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annotate wave.c @ 1374:8f404b1fa572

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Go back to resetting the refresh counter after a DMA. Probably not quite correct as it is probably reset on VDP triggered refresh, but this is close enough for now given the general limitations with my refresh code. VDP FIFO Testing seems to be passing 100% reliably again (was occassionally failing still with the last commit)
author Michael Pavone <pavone@retrodev.com>
date Tue, 23 May 2017 23:47:40 -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 }