720ee7f6 |
1 | #include <stdio.h>\r |
2 | #include <stdlib.h>\r |
3 | #include <string.h>\r |
4 | #include <unistd.h>\r |
5 | #include <sys/mman.h>\r |
6 | #include <sys/ioctl.h>\r |
7 | #include <fcntl.h>\r |
8 | #include <errno.h>\r |
9 | \r |
b30a8e67 |
10 | #include "code940/940shared.h"\r |
720ee7f6 |
11 | #include "gp2x.h"\r |
12 | #include "emu.h"\r |
13 | #include "menu.h"\r |
14 | #include "asmutils.h"\r |
598e7c06 |
15 | #include "../../Pico/PicoInt.h"\r |
720ee7f6 |
16 | \r |
17 | /* we will need some gp2x internals here */\r |
18 | extern volatile unsigned short *gp2x_memregs; /* from minimal library rlyeh */\r |
19 | extern volatile unsigned long *gp2x_memregl;\r |
20 | \r |
21 | static unsigned char *shared_mem = 0;\r |
22 | static _940_data_t *shared_data = 0;\r |
23 | static _940_ctl_t *shared_ctl = 0;\r |
598e7c06 |
24 | static unsigned char *mp3_mem = 0;\r |
25 | \r |
26 | #define MP3_SIZE_MAX (0x1000000 - 4*640*480)\r |
720ee7f6 |
27 | \r |
28 | int crashed_940 = 0;\r |
29 | \r |
30 | \r |
31 | /***********************************************************/\r |
32 | \r |
33 | #define MAXOUT (+32767)\r |
34 | #define MINOUT (-32768)\r |
35 | \r |
36 | /* limitter */\r |
37 | #define Limit(val, max,min) { \\r |
38 | if ( val > max ) val = max; \\r |
39 | else if ( val < min ) val = min; \\r |
40 | }\r |
41 | \r |
42 | /* these will be managed locally on our side */\r |
43 | extern int *ym2612_dacen;\r |
44 | extern INT32 *ym2612_dacout;\r |
45 | extern void *ym2612_regs;\r |
46 | \r |
47 | static UINT8 *REGS = 0; /* we will also keep local copy of regs for savestates and such */\r |
48 | static INT32 addr_A1; /* address line A1 */\r |
49 | static int dacen;\r |
50 | static INT32 dacout;\r |
51 | static UINT8 ST_address; /* address register */\r |
52 | static UINT8 ST_status; /* status flag */\r |
53 | static UINT8 ST_mode; /* mode CSM / 3SLOT */\r |
54 | static int ST_TA; /* timer a */\r |
55 | static int ST_TAC; /* timer a maxval */\r |
56 | static int ST_TAT; /* timer a ticker */\r |
57 | static UINT8 ST_TB; /* timer b */\r |
58 | static int ST_TBC; /* timer b maxval */\r |
59 | static int ST_TBT; /* timer b ticker */\r |
60 | \r |
61 | static int writebuff_ptr = 0;\r |
62 | \r |
63 | \r |
64 | /* OPN Mode Register Write */\r |
65 | static void set_timers( int v )\r |
66 | {\r |
67 | /* b7 = CSM MODE */\r |
68 | /* b6 = 3 slot mode */\r |
69 | /* b5 = reset b */\r |
70 | /* b4 = reset a */\r |
71 | /* b3 = timer enable b */\r |
72 | /* b2 = timer enable a */\r |
73 | /* b1 = load b */\r |
74 | /* b0 = load a */\r |
75 | ST_mode = v;\r |
76 | \r |
77 | /* reset Timer b flag */\r |
78 | if( v & 0x20 )\r |
79 | ST_status &= ~2;\r |
80 | \r |
81 | /* reset Timer a flag */\r |
82 | if( v & 0x10 )\r |
83 | ST_status &= ~1;\r |
84 | }\r |
85 | \r |
86 | /* YM2612 write */\r |
87 | /* a = address */\r |
88 | /* v = value */\r |
89 | /* returns 1 if sample affecting state changed */\r |
90 | int YM2612Write_940(unsigned int a, unsigned int v)\r |
91 | {\r |
92 | int addr; //, ret=1;\r |
93 | \r |
94 | v &= 0xff; /* adjust to 8 bit bus */\r |
95 | a &= 3;\r |
96 | \r |
97 | switch( a ) {\r |
98 | case 0: /* address port 0 */\r |
99 | ST_address = v;\r |
100 | addr_A1 = 0;\r |
101 | //ret=0;\r |
102 | break;\r |
103 | \r |
104 | case 1: /* data port 0 */\r |
105 | if (addr_A1 != 0) {\r |
106 | return 0; /* verified on real YM2608 */\r |
107 | }\r |
108 | \r |
109 | addr = ST_address;\r |
110 | REGS[addr] = v;\r |
111 | \r |
112 | switch( addr & 0xf0 )\r |
113 | {\r |
114 | case 0x20: /* 0x20-0x2f Mode */\r |
115 | switch( addr )\r |
116 | {\r |
117 | case 0x24: { // timer A High 8\r |
118 | int TAnew = (ST_TA & 0x03)|(((int)v)<<2);\r |
119 | if(ST_TA != TAnew) {\r |
120 | // we should reset ticker only if new value is written. Outrun requires this.\r |
121 | ST_TA = TAnew;\r |
122 | ST_TAC = (1024-TAnew)*18;\r |
123 | ST_TAT = 0;\r |
124 | }\r |
125 | return 0;\r |
126 | }\r |
127 | case 0x25: { // timer A Low 2\r |
128 | int TAnew = (ST_TA & 0x3fc)|(v&3);\r |
129 | if(ST_TA != TAnew) {\r |
130 | ST_TA = TAnew;\r |
131 | ST_TAC = (1024-TAnew)*18;\r |
132 | ST_TAT = 0;\r |
133 | }\r |
134 | return 0;\r |
135 | }\r |
136 | case 0x26: // timer B\r |
137 | if(ST_TB != v) {\r |
138 | ST_TB = v;\r |
139 | ST_TBC = (256-v)<<4;\r |
140 | ST_TBC *= 18;\r |
141 | ST_TBT = 0;\r |
142 | }\r |
143 | return 0;\r |
144 | case 0x27: /* mode, timer control */\r |
145 | set_timers( v );\r |
146 | break; // other side needs ST.mode for 3slot mode\r |
147 | case 0x2a: /* DAC data (YM2612) */\r |
148 | dacout = ((int)v - 0x80) << 6; /* level unknown (notaz: 8 seems to be too much) */\r |
149 | return 0;\r |
150 | case 0x2b: /* DAC Sel (YM2612) */\r |
151 | /* b7 = dac enable */\r |
152 | dacen = v & 0x80;\r |
153 | break; // other side has to know this\r |
154 | default:\r |
155 | break;\r |
156 | }\r |
157 | break;\r |
158 | }\r |
159 | break;\r |
160 | \r |
161 | case 2: /* address port 1 */\r |
162 | ST_address = v;\r |
163 | addr_A1 = 1;\r |
164 | //ret=0;\r |
165 | break;\r |
166 | \r |
167 | case 3: /* data port 1 */\r |
168 | if (addr_A1 != 1) {\r |
169 | return 0; /* verified on real YM2608 */\r |
170 | }\r |
171 | \r |
172 | addr = ST_address | 0x100;\r |
173 | REGS[addr] = v;\r |
174 | break;\r |
175 | }\r |
176 | \r |
177 | if(currentConfig.EmuOpt & 4) {\r |
178 | /* queue this write for 940 */\r |
179 | if (writebuff_ptr < 2047) {\r |
180 | if (shared_ctl->writebuffsel == 1) {\r |
181 | shared_ctl->writebuff0[writebuff_ptr++] = (a<<8)|v;\r |
182 | } else {\r |
183 | shared_ctl->writebuff1[writebuff_ptr++] = (a<<8)|v;\r |
184 | }\r |
185 | } else {\r |
186 | printf("warning: writebuff_ptr > 2047\n");\r |
187 | }\r |
188 | }\r |
189 | \r |
190 | return 0; // cause the engine to do updates once per frame only\r |
191 | }\r |
192 | \r |
193 | UINT8 YM2612Read_940(void)\r |
194 | {\r |
195 | return ST_status;\r |
196 | }\r |
197 | \r |
198 | \r |
199 | int YM2612PicoTick_940(int n)\r |
200 | {\r |
201 | //int ret = 0;\r |
202 | \r |
203 | // timer A\r |
204 | if(ST_mode & 0x01 && (ST_TAT+=64*n) >= ST_TAC) {\r |
205 | ST_TAT -= ST_TAC;\r |
206 | if(ST_mode & 0x04) ST_status |= 1;\r |
207 | // CSM mode total level latch and auto key on\r |
208 | /* FIXME\r |
209 | if(ST_mode & 0x80) {\r |
210 | CSMKeyControll( &(ym2612_940->CH[2]) ); // Vectorman2, etc.\r |
211 | ret = 1;\r |
212 | }\r |
213 | */\r |
214 | }\r |
215 | \r |
216 | // timer B\r |
217 | if(ST_mode & 0x02 && (ST_TBT+=64*n) >= ST_TBC) {\r |
218 | ST_TBT -= ST_TBC;\r |
219 | if(ST_mode & 0x08) ST_status |= 2;\r |
220 | }\r |
221 | \r |
222 | return 0;\r |
223 | }\r |
224 | \r |
225 | \r |
226 | static void wait_busy_940(void)\r |
227 | {\r |
228 | int i;\r |
229 | #if 0\r |
230 | printf("940 busy, entering wait loop.. (cnt: %i, wc: %i, ve: ", shared_ctl->loopc, shared_ctl->waitc);\r |
231 | for (i = 0; i < 8; i++)\r |
232 | printf("%i ", shared_ctl->vstarts[i]);\r |
233 | printf(")\n");\r |
234 | \r |
235 | for (i = 0; shared_ctl->busy; i++)\r |
236 | {\r |
237 | spend_cycles(1024); /* needs tuning */\r |
238 | }\r |
239 | printf("wait iterations: %i\n", i);\r |
240 | #else\r |
241 | for (i = 0; shared_ctl->busy && i < 0x10000; i++)\r |
b30a8e67 |
242 | spend_cycles(8*1024); // tested to be best for mp3 dec\r |
720ee7f6 |
243 | if (i < 0x10000) return;\r |
244 | \r |
245 | /* 940 crashed */\r |
b30a8e67 |
246 | printf("940 crashed (cnt: %i, ve: ", shared_ctl->loopc);\r |
720ee7f6 |
247 | for (i = 0; i < 8; i++)\r |
248 | printf("%i ", shared_ctl->vstarts[i]);\r |
249 | printf(")\n");\r |
250 | strcpy(menuErrorMsg, "940 crashed.");\r |
251 | engineState = PGS_Menu;\r |
252 | crashed_940 = 1;\r |
253 | #endif\r |
254 | }\r |
255 | \r |
256 | \r |
8dfb9fd5 |
257 | static void add_job_940(int job0, int job1)\r |
720ee7f6 |
258 | {\r |
8dfb9fd5 |
259 | shared_ctl->jobs[0] = job0;\r |
260 | shared_ctl->jobs[1] = job1;\r |
720ee7f6 |
261 | shared_ctl->busy = 1;\r |
262 | gp2x_memregs[0x3B3E>>1] = 0xffff; // cause an IRQ for 940\r |
263 | }\r |
264 | \r |
265 | \r |
266 | void YM2612PicoStateLoad_940(void)\r |
267 | {\r |
268 | int i, old_A1 = addr_A1;\r |
269 | \r |
270 | if (shared_ctl->busy) wait_busy_940();\r |
271 | \r |
272 | // feed all the registers and update internal state\r |
273 | for(i = 0; i < 0x100; i++) {\r |
274 | YM2612Write_940(0, i);\r |
275 | YM2612Write_940(1, REGS[i]);\r |
276 | }\r |
277 | for(i = 0; i < 0x100; i++) {\r |
278 | YM2612Write_940(2, i);\r |
279 | YM2612Write_940(3, REGS[i|0x100]);\r |
280 | }\r |
281 | \r |
282 | addr_A1 = old_A1;\r |
283 | \r |
8dfb9fd5 |
284 | add_job_940(JOB940_PICOSTATELOAD, 0);\r |
720ee7f6 |
285 | }\r |
286 | \r |
287 | \r |
288 | static void internal_reset(void)\r |
289 | {\r |
290 | writebuff_ptr = 0;\r |
291 | ST_mode = 0;\r |
292 | ST_status = 0; /* normal mode */\r |
293 | ST_TA = 0;\r |
294 | ST_TAC = 0;\r |
295 | ST_TB = 0;\r |
296 | ST_TBC = 0;\r |
297 | dacen = 0;\r |
298 | }\r |
299 | \r |
300 | \r |
301 | extern char **g_argv;\r |
302 | \r |
303 | /* none of the functions in this file should be called before this one */\r |
304 | void YM2612Init_940(int baseclock, int rate)\r |
305 | {\r |
306 | printf("YM2612Init_940()\n");\r |
8dfb9fd5 |
307 | printf("Mem usage: shared_data: %i, shared_ctl: %i\n", sizeof(*shared_data), sizeof(*shared_ctl));\r |
720ee7f6 |
308 | \r |
8dfb9fd5 |
309 | Reset940(1, 2);\r |
720ee7f6 |
310 | Pause940(1);\r |
311 | \r |
312 | gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r |
313 | gp2x_memregs[0x3B42>>1] = 0xffff; // enable DUALCPU interrupts for 940\r |
314 | \r |
315 | gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r |
316 | \r |
317 | if (shared_mem == NULL)\r |
318 | {\r |
8dfb9fd5 |
319 | shared_mem = (unsigned char *) mmap(0, 0x210000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2000000);\r |
720ee7f6 |
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 |
598e7c06 |
328 | mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x3000000);\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 |
720ee7f6 |
334 | crashed_940 = 1;\r |
335 | }\r |
336 | \r |
337 | if (crashed_940)\r |
338 | {\r |
339 | unsigned char ucData[1024];\r |
340 | int nRead, i, nLen = 0;\r |
341 | char binpath[1024];\r |
342 | FILE *fp;\r |
343 | \r |
344 | strncpy(binpath, g_argv[0], 1023);\r |
345 | binpath[1023] = 0;\r |
346 | for (i = strlen(binpath); i > 0; i--)\r |
347 | if (binpath[i] == '/') { binpath[i] = 0; break; }\r |
348 | strcat(binpath, "/code940.bin");\r |
349 | \r |
350 | fp = fopen(binpath, "rb");\r |
351 | if(!fp)\r |
352 | {\r |
353 | memset(gp2x_screen, 0, 320*240);\r |
354 | gp2x_text_out8(10, 100, "failed to open required file:");\r |
355 | gp2x_text_out8(10, 110, "code940.bin");\r |
356 | gp2x_video_flip();\r |
357 | printf("failed to open %s\n", binpath);\r |
358 | exit(1);\r |
359 | }\r |
360 | \r |
361 | while(1)\r |
362 | {\r |
363 | nRead = fread(ucData, 1, 1024, fp);\r |
364 | if(nRead <= 0)\r |
365 | break;\r |
366 | memcpy(shared_mem + nLen, ucData, nRead);\r |
367 | nLen += nRead;\r |
368 | }\r |
369 | fclose(fp);\r |
370 | crashed_940 = 0;\r |
371 | }\r |
372 | \r |
373 | memset(shared_data, 0, sizeof(*shared_data));\r |
374 | memset(shared_ctl, 0, sizeof(*shared_ctl));\r |
375 | \r |
376 | REGS = YM2612GetRegs();\r |
377 | \r |
378 | ym2612_dacen = &dacen;\r |
379 | ym2612_dacout = &dacout;\r |
380 | \r |
381 | internal_reset();\r |
382 | \r |
383 | /* now cause 940 to init it's ym2612 stuff */\r |
384 | shared_ctl->baseclock = baseclock;\r |
385 | shared_ctl->rate = rate;\r |
b30a8e67 |
386 | shared_ctl->jobs[0] = JOB940_INITALL;\r |
8dfb9fd5 |
387 | shared_ctl->jobs[1] = 0;\r |
720ee7f6 |
388 | shared_ctl->busy = 1;\r |
389 | \r |
390 | /* start the 940 */\r |
8dfb9fd5 |
391 | Reset940(0, 2);\r |
720ee7f6 |
392 | Pause940(0);\r |
393 | \r |
394 | // YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\r |
395 | }\r |
396 | \r |
397 | \r |
398 | void YM2612ResetChip_940(void)\r |
399 | {\r |
400 | printf("YM2612ResetChip_940()\n");\r |
401 | if (shared_data == NULL) {\r |
402 | printf("YM2612ResetChip_940: reset before init?\n");\r |
403 | return;\r |
404 | }\r |
405 | \r |
406 | if (shared_ctl->busy) wait_busy_940();\r |
407 | \r |
408 | internal_reset();\r |
409 | \r |
8dfb9fd5 |
410 | add_job_940(JOB940_YM2612RESETCHIP, 0);\r |
720ee7f6 |
411 | }\r |
412 | \r |
413 | \r |
598e7c06 |
414 | static void mix_samples(short *dest_buf, int *ym_buf, short *mp3_buf, int len, int stereo)\r |
415 | {\r |
416 | if (mp3_buf)\r |
417 | {\r |
418 | if (stereo)\r |
419 | {\r |
420 | for (; len > 0; len--)\r |
421 | {\r |
422 | int l, r, lm, rm;\r |
423 | l = r = *dest_buf;\r |
424 | l += *ym_buf++; r += *ym_buf++;\r |
425 | lm = *mp3_buf++; rm = *mp3_buf++;\r |
426 | l += lm - lm/2; r += rm - rm/2;\r |
427 | Limit( l, MAXOUT, MINOUT );\r |
428 | Limit( r, MAXOUT, MINOUT );\r |
429 | *dest_buf++ = l; *dest_buf++ = r;\r |
430 | }\r |
431 | } else {\r |
432 | for (; len > 0; len--)\r |
433 | {\r |
434 | // TODO: normalize\r |
435 | int l = *ym_buf++;\r |
436 | l += *dest_buf;\r |
437 | l += *mp3_buf++;\r |
438 | Limit( l, MAXOUT, MINOUT );\r |
439 | *dest_buf++ = l;\r |
440 | }\r |
441 | }\r |
442 | }\r |
443 | else\r |
444 | {\r |
445 | if (stereo)\r |
446 | {\r |
447 | for (; len > 0; len--)\r |
448 | {\r |
449 | int l, r;\r |
450 | l = r = *dest_buf;\r |
451 | l += *ym_buf++, r += *ym_buf++;\r |
452 | Limit( l, MAXOUT, MINOUT );\r |
453 | Limit( r, MAXOUT, MINOUT );\r |
454 | *dest_buf++ = l; *dest_buf++ = r;\r |
455 | }\r |
456 | } else {\r |
457 | for (; len > 0; len--)\r |
458 | {\r |
459 | int l = *ym_buf++;\r |
460 | l += *dest_buf;\r |
461 | Limit( l, MAXOUT, MINOUT );\r |
462 | *dest_buf++ = l;\r |
463 | }\r |
464 | }\r |
465 | }\r |
466 | }\r |
467 | \r |
468 | \r |
469 | // here we assume that length is different between games, but constant in one game\r |
470 | \r |
471 | static FILE *loaded_mp3 = 0;\r |
472 | \r |
720ee7f6 |
473 | void YM2612UpdateOne_940(short *buffer, int length, int stereo)\r |
474 | {\r |
598e7c06 |
475 | int cdda_on, *ym_buffer = shared_data->mix_buffer, mp3_job = 0;\r |
476 | static int mp3_samples_ready = 0, mp3_buffer_offs = 0;\r |
477 | static int mp3_play_bufsel = 1;\r |
720ee7f6 |
478 | \r |
479 | //printf("YM2612UpdateOne_940()\n");\r |
480 | if (shared_ctl->busy) wait_busy_940();\r |
481 | \r |
482 | //printf("940 (cnt: %i, wc: %i, ve: ", shared_ctl->loopc, shared_ctl->waitc);\r |
483 | //for (i = 0; i < 8; i++)\r |
484 | // printf("%i ", shared_ctl->vstarts[i]);\r |
485 | //printf(")\n");\r |
486 | \r |
598e7c06 |
487 | // emulatind MCD, cdda enabled in config, not data track, CDC is reading, playback was started, track not ended\r |
488 | cdda_on = (PicoMCD & 1) && (currentConfig.EmuOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r |
489 | (Pico_mcd->scd.Status_CDC & 1) && loaded_mp3 && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r |
490 | \r |
720ee7f6 |
491 | /* mix data from previous go */\r |
598e7c06 |
492 | if (cdda_on && mp3_samples_ready >= length)\r |
493 | {\r |
494 | if (1152 - mp3_buffer_offs >= length) {\r |
495 | mix_samples(buffer, ym_buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length, stereo);\r |
496 | \r |
497 | mp3_buffer_offs += length;\r |
498 | } else {\r |
499 | // collect from both buffers..\r |
500 | int left = 1152 - mp3_buffer_offs;\r |
501 | mix_samples(buffer, ym_buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, left, stereo);\r |
502 | mp3_play_bufsel ^= 1;\r |
503 | mp3_buffer_offs = length - left;\r |
504 | mix_samples(buffer + left * 2, ym_buffer + left * 2,\r |
505 | shared_data->mp3_buffer[mp3_play_bufsel], mp3_buffer_offs, stereo);\r |
720ee7f6 |
506 | }\r |
598e7c06 |
507 | mp3_samples_ready -= length;\r |
720ee7f6 |
508 | } else {\r |
598e7c06 |
509 | mix_samples(buffer, ym_buffer, 0, length, stereo);\r |
720ee7f6 |
510 | }\r |
511 | \r |
512 | //printf("new writes: %i\n", writebuff_ptr);\r |
513 | if (shared_ctl->writebuffsel == 1) {\r |
514 | shared_ctl->writebuff0[writebuff_ptr] = 0xffff;\r |
515 | } else {\r |
516 | shared_ctl->writebuff1[writebuff_ptr] = 0xffff;\r |
517 | }\r |
518 | writebuff_ptr = 0;\r |
519 | \r |
598e7c06 |
520 | /* give 940 ym job */\r |
720ee7f6 |
521 | shared_ctl->writebuffsel ^= 1;\r |
522 | shared_ctl->length = length;\r |
523 | shared_ctl->stereo = stereo;\r |
598e7c06 |
524 | \r |
525 | // make sure we will have enough mp3 samples next frame\r |
526 | if (cdda_on && mp3_samples_ready < length)\r |
527 | {\r |
528 | shared_ctl->mp3_buffsel ^= 1;\r |
529 | mp3_job = JOB940_MP3DECODE;\r |
530 | mp3_samples_ready += 1152;\r |
531 | }\r |
532 | \r |
533 | add_job_940(JOB940_YM2612UPDATEONE, mp3_job);\r |
720ee7f6 |
534 | //spend_cycles(512);\r |
535 | //printf("SRCPND: %08lx, INTMODE: %08lx, INTMASK: %08lx, INTPEND: %08lx\n",\r |
536 | // gp2x_memregl[0x4500>>2], gp2x_memregl[0x4504>>2], gp2x_memregl[0x4508>>2], gp2x_memregl[0x4510>>2]);\r |
537 | }\r |
598e7c06 |
538 | \r |
539 | \r |
540 | /***********************************************************/\r |
541 | \r |
542 | void mp3_start_play(FILE *f, int pos) // pos is 0-1023\r |
543 | {\r |
544 | int byte_offs = 0;\r |
545 | \r |
546 | if (!(currentConfig.EmuOpt&0x800)) { // cdda disabled?\r |
547 | return;\r |
548 | }\r |
549 | \r |
550 | if (loaded_mp3 != f)\r |
551 | {\r |
552 | printf("loading mp3... "); fflush(stdout);\r |
553 | fseek(f, 0, SEEK_SET);\r |
554 | fread(mp3_mem, 1, MP3_SIZE_MAX, f);\r |
555 | if (feof(f)) printf("done.\n");\r |
556 | else printf("done. mp3 too large, not all data loaded.\n");\r |
557 | shared_ctl->mp3_len = ftell(f);\r |
558 | loaded_mp3 = f;\r |
559 | }\r |
560 | \r |
561 | // seek..\r |
562 | if (pos) {\r |
563 | byte_offs = (shared_ctl->mp3_len << 6) >> 10;\r |
564 | byte_offs *= pos;\r |
565 | byte_offs >>= 6;\r |
566 | }\r |
567 | printf("mp3 pos1024: %i, byte_offs %i/%i\n", pos, byte_offs, shared_ctl->mp3_len);\r |
568 | \r |
569 | shared_ctl->mp3_offs = byte_offs;\r |
570 | }\r |
571 | \r |
572 | \r |