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annotate src/audio/SDL_wave.h @ 2938:2929ed239d2a

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Adjusted default choice of audio driver. If a driver can definitely see available devices, it is chosen. Otherwise, we'll take the first driver that initializes but saw no devices...this might be because it can't enumerate them, or there really aren't any available. This prevents the dsp driver from hogging control when there are no /dev/dsp* nodes (for example, on a Linux box with ALSA and no OSS emulation).
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:54:58 +0000
parents 99210400e8b9
children f7b03b6838cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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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 IEEE_FLOAT_CODE 0x0003
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38 #define IMA_ADPCM_CODE 0x0011
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39 #define MP3_CODE 0x0055
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40 #define WAVE_MONO 1
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41 #define WAVE_STEREO 2
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42
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43 /* Normally, these three chunks come consecutively in a WAVE file */
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44 typedef struct WaveFMT
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45 {
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46 /* Not saved in the chunk we read:
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47 Uint32 FMTchunk;
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48 Uint32 fmtlen;
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49 */
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50 Uint16 encoding;
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51 Uint16 channels; /* 1 = mono, 2 = stereo */
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52 Uint32 frequency; /* One of 11025, 22050, or 44100 Hz */
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53 Uint32 byterate; /* Average bytes per second */
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54 Uint16 blockalign; /* Bytes per sample block */
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55 Uint16 bitspersample; /* One of 8, 12, 16, or 4 for ADPCM */
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56 } WaveFMT;
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57
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58 /* The general chunk found in the WAVE file */
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59 typedef struct Chunk
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60 {
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61 Uint32 magic;
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62 Uint32 length;
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63 Uint8 *data;
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64 } Chunk;
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65 /* vi: set ts=4 sw=4 expandtab: */