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17
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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
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31 #include <stdio.h>
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32 #include <stdlib.h>
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33 #include <string.h>
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34 #include <assert.h>
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35 #include "SDL_sound.h"
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36
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37 #define __SDL_SOUND_INTERNAL__
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38 #include "SDL_sound_internal.h"
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39
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40 #if (!defined SOUND_SUPPORTS_WAV)
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41 #error SOUND_SUPPORTS_WAV must be defined.
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42 #endif
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43
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44 static int WAV_open(Sound_Sample *sample, const char *ext);
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45 static void WAV_close(Sound_Sample *sample);
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46 static Uint32 WAV_read(Sound_Sample *sample);
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47
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48 const Sound_DecoderFunctions __Sound_DecoderFunctions_WAV =
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49 {
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50 {
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51 "WAV",
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52 "Microsoft WAVE audio format",
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53 "Ryan C. Gordon <icculus@clutteredmind.org>",
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54 "http://www.icculus.org/SDL_sound/"
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55 },
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56
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57 WAV_open, /* open() method */
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58 WAV_close, /* close() method */
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59 WAV_read /* read() method */
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60 };
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61
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62
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63 /* this is what we store in our internal->decoder_private field... */
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64 typedef struct
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65 {
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66 Sint32 bytesLeft;
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67 } wav_t;
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68
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69
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70 /* Chunk management code... */
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71
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72 #define riffID 0x46464952 /* "RIFF", in ascii. */
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73 #define waveID 0x45564157 /* "WAVE", in ascii. */
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74
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75
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76 #define fmtID 0x20746D66 /* "fmt ", in ascii. */
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77
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78 #define FMT_NORMAL 1 /* Uncompressed waveform data. */
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79
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80 typedef struct
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81 {
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82 Uint32 chunkID;
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83 Sint32 chunkSize;
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84 Sint16 wFormatTag;
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85 Uint16 wChannels;
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86 Uint32 dwSamplesPerSec;
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87 Uint32 dwAvgBytesPerSec;
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88 Uint16 wBlockAlign;
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89 Uint16 wBitsPerSample;
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90 } fmt_t;
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91
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92
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93 /*
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94 * Read in a fmt_t from disk. This makes this process safe regardless of
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95 * the processor's byte order or how the fmt_t structure is packed.
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96 */
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97 static int read_fmt_chunk(SDL_RWops *rw, fmt_t *fmt)
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98 {
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99 /* skip reading the chunk ID, since it was already read at this point... */
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100 fmt->chunkID = fmtID;
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101
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102 if (SDL_RWread(rw, &fmt->chunkSize, sizeof (fmt->chunkSize), 1) != 1)
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103 return(0);
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104 fmt->chunkSize = SDL_SwapLE32(fmt->chunkSize);
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105
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106 if (SDL_RWread(rw, &fmt->wFormatTag, sizeof (fmt->wFormatTag), 1) != 1)
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107 return(0);
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108 fmt->wFormatTag = SDL_SwapLE16(fmt->wFormatTag);
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109
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110 if (SDL_RWread(rw, &fmt->wChannels, sizeof (fmt->wChannels), 1) != 1)
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111 return(0);
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112 fmt->wChannels = SDL_SwapLE16(fmt->wChannels);
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113
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114 if (SDL_RWread(rw, &fmt->dwSamplesPerSec,
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115 sizeof (fmt->dwSamplesPerSec), 1) != 1)
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116 return(0);
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117 fmt->dwSamplesPerSec = SDL_SwapLE32(fmt->dwSamplesPerSec);
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118
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119 if (SDL_RWread(rw, &fmt->dwAvgBytesPerSec,
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120 sizeof (fmt->dwAvgBytesPerSec), 1) != 1)
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121 return(0);
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122 fmt->dwAvgBytesPerSec = SDL_SwapLE32(fmt->dwAvgBytesPerSec);
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123
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124 if (SDL_RWread(rw, &fmt->wBlockAlign, sizeof (fmt->wBlockAlign), 1) != 1)
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125 return(0);
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126 fmt->wBlockAlign = SDL_SwapLE16(fmt->wBlockAlign);
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127
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128 if (SDL_RWread(rw, &fmt->wBitsPerSample,
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129 sizeof (fmt->wBitsPerSample), 1) != 1)
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130 return(0);
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131 fmt->wBitsPerSample = SDL_SwapLE16(fmt->wBitsPerSample);
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132
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133 return(1);
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134 } /* read_fmt_chunk */
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135
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136
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137 #define dataID 0x61746164 /* "data", in ascii. */
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138
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139 typedef struct
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140 {
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141 Uint32 chunkID;
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142 Sint32 chunkSize;
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143 /* Then, (chunkSize) bytes of waveform data... */
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144 } data_t;
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145
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146
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147 /*
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148 * Read in a fmt_t from disk. This makes this process safe regardless of
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149 * the processor's byte order or how the fmt_t structure is packed.
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150 */
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151 static int read_data_chunk(SDL_RWops *rw, data_t *data)
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152 {
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153 /* skip reading the chunk ID, since it was already read at this point... */
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154 data->chunkID = dataID;
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155
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156 if (SDL_RWread(rw, &data->chunkSize, sizeof (data->chunkSize), 1) != 1)
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157 return(0);
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158 data->chunkSize = SDL_SwapLE32(data->chunkSize);
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159
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160 return(1);
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161 } /* read_fmt_chunk */
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162
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163
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164 static int find_chunk(SDL_RWops *rw, Uint32 id)
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165 {
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166 Sint32 siz = 0;
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167 Uint32 _id = 0;
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168
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169 while (1)
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170 {
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171 BAIL_IF_MACRO(SDL_RWread(rw, &_id, sizeof (_id), 1) != 1, NULL, 0);
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172 if (SDL_SwapLE32(_id) == id)
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173 return(1);
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174
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175 BAIL_IF_MACRO(SDL_RWread(rw, &siz, sizeof (siz), 1) != 1, NULL, 0);
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176 siz = SDL_SwapLE32(siz);
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177 assert(siz > 0);
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178 BAIL_IF_MACRO(SDL_RWseek(rw, siz, SEEK_SET) != siz, NULL, 0);
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179 } /* while */
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180
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181 return(0); /* shouldn't hit this, but just in case... */
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182 } /* find_chunk */
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183
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184
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185 static int WAV_open(Sound_Sample *sample, const char *ext)
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186 {
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187 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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188 SDL_RWops *rw = internal->rw;
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189 fmt_t f;
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190 data_t d;
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191 wav_t *w;
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192
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193 BAIL_IF_MACRO(SDL_ReadLE32(rw) != riffID, "WAV: Not a RIFF file.", 0);
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194 SDL_ReadLE32(rw); /* throw the length away; we get this info later. */
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195 BAIL_IF_MACRO(SDL_ReadLE32(rw) != waveID, "WAV: Not a WAVE file.", 0);
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196 BAIL_IF_MACRO(!find_chunk(rw, fmtID), "WAV: No format chunk.", 0);
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197 BAIL_IF_MACRO(!read_fmt_chunk(rw, &f), "WAV: Can't read format chunk.", 0);
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198
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199 /* !!! FIXME: This will have to change for compression types... */
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200 BAIL_IF_MACRO(f.wFormatTag != FMT_NORMAL, "WAV: Unsupported encoding.", 0);
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201
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202 sample->actual.channels = (Uint8) f.wChannels;
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203 sample->actual.rate = f.dwSamplesPerSec;
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204
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205 if (f.wBitsPerSample <= 8)
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206 sample->actual.format = AUDIO_U8;
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207 else if (f.wBitsPerSample <= 16)
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208 sample->actual.format = AUDIO_S16LSB;
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209 else
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210 BAIL_MACRO("WAV: Unsupported sample size.", 0);
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211
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212 BAIL_IF_MACRO(!find_chunk(rw, dataID), "WAV: No data chunk.", 0);
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213 BAIL_IF_MACRO(!read_data_chunk(rw, &d), "WAV: Can't read data chunk.", 0);
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214
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215 w = (wav_t *) malloc(sizeof(wav_t));
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216 BAIL_IF_MACRO(w == NULL, ERR_OUT_OF_MEMORY, 0);
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217 w->bytesLeft = d.chunkSize;
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218 internal->decoder_private = (void *) w;
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219
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220 sample->flags = SOUND_SAMPLEFLAG_NONE;
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221
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222 _D(("WAV: Accepting data stream.\n"));
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223 return(1); /* we'll handle this data. */
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224 } /* WAV_open */
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225
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226
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227 static void WAV_close(Sound_Sample *sample)
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228 {
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229 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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230 free(internal->decoder_private);
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231 } /* WAV_close */
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232
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233
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234 static Uint32 WAV_read(Sound_Sample *sample)
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235 {
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236 Uint32 retval;
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237 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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238 wav_t *w = (wav_t *) internal->decoder_private;
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239 Uint32 max = (internal->buffer_size < (Uint32) w->bytesLeft) ?
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240 internal->buffer_size : (Uint32) w->bytesLeft;
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241
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242 assert(max > 0);
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243
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244 /*
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245 * We don't actually do any decoding, so we read the wav data
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246 * directly into the internal buffer...
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247 */
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248 retval = SDL_RWread(internal->rw, internal->buffer, 1, max);
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249
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250 w->bytesLeft -= retval;
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251
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252 /* Make sure the read went smoothly... */
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253 if ((retval == 0) || (w->bytesLeft == 0))
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254 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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255
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256 else if (retval == -1)
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257 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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258
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259 /* (next call this EAGAIN may turn into an EOF or error.) */
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260 else if (retval < internal->buffer_size)
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261 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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262
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263 return(retval);
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264 } /* WAV_read */
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265
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266
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267 /* end of wav.c ... */
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268
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