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annotate ym2612.h @ 1996:e35b00626b3e

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Update cycle to VGM sample conversion based on ValleyBell's suggestion
author Michael Pavone <pavone@retrodev.com>
date Thu, 18 Jun 2020 00:28:53 -0700
parents 508522f08e4d
children 0d1d5dccdd28
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #ifndef YM2612_H_
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7 #define YM2612_H_
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8
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9 #include <stdint.h>
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10 #include <stdio.h>
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11 #include "serialize.h"
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12 #include "render_audio.h"
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13 #include "vgm.h"
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14
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15 #define NUM_PART_REGS (0xB7-0x30)
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16 #define NUM_CHANNELS 6
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17 #define NUM_OPERATORS (4*NUM_CHANNELS)
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18
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19 #define YM_OPT_WAVE_LOG 1
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20 #define YM_OPT_3834 2
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21
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22 typedef struct {
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23 int16_t *mod_src[2];
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24 uint32_t phase_counter;
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25 uint32_t phase_inc;
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26 uint16_t envelope;
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27 int16_t output;
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28 uint16_t total_level;
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29 uint16_t sustain_level;
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30 uint8_t rates[4];
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31 uint8_t key_scaling;
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32 uint8_t multiple;
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33 uint8_t detune;
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34 uint8_t am;
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35 uint8_t env_phase;
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36 uint8_t ssg;
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37 uint8_t inverted;
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38 } ym_operator;
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39
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40 typedef struct {
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41 FILE * logfile;
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42 uint16_t fnum;
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43 int16_t output;
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44 int16_t op1_old;
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45 int16_t op2_old;
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46 uint8_t block_fnum_latch;
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47 uint8_t block;
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48 uint8_t keycode;
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49 uint8_t algorithm;
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50 uint8_t feedback;
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51 uint8_t ams;
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52 uint8_t pms;
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53 uint8_t lr;
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54 uint8_t keyon;
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55 } ym_channel;
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56
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57 typedef struct {
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58 uint16_t fnum;
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59 uint8_t block;
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60 uint8_t block_fnum_latch;
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61 uint8_t keycode;
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62 } ym_supp;
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63
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64 #define YM_PART1_START 0x21
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65 #define YM_PART2_START 0x30
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66 #define YM_REG_END 0xB8
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67 #define YM_PART1_REGS (YM_REG_END-YM_PART1_START)
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68 #define YM_PART2_REGS (YM_REG_END-YM_PART2_START)
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69
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70 typedef struct {
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71 audio_source *audio;
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72 vgm_writer *vgm;
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73 uint32_t clock_inc;
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74 uint32_t current_cycle;
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75 uint32_t write_cycle;
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76 uint32_t busy_start;
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77 uint32_t busy_cycles;
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78 uint32_t last_status_cycle;
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79 uint32_t invalid_status_decay;
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80 uint32_t status_address_mask;
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81 int32_t volume_mult;
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82 int32_t volume_div;
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83 ym_operator operators[NUM_OPERATORS];
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84 ym_channel channels[NUM_CHANNELS];
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85 int16_t zero_offset;
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86 uint16_t timer_a;
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87 uint16_t timer_a_load;
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88 uint16_t env_counter;
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89 ym_supp ch3_supp[3];
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90 uint8_t timer_b;
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91 uint8_t sub_timer_b;
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92 uint8_t timer_b_load;
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93 uint8_t ch3_mode;
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94 uint8_t current_op;
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95 uint8_t current_env_op;
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96
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97 uint8_t timer_control;
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98 uint8_t dac_enable;
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99 uint8_t lfo_enable;
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100 uint8_t lfo_freq;
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101 uint8_t lfo_counter;
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102 uint8_t lfo_am_step;
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103 uint8_t lfo_pm_step;
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104 uint8_t csm_keyon;
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105 uint8_t status;
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106 uint8_t last_status;
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107 uint8_t selected_reg;
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108 uint8_t selected_part;
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109 uint8_t part1_regs[YM_PART1_REGS];
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110 uint8_t part2_regs[YM_PART2_REGS];
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111 } ym2612_context;
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112
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113 enum {
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114 REG_LFO = 0x22,
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115 REG_TIMERA_HIGH = 0x24,
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116 REG_TIMERA_LOW,
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117 REG_TIMERB,
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118 REG_TIME_CTRL,
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119 REG_KEY_ONOFF,
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120 REG_DAC = 0x2A,
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121 REG_DAC_ENABLE,
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122
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123 REG_DETUNE_MULT = 0x30,
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124 REG_TOTAL_LEVEL = 0x40,
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125 REG_ATTACK_KS = 0x50,
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126 REG_DECAY_AM = 0x60,
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127 REG_SUSTAIN_RATE = 0x70,
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128 REG_S_LVL_R_RATE = 0x80,
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129 REG_SSG_EG = 0x90,
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130
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131 REG_FNUM_LOW = 0xA0,
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132 REG_BLOCK_FNUM_H = 0xA4,
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133 REG_FNUM_LOW_CH3 = 0xA8,
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134 REG_BLOCK_FN_CH3 = 0xAC,
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135 REG_ALG_FEEDBACK = 0xB0,
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136 REG_LR_AMS_PMS = 0xB4
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137 };
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138
1555
6ce36c3f250b More audio refactoring in preparation for allowing proper sync to video with dynamic audio rate control
Michael Pavone <pavone@retrodev.com>
parents: 1551
diff changeset
139 void ym_init(ym2612_context * context, uint32_t master_clock, uint32_t clock_div, uint32_t options);
1308
1b3fe6e03e7b Reset YM2612 whenver the Z80 is reset. Fixes issue with stuck notes in Fantastic Dizzy and Kid Chameleon
Michael Pavone <pavone@retrodev.com>
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140 void ym_reset(ym2612_context *context);
884
252dfd29831d Selecting a second game from the menu now works
Michael Pavone <pavone@retrodev.com>
parents: 848
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141 void ym_free(ym2612_context *context);
1798
5278b6e44fc1 Optionally emulate the offset around zero in the imperfect DAC of a discrete YM2612
Michael Pavone <pavone@retrodev.com>
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142 void ym_enable_zero_offset(ym2612_context *context, uint8_t enabled);
483
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
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143 void ym_adjust_master_clock(ym2612_context * context, uint32_t master_clock);
1902
32a3aa7b4a45 Fix YM2612 busy flag timing
Michael Pavone <pavone@retrodev.com>
parents: 1880
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144 void ym_adjust_cycles(ym2612_context *context, uint32_t deduction);
288
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145 void ym_run(ym2612_context * context, uint32_t to_cycle);
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146 void ym_address_write_part1(ym2612_context * context, uint8_t address);
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147 void ym_address_write_part2(ym2612_context * context, uint8_t address);
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148 void ym_data_write(ym2612_context * context, uint8_t value);
1909
508522f08e4d Initial stab at VGM logging support
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parents: 1904
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149 void ym_vgm_log(ym2612_context *context, uint32_t master_clock, vgm_writer *vgm);
1904
8312e574100a Implement selectable YM2612/YM3834 invalid status port behavior
Michael Pavone <pavone@retrodev.com>
parents: 1902
diff changeset
150 uint8_t ym_read_status(ym2612_context * context, uint32_t cycle, uint32_t port);
424
7e8e179116af Add support for loading GST format savestates
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parents: 411
diff changeset
151 uint8_t ym_load_gst(ym2612_context * context, FILE * gstfile);
451
b7c3b2d22858 Added support for saving savestates. Added gst savestate format test harness
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parents: 424
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152 uint8_t ym_save_gst(ym2612_context * context, FILE * gstfile);
739
2317bdca03b4 Add a basic YM-2612 command to the debugger. Fix negative detune values and get the correct precision for the multiplication step of phase inc calculation
Michael Pavone <pavone@retrodev.com>
parents: 535
diff changeset
153 void ym_print_channel_info(ym2612_context *context, int channel);
930
f33e8d88ab6f Add yt debug command for printing YM-2612 timer info. Fix AMS shift values.
Michael Pavone <pavone@retrodev.com>
parents: 884
diff changeset
154 void ym_print_timer_info(ym2612_context *context);
1427
4e5797b3935a WIP - New savestate format
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parents: 1308
diff changeset
155 void ym_serialize(ym2612_context *context, serialize_buffer *buf);
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parents: 1308
diff changeset
156 void ym_deserialize(deserialize_buffer *buf, void *vcontext);
288
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157
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158 #endif //YM2612_H_
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159