Mercurial > SDL_sound_CoreAudio
annotate decoders/voc.c @ 120:bd224f22e6b2
Handles sample rate somewhat more robustly.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 08 Oct 2001 01:40:42 +0000 |
| parents | dd95a12539fd |
| children | 1df5c106504e |
| 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 * | |
| 35 * Please see the file LICENSE in the source's root directory. | |
| 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); | |
| 61 | |
| 62 const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC = | |
| 63 { | |
| 64 { | |
| 65 "VOC", | |
| 66 "Creative Labs Voice format", | |
| 67 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 68 "http://www.icculus.org/SDL_sound/" | |
| 69 }, | |
| 70 | |
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71 VOC_init, /* init() method */ |
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72 VOC_quit, /* quit() method */ |
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73 VOC_open, /* open() method */ |
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74 VOC_close, /* close() method */ |
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75 VOC_read /* read() method */ |
| 14 | 76 }; |
| 77 | |
| 78 | |
| 79 /* Private data for VOC file */ | |
| 80 typedef struct vocstuff { | |
| 81 Uint32 rest; /* bytes remaining in current block */ | |
| 82 Uint32 rate; /* rate code (byte) of this chunk */ | |
| 83 int silent; /* sound or silence? */ | |
| 84 Uint32 srate; /* rate code (byte) of silence */ | |
| 85 Uint32 blockseek; /* start of current output block */ | |
| 86 Uint32 samples; /* number of samples output */ | |
| 87 Uint32 size; /* word length of data */ | |
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88 Uint8 channels; /* number of sound channels */ |
| 14 | 89 int extended; /* Has an extended block been read? */ |
| 90 Uint32 bufpos; /* byte position in internal->buffer. */ | |
| 91 } vs_t; | |
| 92 | |
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93 /* Size field */ |
| 14 | 94 /* SJB: note that the 1st 3 are sometimes used as sizeof(type) */ |
| 95 #define ST_SIZE_BYTE 1 | |
| 96 #define ST_SIZE_8BIT 1 | |
| 97 #define ST_SIZE_WORD 2 | |
| 98 #define ST_SIZE_16BIT 2 | |
| 99 #define ST_SIZE_DWORD 4 | |
| 100 #define ST_SIZE_32BIT 4 | |
| 101 #define ST_SIZE_FLOAT 5 | |
| 102 #define ST_SIZE_DOUBLE 6 | |
| 103 #define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */ | |
| 104 | |
| 105 /* Style field */ | |
| 106 #define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */ | |
| 107 #define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */ | |
| 108 #define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */ | |
| 109 #define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */ | |
| 110 #define ST_ENCODING_ADPCM 5 /* Compressed PCM */ | |
| 111 #define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */ | |
| 112 #define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */ | |
| 113 | |
| 114 #define VOC_TERM 0 | |
| 115 #define VOC_DATA 1 | |
| 116 #define VOC_CONT 2 | |
| 117 #define VOC_SILENCE 3 | |
| 118 #define VOC_MARKER 4 | |
| 119 #define VOC_TEXT 5 | |
| 120 #define VOC_LOOP 6 | |
| 121 #define VOC_LOOPEND 7 | |
| 122 #define VOC_EXTENDED 8 | |
| 123 #define VOC_DATA_16 9 | |
| 124 | |
| 125 | |
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126 static int VOC_init(void) |
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127 { |
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128 return(1); /* always succeeds. */ |
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129 } /* VOC_init */ |
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130 |
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131 |
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132 static void VOC_quit(void) |
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133 { |
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134 /* it's a no-op. */ |
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135 } /* VOC_quit */ |
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136 |
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137 |
| 14 | 138 static __inline__ int voc_check_header(SDL_RWops *src) |
| 139 { | |
| 140 /* VOC magic header */ | |
| 141 Uint8 signature[20]; /* "Creative Voice File\032" */ | |
| 142 Uint16 datablockofs; | |
| 143 | |
| 144 if (SDL_RWread(src, signature, sizeof (signature), 1) != 1) | |
| 145 return(0); | |
| 146 | |
| 147 if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) { | |
| 148 Sound_SetError("Unrecognized file type (not VOC)"); | |
| 149 return(0); | |
| 150 } | |
| 151 | |
| 152 /* get the offset where the first datablock is located */ | |
| 153 if (SDL_RWread(src, &datablockofs, sizeof (Uint16), 1) != 1) | |
| 154 return(0); | |
| 155 | |
| 156 datablockofs = SDL_SwapLE16(datablockofs); | |
| 157 | |
| 158 if (SDL_RWseek(src, datablockofs, SEEK_SET) != datablockofs) | |
| 159 return(0); | |
| 160 | |
| 161 return(1); /* success! */ | |
| 162 } /* voc_check_header */ | |
| 163 | |
| 164 /* !!! FIXME : Add a flag to vs_t that distinguishes EOF and Error conditions. */ | |
| 165 | |
| 166 /* Read next block header, save info, leave position at start of data */ | |
| 167 static int voc_get_block(Sound_Sample *sample) | |
| 168 { | |
| 169 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 170 SDL_RWops *src = internal->rw; | |
| 171 vs_t *v = (vs_t *) internal->decoder_private; | |
| 172 Uint8 bits24[3]; | |
| 173 Uint8 uc, block; | |
| 174 Uint32 sblen; | |
| 175 Uint16 new_rate_short; | |
| 176 Uint32 new_rate_long; | |
| 177 Uint8 trash[6]; | |
| 178 Uint16 period; | |
| 179 int i; | |
| 180 | |
| 181 v->silent = 0; | |
| 182 while (v->rest == 0) | |
| 183 { | |
| 184 if (SDL_RWread(src, &block, sizeof (block), 1) != 1) | |
| 185 return 1; /* assume that's the end of the file. */ | |
| 186 | |
| 187 if (block == VOC_TERM) | |
| 188 return 1; | |
| 189 | |
| 190 if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1) | |
| 191 return 1; /* assume that's the end of the file. */ | |
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192 |
| 14 | 193 /* Size is an 24-bit value. Ugh. */ |
| 194 sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) ); | |
| 195 | |
| 196 switch(block) | |
| 197 { | |
| 198 case VOC_DATA: | |
| 199 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 200 return 0; | |
| 201 | |
| 202 /* When DATA block preceeded by an EXTENDED */ | |
| 203 /* block, the DATA blocks rate value is invalid */ | |
| 204 if (!v->extended) | |
| 205 { | |
| 206 if (uc == 0) | |
| 207 { | |
| 208 Sound_SetError("VOC Sample rate is zero?"); | |
| 209 return 0; | |
| 210 } | |
| 211 | |
| 212 if ((v->rate != -1) && (uc != v->rate)) | |
| 213 { | |
| 214 Sound_SetError("VOC sample rate codes differ"); | |
| 215 return 0; | |
| 216 } | |
| 217 | |
| 218 v->rate = uc; | |
| 219 sample->actual.rate = 1000000.0/(256 - v->rate); | |
| 220 v->channels = 1; | |
| 221 } | |
| 222 | |
| 223 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 224 return 0; | |
| 225 | |
| 226 if (uc != 0) | |
| 227 { | |
| 228 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 229 return 0; | |
| 230 } | |
| 231 | |
| 232 v->extended = 0; | |
| 233 v->rest = sblen - 2; | |
| 234 v->size = ST_SIZE_BYTE; | |
| 235 return 1; | |
| 236 | |
| 237 case VOC_DATA_16: | |
| 238 if (SDL_RWread(src, &new_rate_long, sizeof (new_rate_long), 1) != 1) | |
| 239 return 0; | |
| 240 new_rate_long = SDL_SwapLE32(new_rate_long); | |
| 241 if (new_rate_long == 0) | |
| 242 { | |
| 243 Sound_SetError("VOC Sample rate is zero?"); | |
| 244 return 0; | |
| 245 } | |
| 246 if ((v->rate != -1) && (new_rate_long != v->rate)) | |
| 247 { | |
| 248 Sound_SetError("VOC sample rate codes differ"); | |
| 249 return 0; | |
| 250 } | |
| 251 v->rate = new_rate_long; | |
| 252 sample->actual.rate = new_rate_long; | |
| 253 | |
| 254 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 255 return 0; | |
| 256 | |
| 257 switch (uc) | |
| 258 { | |
| 259 case 8: v->size = ST_SIZE_BYTE; break; | |
| 260 case 16: v->size = ST_SIZE_WORD; break; | |
| 261 default: | |
| 262 Sound_SetError("VOC with unknown data size"); | |
| 263 return 0; | |
| 264 } | |
| 265 | |
| 266 if (SDL_RWread(src, &v->channels, sizeof (Uint8), 1) != 1) | |
| 267 return 0; | |
| 268 | |
| 269 if (SDL_RWread(src, trash, sizeof (Uint8), 6) != 6) | |
| 270 return 0; | |
| 271 | |
| 272 v->rest = sblen - 12; | |
| 273 return 1; | |
| 274 | |
| 275 case VOC_CONT: | |
| 276 v->rest = sblen; | |
| 277 return 1; | |
| 278 | |
| 279 case VOC_SILENCE: | |
| 280 if (SDL_RWread(src, &period, sizeof (period), 1) != 1) | |
| 281 return 0; | |
| 282 period = SDL_SwapLE16(period); | |
| 283 | |
| 284 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 285 return 0; | |
| 286 if (uc == 0) | |
| 287 { | |
| 288 Sound_SetError("VOC silence sample rate is zero"); | |
| 289 return 0; | |
| 290 } | |
| 291 | |
| 292 /* | |
| 293 * Some silence-packed files have gratuitously | |
| 294 * different sample rate codes in silence. | |
| 295 * Adjust period. | |
| 296 */ | |
| 297 if ((v->rate != -1) && (uc != v->rate)) | |
| 298 period = (period * (256 - uc))/(256 - v->rate); | |
| 299 else | |
| 300 v->rate = uc; | |
| 301 v->rest = period; | |
| 302 v->silent = 1; | |
| 303 return 1; | |
| 304 | |
| 305 case VOC_LOOP: | |
| 306 case VOC_LOOPEND: | |
| 307 for(i = 0; i < sblen; i++) /* skip repeat loops. */ | |
| 308 { | |
| 309 if (SDL_RWread(src, trash, sizeof (Uint8), 1) != 1) | |
| 310 return 0; | |
| 311 } | |
| 312 break; | |
| 313 | |
| 314 case VOC_EXTENDED: | |
| 315 /* An Extended block is followed by a data block */ | |
| 316 /* Set this byte so we know to use the rate */ | |
| 317 /* value from the extended block and not the */ | |
| 318 /* data block. */ | |
| 319 v->extended = 1; | |
| 320 if (SDL_RWread(src, &new_rate_short, sizeof (new_rate_short), 1) != 1) | |
| 321 return 0; | |
| 322 new_rate_short = SDL_SwapLE16(new_rate_short); | |
| 323 if (new_rate_short == 0) | |
| 324 { | |
| 325 Sound_SetError("VOC sample rate is zero"); | |
| 326 return 0; | |
| 327 } | |
| 328 if ((v->rate != -1) && (new_rate_short != v->rate)) | |
| 329 { | |
| 330 Sound_SetError("VOC sample rate codes differ"); | |
| 331 return 0; | |
| 332 } | |
| 333 v->rate = new_rate_short; | |
| 334 | |
| 335 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 336 return 0; | |
| 337 | |
| 338 if (uc != 0) | |
| 339 { | |
| 340 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 341 return 0; | |
| 342 } | |
| 343 | |
| 344 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 345 return 0; | |
| 346 | |
| 347 if (uc) | |
| 348 sample->actual.channels = 2; /* Stereo */ | |
| 349 /* Needed number of channels before finishing | |
| 350 compute for rate */ | |
| 351 sample->actual.rate = | |
| 352 (256000000L/(65536L - v->rate)) / sample->actual.channels; | |
| 353 /* An extended block must be followed by a data */ | |
| 354 /* block to be valid so loop back to top so it */ | |
| 355 /* can be grabed. */ | |
| 356 continue; | |
| 357 | |
| 358 case VOC_MARKER: | |
| 359 if (SDL_RWread(src, trash, sizeof (Uint8), 2) != 2) | |
| 360 return 0; | |
| 361 | |
| 362 /* Falling! Falling! */ | |
| 363 | |
| 364 default: /* text block or other krapola. */ | |
| 365 for(i = 0; i < sblen; i++) | |
| 366 { | |
| 367 if (SDL_RWread(src, &trash, sizeof (Uint8), 1) != 1) | |
| 368 return 0; | |
| 369 } | |
| 370 | |
| 371 if (block == VOC_TEXT) | |
| 372 continue; /* get next block */ | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 return 1; | |
| 377 } | |
| 378 | |
| 379 | |
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380 static int voc_read_waveform(Sound_Sample *sample) |
| 14 | 381 { |
| 382 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 383 SDL_RWops *src = internal->rw; | |
| 384 vs_t *v = (vs_t *) internal->decoder_private; | |
| 385 int done = 0; | |
| 386 Uint8 silence = 0x80; | |
| 387 Uint8 *buf = internal->buffer; | |
| 388 | |
| 389 if (v->rest == 0) | |
| 390 { | |
| 391 if (!voc_get_block(sample)) | |
| 392 return 0; | |
| 393 } | |
| 394 | |
| 395 if (v->rest == 0) | |
| 396 return 0; | |
| 397 | |
| 398 if (v->silent) | |
| 399 { | |
| 400 if (v->size == ST_SIZE_WORD) | |
| 401 silence = 0x00; | |
| 402 | |
| 403 /* Fill in silence */ | |
| 404 memset(buf, silence, v->rest); | |
| 405 done = v->rest; | |
| 406 v->rest = 0; | |
| 407 } | |
| 408 | |
| 409 else | |
| 410 { | |
| 411 Uint32 max = (v->rest < internal->buffer_size) ? | |
| 412 v->rest : internal->buffer_size; | |
| 413 done = SDL_RWread(src, buf + v->bufpos, 1, max); | |
| 414 v->rest -= done; | |
| 415 v->bufpos += done; | |
| 416 } | |
| 417 | |
| 418 return done; | |
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419 } /* voc_read_waveform */ |
| 14 | 420 |
| 421 | |
| 422 static int VOC_open(Sound_Sample *sample, const char *ext) | |
| 423 { | |
| 424 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 425 vs_t *v = NULL; | |
| 426 | |
| 427 if (!voc_check_header(internal->rw)) | |
| 428 return(0); | |
| 429 | |
| 430 v = (vs_t *) malloc(sizeof (vs_t)); | |
| 431 BAIL_IF_MACRO(v == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 432 memset(v, '\0', sizeof (vs_t)); | |
| 433 internal->decoder_private = v; | |
| 434 | |
| 435 v->rate = -1; | |
| 436 if (!voc_get_block(sample)) | |
| 437 { | |
| 438 free(v); | |
| 439 return(0); | |
| 440 } /* if */ | |
| 441 | |
| 442 if (v->rate == -1) | |
| 443 { | |
| 444 Sound_SetError("VOC data had no sound!"); | |
| 445 free(v); | |
| 446 return(0); | |
| 447 } /* if */ | |
| 448 | |
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|
449 SNDDBG(("VOC: Accepting data stream.\n")); |
| 14 | 450 sample->actual.format = (v->size == ST_SIZE_WORD) ? AUDIO_S16LSB:AUDIO_U8; |
| 451 sample->actual.channels = v->channels; | |
| 452 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 453 return(1); | |
| 454 } /* VOC_open */ | |
| 455 | |
| 456 | |
| 457 static void VOC_close(Sound_Sample *sample) | |
| 458 { | |
| 459 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 460 free(internal->decoder_private); | |
| 461 } /* VOC_close */ | |
| 462 | |
| 463 | |
| 464 static Uint32 VOC_read(Sound_Sample *sample) | |
| 465 { | |
| 466 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 467 vs_t *v = (vs_t *) internal->decoder_private; | |
| 468 | |
| 469 v->bufpos = 0; | |
| 470 while (v->bufpos < internal->buffer_size) | |
| 471 { | |
|
22
f6e679afe88b
Byte ordering fix, changed voc_read to voc_read_waveform, and cleaned up
Ryan C. Gordon <icculus@icculus.org>
parents:
14
diff
changeset
|
472 Uint32 rc = voc_read_waveform(sample); |
| 14 | 473 if (rc == 0) /* !!! FIXME: Could be an error... */ |
| 474 { | |
| 475 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 476 break; | |
| 477 } /* if */ | |
| 478 | |
| 479 if (!voc_get_block(sample)) | |
| 480 { | |
| 481 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 482 break; | |
| 483 } /* if */ | |
| 484 } /* while */ | |
| 485 | |
| 486 return(v->bufpos); | |
| 487 } /* VOC_read */ | |
| 488 | |
|
64
40006625142a
Changes in preparation of autoconf support.
Ryan C. Gordon <icculus@icculus.org>
parents:
62
diff
changeset
|
489 #endif /* SOUND_SUPPORTS_VOC */ |
| 14 | 490 |
| 491 /* end of voc.c ... */ |