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1 | // The top-level functions for the ARM940\r |
2 | // (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r |
3 | \r |
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4 | #include "940shared.h"\r |
5 | \r |
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6 | static _940_data_t *shared_data = (_940_data_t *) 0x00100000;\r |
7 | static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;\r |
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8 | static unsigned char *mp3_data = (unsigned char *) 0x00400000;\r |
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9 | YM2612 *ym2612_940;\r |
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10 | \r |
11 | // from init.s\r |
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12 | int wait_get_job(int oldjob);\r |
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13 | void spend_cycles(int c);\r |
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14 | void dcache_clean(void);\r |
15 | void dcache_clean_flush(void);\r |
16 | void drain_wb(void);\r |
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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 |
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20 | \r |
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21 | void _memcpy(void *dst, const void *src, int count);\r |
22 | \r |
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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 |
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27 | \r |
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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 |
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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 |
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60 | int retries = 0, err;\r |
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61 | \r |
62 | if (bytesLeft <= 0) return; // EOF, nothing to do\r |
63 | \r |
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64 | retry:\r |
65 | offset = find_sync_word(readPtr, bytesLeft);\r |
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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 |
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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 |
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83 | bytesLeft--;\r |
84 | if (retries++ < 2) goto retry;\r |
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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 |
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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 |
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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 |
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140 | if (two_upds)\r |
141 | {\r |
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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 |
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163 | \r |
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164 | void Main940(void)\r |
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165 | {\r |
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166 | int *ym_buffer = shared_data->ym_buffer;\r |
167 | int job = 0;\r |
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168 | ym2612_940 = &shared_data->ym2612;\r |
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169 | \r |
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170 | \r |
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171 | for (;;)\r |
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172 | {\r |
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173 | job = wait_get_job(job);\r |
174 | \r |
175 | shared_ctl->lastjob = job;\r |
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176 | \r |
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177 | switch (job)\r |
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178 | {\r |
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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 |
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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 |
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214 | case JOB940_YM2612UPDATEONE:\r |
215 | ym_update(ym_buffer);\r |
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216 | break;\r |
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217 | \r |
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218 | case JOB940_MP3DECODE:\r |
219 | mp3_decode();\r |
220 | break;\r |
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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 |
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226 | }\r |
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227 | \r |
228 | shared_ctl->loopc++;\r |
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229 | dcache_clean();\r |
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230 | }\r |
231 | }\r |
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232 | \r |