vsync bugfix + refactoring
[picodrive.git] / platform / gp2x / code940 / 940.c
CommitLineData
6cadc2da 1// The top-level functions for the ARM940\r
2// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r
3\r
cc68a136 4#include "940shared.h"\r
5\r
42c7b147 6static _940_data_t *shared_data = (_940_data_t *) 0x00100000;\r
7static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;\r
e362c573 8static unsigned char *mp3_data = (unsigned char *) 0x00400000;\r
cc68a136 9YM2612 *ym2612_940;\r
cc68a136 10\r
11// from init.s\r
abe0ea43 12int wait_get_job(int oldjob);\r
cc68a136 13void spend_cycles(int c);\r
abe0ea43 14void dcache_clean(void);\r
15void dcache_clean_flush(void);\r
16void drain_wb(void);\r
51a902ae 17// this should help to resolve race confition where shared var\r
18// is changed by other core just before we update it\r
19void set_if_not_changed(int *val, int oldval, int newval);\r
cc68a136 20\r
e4fb433c 21void _memcpy(void *dst, const void *src, int count);\r
22\r
cc68a136 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
51a902ae 27\r
091facb8 28static 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
51a902ae 54static 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
091facb8 60 int retries = 0, err;\r
51a902ae 61\r
62 if (bytesLeft <= 0) return; // EOF, nothing to do\r
63\r
7c34867a 64 for (retries = 0; retries < 2; retries++)\r
65 {\r
66 offset = find_sync_word(readPtr, bytesLeft);\r
67 if (offset < 0)\r
68 goto set_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_MAINDATA_UNDERFLOW)\r
77 // just need another frame\r
78 continue;\r
79\r
80 if (err == ERR_MP3_INDATA_UNDERFLOW)\r
81 goto set_eof;\r
82\r
83 if (err <= -6 && err >= -12) {\r
84 // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*\r
85 // just try to skip the offending frame..\r
86 readPtr++;\r
87 bytesLeft--;\r
88 continue;\r
89 }\r
90 shared_ctl->mp3_errors++;\r
91 shared_ctl->mp3_lasterr = err;\r
51a902ae 92 }\r
7c34867a 93 break;\r
51a902ae 94 }\r
7c34867a 95\r
51a902ae 96 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);\r
7c34867a 97 return;\r
98\r
99set_eof:\r
100 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r
51a902ae 101}\r
102\r
e4fb433c 103static void ym_flush_writes(void)\r
104{\r
105 UINT16 *wbuff;\r
106 int i;\r
107\r
108 if (shared_ctl->writebuffsel == 1) {\r
109 wbuff = shared_ctl->writebuff1;\r
110 } else {\r
111 wbuff = shared_ctl->writebuff0;\r
112 }\r
113\r
114 /* playback all writes */\r
115 for (i = 2048; i > 0; i--) {\r
116 UINT16 d = *wbuff++;\r
117 if (d == 0xffff) break;\r
118 if (d == 0xfffe) continue;\r
119 YM2612Write_(d >> 8, d);\r
120 }\r
121}\r
122\r
2433f409 123static void ym_update(int *ym_buffer)\r
124{\r
125 int i, dw;\r
126 int two_upds = 0;\r
127 UINT16 *wbuff;\r
128\r
129 if (shared_ctl->writebuffsel == 1) {\r
130 wbuff = shared_ctl->writebuff1;\r
131 } else {\r
132 wbuff = shared_ctl->writebuff0;\r
133 }\r
134\r
135 /* playback all writes */\r
136 for (i = 2048/2; i > 0; i--) {\r
137 UINT16 d;\r
138 dw = *(int *)wbuff;\r
139 d = dw;\r
140 wbuff++;\r
141 if (d == 0xffff) break;\r
142 if (d == 0xfffe) { two_upds=1; break; }\r
143 YM2612Write_(d >> 8, d);\r
144 d = (dw>>16);\r
145 wbuff++;\r
146 if (d == 0xffff) break;\r
147 if (d == 0xfffe) { two_upds=1; break; }\r
148 YM2612Write_(d >> 8, d);\r
149 }\r
150\r
e4fb433c 151 if (two_upds)\r
152 {\r
2433f409 153 int len1 = shared_ctl->length / 2;\r
154 shared_ctl->ym_active_chs =\r
155 YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);\r
156\r
157 for (i *= 2; i > 0; i--) {\r
158 UINT16 d = *wbuff++;\r
159 if (d == 0xffff) break;\r
160 YM2612Write_(d >> 8, d);\r
161 }\r
162\r
163 ym_buffer += shared_ctl->stereo ? len1*2 : len1;\r
164 len1 = shared_ctl->length - len1;\r
165\r
166 shared_ctl->ym_active_chs =\r
167 YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);\r
168 } else {\r
169 shared_ctl->ym_active_chs =\r
170 YM2612UpdateOne_(ym_buffer, shared_ctl->length, shared_ctl->stereo, 1);\r
171 }\r
172}\r
173\r
51a902ae 174\r
abe0ea43 175void Main940(void)\r
cc68a136 176{\r
abe0ea43 177 int *ym_buffer = shared_data->ym_buffer;\r
178 int job = 0;\r
cc68a136 179 ym2612_940 = &shared_data->ym2612;\r
cc68a136 180\r
cc68a136 181\r
abe0ea43 182 for (;;)\r
cc68a136 183 {\r
abe0ea43 184 job = wait_get_job(job);\r
185\r
186 shared_ctl->lastjob = job;\r
cc68a136 187\r
abe0ea43 188 switch (job)\r
cc68a136 189 {\r
abe0ea43 190 case JOB940_INITALL:\r
191 /* ym2612 */\r
192 shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r
193 YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r
194 /* Helix mp3 decoder */\r
195 shared_data->mp3dec = MP3InitDecoder();\r
196 break;\r
197\r
198 case JOB940_INVALIDATE_DCACHE:\r
199 drain_wb();\r
200 dcache_clean_flush();\r
201 break;\r
202\r
203 case JOB940_YM2612RESETCHIP:\r
204 YM2612ResetChip_();\r
205 break;\r
206\r
207 case JOB940_PICOSTATELOAD:\r
208 YM2612PicoStateLoad_();\r
209 break;\r
210\r
e4fb433c 211 case JOB940_PICOSTATESAVE2:\r
212 YM2612PicoStateSave2(0, 0);\r
213 _memcpy(shared_ctl->writebuff0, ym2612_940->REGS, 0x200);\r
214 break;\r
215\r
216 case JOB940_PICOSTATELOAD2_PREP:\r
217 ym_flush_writes();\r
218 break;\r
219\r
220 case JOB940_PICOSTATELOAD2:\r
221 _memcpy(ym2612_940->REGS, shared_ctl->writebuff0, 0x200);\r
222 YM2612PicoStateLoad2(0, 0);\r
223 break;\r
224\r
2433f409 225 case JOB940_YM2612UPDATEONE:\r
226 ym_update(ym_buffer);\r
abe0ea43 227 break;\r
cc68a136 228\r
abe0ea43 229 case JOB940_MP3DECODE:\r
230 mp3_decode();\r
231 break;\r
091facb8 232\r
233 case JOB940_MP3RESET:\r
234 if (shared_data->mp3dec) MP3FreeDecoder(shared_data->mp3dec);\r
235 shared_data->mp3dec = MP3InitDecoder();\r
236 break;\r
abe0ea43 237 }\r
42c7b147 238\r
239 shared_ctl->loopc++;\r
abe0ea43 240 dcache_clean();\r
cc68a136 241 }\r
242}\r
b837b69b 243\r