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38
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1 /*
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2 * SDL_sound -- An abstract sound format decoding API.
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3 * Copyright (C) 2001 Ryan C. Gordon.
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
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19
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20 /*
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21 Attention: This is a stripped down file of SDL_endian for our purposes.
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22 This code is licensed under the LGPL.
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23 This means we must not compile this code into anything that we are not willing to
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24 publicly release source code.
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25 You should compile this into a separate dynamic library that is isolated from proprietary code.
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26 */
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27
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28
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29 #include <stdint.h>
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30 #include "SoundDecoder.h"
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31
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32 uint32_t __Sound_convertMsToBytePos(Sound_AudioInfo *info, uint32_t ms)
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33 {
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34 /* "frames" == "sample frames" */
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35 float frames_per_ms = ((float) info->rate) / 1000.0f;
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36 uint32_t frame_offset = (uint32_t) (frames_per_ms * ((float) ms));
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37 uint32_t frame_size = (uint32_t) ((info->format & 0xFF) / 8) * info->channels;
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38 return(frame_offset * frame_size);
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39 } /* __Sound_convertMsToBytePos */
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40
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41
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