Mercurial > repos > blastem
annotate wave.c @ 922:913a6336ce20
Shift slot number to slot behavior mapping by six slots in H40 mode. This makes the line change slot align with the point at which the display turns on and off at the end of the active display area. Also fixed a regression in which an external slot got accidentally changed into a sprite draw slot
author | Michael Pavone <pavone@retrodev.com> |
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date | Thu, 28 Jan 2016 09:10:14 -0800 |
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 } |