Mercurial > SDL_sound_CoreAudio

annotate decoders/wav.c @ 178:bdbe09014724

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Minor tweaks and such.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 05 Dec 2001 22:24:28 +0000
parents 1df5c106504e
children 26996236d790
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
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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 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 {
149
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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
124
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70
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71 /* Chunk management code... */
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72
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73 #define riffID 0x46464952 /* "RIFF", in ascii. */
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74 #define waveID 0x45564157 /* "WAVE", in ascii. */
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75
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76
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77 /*****************************************************************************
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78 * The FORMAT chunk... *
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79 *****************************************************************************/
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80
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81 #define fmtID 0x20746D66 /* "fmt ", in ascii. */
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82
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83 #define FMT_NORMAL 0x0001 /* Uncompressed waveform data. */
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84 #define FMT_ADPCM 0x0002 /* ADPCM compressed waveform data. */
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85
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86 typedef struct {
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87 Uint16 iCoef1;
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88 Uint16 iCoef2;
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89 } ADPCMCOEFSET;
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90
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91 typedef struct S_WAV_FMT_T
124
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92 {
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93 Uint32 chunkID;
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94 Sint32 chunkSize;
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95 Sint16 wFormatTag;
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96 Uint16 wChannels;
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97 Uint32 dwSamplesPerSec;
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98 Uint32 dwAvgBytesPerSec;
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99 Uint16 wBlockAlign;
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100 Uint16 wBitsPerSample;
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101
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102 void (*free)(struct S_WAV_FMT_T *fmt);
124
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103 Uint32(*read_sample)(Sound_Sample *sample);
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104
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105 union
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106 {
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107 struct
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108 {
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109 Uint16 cbSize;
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110 Uint16 wSamplesPerBlock;
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111 Uint16 wNumCoef;
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112 ADPCMCOEFSET *aCoeff;
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113 } adpcm;
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114
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115 /* put other format-specific data here... */
124
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116 } fmt;
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117 } fmt_t;
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118
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119
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120 /*
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121 * Read in a fmt_t from disk. This makes this process safe regardless of
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122 * the processor's byte order or how the fmt_t structure is packed.
124
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123 * Note that the union "fmt" is not read in here; that is handled as
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124 * needed in the read_fmt_* functions.
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125 */
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126 static int read_fmt_chunk(SDL_RWops *rw, fmt_t *fmt)
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127 {
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128 /* skip reading the chunk ID, since it was already read at this point... */
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129 fmt->chunkID = fmtID;
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130
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131 if (SDL_RWread(rw, &fmt->chunkSize, sizeof (fmt->chunkSize), 1) != 1)
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132 return(0);
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133 fmt->chunkSize = SDL_SwapLE32(fmt->chunkSize);
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134
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135 if (SDL_RWread(rw, &fmt->wFormatTag, sizeof (fmt->wFormatTag), 1) != 1)
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136 return(0);
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137 fmt->wFormatTag = SDL_SwapLE16(fmt->wFormatTag);
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138
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139 if (SDL_RWread(rw, &fmt->wChannels, sizeof (fmt->wChannels), 1) != 1)
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140 return(0);
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141 fmt->wChannels = SDL_SwapLE16(fmt->wChannels);
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142
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143 if (SDL_RWread(rw, &fmt->dwSamplesPerSec,
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144 sizeof (fmt->dwSamplesPerSec), 1) != 1)
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145 return(0);
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146 fmt->dwSamplesPerSec = SDL_SwapLE32(fmt->dwSamplesPerSec);
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147
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148 if (SDL_RWread(rw, &fmt->dwAvgBytesPerSec,
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149 sizeof (fmt->dwAvgBytesPerSec), 1) != 1)
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150 return(0);
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151 fmt->dwAvgBytesPerSec = SDL_SwapLE32(fmt->dwAvgBytesPerSec);
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152
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153 if (SDL_RWread(rw, &fmt->wBlockAlign, sizeof (fmt->wBlockAlign), 1) != 1)
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154 return(0);
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155 fmt->wBlockAlign = SDL_SwapLE16(fmt->wBlockAlign);
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156
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157 if (SDL_RWread(rw, &fmt->wBitsPerSample,
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158 sizeof (fmt->wBitsPerSample), 1) != 1)
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159 return(0);
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160 fmt->wBitsPerSample = SDL_SwapLE16(fmt->wBitsPerSample);
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161
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162 return(1);
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163 } /* read_fmt_chunk */
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164
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165
124
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166
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167 /*****************************************************************************
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168 * The DATA chunk... *
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169 *****************************************************************************/
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170
17
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171 #define dataID 0x61746164 /* "data", in ascii. */
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172
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173 typedef struct
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174 {
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175 Uint32 chunkID;
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176 Sint32 chunkSize;
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177 /* Then, (chunkSize) bytes of waveform data... */
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178 } data_t;
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179
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180
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181 /*
124
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182 * Read in a data_t from disk. This makes this process safe regardless of
17
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183 * the processor's byte order or how the fmt_t structure is packed.
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184 */
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185 static int read_data_chunk(SDL_RWops *rw, data_t *data)
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186 {
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187 /* skip reading the chunk ID, since it was already read at this point... */
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188 data->chunkID = dataID;
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189
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190 if (SDL_RWread(rw, &data->chunkSize, sizeof (data->chunkSize), 1) != 1)
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191 return(0);
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192 data->chunkSize = SDL_SwapLE32(data->chunkSize);
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193
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194 return(1);
40
c15396fc0e55 Fixed incorrect comment, by Torbj�rn Andersson. :)
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195 } /* read_data_chunk */
17
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196
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197
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198
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199
124
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200 /*****************************************************************************
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201 * this is what we store in our internal->decoder_private field... *
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202 *****************************************************************************/
17
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203
124
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204 typedef struct
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205 {
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206 fmt_t *fmt;
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207 Sint32 bytesLeft;
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208 } wav_t;
17
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209
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210
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211
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212
124
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213 /*****************************************************************************
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214 * Normal, uncompressed waveform handler... *
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215 *****************************************************************************/
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216
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217 static Uint32 read_sample_fmt_normal(Sound_Sample *sample)
17
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218 {
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219 Uint32 retval;
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220 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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221 wav_t *w = (wav_t *) internal->decoder_private;
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222 Uint32 max = (internal->buffer_size < (Uint32) w->bytesLeft) ?
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223 internal->buffer_size : (Uint32) w->bytesLeft;
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224
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225 assert(max > 0);
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226
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227 /*
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228 * We don't actually do any decoding, so we read the wav data
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229 * directly into the internal buffer...
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230 */
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231 retval = SDL_RWread(internal->rw, internal->buffer, 1, max);
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232
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233 w->bytesLeft -= retval;
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234
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235 /* Make sure the read went smoothly... */
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236 if ((retval == 0) || (w->bytesLeft == 0))
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237 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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238
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239 else if (retval == -1)
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240 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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241
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242 /* (next call this EAGAIN may turn into an EOF or error.) */
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243 else if (retval < internal->buffer_size)
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244 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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245
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246 return(retval);
124
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247 } /* read_sample_fmt_normal */
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248
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249
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250 static void free_fmt_normal(fmt_t *fmt)
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251 {
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252 /* it's a no-op. */
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253 } /* free_fmt_normal */
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254
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255
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256 static int read_fmt_normal(SDL_RWops *rw, fmt_t *fmt)
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257 {
178
bdbe09014724 Minor tweaks and such.
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258 /* (don't need to read more from the RWops...) */
124
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259 fmt->free = free_fmt_normal;
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260 fmt->read_sample = read_sample_fmt_normal;
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261 return(1);
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262 } /* read_fmt_normal */
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263
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264
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265
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266 /*****************************************************************************
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267 * ADPCM compression handler... *
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268 *****************************************************************************/
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269
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270 static Uint32 read_sample_fmt_adpcm(Sound_Sample *sample)
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271 {
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272 /* !!! FIXME: Write this. */
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273 sample->flags | SOUND_SAMPLEFLAG_ERROR;
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274 return(0);
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275 } /* read_sample_fmt_adpcm */
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276
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277
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278 static void free_fmt_adpcm(fmt_t *fmt)
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279 {
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280 if (fmt->fmt.adpcm.aCoeff != NULL)
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281 free(fmt->fmt.adpcm.aCoeff);
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282 } /* free_fmt_adpcm */
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283
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284
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285 /*
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286 * Read in a the adpcm-specific info from disk. This makes this process
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287 * safe regardless of the processor's byte order or how the fmt_t
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288 * structure is packed.
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289 */
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290 static int read_fmt_adpcm(SDL_RWops *rw, fmt_t *fmt)
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291 {
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292 size_t i;
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293
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294 fmt->fmt.adpcm.aCoeff = NULL;
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295 fmt->free = free_fmt_adpcm;
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296 fmt->read_sample = read_sample_fmt_adpcm;
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297
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298 if (SDL_RWread(rw, &fmt->fmt.adpcm.cbSize,
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diff changeset
299 sizeof (fmt->fmt.adpcm.cbSize), 1) != 1)
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diff changeset
300 {
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301 return(0);
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diff changeset
302 } /* if */
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diff changeset
303 fmt->fmt.adpcm.cbSize = SDL_SwapLE16(fmt->fmt.adpcm.cbSize);
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diff changeset
304
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diff changeset
305 if (SDL_RWread(rw, &fmt->fmt.adpcm.wSamplesPerBlock,
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diff changeset
306 sizeof (fmt->fmt.adpcm.wSamplesPerBlock), 1) != 1)
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diff changeset
307 {
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diff changeset
308 return(0);
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diff changeset
309 } /* if */
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diff changeset
310 fmt->fmt.adpcm.wSamplesPerBlock = SDL_SwapLE16(fmt->fmt.adpcm.wSamplesPerBlock);
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diff changeset
311
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diff changeset
312 if (SDL_RWread(rw, &fmt->fmt.adpcm.wNumCoef,
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diff changeset
313 sizeof (fmt->fmt.adpcm.wNumCoef), 1) != 1)
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diff changeset
314 {
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diff changeset
315 return(0);
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diff changeset
316 } /* if */
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diff changeset
317 fmt->fmt.adpcm.wNumCoef = SDL_SwapLE16(fmt->fmt.adpcm.wNumCoef);
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diff changeset
318
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diff changeset
319 i = sizeof (ADPCMCOEFSET) * fmt->fmt.adpcm.wNumCoef;
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diff changeset
320 fmt->fmt.adpcm.aCoeff = (ADPCMCOEFSET *) malloc(i);
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diff changeset
321 BAIL_IF_MACRO(fmt->fmt.adpcm.aCoeff == NULL, ERR_OUT_OF_MEMORY, 0);
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diff changeset
322
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
323 for (i = 0; i < fmt->fmt.adpcm.wNumCoef; i++)
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parents: 106
diff changeset
324 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
325 if (SDL_RWread(rw, &fmt->fmt.adpcm.aCoeff[i].iCoef1,
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
326 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
327 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
328 return(0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
329 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
330
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
331 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
332 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
333 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
334 return(0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
335 } /* if */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
336 } /* for */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
337
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
338 return(1);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
339 } /* read_fmt_adpcm */
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
340
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
341
178
bdbe09014724 Minor tweaks and such.
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parents: 149
diff changeset
342
124
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
343 /*****************************************************************************
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
344 * Everything else... *
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
345 *****************************************************************************/
e46e31fdecfd Restructured to handle multiple formats.
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diff changeset
346
178
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parents: 149
diff changeset
347 static int WAV_init(void)
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parents: 149
diff changeset
348 {
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parents: 149
diff changeset
349 return(1); /* always succeeds. */
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parents: 149
diff changeset
350 } /* WAV_init */
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parents: 149
diff changeset
351
bdbe09014724 Minor tweaks and such.
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parents: 149
diff changeset
352
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
353 static void WAV_quit(void)
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parents: 149
diff changeset
354 {
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Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
355 /* it's a no-op. */
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
356 } /* WAV_quit */
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
357
124
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
358
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
359 static int read_fmt(SDL_RWops *rw, fmt_t *fmt)
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 /* 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
362 switch (fmt->wFormatTag)
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
363 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
364 case FMT_NORMAL:
178
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
365 SNDDBG(("WAV: Appears to be uncompressed audio.\n"));
124
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
366 return(read_fmt_normal(rw, fmt));
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
367
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
368 case FMT_ADPCM:
178
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
369 SNDDBG(("WAV: Appears to be ADPCM compressed audio.\n"));
124
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
370 return(read_fmt_adpcm(rw, fmt));
178
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
371
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
372 /* add other types here. */
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
373
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
374 default:
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
375 SNDDBG(("WAV: Format %lu is unknown.\n",
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
376 (unsigned int) fmt->wFormatTag));
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
377 Sound_SetError("WAV: Unsupported format");
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
378 return(0); /* not supported whatsoever. */
124
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
379 } /* switch */
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
380
178
bdbe09014724 Minor tweaks and such.
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parents: 149
diff changeset
381 assert(0); /* shouldn't hit this point. */
bdbe09014724 Minor tweaks and such.
Ryan C. Gordon <icculus@icculus.org>
parents: 149
diff changeset
382 return(0);
124
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
383 } /* read_fmt */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
384
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
385
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
386 /*
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
387 * 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
388 */
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
389 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
390 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
391 Sint32 siz = 0;
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
392 Uint32 _id = 0;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
393
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
394 while (1)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
395 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
396 BAIL_IF_MACRO(SDL_RWread(rw, &_id, sizeof (_id), 1) != 1, NULL, 0);
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
397 if (SDL_SwapLE32(_id) == id)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
398 return(1);
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 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
401 siz = SDL_SwapLE32(siz);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
402 assert(siz > 0);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
403 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
404 } /* while */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
405
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
406 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
407 } /* find_chunk */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
408
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 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
411 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
412 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
413 SDL_RWops *rw = internal->rw;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
414 data_t d;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
415 wav_t *w;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
416
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
417 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
418 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
419 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
420 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
421 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
422
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
423 sample->actual.channels = (Uint8) fmt->wChannels;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
424 sample->actual.rate = fmt->dwSamplesPerSec;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
425 if (fmt->wBitsPerSample <= 8)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
426 sample->actual.format = AUDIO_U8;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
427 else if (fmt->wBitsPerSample <= 16)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
428 sample->actual.format = AUDIO_S16LSB;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
429 else
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
430 BAIL_MACRO("WAV: Unsupported sample size.", 0);
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 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
433 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
434 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
435
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
436 w = (wav_t *) malloc(sizeof(wav_t));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
437 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
438 w->fmt = fmt;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
439 w->bytesLeft = d.chunkSize;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
440 internal->decoder_private = (void *) w;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
441
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
442 sample->flags = SOUND_SAMPLEFLAG_NONE;
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 SNDDBG(("WAV: Accepting data stream.\n"));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
445 return(1); /* we'll handle this data. */
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
446 } /* WAV_open_internal */
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
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
449 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
450 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
451 int rc;
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 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
454 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
455 memset(fmt, '\0', sizeof (fmt_t));
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
456
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
457 rc = WAV_open_internal(sample, ext, fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
458 if (!rc)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
459 {
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
460 if (fmt->free != NULL)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
461 fmt->free(fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
462 free(fmt);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
463 } /* if */
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 return(rc);
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
466 } /* WAV_open */
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
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
469 static void WAV_close(Sound_Sample *sample)
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
470 {
e46e31fdecfd Restructured to handle multiple formats.
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parents: 106
diff changeset
471 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
parents: 106
diff changeset
472 wav_t *w = (wav_t *) internal->decoder_private;
e46e31fdecfd Restructured to handle multiple formats.
Ryan C. Gordon <icculus@icculus.org>
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473 w->fmt->free(w->fmt);
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474 free(w->fmt);
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475 free(w);
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476 } /* WAV_close */
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477
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478
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479 static Uint32 WAV_read(Sound_Sample *sample)
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480 {
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481 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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482 wav_t *w = (wav_t *) internal->decoder_private;
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483 return(w->fmt->read_sample(sample));
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484 } /* WAV_read */
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485
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486 #endif /* SOUND_SUPPORTS_WAV */
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487
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488 /* end of wav.c ... */
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489