mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2025-01-11 18:59:07 +01:00
added experimental resampling (Secret Rabbit Code)
This commit is contained in:
ekeeke31
parent
19cede04f6
commit
8a2d4a03ff
@ -34,7 +34,7 @@ LDFLAGS = -g $(MACHDEP) -Wl,-Map,$(notdir $@).map
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#---------------------------------------------------------------------------------
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# any extra libraries we wish to link with the project
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#---------------------------------------------------------------------------------
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LIBS := -lfat -lwiiuse -lbte -logc -lm -lz
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LIBS := -lfat -lwiiuse -lbte -logc -lm -lz -lsamplerate
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#---------------------------------------------------------------------------------
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# list of directories containing libraries, this must be the top level containing
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@ -120,7 +120,7 @@
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/* globals */
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#define FREQ_SH 16 /* 16.16 fixed point (frequency calculations) */
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#define EG_SH 16 /* 16.16 fixed point (envelope generator timing) */
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#define EG_SH 16 /* 16.16 fixed point (envelope generator timing) */
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#define LFO_SH 24 /* 8.24 fixed point (LFO calculations) */
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#define TIMER_SH 16 /* 16.16 fixed point (timers calculations) */
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@ -146,8 +146,8 @@
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#define TL_RES_LEN (256) /* 8 bits addressing (real chip) */
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#define MAXOUT (+16383)
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#define MINOUT (-16384)
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#define MAXOUT (+32767)
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#define MINOUT (-32768)
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/* TL_TAB_LEN is calculated as:
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@ -550,8 +550,8 @@ typedef struct
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/* local time tables */
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INT32 dt_tab[8][32];/* DeTune table */
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UINT32 Inter_Cnt; // Interpolation Counter
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UINT32 Inter_Step; // Interpolation Step
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// UINT32 Inter_Cnt; // Interpolation Counter
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// UINT32 Inter_Step; // Interpolation Step
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} FM_ST;
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@ -1456,25 +1456,30 @@ static void OPNSetPres(int pres)
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{
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int i;
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/* frequency base */
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ym2612.OPN.ST.freqbase = ((double) ym2612.OPN.ST.clock / (double) ym2612.OPN.ST.rate) / ((double) pres);
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/* timer increment in usecs (timers are incremented after each updated samples) */
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ym2612.OPN.ST.TimerBase = 1000000.0 / (double)ym2612.OPN.ST.rate;
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if (config.hq_fm)
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{
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ym2612.OPN.ST.Inter_Step = (unsigned int) ((1.0 / ym2612.OPN.ST.freqbase) * (double) (0x4000));
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ym2612.OPN.ST.Inter_Cnt = 0;
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ym2612.OPN.ST.freqbase = 1.0;
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}
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else
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{
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ym2612.OPN.ST.Inter_Step = 0x4000;
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ym2612.OPN.ST.Inter_Cnt = 0;
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}
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//ym2612.OPN.ST.Inter_Step = (unsigned int) ((1.0 / ym2612.OPN.ST.freqbase) * (double) (0x4000));
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//ym2612.OPN.ST.Inter_Cnt = 0;
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//ym2612.OPN.ST.freqbase = 1.0;
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ym2612.OPN.ST.rate = ym2612.OPN.ST.clock / pres;
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ym2612.OPN.eg_timer_add = (UINT32)((1<<EG_SH) * ym2612.OPN.ST.freqbase);
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}
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//else
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//{
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//ym2612.OPN.ST.Inter_Step = 0x4000;
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//ym2612.OPN.ST.Inter_Cnt = 0;
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//}
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/* frequency base */
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ym2612.OPN.ST.freqbase = ((double) ym2612.OPN.ST.clock / (double) ym2612.OPN.ST.rate) / ((double) pres);
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/* timer increment in usecs (timers are incremented after each updated samples) */
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ym2612.OPN.ST.TimerBase = 1000000.0 / (double)ym2612.OPN.ST.rate;
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ym2612.OPN.eg_timer_add = (UINT32)((1<<EG_SH) * ym2612.OPN.ST.freqbase);
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//ym2612.OPN.eg_timer_overflow = ( 3 ) * (1<<EG_SH);
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ym2612.OPN.eg_timer_overflow = (351 * (1<<EG_SH)) / 144; /* correct frequency (Nemesis: tested on real HW) */
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@ -1748,7 +1753,7 @@ static void OPNWriteReg(int r, int v)
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/* Generate 32bits samples for ym2612 */
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static long dac;
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int int_cnt; // Interpolation calculation
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//int int_cnt; // Interpolation calculation
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void YM2612UpdateOne(int **buffer, int length)
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{
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@ -1781,7 +1786,7 @@ void YM2612UpdateOne(int **buffer, int length)
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refresh_fc_eg_chan(&ym2612.CH[4]);
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refresh_fc_eg_chan(&ym2612.CH[5]);
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int_cnt = ym2612.OPN.ST.Inter_Cnt;
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//int_cnt = ym2612.OPN.ST.Inter_Cnt;
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/* buffering */
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for(i=0; i < length ; i++)
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@ -1829,6 +1834,7 @@ void YM2612UpdateOne(int **buffer, int length)
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}
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else chan_calc(&ym2612.CH[5]);
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#if 0
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if (config.hq_fm)
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{
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if ((int_cnt += ym2612.OPN.ST.Inter_Step) & 0x04000)
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@ -1875,6 +1881,7 @@ void YM2612UpdateOne(int **buffer, int length)
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old_out_fm[5] = out_fm[5];
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}
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else
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#endif
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{
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lt = ((out_fm[0]>>0) & ym2612.OPN.pan[0]);
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rt = ((out_fm[0]>>0) & ym2612.OPN.pan[1]);
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@ -1904,7 +1911,7 @@ void YM2612UpdateOne(int **buffer, int length)
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INTERNAL_TIMER_B(length);
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ym2612.OPN.ST.Inter_Cnt = int_cnt;
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//ym2612.OPN.ST.Inter_Cnt = int_cnt;
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}
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@ -22,6 +22,7 @@
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****************************************************************************************/
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#include "shared.h"
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#include "samplerate.h"
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/* generic functions */
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int (*_YM2612_Write)(unsigned char adr, unsigned char data);
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@ -29,19 +30,32 @@ int (*_YM2612_Read)(void);
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void (*_YM2612_Update)(int **buf, int length);
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int (*_YM2612_Reset)(void);
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static double m68cycles_per_sample;
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static double z80cycles_per_sample;
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static double m68cycles_per_sample[2];
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static double z80cycles_per_sample[2];
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static float fm_buffer_48kHz[960*2];
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static float fm_buffer_53kHz[1060*2];
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static int fm_buffer[2][1060];
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static SRC_DATA data;
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/* YM2612 data */
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int fm_reg[2][0x100]; /* Register arrays (2x256) */
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int fm_reg[2][0x100]; /* Register arrays (2x256) */
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double fm_timera_tab[0x400]; /* Precalculated timer A values (in usecs) */
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double fm_timerb_tab[0x100]; /* Precalculated timer B values (in usecs) */
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/* return the number of samples that should have been rendered so far */
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static inline uint32 sound_sample_cnt(uint8 is_z80)
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static inline uint32 fm_sample_cnt(uint8 is_z80)
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{
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if (is_z80) return (uint32) ((double)(count_z80 + current_z80 - z80_ICount) / z80cycles_per_sample);
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else return (uint32) ((double) count_m68k / m68cycles_per_sample);
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if (is_z80) return (uint32) ((double)(count_z80 + current_z80 - z80_ICount) / z80cycles_per_sample[0]);
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else return (uint32) ((double) count_m68k / m68cycles_per_sample[0]);
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}
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static inline uint32 psg_sample_cnt(uint8 is_z80)
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{
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if (is_z80) return (uint32) ((double)(count_z80 + current_z80 - z80_ICount) / z80cycles_per_sample[1]);
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else return (uint32) ((double) count_m68k / m68cycles_per_sample[1]);
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}
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/* update FM samples */
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@ -49,10 +63,19 @@ static inline void fm_update()
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{
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if(snd.fm.curStage - snd.fm.lastStage > 1)
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{
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//error("%d(%d): FM update (%d) %d from %d samples (%08x)\n", v_counter, count_z80 + current_z80 - z80_ICount, cpu, snd.fm.curStage , snd.fm.lastStage, m68k_get_reg (NULL, M68K_REG_PC));
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int *tempBuffer[2];
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tempBuffer[0] = snd.fm.buffer[0] + snd.fm.lastStage;
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tempBuffer[1] = snd.fm.buffer[1] + snd.fm.lastStage;
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int *tempBuffer[2];
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if (config.hq_fm && !config.fm_core)
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{
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tempBuffer[0] = fm_buffer[0] + snd.fm.lastStage;
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tempBuffer[1] = fm_buffer[1] + snd.fm.lastStage;
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}
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else
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{
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tempBuffer[0] = snd.fm.buffer[0] + snd.fm.lastStage;
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tempBuffer[1] = snd.fm.buffer[1] + snd.fm.lastStage;
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}
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_YM2612_Update(tempBuffer, snd.fm.curStage - snd.fm.lastStage);
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snd.fm.lastStage = snd.fm.curStage;
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}
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@ -83,9 +106,28 @@ void sound_init(int rate)
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/* Formula is "time(us) = 16 * (256 - B) * 144 * 1000000 / clock" */
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for(i = 0; i < 256; i += 1) fm_timerb_tab[i] = ((double)((256 - i) * 16 * 144) * 1000000.0 / vclk);
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/* Cycle-Accurate sample generation */
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m68cycles_per_sample = ((double)m68cycles_per_line * (double)lines_per_frame) / (double) (rate / vdp_rate);
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z80cycles_per_sample = ((double)z80cycles_per_line * (double)lines_per_frame) / (double) (rate / vdp_rate);
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/* cycle-accurate FM samples */
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if (config.hq_fm && !config.fm_core)
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{
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m68cycles_per_sample[0] = 144;
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z80cycles_per_sample[0] = (144 * 7) / 15;
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/* set samplerate converter data */
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data.data_in = fm_buffer_53kHz;
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data.data_out = fm_buffer_48kHz;
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data.input_frames = vdp_pal ? 1060 : 888;
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data.output_frames = vdp_pal ? 960 : 800;
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data.src_ratio = 48000.0 / (vdp_pal ? 52781.0 : 53267.0);
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}
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else
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{
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m68cycles_per_sample[0] = ((double)m68cycles_per_line * (double)lines_per_frame) / (double) (rate / vdp_rate);
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z80cycles_per_sample[0] = ((double)z80cycles_per_line * (double)lines_per_frame) / (double) (rate / vdp_rate);
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}
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/* cycle-accurate PSG samples */
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m68cycles_per_sample[1] = ((double)m68cycles_per_line * (double)lines_per_frame) / (double) (rate / vdp_rate);
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z80cycles_per_sample[1] = ((double)z80cycles_per_line * (double)lines_per_frame) / (double) (rate / vdp_rate);
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/* initialize sound chips */
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SN76489_Init(0, (int)zclk, rate);
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@ -119,7 +161,59 @@ void sound_update(void)
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fm_update();
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psg_update();
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/* reset samples count */
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/* Resampling */
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if (config.hq_fm && !config.fm_core)
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{
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double scaled_value ;
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int len = vdp_pal ? 1060 : 888;
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/* this is basically libsamplerate "src_int_to_float_array" function, adapted to interlace samples */
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while (len)
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{
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len -- ;
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fm_buffer_53kHz [len*2] = (float) (fm_buffer[0] [len] / (8.0 * 0x10000000)) ;
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fm_buffer_53kHz [len*2 + 1] = (float) (fm_buffer[1] [len] / (8.0 * 0x10000000)) ;
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}
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/* samplerate conversion */
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src_simple (&data, SRC_SINC_FASTEST, 2);
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/* this is basically libsamplerate "src_float_to_int_array" function, adapted to interlace samples */
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len = vdp_pal ? 960 : 800;
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while (len)
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{
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len -- ;
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scaled_value = fm_buffer_48kHz [len*2] * (8.0 * 0x10000000);
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if (scaled_value >= (1.0 * 0x7FFFFFFF))
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{
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snd.fm.buffer[0][len] = 0x7fffffff;
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}
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else if (scaled_value <= (-8.0 * 0x10000000))
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{
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snd.fm.buffer[0][len] = -1 - 0x7fffffff;
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}
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else
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{
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snd.fm.buffer[0][len] = (long)scaled_value;
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}
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scaled_value = fm_buffer_48kHz [len*2+1] * (8.0 * 0x10000000);
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if (scaled_value >= (1.0 * 0x7FFFFFFF))
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{
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snd.fm.buffer[1][len] = 0x7fffffff;
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}
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else if (scaled_value <= (-8.0 * 0x10000000))
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{
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snd.fm.buffer[1][len] = -1 - 0x7fffffff;
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}
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else
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{
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snd.fm.buffer[1][len] = (long)scaled_value;
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}
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}
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}
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/* reset samples count */
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snd.fm.curStage = 0;
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snd.fm.lastStage = 0;
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snd.psg.curStage = 0;
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@ -147,7 +241,7 @@ void fm_restore(void)
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/* write FM chip */
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void fm_write(unsigned int cpu, unsigned int address, unsigned int data)
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{
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snd.fm.curStage = sound_sample_cnt(cpu);
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snd.fm.curStage = fm_sample_cnt(cpu);
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fm_update();
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_YM2612_Write(address & 3, data);
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}
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@ -155,7 +249,7 @@ void fm_write(unsigned int cpu, unsigned int address, unsigned int data)
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/* read FM status */
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unsigned int fm_read(unsigned int cpu, unsigned int address)
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{
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snd.fm.curStage = sound_sample_cnt(cpu);
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snd.fm.curStage = fm_sample_cnt(cpu);
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fm_update();
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return (_YM2612_Read() & 0xff);
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}
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@ -164,7 +258,7 @@ unsigned int fm_read(unsigned int cpu, unsigned int address)
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/* PSG write */
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void psg_write(unsigned int cpu, unsigned int data)
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{
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snd.psg.curStage = sound_sample_cnt(cpu);
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snd.psg.curStage = psg_sample_cnt(cpu);
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psg_update();
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SN76489_Write(0, data);
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}
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@ -280,15 +280,15 @@ INLINE void CALC_FINC_SL(slot_ *SL, int finc, int kc)
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SL->Finc = (finc + SL->DT[kc]) * SL->MUL;
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/* YM2612 Detune Bug (discovered by Nemesis) */
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if (SL->Finc < 0)
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{
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/* Phase overflow (best result with BLOCK = 5) */
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finc = (int)((double)FINC_TAB[0x7FF] / YM2612.Frequence) >> 2;
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SL->Finc = (finc + SL->DT[kc]) * SL->MUL;
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}
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/* YM2612 Detune Bug (discovered by Nemesis) */
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if (SL->Finc < 0)
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{
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/* Phase overflow (best result with BLOCK = 5) */
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finc = (int)((double)FINC_TAB[0x7FF] / YM2612.Frequence) >> 2;
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SL->Finc = (finc + SL->DT[kc]) * SL->MUL;
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}
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ksr = kc >> SL->KSR_S; // keycode atténuation
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ksr = kc >> SL->KSR_S; // keycode atténuation
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#if YM_DEBUG_LEVEL > 1
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fprintf(debug_file, "FINC = %d SL->Finc = %d\n", finc, SL->Finc);
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@ -575,7 +575,7 @@ int CHANNEL_SET(int Adr, unsigned char data)
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CH->FOCT[0] = (data & 0x38) >> 3;
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CH->KC[0] = (CH->FOCT[0] << 2) | FKEY_TAB[CH->FNUM[0] >> 7];
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//CH->SLOT[0].Finc = -1;
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CH->SLOT[0].Finc = -1;
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#if YM_DEBUG_LEVEL > 1
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fprintf(debug_file, "CHANNEL[%d] part2 FNUM = %d FOCT = %d KC = %d\n", num, CH->FNUM[0], CH->FOCT[0], CH->KC[0]);
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@ -611,7 +611,7 @@ int CHANNEL_SET(int Adr, unsigned char data)
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YM2612.CHANNEL[2].FOCT[num] = (data & 0x38) >> 3;
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YM2612.CHANNEL[2].KC[num] = (YM2612.CHANNEL[2].FOCT[num] << 2) | FKEY_TAB[YM2612.CHANNEL[2].FNUM[num] >> 7];
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//YM2612.CHANNEL[2].SLOT[0].Finc = -1;
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YM2612.CHANNEL[2].SLOT[0].Finc = -1;
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#if YM_DEBUG_LEVEL > 1
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fprintf(debug_file, "CHANNEL[2] part2 FNUM[%d] = %d FOCT[%d] = %d KC[%d] = %d\n", num, YM2612.CHANNEL[2].FNUM[num], num, YM2612.CHANNEL[2].FOCT[num], num, YM2612.CHANNEL[2].KC[num]);
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