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annotate decoders/wav.c @ 166:d8904267d23c

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Cleanups, fixes and enhancements by Torbj�rn Andersson.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 26 Nov 2001 04:32:55 +0000
parents 1df5c106504e
children bdbe09014724
rev   line source
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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 * WAV decoder for SDL_sound.
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22 *
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23 * This driver handles Microsoft .WAVs, in as many of the thousands of
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24 * variations as we can.
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25 *
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26 * Please see the file LICENSE in the source's root directory.
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27 *
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28 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
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29 */
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30
106
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31 #if HAVE_CONFIG_H
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32 # include <config.h>
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33 #endif
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34
104
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35 #ifdef SOUND_SUPPORTS_WAV
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36
17
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37 #include <stdio.h>
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38 #include <stdlib.h>
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39 #include <string.h>
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40 #include <assert.h>
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41
106
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42 #include "SDL_sound.h"
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43
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44 #define __SDL_SOUND_INTERNAL__
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45 #include "SDL_sound_internal.h"
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46
47
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47 static int WAV_init(void);
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48 static void WAV_quit(void);
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49 static int WAV_open(Sound_Sample *sample, const char *ext);
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50 static void WAV_close(Sound_Sample *sample);
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51 static Uint32 WAV_read(Sound_Sample *sample);
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52
149
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53 static const char *extensions_wav[] = { "WAV", NULL };
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54 const Sound_DecoderFunctions __Sound_DecoderFunctions_WAV =
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55 {
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56 {
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57 extensions_wav,
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58 "Microsoft WAVE audio format",
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59 "Ryan C. Gordon <icculus@clutteredmind.org>",
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60 "http://www.icculus.org/SDL_sound/"
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61 },
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62
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63 WAV_init, /* init() method */
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64 WAV_quit, /* quit() method */
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65 WAV_open, /* open() method */
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66 WAV_close, /* close() method */
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67 WAV_read /* read() method */
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68 };
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69
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70 static int WAV_init(void)
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71 {
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72 return(1); /* always succeeds. */
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73 } /* WAV_init */
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74
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75
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76 static void WAV_quit(void)
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77 {
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78 /* it's a no-op. */
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79 } /* WAV_quit */
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80
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124
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82
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83 /* Chunk management code... */
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84
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85 #define riffID 0x46464952 /* "RIFF", in ascii. */
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86 #define waveID 0x45564157 /* "WAVE", in ascii. */
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87
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88
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89 /*****************************************************************************
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90 * The FORMAT chunk... *
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91 *****************************************************************************/
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92
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93 #define fmtID 0x20746D66 /* "fmt ", in ascii. */
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94
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95 #define FMT_NORMAL 0x0001 /* Uncompressed waveform data. */
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96 #define FMT_ADPCM 0x0002 /* ADPCM compressed waveform data. */
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97
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98 typedef struct {
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99 Uint16 iCoef1;
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100 Uint16 iCoef2;
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101 } ADPCMCOEFSET;
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102
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103 typedef struct S_FMT_T
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104 {
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105 Uint32 chunkID;
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106 Sint32 chunkSize;
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107 Sint16 wFormatTag;
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108 Uint16 wChannels;
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109 Uint32 dwSamplesPerSec;
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110 Uint32 dwAvgBytesPerSec;
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111 Uint16 wBlockAlign;
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112 Uint16 wBitsPerSample;
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113
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114 void (*free)(struct S_FMT_T *fmt);
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115 Uint32(*read_sample)(Sound_Sample *sample);
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116
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117 union
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118 {
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119 struct
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120 {
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121 Uint16 cbSize;
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122 Uint16 wSamplesPerBlock;
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123 Uint16 wNumCoef;
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124 ADPCMCOEFSET *aCoeff;
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125 } adpcm;
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126 } fmt;
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127 } fmt_t;
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128
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129
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130 /*
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131 * Read in a fmt_t from disk. This makes this process safe regardless of
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132 * the processor's byte order or how the fmt_t structure is packed.
124
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133 * Note that the union "fmt" is not read in here; that is handled as
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134 * needed in the read_fmt_* functions.
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135 */
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136 static int read_fmt_chunk(SDL_RWops *rw, fmt_t *fmt)
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137 {
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138 /* skip reading the chunk ID, since it was already read at this point... */
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139 fmt->chunkID = fmtID;
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140
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141 if (SDL_RWread(rw, &fmt->chunkSize, sizeof (fmt->chunkSize), 1) != 1)
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142 return(0);
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143 fmt->chunkSize = SDL_SwapLE32(fmt->chunkSize);
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144
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145 if (SDL_RWread(rw, &fmt->wFormatTag, sizeof (fmt->wFormatTag), 1) != 1)
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146 return(0);
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147 fmt->wFormatTag = SDL_SwapLE16(fmt->wFormatTag);
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148
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149 if (SDL_RWread(rw, &fmt->wChannels, sizeof (fmt->wChannels), 1) != 1)
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150 return(0);
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151 fmt->wChannels = SDL_SwapLE16(fmt->wChannels);
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152
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153 if (SDL_RWread(rw, &fmt->dwSamplesPerSec,
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154 sizeof (fmt->dwSamplesPerSec), 1) != 1)
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155 return(0);
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156 fmt->dwSamplesPerSec = SDL_SwapLE32(fmt->dwSamplesPerSec);
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157
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158 if (SDL_RWread(rw, &fmt->dwAvgBytesPerSec,
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159 sizeof (fmt->dwAvgBytesPerSec), 1) != 1)
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160 return(0);
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161 fmt->dwAvgBytesPerSec = SDL_SwapLE32(fmt->dwAvgBytesPerSec);
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162
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163 if (SDL_RWread(rw, &fmt->wBlockAlign, sizeof (fmt->wBlockAlign), 1) != 1)
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164 return(0);
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parents:
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165 fmt->wBlockAlign = SDL_SwapLE16(fmt->wBlockAlign);
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166
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167 if (SDL_RWread(rw, &fmt->wBitsPerSample,
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parents:
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168 sizeof (fmt->wBitsPerSample), 1) != 1)
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169 return(0);
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170 fmt->wBitsPerSample = SDL_SwapLE16(fmt->wBitsPerSample);
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171
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172 return(1);
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173 } /* read_fmt_chunk */
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174
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175
124
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diff changeset
176
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177 /*****************************************************************************
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178 * The DATA chunk... *
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179 *****************************************************************************/
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180
17
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181 #define dataID 0x61746164 /* "data", in ascii. */
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182
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183 typedef struct
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184 {
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185 Uint32 chunkID;
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186 Sint32 chunkSize;
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187 /* Then, (chunkSize) bytes of waveform data... */
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188 } data_t;
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189
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190
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191 /*
124
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192 * Read in a data_t from disk. This makes this process safe regardless of
17
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193 * the processor's byte order or how the fmt_t structure is packed.
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194 */
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195 static int read_data_chunk(SDL_RWops *rw, data_t *data)
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196 {
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197 /* skip reading the chunk ID, since it was already read at this point... */
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198 data->chunkID = dataID;
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199
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200 if (SDL_RWread(rw, &data->chunkSize, sizeof (data->chunkSize), 1) != 1)
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201 return(0);
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202 data->chunkSize = SDL_SwapLE32(data->chunkSize);
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203
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204 return(1);
40
c15396fc0e55 Fixed incorrect comment, by Torbj�rn Andersson. :)
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205 } /* read_data_chunk */
17
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206
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207
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208
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209
124
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210 /*****************************************************************************
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211 * this is what we store in our internal->decoder_private field... *
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212 *****************************************************************************/
17
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213
124
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diff changeset
214 typedef struct
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215 {
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216 fmt_t *fmt;
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217 Sint32 bytesLeft;
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218 } wav_t;
17
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219
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220
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221
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222
124
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diff changeset
223 /*****************************************************************************
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diff changeset
224 * Normal, uncompressed waveform handler... *
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diff changeset
225 *****************************************************************************/
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diff changeset
226
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diff changeset
227 static Uint32 read_sample_fmt_normal(Sound_Sample *sample)
17
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228 {
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229 Uint32 retval;
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230 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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231 wav_t *w = (wav_t *) internal->decoder_private;
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232 Uint32 max = (internal->buffer_size < (Uint32) w->bytesLeft) ?
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233 internal->buffer_size : (Uint32) w->bytesLeft;
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234
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235 assert(max > 0);
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236
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Ryan C. Gordon <icculus@icculus.org>
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237 /*
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parents:
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238 * We don't actually do any decoding, so we read the wav data
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Ryan C. Gordon <icculus@icculus.org>
parents:
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239 * directly into the internal buffer...
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240 */
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241 retval = SDL_RWread(internal->rw, internal->buffer, 1, max);
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242
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243 w->bytesLeft -= retval;
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244
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245 /* Make sure the read went smoothly... */
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parents:
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246 if ((retval == 0) || (w->bytesLeft == 0))
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247 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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248
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249 else if (retval == -1)
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250 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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251
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Ryan C. Gordon <icculus@icculus.org>
parents:
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252 /* (next call this EAGAIN may turn into an EOF or error.) */
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253 else if (retval < internal->buffer_size)
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254 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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255
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256 return(retval);
124
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
257 } /* read_sample_fmt_normal */
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diff changeset
258
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
259
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diff changeset
260 static void free_fmt_normal(fmt_t *fmt)
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diff changeset
261 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
262 /* it's a no-op. */
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
263 } /* free_fmt_normal */
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parents: 106
diff changeset
264
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
265
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266 static int read_fmt_normal(SDL_RWops *rw, fmt_t *fmt)
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diff changeset
267 {
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
268 fmt->free = free_fmt_normal;
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diff changeset
269 fmt->read_sample = read_sample_fmt_normal;
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diff changeset
270 return(1);
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diff changeset
271 } /* read_fmt_normal */
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diff changeset
272
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
273
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diff changeset
274
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diff changeset
275 /*****************************************************************************
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diff changeset
276 * ADPCM compression handler... *
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diff changeset
277 *****************************************************************************/
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diff changeset
278
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diff changeset
279 static Uint32 read_sample_fmt_adpcm(Sound_Sample *sample)
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diff changeset
280 {
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diff changeset
281 /* !!! FIXME: Write this. */
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diff changeset
282 sample->flags | SOUND_SAMPLEFLAG_ERROR;
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diff changeset
283 return(0);
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diff changeset
284 } /* read_sample_fmt_adpcm */
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diff changeset
285
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diff changeset
286
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diff changeset
287 static void free_fmt_adpcm(fmt_t *fmt)
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diff changeset
288 {
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diff changeset
289 if (fmt->fmt.adpcm.aCoeff != NULL)
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diff changeset
290 free(fmt->fmt.adpcm.aCoeff);
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diff changeset
291 } /* free_fmt_adpcm */
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diff changeset
292
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
293
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diff changeset
294 /*
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diff changeset
295 * Read in a the adpcm-specific info from disk. This makes this process
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diff changeset
296 * safe regardless of the processor's byte order or how the fmt_t
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diff changeset
297 * structure is packed.
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diff changeset
298 */
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diff changeset
299 static int read_fmt_adpcm(SDL_RWops *rw, fmt_t *fmt)
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diff changeset
300 {
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parents: 106
diff changeset
301 size_t i;
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diff changeset
302
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diff changeset
303 fmt->fmt.adpcm.aCoeff = NULL;
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
304 fmt->free = free_fmt_adpcm;
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
305 fmt->read_sample = read_sample_fmt_adpcm;
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
306
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
307 if (SDL_RWread(rw, &fmt->fmt.adpcm.cbSize,
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
308 sizeof (fmt->fmt.adpcm.cbSize), 1) != 1)
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
309 {
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diff changeset
310 return(0);
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diff changeset
311 } /* if */
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diff changeset
312 fmt->fmt.adpcm.cbSize = SDL_SwapLE16(fmt->fmt.adpcm.cbSize);
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diff changeset
313
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
314 if (SDL_RWread(rw, &fmt->fmt.adpcm.wSamplesPerBlock,
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
315 sizeof (fmt->fmt.adpcm.wSamplesPerBlock), 1) != 1)
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parents: 106
diff changeset
316 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
317 return(0);
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
318 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
319 fmt->fmt.adpcm.wSamplesPerBlock = SDL_SwapLE16(fmt->fmt.adpcm.wSamplesPerBlock);
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parents: 106
diff changeset
320
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
321 if (SDL_RWread(rw, &fmt->fmt.adpcm.wNumCoef,
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
322 sizeof (fmt->fmt.adpcm.wNumCoef), 1) != 1)
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
323 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
324 return(0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
325 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
326 fmt->fmt.adpcm.wNumCoef = SDL_SwapLE16(fmt->fmt.adpcm.wNumCoef);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
327
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
328 i = sizeof (ADPCMCOEFSET) * fmt->fmt.adpcm.wNumCoef;
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
329 fmt->fmt.adpcm.aCoeff = (ADPCMCOEFSET *) malloc(i);
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
330 BAIL_IF_MACRO(fmt->fmt.adpcm.aCoeff == NULL, ERR_OUT_OF_MEMORY, 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
331
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
332 for (i = 0; i < fmt->fmt.adpcm.wNumCoef; i++)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
333 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
334 if (SDL_RWread(rw, &fmt->fmt.adpcm.aCoeff[i].iCoef1,
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
335 sizeof (fmt->fmt.adpcm.aCoeff[i].iCoef1), 1) != 1)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
336 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
337 return(0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
338 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
339
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
340 if (SDL_RWread(rw, &fmt->fmt.adpcm.aCoeff[i].iCoef2,
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
341 sizeof (fmt->fmt.adpcm.aCoeff[i].iCoef2), 1) != 1)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
342 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
343 return(0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
344 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
345 } /* for */
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
346
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
347 return(1);
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
348 } /* read_fmt_adpcm */
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
349
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
350
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
351 /*****************************************************************************
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
352 * Everything else... *
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
353 *****************************************************************************/
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
354
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
355
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
356 static int read_fmt(SDL_RWops *rw, fmt_t *fmt)
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
357 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
358 /* if it's in this switch statement, we support the format. */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
359 switch (fmt->wFormatTag)
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
360 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
361 case FMT_NORMAL:
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
362 return(read_fmt_normal(rw, fmt));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
363
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
364 case FMT_ADPCM:
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
365 return(read_fmt_adpcm(rw, fmt));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
366 } /* switch */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
367
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
368 SNDDBG(("WAV: Format %d is unknown.\n", (int) fmt->wFormatTag));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
369 Sound_SetError("WAV: Unsupported format");
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
370 return(0); /* not supported whatsoever. */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
371 } /* read_fmt */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
372
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
373
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
374 /*
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
375 * Locate a specific chunk in the WAVE file by ID...
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
376 */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
377 static int find_chunk(SDL_RWops *rw, Uint32 id)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
378 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
379 Sint32 siz = 0;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
380 Uint32 _id = 0;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
381
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
382 while (1)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
383 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
384 BAIL_IF_MACRO(SDL_RWread(rw, &_id, sizeof (_id), 1) != 1, NULL, 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
385 if (SDL_SwapLE32(_id) == id)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
386 return(1);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
387
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
388 BAIL_IF_MACRO(SDL_RWread(rw, &siz, sizeof (siz), 1) != 1, NULL, 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
389 siz = SDL_SwapLE32(siz);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
390 assert(siz > 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
391 BAIL_IF_MACRO(SDL_RWseek(rw, siz, SEEK_SET) != siz, NULL, 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
392 } /* while */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
393
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
394 return(0); /* shouldn't hit this, but just in case... */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
395 } /* find_chunk */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
396
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
397
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
398 static int WAV_open_internal(Sound_Sample *sample, const char *ext, fmt_t *fmt)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
399 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
400 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
401 SDL_RWops *rw = internal->rw;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
402 data_t d;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
403 wav_t *w;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
404
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
405 BAIL_IF_MACRO(SDL_ReadLE32(rw) != riffID, "WAV: Not a RIFF file.", 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
406 SDL_ReadLE32(rw); /* throw the length away; we get this info later. */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
407 BAIL_IF_MACRO(SDL_ReadLE32(rw) != waveID, "WAV: Not a WAVE file.", 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
408 BAIL_IF_MACRO(!find_chunk(rw, fmtID), "WAV: No format chunk.", 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
409 BAIL_IF_MACRO(!read_fmt_chunk(rw, fmt), "WAV: Can't read format chunk.", 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
410
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
411 sample->actual.channels = (Uint8) fmt->wChannels;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
412 sample->actual.rate = fmt->dwSamplesPerSec;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
413 if (fmt->wBitsPerSample <= 8)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
414 sample->actual.format = AUDIO_U8;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
415 else if (fmt->wBitsPerSample <= 16)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
416 sample->actual.format = AUDIO_S16LSB;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
417 else
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
418 BAIL_MACRO("WAV: Unsupported sample size.", 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
419
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
420 BAIL_IF_MACRO(!read_fmt(rw, fmt), NULL, 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
421 BAIL_IF_MACRO(!find_chunk(rw, dataID), "WAV: No data chunk.", 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
422 BAIL_IF_MACRO(!read_data_chunk(rw, &d), "WAV: Can't read data chunk.", 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
423
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
424 w = (wav_t *) malloc(sizeof(wav_t));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
425 BAIL_IF_MACRO(w == NULL, ERR_OUT_OF_MEMORY, 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
426 w->fmt = fmt;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
427 w->bytesLeft = d.chunkSize;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
428 internal->decoder_private = (void *) w;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
429
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
430 sample->flags = SOUND_SAMPLEFLAG_NONE;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
431
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
432 SNDDBG(("WAV: Accepting data stream.\n"));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
433 return(1); /* we'll handle this data. */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
434 } /* WAV_open_internal */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
435
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
436
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
437 static int WAV_open(Sound_Sample *sample, const char *ext)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
438 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
439 int rc;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
440
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
441 fmt_t *fmt = (fmt_t *) malloc(sizeof (fmt_t));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
442 BAIL_IF_MACRO(fmt == NULL, ERR_OUT_OF_MEMORY, 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
443 memset(fmt, '\0', sizeof (fmt_t));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
444
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
445 rc = WAV_open_internal(sample, ext, fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
446 if (!rc)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
447 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
448 if (fmt->free != NULL)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
449 fmt->free(fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
450 free(fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
451 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
452
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
453 return(rc);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
454 } /* WAV_open */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
455
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
456
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
457 static void WAV_close(Sound_Sample *sample)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
458 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
459 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
460 wav_t *w = (wav_t *) internal->decoder_private;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
461 w->fmt->free(w->fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
462 free(w->fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
463 free(w);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
464 } /* WAV_close */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
465
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
466
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
467 static Uint32 WAV_read(Sound_Sample *sample)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
468 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
469 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
470 wav_t *w = (wav_t *) internal->decoder_private;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
471 return(w->fmt->read_sample(sample));
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472 } /* WAV_read */
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473
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474 #endif /* SOUND_SUPPORTS_WAV */
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475
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476 /* end of wav.c ... */
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477