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annotate wave.c @ 724:2174f92c5f9b

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Fix bug in vdp_next_hint that was causing HINTs to fire repeatedly when they should not have fired at all based on an HINT interval that was larger than the number of active lines in the display
author Michael Pavone <pavone@retrodev.com>
date Fri, 22 May 2015 18:38:44 -0700
parents 6e9d1a8c1b08
children efc75ea79164
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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 #include "wave.h"
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7 #include <stddef.h>
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8 #include <string.h>
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9
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10 int wave_init(FILE * f, uint32_t sample_rate, uint16_t bits_per_sample, uint16_t num_channels)
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11 {
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12 wave_header header;
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13 memcpy(header.chunk.id, "RIFF", 4);
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14 memcpy(header.chunk.format, "WAVE", 4);
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15 header.chunk.size = 0; //This will be filled in later
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16 memcpy(header.format_header.id, "fmt ", 4);
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17 header.format_header.size = sizeof(wave_header) - (sizeof(header.chunk) + sizeof(header.data_header) + sizeof(header.format_header));
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18 header.audio_format = 1;
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19 header.num_channels = num_channels;
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20 header.sample_rate = sample_rate;
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21 header.byte_rate = sample_rate * num_channels * (bits_per_sample/8);
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22 header.block_align = num_channels * (bits_per_sample/8);
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23 header.bits_per_sample = bits_per_sample;
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24 memcpy(header.data_header.id, "data", 4);
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25 header.data_header.size = 0;//This will be filled in later;
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26 return fwrite(&header, 1, sizeof(header), f) == sizeof(header);
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27 }
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28
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29 int wave_finalize(FILE * f)
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30 {
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31 uint32_t size = ftell(f);
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32 fseek(f, offsetof(wave_header, chunk.size), SEEK_SET);
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33 size -= 8;
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34 if (fwrite(&size, sizeof(size), 1, f) != 1) {
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35 fclose(f);
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36 return 0;
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37 }
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38 fseek(f, offsetof(wave_header, data_header.size), SEEK_SET);
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39 size -= 36;
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40 if (fwrite(&size, sizeof(size), 1, f) != 1) {
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41 fclose(f);
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42 return 0;
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43 }
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44 fclose(f);
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45 return 1;
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46 }