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annotate psg.h @ 838:9a5dc22297f2

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Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
author Michael Pavone <pavone@retrodev.com>
date Thu, 29 Oct 2015 01:06:48 -0700
parents 3e1573fa22cf
children 252dfd29831d
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140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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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 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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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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21 uint16_t lsfr;
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22 uint16_t counter_load[4];
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23 uint16_t counters[4];
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parents: 483
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24 int16_t accum;
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parents: 483
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25 int16_t sample_count;
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26 uint8_t volume[4];
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27 uint8_t output_state[4];
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28 uint8_t noise_out;
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29 uint8_t noise_use_tone;
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30 uint8_t noise_type;
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31 uint8_t latch;
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32 } psg_context;
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33
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34
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parents: 364
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35 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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36 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock);
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37 void psg_write(psg_context * context, uint8_t value);
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38 void psg_run(psg_context * context, uint32_t cycles);
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39
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40 #endif //PSG_CONTEXT_H_
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41