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annotate decoders/wav.c @ 124:e46e31fdecfd

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Restructured to handle multiple formats.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 08 Oct 2001 19:13:16 +0000
parents 40de367eb59e
children 1df5c106504e
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
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53 const Sound_DecoderFunctions __Sound_DecoderFunctions_WAV =
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54 {
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55 {
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56 "WAV",
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57 "Microsoft WAVE audio format",
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58 "Ryan C. Gordon <icculus@clutteredmind.org>",
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59 "http://www.icculus.org/SDL_sound/"
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60 },
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61
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62 WAV_init, /* init() method */
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63 WAV_quit, /* quit() method */
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64 WAV_open, /* open() method */
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65 WAV_close, /* close() method */
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66 WAV_read /* read() method */
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67 };
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68
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69 static int WAV_init(void)
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70 {
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71 return(1); /* always succeeds. */
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72 } /* WAV_init */
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73
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74
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75 static void WAV_quit(void)
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76 {
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77 /* it's a no-op. */
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78 } /* WAV_quit */
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79
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80
124
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81
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82 /* Chunk management code... */
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83
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84 #define riffID 0x46464952 /* "RIFF", in ascii. */
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85 #define waveID 0x45564157 /* "WAVE", in ascii. */
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86
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87
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88 /*****************************************************************************
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89 * The FORMAT chunk... *
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90 *****************************************************************************/
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91
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92 #define fmtID 0x20746D66 /* "fmt ", in ascii. */
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93
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94 #define FMT_NORMAL 0x0001 /* Uncompressed waveform data. */
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95 #define FMT_ADPCM 0x0002 /* ADPCM compressed waveform data. */
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96
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97 typedef struct {
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98 Uint16 iCoef1;
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99 Uint16 iCoef2;
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100 } ADPCMCOEFSET;
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101
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102 typedef struct S_FMT_T
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103 {
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104 Uint32 chunkID;
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105 Sint32 chunkSize;
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106 Sint16 wFormatTag;
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107 Uint16 wChannels;
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108 Uint32 dwSamplesPerSec;
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109 Uint32 dwAvgBytesPerSec;
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110 Uint16 wBlockAlign;
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111 Uint16 wBitsPerSample;
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112
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113 void (*free)(struct S_FMT_T *fmt);
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114 Uint32(*read_sample)(Sound_Sample *sample);
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115
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116 union
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117 {
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118 struct
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119 {
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120 Uint16 cbSize;
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121 Uint16 wSamplesPerBlock;
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122 Uint16 wNumCoef;
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123 ADPCMCOEFSET *aCoeff;
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124 } adpcm;
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125 } fmt;
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126 } fmt_t;
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127
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128
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129 /*
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130 * Read in a fmt_t from disk. This makes this process safe regardless of
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131 * the processor's byte order or how the fmt_t structure is packed.
124
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132 * Note that the union "fmt" is not read in here; that is handled as
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133 * needed in the read_fmt_* functions.
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134 */
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135 static int read_fmt_chunk(SDL_RWops *rw, fmt_t *fmt)
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136 {
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137 /* skip reading the chunk ID, since it was already read at this point... */
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138 fmt->chunkID = fmtID;
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139
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140 if (SDL_RWread(rw, &fmt->chunkSize, sizeof (fmt->chunkSize), 1) != 1)
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141 return(0);
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142 fmt->chunkSize = SDL_SwapLE32(fmt->chunkSize);
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143
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144 if (SDL_RWread(rw, &fmt->wFormatTag, sizeof (fmt->wFormatTag), 1) != 1)
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145 return(0);
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146 fmt->wFormatTag = SDL_SwapLE16(fmt->wFormatTag);
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147
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148 if (SDL_RWread(rw, &fmt->wChannels, sizeof (fmt->wChannels), 1) != 1)
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149 return(0);
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150 fmt->wChannels = SDL_SwapLE16(fmt->wChannels);
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151
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152 if (SDL_RWread(rw, &fmt->dwSamplesPerSec,
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153 sizeof (fmt->dwSamplesPerSec), 1) != 1)
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154 return(0);
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155 fmt->dwSamplesPerSec = SDL_SwapLE32(fmt->dwSamplesPerSec);
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156
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157 if (SDL_RWread(rw, &fmt->dwAvgBytesPerSec,
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158 sizeof (fmt->dwAvgBytesPerSec), 1) != 1)
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159 return(0);
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160 fmt->dwAvgBytesPerSec = SDL_SwapLE32(fmt->dwAvgBytesPerSec);
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161
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162 if (SDL_RWread(rw, &fmt->wBlockAlign, sizeof (fmt->wBlockAlign), 1) != 1)
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163 return(0);
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164 fmt->wBlockAlign = SDL_SwapLE16(fmt->wBlockAlign);
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165
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166 if (SDL_RWread(rw, &fmt->wBitsPerSample,
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167 sizeof (fmt->wBitsPerSample), 1) != 1)
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168 return(0);
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169 fmt->wBitsPerSample = SDL_SwapLE16(fmt->wBitsPerSample);
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170
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171 return(1);
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172 } /* read_fmt_chunk */
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173
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174
124
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175
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176 /*****************************************************************************
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177 * The DATA chunk... *
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178 *****************************************************************************/
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179
17
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180 #define dataID 0x61746164 /* "data", in ascii. */
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181
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182 typedef struct
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183 {
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184 Uint32 chunkID;
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185 Sint32 chunkSize;
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186 /* Then, (chunkSize) bytes of waveform data... */
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187 } data_t;
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188
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189
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190 /*
124
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191 * Read in a data_t from disk. This makes this process safe regardless of
17
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192 * the processor's byte order or how the fmt_t structure is packed.
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193 */
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194 static int read_data_chunk(SDL_RWops *rw, data_t *data)
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195 {
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196 /* skip reading the chunk ID, since it was already read at this point... */
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197 data->chunkID = dataID;
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198
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199 if (SDL_RWread(rw, &data->chunkSize, sizeof (data->chunkSize), 1) != 1)
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200 return(0);
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201 data->chunkSize = SDL_SwapLE32(data->chunkSize);
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202
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203 return(1);
40
c15396fc0e55 Fixed incorrect comment, by Torbj�rn Andersson. :)
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204 } /* read_data_chunk */
17
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205
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206
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207
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208
124
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209 /*****************************************************************************
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210 * this is what we store in our internal->decoder_private field... *
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211 *****************************************************************************/
17
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212
124
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213 typedef struct
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214 {
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215 fmt_t *fmt;
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216 Sint32 bytesLeft;
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217 } wav_t;
17
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218
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219
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220
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221
124
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diff changeset
222 /*****************************************************************************
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223 * Normal, uncompressed waveform handler... *
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224 *****************************************************************************/
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225
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226 static Uint32 read_sample_fmt_normal(Sound_Sample *sample)
17
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227 {
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228 Uint32 retval;
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229 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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230 wav_t *w = (wav_t *) internal->decoder_private;
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231 Uint32 max = (internal->buffer_size < (Uint32) w->bytesLeft) ?
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232 internal->buffer_size : (Uint32) w->bytesLeft;
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233
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234 assert(max > 0);
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235
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Ryan C. Gordon <icculus@icculus.org>
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236 /*
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237 * We don't actually do any decoding, so we read the wav data
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Ryan C. Gordon <icculus@icculus.org>
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238 * directly into the internal buffer...
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239 */
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240 retval = SDL_RWread(internal->rw, internal->buffer, 1, max);
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241
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242 w->bytesLeft -= retval;
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243
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244 /* Make sure the read went smoothly... */
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245 if ((retval == 0) || (w->bytesLeft == 0))
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246 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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247
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248 else if (retval == -1)
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249 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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250
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251 /* (next call this EAGAIN may turn into an EOF or error.) */
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252 else if (retval < internal->buffer_size)
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253 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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254
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255 return(retval);
124
e46e31fdecfd Restructured to handle multiple formats.
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256 } /* read_sample_fmt_normal */
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diff changeset
257
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
258
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259 static void free_fmt_normal(fmt_t *fmt)
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260 {
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diff changeset
261 /* it's a no-op. */
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262 } /* free_fmt_normal */
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diff changeset
263
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
264
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265 static int read_fmt_normal(SDL_RWops *rw, fmt_t *fmt)
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266 {
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diff changeset
267 fmt->free = free_fmt_normal;
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268 fmt->read_sample = read_sample_fmt_normal;
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269 return(1);
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270 } /* read_fmt_normal */
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diff changeset
271
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diff changeset
272
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diff changeset
273
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diff changeset
274 /*****************************************************************************
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275 * ADPCM compression handler... *
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276 *****************************************************************************/
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diff changeset
277
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diff changeset
278 static Uint32 read_sample_fmt_adpcm(Sound_Sample *sample)
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diff changeset
279 {
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diff changeset
280 /* !!! FIXME: Write this. */
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281 sample->flags | SOUND_SAMPLEFLAG_ERROR;
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282 return(0);
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diff changeset
283 } /* read_sample_fmt_adpcm */
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284
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diff changeset
285
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286 static void free_fmt_adpcm(fmt_t *fmt)
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diff changeset
287 {
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diff changeset
288 if (fmt->fmt.adpcm.aCoeff != NULL)
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
289 free(fmt->fmt.adpcm.aCoeff);
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290 } /* free_fmt_adpcm */
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291
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diff changeset
292
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diff changeset
293 /*
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diff changeset
294 * Read in a the adpcm-specific info from disk. This makes this process
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diff changeset
295 * safe regardless of the processor's byte order or how the fmt_t
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296 * structure is packed.
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diff changeset
297 */
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diff changeset
298 static int read_fmt_adpcm(SDL_RWops *rw, fmt_t *fmt)
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diff changeset
299 {
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diff changeset
300 size_t i;
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diff changeset
301
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diff changeset
302 fmt->fmt.adpcm.aCoeff = NULL;
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
303 fmt->free = free_fmt_adpcm;
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
304 fmt->read_sample = read_sample_fmt_adpcm;
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diff changeset
305
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diff changeset
306 if (SDL_RWread(rw, &fmt->fmt.adpcm.cbSize,
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
307 sizeof (fmt->fmt.adpcm.cbSize), 1) != 1)
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
308 {
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
309 return(0);
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diff changeset
310 } /* if */
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diff changeset
311 fmt->fmt.adpcm.cbSize = SDL_SwapLE16(fmt->fmt.adpcm.cbSize);
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diff changeset
312
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diff changeset
313 if (SDL_RWread(rw, &fmt->fmt.adpcm.wSamplesPerBlock,
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
314 sizeof (fmt->fmt.adpcm.wSamplesPerBlock), 1) != 1)
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parents: 106
diff changeset
315 {
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
316 return(0);
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
317 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
318 fmt->fmt.adpcm.wSamplesPerBlock = SDL_SwapLE16(fmt->fmt.adpcm.wSamplesPerBlock);
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parents: 106
diff changeset
319
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
320 if (SDL_RWread(rw, &fmt->fmt.adpcm.wNumCoef,
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
321 sizeof (fmt->fmt.adpcm.wNumCoef), 1) != 1)
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
322 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
323 return(0);
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
324 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
325 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
326
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
327 i = sizeof (ADPCMCOEFSET) * fmt->fmt.adpcm.wNumCoef;
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
328 fmt->fmt.adpcm.aCoeff = (ADPCMCOEFSET *) malloc(i);
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
329 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
330
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
331 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
332 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
333 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
334 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
335 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
336 return(0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
337 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
338
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
339 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
340 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
341 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
342 return(0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
343 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
344 } /* for */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
345
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
346 return(1);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
347 } /* read_fmt_adpcm */
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
348
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
349
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
350 /*****************************************************************************
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
351 * Everything else... *
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
352 *****************************************************************************/
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
353
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
354
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
355 static int read_fmt(SDL_RWops *rw, fmt_t *fmt)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
356 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
357 /* 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
358 switch (fmt->wFormatTag)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
359 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
360 case FMT_NORMAL:
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
361 return(read_fmt_normal(rw, fmt));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
362
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
363 case FMT_ADPCM:
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
364 return(read_fmt_adpcm(rw, fmt));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
365 } /* switch */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
366
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
367 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
368 Sound_SetError("WAV: Unsupported format");
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
369 return(0); /* not supported whatsoever. */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
370 } /* read_fmt */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
371
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.
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parents: 106
diff changeset
374 * 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
375 */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
376 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
377 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
378 Sint32 siz = 0;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
379 Uint32 _id = 0;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
380
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
381 while (1)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
382 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
383 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
384 if (SDL_SwapLE32(_id) == id)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
385 return(1);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
386
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
387 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
388 siz = SDL_SwapLE32(siz);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
389 assert(siz > 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
390 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
391 } /* while */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
392
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
393 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
394 } /* find_chunk */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
395
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 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
398 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
399 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
400 SDL_RWops *rw = internal->rw;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
401 data_t d;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
402 wav_t *w;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
403
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
404 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
405 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
406 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
407 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
408 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
409
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
410 sample->actual.channels = (Uint8) fmt->wChannels;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
411 sample->actual.rate = fmt->dwSamplesPerSec;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
412 if (fmt->wBitsPerSample <= 8)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
413 sample->actual.format = AUDIO_U8;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
414 else if (fmt->wBitsPerSample <= 16)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
415 sample->actual.format = AUDIO_S16LSB;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
416 else
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
417 BAIL_MACRO("WAV: Unsupported sample size.", 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
418
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
419 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
420 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
421 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
422
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
423 w = (wav_t *) malloc(sizeof(wav_t));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
424 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
425 w->fmt = fmt;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
426 w->bytesLeft = d.chunkSize;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
427 internal->decoder_private = (void *) w;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
428
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
429 sample->flags = SOUND_SAMPLEFLAG_NONE;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
430
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
431 SNDDBG(("WAV: Accepting data stream.\n"));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
432 return(1); /* we'll handle this data. */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
433 } /* WAV_open_internal */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
434
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 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
437 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
438 int rc;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
439
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
440 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
441 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
442 memset(fmt, '\0', sizeof (fmt_t));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
443
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
444 rc = WAV_open_internal(sample, ext, fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
445 if (!rc)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
446 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
447 if (fmt->free != NULL)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
448 fmt->free(fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
449 free(fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
450 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
451
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
452 return(rc);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
453 } /* WAV_open */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
454
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 static void WAV_close(Sound_Sample *sample)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
457 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
458 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
459 wav_t *w = (wav_t *) internal->decoder_private;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
460 w->fmt->free(w->fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
461 free(w->fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
462 free(w);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
463 } /* WAV_close */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
464
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 static Uint32 WAV_read(Sound_Sample *sample)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
467 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
468 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
469 wav_t *w = (wav_t *) internal->decoder_private;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
470 return(w->fmt->read_sample(sample));
17
102cf61c0816 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
471 } /* WAV_read */
102cf61c0816 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
472
64
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473 #endif /* SOUND_SUPPORTS_WAV */
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102cf61c0816 Initial add.
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102cf61c0816 Initial add.
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475 /* end of wav.c ... */
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476