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annotate wave.c @ 505:b7b7a1cab44a

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The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
author Michael Pavone <pavone@retrodev.com>
date Mon, 06 Jan 2014 22:54:05 -0800
parents 140af5509ce7
children 6e9d1a8c1b08
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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) != sizeof(size)) {
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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)) {
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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 }