Mercurial > SDL_sound_CoreAudio
annotate SDL_sound.c @ 102:72502bed0aef
Added SHN entry.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Wed, 03 Oct 2001 18:01:15 +0000 |
| parents | dfdf7b4e05bd |
| children | 427541211bfd |
| rev | line source |
|---|---|
| 4 | 1 /* |
| 2 * SDL_sound -- An abstract sound format decoding API. | |
| 3 * Copyright (C) 2001 Ryan C. Gordon. | |
| 4 * | |
| 5 * This library is free software; you can redistribute it and/or | |
| 6 * modify it under the terms of the GNU Lesser General Public | |
| 7 * License as published by the Free Software Foundation; either | |
| 8 * version 2.1 of the License, or (at your option) any later version. | |
| 9 * | |
| 10 * This library is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 * Lesser General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU Lesser General Public | |
| 16 * License along with this library; if not, write to the Free Software | |
| 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 */ | |
| 19 | |
| 20 /** | |
| 21 * This file implements the core API, which is relatively simple. | |
| 22 * The real meat of SDL_sound is in the decoders directory. | |
| 23 * | |
| 24 * Documentation is in SDL_sound.h ... It's verbose, honest. :) | |
| 25 * | |
| 26 * Please see the file LICENSE in the source's root directory. | |
| 27 * | |
| 28 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 29 */ | |
| 30 | |
| 31 | |
| 32 #include <stdio.h> | |
| 33 #include <stdlib.h> | |
| 34 #include <string.h> | |
| 35 #include <assert.h> | |
| 36 #include <ctype.h> | |
| 37 | |
| 38 #include "SDL.h" | |
| 39 #include "SDL_sound.h" | |
| 40 | |
| 41 #define __SDL_SOUND_INTERNAL__ | |
| 42 #include "SDL_sound_internal.h" | |
| 43 | |
| 44 | |
| 45 /* The various decoder drivers... */ | |
| 46 | |
|
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47 #if (defined SOUND_SUPPORTS_MP3) |
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48 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_MP3; |
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49 #endif |
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50 |
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51 #if (defined SOUND_SUPPORTS_MOD) |
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52 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_MOD; |
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53 #endif |
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54 |
| 20 | 55 #if (defined SOUND_SUPPORTS_WAV) |
| 56 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_WAV; | |
| 57 #endif | |
| 58 | |
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59 #if (defined SOUND_SUPPORTS_AIFF) |
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60 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_AIFF; |
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61 #endif |
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62 |
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63 #if (defined SOUND_SUPPORTS_OGG) |
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64 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_OGG; |
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65 #endif |
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66 |
| 4 | 67 #if (defined SOUND_SUPPORTS_VOC) |
| 68 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC; | |
| 69 #endif | |
| 70 | |
| 71 #if (defined SOUND_SUPPORTS_RAW) | |
| 72 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_RAW; | |
| 73 #endif | |
| 74 | |
| 102 | 75 #if (defined SOUND_SUPPORTS_SHN) |
| 76 extern const Sound_DecoderFunctions __Sound_DecoderFunctions_SHN; | |
| 77 #endif | |
| 78 | |
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79 |
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80 |
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81 typedef struct |
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82 { |
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83 int available; |
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84 const Sound_DecoderFunctions *funcs; |
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85 } decoder_element; |
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86 |
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87 static decoder_element decoders[] = |
| 4 | 88 { |
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89 #if (defined SOUND_SUPPORTS_MP3) |
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90 { 0, &__Sound_DecoderFunctions_MP3 }, |
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91 #endif |
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92 |
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93 #if (defined SOUND_SUPPORTS_MOD) |
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94 { 0, &__Sound_DecoderFunctions_MOD }, |
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95 #endif |
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96 |
| 20 | 97 #if (defined SOUND_SUPPORTS_WAV) |
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98 { 0, &__Sound_DecoderFunctions_WAV }, |
| 20 | 99 #endif |
| 100 | |
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101 #if (defined SOUND_SUPPORTS_AIFF) |
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102 { 0, &__Sound_DecoderFunctions_AIFF }, |
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103 #endif |
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104 |
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105 #if (defined SOUND_SUPPORTS_OGG) |
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106 { 0, &__Sound_DecoderFunctions_OGG }, |
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107 #endif |
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108 |
| 4 | 109 #if (defined SOUND_SUPPORTS_VOC) |
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110 { 0, &__Sound_DecoderFunctions_VOC }, |
| 4 | 111 #endif |
| 112 | |
| 113 #if (defined SOUND_SUPPORTS_RAW) | |
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114 { 0, &__Sound_DecoderFunctions_RAW }, |
| 4 | 115 #endif |
| 102 | 116 |
| 117 #if (defined SOUND_SUPPORTS_SHN) | |
| 118 { 0, &__Sound_DecoderFunctions_SHN }, | |
| 119 #endif | |
| 4 | 120 }; |
| 121 | |
| 122 | |
| 123 | |
| 124 /* General SDL_sound state ... */ | |
| 125 | |
| 126 static int initialized = 0; | |
| 127 static Sound_Sample *samplesList = NULL; /* this is a linked list. */ | |
| 128 static const Sound_DecoderInfo **available_decoders = NULL; | |
| 129 | |
| 130 | |
| 131 /* functions ... */ | |
| 132 | |
| 133 void Sound_GetLinkedVersion(Sound_Version *ver) | |
| 134 { | |
| 135 if (ver != NULL) | |
| 136 { | |
| 137 ver->major = SOUND_VER_MAJOR; | |
| 138 ver->minor = SOUND_VER_MINOR; | |
| 139 ver->patch = SOUND_VER_PATCH; | |
| 140 } /* if */ | |
| 141 } /* Sound_GetLinkedVersion */ | |
| 142 | |
| 143 | |
| 144 int Sound_Init(void) | |
| 145 { | |
| 146 size_t i; | |
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147 size_t pos = 0; |
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148 size_t total = sizeof (decoders) / sizeof (decoders[0]); |
| 4 | 149 BAIL_IF_MACRO(initialized, ERR_IS_INITIALIZED, 0); |
| 150 samplesList = NULL; | |
| 151 | |
| 152 SDL_Init(SDL_INIT_AUDIO); | |
| 153 | |
| 154 available_decoders = (const Sound_DecoderInfo **) | |
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155 malloc((total + 1) * sizeof (Sound_DecoderInfo *)); |
| 4 | 156 BAIL_IF_MACRO(available_decoders == NULL, ERR_OUT_OF_MEMORY, 0); |
| 157 | |
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158 for (i = 0; i < total; i++) |
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159 { |
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160 decoders[i].available = decoders[i].funcs->init(); |
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161 if (decoders[i].available) |
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162 { |
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163 available_decoders[pos] = &(decoders[i].funcs->info); |
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164 pos++; |
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165 } /* if */ |
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166 } /* for */ |
| 4 | 167 |
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168 available_decoders[pos] = NULL; |
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169 |
| 4 | 170 initialized = 1; |
| 171 return(1); | |
| 172 } /* Sound_Init */ | |
| 173 | |
| 174 | |
| 175 int Sound_Quit(void) | |
| 176 { | |
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177 size_t total = sizeof (decoders) / sizeof (decoders[0]); |
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178 size_t i; |
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179 |
| 4 | 180 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0); |
| 181 | |
| 182 while (((volatile Sound_Sample *) samplesList) != NULL) | |
| 183 Sound_FreeSample(samplesList); | |
| 184 | |
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185 for (i = 0; i < total; i++) |
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186 { |
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187 if (decoders[i].available) |
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188 { |
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189 decoders[i].funcs->quit(); |
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190 decoders[i].available = 0; |
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191 } /* if */ |
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192 } /* for */ |
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193 |
| 4 | 194 if (available_decoders != NULL) |
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195 free((void *) available_decoders); |
| 4 | 196 available_decoders = NULL; |
| 197 | |
| 198 initialized = 0; | |
| 199 | |
| 200 return(1); | |
| 201 } /* Sound_Quit */ | |
| 202 | |
| 203 | |
| 204 const Sound_DecoderInfo **Sound_AvailableDecoders(void) | |
| 205 { | |
| 206 return(available_decoders); /* READ. ONLY. */ | |
| 207 } /* Sound_AvailableDecoders */ | |
| 208 | |
| 209 | |
| 210 const char *Sound_GetError(void) | |
| 211 { | |
| 212 return(SDL_GetError()); | |
| 213 } /* Sound_GetError */ | |
| 214 | |
| 215 | |
| 216 void Sound_ClearError(void) | |
| 217 { | |
| 218 SDL_ClearError(); | |
| 219 } /* Sound_ClearError */ | |
| 220 | |
| 221 | |
| 222 /* | |
| 223 * This is declared in the internal header. | |
| 224 */ | |
| 225 void Sound_SetError(const char *err) | |
| 226 { | |
| 227 if (err != NULL) | |
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228 { |
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229 SNDDBG(("Sound_SetError(\"%s\");\n", err)); |
| 4 | 230 SDL_SetError(err); |
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231 } /* if */ |
| 4 | 232 } /* Sound_SetError */ |
| 233 | |
| 234 | |
| 235 /* | |
| 236 * -ansi and -pedantic flags prevent use of strcasecmp() on Linux, and | |
| 237 * I honestly don't want to mess around with figuring out if a given | |
| 238 * platform has "strcasecmp", "stricmp", or | |
| 239 * "compare_two_damned_strings_case_insensitive", which I hear is in the | |
| 240 * next release of Carbon. :) This is exported so decoders may use it if | |
| 241 * they like. | |
| 242 */ | |
| 243 int __Sound_strcasecmp(const char *x, const char *y) | |
| 244 { | |
| 245 int ux, uy; | |
| 246 | |
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247 if (x == y) /* same pointer? Both NULL? */ |
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248 return(0); |
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249 |
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250 if (x == NULL) |
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251 return(-1); |
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252 |
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253 if (y == NULL) |
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254 return(1); |
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255 |
| 4 | 256 do |
| 257 { | |
| 258 ux = toupper((int) *x); | |
| 259 uy = toupper((int) *y); | |
| 260 if (ux > uy) | |
| 261 return(1); | |
| 262 else if (ux < uy) | |
| 263 return(-1); | |
| 264 x++; | |
| 265 y++; | |
| 266 } while ((ux) && (uy)); | |
| 267 | |
| 268 return(0); | |
| 269 } /* __Sound_strcasecmp */ | |
| 270 | |
| 271 | |
| 272 /* | |
| 273 * Allocate a Sound_Sample, and fill in most of its fields. Those that need | |
| 274 * to be filled in later, by a decoder, will be initialized to zero. | |
| 275 */ | |
| 276 static Sound_Sample *alloc_sample(SDL_RWops *rw, Sound_AudioInfo *desired, | |
| 277 Uint32 bufferSize) | |
| 278 { | |
| 279 Sound_Sample *retval = malloc(sizeof (Sound_Sample)); | |
| 280 Sound_SampleInternal *internal = malloc(sizeof (Sound_SampleInternal)); | |
| 281 if ((retval == NULL) || (internal == NULL)) | |
| 282 { | |
| 283 Sound_SetError(ERR_OUT_OF_MEMORY); | |
| 284 if (retval) | |
| 285 free(retval); | |
| 286 if (internal) | |
| 287 free(internal); | |
| 288 | |
| 289 return(NULL); | |
| 290 } /* if */ | |
| 291 | |
| 292 memset(retval, '\0', sizeof (Sound_Sample)); | |
| 293 memset(internal, '\0', sizeof (Sound_SampleInternal)); | |
| 294 | |
| 295 assert(bufferSize > 0); | |
| 296 retval->buffer = malloc(bufferSize); /* pure ugly. */ | |
| 297 if (!retval->buffer) | |
| 298 { | |
| 299 Sound_SetError(ERR_OUT_OF_MEMORY); | |
| 300 free(internal); | |
| 301 free(retval); | |
| 302 return(NULL); | |
| 303 } /* if */ | |
| 304 memset(retval->buffer, '\0', bufferSize); | |
| 305 retval->buffer_size = bufferSize; | |
| 306 | |
| 307 if (desired != NULL) | |
| 308 memcpy(&retval->desired, desired, sizeof (Sound_AudioInfo)); | |
| 309 | |
| 310 internal->rw = rw; | |
| 311 retval->opaque = internal; | |
| 312 return(retval); | |
| 313 } /* alloc_sample */ | |
| 314 | |
| 315 | |
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316 #if (defined DEBUG_CHATTER) |
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317 static __inline__ const char *fmt_to_str(Uint16 fmt) |
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318 { |
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319 switch(fmt) |
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320 { |
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321 case AUDIO_U8: |
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322 return("U8"); |
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323 case AUDIO_S8: |
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324 return("S8"); |
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325 case AUDIO_U16LSB: |
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326 return("U16LSB"); |
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327 case AUDIO_S16LSB: |
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328 return("S16LSB"); |
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329 case AUDIO_U16MSB: |
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330 return("U16MSB"); |
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331 case AUDIO_S16MSB: |
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332 return("S16MSB"); |
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333 } /* switch */ |
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334 |
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335 return("Unknown"); |
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336 } /* fmt_to_str */ |
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337 #endif |
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338 |
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339 |
| 4 | 340 /* |
| 341 * The bulk of the Sound_NewSample() work is done here... | |
| 342 * Ask the specified decoder to handle the data in (rw), and if | |
| 343 * so, construct the Sound_Sample. Otherwise, try to wind (rw)'s stream | |
| 344 * back to where it was, and return false. | |
| 345 * | |
| 346 * !!! FIXME: This is big, ugly, nasty, and smelly. | |
| 347 */ | |
| 348 static int init_sample(const Sound_DecoderFunctions *funcs, | |
| 349 Sound_Sample *sample, const char *ext, | |
| 350 Sound_AudioInfo *_desired) | |
| 351 { | |
| 352 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
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353 Sound_AudioInfo desired; |
| 4 | 354 int pos = SDL_RWtell(internal->rw); /* !!! FIXME: Int? Really? */ |
| 355 | |
| 356 /* fill in the funcs for this decoder... */ | |
| 357 sample->decoder = &funcs->info; | |
| 358 internal->funcs = funcs; | |
| 359 if (!funcs->open(sample, ext)) | |
| 360 { | |
| 361 SDL_RWseek(internal->rw, pos, SEEK_SET); /* set for next try... */ | |
| 362 return(0); | |
| 363 } /* if */ | |
| 364 | |
| 365 /* success; we've got a decoder! */ | |
| 366 | |
| 367 /* Now we need to set up the conversion buffer... */ | |
| 368 | |
| 369 memcpy(&desired, (_desired != NULL) ? _desired : &sample->actual, | |
| 370 sizeof (Sound_AudioInfo)); | |
| 371 | |
| 372 if (SDL_BuildAudioCVT(&internal->sdlcvt, | |
| 373 sample->actual.format, | |
| 374 sample->actual.channels, | |
| 375 (int) sample->actual.rate, /* !!! FIXME: Int? Really? */ | |
| 376 desired.format, | |
| 377 desired.channels, | |
| 378 (int) desired.rate) == -1) /* !!! FIXME: Int? Really? */ | |
| 379 { | |
| 380 Sound_SetError(SDL_GetError()); | |
| 381 funcs->close(sample); | |
| 382 SDL_RWseek(internal->rw, pos, SEEK_SET); /* set for next try... */ | |
| 383 return(0); | |
| 384 } /* if */ | |
| 385 | |
| 386 if (internal->sdlcvt.len_mult > 1) | |
| 387 { | |
| 388 void *rc = realloc(sample->buffer, | |
| 389 sample->buffer_size * internal->sdlcvt.len_mult); | |
| 390 if (rc == NULL) | |
| 391 { | |
| 392 funcs->close(sample); | |
| 393 SDL_RWseek(internal->rw, pos, SEEK_SET); /* set for next try... */ | |
| 394 return(0); | |
| 395 } /* if */ | |
| 396 | |
| 397 sample->buffer = rc; | |
| 398 } /* if */ | |
| 399 | |
| 400 /* these pointers are all one and the same. */ | |
| 401 memcpy(&sample->desired, &desired, sizeof (Sound_AudioInfo)); | |
| 402 internal->sdlcvt.buf = internal->buffer = sample->buffer; | |
| 403 internal->buffer_size = sample->buffer_size / internal->sdlcvt.len_mult; | |
| 404 internal->sdlcvt.len = internal->buffer_size; | |
| 405 | |
| 406 /* Prepend our new Sound_Sample to the samplesList... */ | |
| 407 if (samplesList != NULL) | |
| 408 { | |
| 409 internal->next = samplesList; | |
| 410 if (samplesList != NULL) | |
| 411 internal->prev = sample; | |
| 412 } /* if */ | |
| 413 samplesList = sample; | |
| 414 | |
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415 SNDDBG(("New sample DESIRED format: %s format, %d rate, %d channels.\n", |
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416 fmt_to_str(sample->desired.format), |
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417 sample->desired.rate, |
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418 sample->desired.channels)); |
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419 |
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420 SNDDBG(("New sample ACTUAL format: %s format, %d rate, %d channels.\n", |
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421 fmt_to_str(sample->actual.format), |
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422 sample->actual.rate, |
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423 sample->actual.channels)); |
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424 |
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425 SNDDBG(("On-the-fly conversion: %s.\n", |
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426 internal->sdlcvt.needed ? "ENABLED" : "DISABLED")); |
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427 |
| 4 | 428 return(1); |
| 429 } /* init_sample */ | |
| 430 | |
| 431 | |
| 432 Sound_Sample *Sound_NewSample(SDL_RWops *rw, const char *ext, | |
| 433 Sound_AudioInfo *desired, Uint32 bSize) | |
| 434 { | |
|
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435 size_t total = sizeof (decoders) / sizeof (decoders[0]); |
| 4 | 436 size_t i; |
| 437 Sound_Sample *retval; | |
| 438 | |
| 439 /* sanity checks. */ | |
| 440 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, NULL); | |
| 441 BAIL_IF_MACRO(rw == NULL, ERR_INVALID_ARGUMENT, NULL); | |
| 442 | |
| 443 retval = alloc_sample(rw, desired, bSize); | |
| 444 if (!retval) | |
| 445 return(NULL); /* alloc_sample() sets error message... */ | |
| 446 | |
| 447 if (ext != NULL) | |
| 448 { | |
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449 for (i = 0; i < total; i++) |
| 4 | 450 { |
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451 if (decoders[i].available) |
| 4 | 452 { |
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453 const char *decoderExt = decoders[i].funcs->info.extension; |
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454 if (__Sound_strcasecmp(decoderExt, ext) == 0) |
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455 { |
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456 if (init_sample(decoders[i].funcs, retval, ext, desired)) |
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457 return(retval); |
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458 } /* if */ |
| 4 | 459 } /* if */ |
| 460 } /* for */ | |
| 461 } /* if */ | |
| 462 | |
| 463 /* no direct extension match? Try everything we've got... */ | |
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464 for (i = 0; i < total; i++) |
| 4 | 465 { |
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466 if (decoders[i].available) |
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467 { |
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468 if (init_sample(decoders[i].funcs, retval, ext, desired)) |
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469 return(retval); |
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470 } /* if */ |
| 4 | 471 } /* for */ |
| 472 | |
| 473 /* nothing could handle the sound data... */ | |
| 474 free(retval->opaque); | |
| 475 if (retval->buffer != NULL) | |
| 476 free(retval->buffer); | |
| 477 free(retval); | |
| 478 SDL_RWclose(rw); | |
| 479 Sound_SetError(ERR_UNSUPPORTED_FORMAT); | |
| 480 return(NULL); | |
| 481 } /* Sound_NewSample */ | |
| 482 | |
| 483 | |
| 484 Sound_Sample *Sound_NewSampleFromFile(const char *filename, | |
| 485 Sound_AudioInfo *desired, | |
| 486 Uint32 bufferSize) | |
| 487 { | |
| 488 const char *ext; | |
| 489 SDL_RWops *rw; | |
| 490 | |
| 491 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, NULL); | |
| 492 BAIL_IF_MACRO(filename == NULL, ERR_INVALID_ARGUMENT, NULL); | |
| 493 | |
| 494 ext = strrchr(filename, '.'); | |
| 495 rw = SDL_RWFromFile(filename, "rb"); | |
| 496 BAIL_IF_MACRO(rw == NULL, SDL_GetError(), NULL); | |
| 497 | |
| 498 if (ext != NULL) | |
| 499 ext++; | |
| 500 | |
| 501 return(Sound_NewSample(rw, ext, desired, bufferSize)); | |
| 502 } /* Sound_NewSampleFromFile */ | |
| 503 | |
| 504 | |
| 505 void Sound_FreeSample(Sound_Sample *sample) | |
| 506 { | |
| 507 Sound_SampleInternal *internal; | |
| 508 | |
| 509 if (!initialized) | |
| 510 { | |
| 511 Sound_SetError(ERR_NOT_INITIALIZED); | |
| 512 return; | |
| 513 } /* if */ | |
| 514 | |
| 515 if (sample == NULL) | |
| 516 { | |
| 517 Sound_SetError(ERR_INVALID_ARGUMENT); | |
| 518 return; | |
| 519 } /* if */ | |
| 520 | |
| 521 internal = (Sound_SampleInternal *) sample->opaque; | |
| 522 | |
| 523 internal->funcs->close(sample); | |
| 524 | |
| 525 /* update the samplesList... */ | |
| 526 if (internal->prev != NULL) | |
| 527 { | |
| 528 Sound_SampleInternal *prevInternal; | |
| 529 prevInternal = (Sound_SampleInternal *) internal->prev->opaque; | |
| 530 prevInternal->next = internal->next; | |
| 531 } /* if */ | |
| 532 else | |
| 533 { | |
| 534 assert(samplesList == sample); | |
| 535 samplesList = internal->next; | |
| 536 } /* else */ | |
| 537 | |
| 538 if (internal->next != NULL) | |
| 539 { | |
| 540 Sound_SampleInternal *nextInternal; | |
| 541 nextInternal = (Sound_SampleInternal *) internal->next->opaque; | |
| 542 nextInternal->prev = internal->prev; | |
| 543 } /* if */ | |
| 544 | |
| 545 /* nuke it... */ | |
| 546 if (internal->rw != NULL) /* this condition is a "just in case" thing. */ | |
| 547 SDL_RWclose(internal->rw); | |
| 548 assert(internal->buffer != NULL); | |
| 549 if (internal->buffer != sample->buffer) | |
| 550 free(internal->buffer); | |
| 551 free(internal); | |
| 552 if (sample->buffer != NULL) | |
| 553 free(sample->buffer); | |
| 554 free(sample); | |
| 555 } /* Sound_FreeSample */ | |
| 556 | |
| 557 | |
| 558 int Sound_SetBufferSize(Sound_Sample *sample, Uint32 newSize) | |
| 559 { | |
| 560 void *newBuf = NULL; | |
| 561 Sound_SampleInternal *internal = NULL; | |
| 562 | |
| 563 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0); | |
| 564 BAIL_IF_MACRO(sample == NULL, ERR_INVALID_ARGUMENT, 0); | |
| 565 internal = ((Sound_SampleInternal *) sample->opaque); | |
| 566 newBuf = realloc(sample->buffer, newSize * internal->sdlcvt.len_mult); | |
| 567 BAIL_IF_MACRO(newBuf == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 568 | |
| 569 internal->sdlcvt.buf = internal->buffer = sample->buffer = newBuf; | |
| 570 sample->buffer_size = newSize; | |
| 571 internal->buffer_size = newSize / internal->sdlcvt.len_mult; | |
| 572 internal->sdlcvt.len = internal->buffer_size; | |
| 573 | |
| 574 return(1); | |
| 575 } /* Sound_SetBufferSize */ | |
| 576 | |
| 577 | |
| 578 Uint32 Sound_Decode(Sound_Sample *sample) | |
| 579 { | |
| 580 Sound_SampleInternal *internal = NULL; | |
| 581 Uint32 retval = 0; | |
| 582 | |
| 583 /* a boatload of sanity checks... */ | |
| 584 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0); | |
| 585 BAIL_IF_MACRO(sample == NULL, ERR_INVALID_ARGUMENT, 0); | |
| 586 BAIL_IF_MACRO(sample->flags & SOUND_SAMPLEFLAG_ERROR, ERR_PREV_ERROR, 0); | |
| 587 BAIL_IF_MACRO(sample->flags & SOUND_SAMPLEFLAG_EOF, ERR_PREV_EOF, 0); | |
| 588 | |
| 589 internal = (Sound_SampleInternal *) sample->opaque; | |
| 590 | |
| 591 assert(sample->buffer != NULL); | |
| 592 assert(sample->buffer_size > 0); | |
| 593 assert(internal->buffer != NULL); | |
| 594 assert(internal->buffer_size > 0); | |
| 595 | |
| 596 /* reset EAGAIN. Decoder can flip it back on if it needs to. */ | |
| 597 sample->flags &= !SOUND_SAMPLEFLAG_EAGAIN; | |
| 598 retval = internal->funcs->read(sample); | |
|
37
f27bcbcaeab1
Added AIFF entry, and (for now) some multiple-streams-in-one-rwops support.
Ryan C. Gordon <icculus@icculus.org>
parents:
26
diff
changeset
|
599 |
| 4 | 600 if (internal->sdlcvt.needed) |
| 601 { | |
| 602 internal->sdlcvt.len = retval; | |
| 603 SDL_ConvertAudio(&internal->sdlcvt); | |
| 604 retval *= internal->sdlcvt.len_mult; | |
| 605 } /* if */ | |
| 606 | |
| 607 return(retval); | |
| 608 } /* Sound_Decode */ | |
| 609 | |
| 610 | |
| 611 Uint32 Sound_DecodeAll(Sound_Sample *sample) | |
| 612 { | |
| 613 Sound_SampleInternal *internal = NULL; | |
| 614 void *buf = NULL; | |
| 615 Uint32 newBufSize = 0; | |
| 616 | |
| 617 BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0); | |
| 618 | |
| 619 internal = (Sound_SampleInternal *) sample->opaque; | |
| 620 | |
| 621 while ( ((sample->flags & SOUND_SAMPLEFLAG_EOF) == 0) && | |
| 622 ((sample->flags & SOUND_SAMPLEFLAG_ERROR) == 0) ) | |
| 623 { | |
| 624 void *ptr = realloc(buf, newBufSize + sample->buffer_size); | |
| 625 if (ptr == NULL) | |
| 626 { | |
| 627 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 628 Sound_SetError(ERR_OUT_OF_MEMORY); | |
| 629 } /* if */ | |
| 630 else | |
| 631 { | |
| 632 Uint32 br = Sound_Decode(sample); | |
| 633 memcpy( ((char *) buf) + newBufSize, sample->buffer, br ); | |
| 634 newBufSize += br; | |
| 635 } /* else */ | |
| 636 } /* while */ | |
| 637 | |
| 638 free(sample->buffer); | |
| 639 sample->buffer = internal->buffer = internal->sdlcvt.buf = buf; | |
| 640 sample->buffer_size = newBufSize; | |
| 641 internal->buffer_size = newBufSize / internal->sdlcvt.len_mult; | |
| 642 internal->sdlcvt.len_mult = internal->buffer_size; | |
| 643 | |
| 644 return(newBufSize); | |
| 645 } /* Sound_DecodeAll */ | |
| 646 | |
| 647 | |
| 648 /* end of SDL_sound.c ... */ | |
| 649 |