1 // This is part of Pico Library
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3 // (c) Copyright 2004 Dave, All rights reserved.
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4 // (c) Copyright 2006,2007 notaz, All rights reserved.
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5 // Free for non-commercial use.
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7 // For commercial use, separate licencing terms must be obtained.
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12 #include "sn76496.h"
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14 #include "../PicoInt.h"
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15 #include "../cd/pcm.h"
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18 void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_stereo;
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20 // master int buffer to mix to
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21 static int PsndBuffer[2*44100/50];
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24 static unsigned short dac_info[312+4]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
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26 // cdda output buffer
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27 short cdda_out_buffer[2*1152];
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31 int PsndLen=0; // number of mono samples, multiply by 2 for stereo
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32 int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60
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33 int PsndLen_exc_cnt=0;
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35 short *PsndOut=NULL; // PCM data buffer
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38 int timer_a_next_oflow, timer_a_step; // in z80 cycles
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42 extern int *sn76496_regs;
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45 static void dac_recalculate(void)
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47 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
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49 if(PsndLen <= lines) {
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55 for(i=226; i != 225; i++) {
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56 if (i >= lines) i = 0;
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64 dac_info[i] = (pos<<4)|len;
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70 for(i = 225; i != 224; i++) {
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71 if (i >= lines) i = 0;
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73 while(dac_cnt >= 0) {
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77 if (i == mid) // midpoint
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78 while(pos+len < PsndLen/2) {
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83 dac_info[i] = (pos<<4)|len;
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87 for(len = 0, i = pos; i < PsndLen; i++) len++;
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88 if (PsndLen_exc_add) len++;
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89 dac_info[224] = (pos<<4)|len;
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91 for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)
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93 //for(i=len=0; i < lines; i++) {
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94 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);
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95 // len+=dac_info[i]&0xf;
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97 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));
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98 //printf("len total: %i, last pos: %i\n", len, pos);
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103 PICO_INTERNAL void PsndReset(void)
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107 // also clear the internal registers+addr line
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108 ym2612_regs = YM2612GetRegs();
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109 memset(ym2612_regs, 0, 0x200+4);
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116 // to be called after changing sound rate or chips
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117 void PsndRerate(int preserve_state)
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119 void *state = NULL;
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120 int target_fps = Pico.m.pal ? 50 : 60;
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122 // not all rates are supported in MCD mode due to mp3 decoder limitations
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123 if (PicoAHW & PAHW_MCD) {
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124 if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;
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125 PicoOpt |= POPT_EN_STEREO; // force stereo
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128 if (preserve_state) {
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129 state = malloc(0x200);
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130 if (state == NULL) return;
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131 memcpy(state, YM2612GetRegs(), 0x200);
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133 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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134 if (preserve_state) {
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135 // feed it back it's own registers, just like after loading state
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136 memcpy(YM2612GetRegs(), state, 0x200);
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137 YM2612PicoStateLoad();
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138 if ((PicoAHW & PAHW_MCD) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
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142 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
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143 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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144 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
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149 // calculate PsndLen
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150 PsndLen=PsndRate / target_fps;
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151 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;
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154 // recalculate dac info
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157 if (PicoAHW & PAHW_MCD)
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158 pcm_set_rate(PsndRate);
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160 // clear all buffers
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161 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);
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162 memset(cdda_out_buffer, 0, sizeof(cdda_out_buffer));
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167 PsndMix_32_to_16l = (PicoOpt & POPT_EN_STEREO) ? mix_32_to_16l_stereo : mix_32_to_16_mono;
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169 if (PicoAHW & PAHW_PICO)
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174 PICO_INTERNAL void PsndDoDAC(int line_to)
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176 int pos, pos1, len;
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177 int dout = ym2612.dacout;
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178 int line_from = PsndDacLine;
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180 PsndDacLine = line_to + 1;
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182 pos =dac_info[line_from]>>4;
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183 pos1=dac_info[line_to];
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184 len = ((pos1>>4)-pos) + (pos1&0xf);
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187 if (PicoOpt & POPT_EN_STEREO) {
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188 short *d = PsndOut + pos*2;
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189 for (; len > 0; len--, d+=2) *d = dout;
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191 short *d = PsndOut + pos;
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192 for (; len > 0; len--, d++) *d = dout;
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197 int *d = PsndBuffer;
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198 d += (PicoOpt&8) ? pos*2 : pos;
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199 pcm_update(d, len, 1);
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205 static pm_file *cdda_stream = NULL;
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207 static void cdda_raw_update(int *buffer, int length)
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209 int ret, cdda_bytes;
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210 if (cdda_stream == NULL) return;
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212 cdda_bytes = length*4;
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213 if (PsndRate <= 22050) cdda_bytes *= 2;
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214 if (PsndRate < 22050) cdda_bytes *= 2;
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216 ret = pm_read(cdda_out_buffer, cdda_bytes, cdda_stream);
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217 if (ret < cdda_bytes) {
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218 memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);
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219 cdda_stream = NULL;
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224 switch (PsndRate) {
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225 case 44100: mix_16h_to_32(buffer, cdda_out_buffer, length*2); break;
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226 case 22050: mix_16h_to_32_s1(buffer, cdda_out_buffer, length*2); break;
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227 case 11025: mix_16h_to_32_s2(buffer, cdda_out_buffer, length*2); break;
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231 PICO_INTERNAL void cdda_start_play(void)
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233 int lba_offset, index, lba_length, i;
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235 elprintf(EL_STATUS, "cdda play track #%i", Pico_mcd->scd.Cur_Track);
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237 index = Pico_mcd->scd.Cur_Track - 1;
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239 lba_offset = Pico_mcd->scd.Cur_LBA - Track_to_LBA(index + 1);
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240 if (lba_offset < 0) lba_offset = 0;
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241 lba_offset += Pico_mcd->TOC.Tracks[index].Offset;
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243 // find the actual file for this track
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244 for (i = index; i >= 0; i--)
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245 if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
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247 if (Pico_mcd->TOC.Tracks[i].F == NULL) {
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248 elprintf(EL_STATUS|EL_ANOMALY, "no track?!");
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252 if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_MP3)
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256 lba_length = Pico_mcd->TOC.Tracks[i].Length;
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257 for (i++; i < Pico_mcd->TOC.Last_Track; i++) {
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258 if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
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259 lba_length += Pico_mcd->TOC.Tracks[i].Length;
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263 pos1024 = lba_offset * 1024 / lba_length;
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265 mp3_start_play(Pico_mcd->TOC.Tracks[index].F, pos1024);
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269 cdda_stream = Pico_mcd->TOC.Tracks[i].F;
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270 PicoCDBufferFlush(); // buffering relies on fp not being touched
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271 pm_seek(cdda_stream, lba_offset * 2352, SEEK_SET);
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272 if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_WAV)
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274 // skip headers, assume it's 44kHz stereo uncompressed
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275 pm_seek(cdda_stream, 44, SEEK_CUR);
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280 PICO_INTERNAL void PsndClear(void)
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283 if (PsndLen_exc_add) len++;
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284 if (PicoOpt & POPT_EN_STEREO)
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285 memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned
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287 short *out = PsndOut;
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288 if ((int)out & 2) { *out++ = 0; len--; }
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289 memset32((int *) out, 0, len/2);
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290 if (len & 1) out[len-1] = 0;
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295 PICO_INTERNAL int PsndRender(int offset, int length)
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297 int buf32_updated = 0;
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298 int *buf32 = PsndBuffer+offset;
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299 int stereo = (PicoOpt & 8) >> 3;
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300 // emulating CD && PCM option enabled && PCM chip on && have enabled channels
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301 int do_pcm = (PicoAHW & PAHW_MCD) && (PicoOpt&POPT_EN_MCD_PCM) &&
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302 (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;
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305 #if !SIMPLE_WRITE_SOUND
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306 if (offset == 0) { // should happen once per frame
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307 // compensate for float part of PsndLen
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308 PsndLen_exc_cnt += PsndLen_exc_add;
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309 if (PsndLen_exc_cnt >= 0x10000) {
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310 PsndLen_exc_cnt -= 0x10000;
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317 if (PicoOpt & POPT_EN_PSG)
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318 SN76496Update(PsndOut+offset, length, stereo);
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320 if (PicoAHW & PAHW_PICO) {
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321 PicoPicoPCMUpdate(PsndOut+offset, length, stereo);
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325 // Add in the stereo FM buffer
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326 if (PicoOpt & POPT_EN_FM) {
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327 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);
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329 memset32(buf32, 0, length<<stereo);
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331 //printf("active_chs: %02x\n", buf32_updated);
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335 pcm_update(buf32, length, stereo);
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336 //buf32_updated = 1;
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340 // CD mode, cdda enabled, not data track, CDC is reading
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341 if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA) &&
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342 !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
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344 // note: only 44, 22 and 11 kHz supported, with forced stereo
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345 int index = Pico_mcd->scd.Cur_Track - 1;
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347 if (Pico_mcd->TOC.Tracks[index].ftype == TYPE_MP3)
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348 mp3_update(buf32, length, stereo);
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350 cdda_raw_update(buf32, length);
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353 // convert + limit to normal 16bit output
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354 PsndMix_32_to_16l(PsndOut+offset, buf32, length);
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360 // -----------------------------------------------------------------
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364 #if defined(_USE_MZ80)
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366 // memhandlers for mz80 core
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367 unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
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368 void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
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370 // structures for mz80 core
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371 static struct MemoryReadByte mz80_mem_read[]=
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373 {0x0000,0xffff,mz80_read},
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374 {(UINT32) -1,(UINT32) -1,NULL}
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376 static struct MemoryWriteByte mz80_mem_write[]=
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378 {0x0000,0xffff,mz80_write},
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379 {(UINT32) -1,(UINT32) -1,NULL}
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381 static struct z80PortRead mz80_io_read[] ={
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382 {(UINT16) -1,(UINT16) -1,NULL}
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384 static struct z80PortWrite mz80_io_write[]={
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385 {(UINT16) -1,(UINT16) -1,NULL}
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388 int mz80_run(int cycles)
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390 int ticks_pre = mz80GetElapsedTicks(0);
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392 return mz80GetElapsedTicks(0) - ticks_pre;
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395 #elif defined(_USE_DRZ80)
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397 struct DrZ80 drZ80;
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399 static unsigned int DrZ80_rebasePC(unsigned short a)
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401 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
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402 return drZ80.Z80PC_BASE + a;
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405 static unsigned int DrZ80_rebaseSP(unsigned short a)
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407 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
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408 return drZ80.Z80SP_BASE + a;
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411 static void DrZ80_irq_callback()
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413 drZ80.Z80_IRQ = 0; // lower irq when accepted
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417 #if defined(_USE_DRZ80) || defined(_USE_CZ80)
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418 static unsigned char z80_in(unsigned short p)
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420 elprintf(EL_ANOMALY, "Z80 port %04x read", p);
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424 static void z80_out(unsigned short p,unsigned char d)
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426 elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);
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431 // z80 functionality wrappers
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432 PICO_INTERNAL void z80_init(void)
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434 #if defined(_USE_MZ80)
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435 struct mz80context z80;
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439 // Modify the default context
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440 mz80GetContext(&z80);
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442 // point mz80 stuff
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443 z80.z80Base=Pico.zram;
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444 z80.z80MemRead=mz80_mem_read;
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445 z80.z80MemWrite=mz80_mem_write;
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446 z80.z80IoRead=mz80_io_read;
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447 z80.z80IoWrite=mz80_io_write;
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449 mz80SetContext(&z80);
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451 #elif defined(_USE_DRZ80)
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452 memset(&drZ80, 0, sizeof(struct DrZ80));
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453 drZ80.z80_rebasePC=DrZ80_rebasePC;
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454 drZ80.z80_rebaseSP=DrZ80_rebaseSP;
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455 drZ80.z80_read8 =z80_read;
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456 drZ80.z80_read16 =z80_read16;
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457 drZ80.z80_write8 =z80_write;
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458 drZ80.z80_write16 =z80_write16;
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459 drZ80.z80_in =z80_in;
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460 drZ80.z80_out =z80_out;
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461 drZ80.z80_irq_callback=DrZ80_irq_callback;
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463 #elif defined(_USE_CZ80)
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464 memset(&CZ80, 0, sizeof(CZ80));
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466 Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM
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467 Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror
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468 Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)
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469 Cz80_Set_WriteB(&CZ80, z80_write);
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470 Cz80_Set_INPort(&CZ80, z80_in);
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471 Cz80_Set_OUTPort(&CZ80, z80_out);
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475 PICO_INTERNAL void z80_reset(void)
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477 #if defined(_USE_MZ80)
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479 #elif defined(_USE_DRZ80)
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480 memset(&drZ80, 0, 0x54);
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481 drZ80.Z80F = (1<<2); // set ZFlag
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482 drZ80.Z80F2 = (1<<2); // set ZFlag
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483 drZ80.Z80IX = 0xFFFF << 16;
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484 drZ80.Z80IY = 0xFFFF << 16;
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485 drZ80.Z80IM = 0; // 1?
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486 drZ80.Z80PC = drZ80.z80_rebasePC(0);
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487 drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
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488 #elif defined(_USE_CZ80)
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490 Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
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491 Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
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492 Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
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494 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
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498 PICO_INTERNAL void z80_pack(unsigned char *data)
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500 #if defined(_USE_MZ80)
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501 struct mz80context mz80;
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502 *(int *)data = 0x00005A6D; // "mZ"
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503 mz80GetContext(&mz80);
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504 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
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505 #elif defined(_USE_DRZ80)
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506 *(int *)data = 0x015A7244; // "DrZ" v1
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507 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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508 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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509 memcpy(data+4, &drZ80, 0x54);
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510 #elif defined(_USE_CZ80)
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511 *(int *)data = 0x00007a43; // "Cz"
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512 *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
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513 memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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517 PICO_INTERNAL void z80_unpack(unsigned char *data)
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519 #if defined(_USE_MZ80)
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520 if (*(int *)data == 0x00005A6D) { // "mZ" save?
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521 struct mz80context mz80;
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522 mz80GetContext(&mz80);
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523 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
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524 mz80SetContext(&mz80);
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529 #elif defined(_USE_DRZ80)
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530 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
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531 memcpy(&drZ80, data+4, 0x54);
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533 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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534 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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538 z80_int(); // try to goto int handler, maybe we won't execute trash there?
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540 #elif defined(_USE_CZ80)
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541 if (*(int *)data == 0x00007a43) { // "Cz" save?
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542 memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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543 Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
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551 PICO_INTERNAL void z80_exit(void)
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553 #if defined(_USE_MZ80)
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558 #if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)
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559 PICO_INTERNAL void z80_debug(char *dstr)
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561 #if defined(_USE_DRZ80)
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562 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
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563 #elif defined(_USE_CZ80)
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564 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);
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