534d59)\r
209 return -1;\r
210\r
211 *tat = *(INT32 *)(ym_local_regs + 0x108);\r
212 *tbt = *(INT32 *)(ym_local_regs + 0x10c);\r
213\r
214 if (CHECK_BUSY(JOB940_YM2612UPDATEONE)) wait_busy_940(JOB940_YM2612UPDATEONE);\r
215\r
216 /* flush writes */\r
217 if (shared_ctl->writebuffsel == 1) {\r
218 shared_ctl->writebuff0[writebuff_ptr & 0xffff] = 0xffff;\r
219 } else {\r
220 shared_ctl->writebuff1[writebuff_ptr & 0xffff] = 0xffff;\r
221 }\r
222 shared_ctl->writebuffsel ^= 1;\r
223 writebuff_ptr = 0;\r
224 add_job_940(JOB940_PICOSTATELOAD2_PREP);\r
225 if (CHECK_BUSY(JOB940_PICOSTATELOAD2_PREP)) wait_busy_940(JOB940_PICOSTATELOAD2_PREP);\r
226\r
227 memcpy(ym_remote_regs, ym_local_regs, 0x200);\r
228\r
229 add_job_940(JOB940_PICOSTATELOAD2);\r
230 if (CHECK_BUSY(JOB940_PICOSTATELOAD2)) wait_busy_940(JOB940_PICOSTATELOAD2);\r
231\r
232 return 0;\r
233}\r
234\r
cc68a136 235\r
236static void internal_reset(void)\r
237{\r
238 writebuff_ptr = 0;\r
4b9c5888 239 ST_address = addr_A1 = -1;\r
cc68a136 240}\r
241\r
242\r
f80d67e1 243/* this must be called after mmu hack, the allocated regions must not get cached */\r
0d9bf4fc 244void sharedmem940_init(void)\r
f80d67e1 245{\r
246 if (shared_mem != NULL) return;\r
247\r
248 shared_mem = (unsigned char *) mmap(0, 0x210000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2000000);\r
e4fb433c 249 if (shared_mem == MAP_FAILED)\r
f80d67e1 250 {\r
251 printf("mmap(shared_data) failed with %i\n", errno);\r
252 exit(1);\r
253 }\r
254 shared_data = (_940_data_t *) (shared_mem+0x100000);\r
255 /* this area must not get buffered on either side */\r
256 shared_ctl = (_940_ctl_t *) (shared_mem+0x200000);\r
e362c573 257 mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2400000);\r
f80d67e1 258 if (mp3_mem == MAP_FAILED)\r
259 {\r
260 printf("mmap(mp3_mem) failed with %i\n", errno);\r
261 exit(1);\r
262 }\r
263 crashed_940 = 1;\r
264}\r
265\r
266\r
0d9bf4fc 267void sharedmem940_finish(void)\r
85f8e929 268{\r
269 munmap(shared_mem, 0x210000);\r
270 munmap(mp3_mem, MP3_SIZE_MAX);\r
271 shared_mem = mp3_mem = NULL;\r
272 shared_data = NULL;\r
273 shared_ctl = NULL;\r
274}\r
275\r
276\r
cc68a136 277extern char **g_argv;\r
278\r
cc68a136 279void YM2612Init_940(int baseclock, int rate)\r
280{\r
281 printf("YM2612Init_940()\n");\r
b837b69b 282 printf("Mem usage: shared_data: %i, shared_ctl: %i\n", sizeof(*shared_data), sizeof(*shared_ctl));\r
cc68a136 283\r
42171343 284 reset940(1, 2);\r
285 pause940(1);\r
cc68a136 286\r
4f265db7 287 gp2x_memregs[0x3B40>>1] = 0; // disable DUALCPU interrupts for 920\r
288 gp2x_memregs[0x3B42>>1] = 1; // enable DUALCPU interrupts for 940\r
cc68a136 289\r
abe0ea43 290 gp2x_memregl[0x4504>>2] = 0; // make sure no FIQs will be generated\r
291 gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r
292\r
293\r
cc68a136 294 if (crashed_940)\r
295 {\r
296 unsigned char ucData[1024];\r
297 int nRead, i, nLen = 0;\r
298 char binpath[1024];\r
299 FILE *fp;\r
300\r
301 strncpy(binpath, g_argv[0], 1023);\r
302 binpath[1023] = 0;\r
303 for (i = strlen(binpath); i > 0; i--)\r
304 if (binpath[i] == '/') { binpath[i] = 0; break; }\r
d524c827 305 strcat(binpath, "/" CODE940_FILE);\r
cc68a136 306\r
307 fp = fopen(binpath, "rb");\r
308 if(!fp)\r
309 {\r
e2de9939 310 memset(g_screen_ptr, 0, 320*240*2);\r
a12e0116 311 text_out16(10, 100, "failed to open required file:");\r
312 text_out16(10, 110, CODE940_FILE);\r
313 gp2x_video_flip2();\r
cc68a136 314 printf("failed to open %s\n", binpath);\r
315 exit(1);\r
316 }\r
317\r
318 while(1)\r
319 {\r
320 nRead = fread(ucData, 1, 1024, fp);\r
321 if(nRead <= 0)\r
322 break;\r
323 memcpy(shared_mem + nLen, ucData, nRead);\r
324 nLen += nRead;\r
325 }\r
326 fclose(fp);\r
327 crashed_940 = 0;\r
328 }\r
329\r
330 memset(shared_data, 0, sizeof(*shared_data));\r
331 memset(shared_ctl, 0, sizeof(*shared_ctl));\r
332\r
5f8c85be 333 /* cause local ym2612 to init REGS */\r
334 YM2612Init_(baseclock, rate);\r
335\r
cc68a136 336 internal_reset();\r
337\r
51a902ae 338 loaded_mp3 = 0;\r
339\r
4f265db7 340 gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r
abe0ea43 341 gp2x_memregl[0x4500>>2] = 0xffffffff; // clear pending IRQs in SRCPND\r
342 gp2x_memregl[0x4510>>2] = 0xffffffff; // clear pending IRQs in INTPND\r
cc68a136 343\r
344 /* start the 940 */\r
42171343 345 reset940(0, 2);\r
346 pause940(0);\r
cc68a136 347\r
348 // YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\r
abe0ea43 349\r
350 /* now cause 940 to init it's ym2612 stuff */\r
351 shared_ctl->baseclock = baseclock;\r
352 shared_ctl->rate = rate;\r
353 add_job_940(JOB940_INITALL);\r
cc68a136 354}\r
355\r
356\r
357void YM2612ResetChip_940(void)\r
358{\r
daec7253 359 //printf("YM2612ResetChip_940()\n");\r
cc68a136 360 if (shared_data == NULL) {\r
361 printf("YM2612ResetChip_940: reset before init?\n");\r
362 return;\r
363 }\r
364\r
4b9c5888 365 YM2612ResetChip_();\r
cc68a136 366 internal_reset();\r
367\r
abe0ea43 368 add_job_940(JOB940_YM2612RESETCHIP);\r
cc68a136 369}\r
370\r
371\r
abe0ea43 372int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)\r
cb0316e4 373{\r
abe0ea43 374 int *ym_buf = shared_data->ym_buffer;\r
85f8e929 375 int ym_active_chs;\r
4f265db7 376\r
abe0ea43 377 //printf("YM2612UpdateOne_940()\n");\r
378\r
379 if (CHECK_BUSY(JOB940_YM2612UPDATEONE)) wait_busy_940(JOB940_YM2612UPDATEONE);\r
380\r
85f8e929 381 ym_active_chs = shared_ctl->ym_active_chs;\r
abe0ea43 382\r
85f8e929 383 // mix in ym buffer. is_buf_empty means nobody mixed there anything yet and it may contain trash\r
384 if (is_buf_empty && ym_active_chs) memcpy32(buffer, ym_buf, length<<stereo);\r
385 else memset32(buffer, 0, length<<stereo);\r
abe0ea43 386\r
387 if (shared_ctl->writebuffsel == 1) {\r
2433f409 388 shared_ctl->writebuff0[writebuff_ptr & 0xffff] = 0xffff;\r
4f265db7 389 } else {\r
2433f409 390 shared_ctl->writebuff1[writebuff_ptr & 0xffff] = 0xffff;\r
cb0316e4 391 }\r
abe0ea43 392 writebuff_ptr = 0;\r
393\r
394 /* predict sample counter for next frame */\r
395 if (PsndLen_exc_add) {\r
52250671 396 length = PsndLen;\r
397 if (PsndLen_exc_cnt + PsndLen_exc_add >= 0x10000) length++;\r
abe0ea43 398 }\r
399\r
400 /* give 940 ym job */\r
401 shared_ctl->writebuffsel ^= 1;\r
402 shared_ctl->length = length;\r
403 shared_ctl->stereo = stereo;\r
404\r
405 add_job_940(JOB940_YM2612UPDATEONE);\r
406\r
85f8e929 407 return ym_active_chs;\r
cb0316e4 408}\r
cb0316e4 409\r
cb0316e4 410\r
51a902ae 411static int mp3_samples_ready = 0, mp3_buffer_offs = 0;\r
abe0ea43 412static int mp3_play_bufsel = 0, mp3_job_started = 0;\r
cb0316e4 413\r
abe0ea43 414void mp3_update(int *buffer, int length, int stereo)\r
cc68a136 415{\r
abe0ea43 416 int length_mp3;\r
417 int cdda_on;\r
4f265db7 418\r
da42200b 419 // playback was started, track not ended\r
420 cdda_on = loaded_mp3 && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r
cc68a136 421\r
abe0ea43 422 if (!cdda_on) return;\r
cc68a136 423\r
abe0ea43 424 if (!(PicoOpt&0x200)) {\r
425 mp3_update_local(buffer, length, stereo);\r
426 return;\r
427 }\r
cc68a136 428\r
abe0ea43 429 length_mp3 = length;\r
430 if (PsndRate == 22050) length_mp3 <<= 1; // mp3s are locked to 44100Hz stereo\r
431 else if (PsndRate == 11025) length_mp3 <<= 2; // so make length 44100ish\r
4f265db7 432\r
abe0ea43 433 /* do we have to wait? */\r
434 if (mp3_job_started && mp3_samples_ready < length_mp3) {\r
435 if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
436 mp3_job_started = 0;\r
437 mp3_samples_ready += 1152;\r
438 }\r
cb0316e4 439\r
4f265db7 440 /* mix mp3 data, only stereo */\r
abe0ea43 441 if (mp3_samples_ready >= length_mp3)\r
cb0316e4 442 {\r
4f265db7 443 int shr = 0;\r
444 void (*mix_samples)(int *dest_buf, short *mp3_buf, int count) = mix_16h_to_32;\r
445 if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }\r
446 else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }\r
cb0316e4 447\r
4f265db7 448 if (1152 - mp3_buffer_offs >= length_mp3) {\r
abe0ea43 449 mix_samples(buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);\r
4f265db7 450\r
451 mp3_buffer_offs += length_mp3;\r
cb0316e4 452 } else {\r
abe0ea43 453 // collect samples from both buffers..\r
cb0316e4 454 int left = 1152 - mp3_buffer_offs;\r
4f265db7 455 if (mp3_play_bufsel == 0)\r
456 {\r
abe0ea43 457 mix_samples(buffer, shared_data->mp3_buffer[0] + mp3_buffer_offs*2, length<<1);\r
4f265db7 458 mp3_buffer_offs = length_mp3 - left;\r
459 mp3_play_bufsel = 1;\r
460 } else {\r
461 mix_samples(buffer, shared_data->mp3_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);\r
462 mp3_buffer_offs = length_mp3 - left;\r
463 mix_samples(buffer + ((left>>shr)<<1),\r
464 shared_data->mp3_buffer[0], (mp3_buffer_offs>>shr)<<1);\r
465 mp3_play_bufsel = 0;\r
466 }\r
cc68a136 467 }\r
4f265db7 468 mp3_samples_ready -= length_mp3;\r
cc68a136 469 }\r
470\r
abe0ea43 471 // ask to decode more if we already can\r
472 if (!mp3_job_started)\r
cb0316e4 473 {\r
abe0ea43 474 mp3_job_started = 1;\r
cb0316e4 475 shared_ctl->mp3_buffsel ^= 1;\r
abe0ea43 476 add_job_940(JOB940_MP3DECODE);\r
cb0316e4 477 }\r
cc68a136 478}\r
cb0316e4 479\r
480\r
481/***********************************************************/\r
482\r
483void mp3_start_play(FILE *f, int pos) // pos is 0-1023\r
484{\r
485 int byte_offs = 0;\r
486\r
1cd356a3 487 if (!(PicoOpt&0x800)) { // cdda disabled?\r
cb0316e4 488 return;\r
489 }\r
490\r
491 if (loaded_mp3 != f)\r
492 {\r
66fdc0f0 493 if (PicoMessage != NULL)\r
494 {\r
495 fseek(f, 0, SEEK_END);\r
496 if (ftell(f) > 2*1024*1024)\r
497 PicoMessage("Loading MP3...");\r
498 }\r
cb0316e4 499 fseek(f, 0, SEEK_SET);\r
500 fread(mp3_mem, 1, MP3_SIZE_MAX, f);\r
e362c573 501 if (!feof(f)) printf("Warning: mp3 was too large, not all data loaded.\n");\r
cb0316e4 502 shared_ctl->mp3_len = ftell(f);\r
503 loaded_mp3 = f;\r
abe0ea43 504\r
091facb8 505 if (PicoOpt & POPT_EXT_FM) {\r
abe0ea43 506 // as we are going to change 940's cacheable area, we must invalidate it's cache..\r
507 if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
508 add_job_940(JOB940_INVALIDATE_DCACHE);\r
509 }\r
00bd648e 510 reset_timing = 1;\r
cb0316e4 511 }\r
512\r
513 // seek..\r
514 if (pos) {\r
515 byte_offs = (shared_ctl->mp3_len << 6) >> 10;\r
516 byte_offs *= pos;\r
517 byte_offs >>= 6;\r
518 }\r
091facb8 519 printf(" mp3 pos1024: %i, byte_offs %i/%i\n", pos, byte_offs, shared_ctl->mp3_len);\r
cb0316e4 520\r
521 shared_ctl->mp3_offs = byte_offs;\r
51a902ae 522\r
abe0ea43 523 // reset buffer pointers and stuff..\r
51a902ae 524 mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;\r
abe0ea43 525 mp3_job_started = 0;\r
51a902ae 526 shared_ctl->mp3_buffsel = 1; // will change to 0 on first decode\r
abe0ea43 527\r
091facb8 528 if (PicoOpt & POPT_EXT_FM)\r
529 {\r
530 add_job_940(JOB940_MP3RESET);\r
531 if (CHECK_BUSY(JOB940_MP3RESET)) wait_busy_940(JOB940_MP3RESET);\r
532 }\r
533 else\r
534 mp3_start_local();\r
cb0316e4 535}\r
536\r
537\r
75736070 538int mp3_get_offset(void)\r
539{\r
da42200b 540 unsigned int offs1024 = 0;\r
75736070 541 int cdda_on;\r
542\r
602133e1 543 cdda_on = (PicoAHW & PAHW_MCD) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r
abe0ea43 544 (Pico_mcd->scd.Status_CDC & 1) && loaded_mp3;\r
75736070 545\r
546 if (cdda_on) {\r
547 offs1024 = shared_ctl->mp3_offs << 7;\r
da42200b 548 offs1024 /= shared_ctl->mp3_len >> 3;\r
75736070 549 }\r
da42200b 550 printf("offs1024=%u (%i/%i)\n", offs1024, shared_ctl->mp3_offs, shared_ctl->mp3_len);\r
75736070 551\r
552 return offs1024;\r
553}\r
554\r
555\r
fast MegaDrive/MegaCD/32X emulator