| 1 | // The top-level functions for the ARM940\r |
| 2 | // (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r |
| 3 | \r |
| 4 | #include "940shared.h"\r |
| 5 | \r |
| 6 | static _940_data_t *shared_data = (_940_data_t *) 0x00100000;\r |
| 7 | static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;\r |
| 8 | static unsigned char *mp3_data = (unsigned char *) 0x00400000;\r |
| 9 | YM2612 *ym2612_940;\r |
| 10 | \r |
| 11 | // from init.s\r |
| 12 | int wait_get_job(int oldjob);\r |
| 13 | void spend_cycles(int c);\r |
| 14 | void dcache_clean(void);\r |
| 15 | void dcache_clean_flush(void);\r |
| 16 | void drain_wb(void);\r |
| 17 | // this should help to resolve race confition where shared var\r |
| 18 | // is changed by other core just before we update it\r |
| 19 | void set_if_not_changed(int *val, int oldval, int newval);\r |
| 20 | \r |
| 21 | void _memcpy(void *dst, const void *src, int count);\r |
| 22 | \r |
| 23 | // asm volatile ("mov r0, #0" ::: "r0");\r |
| 24 | // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */\r |
| 25 | // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */\r |
| 26 | \r |
| 27 | \r |
| 28 | static int find_sync_word(unsigned char *buf, int nBytes)\r |
| 29 | {\r |
| 30 | unsigned char *p, *pe;\r |
| 31 | \r |
| 32 | /* find byte-aligned syncword - need 12 (MPEG 1,2) or 11 (MPEG 2.5) matching bits */\r |
| 33 | for (p = buf, pe = buf + nBytes - 4; p < pe; p++)\r |
| 34 | {\r |
| 35 | int pn;\r |
| 36 | if (p[0] != 0xff) continue;\r |
| 37 | pn = p[1];\r |
| 38 | if ((pn & 0xf8) != 0xf8 || // currently must be MPEG1\r |
| 39 | (pn & 6) == 0) { // invalid layer\r |
| 40 | p++; continue;\r |
| 41 | }\r |
| 42 | pn = p[2];\r |
| 43 | if ((pn & 0xf0) < 0x20 || (pn & 0xf0) == 0xf0 || // bitrates\r |
| 44 | (pn & 0x0c) != 0) { // not 44kHz\r |
| 45 | continue;\r |
| 46 | }\r |
| 47 | \r |
| 48 | return p - buf;\r |
| 49 | }\r |
| 50 | \r |
| 51 | return -1;\r |
| 52 | }\r |
| 53 | \r |
| 54 | static void mp3_decode(void)\r |
| 55 | {\r |
| 56 | int mp3_offs = shared_ctl->mp3_offs;\r |
| 57 | unsigned char *readPtr = mp3_data + mp3_offs;\r |
| 58 | int bytesLeft = shared_ctl->mp3_len - mp3_offs;\r |
| 59 | int offset; // frame offset from readPtr\r |
| 60 | int retries = 0, err;\r |
| 61 | \r |
| 62 | if (bytesLeft <= 0) return; // EOF, nothing to do\r |
| 63 | \r |
| 64 | retry:\r |
| 65 | offset = find_sync_word(readPtr, bytesLeft);\r |
| 66 | if (offset < 0) {\r |
| 67 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r |
| 68 | return; // EOF\r |
| 69 | }\r |
| 70 | readPtr += offset;\r |
| 71 | bytesLeft -= offset;\r |
| 72 | \r |
| 73 | err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,\r |
| 74 | shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);\r |
| 75 | if (err) {\r |
| 76 | if (err == ERR_MP3_INDATA_UNDERFLOW) {\r |
| 77 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r |
| 78 | return;\r |
| 79 | } else if (err <= -6 && err >= -12) {\r |
| 80 | // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*\r |
| 81 | // just try to skip the offending frame..\r |
| 82 | readPtr++;\r |
| 83 | bytesLeft--;\r |
| 84 | if (retries++ < 2) goto retry;\r |
| 85 | }\r |
| 86 | shared_ctl->mp3_errors++;\r |
| 87 | shared_ctl->mp3_lasterr = err;\r |
| 88 | }\r |
| 89 | set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);\r |
| 90 | }\r |
| 91 | \r |
| 92 | static void ym_flush_writes(void)\r |
| 93 | {\r |
| 94 | UINT16 *wbuff;\r |
| 95 | int i;\r |
| 96 | \r |
| 97 | if (shared_ctl->writebuffsel == 1) {\r |
| 98 | wbuff = shared_ctl->writebuff1;\r |
| 99 | } else {\r |
| 100 | wbuff = shared_ctl->writebuff0;\r |
| 101 | }\r |
| 102 | \r |
| 103 | /* playback all writes */\r |
| 104 | for (i = 2048; i > 0; i--) {\r |
| 105 | UINT16 d = *wbuff++;\r |
| 106 | if (d == 0xffff) break;\r |
| 107 | if (d == 0xfffe) continue;\r |
| 108 | YM2612Write_(d >> 8, d);\r |
| 109 | }\r |
| 110 | }\r |
| 111 | \r |
| 112 | static void ym_update(int *ym_buffer)\r |
| 113 | {\r |
| 114 | int i, dw;\r |
| 115 | int two_upds = 0;\r |
| 116 | UINT16 *wbuff;\r |
| 117 | \r |
| 118 | if (shared_ctl->writebuffsel == 1) {\r |
| 119 | wbuff = shared_ctl->writebuff1;\r |
| 120 | } else {\r |
| 121 | wbuff = shared_ctl->writebuff0;\r |
| 122 | }\r |
| 123 | \r |
| 124 | /* playback all writes */\r |
| 125 | for (i = 2048/2; i > 0; i--) {\r |
| 126 | UINT16 d;\r |
| 127 | dw = *(int *)wbuff;\r |
| 128 | d = dw;\r |
| 129 | wbuff++;\r |
| 130 | if (d == 0xffff) break;\r |
| 131 | if (d == 0xfffe) { two_upds=1; break; }\r |
| 132 | YM2612Write_(d >> 8, d);\r |
| 133 | d = (dw>>16);\r |
| 134 | wbuff++;\r |
| 135 | if (d == 0xffff) break;\r |
| 136 | if (d == 0xfffe) { two_upds=1; break; }\r |
| 137 | YM2612Write_(d >> 8, d);\r |
| 138 | }\r |
| 139 | \r |
| 140 | if (two_upds)\r |
| 141 | {\r |
| 142 | int len1 = shared_ctl->length / 2;\r |
| 143 | shared_ctl->ym_active_chs =\r |
| 144 | YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);\r |
| 145 | \r |
| 146 | for (i *= 2; i > 0; i--) {\r |
| 147 | UINT16 d = *wbuff++;\r |
| 148 | if (d == 0xffff) break;\r |
| 149 | YM2612Write_(d >> 8, d);\r |
| 150 | }\r |
| 151 | \r |
| 152 | ym_buffer += shared_ctl->stereo ? len1*2 : len1;\r |
| 153 | len1 = shared_ctl->length - len1;\r |
| 154 | \r |
| 155 | shared_ctl->ym_active_chs =\r |
| 156 | YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);\r |
| 157 | } else {\r |
| 158 | shared_ctl->ym_active_chs =\r |
| 159 | YM2612UpdateOne_(ym_buffer, shared_ctl->length, shared_ctl->stereo, 1);\r |
| 160 | }\r |
| 161 | }\r |
| 162 | \r |
| 163 | \r |
| 164 | void Main940(void)\r |
| 165 | {\r |
| 166 | int *ym_buffer = shared_data->ym_buffer;\r |
| 167 | int job = 0;\r |
| 168 | ym2612_940 = &shared_data->ym2612;\r |
| 169 | \r |
| 170 | \r |
| 171 | for (;;)\r |
| 172 | {\r |
| 173 | job = wait_get_job(job);\r |
| 174 | \r |
| 175 | shared_ctl->lastjob = job;\r |
| 176 | \r |
| 177 | switch (job)\r |
| 178 | {\r |
| 179 | case JOB940_INITALL:\r |
| 180 | /* ym2612 */\r |
| 181 | shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r |
| 182 | YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r |
| 183 | /* Helix mp3 decoder */\r |
| 184 | shared_data->mp3dec = MP3InitDecoder();\r |
| 185 | break;\r |
| 186 | \r |
| 187 | case JOB940_INVALIDATE_DCACHE:\r |
| 188 | drain_wb();\r |
| 189 | dcache_clean_flush();\r |
| 190 | break;\r |
| 191 | \r |
| 192 | case JOB940_YM2612RESETCHIP:\r |
| 193 | YM2612ResetChip_();\r |
| 194 | break;\r |
| 195 | \r |
| 196 | case JOB940_PICOSTATELOAD:\r |
| 197 | YM2612PicoStateLoad_();\r |
| 198 | break;\r |
| 199 | \r |
| 200 | case JOB940_PICOSTATESAVE2:\r |
| 201 | YM2612PicoStateSave2(0, 0);\r |
| 202 | _memcpy(shared_ctl->writebuff0, ym2612_940->REGS, 0x200);\r |
| 203 | break;\r |
| 204 | \r |
| 205 | case JOB940_PICOSTATELOAD2_PREP:\r |
| 206 | ym_flush_writes();\r |
| 207 | break;\r |
| 208 | \r |
| 209 | case JOB940_PICOSTATELOAD2:\r |
| 210 | _memcpy(ym2612_940->REGS, shared_ctl->writebuff0, 0x200);\r |
| 211 | YM2612PicoStateLoad2(0, 0);\r |
| 212 | break;\r |
| 213 | \r |
| 214 | case JOB940_YM2612UPDATEONE:\r |
| 215 | ym_update(ym_buffer);\r |
| 216 | break;\r |
| 217 | \r |
| 218 | case JOB940_MP3DECODE:\r |
| 219 | mp3_decode();\r |
| 220 | break;\r |
| 221 | \r |
| 222 | case JOB940_MP3RESET:\r |
| 223 | if (shared_data->mp3dec) MP3FreeDecoder(shared_data->mp3dec);\r |
| 224 | shared_data->mp3dec = MP3InitDecoder();\r |
| 225 | break;\r |
| 226 | }\r |
| 227 | \r |
| 228 | shared_ctl->loopc++;\r |
| 229 | dcache_clean();\r |
| 230 | }\r |
| 231 | }\r |
| 232 | \r |