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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13 #include "../pico_int.h"
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14 #include "../cd/pcm.h"
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17 void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_stereo;
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19 // master int buffer to mix to
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20 static int PsndBuffer[2*(44100+100)/50];
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23 static unsigned short dac_info[312+4]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
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25 // cdda output buffer
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26 short cdda_out_buffer[2*1152];
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30 int PsndLen=0; // number of mono samples, multiply by 2 for stereo
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31 int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60
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32 int PsndLen_exc_cnt=0;
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34 short *PsndOut=NULL; // PCM data buffer
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37 int timer_a_next_oflow, timer_a_step; // in z80 cycles
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38 int timer_b_next_oflow, timer_b_step;
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41 extern int *sn76496_regs;
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44 static void dac_recalculate(void)
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46 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
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48 if (PsndLen <= lines)
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55 for(i=226; i != 225; i++)
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57 if (i >= lines) i = 0;
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65 dac_info[i] = (pos<<4)|len;
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73 for(i = 225; i != 224; i++)
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75 if (i >= lines) i = 0;
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77 while(dac_cnt >= 0) {
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81 if (i == mid) // midpoint
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82 while(pos+len < PsndLen/2) {
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87 dac_info[i] = (pos<<4)|len;
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91 for(len = 0, i = pos; i < PsndLen; i++) len++;
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92 if (PsndLen_exc_add) len++;
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93 dac_info[224] = (pos<<4)|len;
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95 mid = (dac_info[lines-1] & 0xfff0) + ((dac_info[lines-1] & 0xf) << 4);
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96 for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)
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98 //for(i=len=0; i < lines; i++) {
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99 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);
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100 // len+=dac_info[i]&0xf;
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102 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));
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103 //printf("len total: %i, last pos: %i\n", len, pos);
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108 PICO_INTERNAL void PsndReset(void)
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112 // also clear the internal registers+addr line
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113 ym2612_regs = YM2612GetRegs();
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114 memset(ym2612_regs, 0, 0x200+4);
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121 // to be called after changing sound rate or chips
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122 void PsndRerate(int preserve_state)
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124 void *state = NULL;
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125 int target_fps = Pico.m.pal ? 50 : 60;
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127 // not all rates are supported in MCD mode due to mp3 decoder limitations
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128 if (PicoAHW & PAHW_MCD) {
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129 if (!(11025-100 <= PsndRate && PsndRate <= 11025+100) &&
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130 !(22050-100 <= PsndRate && PsndRate <= 22050+100) &&
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131 !(44100-100 <= PsndRate && PsndRate <= 44100+100))
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133 PicoOpt |= POPT_EN_STEREO; // force stereo
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136 if (preserve_state) {
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137 state = malloc(0x204);
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138 if (state == NULL) return;
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139 ym2612_pack_state();
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140 memcpy(state, YM2612GetRegs(), 0x204);
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142 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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143 if (preserve_state) {
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144 // feed it back it's own registers, just like after loading state
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145 memcpy(YM2612GetRegs(), state, 0x204);
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146 ym2612_unpack_state();
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147 if ((PicoAHW & PAHW_MCD) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
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151 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
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152 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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153 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
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158 // calculate PsndLen
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159 PsndLen=PsndRate / target_fps;
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160 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;
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163 // recalculate dac info
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166 if (PicoAHW & PAHW_MCD)
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167 pcm_set_rate(PsndRate);
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169 // clear all buffers
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170 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);
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171 memset(cdda_out_buffer, 0, sizeof(cdda_out_buffer));
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176 PsndMix_32_to_16l = (PicoOpt & POPT_EN_STEREO) ? mix_32_to_16l_stereo : mix_32_to_16_mono;
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178 if (PicoAHW & PAHW_PICO)
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183 PICO_INTERNAL void PsndDoDAC(int line_to)
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185 int pos, pos1, len;
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186 int dout = ym2612.dacout;
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187 int line_from = PsndDacLine;
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189 PsndDacLine = line_to + 1;
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191 pos =dac_info[line_from]>>4;
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192 pos1=dac_info[line_to];
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193 len = ((pos1>>4)-pos) + (pos1&0xf);
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196 if (PicoOpt & POPT_EN_STEREO) {
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197 short *d = PsndOut + pos*2;
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198 for (; len > 0; len--, d+=2) *d = dout;
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200 short *d = PsndOut + pos;
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201 for (; len > 0; len--, d++) *d = dout;
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206 int *d = PsndBuffer;
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207 d += (PicoOpt&8) ? pos*2 : pos;
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208 pcm_update(d, len, 1);
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214 static pm_file *cdda_stream = NULL;
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216 static void cdda_raw_update(int *buffer, int length)
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218 int ret, cdda_bytes, mult = 1;
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219 if (cdda_stream == NULL)
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222 cdda_bytes = length*4;
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223 if (PsndRate <= 22050 + 100) mult = 2;
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224 if (PsndRate < 22050 - 100) mult = 4;
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225 cdda_bytes *= mult;
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227 ret = pm_read(cdda_out_buffer, cdda_bytes, cdda_stream);
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228 if (ret < cdda_bytes) {
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229 memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);
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230 cdda_stream = NULL;
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236 case 1: mix_16h_to_32(buffer, cdda_out_buffer, length*2); break;
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237 case 2: mix_16h_to_32_s1(buffer, cdda_out_buffer, length*2); break;
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238 case 4: mix_16h_to_32_s2(buffer, cdda_out_buffer, length*2); break;
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242 PICO_INTERNAL void cdda_start_play(void)
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244 int lba_offset, index, lba_length, i;
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246 elprintf(EL_STATUS, "cdda play track #%i", Pico_mcd->scd.Cur_Track);
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248 index = Pico_mcd->scd.Cur_Track - 1;
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250 lba_offset = Pico_mcd->scd.Cur_LBA - Track_to_LBA(index + 1);
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251 if (lba_offset < 0) lba_offset = 0;
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252 lba_offset += Pico_mcd->TOC.Tracks[index].Offset;
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254 // find the actual file for this track
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255 for (i = index; i >= 0; i--)
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256 if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
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258 if (Pico_mcd->TOC.Tracks[i].F == NULL) {
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259 elprintf(EL_STATUS|EL_ANOMALY, "no track?!");
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263 if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_MP3)
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267 lba_length = Pico_mcd->TOC.Tracks[i].Length;
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268 for (i++; i < Pico_mcd->TOC.Last_Track; i++) {
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269 if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
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270 lba_length += Pico_mcd->TOC.Tracks[i].Length;
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274 pos1024 = lba_offset * 1024 / lba_length;
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276 mp3_start_play(Pico_mcd->TOC.Tracks[index].F, pos1024);
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280 cdda_stream = Pico_mcd->TOC.Tracks[i].F;
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281 PicoCDBufferFlush(); // buffering relies on fp not being touched
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282 pm_seek(cdda_stream, lba_offset * 2352, SEEK_SET);
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283 if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_WAV)
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285 // skip headers, assume it's 44kHz stereo uncompressed
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286 pm_seek(cdda_stream, 44, SEEK_CUR);
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291 PICO_INTERNAL void PsndClear(void)
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294 if (PsndLen_exc_add) len++;
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295 if (PicoOpt & POPT_EN_STEREO)
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296 memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned
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298 short *out = PsndOut;
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299 if ((int)out & 2) { *out++ = 0; len--; }
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300 memset32((int *) out, 0, len/2);
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301 if (len & 1) out[len-1] = 0;
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306 static int PsndRender(int offset, int length)
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308 int buf32_updated = 0;
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309 int *buf32 = PsndBuffer+offset;
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310 int stereo = (PicoOpt & 8) >> 3;
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311 // emulating CD && PCM option enabled && PCM chip on && have enabled channels
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312 int do_pcm = (PicoAHW & PAHW_MCD) && (PicoOpt&POPT_EN_MCD_PCM) &&
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313 (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;
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316 #if !SIMPLE_WRITE_SOUND
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317 if (offset == 0) { // should happen once per frame
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318 // compensate for float part of PsndLen
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319 PsndLen_exc_cnt += PsndLen_exc_add;
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320 if (PsndLen_exc_cnt >= 0x10000) {
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321 PsndLen_exc_cnt -= 0x10000;
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328 if (PicoOpt & POPT_EN_PSG)
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329 SN76496Update(PsndOut+offset, length, stereo);
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331 if (PicoAHW & PAHW_PICO) {
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332 PicoPicoPCMUpdate(PsndOut+offset, length, stereo);
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336 // Add in the stereo FM buffer
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337 if (PicoOpt & POPT_EN_FM) {
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338 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);
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340 memset32(buf32, 0, length<<stereo);
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342 //printf("active_chs: %02x\n", buf32_updated);
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346 pcm_update(buf32, length, stereo);
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347 //buf32_updated = 1;
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351 // CD mode, cdda enabled, not data track, CDC is reading
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352 if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA) &&
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353 !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
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355 // note: only 44, 22 and 11 kHz supported, with forced stereo
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356 int index = Pico_mcd->scd.Cur_Track - 1;
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358 if (Pico_mcd->TOC.Tracks[index].ftype == TYPE_MP3)
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359 mp3_update(buf32, length, stereo);
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361 cdda_raw_update(buf32, length);
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364 // convert + limit to normal 16bit output
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365 PsndMix_32_to_16l(PsndOut+offset, buf32, length);
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370 // to be called on 224 or line_sample scanlines only
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371 PICO_INTERNAL void PsndGetSamples(int y)
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373 #if SIMPLE_WRITE_SOUND
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374 if (y != 224) return;
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375 PsndRender(0, PsndLen);
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376 if (PicoWriteSound) PicoWriteSound(PsndLen);
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379 static int curr_pos = 0;
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384 curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);
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385 else curr_pos = PsndRender(0, PsndLen);
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386 if (emustatus&1) emustatus|=2; else emustatus&=~2;
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387 if (PicoWriteSound) PicoWriteSound(curr_pos);
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388 // clear sound buffer
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391 else if (emustatus & 3) {
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394 curr_pos = PsndRender(0, PsndLen/2);
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399 PICO_INTERNAL void PsndGetSamplesMS(void)
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401 int stereo = (PicoOpt & 8) >> 3;
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402 int length = PsndLen;
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404 #if !SIMPLE_WRITE_SOUND
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405 // compensate for float part of PsndLen
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406 PsndLen_exc_cnt += PsndLen_exc_add;
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407 if (PsndLen_exc_cnt >= 0x10000) {
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408 PsndLen_exc_cnt -= 0x10000;
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414 if (PicoOpt & POPT_EN_PSG)
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415 SN76496Update(PsndOut, length, stereo);
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417 // upmix to "stereo" if needed
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420 for (i = length, p = (void *)PsndOut; i > 0; i--, p++)
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424 if (PicoWriteSound != NULL)
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425 PicoWriteSound(length);
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