Mercurial > SDL_sound_CoreAudio
annotate decoders/voc.c @ 278:dfe4a46f88f7
Updated.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 14 Mar 2002 16:38:32 +0000 |
| parents | 1bafef18dabf |
| children | ca43129df299 |
| rev | line source |
|---|---|
| 14 | 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 * VOC decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles Creative Labs VOC audio data...this is a legacy format, | |
| 24 * but there's some game ports that could make use of such a decoder. Plus, | |
| 25 * VOC is fairly straightforward to decode, so this is a more complex, but | |
| 26 * still palatable example of an SDL_sound decoder. Y'know, in case the | |
| 27 * RAW decoder didn't do it for you. :) | |
| 28 * | |
| 29 * This code was ripped from a decoder I had written for SDL_mixer, which was | |
| 30 * largely ripped from sox v12.17.1's voc.c. | |
| 31 * | |
| 32 * SDL_mixer: http://www.libsdl.org/projects/SDL_mixer/ | |
| 33 * sox: http://www.freshmeat.net/projects/sox/ | |
| 34 * | |
|
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35 * Please see the file COPYING in the source's root directory. |
| 14 | 36 * |
| 37 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 38 */ | |
| 39 | |
|
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40 #if HAVE_CONFIG_H |
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41 # include <config.h> |
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42 #endif |
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43 |
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44 #ifdef SOUND_SUPPORTS_VOC |
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45 |
| 14 | 46 #include <stdio.h> |
| 47 #include <stdlib.h> | |
| 48 #include <string.h> | |
| 49 #include <assert.h> | |
| 50 | |
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51 #include "SDL_sound.h" |
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52 |
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53 #define __SDL_SOUND_INTERNAL__ |
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54 #include "SDL_sound_internal.h" |
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55 |
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56 static int VOC_init(void); |
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57 static void VOC_quit(void); |
| 14 | 58 static int VOC_open(Sound_Sample *sample, const char *ext); |
| 59 static void VOC_close(Sound_Sample *sample); | |
| 60 static Uint32 VOC_read(Sound_Sample *sample); | |
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61 static int VOC_rewind(Sound_Sample *sample); |
| 14 | 62 |
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63 static const char *extensions_voc[] = { "VOC", NULL }; |
| 14 | 64 const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC = |
| 65 { | |
| 66 { | |
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67 extensions_voc, |
| 14 | 68 "Creative Labs Voice format", |
| 69 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 70 "http://www.icculus.org/SDL_sound/" | |
| 71 }, | |
| 72 | |
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73 VOC_init, /* init() method */ |
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74 VOC_quit, /* quit() method */ |
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75 VOC_open, /* open() method */ |
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76 VOC_close, /* close() method */ |
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77 VOC_read, /* read() method */ |
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78 VOC_rewind /* rewind() method */ |
| 14 | 79 }; |
| 80 | |
| 81 | |
| 82 /* Private data for VOC file */ | |
| 83 typedef struct vocstuff { | |
| 84 Uint32 rest; /* bytes remaining in current block */ | |
| 85 Uint32 rate; /* rate code (byte) of this chunk */ | |
| 86 int silent; /* sound or silence? */ | |
| 87 Uint32 srate; /* rate code (byte) of silence */ | |
| 88 Uint32 blockseek; /* start of current output block */ | |
| 89 Uint32 samples; /* number of samples output */ | |
| 90 Uint32 size; /* word length of data */ | |
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91 Uint8 channels; /* number of sound channels */ |
| 14 | 92 int extended; /* Has an extended block been read? */ |
| 93 Uint32 bufpos; /* byte position in internal->buffer. */ | |
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94 Uint32 start_pos; /* offset to seek to in stream when rewinding. */ |
| 14 | 95 } vs_t; |
| 96 | |
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97 /* Size field */ |
| 14 | 98 /* SJB: note that the 1st 3 are sometimes used as sizeof(type) */ |
| 99 #define ST_SIZE_BYTE 1 | |
| 100 #define ST_SIZE_8BIT 1 | |
| 101 #define ST_SIZE_WORD 2 | |
| 102 #define ST_SIZE_16BIT 2 | |
| 103 #define ST_SIZE_DWORD 4 | |
| 104 #define ST_SIZE_32BIT 4 | |
| 105 #define ST_SIZE_FLOAT 5 | |
| 106 #define ST_SIZE_DOUBLE 6 | |
| 107 #define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */ | |
| 108 | |
| 109 /* Style field */ | |
| 110 #define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */ | |
| 111 #define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */ | |
| 112 #define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */ | |
| 113 #define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */ | |
| 114 #define ST_ENCODING_ADPCM 5 /* Compressed PCM */ | |
| 115 #define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */ | |
| 116 #define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */ | |
| 117 | |
| 118 #define VOC_TERM 0 | |
| 119 #define VOC_DATA 1 | |
| 120 #define VOC_CONT 2 | |
| 121 #define VOC_SILENCE 3 | |
| 122 #define VOC_MARKER 4 | |
| 123 #define VOC_TEXT 5 | |
| 124 #define VOC_LOOP 6 | |
| 125 #define VOC_LOOPEND 7 | |
| 126 #define VOC_EXTENDED 8 | |
| 127 #define VOC_DATA_16 9 | |
| 128 | |
| 129 | |
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130 static int VOC_init(void) |
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131 { |
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132 return(1); /* always succeeds. */ |
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133 } /* VOC_init */ |
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134 |
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135 |
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136 static void VOC_quit(void) |
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137 { |
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138 /* it's a no-op. */ |
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139 } /* VOC_quit */ |
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140 |
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141 |
| 14 | 142 static __inline__ int voc_check_header(SDL_RWops *src) |
| 143 { | |
| 144 /* VOC magic header */ | |
| 145 Uint8 signature[20]; /* "Creative Voice File\032" */ | |
| 146 Uint16 datablockofs; | |
| 147 | |
| 148 if (SDL_RWread(src, signature, sizeof (signature), 1) != 1) | |
| 149 return(0); | |
| 150 | |
| 151 if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) { | |
| 152 Sound_SetError("Unrecognized file type (not VOC)"); | |
| 153 return(0); | |
| 154 } | |
| 155 | |
| 156 /* get the offset where the first datablock is located */ | |
| 157 if (SDL_RWread(src, &datablockofs, sizeof (Uint16), 1) != 1) | |
| 158 return(0); | |
| 159 | |
| 160 datablockofs = SDL_SwapLE16(datablockofs); | |
| 161 | |
| 162 if (SDL_RWseek(src, datablockofs, SEEK_SET) != datablockofs) | |
| 163 return(0); | |
| 164 | |
| 165 return(1); /* success! */ | |
| 166 } /* voc_check_header */ | |
| 167 | |
| 168 /* !!! FIXME : Add a flag to vs_t that distinguishes EOF and Error conditions. */ | |
| 169 | |
| 170 /* Read next block header, save info, leave position at start of data */ | |
| 171 static int voc_get_block(Sound_Sample *sample) | |
| 172 { | |
| 173 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 174 SDL_RWops *src = internal->rw; | |
| 175 vs_t *v = (vs_t *) internal->decoder_private; | |
| 176 Uint8 bits24[3]; | |
| 177 Uint8 uc, block; | |
| 178 Uint32 sblen; | |
| 179 Uint16 new_rate_short; | |
| 180 Uint32 new_rate_long; | |
| 181 Uint8 trash[6]; | |
| 182 Uint16 period; | |
| 183 int i; | |
| 184 | |
| 185 v->silent = 0; | |
| 186 while (v->rest == 0) | |
| 187 { | |
| 188 if (SDL_RWread(src, &block, sizeof (block), 1) != 1) | |
| 189 return 1; /* assume that's the end of the file. */ | |
| 190 | |
| 191 if (block == VOC_TERM) | |
| 192 return 1; | |
| 193 | |
| 194 if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1) | |
| 195 return 1; /* assume that's the end of the file. */ | |
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196 |
| 14 | 197 /* Size is an 24-bit value. Ugh. */ |
| 198 sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) ); | |
| 199 | |
| 200 switch(block) | |
| 201 { | |
| 202 case VOC_DATA: | |
| 203 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 204 return 0; | |
| 205 | |
| 206 /* When DATA block preceeded by an EXTENDED */ | |
| 207 /* block, the DATA blocks rate value is invalid */ | |
| 208 if (!v->extended) | |
| 209 { | |
| 210 if (uc == 0) | |
| 211 { | |
| 212 Sound_SetError("VOC Sample rate is zero?"); | |
| 213 return 0; | |
| 214 } | |
| 215 | |
| 216 if ((v->rate != -1) && (uc != v->rate)) | |
| 217 { | |
| 218 Sound_SetError("VOC sample rate codes differ"); | |
| 219 return 0; | |
| 220 } | |
| 221 | |
| 222 v->rate = uc; | |
| 223 sample->actual.rate = 1000000.0/(256 - v->rate); | |
| 224 v->channels = 1; | |
| 225 } | |
| 226 | |
| 227 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 228 return 0; | |
| 229 | |
| 230 if (uc != 0) | |
| 231 { | |
| 232 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 233 return 0; | |
| 234 } | |
| 235 | |
| 236 v->extended = 0; | |
| 237 v->rest = sblen - 2; | |
| 238 v->size = ST_SIZE_BYTE; | |
| 239 return 1; | |
| 240 | |
| 241 case VOC_DATA_16: | |
| 242 if (SDL_RWread(src, &new_rate_long, sizeof (new_rate_long), 1) != 1) | |
| 243 return 0; | |
| 244 new_rate_long = SDL_SwapLE32(new_rate_long); | |
| 245 if (new_rate_long == 0) | |
| 246 { | |
| 247 Sound_SetError("VOC Sample rate is zero?"); | |
| 248 return 0; | |
| 249 } | |
| 250 if ((v->rate != -1) && (new_rate_long != v->rate)) | |
| 251 { | |
| 252 Sound_SetError("VOC sample rate codes differ"); | |
| 253 return 0; | |
| 254 } | |
| 255 v->rate = new_rate_long; | |
| 256 sample->actual.rate = new_rate_long; | |
| 257 | |
| 258 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 259 return 0; | |
| 260 | |
| 261 switch (uc) | |
| 262 { | |
| 263 case 8: v->size = ST_SIZE_BYTE; break; | |
| 264 case 16: v->size = ST_SIZE_WORD; break; | |
| 265 default: | |
| 266 Sound_SetError("VOC with unknown data size"); | |
| 267 return 0; | |
| 268 } | |
| 269 | |
| 270 if (SDL_RWread(src, &v->channels, sizeof (Uint8), 1) != 1) | |
| 271 return 0; | |
| 272 | |
| 273 if (SDL_RWread(src, trash, sizeof (Uint8), 6) != 6) | |
| 274 return 0; | |
| 275 | |
| 276 v->rest = sblen - 12; | |
| 277 return 1; | |
| 278 | |
| 279 case VOC_CONT: | |
| 280 v->rest = sblen; | |
| 281 return 1; | |
| 282 | |
| 283 case VOC_SILENCE: | |
| 284 if (SDL_RWread(src, &period, sizeof (period), 1) != 1) | |
| 285 return 0; | |
| 286 period = SDL_SwapLE16(period); | |
| 287 | |
| 288 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 289 return 0; | |
| 290 if (uc == 0) | |
| 291 { | |
| 292 Sound_SetError("VOC silence sample rate is zero"); | |
| 293 return 0; | |
| 294 } | |
| 295 | |
| 296 /* | |
| 297 * Some silence-packed files have gratuitously | |
| 298 * different sample rate codes in silence. | |
| 299 * Adjust period. | |
| 300 */ | |
| 301 if ((v->rate != -1) && (uc != v->rate)) | |
| 302 period = (period * (256 - uc))/(256 - v->rate); | |
| 303 else | |
| 304 v->rate = uc; | |
| 305 v->rest = period; | |
| 306 v->silent = 1; | |
| 307 return 1; | |
| 308 | |
| 309 case VOC_LOOP: | |
| 310 case VOC_LOOPEND: | |
| 311 for(i = 0; i < sblen; i++) /* skip repeat loops. */ | |
| 312 { | |
| 313 if (SDL_RWread(src, trash, sizeof (Uint8), 1) != 1) | |
| 314 return 0; | |
| 315 } | |
| 316 break; | |
| 317 | |
| 318 case VOC_EXTENDED: | |
| 319 /* An Extended block is followed by a data block */ | |
| 320 /* Set this byte so we know to use the rate */ | |
| 321 /* value from the extended block and not the */ | |
| 322 /* data block. */ | |
| 323 v->extended = 1; | |
| 324 if (SDL_RWread(src, &new_rate_short, sizeof (new_rate_short), 1) != 1) | |
| 325 return 0; | |
| 326 new_rate_short = SDL_SwapLE16(new_rate_short); | |
| 327 if (new_rate_short == 0) | |
| 328 { | |
| 329 Sound_SetError("VOC sample rate is zero"); | |
| 330 return 0; | |
| 331 } | |
| 332 if ((v->rate != -1) && (new_rate_short != v->rate)) | |
| 333 { | |
| 334 Sound_SetError("VOC sample rate codes differ"); | |
| 335 return 0; | |
| 336 } | |
| 337 v->rate = new_rate_short; | |
| 338 | |
| 339 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 340 return 0; | |
| 341 | |
| 342 if (uc != 0) | |
| 343 { | |
| 344 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 345 return 0; | |
| 346 } | |
| 347 | |
| 348 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 349 return 0; | |
| 350 | |
| 351 if (uc) | |
| 352 sample->actual.channels = 2; /* Stereo */ | |
| 353 /* Needed number of channels before finishing | |
| 354 compute for rate */ | |
| 355 sample->actual.rate = | |
| 356 (256000000L/(65536L - v->rate)) / sample->actual.channels; | |
| 357 /* An extended block must be followed by a data */ | |
| 358 /* block to be valid so loop back to top so it */ | |
| 359 /* can be grabed. */ | |
| 360 continue; | |
| 361 | |
| 362 case VOC_MARKER: | |
| 363 if (SDL_RWread(src, trash, sizeof (Uint8), 2) != 2) | |
| 364 return 0; | |
| 365 | |
| 366 /* Falling! Falling! */ | |
| 367 | |
| 368 default: /* text block or other krapola. */ | |
| 369 for(i = 0; i < sblen; i++) | |
| 370 { | |
| 371 if (SDL_RWread(src, &trash, sizeof (Uint8), 1) != 1) | |
| 372 return 0; | |
| 373 } | |
| 374 | |
| 375 if (block == VOC_TEXT) | |
| 376 continue; /* get next block */ | |
| 377 } | |
| 378 } | |
| 379 | |
| 380 return 1; | |
| 381 } | |
| 382 | |
| 383 | |
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384 static int voc_read_waveform(Sound_Sample *sample) |
| 14 | 385 { |
| 386 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 387 SDL_RWops *src = internal->rw; | |
| 388 vs_t *v = (vs_t *) internal->decoder_private; | |
| 389 int done = 0; | |
| 390 Uint8 silence = 0x80; | |
| 391 Uint8 *buf = internal->buffer; | |
| 392 | |
| 393 if (v->rest == 0) | |
| 394 { | |
| 395 if (!voc_get_block(sample)) | |
| 396 return 0; | |
| 397 } | |
| 398 | |
| 399 if (v->rest == 0) | |
| 400 return 0; | |
| 401 | |
| 402 if (v->silent) | |
| 403 { | |
| 404 if (v->size == ST_SIZE_WORD) | |
| 405 silence = 0x00; | |
| 406 | |
| 407 /* Fill in silence */ | |
| 408 memset(buf, silence, v->rest); | |
| 409 done = v->rest; | |
| 410 v->rest = 0; | |
| 411 } | |
| 412 | |
| 413 else | |
| 414 { | |
| 415 Uint32 max = (v->rest < internal->buffer_size) ? | |
| 416 v->rest : internal->buffer_size; | |
| 417 done = SDL_RWread(src, buf + v->bufpos, 1, max); | |
| 418 v->rest -= done; | |
| 419 v->bufpos += done; | |
| 420 } | |
| 421 | |
| 422 return done; | |
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423 } /* voc_read_waveform */ |
| 14 | 424 |
| 425 | |
| 426 static int VOC_open(Sound_Sample *sample, const char *ext) | |
| 427 { | |
| 428 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 429 vs_t *v = NULL; | |
| 430 | |
| 431 if (!voc_check_header(internal->rw)) | |
| 432 return(0); | |
| 433 | |
| 434 v = (vs_t *) malloc(sizeof (vs_t)); | |
| 435 BAIL_IF_MACRO(v == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 436 memset(v, '\0', sizeof (vs_t)); | |
| 437 internal->decoder_private = v; | |
| 438 | |
|
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439 v->start_pos = SDL_RWtell(internal->rw); |
| 14 | 440 v->rate = -1; |
| 441 if (!voc_get_block(sample)) | |
| 442 { | |
| 443 free(v); | |
| 444 return(0); | |
| 445 } /* if */ | |
| 446 | |
| 447 if (v->rate == -1) | |
| 448 { | |
| 449 Sound_SetError("VOC data had no sound!"); | |
| 450 free(v); | |
| 451 return(0); | |
| 452 } /* if */ | |
| 453 | |
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454 SNDDBG(("VOC: Accepting data stream.\n")); |
| 14 | 455 sample->actual.format = (v->size == ST_SIZE_WORD) ? AUDIO_S16LSB:AUDIO_U8; |
| 456 sample->actual.channels = v->channels; | |
| 457 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 458 return(1); | |
| 459 } /* VOC_open */ | |
| 460 | |
| 461 | |
| 462 static void VOC_close(Sound_Sample *sample) | |
| 463 { | |
| 464 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 465 free(internal->decoder_private); | |
| 466 } /* VOC_close */ | |
| 467 | |
| 468 | |
| 469 static Uint32 VOC_read(Sound_Sample *sample) | |
| 470 { | |
| 471 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 472 vs_t *v = (vs_t *) internal->decoder_private; | |
| 473 | |
| 474 v->bufpos = 0; | |
| 475 while (v->bufpos < internal->buffer_size) | |
| 476 { | |
|
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477 Uint32 rc = voc_read_waveform(sample); |
| 14 | 478 if (rc == 0) /* !!! FIXME: Could be an error... */ |
| 479 { | |
| 480 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 481 break; | |
| 482 } /* if */ | |
| 483 | |
| 484 if (!voc_get_block(sample)) | |
| 485 { | |
| 486 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 487 break; | |
| 488 } /* if */ | |
| 489 } /* while */ | |
| 490 | |
| 491 return(v->bufpos); | |
| 492 } /* VOC_read */ | |
| 493 | |
|
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494 |
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495 static int VOC_rewind(Sound_Sample *sample) |
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496 { |
|
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497 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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498 vs_t *v = (vs_t *) internal->decoder_private; |
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499 int rc = SDL_RWseek(internal->rw, v->start_pos, SEEK_SET); |
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500 BAIL_IF_MACRO(rc != v->start_pos, ERR_IO_ERROR, 0); |
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501 v->rest = 0; |
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502 return(1); |
|
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503 } /* VOC_rewind */ |
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504 |
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505 #endif /* SOUND_SUPPORTS_VOC */ |
| 14 | 506 |
| 507 /* end of voc.c ... */ |