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annotate wave.c @ 407:c3abc4ada43d

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Add support for logging YM2612 channels to WAVE files
author Mike Pavone <pavone@retrodev.com>
date Sun, 16 Jun 2013 17:57:57 -0700
parents
children 140af5509ce7
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407
c3abc4ada43d Add support for logging YM2612 channels to WAVE files
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1 #include "wave.h"
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2 #include <stddef.h>
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3 #include <string.h>
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4
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5 int wave_init(FILE * f, uint32_t sample_rate, uint16_t bits_per_sample, uint16_t num_channels)
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6 {
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7 wave_header header;
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8 memcpy(header.chunk.id, "RIFF", 4);
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9 memcpy(header.chunk.format, "WAVE", 4);
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10 header.chunk.size = 0; //This will be filled in later
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11 memcpy(header.format_header.id, "fmt ", 4);
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12 header.format_header.size = sizeof(wave_header) - (sizeof(header.chunk) + sizeof(header.data_header) + sizeof(header.format_header));
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13 header.audio_format = 1;
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14 header.num_channels = num_channels;
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15 header.sample_rate = sample_rate;
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16 header.byte_rate = sample_rate * num_channels * (bits_per_sample/8);
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17 header.block_align = num_channels * (bits_per_sample/8);
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18 header.bits_per_sample = bits_per_sample;
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19 memcpy(header.data_header.id, "data", 4);
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20 header.data_header.size = 0;//This will be filled in later;
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21 return fwrite(&header, 1, sizeof(header), f) == sizeof(header);
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22 }
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23
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24 int wave_finalize(FILE * f)
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25 {
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26 uint32_t size = ftell(f);
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27 fseek(f, offsetof(wave_header, chunk.size), SEEK_SET);
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28 size -= 8;
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29 if (fwrite(&size, sizeof(size), 1, f) != sizeof(size)) {
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30 fclose(f);
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31 return 0;
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32 }
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33 fseek(f, offsetof(wave_header, data_header.size), SEEK_SET);
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34 size -= 36;
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35 if (fwrite(&size, sizeof(size), 1, f)) {
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36 fclose(f);
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37 return 0;
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38 }
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39 fclose(f);
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40 return 1;
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41 }