3 * (c) Copyright Dave, 2004
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4 * (C) notaz, 2006-2009
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6 * This work is licensed under the terms of MAME license.
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7 * See COPYING file in the top-level directory.
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12 #include "sn76496.h"
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13 #include "../pico_int.h"
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14 #include "../cd/cue.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]; // pos in sample buffer
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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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35 static int PsndLen_use;
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38 int timer_a_next_oflow, timer_a_step; // in z80 cycles
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39 int timer_b_next_oflow, timer_b_step;
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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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56 for(i=226; i != 225; i++)
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58 if (i >= lines) i = 0;
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72 for(i = 225; i != 224; i++)
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74 if (i >= lines) i = 0;
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76 while(dac_cnt >= 0) {
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80 if (i == mid) // midpoint
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81 while(pos+len < PsndLen/2) {
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90 for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)
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91 dac_info[i] = dac_info[0];
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95 PICO_INTERNAL void PsndReset(void)
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97 // PsndRerate calls YM2612Init, which also resets
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103 // to be called after changing sound rate or chips
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104 void PsndRerate(int preserve_state)
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106 void *state = NULL;
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107 int target_fps = Pico.m.pal ? 50 : 60;
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109 if (preserve_state) {
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110 state = malloc(0x204);
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111 if (state == NULL) return;
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112 ym2612_pack_state();
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113 memcpy(state, YM2612GetRegs(), 0x204);
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115 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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116 if (preserve_state) {
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117 // feed it back it's own registers, just like after loading state
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118 memcpy(YM2612GetRegs(), state, 0x204);
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119 ym2612_unpack_state();
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122 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
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123 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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124 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
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129 // calculate PsndLen
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130 PsndLen=PsndRate / target_fps;
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131 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;
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134 // recalculate dac info
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137 // clear all buffers
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138 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);
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139 memset(cdda_out_buffer, 0, sizeof(cdda_out_buffer));
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144 PsndMix_32_to_16l = (PicoOpt & POPT_EN_STEREO) ? mix_32_to_16l_stereo : mix_32_to_16_mono;
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146 if (PicoAHW & PAHW_PICO)
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151 PICO_INTERNAL void PsndStartFrame(void)
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153 // compensate for float part of PsndLen
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154 PsndLen_use = PsndLen;
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155 PsndLen_exc_cnt += PsndLen_exc_add;
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156 if (PsndLen_exc_cnt >= 0x10000) {
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157 PsndLen_exc_cnt -= 0x10000;
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163 dac_info[224] = PsndLen_use;
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166 PICO_INTERNAL void PsndDoDAC(int line_to)
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168 int pos, pos1, len;
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169 int dout = ym2612.dacout;
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170 int line_from = PsndDacLine;
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172 if (line_to >= 312)
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175 pos = dac_info[line_from];
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176 pos1 = dac_info[line_to + 1];
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181 PsndDacLine = line_to + 1;
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186 if (PicoOpt & POPT_EN_STEREO) {
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187 short *d = PsndOut + pos*2;
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188 for (; len > 0; len--, d+=2) *d = dout;
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190 short *d = PsndOut + pos;
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191 for (; len > 0; len--, d++) *d = dout;
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196 static void cdda_raw_update(int *buffer, int length)
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198 int ret, cdda_bytes, mult = 1;
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200 cdda_bytes = length*4;
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201 if (PsndRate <= 22050 + 100) mult = 2;
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202 if (PsndRate < 22050 - 100) mult = 4;
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203 cdda_bytes *= mult;
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205 ret = pm_read(cdda_out_buffer, cdda_bytes, Pico_mcd->cdda_stream);
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206 if (ret < cdda_bytes) {
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207 memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);
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208 Pico_mcd->cdda_stream = NULL;
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214 case 1: mix_16h_to_32(buffer, cdda_out_buffer, length*2); break;
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215 case 2: mix_16h_to_32_s1(buffer, cdda_out_buffer, length*2); break;
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216 case 4: mix_16h_to_32_s2(buffer, cdda_out_buffer, length*2); break;
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220 void cdda_start_play(int lba_base, int lba_offset, int lb_len)
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222 if (Pico_mcd->cdda_type == CT_MP3)
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227 pos1024 = lba_offset * 1024 / lb_len;
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229 mp3_start_play(Pico_mcd->cdda_stream, pos1024);
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233 pm_seek(Pico_mcd->cdda_stream, (lba_base + lba_offset) * 2352, SEEK_SET);
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234 if (Pico_mcd->cdda_type == CT_WAV)
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236 // skip headers, assume it's 44kHz stereo uncompressed
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237 pm_seek(Pico_mcd->cdda_stream, 44, SEEK_CUR);
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242 PICO_INTERNAL void PsndClear(void)
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245 if (PsndLen_exc_add) len++;
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246 if (PicoOpt & POPT_EN_STEREO)
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247 memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned
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249 short *out = PsndOut;
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250 if ((long)out & 2) { *out++ = 0; len--; }
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251 memset32((int *) out, 0, len/2);
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252 if (len & 1) out[len-1] = 0;
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257 static int PsndRender(int offset, int length)
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259 int buf32_updated = 0;
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260 int *buf32 = PsndBuffer+offset;
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261 int stereo = (PicoOpt & 8) >> 3;
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265 pprof_start(sound);
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268 if (PicoOpt & POPT_EN_PSG)
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269 SN76496Update(PsndOut+offset, length, stereo);
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271 if (PicoAHW & PAHW_PICO) {
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272 PicoPicoPCMUpdate(PsndOut+offset, length, stereo);
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276 // Add in the stereo FM buffer
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277 if (PicoOpt & POPT_EN_FM) {
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278 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);
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280 memset32(buf32, 0, length<<stereo);
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282 //printf("active_chs: %02x\n", buf32_updated);
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283 (void)buf32_updated;
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286 if (PicoAHW & PAHW_MCD) {
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287 pcd_pcm_update(buf32, length, stereo);
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288 //buf32_updated = 1;
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292 // CD mode, cdda enabled, not data track, CDC is reading
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293 if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA)
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294 && Pico_mcd->cdda_stream != NULL
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295 && !(Pico_mcd->s68k_regs[0x36] & 1))
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297 // note: only 44, 22 and 11 kHz supported, with forced stereo
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298 if (Pico_mcd->cdda_type == CT_MP3)
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299 mp3_update(buf32, length, stereo);
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301 cdda_raw_update(buf32, length);
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304 if ((PicoAHW & PAHW_32X) && (PicoOpt & POPT_EN_PWM))
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305 p32x_pwm_update(buf32, length, stereo);
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307 // convert + limit to normal 16bit output
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308 PsndMix_32_to_16l(PsndOut+offset, buf32, length);
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315 // to be called on 224 or line_sample scanlines only
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316 PICO_INTERNAL void PsndGetSamples(int y)
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318 static int curr_pos = 0;
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320 if (ym2612.dacen && PsndDacLine < y)
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326 curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);
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327 else curr_pos = PsndRender(0, PsndLen_use);
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330 else emustatus &= ~2;
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331 if (PicoWriteSound)
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332 PicoWriteSound(curr_pos * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));
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333 // clear sound buffer
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338 else if (emustatus & 3) {
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341 curr_pos = PsndRender(0, PsndLen/2);
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345 PICO_INTERNAL void PsndGetSamplesMS(void)
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347 int stereo = (PicoOpt & 8) >> 3;
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348 int length = PsndLen_use;
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351 if (PicoOpt & POPT_EN_PSG)
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352 SN76496Update(PsndOut, length, stereo);
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354 // upmix to "stereo" if needed
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357 for (i = length, p = (void *)PsndOut; i > 0; i--, p++)
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361 if (PicoWriteSound != NULL)
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362 PicoWriteSound(length * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));
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366 // vim:shiftwidth=2:ts=2:expandtab
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