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4
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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 * This file implements the core API, which is relatively simple.
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22 * The real meat of SDL_sound is in the decoders directory.
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23 *
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24 * Documentation is in SDL_sound.h ... It's verbose, honest. :)
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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
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32 #include <stdio.h>
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33 #include <stdlib.h>
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34 #include <string.h>
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35 #include <assert.h>
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36 #include <ctype.h>
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37
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38 #include "SDL.h"
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39 #include "SDL_sound.h"
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40
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41 #define __SDL_SOUND_INTERNAL__
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42 #include "SDL_sound_internal.h"
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43
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44
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45 /* The various decoder drivers... */
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46
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47 #if (defined SOUND_SUPPORTS_VOC)
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48 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC;
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49 #endif
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50
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51 #if (defined SOUND_SUPPORTS_RAW)
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52 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_RAW;
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53 #endif
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54
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55 static const Sound_DecoderFunctions *decoderFuncs[] =
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56 {
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57 #if (defined SOUND_SUPPORTS_VOC)
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58 &__Sound_DecoderFunctions_VOC,
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59 #endif
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60
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61 #if (defined SOUND_SUPPORTS_RAW)
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62 &__Sound_DecoderFunctions_RAW,
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63 #endif
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64
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65 NULL
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66 };
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67
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68
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69
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70 /* General SDL_sound state ... */
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71
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72 static int initialized = 0;
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73 static Sound_Sample *samplesList = NULL; /* this is a linked list. */
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74 static const Sound_DecoderInfo **available_decoders = NULL;
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75
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76
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77 /* functions ... */
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78
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79 void Sound_GetLinkedVersion(Sound_Version *ver)
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80 {
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81 if (ver != NULL)
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82 {
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83 ver->major = SOUND_VER_MAJOR;
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84 ver->minor = SOUND_VER_MINOR;
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85 ver->patch = SOUND_VER_PATCH;
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86 } /* if */
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87 } /* Sound_GetLinkedVersion */
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88
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89
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90 int Sound_Init(void)
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91 {
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92 size_t i;
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93 BAIL_IF_MACRO(initialized, ERR_IS_INITIALIZED, 0);
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94 samplesList = NULL;
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95
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96 SDL_Init(SDL_INIT_AUDIO);
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97
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98 for (i = 0; decoderFuncs[i] != NULL; i++)
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99 ; /* do nothing. */
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100
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101 i++;
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102 available_decoders = (const Sound_DecoderInfo **)
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103 malloc(i * sizeof (Sound_DecoderInfo *));
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104 BAIL_IF_MACRO(available_decoders == NULL, ERR_OUT_OF_MEMORY, 0);
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105
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106 for (i = 0; decoderFuncs[i] != NULL; i++)
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107 available_decoders[i] = &decoderFuncs[i]->info;
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108
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109 initialized = 1;
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110 return(1);
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111 } /* Sound_Init */
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112
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113
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114 int Sound_Quit(void)
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115 {
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116 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);
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117
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118 while (((volatile Sound_Sample *) samplesList) != NULL)
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119 Sound_FreeSample(samplesList);
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120
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121 if (available_decoders != NULL)
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122 free(available_decoders);
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123 available_decoders = NULL;
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124
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125 initialized = 0;
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126
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127 return(1);
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128 } /* Sound_Quit */
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129
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130
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131 const Sound_DecoderInfo **Sound_AvailableDecoders(void)
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132 {
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133 return(available_decoders); /* READ. ONLY. */
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134 } /* Sound_AvailableDecoders */
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135
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136
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137 const char *Sound_GetError(void)
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138 {
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139 return(SDL_GetError());
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140 } /* Sound_GetError */
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141
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142
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143 void Sound_ClearError(void)
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144 {
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145 SDL_ClearError();
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146 } /* Sound_ClearError */
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147
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148
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149 /*
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150 * This is declared in the internal header.
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151 */
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152 void Sound_SetError(const char *err)
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153 {
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154 if (err != NULL)
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155 SDL_SetError(err);
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156 } /* Sound_SetError */
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157
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158
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159 /*
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160 * -ansi and -pedantic flags prevent use of strcasecmp() on Linux, and
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161 * I honestly don't want to mess around with figuring out if a given
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162 * platform has "strcasecmp", "stricmp", or
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163 * "compare_two_damned_strings_case_insensitive", which I hear is in the
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164 * next release of Carbon. :) This is exported so decoders may use it if
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165 * they like.
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166 */
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167 int __Sound_strcasecmp(const char *x, const char *y)
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168 {
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169 int ux, uy;
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170
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171 do
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172 {
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173 ux = toupper((int) *x);
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174 uy = toupper((int) *y);
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175 if (ux > uy)
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176 return(1);
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177 else if (ux < uy)
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178 return(-1);
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179 x++;
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180 y++;
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181 } while ((ux) && (uy));
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182
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183 return(0);
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184 } /* __Sound_strcasecmp */
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185
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186
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187 /*
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188 * Allocate a Sound_Sample, and fill in most of its fields. Those that need
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189 * to be filled in later, by a decoder, will be initialized to zero.
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190 */
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191 static Sound_Sample *alloc_sample(SDL_RWops *rw, Sound_AudioInfo *desired,
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192 Uint32 bufferSize)
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193 {
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194 Sound_Sample *retval = malloc(sizeof (Sound_Sample));
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195 Sound_SampleInternal *internal = malloc(sizeof (Sound_SampleInternal));
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196 if ((retval == NULL) || (internal == NULL))
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197 {
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198 Sound_SetError(ERR_OUT_OF_MEMORY);
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199 if (retval)
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200 free(retval);
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201 if (internal)
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202 free(internal);
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203
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204 return(NULL);
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205 } /* if */
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206
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207 memset(retval, '\0', sizeof (Sound_Sample));
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208 memset(internal, '\0', sizeof (Sound_SampleInternal));
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209
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210 assert(bufferSize > 0);
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211 retval->buffer = malloc(bufferSize); /* pure ugly. */
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212 if (!retval->buffer)
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213 {
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214 Sound_SetError(ERR_OUT_OF_MEMORY);
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215 free(internal);
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216 free(retval);
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217 return(NULL);
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218 } /* if */
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219 memset(retval->buffer, '\0', bufferSize);
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220 retval->buffer_size = bufferSize;
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221
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222 if (desired != NULL)
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223 memcpy(&retval->desired, desired, sizeof (Sound_AudioInfo));
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224
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225 internal->rw = rw;
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226 retval->opaque = internal;
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227 return(retval);
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228 } /* alloc_sample */
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229
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230
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231 /*
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232 * The bulk of the Sound_NewSample() work is done here...
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233 * Ask the specified decoder to handle the data in (rw), and if
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234 * so, construct the Sound_Sample. Otherwise, try to wind (rw)'s stream
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235 * back to where it was, and return false.
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236 *
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237 * !!! FIXME: This is big, ugly, nasty, and smelly.
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238 */
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239 static int init_sample(const Sound_DecoderFunctions *funcs,
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240 Sound_Sample *sample, const char *ext,
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241 Sound_AudioInfo *_desired)
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242 {
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243 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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244 int pos = SDL_RWtell(internal->rw); /* !!! FIXME: Int? Really? */
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245 Sound_AudioInfo desired;
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246
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247 /* fill in the funcs for this decoder... */
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248 sample->decoder = &funcs->info;
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249 internal->funcs = funcs;
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250 if (!funcs->open(sample, ext))
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251 {
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252 SDL_RWseek(internal->rw, pos, SEEK_SET); /* set for next try... */
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253 return(0);
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254 } /* if */
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255
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256 /* success; we've got a decoder! */
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257
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258 /* Now we need to set up the conversion buffer... */
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259
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260 memcpy(&desired, (_desired != NULL) ? _desired : &sample->actual,
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261 sizeof (Sound_AudioInfo));
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262
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263 if (SDL_BuildAudioCVT(&internal->sdlcvt,
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264 sample->actual.format,
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265 sample->actual.channels,
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266 (int) sample->actual.rate, /* !!! FIXME: Int? Really? */
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267 desired.format,
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268 desired.channels,
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269 (int) desired.rate) == -1) /* !!! FIXME: Int? Really? */
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270 {
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271 Sound_SetError(SDL_GetError());
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272 funcs->close(sample);
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273 SDL_RWseek(internal->rw, pos, SEEK_SET); /* set for next try... */
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274 return(0);
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275 } /* if */
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276
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277 if (internal->sdlcvt.len_mult > 1)
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278 {
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279 void *rc = realloc(sample->buffer,
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280 sample->buffer_size * internal->sdlcvt.len_mult);
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281 if (rc == NULL)
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282 {
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283 funcs->close(sample);
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284 SDL_RWseek(internal->rw, pos, SEEK_SET); /* set for next try... */
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285 return(0);
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286 } /* if */
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287
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288 sample->buffer = rc;
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289 } /* if */
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290
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291 /* these pointers are all one and the same. */
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292 memcpy(&sample->desired, &desired, sizeof (Sound_AudioInfo));
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293 internal->sdlcvt.buf = internal->buffer = sample->buffer;
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294 internal->buffer_size = sample->buffer_size / internal->sdlcvt.len_mult;
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295 internal->sdlcvt.len = internal->buffer_size;
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296
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297 /* Prepend our new Sound_Sample to the samplesList... */
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298 if (samplesList != NULL)
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299 {
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300 internal->next = samplesList;
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301 if (samplesList != NULL)
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302 internal->prev = sample;
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303 } /* if */
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304 samplesList = sample;
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305
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306 return(1);
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307 } /* init_sample */
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308
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309
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310 Sound_Sample *Sound_NewSample(SDL_RWops *rw, const char *ext,
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311 Sound_AudioInfo *desired, Uint32 bSize)
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312 {
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313 size_t i;
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314 Sound_Sample *retval;
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315
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316 /* sanity checks. */
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317 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, NULL);
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318 BAIL_IF_MACRO(rw == NULL, ERR_INVALID_ARGUMENT, NULL);
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319
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320 retval = alloc_sample(rw, desired, bSize);
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321 if (!retval)
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322 return(NULL); /* alloc_sample() sets error message... */
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323
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324 if (ext != NULL)
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325 {
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326 for (i = 0; decoderFuncs[i] != NULL; i++)
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327 {
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328 const char *decoderExt = decoderFuncs[i]->info.extension;
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329 if (__Sound_strcasecmp(decoderExt, ext) == 0)
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330 {
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331 if (init_sample(decoderFuncs[i], retval, ext, desired))
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332 return(retval);
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333 } /* if */
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334 } /* for */
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335 } /* if */
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336
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337 /* no direct extension match? Try everything we've got... */
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338 for (i = 0; decoderFuncs[i] != NULL; i++)
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339 {
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340 if (init_sample(decoderFuncs[i], retval, ext, desired))
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341 return(retval);
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342 } /* for */
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343
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344 /* nothing could handle the sound data... */
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345 free(retval->opaque);
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346 if (retval->buffer != NULL)
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347 free(retval->buffer);
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348 free(retval);
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349 SDL_RWclose(rw);
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350 Sound_SetError(ERR_UNSUPPORTED_FORMAT);
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351 return(NULL);
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352 } /* Sound_NewSample */
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353
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354
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355 Sound_Sample *Sound_NewSampleFromFile(const char *filename,
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356 Sound_AudioInfo *desired,
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357 Uint32 bufferSize)
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358 {
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359 const char *ext;
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360 SDL_RWops *rw;
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361
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362 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, NULL);
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363 BAIL_IF_MACRO(filename == NULL, ERR_INVALID_ARGUMENT, NULL);
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364
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365 ext = strrchr(filename, '.');
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366 rw = SDL_RWFromFile(filename, "rb");
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367 BAIL_IF_MACRO(rw == NULL, SDL_GetError(), NULL);
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368
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369 if (ext != NULL)
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370 ext++;
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371
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372 return(Sound_NewSample(rw, ext, desired, bufferSize));
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373 } /* Sound_NewSampleFromFile */
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374
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375
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376 void Sound_FreeSample(Sound_Sample *sample)
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377 {
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378 Sound_SampleInternal *internal;
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379
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380 if (!initialized)
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381 {
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382 Sound_SetError(ERR_NOT_INITIALIZED);
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383 return;
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384 } /* if */
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385
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386 if (sample == NULL)
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387 {
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388 Sound_SetError(ERR_INVALID_ARGUMENT);
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389 return;
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390 } /* if */
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391
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392 internal = (Sound_SampleInternal *) sample->opaque;
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393
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394 internal->funcs->close(sample);
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395
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396 /* update the samplesList... */
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397 if (internal->prev != NULL)
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398 {
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399 Sound_SampleInternal *prevInternal;
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400 prevInternal = (Sound_SampleInternal *) internal->prev->opaque;
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401 prevInternal->next = internal->next;
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402 } /* if */
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403 else
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404 {
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405 assert(samplesList == sample);
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406 samplesList = internal->next;
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407 } /* else */
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408
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409 if (internal->next != NULL)
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410 {
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411 Sound_SampleInternal *nextInternal;
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412 nextInternal = (Sound_SampleInternal *) internal->next->opaque;
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413 nextInternal->prev = internal->prev;
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414 } /* if */
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415
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416 /* nuke it... */
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417 if (internal->rw != NULL) /* this condition is a "just in case" thing. */
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418 SDL_RWclose(internal->rw);
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419 assert(internal->buffer != NULL);
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420 if (internal->buffer != sample->buffer)
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421 free(internal->buffer);
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422 free(internal);
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423 if (sample->buffer != NULL)
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424 free(sample->buffer);
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425 free(sample);
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426 } /* Sound_FreeSample */
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427
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428
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429 int Sound_SetBufferSize(Sound_Sample *sample, Uint32 newSize)
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430 {
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431 void *newBuf = NULL;
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432 Sound_SampleInternal *internal = NULL;
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433
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434 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);
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435 BAIL_IF_MACRO(sample == NULL, ERR_INVALID_ARGUMENT, 0);
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436 internal = ((Sound_SampleInternal *) sample->opaque);
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437 newBuf = realloc(sample->buffer, newSize * internal->sdlcvt.len_mult);
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438 BAIL_IF_MACRO(newBuf == NULL, ERR_OUT_OF_MEMORY, 0);
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439
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440 internal->sdlcvt.buf = internal->buffer = sample->buffer = newBuf;
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441 sample->buffer_size = newSize;
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442 internal->buffer_size = newSize / internal->sdlcvt.len_mult;
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443 internal->sdlcvt.len = internal->buffer_size;
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444
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445 return(1);
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446 } /* Sound_SetBufferSize */
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447
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448
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449 Uint32 Sound_Decode(Sound_Sample *sample)
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450 {
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|
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451 Sound_SampleInternal *internal = NULL;
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452 Uint32 retval = 0;
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453
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454 /* a boatload of sanity checks... */
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455 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);
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456 BAIL_IF_MACRO(sample == NULL, ERR_INVALID_ARGUMENT, 0);
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457 BAIL_IF_MACRO(sample->flags & SOUND_SAMPLEFLAG_ERROR, ERR_PREV_ERROR, 0);
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458 BAIL_IF_MACRO(sample->flags & SOUND_SAMPLEFLAG_EOF, ERR_PREV_EOF, 0);
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459
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460 internal = (Sound_SampleInternal *) sample->opaque;
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461
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462 assert(sample->buffer != NULL);
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463 assert(sample->buffer_size > 0);
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464 assert(internal->buffer != NULL);
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|
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465 assert(internal->buffer_size > 0);
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|
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466
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467 /* reset EAGAIN. Decoder can flip it back on if it needs to. */
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|
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468 sample->flags &= !SOUND_SAMPLEFLAG_EAGAIN;
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|
|
469
|
|
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470 retval = internal->funcs->read(sample);
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|
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471 if (internal->sdlcvt.needed)
|
|
|
472 {
|
|
|
473 internal->sdlcvt.len = retval;
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|
|
474 SDL_ConvertAudio(&internal->sdlcvt);
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|
|
475 retval *= internal->sdlcvt.len_mult;
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|
|
476 } /* if */
|
|
|
477
|
|
|
478 return(retval);
|
|
|
479 } /* Sound_Decode */
|
|
|
480
|
|
|
481
|
|
|
482 Uint32 Sound_DecodeAll(Sound_Sample *sample)
|
|
|
483 {
|
|
|
484 Sound_SampleInternal *internal = NULL;
|
|
|
485 void *buf = NULL;
|
|
|
486 Uint32 newBufSize = 0;
|
|
|
487
|
|
|
488 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);
|
|
|
489
|
|
|
490 internal = (Sound_SampleInternal *) sample->opaque;
|
|
|
491
|
|
|
492 while ( ((sample->flags & SOUND_SAMPLEFLAG_EOF) == 0) &&
|
|
|
493 ((sample->flags & SOUND_SAMPLEFLAG_ERROR) == 0) )
|
|
|
494 {
|
|
|
495 void *ptr = realloc(buf, newBufSize + sample->buffer_size);
|
|
|
496 if (ptr == NULL)
|
|
|
497 {
|
|
|
498 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
|
|
|
499 Sound_SetError(ERR_OUT_OF_MEMORY);
|
|
|
500 } /* if */
|
|
|
501 else
|
|
|
502 {
|
|
|
503 Uint32 br = Sound_Decode(sample);
|
|
|
504 memcpy( ((char *) buf) + newBufSize, sample->buffer, br );
|
|
|
505 newBufSize += br;
|
|
|
506 } /* else */
|
|
|
507 } /* while */
|
|
|
508
|
|
|
509 free(sample->buffer);
|
|
|
510 sample->buffer = internal->buffer = internal->sdlcvt.buf = buf;
|
|
|
511 sample->buffer_size = newBufSize;
|
|
|
512 internal->buffer_size = newBufSize / internal->sdlcvt.len_mult;
|
|
|
513 internal->sdlcvt.len_mult = internal->buffer_size;
|
|
|
514
|
|
|
515 return(newBufSize);
|
|
|
516 } /* Sound_DecodeAll */
|
|
|
517
|
|
|
518
|
|
|
519 /* end of SDL_sound.c ... */
|
|
|
520
|
