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annotate psg.h @ 974:fd7702bcc034

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FindFirstFile makes more sense for getting modification times of a path than using CreateFile and GetFileTimes
author Michael Pavone <pavone@retrodev.com>
date Fri, 22 Apr 2016 19:18:15 -0700
parents e6dc30231b83
children 8d032a368dd5
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140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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1 /*
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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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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15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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6 #ifndef PSG_CONTEXT_H_
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7 #define PSG_CONTEXT_H_
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8
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9 #include <stdint.h>
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10
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11 typedef struct {
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12 int16_t *audio_buffer;
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13 int16_t *back_buffer;
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14 uint64_t buffer_fraction;
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15 uint64_t buffer_inc;
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16 uint32_t buffer_pos;
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1c8d74f2ab0b Make the PSG and YM2612 use the master clock internal with an increment based on clock divider so that they stay perflectly in sync. Run both the PSG and YM2612 whenver one of them needs to be run.
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17 uint32_t clock_inc;
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18 uint32_t cycles;
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19 uint32_t sample_rate;
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20 uint32_t samples_frame;
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e6dc30231b83 Fix PSG linear resampling and implement a low pass filter
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21 int32_t lowpass_alpha;
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22 uint16_t lsfr;
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23 uint16_t counter_load[4];
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24 uint16_t counters[4];
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25 int16_t accum;
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bd549b25c362 Not so successful attempt at improved PSG resampling
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26 int16_t last_sample;
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27 uint8_t volume[4];
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28 uint8_t output_state[4];
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29 uint8_t noise_out;
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30 uint8_t noise_use_tone;
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31 uint8_t noise_type;
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32 uint8_t latch;
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33 } psg_context;
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parents: 364
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36 void psg_init(psg_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t samples_frame);
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252dfd29831d Selecting a second game from the menu now works
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37 void psg_free(psg_context *context);
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38 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock);
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39 void psg_write(psg_context * context, uint8_t value);
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40 void psg_run(psg_context * context, uint32_t cycles);
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41
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42 #endif //PSG_CONTEXT_H_
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43