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annotate wave.c @ 1044:1625555e346e

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Properly handle redundant prefixes
author Michael Pavone <pavone@retrodev.com>
date Mon, 25 Jul 2016 23:16:04 -0700
parents 6e9d1a8c1b08
children efc75ea79164
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }