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[libpicofe.git] / gp2x / 940ctl.c
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6ab2f79c 1// Code for communication with ARM940 and control of it.\r
2// (c) Copyright 2007, Grazvydas "notaz" Ignotas\r
3\r
720ee7f6 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
b30a8e67 13#include "code940/940shared.h"\r
720ee7f6 14#include "gp2x.h"\r
15#include "emu.h"\r
16#include "menu.h"\r
17#include "asmutils.h"\r
edbb82f8 18#include "mp3.h"\r
598e7c06 19#include "../../Pico/PicoInt.h"\r
49fe50f0 20#include "../../Pico/sound/mix.h"\r
21\r
720ee7f6 22/* we will need some gp2x internals here */\r
23extern volatile unsigned short *gp2x_memregs; /* from minimal library rlyeh */\r
24extern volatile unsigned long *gp2x_memregl;\r
25\r
8f1b51ef 26extern int reset_timing;\r
720ee7f6 27static unsigned char *shared_mem = 0;\r
28static _940_data_t *shared_data = 0;\r
edbb82f8 29_940_ctl_t *shared_ctl = 0;\r
30unsigned char *mp3_mem = 0;\r
598e7c06 31\r
60b4b403 32#define MP3_SIZE_MAX (0x400000 + 0x800000) // 12M\r
95151aea 33#define CODE940_FILE "pico940.bin"\r
720ee7f6 34\r
35int crashed_940 = 0;\r
36\r
979ba09f 37static FILE *loaded_mp3 = 0;\r
720ee7f6 38\r
39/***********************************************************/\r
40\r
41#define MAXOUT (+32767)\r
42#define MINOUT (-32768)\r
43\r
44/* limitter */\r
45#define Limit(val, max,min) { \\r
46 if ( val > max ) val = max; \\r
47 else if ( val < min ) val = min; \\r
48}\r
49\r
50/* these will be managed locally on our side */\r
51extern int *ym2612_dacen;\r
52extern INT32 *ym2612_dacout;\r
53extern void *ym2612_regs;\r
54\r
55static UINT8 *REGS = 0; /* we will also keep local copy of regs for savestates and such */\r
56static INT32 addr_A1; /* address line A1 */\r
57static int dacen;\r
58static INT32 dacout;\r
59static UINT8 ST_address; /* address register */\r
60static UINT8 ST_status; /* status flag */\r
61static UINT8 ST_mode; /* mode CSM / 3SLOT */\r
62static int ST_TA; /* timer a */\r
63static int ST_TAC; /* timer a maxval */\r
64static int ST_TAT; /* timer a ticker */\r
65static UINT8 ST_TB; /* timer b */\r
66static int ST_TBC; /* timer b maxval */\r
67static int ST_TBT; /* timer b ticker */\r
68\r
69static int writebuff_ptr = 0;\r
70\r
71\r
72/* OPN Mode Register Write */\r
79cad122 73static int set_timers( int v )\r
720ee7f6 74{\r
79cad122 75 int change;\r
76\r
720ee7f6 77 /* b7 = CSM MODE */\r
78 /* b6 = 3 slot mode */\r
79 /* b5 = reset b */\r
80 /* b4 = reset a */\r
81 /* b3 = timer enable b */\r
82 /* b2 = timer enable a */\r
83 /* b1 = load b */\r
84 /* b0 = load a */\r
79cad122 85 change = (ST_mode ^ v) & 0xc0;\r
720ee7f6 86 ST_mode = v;\r
87\r
88 /* reset Timer b flag */\r
89 if( v & 0x20 )\r
90 ST_status &= ~2;\r
91\r
92 /* reset Timer a flag */\r
93 if( v & 0x10 )\r
94 ST_status &= ~1;\r
79cad122 95\r
96 return change;\r
720ee7f6 97}\r
98\r
99/* YM2612 write */\r
100/* a = address */\r
101/* v = value */\r
102/* returns 1 if sample affecting state changed */\r
103int YM2612Write_940(unsigned int a, unsigned int v)\r
104{\r
79cad122 105 int addr;\r
106 int upd = 1; /* the write affects sample generation */\r
720ee7f6 107\r
108 v &= 0xff; /* adjust to 8 bit bus */\r
109 a &= 3;\r
110\r
79cad122 111 //printf("%05i:%03i: ym w ([%i] %02x)\n", Pico.m.frame_count, Pico.m.scanline, a, v);\r
112\r
720ee7f6 113 switch( a ) {\r
114 case 0: /* address port 0 */\r
d032c15a 115 if (!addr_A1 && ST_address == v)\r
116 return 0; /* address already selected, don't send this command to 940 */\r
720ee7f6 117 ST_address = v;\r
d032c15a 118 /* don't send DAC or timer related address changes to 940 */\r
119 if (!addr_A1 && (v & 0xf0) == 0x20 &&\r
120 (v == 0x24 || v == 0x25 || v == 0x26 || v == 0x2a))\r
121 return 0;\r
720ee7f6 122 addr_A1 = 0;\r
79cad122 123 upd = 0;\r
720ee7f6 124 break;\r
125\r
126 case 1: /* data port 0 */\r
127 if (addr_A1 != 0) {\r
128 return 0; /* verified on real YM2608 */\r
129 }\r
130\r
131 addr = ST_address;\r
132 REGS[addr] = v;\r
133\r
134 switch( addr & 0xf0 )\r
135 {\r
136 case 0x20: /* 0x20-0x2f Mode */\r
137 switch( addr )\r
138 {\r
139 case 0x24: { // timer A High 8\r
140 int TAnew = (ST_TA & 0x03)|(((int)v)<<2);\r
141 if(ST_TA != TAnew) {\r
142 // we should reset ticker only if new value is written. Outrun requires this.\r
143 ST_TA = TAnew;\r
144 ST_TAC = (1024-TAnew)*18;\r
145 ST_TAT = 0;\r
146 }\r
147 return 0;\r
148 }\r
149 case 0x25: { // timer A Low 2\r
150 int TAnew = (ST_TA & 0x3fc)|(v&3);\r
151 if(ST_TA != TAnew) {\r
152 ST_TA = TAnew;\r
153 ST_TAC = (1024-TAnew)*18;\r
154 ST_TAT = 0;\r
155 }\r
156 return 0;\r
157 }\r
158 case 0x26: // timer B\r
159 if(ST_TB != v) {\r
160 ST_TB = v;\r
161 ST_TBC = (256-v)<<4;\r
162 ST_TBC *= 18;\r
163 ST_TBT = 0;\r
164 }\r
165 return 0;\r
166 case 0x27: /* mode, timer control */\r
79cad122 167 if (set_timers( v ))\r
168 break; // other side needs ST.mode for 3slot mode\r
169 return 0;\r
720ee7f6 170 case 0x2a: /* DAC data (YM2612) */\r
171 dacout = ((int)v - 0x80) << 6; /* level unknown (notaz: 8 seems to be too much) */\r
172 return 0;\r
173 case 0x2b: /* DAC Sel (YM2612) */\r
174 /* b7 = dac enable */\r
175 dacen = v & 0x80;\r
79cad122 176 upd = 0;\r
720ee7f6 177 break; // other side has to know this\r
178 default:\r
179 break;\r
180 }\r
181 break;\r
182 }\r
183 break;\r
184\r
185 case 2: /* address port 1 */\r
d032c15a 186 if (addr_A1 && ST_address == v)\r
187 return 0;\r
720ee7f6 188 ST_address = v;\r
189 addr_A1 = 1;\r
79cad122 190 upd = 0;\r
720ee7f6 191 break;\r
192\r
193 case 3: /* data port 1 */\r
194 if (addr_A1 != 1) {\r
195 return 0; /* verified on real YM2608 */\r
196 }\r
197\r
198 addr = ST_address | 0x100;\r
199 REGS[addr] = v;\r
200 break;\r
201 }\r
202\r
79cad122 203 //printf("ym pass\n");\r
204\r
720ee7f6 205 if(currentConfig.EmuOpt & 4) {\r
79cad122 206 UINT16 *writebuff = shared_ctl->writebuffsel ? shared_ctl->writebuff0 : shared_ctl->writebuff1;\r
207\r
208 /* detect rapid ym updates */\r
209 if (upd && !(writebuff_ptr & 0x80000000) && Pico.m.scanline < 224) {\r
210 int mid = Pico.m.pal ? 68 : 93;\r
211 if (Pico.m.scanline > mid) {\r
212 //printf("%05i:%03i: rapid ym\n", Pico.m.frame_count, Pico.m.scanline);\r
213 writebuff[writebuff_ptr++ & 0xffff] = 0xfffe;\r
214 writebuff_ptr |= 0x80000000;\r
215 //printf("%05i:%03i: ym w ([%02x] %02x, upd=%i)\n", Pico.m.frame_count, Pico.m.scanline, addr, v, upd);\r
720ee7f6 216 }\r
79cad122 217 }\r
218\r
219 /* queue this write for 940 */\r
220 if ((writebuff_ptr&0xffff) < 2047) {\r
221 writebuff[writebuff_ptr++ & 0xffff] = (a<<8)|v;\r
720ee7f6 222 } else {\r
d032c15a 223 printf("warning: writebuff_ptr > 2047 ([%i] %02x)\n", a, v);\r
720ee7f6 224 }\r
225 }\r
226\r
227 return 0; // cause the engine to do updates once per frame only\r
228}\r
229\r
230UINT8 YM2612Read_940(void)\r
231{\r
232 return ST_status;\r
233}\r
234\r
235\r
236int YM2612PicoTick_940(int n)\r
237{\r
238 //int ret = 0;\r
239\r
240 // timer A\r
241 if(ST_mode & 0x01 && (ST_TAT+=64*n) >= ST_TAC) {\r
242 ST_TAT -= ST_TAC;\r
243 if(ST_mode & 0x04) ST_status |= 1;\r
244 // CSM mode total level latch and auto key on\r
245/* FIXME\r
246 if(ST_mode & 0x80) {\r
247 CSMKeyControll( &(ym2612_940->CH[2]) ); // Vectorman2, etc.\r
248 ret = 1;\r
249 }\r
250*/\r
251 }\r
252\r
253 // timer B\r
254 if(ST_mode & 0x02 && (ST_TBT+=64*n) >= ST_TBC) {\r
255 ST_TBT -= ST_TBC;\r
256 if(ST_mode & 0x08) ST_status |= 2;\r
257 }\r
258\r
259 return 0;\r
260}\r
261\r
262\r
edbb82f8 263#define CHECK_BUSY(job) \\r
264 (gp2x_memregs[0x3b46>>1] & (1<<(job-1)))\r
265\r
266static void wait_busy_940(int job)\r
720ee7f6 267{\r
268 int i;\r
720ee7f6 269\r
edbb82f8 270 job--;\r
271 for (i = 0; (gp2x_memregs[0x3b46>>1] & (1<<job)) && i < 0x10000; i++)\r
b30a8e67 272 spend_cycles(8*1024); // tested to be best for mp3 dec\r
720ee7f6 273 if (i < 0x10000) return;\r
274\r
275 /* 940 crashed */\r
b30a8e67 276 printf("940 crashed (cnt: %i, ve: ", shared_ctl->loopc);\r
720ee7f6 277 for (i = 0; i < 8; i++)\r
278 printf("%i ", shared_ctl->vstarts[i]);\r
279 printf(")\n");\r
edbb82f8 280 printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
49fe50f0 281 gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
edbb82f8 282 printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
49fe50f0 283 printf("trying to interrupt..\n");\r
284 gp2x_memregs[0x3B3E>>1] = 0xffff;\r
edbb82f8 285 for (i = 0; gp2x_memregs[0x3b46>>1] && i < 0x10000; i++)\r
49fe50f0 286 spend_cycles(8*1024);\r
287 printf("i = 0x%x\n", i);\r
edbb82f8 288 printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
49fe50f0 289 gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
edbb82f8 290 printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
49fe50f0 291\r
6ab2f79c 292 strcpy(menuErrorMsg, "940 crashed, too much overclock?");\r
720ee7f6 293 engineState = PGS_Menu;\r
294 crashed_940 = 1;\r
720ee7f6 295}\r
296\r
297\r
edbb82f8 298static void add_job_940(int job)\r
720ee7f6 299{\r
edbb82f8 300 if (job <= 0 || job > 16) {\r
301 printf("add_job_940: bad job: %i\n", job);\r
302 return;\r
49fe50f0 303 }\r
edbb82f8 304\r
305 // generate interrupt for this job\r
306 job--;\r
307 gp2x_memregs[(0x3B20+job*2)>>1] = 1;\r
308\r
309// printf("added %i, pending %04x\n", job+1, gp2x_memregs[0x3b46>>1]);\r
720ee7f6 310}\r
311\r
312\r
313void YM2612PicoStateLoad_940(void)\r
314{\r
315 int i, old_A1 = addr_A1;\r
316\r
fb88e614 317 /* make sure JOB940_PICOSTATELOAD gets done before next JOB940_YM2612UPDATEONE */\r
318 add_job_940(JOB940_PICOSTATELOAD);\r
319 if (CHECK_BUSY(JOB940_PICOSTATELOAD)) wait_busy_940(JOB940_PICOSTATELOAD);\r
320\r
321 writebuff_ptr = 0;\r
322\r
720ee7f6 323 // feed all the registers and update internal state\r
324 for(i = 0; i < 0x100; i++) {\r
325 YM2612Write_940(0, i);\r
326 YM2612Write_940(1, REGS[i]);\r
327 }\r
328 for(i = 0; i < 0x100; i++) {\r
329 YM2612Write_940(2, i);\r
330 YM2612Write_940(3, REGS[i|0x100]);\r
331 }\r
332\r
333 addr_A1 = old_A1;\r
720ee7f6 334}\r
335\r
336\r
337static void internal_reset(void)\r
338{\r
339 writebuff_ptr = 0;\r
340 ST_mode = 0;\r
341 ST_status = 0; /* normal mode */\r
342 ST_TA = 0;\r
343 ST_TAC = 0;\r
344 ST_TB = 0;\r
345 ST_TBC = 0;\r
346 dacen = 0;\r
347}\r
348\r
349\r
52d3dd5f 350/* this must be called after mmu hack, the allocated regions must not get cached */\r
351void sharedmem_init(void)\r
352{\r
353 if (shared_mem != NULL) return;\r
354\r
355 shared_mem = (unsigned char *) mmap(0, 0x210000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2000000);\r
356 if(shared_mem == MAP_FAILED)\r
357 {\r
358 printf("mmap(shared_data) failed with %i\n", errno);\r
359 exit(1);\r
360 }\r
361 shared_data = (_940_data_t *) (shared_mem+0x100000);\r
362 /* this area must not get buffered on either side */\r
363 shared_ctl = (_940_ctl_t *) (shared_mem+0x200000);\r
60b4b403 364 mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2400000);\r
52d3dd5f 365 if (mp3_mem == MAP_FAILED)\r
366 {\r
367 printf("mmap(mp3_mem) failed with %i\n", errno);\r
368 exit(1);\r
369 }\r
370 crashed_940 = 1;\r
371}\r
372\r
373\r
4dfd9f42 374void sharedmem_deinit(void)\r
375{\r
376 munmap(shared_mem, 0x210000);\r
377 munmap(mp3_mem, MP3_SIZE_MAX);\r
378 shared_mem = mp3_mem = NULL;\r
379 shared_data = NULL;\r
380 shared_ctl = NULL;\r
381}\r
382\r
383\r
720ee7f6 384extern char **g_argv;\r
385\r
386/* none of the functions in this file should be called before this one */\r
387void YM2612Init_940(int baseclock, int rate)\r
388{\r
389 printf("YM2612Init_940()\n");\r
8dfb9fd5 390 printf("Mem usage: shared_data: %i, shared_ctl: %i\n", sizeof(*shared_data), sizeof(*shared_ctl));\r
720ee7f6 391\r
8dfb9fd5 392 Reset940(1, 2);\r
720ee7f6 393 Pause940(1);\r
394\r
49fe50f0 395 gp2x_memregs[0x3B40>>1] = 0; // disable DUALCPU interrupts for 920\r
396 gp2x_memregs[0x3B42>>1] = 1; // enable DUALCPU interrupts for 940\r
720ee7f6 397\r
edbb82f8 398 gp2x_memregl[0x4504>>2] = 0; // make sure no FIQs will be generated\r
399 gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r
400\r
401\r
720ee7f6 402 if (crashed_940)\r
403 {\r
404 unsigned char ucData[1024];\r
405 int nRead, i, nLen = 0;\r
406 char binpath[1024];\r
407 FILE *fp;\r
408\r
409 strncpy(binpath, g_argv[0], 1023);\r
410 binpath[1023] = 0;\r
411 for (i = strlen(binpath); i > 0; i--)\r
412 if (binpath[i] == '/') { binpath[i] = 0; break; }\r
95151aea 413 strcat(binpath, "/" CODE940_FILE);\r
720ee7f6 414\r
415 fp = fopen(binpath, "rb");\r
416 if(!fp)\r
417 {\r
13059a60 418 memset(gp2x_screen, 0, 320*240*2);\r
419 text_out16(10, 100, "failed to open required file:");\r
420 text_out16(10, 110, CODE940_FILE);\r
421 gp2x_video_flip2();\r
720ee7f6 422 printf("failed to open %s\n", binpath);\r
423 exit(1);\r
424 }\r
425\r
426 while(1)\r
427 {\r
428 nRead = fread(ucData, 1, 1024, fp);\r
429 if(nRead <= 0)\r
430 break;\r
431 memcpy(shared_mem + nLen, ucData, nRead);\r
432 nLen += nRead;\r
433 }\r
434 fclose(fp);\r
435 crashed_940 = 0;\r
436 }\r
437\r
438 memset(shared_data, 0, sizeof(*shared_data));\r
439 memset(shared_ctl, 0, sizeof(*shared_ctl));\r
440\r
441 REGS = YM2612GetRegs();\r
442\r
443 ym2612_dacen = &dacen;\r
444 ym2612_dacout = &dacout;\r
445\r
446 internal_reset();\r
447\r
979ba09f 448 loaded_mp3 = 0;\r
449\r
49fe50f0 450 gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r
edbb82f8 451 gp2x_memregl[0x4500>>2] = 0xffffffff; // clear pending IRQs in SRCPND\r
452 gp2x_memregl[0x4510>>2] = 0xffffffff; // clear pending IRQs in INTPND\r
720ee7f6 453\r
454 /* start the 940 */\r
8dfb9fd5 455 Reset940(0, 2);\r
720ee7f6 456 Pause940(0);\r
457\r
458 // YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\r
edbb82f8 459\r
460 /* now cause 940 to init it's ym2612 stuff */\r
461 shared_ctl->baseclock = baseclock;\r
462 shared_ctl->rate = rate;\r
463 add_job_940(JOB940_INITALL);\r
720ee7f6 464}\r
465\r
466\r
467void YM2612ResetChip_940(void)\r
468{\r
469 printf("YM2612ResetChip_940()\n");\r
470 if (shared_data == NULL) {\r
471 printf("YM2612ResetChip_940: reset before init?\n");\r
472 return;\r
473 }\r
474\r
720ee7f6 475 internal_reset();\r
476\r
edbb82f8 477 add_job_940(JOB940_YM2612RESETCHIP);\r
720ee7f6 478}\r
479\r
480\r
edbb82f8 481int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)\r
598e7c06 482{\r
edbb82f8 483 int *ym_buf = shared_data->ym_buffer;\r
4dfd9f42 484 int ym_active_chs;\r
49fe50f0 485\r
edbb82f8 486 //printf("YM2612UpdateOne_940()\n");\r
487\r
488 if (CHECK_BUSY(JOB940_YM2612UPDATEONE)) wait_busy_940(JOB940_YM2612UPDATEONE);\r
489\r
4dfd9f42 490 ym_active_chs = shared_ctl->ym_active_chs;\r
edbb82f8 491\r
4dfd9f42 492 // mix in ym buffer. is_buf_empty means nobody mixed there anything yet and it may contain trash\r
493 if (is_buf_empty && ym_active_chs) memcpy32(buffer, ym_buf, length<<stereo);\r
494 else memset32(buffer, 0, length<<stereo);\r
edbb82f8 495\r
496 if (shared_ctl->writebuffsel == 1) {\r
79cad122 497 shared_ctl->writebuff0[writebuff_ptr & 0xffff] = 0xffff;\r
49fe50f0 498 } else {\r
79cad122 499 shared_ctl->writebuff1[writebuff_ptr & 0xffff] = 0xffff;\r
598e7c06 500 }\r
edbb82f8 501 writebuff_ptr = 0;\r
502\r
503 /* predict sample counter for next frame */\r
504 if (PsndLen_exc_add) {\r
505 if (PsndLen_exc_cnt + PsndLen_exc_add >= 0x10000) length = PsndLen + 1;\r
506 else length = PsndLen;\r
507 }\r
508\r
509 /* give 940 ym job */\r
510 shared_ctl->writebuffsel ^= 1;\r
511 shared_ctl->length = length;\r
512 shared_ctl->stereo = stereo;\r
513\r
514 add_job_940(JOB940_YM2612UPDATEONE);\r
515\r
4dfd9f42 516 return ym_active_chs;\r
598e7c06 517}\r
598e7c06 518\r
598e7c06 519\r
979ba09f 520static int mp3_samples_ready = 0, mp3_buffer_offs = 0;\r
edbb82f8 521static int mp3_play_bufsel = 0, mp3_job_started = 0;\r
598e7c06 522\r
edbb82f8 523void mp3_update(int *buffer, int length, int stereo)\r
720ee7f6 524{\r
edbb82f8 525 int length_mp3;\r
526 int cdda_on;\r
49fe50f0 527\r
edbb82f8 528 // not data track, CDC is reading, playback was started, track not ended\r
529 cdda_on = !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1) &&\r
530 loaded_mp3 && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r
720ee7f6 531\r
edbb82f8 532 if (!cdda_on) return;\r
720ee7f6 533\r
edbb82f8 534 if (!(PicoOpt&0x200)) {\r
535 mp3_update_local(buffer, length, stereo);\r
536 return;\r
537 }\r
720ee7f6 538\r
edbb82f8 539 length_mp3 = length;\r
540 if (PsndRate == 22050) length_mp3 <<= 1; // mp3s are locked to 44100Hz stereo\r
541 else if (PsndRate == 11025) length_mp3 <<= 2; // so make length 44100ish\r
49fe50f0 542\r
edbb82f8 543 /* do we have to wait? */\r
544 if (mp3_job_started && mp3_samples_ready < length_mp3) {\r
545 if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
546 mp3_job_started = 0;\r
547 mp3_samples_ready += 1152;\r
548 }\r
598e7c06 549\r
49fe50f0 550 /* mix mp3 data, only stereo */\r
edbb82f8 551 if (mp3_samples_ready >= length_mp3)\r
598e7c06 552 {\r
49fe50f0 553 int shr = 0;\r
554 void (*mix_samples)(int *dest_buf, short *mp3_buf, int count) = mix_16h_to_32;\r
555 if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }\r
556 else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }\r
598e7c06 557\r
49fe50f0 558 if (1152 - mp3_buffer_offs >= length_mp3) {\r
edbb82f8 559 mix_samples(buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);\r
49fe50f0 560\r
561 mp3_buffer_offs += length_mp3;\r
598e7c06 562 } else {\r
edbb82f8 563 // collect samples from both buffers..\r
598e7c06 564 int left = 1152 - mp3_buffer_offs;\r
49fe50f0 565 if (mp3_play_bufsel == 0)\r
566 {\r
edbb82f8 567 mix_samples(buffer, shared_data->mp3_buffer[0] + mp3_buffer_offs*2, length<<1);\r
49fe50f0 568 mp3_buffer_offs = length_mp3 - left;\r
569 mp3_play_bufsel = 1;\r
570 } else {\r
571 mix_samples(buffer, shared_data->mp3_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);\r
572 mp3_buffer_offs = length_mp3 - left;\r
573 mix_samples(buffer + ((left>>shr)<<1),\r
574 shared_data->mp3_buffer[0], (mp3_buffer_offs>>shr)<<1);\r
575 mp3_play_bufsel = 0;\r
576 }\r
720ee7f6 577 }\r
49fe50f0 578 mp3_samples_ready -= length_mp3;\r
720ee7f6 579 }\r
580\r
edbb82f8 581 // ask to decode more if we already can\r
582 if (!mp3_job_started)\r
598e7c06 583 {\r
edbb82f8 584 mp3_job_started = 1;\r
598e7c06 585 shared_ctl->mp3_buffsel ^= 1;\r
edbb82f8 586 add_job_940(JOB940_MP3DECODE);\r
598e7c06 587 }\r
720ee7f6 588}\r
598e7c06 589\r
590\r
591/***********************************************************/\r
592\r
593void mp3_start_play(FILE *f, int pos) // pos is 0-1023\r
594{\r
595 int byte_offs = 0;\r
596\r
7bc9cd7f 597 if (!(PicoOpt&0x800)) { // cdda disabled?\r
598e7c06 598 return;\r
599 }\r
600\r
601 if (loaded_mp3 != f)\r
602 {\r
dfa4c846 603 if (PicoMessage != NULL)\r
604 {\r
605 fseek(f, 0, SEEK_END);\r
606 if (ftell(f) > 2*1024*1024)\r
607 PicoMessage("Loading MP3...");\r
608 }\r
598e7c06 609 fseek(f, 0, SEEK_SET);\r
610 fread(mp3_mem, 1, MP3_SIZE_MAX, f);\r
60b4b403 611 if (!feof(f)) printf("Warning: mp3 was too large, not all data loaded.\n");\r
598e7c06 612 shared_ctl->mp3_len = ftell(f);\r
613 loaded_mp3 = f;\r
edbb82f8 614\r
615 if (PicoOpt&0x200) {\r
616 // as we are going to change 940's cacheable area, we must invalidate it's cache..\r
617 if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
618 add_job_940(JOB940_INVALIDATE_DCACHE);\r
619 }\r
8f1b51ef 620 reset_timing = 1;\r
598e7c06 621 }\r
622\r
623 // seek..\r
624 if (pos) {\r
625 byte_offs = (shared_ctl->mp3_len << 6) >> 10;\r
626 byte_offs *= pos;\r
627 byte_offs >>= 6;\r
628 }\r
49fe50f0 629 // printf("mp3 pos1024: %i, byte_offs %i/%i\n", pos, byte_offs, shared_ctl->mp3_len);\r
598e7c06 630\r
631 shared_ctl->mp3_offs = byte_offs;\r
979ba09f 632\r
edbb82f8 633 // reset buffer pointers and stuff..\r
979ba09f 634 mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;\r
edbb82f8 635 mp3_job_started = 0;\r
979ba09f 636 shared_ctl->mp3_buffsel = 1; // will change to 0 on first decode\r
edbb82f8 637\r
638 if (!(PicoOpt&0x200)) mp3_start_local();\r
598e7c06 639}\r
640\r
641\r
98c9d8d9 642int mp3_get_offset(void)\r
643{\r
644 int offs1024 = 0;\r
645 int cdda_on;\r
646\r
7bc9cd7f 647 cdda_on = (PicoMCD & 1) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r
edbb82f8 648 (Pico_mcd->scd.Status_CDC & 1) && loaded_mp3;\r
98c9d8d9 649\r
650 if (cdda_on) {\r
651 offs1024 = shared_ctl->mp3_offs << 7;\r
652 offs1024 /= shared_ctl->mp3_len;\r
653 offs1024 <<= 3;\r
654 }\r
655 printf("offs1024=%i (%i/%i)\n", offs1024, shared_ctl->mp3_offs, shared_ctl->mp3_len);\r
656\r
657 return offs1024;\r
658}\r
659\r
660\r
PicoDrive's frontend in a lib