sound code rewrite for lower sample rates (except mp3s)
[picodrive.git] / platform / gp2x / code940 / 940.c
CommitLineData
cc68a136 1#include "940shared.h"\r
2\r
42c7b147 3static _940_data_t *shared_data = (_940_data_t *) 0x00100000;\r
4static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;\r
5static unsigned char *mp3_data = (unsigned char *) 0x01000000;\r
cc68a136 6YM2612 *ym2612_940;\r
cc68a136 7\r
8// from init.s\r
9void wait_irq(void);\r
10void spend_cycles(int c);\r
11void cache_clean(void);\r
12void cache_clean_flush(void);\r
51a902ae 13// this should help to resolve race confition where shared var\r
14// is changed by other core just before we update it\r
15void set_if_not_changed(int *val, int oldval, int newval);\r
cc68a136 16\r
17// asm volatile ("mov r0, #0" ::: "r0");\r
18// asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */\r
19// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */\r
20\r
51a902ae 21\r
22static void mp3_decode(void)\r
23{\r
24 int mp3_offs = shared_ctl->mp3_offs;\r
25 unsigned char *readPtr = mp3_data + mp3_offs;\r
26 int bytesLeft = shared_ctl->mp3_len - mp3_offs;\r
27 int offset; // frame offset from readPtr\r
28 int err;\r
29\r
30 if (bytesLeft <= 0) return; // EOF, nothing to do\r
31\r
32 offset = MP3FindSyncWord(readPtr, bytesLeft);\r
33 if (offset < 0) {\r
34 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r
35 return; // EOF\r
36 }\r
37 readPtr += offset;\r
38 bytesLeft -= offset;\r
39\r
40 err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,\r
41 shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);\r
42 if (err) {\r
43 if (err == ERR_MP3_INDATA_UNDERFLOW) {\r
44 shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF\r
45 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);\r
46 return;\r
47 } else if (err <= -6 && err >= -12) {\r
48 // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*\r
49 // just try to skip the offending frame..\r
50 readPtr++;\r
51 }\r
52 shared_ctl->mp3_errors++;\r
53 shared_ctl->mp3_lasterr = err;\r
54 }\r
55 set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);\r
56}\r
57\r
58\r
4f265db7 59void Main940(int startvector, int pc_at_irq)\r
cc68a136 60{\r
7a93adeb 61 int mix_buffer = shared_data->mix_buffer;\r
cc68a136 62 ym2612_940 = &shared_data->ym2612;\r
cc68a136 63\r
64 // debug\r
65 shared_ctl->vstarts[startvector]++;\r
4f265db7 66 shared_ctl->last_irq_pc = pc_at_irq;\r
42c7b147 67 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");\r
cc68a136 68\r
cc68a136 69\r
4f265db7 70// for (;;)\r
cc68a136 71 {\r
42c7b147 72 int job_num = 0;\r
cc68a136 73/*\r
74 while (!shared_ctl->busy)\r
75 {\r
76 //shared_ctl->waitc++;\r
42c7b147 77 spend_cycles(8*1024);\r
cc68a136 78 }\r
79*/\r
4f265db7 80/*\r
cc68a136 81 if (!shared_ctl->busy)\r
82 {\r
83 wait_irq();\r
84 }\r
4f265db7 85 shared_ctl->lastbusy = shared_ctl->busy;\r
86*/\r
cc68a136 87\r
b837b69b 88 for (job_num = 0; job_num < MAX_940JOBS; job_num++)\r
cc68a136 89 {\r
4f265db7 90 shared_ctl->lastjob = (job_num << 8) | shared_ctl->jobs[job_num];\r
91\r
b837b69b 92 switch (shared_ctl->jobs[job_num])\r
93 {\r
42c7b147 94 case JOB940_INITALL:\r
95 /* ym2612 */\r
b837b69b 96 shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r
97 YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r
42c7b147 98 /* Helix mp3 decoder */\r
99 shared_data->mp3dec = MP3InitDecoder();\r
b837b69b 100 break;\r
cc68a136 101\r
b837b69b 102 case JOB940_YM2612RESETCHIP:\r
103 YM2612ResetChip_();\r
104 break;\r
cc68a136 105\r
b837b69b 106 case JOB940_PICOSTATELOAD:\r
107 YM2612PicoStateLoad_();\r
108 break;\r
cc68a136 109\r
b837b69b 110 case JOB940_YM2612UPDATEONE: {\r
111 int i, dw, *wbuff;\r
112 if (shared_ctl->writebuffsel == 1) {\r
113 wbuff = (int *) shared_ctl->writebuff1;\r
114 } else {\r
115 wbuff = (int *) shared_ctl->writebuff0;\r
116 }\r
cc68a136 117\r
b837b69b 118 /* playback all writes */\r
119 for (i = 2048/2; i > 0; i--) {\r
120 UINT16 d;\r
121 dw = *wbuff++;\r
122 d = dw;\r
123 if (d == 0xffff) break;\r
124 YM2612Write_(d >> 8, d);\r
125 d = (dw>>16);\r
126 if (d == 0xffff) break;\r
127 YM2612Write_(d >> 8, d);\r
128 }\r
cc68a136 129\r
4f265db7 130 YM2612UpdateOne_(mix_buffer, shared_ctl->length, shared_ctl->stereo, 1);\r
b837b69b 131 break;\r
132 }\r
42c7b147 133\r
51a902ae 134 case JOB940_MP3DECODE:\r
135 mp3_decode();\r
42c7b147 136 break;\r
cc68a136 137 }\r
138 }\r
139\r
b837b69b 140 cache_clean();\r
141// asm volatile ("mov r0, #0" ::: "r0");\r
142// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */\r
42c7b147 143// cache_clean_flush();\r
144\r
145 shared_ctl->loopc++;\r
4f265db7 146\r
147// // shared_ctl->busy = 0; // shared mem is not reliable?\r
148\r
149 wait_irq();\r
cc68a136 150 }\r
151}\r
b837b69b 152\r