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annotate src/audio/SDL_wave.h @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
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children 6abc7e6f9817
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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3692456e7b0f Use SDL_ prefixed versions of C library functions.
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5 This library is SDL_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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* WAVE files are little-endian */
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25
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26 /*******************************************/
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27 /* Define values for Microsoft WAVE format */
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28 /*******************************************/
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29 #define RIFF 0x46464952 /* "RIFF" */
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30 #define WAVE 0x45564157 /* "WAVE" */
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31 #define FACT 0x74636166 /* "fact" */
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32 #define LIST 0x5453494c /* "LIST" */
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33 #define FMT 0x20746D66 /* "fmt " */
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34 #define DATA 0x61746164 /* "data" */
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35 #define PCM_CODE 0x0001
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36 #define MS_ADPCM_CODE 0x0002
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37 #define IMA_ADPCM_CODE 0x0011
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38 #define MP3_CODE 0x0055
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39 #define WAVE_MONO 1
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40 #define WAVE_STEREO 2
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41
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42 /* Normally, these three chunks come consecutively in a WAVE file */
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43 typedef struct WaveFMT
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44 {
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45 /* Not saved in the chunk we read:
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46 Uint32 FMTchunk;
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47 Uint32 fmtlen;
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48 */
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49 Uint16 encoding;
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50 Uint16 channels; /* 1 = mono, 2 = stereo */
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51 Uint32 frequency; /* One of 11025, 22050, or 44100 Hz */
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52 Uint32 byterate; /* Average bytes per second */
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53 Uint16 blockalign; /* Bytes per sample block */
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54 Uint16 bitspersample; /* One of 8, 12, 16, or 4 for ADPCM */
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55 } WaveFMT;
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56
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57 /* The general chunk found in the WAVE file */
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58 typedef struct Chunk
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59 {
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60 Uint32 magic;
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61 Uint32 length;
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62 Uint8 *data;
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63 } Chunk;
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64 /* vi: set ts=4 sw=4 expandtab: */