| 1 | #include "940shared.h"\r |
| 2 | \r |
| 3 | static _940_data_t *shared_data = (_940_data_t *) 0x00100000;\r |
| 4 | static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;\r |
| 5 | static unsigned char *mp3_data = (unsigned char *) 0x01000000;\r |
| 6 | YM2612 *ym2612_940;\r |
| 7 | int *mix_buffer;\r |
| 8 | \r |
| 9 | // from init.s\r |
| 10 | void wait_irq(void);\r |
| 11 | void spend_cycles(int c);\r |
| 12 | void cache_clean(void);\r |
| 13 | void cache_clean_flush(void);\r |
| 14 | // this should help to resolve race confition where shared var\r |
| 15 | // is changed by other core just before we update it\r |
| 16 | void set_if_not_changed(int *val, int oldval, int newval);\r |
| 17 | \r |
| 18 | // asm volatile ("mov r0, #0" ::: "r0");\r |
| 19 | // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */\r |
| 20 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */\r |
| 21 | \r |
| 22 | \r |
| 23 | static void mp3_decode(void)\r |
| 24 | {\r |
| 25 | int mp3_offs = shared_ctl->mp3_offs;\r |
| 26 | unsigned char *readPtr = mp3_data + mp3_offs;\r |
| 27 | int bytesLeft = shared_ctl->mp3_len - mp3_offs;\r |
| 28 | int offset; // frame offset from readPtr\r |
| 29 | int err;\r |
| 30 | \r |
| 31 | if (bytesLeft <= 0) return; // EOF, nothing to do\r |
| 32 | \r |
| 33 | offset = MP3FindSyncWord(readPtr, bytesLeft);\r |
| 34 | if (offset < 0) {\r |
| 35 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r |
| 36 | return; // EOF\r |
| 37 | }\r |
| 38 | readPtr += offset;\r |
| 39 | bytesLeft -= offset;\r |
| 40 | \r |
| 41 | err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,\r |
| 42 | shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);\r |
| 43 | if (err) {\r |
| 44 | if (err == ERR_MP3_INDATA_UNDERFLOW) {\r |
| 45 | shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF\r |
| 46 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r |
| 47 | return;\r |
| 48 | } else if (err <= -6 && err >= -12) {\r |
| 49 | // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*\r |
| 50 | // just try to skip the offending frame..\r |
| 51 | readPtr++;\r |
| 52 | }\r |
| 53 | shared_ctl->mp3_errors++;\r |
| 54 | shared_ctl->mp3_lasterr = err;\r |
| 55 | }\r |
| 56 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);\r |
| 57 | }\r |
| 58 | \r |
| 59 | \r |
| 60 | void Main940(int startvector, int pc_at_irq)\r |
| 61 | {\r |
| 62 | ym2612_940 = &shared_data->ym2612;\r |
| 63 | mix_buffer = shared_data->mix_buffer;\r |
| 64 | \r |
| 65 | // debug\r |
| 66 | shared_ctl->vstarts[startvector]++;\r |
| 67 | shared_ctl->last_irq_pc = pc_at_irq;\r |
| 68 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");\r |
| 69 | \r |
| 70 | \r |
| 71 | // for (;;)\r |
| 72 | {\r |
| 73 | int job_num = 0;\r |
| 74 | /*\r |
| 75 | while (!shared_ctl->busy)\r |
| 76 | {\r |
| 77 | //shared_ctl->waitc++;\r |
| 78 | spend_cycles(8*1024);\r |
| 79 | }\r |
| 80 | */\r |
| 81 | /*\r |
| 82 | if (!shared_ctl->busy)\r |
| 83 | {\r |
| 84 | wait_irq();\r |
| 85 | }\r |
| 86 | shared_ctl->lastbusy = shared_ctl->busy;\r |
| 87 | */\r |
| 88 | \r |
| 89 | for (job_num = 0; job_num < MAX_940JOBS; job_num++)\r |
| 90 | {\r |
| 91 | shared_ctl->lastjob = (job_num << 8) | shared_ctl->jobs[job_num];\r |
| 92 | \r |
| 93 | switch (shared_ctl->jobs[job_num])\r |
| 94 | {\r |
| 95 | case JOB940_INITALL:\r |
| 96 | /* ym2612 */\r |
| 97 | shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r |
| 98 | YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r |
| 99 | /* Helix mp3 decoder */\r |
| 100 | shared_data->mp3dec = MP3InitDecoder();\r |
| 101 | break;\r |
| 102 | \r |
| 103 | case JOB940_YM2612RESETCHIP:\r |
| 104 | YM2612ResetChip_();\r |
| 105 | break;\r |
| 106 | \r |
| 107 | case JOB940_PICOSTATELOAD:\r |
| 108 | YM2612PicoStateLoad_();\r |
| 109 | break;\r |
| 110 | \r |
| 111 | case JOB940_YM2612UPDATEONE: {\r |
| 112 | int i, dw, *wbuff;\r |
| 113 | if (shared_ctl->writebuffsel == 1) {\r |
| 114 | wbuff = (int *) shared_ctl->writebuff1;\r |
| 115 | } else {\r |
| 116 | wbuff = (int *) shared_ctl->writebuff0;\r |
| 117 | }\r |
| 118 | \r |
| 119 | /* playback all writes */\r |
| 120 | for (i = 2048/2; i > 0; i--) {\r |
| 121 | UINT16 d;\r |
| 122 | dw = *wbuff++;\r |
| 123 | d = dw;\r |
| 124 | if (d == 0xffff) break;\r |
| 125 | YM2612Write_(d >> 8, d);\r |
| 126 | d = (dw>>16);\r |
| 127 | if (d == 0xffff) break;\r |
| 128 | YM2612Write_(d >> 8, d);\r |
| 129 | }\r |
| 130 | \r |
| 131 | YM2612UpdateOne_(mix_buffer, shared_ctl->length, shared_ctl->stereo, 1);\r |
| 132 | break;\r |
| 133 | }\r |
| 134 | \r |
| 135 | case JOB940_MP3DECODE:\r |
| 136 | mp3_decode();\r |
| 137 | break;\r |
| 138 | }\r |
| 139 | }\r |
| 140 | \r |
| 141 | cache_clean();\r |
| 142 | // asm volatile ("mov r0, #0" ::: "r0");\r |
| 143 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */\r |
| 144 | // cache_clean_flush();\r |
| 145 | \r |
| 146 | shared_ctl->loopc++;\r |
| 147 | \r |
| 148 | // // shared_ctl->busy = 0; // shared mem is not reliable?\r |
| 149 | \r |
| 150 | wait_irq();\r |
| 151 | }\r |
| 152 | }\r |
| 153 | \r |