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 #define SIMPLE_WRITE_SOUND 0
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19 void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_stereo;
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21 // master int buffer to mix to
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22 static int PsndBuffer[2*(44100+100)/50];
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25 static unsigned short dac_info[312+4]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
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27 // cdda output buffer
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28 short cdda_out_buffer[2*1152];
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32 int PsndLen=0; // number of mono samples, multiply by 2 for stereo
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33 int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60
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34 int PsndLen_exc_cnt=0;
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36 short *PsndOut=NULL; // PCM data buffer
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39 int timer_a_next_oflow, timer_a_step; // in z80 cycles
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40 int timer_b_next_oflow, timer_b_step;
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43 extern int *sn76496_regs;
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46 static void dac_recalculate(void)
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48 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
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50 if (PsndLen <= lines)
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57 for(i=226; i != 225; i++)
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59 if (i >= lines) i = 0;
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67 dac_info[i] = (pos<<4)|len;
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75 for(i = 225; i != 224; i++)
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77 if (i >= lines) i = 0;
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79 while(dac_cnt >= 0) {
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83 if (i == mid) // midpoint
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84 while(pos+len < PsndLen/2) {
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89 dac_info[i] = (pos<<4)|len;
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93 for(len = 0, i = pos; i < PsndLen; i++) len++;
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94 if (PsndLen_exc_add) len++;
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95 dac_info[224] = (pos<<4)|len;
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97 mid = (dac_info[lines-1] & 0xfff0) + ((dac_info[lines-1] & 0xf) << 4);
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98 for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)
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100 //for(i=len=0; i < lines; i++) {
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101 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);
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102 // len+=dac_info[i]&0xf;
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104 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));
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105 //printf("len total: %i, last pos: %i\n", len, pos);
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110 PICO_INTERNAL void PsndReset(void)
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112 // PsndRerate calls YM2612Init, which also resets
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118 // to be called after changing sound rate or chips
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119 void PsndRerate(int preserve_state)
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121 void *state = NULL;
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122 int target_fps = Pico.m.pal ? 50 : 60;
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124 if (preserve_state) {
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125 state = malloc(0x204);
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126 if (state == NULL) return;
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127 ym2612_pack_state();
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128 memcpy(state, YM2612GetRegs(), 0x204);
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130 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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131 if (preserve_state) {
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132 // feed it back it's own registers, just like after loading state
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133 memcpy(YM2612GetRegs(), state, 0x204);
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134 ym2612_unpack_state();
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137 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
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138 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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139 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
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144 // calculate PsndLen
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145 PsndLen=PsndRate / target_fps;
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146 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;
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149 // recalculate dac info
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152 // clear all buffers
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153 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);
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154 memset(cdda_out_buffer, 0, sizeof(cdda_out_buffer));
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159 PsndMix_32_to_16l = (PicoOpt & POPT_EN_STEREO) ? mix_32_to_16l_stereo : mix_32_to_16_mono;
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161 if (PicoAHW & PAHW_PICO)
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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 PsndDacLine = line_to + 1;
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177 pos =dac_info[line_from]>>4;
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178 pos1=dac_info[line_to];
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179 len = ((pos1>>4)-pos) + (pos1&0xf);
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182 if (PicoOpt & POPT_EN_STEREO) {
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183 short *d = PsndOut + pos*2;
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184 for (; len > 0; len--, d+=2) *d = dout;
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186 short *d = PsndOut + pos;
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187 for (; len > 0; len--, d++) *d = dout;
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192 static void cdda_raw_update(int *buffer, int length)
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194 int ret, cdda_bytes, mult = 1;
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196 cdda_bytes = length*4;
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197 if (PsndRate <= 22050 + 100) mult = 2;
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198 if (PsndRate < 22050 - 100) mult = 4;
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199 cdda_bytes *= mult;
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201 ret = pm_read(cdda_out_buffer, cdda_bytes, Pico_mcd->cdda_stream);
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202 if (ret < cdda_bytes) {
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203 memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);
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204 Pico_mcd->cdda_stream = NULL;
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210 case 1: mix_16h_to_32(buffer, cdda_out_buffer, length*2); break;
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211 case 2: mix_16h_to_32_s1(buffer, cdda_out_buffer, length*2); break;
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212 case 4: mix_16h_to_32_s2(buffer, cdda_out_buffer, length*2); break;
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216 void cdda_start_play(int lba_base, int lba_offset, int lb_len)
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218 if (Pico_mcd->cdda_type == CT_MP3)
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223 pos1024 = lba_offset * 1024 / lb_len;
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225 mp3_start_play(Pico_mcd->cdda_stream, pos1024);
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229 pm_seek(Pico_mcd->cdda_stream, (lba_base + lba_offset) * 2352, SEEK_SET);
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230 if (Pico_mcd->cdda_type == CT_WAV)
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232 // skip headers, assume it's 44kHz stereo uncompressed
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233 pm_seek(Pico_mcd->cdda_stream, 44, SEEK_CUR);
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238 PICO_INTERNAL void PsndClear(void)
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241 if (PsndLen_exc_add) len++;
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242 if (PicoOpt & POPT_EN_STEREO)
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243 memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned
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245 short *out = PsndOut;
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246 if ((long)out & 2) { *out++ = 0; len--; }
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247 memset32((int *) out, 0, len/2);
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248 if (len & 1) out[len-1] = 0;
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253 static int PsndRender(int offset, int length)
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255 int buf32_updated = 0;
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256 int *buf32 = PsndBuffer+offset;
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257 int stereo = (PicoOpt & 8) >> 3;
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261 pprof_start(sound);
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263 #if !SIMPLE_WRITE_SOUND
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264 if (offset == 0) { // should happen once per frame
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265 // compensate for float part of PsndLen
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266 PsndLen_exc_cnt += PsndLen_exc_add;
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267 if (PsndLen_exc_cnt >= 0x10000) {
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268 PsndLen_exc_cnt -= 0x10000;
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275 if (PicoOpt & POPT_EN_PSG)
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276 SN76496Update(PsndOut+offset, length, stereo);
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278 if (PicoAHW & PAHW_PICO) {
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279 PicoPicoPCMUpdate(PsndOut+offset, length, stereo);
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283 // Add in the stereo FM buffer
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284 if (PicoOpt & POPT_EN_FM) {
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285 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);
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287 memset32(buf32, 0, length<<stereo);
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289 //printf("active_chs: %02x\n", buf32_updated);
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290 (void)buf32_updated;
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293 if (PicoAHW & PAHW_MCD) {
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294 pcd_pcm_update(buf32, length, stereo);
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295 //buf32_updated = 1;
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299 // CD mode, cdda enabled, not data track, CDC is reading
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300 if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA)
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301 && Pico_mcd->cdda_stream != NULL
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302 && !(Pico_mcd->s68k_regs[0x36] & 1))
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304 // note: only 44, 22 and 11 kHz supported, with forced stereo
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305 if (Pico_mcd->cdda_type == CT_MP3)
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306 mp3_update(buf32, length, stereo);
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308 cdda_raw_update(buf32, length);
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311 if ((PicoAHW & PAHW_32X) && (PicoOpt & POPT_EN_PWM))
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312 p32x_pwm_update(buf32, length, stereo);
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314 // convert + limit to normal 16bit output
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315 PsndMix_32_to_16l(PsndOut+offset, buf32, length);
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322 // to be called on 224 or line_sample scanlines only
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323 PICO_INTERNAL void PsndGetSamples(int y)
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325 #if SIMPLE_WRITE_SOUND
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326 if (y != 224) return;
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327 PsndRender(0, PsndLen);
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328 if (PicoWriteSound)
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329 PicoWriteSound(PsndLen * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));
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332 static int curr_pos = 0;
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337 curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);
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338 else curr_pos = PsndRender(0, PsndLen);
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341 else emustatus &= ~2;
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342 if (PicoWriteSound)
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343 PicoWriteSound(curr_pos * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));
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344 // clear sound buffer
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347 else if (emustatus & 3) {
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350 curr_pos = PsndRender(0, PsndLen/2);
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355 PICO_INTERNAL void PsndGetSamplesMS(void)
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357 int stereo = (PicoOpt & 8) >> 3;
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358 int length = PsndLen;
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360 #if !SIMPLE_WRITE_SOUND
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361 // compensate for float part of PsndLen
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362 PsndLen_exc_cnt += PsndLen_exc_add;
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363 if (PsndLen_exc_cnt >= 0x10000) {
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364 PsndLen_exc_cnt -= 0x10000;
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370 if (PicoOpt & POPT_EN_PSG)
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371 SN76496Update(PsndOut, length, stereo);
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373 // upmix to "stereo" if needed
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376 for (i = length, p = (void *)PsndOut; i > 0; i--, p++)
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380 if (PicoWriteSound != NULL)
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381 PicoWriteSound(length * ((PicoOpt & POPT_EN_STEREO) ? 4 : 2));
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