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annotate wave.c @ 2005:3ce38692a3f2

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Set initial pan bits in YM2612 register array and not just the separate lr field of the channel. This fixes an issue in which some channels would be silent in VGM log output
author Michael Pavone <pavone@retrodev.com>
date Sun, 11 Oct 2020 22:42:10 -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 }