1 #include "940shared.h"
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3 static _940_data_t *shared_data = (_940_data_t *) 0x00100000;
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4 static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;
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5 static unsigned char *mp3_data = (unsigned char *) 0x01000000;
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10 void wait_irq(void);
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11 void spend_cycles(int c);
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12 void cache_clean(void);
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13 void cache_clean_flush(void);
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15 // asm volatile ("mov r0, #0" ::: "r0");
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16 // asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */
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17 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
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19 void Main940(int startvector)
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21 ym2612_940 = &shared_data->ym2612;
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22 mix_buffer = shared_data->mix_buffer;
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25 shared_ctl->vstarts[startvector]++;
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26 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");
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33 while (!shared_ctl->busy)
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35 //shared_ctl->waitc++;
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36 spend_cycles(8*1024);
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39 if (!shared_ctl->busy)
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44 for (job_num = 0; job_num < MAX_940JOBS; job_num++)
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46 switch (shared_ctl->jobs[job_num])
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48 case JOB940_INITALL:
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50 shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;
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51 YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);
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52 /* Helix mp3 decoder */
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53 shared_data->mp3dec = MP3InitDecoder();
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56 case JOB940_YM2612RESETCHIP:
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60 case JOB940_PICOSTATELOAD:
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61 YM2612PicoStateLoad_();
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64 case JOB940_YM2612UPDATEONE: {
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66 if (shared_ctl->writebuffsel == 1) {
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67 wbuff = (int *) shared_ctl->writebuff1;
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69 wbuff = (int *) shared_ctl->writebuff0;
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72 /* playback all writes */
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73 for (i = 2048/2; i > 0; i--) {
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77 if (d == 0xffff) break;
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78 YM2612Write_(d >> 8, d);
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80 if (d == 0xffff) break;
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81 YM2612Write_(d >> 8, d);
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84 YM2612UpdateOne_(0, shared_ctl->length, shared_ctl->stereo);
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88 case JOB940_MP3DECODE: {
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89 int mp3_offs = shared_ctl->mp3_offs;
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90 unsigned char *readPtr = mp3_data + mp3_offs;
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91 int bytesLeft = shared_ctl->mp3_len - mp3_offs;
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92 int offset; // frame offset from readPtr
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95 if (bytesLeft <= 0) break; // EOF, nothing to do
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97 offset = MP3FindSyncWord(readPtr, bytesLeft);
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99 shared_ctl->mp3_offs = shared_ctl->mp3_len;
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103 bytesLeft -= offset;
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105 err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,
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106 shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);
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108 if (err == ERR_MP3_INDATA_UNDERFLOW) {
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109 shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF
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111 } else if (err <= -6 && err >= -12) {
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112 // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
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113 // just try to skip the offending frame..
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116 shared_ctl->mp3_errors++;
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117 shared_ctl->mp3_lasterr = err;
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119 shared_ctl->mp3_offs = readPtr - mp3_data;
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126 // asm volatile ("mov r0, #0" ::: "r0");
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127 // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */
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128 // cache_clean_flush();
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130 shared_ctl->loopc++;
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131 shared_ctl->busy = 0;
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